diff options
Diffstat (limited to 'drivers/staging/iio/adc')
| -rw-r--r-- | drivers/staging/iio/adc/Kconfig | 35 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/Makefile | 11 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298.c | 501 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298.h | 80 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298_core.c | 287 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298_ring.c | 258 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7476.h | 1 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7476_core.c | 2 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7476_ring.c | 37 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7606.h | 117 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7606_core.c | 556 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7606_par.c | 188 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7606_ring.c | 280 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7606_spi.c | 126 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7887.h | 1 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7887_ring.c | 36 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad799x.h | 1 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad799x_core.c | 12 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad799x_ring.c | 43 |
19 files changed, 2010 insertions, 562 deletions
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 86869cd233ae..6692a3d87f23 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -49,11 +49,14 @@ config AD7291 temperature sensors. config AD7298 - tristate "Analog Devices AD7298 temperature sensor and ADC driver" + tristate "Analog Devices AD7298 ADC driver" depends on SPI help Say yes here to build support for Analog Devices AD7298 - temperature sensors and ADC. + 8 Channel ADC with temperature sensor. + + To compile this driver as a module, choose M here: the + module will be called ad7298. config AD7314 tristate "Analog Devices AD7314 temperature sensor driver" @@ -62,6 +65,34 @@ config AD7314 Say yes here to build support for Analog Devices AD7314 temperature sensors. +config AD7606 + tristate "Analog Devices AD7606 ADC driver" + depends on GPIOLIB + select IIO_RING_BUFFER + select IIO_TRIGGER + select IIO_SW_RING + help + Say yes here to build support for Analog Devices: + ad7606, ad7606-6, ad7606-4 analog to digital convertors (ADC). + + To compile this driver as a module, choose M here: the + module will be called ad7606. + +config AD7606_IFACE_PARALLEL + tristate "parallel interface support" + depends on AD7606 + help + Say yes here to include parallel interface support on the AD7606 + ADC driver. + +config AD7606_IFACE_SPI + tristate "spi interface support" + depends on AD7606 + depends on SPI + help + Say yes here to include parallel interface support on the AD7606 + ADC driver. + config AD799X tristate "Analog Devices AD799x ADC driver" depends on I2C diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 6f231a2cb777..31067defd79b 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -7,6 +7,12 @@ max1363-y += max1363_ring.o obj-$(CONFIG_MAX1363) += max1363.o +ad7606-y := ad7606_core.o +ad7606-$(CONFIG_IIO_RING_BUFFER) += ad7606_ring.o +ad7606-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o +ad7606-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o +obj-$(CONFIG_AD7606) += ad7606.o + ad799x-y := ad799x_core.o ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o obj-$(CONFIG_AD799X) += ad799x.o @@ -19,10 +25,13 @@ ad7887-y := ad7887_core.o ad7887-$(CONFIG_IIO_RING_BUFFER) += ad7887_ring.o obj-$(CONFIG_AD7887) += ad7887.o +ad7298-y := ad7298_core.o +ad7298-$(CONFIG_IIO_RING_BUFFER) += ad7298_ring.o +obj-$(CONFIG_AD7298) += ad7298.o + obj-$(CONFIG_AD7150) += ad7150.o obj-$(CONFIG_AD7152) += ad7152.o obj-$(CONFIG_AD7291) += ad7291.o -obj-$(CONFIG_AD7298) += ad7298.o obj-$(CONFIG_AD7314) += ad7314.o obj-$(CONFIG_AD7745) += ad7745.o obj-$(CONFIG_AD7816) += ad7816.o diff --git a/drivers/staging/iio/adc/ad7298.c b/drivers/staging/iio/adc/ad7298.c deleted file mode 100644 index 1a080c977637..000000000000 --- a/drivers/staging/iio/adc/ad7298.c +++ /dev/null @@ -1,501 +0,0 @@ -/* - * AD7298 digital temperature sensor driver supporting AD7298 - * - * Copyright 2010 Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/interrupt.h> -#include <linux/gpio.h> -#include <linux/workqueue.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/list.h> -#include <linux/spi/spi.h> -#include <linux/rtc.h> - -#include "../iio.h" -#include "../sysfs.h" - -/* - * AD7298 command - */ -#define AD7298_PD 0x1 -#define AD7298_T_AVG_MASK 0x2 -#define AD7298_EXT_REF 0x4 -#define AD7298_T_SENSE_MASK 0x20 -#define AD7298_VOLTAGE_MASK 0x3fc0 -#define AD7298_VOLTAGE_OFFSET 0x6 -#define AD7298_VOLTAGE_LIMIT_COUNT 8 -#define AD7298_REPEAT 0x40 -#define AD7298_WRITE 0x80 - -/* - * AD7298 value masks - */ -#define AD7298_CHANNEL_MASK 0xf000 -#define AD7298_VALUE_MASK 0xfff -#define AD7298_T_VALUE_SIGN 0x400 -#define AD7298_T_VALUE_FLOAT_OFFSET 2 -#define AD7298_T_VALUE_FLOAT_MASK 0x2 - -/* - * struct ad7298_chip_info - chip specifc information - */ - -struct ad7298_chip_info { - const char *name; - struct spi_device *spi_dev; - struct iio_dev *indio_dev; - u16 command; - u16 busy_pin; - u8 channels; /* Active voltage channels */ -}; - -/* - * ad7298 register access by SPI - */ -static int ad7298_spi_write(struct ad7298_chip_info *chip, u16 data) -{ - struct spi_device *spi_dev = chip->spi_dev; - int ret = 0; - - data |= AD7298_WRITE; - data = cpu_to_be16(data); - ret = spi_write(spi_dev, (u8 *)&data, sizeof(data)); - if (ret < 0) - dev_err(&spi_dev->dev, "SPI write error\n"); - - return ret; -} - -static int ad7298_spi_read(struct ad7298_chip_info *chip, u16 mask, u16 *data) -{ - struct spi_device *spi_dev = chip->spi_dev; - int ret = 0; - u8 count = chip->channels; - u16 command; - int i; - - if (mask & AD7298_T_SENSE_MASK) { - command = chip->command & ~(AD7298_T_AVG_MASK | AD7298_VOLTAGE_MASK); - command |= AD7298_T_SENSE_MASK; - count = 1; - } else if (mask & AD7298_T_AVG_MASK) { - command = chip->command & ~AD7298_VOLTAGE_MASK; - command |= AD7298_T_SENSE_MASK | AD7298_T_AVG_MASK; - count = 2; - } else if (mask & AD7298_VOLTAGE_MASK) { - command = chip->command & ~(AD7298_T_AVG_MASK | AD7298_T_SENSE_MASK); - count = chip->channels; - } - - ret = ad7298_spi_write(chip, chip->command); - if (ret < 0) { - dev_err(&spi_dev->dev, "SPI write command error\n"); - return ret; - } - - ret = spi_read(spi_dev, (u8 *)&command, sizeof(command)); - if (ret < 0) { - dev_err(&spi_dev->dev, "SPI read error\n"); - return ret; - } - - i = 10000; - while (i && gpio_get_value(chip->busy_pin)) { - cpu_relax(); - i--; - } - if (!i) { - dev_err(&spi_dev->dev, "Always in busy convertion.\n"); - return -EBUSY; - } - - for (i = 0; i < count; i++) { - ret = spi_read(spi_dev, (u8 *)&data[i], sizeof(data[i])); - if (ret < 0) { - dev_err(&spi_dev->dev, "SPI read error\n"); - return ret; - } - *data = be16_to_cpu(data[i]); - } - - return 0; -} - -static ssize_t ad7298_show_mode(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - - if (chip->command & AD7298_REPEAT) - return sprintf(buf, "repeat\n"); - else - return sprintf(buf, "normal\n"); -} - -static ssize_t ad7298_store_mode(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - - if (strcmp(buf, "repeat")) - chip->command |= AD7298_REPEAT; - else - chip->command &= (~AD7298_REPEAT); - - return 1; -} - -static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, - ad7298_show_mode, - ad7298_store_mode, - 0); - -static ssize_t ad7298_show_available_modes(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - return sprintf(buf, "normal\nrepeat\n"); -} - -static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7298_show_available_modes, NULL, 0); - -static ssize_t ad7298_store_reset(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - u16 command; - int ret; - - command = chip->command & ~AD7298_PD; - - ret = ad7298_spi_write(chip, command); - if (ret) - return -EIO; - - command = chip->command | AD7298_PD; - - ret = ad7298_spi_write(chip, command); - if (ret) - return -EIO; - - return len; -} - -static IIO_DEVICE_ATTR(reset, S_IWUSR, - NULL, - ad7298_store_reset, - 0); - -static ssize_t ad7298_show_ext_ref(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - - return sprintf(buf, "%d\n", !!(chip->command & AD7298_EXT_REF)); -} - -static ssize_t ad7298_store_ext_ref(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - u16 command; - int ret; - - command = chip->command & (~AD7298_EXT_REF); - if (strcmp(buf, "1")) - command |= AD7298_EXT_REF; - - ret = ad7298_spi_write(chip, command); - if (ret) - return -EIO; - - chip->command = command; - - return len; -} - -static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR, - ad7298_show_ext_ref, - ad7298_store_ext_ref, - 0); - -static ssize_t ad7298_show_t_sense(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - u16 data; - char sign = ' '; - int ret; - - ret = ad7298_spi_read(chip, AD7298_T_SENSE_MASK, &data); - if (ret) - return -EIO; - - if (data & AD7298_T_VALUE_SIGN) { - /* convert supplement to positive value */ - data = (AD7298_T_VALUE_SIGN << 1) - data; - sign = '-'; - } - - return sprintf(buf, "%c%d.%.2d\n", sign, - (data >> AD7298_T_VALUE_FLOAT_OFFSET), - (data & AD7298_T_VALUE_FLOAT_MASK) * 25); -} - -static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7298_show_t_sense, NULL, 0); - -static ssize_t ad7298_show_t_average(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - u16 data[2]; - char sign = ' '; - int ret; - - ret = ad7298_spi_read(chip, AD7298_T_AVG_MASK, data); - if (ret) - return -EIO; - - if (data[1] & AD7298_T_VALUE_SIGN) { - /* convert supplement to positive value */ - data[1] = (AD7298_T_VALUE_SIGN << 1) - data[1]; - sign = '-'; - } - - return sprintf(buf, "%c%d.%.2d\n", sign, - (data[1] >> AD7298_T_VALUE_FLOAT_OFFSET), - (data[1] & AD7298_T_VALUE_FLOAT_MASK) * 25); -} - -static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7298_show_t_average, NULL, 0); - -static ssize_t ad7298_show_voltage(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - u16 data[AD7298_VOLTAGE_LIMIT_COUNT]; - int i, size, ret; - - ret = ad7298_spi_read(chip, AD7298_VOLTAGE_MASK, data); - if (ret) - return -EIO; - - for (i = 0; i < AD7298_VOLTAGE_LIMIT_COUNT; i++) { - if (chip->command & (AD7298_T_SENSE_MASK << i)) { - ret = sprintf(buf, "channel[%d]=%d\n", i, - data[i] & AD7298_VALUE_MASK); - if (ret < 0) - break; - buf += ret; - size += ret; - } - } - - return size; -} - -static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7298_show_voltage, NULL, 0); - -static ssize_t ad7298_show_channel_mask(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - - return sprintf(buf, "0x%x\n", (chip->command & AD7298_VOLTAGE_MASK) >> - AD7298_VOLTAGE_OFFSET); -} - -static ssize_t ad7298_store_channel_mask(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - unsigned long data; - int i, ret; - - ret = strict_strtoul(buf, 16, &data); - if (ret || data > 0xff) - return -EINVAL; - - chip->command &= (~AD7298_VOLTAGE_MASK); - chip->command |= data << AD7298_VOLTAGE_OFFSET; - - for (i = 0, chip->channels = 0; i < AD7298_VOLTAGE_LIMIT_COUNT; i++) { - if (chip->command & (AD7298_T_SENSE_MASK << i)) - chip->channels++; - } - - return ret; -} - -static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR, - ad7298_show_channel_mask, - ad7298_store_channel_mask, - 0); - -static ssize_t ad7298_show_name(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad7298_chip_info *chip = dev_info->dev_data; - return sprintf(buf, "%s\n", chip->name); -} - -static IIO_DEVICE_ATTR(name, S_IRUGO, ad7298_show_name, NULL, 0); - -static struct attribute *ad7298_attributes[] = { - &iio_dev_attr_available_modes.dev_attr.attr, - &iio_dev_attr_mode.dev_attr.attr, - &iio_dev_attr_reset.dev_attr.attr, - &iio_dev_attr_ext_ref.dev_attr.attr, - &iio_dev_attr_t_sense.dev_attr.attr, - &iio_dev_attr_t_average.dev_attr.attr, - &iio_dev_attr_voltage.dev_attr.attr, - &iio_dev_attr_channel_mask.dev_attr.attr, - &iio_dev_attr_name.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad7298_attribute_group = { - .attrs = ad7298_attributes, -}; - -/* - * device probe and remove - */ -static int __devinit ad7298_probe(struct spi_device *spi_dev) -{ - struct ad7298_chip_info *chip; - unsigned short *pins = spi_dev->dev.platform_data; - int ret = 0; - - chip = kzalloc(sizeof(struct ad7298_chip_info), GFP_KERNEL); - - if (chip == NULL) - return -ENOMEM; - - /* this is only used for device removal purposes */ - dev_set_drvdata(&spi_dev->dev, chip); - - chip->spi_dev = spi_dev; - chip->name = spi_dev->modalias; - chip->busy_pin = pins[0]; - - ret = gpio_request(chip->busy_pin, chip->name); - if (ret) { - dev_err(&spi_dev->dev, "Fail to request busy gpio PIN %d.\n", - chip->busy_pin); - goto error_free_chip; - } - gpio_direction_input(chip->busy_pin); - - chip->indio_dev = iio_allocate_device(); - if (chip->indio_dev == NULL) { - ret = -ENOMEM; - goto error_free_gpio; - } - - chip->indio_dev->dev.parent = &spi_dev->dev; - chip->indio_dev->attrs = &ad7298_attribute_group; - chip->indio_dev->dev_data = (void *)chip; - chip->indio_dev->driver_module = THIS_MODULE; - chip->indio_dev->modes = INDIO_DIRECT_MODE; - - ret = iio_device_register(chip->indio_dev); - if (ret) - goto error_free_dev; - - dev_info(&spi_dev->dev, "%s temperature sensor and ADC registered.\n", - chip->name); - - return 0; - -error_free_dev: - iio_free_device(chip->indio_dev); -error_free_gpio: - gpio_free(chip->busy_pin); -error_free_chip: - kfree(chip); - - return ret; -} - -static int __devexit ad7298_remove(struct spi_device *spi_dev) -{ - struct ad7298_chip_info *chip = dev_get_drvdata(&spi_dev->dev); - struct iio_dev *indio_dev = chip->indio_dev; - - dev_set_drvdata(&spi_dev->dev, NULL); - iio_device_unregister(indio_dev); - iio_free_device(chip->indio_dev); - gpio_free(chip->busy_pin); - kfree(chip); - - return 0; -} - -static const struct spi_device_id ad7298_id[] = { - { "ad7298", 0 }, - {} -}; - -MODULE_DEVICE_TABLE(spi, ad7298_id); - -static struct spi_driver ad7298_driver = { - .driver = { - .name = "ad7298", - .bus = &spi_bus_type, - .owner = THIS_MODULE, - }, - .probe = ad7298_probe, - .remove = __devexit_p(ad7298_remove), - .id_table = ad7298_id, -}; - -static __init int ad7298_init(void) -{ - return spi_register_driver(&ad7298_driver); -} - -static __exit void ad7298_exit(void) -{ - spi_unregister_driver(&ad7298_driver); -} - -MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); -MODULE_DESCRIPTION("Analog Devices AD7298 digital" - " temperature sensor and ADC driver"); -MODULE_LICENSE("GPL v2"); - -module_init(ad7298_init); -module_exit(ad7298_exit); diff --git a/drivers/staging/iio/adc/ad7298.h b/drivers/staging/iio/adc/ad7298.h new file mode 100644 index 000000000000..fe7ed77d638f --- /dev/null +++ b/drivers/staging/iio/adc/ad7298.h @@ -0,0 +1,80 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef IIO_ADC_AD7298_H_ +#define IIO_ADC_AD7298_H_ + +#define AD7298_WRITE (1 << 15) /* write to the control register */ +#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */ +#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */ +#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */ +#define AD7298_EXTREF (1 << 2) /* external reference enable */ +#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */ +#define AD7298_PDD (1 << 0) /* partial power down enable */ + +#define AD7298_CH_MASK (AD7298_CH0 | AD7298_CH1 | AD7298_CH2 | AD7298_CH3 | \ + AD7298_CH4 | AD7298_CH5 | AD7298_CH6 | AD7298_CH7) + +#define AD7298_MAX_CHAN 8 +#define AD7298_BITS 12 +#define AD7298_STORAGE_BITS 16 +#define AD7298_INTREF_mV 2500 + +#define RES_MASK(bits) ((1 << (bits)) - 1) + +/* + * TODO: struct ad7298_platform_data needs to go into include/linux/iio + */ + +struct ad7298_platform_data { + /* External Vref voltage applied */ + u16 vref_mv; +}; + +struct ad7298_state { + struct iio_dev *indio_dev; + struct spi_device *spi; + struct regulator *reg; + struct work_struct poll_work; + atomic_t protect_ring; + size_t d_size; + u16 int_vref_mv; + unsigned ext_ref; + struct spi_transfer ring_xfer[10]; + struct spi_transfer scan_single_xfer[3]; + struct spi_message ring_msg; + struct spi_message scan_single_msg; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + unsigned short rx_buf[8] ____cacheline_aligned; + unsigned short tx_buf[2]; +}; + +#ifdef CONFIG_IIO_RING_BUFFER +int ad7298_scan_from_ring(struct ad7298_state *st, long ch); +int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev); +void ad7298_ring_cleanup(struct iio_dev *indio_dev); +#else /* CONFIG_IIO_RING_BUFFER */ +static inline int ad7298_scan_from_ring(struct ad7298_state *st, long ch) +{ + return 0; +} + +static inline int +ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + return 0; +} + +static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev) +{ +} +#endif /* CONFIG_IIO_RING_BUFFER */ +#endif /* IIO_ADC_AD7298_H_ */ diff --git a/drivers/staging/iio/adc/ad7298_core.c b/drivers/staging/iio/adc/ad7298_core.c new file mode 100644 index 000000000000..2e9154e7d887 --- /dev/null +++ b/drivers/staging/iio/adc/ad7298_core.c @@ -0,0 +1,287 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/delay.h> + +#include "../iio.h" +#include "../sysfs.h" +#include "../ring_generic.h" +#include "adc.h" + +#include "ad7298.h" + +static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch) +{ + int ret; + st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref | + (AD7298_CH(0) >> ch)); + + ret = spi_sync(st->spi, &st->scan_single_msg); + if (ret) + return ret; + + return be16_to_cpu(st->rx_buf[0]); +} + +static ssize_t ad7298_scan(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = dev_info->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int ret; + + mutex_lock(&dev_info->mlock); + if (iio_ring_enabled(dev_info)) + ret = ad7298_scan_from_ring(st, this_attr->address); + else + ret = ad7298_scan_direct(st, this_attr->address); + mutex_unlock(&dev_info->mlock); + + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", ret & RES_MASK(AD7298_BITS)); +} + +static IIO_DEV_ATTR_IN_RAW(0, ad7298_scan, 0); +static IIO_DEV_ATTR_IN_RAW(1, ad7298_scan, 1); +static IIO_DEV_ATTR_IN_RAW(2, ad7298_scan, 2); +static IIO_DEV_ATTR_IN_RAW(3, ad7298_scan, 3); +static IIO_DEV_ATTR_IN_RAW(4, ad7298_scan, 4); +static IIO_DEV_ATTR_IN_RAW(5, ad7298_scan, 5); +static IIO_DEV_ATTR_IN_RAW(6, ad7298_scan, 6); +static IIO_DEV_ATTR_IN_RAW(7, ad7298_scan, 7); + +static ssize_t ad7298_show_temp(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = iio_dev_get_devdata(dev_info); + int tmp; + + tmp = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE | + AD7298_TAVG | st->ext_ref); + + mutex_lock(&dev_info->mlock); + spi_write(st->spi, (u8 *)&tmp, 2); + tmp = 0; + spi_write(st->spi, (u8 *)&tmp, 2); + usleep_range(101, 1000); /* sleep > 100us */ + spi_read(st->spi, (u8 *)&tmp, 2); + mutex_unlock(&dev_info->mlock); + + tmp = be16_to_cpu(tmp) & RES_MASK(AD7298_BITS); + + /* + * One LSB of the ADC corresponds to 0.25 deg C. + * The temperature reading is in 12-bit twos complement format + */ + + if (tmp & (1 << (AD7298_BITS - 1))) { + tmp = (4096 - tmp) * 250; + tmp -= (2 * tmp); + + } else { + tmp *= 250; /* temperature in milli degrees Celsius */ + } + + return sprintf(buf, "%d\n", tmp); +} + +static IIO_DEVICE_ATTR(temp0_input, S_IRUGO, ad7298_show_temp, NULL, 0); + +static ssize_t ad7298_show_scale(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = iio_dev_get_devdata(dev_info); + /* Corresponds to Vref / 2^(bits) */ + unsigned int scale_uv = (st->int_vref_mv * 1000) >> AD7298_BITS; + + return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); +} +static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7298_show_scale, NULL, 0); + +static ssize_t ad7298_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); +} +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7298_show_name, NULL, 0); + +static struct attribute *ad7298_attributes[] = { + &iio_dev_attr_in0_raw.dev_attr.attr, + &iio_dev_attr_in1_raw.dev_attr.attr, + &iio_dev_attr_in2_raw.dev_attr.attr, + &iio_dev_attr_in3_raw.dev_attr.attr, + &iio_dev_attr_in4_raw.dev_attr.attr, + &iio_dev_attr_in5_raw.dev_attr.attr, + &iio_dev_attr_in6_raw.dev_attr.attr, + &iio_dev_attr_in7_raw.dev_attr.attr, + &iio_dev_attr_in_scale.dev_attr.attr, + &iio_dev_attr_temp0_input.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7298_attribute_group = { + .attrs = ad7298_attributes, +}; + +static int __devinit ad7298_probe(struct spi_device *spi) +{ + struct ad7298_platform_data *pdata = spi->dev.platform_data; + struct ad7298_state *st; + int ret; + + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + st->reg = regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + } + + spi_set_drvdata(spi, st); + + atomic_set(&st->protect_ring, 0); + st->spi = spi; + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + st->indio_dev->dev.parent = &spi->dev; + st->indio_dev->attrs = &ad7298_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + /* Setup default message */ + + st->scan_single_xfer[0].tx_buf = &st->tx_buf[0]; + st->scan_single_xfer[0].len = 2; + st->scan_single_xfer[0].cs_change = 1; + st->scan_single_xfer[1].tx_buf = &st->tx_buf[1]; + st->scan_single_xfer[1].len = 2; + st->scan_single_xfer[1].cs_change = 1; + st->scan_single_xfer[2].rx_buf = &st->rx_buf[0]; + st->scan_single_xfer[2].len = 2; + + spi_message_init(&st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg); + + if (pdata && pdata->vref_mv) { + st->int_vref_mv = pdata->vref_mv; + st->ext_ref = AD7298_EXTREF; + } else { + st->int_vref_mv = AD7298_INTREF_mV; + } + + ret = ad7298_register_ring_funcs_and_init(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_ring_buffer_register(st->indio_dev->ring, 0); + if (ret) + goto error_cleanup_ring; + return 0; + +error_cleanup_ring: + ad7298_ring_cleanup(st->indio_dev); + iio_device_unregister(st->indio_dev); +error_free_device: + iio_free_device(st->indio_dev); +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); + kfree(st); +error_ret: + return ret; +} + +static int __devexit ad7298_remove(struct spi_device *spi) +{ + struct ad7298_state *st = spi_get_drvdata(spi); + struct iio_dev *indio_dev = st->indio_dev; + + iio_ring_buffer_unregister(indio_dev->ring); + ad7298_ring_cleanup(indio_dev); + iio_device_unregister(indio_dev); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); + return 0; +} + +static const struct spi_device_id ad7298_id[] = { + {"ad7298", 0}, + {} +}; + +static struct spi_driver ad7298_driver = { + .driver = { + .name = "ad7298", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = ad7298_probe, + .remove = __devexit_p(ad7298_remove), + .id_table = ad7298_id, +}; + +static int __init ad7298_init(void) +{ + return spi_register_driver(&ad7298_driver); +} +module_init(ad7298_init); + +static void __exit ad7298_exit(void) +{ + spi_unregister_driver(&ad7298_driver); +} +module_exit(ad7298_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7298 ADC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ad7298"); diff --git a/drivers/staging/iio/adc/ad7298_ring.c b/drivers/staging/iio/adc/ad7298_ring.c new file mode 100644 index 000000000000..19d1aced1e6c --- /dev/null +++ b/drivers/staging/iio/adc/ad7298_ring.c @@ -0,0 +1,258 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> + +#include "../iio.h" +#include "../ring_generic.h" +#include "../ring_sw.h" +#include "../trigger.h" +#include "../sysfs.h" + +#include "ad7298.h" + +static IIO_SCAN_EL_C(in0, 0, 0, NULL); +static IIO_SCAN_EL_C(in1, 1, 0, NULL); +static IIO_SCAN_EL_C(in2, 2, 0, NULL); +static IIO_SCAN_EL_C(in3, 3, 0, NULL); +static IIO_SCAN_EL_C(in4, 4, 0, NULL); +static IIO_SCAN_EL_C(in5, 5, 0, NULL); +static IIO_SCAN_EL_C(in6, 6, 0, NULL); +static IIO_SCAN_EL_C(in7, 7, 0, NULL); + +static IIO_SCAN_EL_TIMESTAMP(8); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); + +static IIO_CONST_ATTR(in_type, "u12/16") ; + +static struct attribute *ad7298_scan_el_attrs[] = { + &iio_scan_el_in0.dev_attr.attr, + &iio_const_attr_in0_index.dev_attr.attr, + &iio_scan_el_in1.dev_attr.attr, + &iio_const_attr_in1_index.dev_attr.attr, + &iio_scan_el_in2.dev_attr.attr, + &iio_const_attr_in2_index.dev_attr.attr, + &iio_scan_el_in3.dev_attr.attr, + &iio_const_attr_in3_index.dev_attr.attr, + &iio_scan_el_in4.dev_attr.attr, + &iio_const_attr_in4_index.dev_attr.attr, + &iio_scan_el_in5.dev_attr.attr, + &iio_const_attr_in5_index.dev_attr.attr, + &iio_scan_el_in6.dev_attr.attr, + &iio_const_attr_in6_index.dev_attr.attr, + &iio_scan_el_in7.dev_attr.attr, + &iio_const_attr_in7_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, + &iio_const_attr_in_type.dev_attr.attr, + NULL, +}; + +static struct attribute_group ad7298_scan_el_group = { + .name = "scan_elements", + .attrs = ad7298_scan_el_attrs, +}; + +int ad7298_scan_from_ring(struct ad7298_state *st, long ch) +{ + struct iio_ring_buffer *ring = st->indio_dev->ring; + int ret; + u16 *ring_data; + + if (!(ring->scan_mask & (1 << ch))) { + ret = -EBUSY; + goto error_ret; + } + + ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL); + if (ring_data == NULL) { + ret = -ENOMEM; + goto error_ret; + } + ret = ring->access.read_last(ring, (u8 *) ring_data); + if (ret) + goto error_free_ring_data; + + ret = be16_to_cpu(ring_data[ch]); + +error_free_ring_data: + kfree(ring_data); +error_ret: + return ret; +} + +/** + * ad7298_ring_preenable() setup the parameters of the ring before enabling + * + * The complex nature of the setting of the number of bytes per datum is due + * to this driver currently ensuring that the timestamp is stored at an 8 + * byte boundary. + **/ +static int ad7298_ring_preenable(struct iio_dev *indio_dev) +{ + struct ad7298_state *st = indio_dev->dev_data; + struct iio_ring_buffer *ring = indio_dev->ring; + size_t d_size; + int i, m; + unsigned short command; + + d_size = ring->scan_count * (AD7298_STORAGE_BITS / 8); + + if (ring->scan_timestamp) { + d_size += sizeof(s64); + + if (d_size % sizeof(s64)) + d_size += sizeof(s64) - (d_size % sizeof(s64)); + } + + if (ring->access.set_bytes_per_datum) + ring->access.set_bytes_per_datum(ring, d_size); + + st->d_size = d_size; + + command = AD7298_WRITE | st->ext_ref; + + for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1) + if (ring->scan_mask & (1 << i)) + command |= m; + + st->tx_buf[0] = cpu_to_be16(command); + + /* build spi ring message */ + st->ring_xfer[0].tx_buf = &st->tx_buf[0]; + st->ring_xfer[0].len = 2; + st->ring_xfer[0].cs_change = 1; + st->ring_xfer[1].tx_buf = &st->tx_buf[1]; + st->ring_xfer[1].len = 2; + st->ring_xfer[1].cs_change = 1; + + spi_message_init(&st->ring_msg); + spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg); + spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg); + + for (i = 0; i < ring->scan_count; i++) { + st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i]; + st->ring_xfer[i + 2].len = 2; + st->ring_xfer[i + 2].cs_change = 1; + spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg); + } + /* make sure last transfer cs_change is not set */ + st->ring_xfer[i + 1].cs_change = 0; + + return 0; +} + +/** + * ad7298_poll_func_th() th of trigger launched polling to ring buffer + * + * As sampling only occurs on spi comms occuring, leave timestamping until + * then. Some triggers will generate their own time stamp. Currently + * there is no way of notifying them when no one cares. + **/ +static void ad7298_poll_func_th(struct iio_dev *indio_dev, s64 time) +{ + struct ad7298_state *st = indio_dev->dev_data; + + schedule_work(&st->poll_work); + return; +} + +/** + * ad7298_poll_bh_to_ring() bh of trigger launched polling to ring buffer + * @work_s: the work struct through which this was scheduled + * + * Currently there is no option in this driver to disable the saving of + * timestamps within the ring. + * I think the one copy of this at a time was to avoid problems if the + * trigger was set far too high and the reads then locked up the computer. + **/ +static void ad7298_poll_bh_to_ring(struct work_struct *work_s) +{ + struct ad7298_state *st = container_of(work_s, struct ad7298_state, + poll_work); + struct iio_dev *indio_dev = st->indio_dev; + struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring); + struct iio_ring_buffer *ring = indio_dev->ring; + s64 time_ns; + __u16 buf[16]; + int b_sent, i; + + /* Ensure only one copy of this function running at a time */ + if (atomic_inc_return(&st->protect_ring) > 1) + return; + + b_sent = spi_sync(st->spi, &st->ring_msg); + if (b_sent) + goto done; + + if (ring->scan_timestamp) { + time_ns = iio_get_time_ns(); + memcpy((u8 *)buf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); + } + + for (i = 0; i < ring->scan_count; i++) + buf[i] = be16_to_cpu(st->rx_buf[i]); + + indio_dev->ring->access.store_to(&sw_ring->buf, (u8 *)buf, time_ns); +done: + atomic_dec(&st->protect_ring); +} + +int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + struct ad7298_state *st = indio_dev->dev_data; + int ret; + + indio_dev->ring = iio_sw_rb_allocate(indio_dev); + if (!indio_dev->ring) { + ret = -ENOMEM; + goto error_ret; + } + /* Effectively select the ring buffer implementation */ + iio_ring_sw_register_funcs(&indio_dev->ring->access); + ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7298_poll_func_th); + if (ret) + goto error_deallocate_sw_rb; + + /* Ring buffer functions - here trigger setup related */ + + indio_dev->ring->preenable = &ad7298_ring_preenable; + indio_dev->ring->postenable = &iio_triggered_ring_postenable; + indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_el_attrs = &ad7298_scan_el_group; + indio_dev->ring->scan_timestamp = true; + + INIT_WORK(&st->poll_work, &ad7298_poll_bh_to_ring); + + /* Flag that polled ring buffering is possible */ + indio_dev->modes |= INDIO_RING_TRIGGERED; + return 0; +error_deallocate_sw_rb: + iio_sw_rb_free(indio_dev->ring); +error_ret: + return ret; +} + +void ad7298_ring_cleanup(struct iio_dev *indio_dev) +{ + if (indio_dev->trig) { + iio_put_trigger(indio_dev->trig); + iio_trigger_dettach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + } + kfree(indio_dev->pollfunc); + iio_sw_rb_free(indio_dev->ring); +} diff --git a/drivers/staging/iio/adc/ad7476.h b/drivers/staging/iio/adc/ad7476.h index b51b49e4abd6..f917e9c3d54f 100644 --- a/drivers/staging/iio/adc/ad7476.h +++ b/drivers/staging/iio/adc/ad7476.h @@ -33,6 +33,7 @@ struct ad7476_state { struct regulator *reg; struct work_struct poll_work; atomic_t protect_ring; + size_t d_size; u16 int_vref_mv; struct spi_transfer xfer; struct spi_message msg; diff --git a/drivers/staging/iio/adc/ad7476_core.c b/drivers/staging/iio/adc/ad7476_core.c index b8b54da67c63..d263904b3d1d 100644 --- a/drivers/staging/iio/adc/ad7476_core.c +++ b/drivers/staging/iio/adc/ad7476_core.c @@ -190,7 +190,7 @@ static int __devinit ad7476_probe(struct spi_device *spi) goto error_disable_reg; } - /* Estabilish that the iio_dev is a child of the i2c device */ + /* Establish that the iio_dev is a child of the spi device */ st->indio_dev->dev.parent = &spi->dev; st->indio_dev->attrs = &ad7476_attribute_group; st->indio_dev->dev_data = (void *)(st); diff --git a/drivers/staging/iio/adc/ad7476_ring.c b/drivers/staging/iio/adc/ad7476_ring.c index 85de14274ad7..1d654c86099d 100644 --- a/drivers/staging/iio/adc/ad7476_ring.c +++ b/drivers/staging/iio/adc/ad7476_ring.c @@ -26,6 +26,8 @@ #include "ad7476.h" static IIO_SCAN_EL_C(in0, 0, 0, NULL); +static IIO_SCAN_EL_TIMESTAMP(1); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); static ssize_t ad7476_show_type(struct device *dev, struct device_attribute *attr, @@ -44,6 +46,9 @@ static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7476_show_type, NULL, 0); static struct attribute *ad7476_scan_el_attrs[] = { &iio_scan_el_in0.dev_attr.attr, &iio_const_attr_in0_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; @@ -86,16 +91,21 @@ error_ret: static int ad7476_ring_preenable(struct iio_dev *indio_dev) { struct ad7476_state *st = indio_dev->dev_data; - size_t d_size; + struct iio_ring_buffer *ring = indio_dev->ring; - if (indio_dev->ring->access.set_bytes_per_datum) { - d_size = st->chip_info->storagebits / 8 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, - d_size); + st->d_size = ring->scan_count * st->chip_info->storagebits / 8; + + if (ring->scan_timestamp) { + st->d_size += sizeof(s64); + + if (st->d_size % sizeof(s64)) + st->d_size += sizeof(s64) - (st->d_size % sizeof(s64)); } + if (indio_dev->ring->access.set_bytes_per_datum) + indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, + st->d_size); + return 0; } @@ -131,18 +141,12 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *rxbuf; int b_sent; - size_t d_size; - - /* Ensure the timestamp is 8 byte aligned */ - d_size = st->chip_info->storagebits / 8 + sizeof(s64); - if (d_size % sizeof(s64)) - d_size += sizeof(s64) - (d_size % sizeof(s64)); /* Ensure only one copy of this function running at a time */ if (atomic_inc_return(&st->protect_ring) > 1) return; - rxbuf = kzalloc(d_size, GFP_KERNEL); + rxbuf = kzalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) return; @@ -152,7 +156,9 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s) time_ns = iio_get_time_ns(); - memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (indio_dev->ring->scan_timestamp) + memcpy(rxbuf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); indio_dev->ring->access.store_to(&sw_ring->buf, rxbuf, time_ns); done: @@ -182,6 +188,7 @@ int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; indio_dev->ring->scan_el_attrs = &ad7476_scan_el_group; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad7476_poll_bh_to_ring); diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h new file mode 100644 index 000000000000..338bade801a7 --- /dev/null +++ b/drivers/staging/iio/adc/ad7606.h @@ -0,0 +1,117 @@ +/* + * AD7606 ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef IIO_ADC_AD7606_H_ +#define IIO_ADC_AD7606_H_ + +/* + * TODO: struct ad7606_platform_data needs to go into include/linux/iio + */ + +/** + * struct ad7606_platform_data - platform/board specifc information + * @default_os: default oversampling value {0, 2, 4, 8, 16, 32, 64} + * @default_range: default range +/-{5000, 10000} mVolt + * @gpio_convst: number of gpio connected to the CONVST pin + * @gpio_reset: gpio connected to the RESET pin, if not used set to -1 + * @gpio_range: gpio connected to the RANGE pin, if not used set to -1 + * @gpio_os0: gpio connected to the OS0 pin, if not used set to -1 + * @gpio_os1: gpio connected to the OS1 pin, if not used set to -1 + * @gpio_os2: gpio connected to the OS2 pin, if not used set to -1 + * @gpio_frstdata: gpio connected to the FRSTDAT pin, if not used set to -1 + * @gpio_stby: gpio connected to the STBY pin, if not used set to -1 + */ + +struct ad7606_platform_data { + unsigned default_os; + unsigned default_range; + unsigned gpio_convst; + unsigned gpio_reset; + unsigned gpio_range; + unsigned gpio_os0; + unsigned gpio_os1; + unsigned gpio_os2; + unsigned gpio_frstdata; + unsigned gpio_stby; +}; + +/** + * struct ad7606_chip_info - chip specifc information + * @name: indentification string for chip + * @bits: accuracy of the adc in bits + * @bits: output coding [s]igned or [u]nsigned + * @int_vref_mv: the internal reference voltage + * @num_channels: number of physical inputs on chip + */ + +struct ad7606_chip_info { + char name[10]; + u8 bits; + char sign; + u16 int_vref_mv; + unsigned num_channels; +}; + +/** + * struct ad7606_state - driver instance specific data + */ + +struct ad7606_state { + struct iio_dev *indio_dev; + struct device *dev; + const struct ad7606_chip_info *chip_info; + struct ad7606_platform_data *pdata; + struct regulator *reg; + struct work_struct poll_work; + wait_queue_head_t wq_data_avail; + atomic_t protect_ring; + size_t d_size; + const struct ad7606_bus_ops *bops; + int irq; + unsigned id; + unsigned range; + unsigned oversampling; + bool done; + bool have_frstdata; + bool have_os; + bool have_stby; + bool have_reset; + bool have_range; + void __iomem *base_address; + + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + + unsigned short data[8] ____cacheline_aligned; +}; + +struct ad7606_bus_ops { + /* more methods added in future? */ + int (*read_block)(struct device *, int, void *); +}; + +void ad7606_suspend(struct ad7606_state *st); +void ad7606_resume(struct ad7606_state *st); +struct ad7606_state *ad7606_probe(struct device *dev, int irq, + void __iomem *base_address, unsigned id, + const struct ad7606_bus_ops *bops); +int ad7606_remove(struct ad7606_state *st); +int ad7606_reset(struct ad7606_state *st); + +enum ad7606_supported_device_ids { + ID_AD7606_8, + ID_AD7606_6, + ID_AD7606_4 +}; + +int ad7606_scan_from_ring(struct ad7606_state *st, unsigned ch); +int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev); +void ad7606_ring_cleanup(struct iio_dev *indio_dev); +#endif /* IIO_ADC_AD7606_H_ */ diff --git a/drivers/staging/iio/adc/ad7606_core.c b/drivers/staging/iio/adc/ad7606_core.c new file mode 100644 index 000000000000..4c700f07fb83 --- /dev/null +++ b/drivers/staging/iio/adc/ad7606_core.c @@ -0,0 +1,556 @@ +/* + * AD7606 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/list.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/delay.h> +#include <linux/sched.h> + +#include "../iio.h" +#include "../sysfs.h" +#include "../ring_generic.h" +#include "adc.h" + +#include "ad7606.h" + +int ad7606_reset(struct ad7606_state *st) +{ + if (st->have_reset) { + gpio_set_value(st->pdata->gpio_reset, 1); + ndelay(100); /* t_reset >= 100ns */ + gpio_set_value(st->pdata->gpio_reset, 0); + return 0; + } + + return -ENODEV; +} + +static int ad7606_scan_direct(struct ad7606_state *st, unsigned ch) +{ + int ret; + + st->done = false; + gpio_set_value(st->pdata->gpio_convst, 1); + + ret = wait_event_interruptible(st->wq_data_avail, st->done); + if (ret) + goto error_ret; + + if (st->have_frstdata) { + ret = st->bops->read_block(st->dev, 1, st->data); + if (ret) + goto error_ret; + if (!gpio_get_value(st->pdata->gpio_frstdata)) { + /* This should never happen */ + ad7606_reset(st); + ret = -EIO; + goto error_ret; + } + ret = st->bops->read_block(st->dev, + st->chip_info->num_channels - 1, &st->data[1]); + if (ret) + goto error_ret; + } else { + ret = st->bops->read_block(st->dev, + st->chip_info->num_channels, st->data); + if (ret) + goto error_ret; + } + + ret = st->data[ch]; + +error_ret: + gpio_set_value(st->pdata->gpio_convst, 0); + + return ret; +} + +static ssize_t ad7606_scan(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = dev_info->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int ret; + + mutex_lock(&dev_info->mlock); + if (iio_ring_enabled(dev_info)) + ret = ad7606_scan_from_ring(st, this_attr->address); + else + ret = ad7606_scan_direct(st, this_attr->address); + mutex_unlock(&dev_info->mlock); + + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", (short) ret); +} + +static IIO_DEV_ATTR_IN_RAW(0, ad7606_scan, 0); +static IIO_DEV_ATTR_IN_RAW(1, ad7606_scan, 1); +static IIO_DEV_ATTR_IN_RAW(2, ad7606_scan, 2); +static IIO_DEV_ATTR_IN_RAW(3, ad7606_scan, 3); +static IIO_DEV_ATTR_IN_RAW(4, ad7606_scan, 4); +static IIO_DEV_ATTR_IN_RAW(5, ad7606_scan, 5); +static IIO_DEV_ATTR_IN_RAW(6, ad7606_scan, 6); +static IIO_DEV_ATTR_IN_RAW(7, ad7606_scan, 7); + +static ssize_t ad7606_show_scale(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + /* Driver currently only support internal vref */ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + unsigned int scale_uv = (st->range * 1000 * 2) >> st->chip_info->bits; + + return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); +} +static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7606_show_scale, NULL, 0); + +static ssize_t ad7606_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%s\n", st->chip_info->name); +} + +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7606_show_name, NULL, 0); + +static ssize_t ad7606_show_range(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%u\n", st->range); +} + +static ssize_t ad7606_store_range(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + unsigned long lval; + + if (strict_strtoul(buf, 10, &lval)) + return -EINVAL; + if (!(lval == 5000 || lval == 10000)) { + dev_err(dev, "range is not supported\n"); + return -EINVAL; + } + mutex_lock(&dev_info->mlock); + gpio_set_value(st->pdata->gpio_range, lval == 10000); + st->range = lval; + mutex_unlock(&dev_info->mlock); + + return count; +} + +static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, \ + ad7606_show_range, ad7606_store_range, 0); +static IIO_CONST_ATTR(range_available, "5000 10000"); + +static ssize_t ad7606_show_oversampling_ratio(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%u\n", st->oversampling); +} + +static int ad7606_oversampling_get_index(unsigned val) +{ + unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64}; + int i; + + for (i = 0; i < ARRAY_SIZE(supported); i++) + if (val == supported[i]) + return i; + + return -EINVAL; +} + +static ssize_t ad7606_store_oversampling_ratio(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + unsigned long lval; + int ret; + + if (strict_strtoul(buf, 10, &lval)) + return -EINVAL; + + ret = ad7606_oversampling_get_index(lval); + if (ret < 0) { + dev_err(dev, "oversampling %lu is not supported\n", lval); + return ret; + } + + mutex_lock(&dev_info->mlock); + gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1); + gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1); + gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1); + st->oversampling = lval; + mutex_unlock(&dev_info->mlock); + + return count; +} + +static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR, + ad7606_show_oversampling_ratio, + ad7606_store_oversampling_ratio, 0); +static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64"); + +static struct attribute *ad7606_attributes[] = { + &iio_dev_attr_in0_raw.dev_attr.attr, + &iio_dev_attr_in1_raw.dev_attr.attr, + &iio_dev_attr_in2_raw.dev_attr.attr, + &iio_dev_attr_in3_raw.dev_attr.attr, + &iio_dev_attr_in4_raw.dev_attr.attr, + &iio_dev_attr_in5_raw.dev_attr.attr, + &iio_dev_attr_in6_raw.dev_attr.attr, + &iio_dev_attr_in7_raw.dev_attr.attr, + &iio_dev_attr_in_scale.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + &iio_dev_attr_range.dev_attr.attr, + &iio_const_attr_range_available.dev_attr.attr, + &iio_dev_attr_oversampling_ratio.dev_attr.attr, + &iio_const_attr_oversampling_ratio_available.dev_attr.attr, + NULL, +}; + +static mode_t ad7606_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7606_state *st = iio_dev_get_devdata(dev_info); + + mode_t mode = attr->mode; + + if (st->chip_info->num_channels <= 6 && + (attr == &iio_dev_attr_in7_raw.dev_attr.attr || + attr == &iio_dev_attr_in6_raw.dev_attr.attr)) + mode = 0; + else if (st->chip_info->num_channels <= 4 && + (attr == &iio_dev_attr_in5_raw.dev_attr.attr || + attr == &iio_dev_attr_in4_raw.dev_attr.attr)) + mode = 0; + else if (!st->have_os && + (attr == &iio_dev_attr_oversampling_ratio.dev_attr.attr || + attr == + &iio_const_attr_oversampling_ratio_available.dev_attr.attr)) + mode = 0; + else if (!st->have_range && + (attr == &iio_dev_attr_range.dev_attr.attr || + attr == &iio_const_attr_range_available.dev_attr.attr)) + mode = 0; + + return mode; +} + +static const struct attribute_group ad7606_attribute_group = { + .attrs = ad7606_attributes, + .is_visible = ad7606_attr_is_visible, +}; + +static const struct ad7606_chip_info ad7606_chip_info_tbl[] = { + /* + * More devices added in future + */ + [ID_AD7606_8] = { + .name = "ad7606", + .bits = 16, + .sign = IIO_SCAN_EL_TYPE_SIGNED, + .int_vref_mv = 2500, + .num_channels = 8, + }, + [ID_AD7606_6] = { + .name = "ad7606-6", + .bits = 16, + .sign = IIO_SCAN_EL_TYPE_SIGNED, + .int_vref_mv = 2500, + .num_channels = 6, + }, + [ID_AD7606_4] = { + .name = "ad7606-4", + .bits = 16, + .sign = IIO_SCAN_EL_TYPE_SIGNED, + .int_vref_mv = 2500, + .num_channels = 4, + }, +}; + +static int ad7606_request_gpios(struct ad7606_state *st) +{ + struct gpio gpio_array[3] = { + [0] = { + .gpio = st->pdata->gpio_os0, + .flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ? + GPIOF_INIT_HIGH : GPIOF_INIT_LOW), + .label = "AD7606_OS0", + }, + [1] = { + .gpio = st->pdata->gpio_os1, + .flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ? + GPIOF_INIT_HIGH : GPIOF_INIT_LOW), + .label = "AD7606_OS1", + }, + [2] = { + .gpio = st->pdata->gpio_os2, + .flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ? + GPIOF_INIT_HIGH : GPIOF_INIT_LOW), + .label = "AD7606_OS2", + }, + }; + int ret; + + ret = gpio_request_one(st->pdata->gpio_convst, GPIOF_OUT_INIT_LOW, + "AD7606_CONVST"); + if (ret) { + dev_err(st->dev, "failed to request GPIO CONVST\n"); + return ret; + } + + ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array)); + if (!ret) { + st->have_os = true; + } + + ret = gpio_request_one(st->pdata->gpio_reset, GPIOF_OUT_INIT_LOW, + "AD7606_RESET"); + if (!ret) + st->have_reset = true; + + ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT | + ((st->range == 10000) ? GPIOF_INIT_HIGH : + GPIOF_INIT_LOW), "AD7606_RANGE"); + if (!ret) + st->have_range = true; + + ret = gpio_request_one(st->pdata->gpio_stby, GPIOF_OUT_INIT_HIGH, + "AD7606_STBY"); + if (!ret) + st->have_stby = true; + + if (gpio_is_valid(st->pdata->gpio_frstdata)) { + ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN, + "AD7606_FRSTDATA"); + if (!ret) + st->have_frstdata = true; + } + + return 0; +} + +static void ad7606_free_gpios(struct ad7606_state *st) +{ + if (st->have_range) + gpio_free(st->pdata->gpio_range); + + if (st->have_stby) + gpio_free(st->pdata->gpio_stby); + + if (st->have_os) { + gpio_free(st->pdata->gpio_os0); + gpio_free(st->pdata->gpio_os1); + gpio_free(st->pdata->gpio_os2); + } + + if (st->have_reset) + gpio_free(st->pdata->gpio_reset); + + if (st->have_frstdata) + gpio_free(st->pdata->gpio_frstdata); + + gpio_free(st->pdata->gpio_convst); +} + +/** + * Interrupt handler + */ +static irqreturn_t ad7606_interrupt(int irq, void *dev_id) +{ + struct ad7606_state *st = dev_id; + + if (iio_ring_enabled(st->indio_dev)) { + if (!work_pending(&st->poll_work)) + schedule_work(&st->poll_work); + } else { + st->done = true; + wake_up_interruptible(&st->wq_data_avail); + } + + return IRQ_HANDLED; +}; + +struct ad7606_state *ad7606_probe(struct device *dev, int irq, + void __iomem *base_address, + unsigned id, + const struct ad7606_bus_ops *bops) +{ + struct ad7606_platform_data *pdata = dev->platform_data; + struct ad7606_state *st; + int ret; + + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + st->dev = dev; + st->id = id; + st->irq = irq; + st->bops = bops; + st->base_address = base_address; + st->range = pdata->default_range == 10000 ? 10000 : 5000; + + ret = ad7606_oversampling_get_index(pdata->default_os); + if (ret < 0) { + dev_warn(dev, "oversampling %d is not supported\n", + pdata->default_os); + st->oversampling = 0; + } else { + st->oversampling = pdata->default_os; + } + + st->reg = regulator_get(dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + } + + st->pdata = pdata; + st->chip_info = &ad7606_chip_info_tbl[id]; + + atomic_set(&st->protect_ring, 0); + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + st->indio_dev->dev.parent = dev; + st->indio_dev->attrs = &ad7606_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + init_waitqueue_head(&st->wq_data_avail); + + ret = ad7606_request_gpios(st); + if (ret) + goto error_free_device; + + ret = ad7606_reset(st); + if (ret) + dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); + + ret = request_irq(st->irq, ad7606_interrupt, + IRQF_TRIGGER_FALLING, st->chip_info->name, st); + if (ret) + goto error_free_gpios; + + ret = ad7606_register_ring_funcs_and_init(st->indio_dev); + if (ret) + goto error_free_irq; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_free_irq; + + ret = iio_ring_buffer_register(st->indio_dev->ring, 0); + if (ret) + goto error_cleanup_ring; + + return st; + +error_cleanup_ring: + ad7606_ring_cleanup(st->indio_dev); + iio_device_unregister(st->indio_dev); + +error_free_irq: + free_irq(st->irq, st); + +error_free_gpios: + ad7606_free_gpios(st); + +error_free_device: + iio_free_device(st->indio_dev); + +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); + kfree(st); +error_ret: + return ERR_PTR(ret); +} + +int ad7606_remove(struct ad7606_state *st) +{ + struct iio_dev *indio_dev = st->indio_dev; + iio_ring_buffer_unregister(indio_dev->ring); + ad7606_ring_cleanup(indio_dev); + iio_device_unregister(indio_dev); + free_irq(st->irq, st); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + + ad7606_free_gpios(st); + + kfree(st); + return 0; +} + +void ad7606_suspend(struct ad7606_state *st) +{ + if (st->have_stby) { + if (st->have_range) + gpio_set_value(st->pdata->gpio_range, 1); + gpio_set_value(st->pdata->gpio_stby, 0); + } +} + +void ad7606_resume(struct ad7606_state *st) +{ + if (st->have_stby) { + if (st->have_range) + gpio_set_value(st->pdata->gpio_range, + st->range == 10000); + + gpio_set_value(st->pdata->gpio_stby, 1); + ad7606_reset(st); + } +} + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/adc/ad7606_par.c b/drivers/staging/iio/adc/ad7606_par.c new file mode 100644 index 000000000000..43a554ce753d --- /dev/null +++ b/drivers/staging/iio/adc/ad7606_par.c @@ -0,0 +1,188 @@ +/* + * AD7606 Parallel Interface ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/types.h> +#include <linux/err.h> +#include <linux/io.h> + +#include "ad7606.h" + +static int ad7606_par16_read_block(struct device *dev, + int count, void *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct ad7606_state *st = platform_get_drvdata(pdev); + + insw((unsigned long) st->base_address, buf, count); + + return 0; +} + +static const struct ad7606_bus_ops ad7606_par16_bops = { + .read_block = ad7606_par16_read_block, +}; + +static int ad7606_par8_read_block(struct device *dev, + int count, void *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct ad7606_state *st = platform_get_drvdata(pdev); + + insb((unsigned long) st->base_address, buf, count * 2); + + return 0; +} + +static const struct ad7606_bus_ops ad7606_par8_bops = { + .read_block = ad7606_par8_read_block, +}; + +static int __devinit ad7606_par_probe(struct platform_device *pdev) +{ + struct resource *res; + struct ad7606_state *st; + void __iomem *addr; + resource_size_t remap_size; + int ret, irq; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "no irq\n"); + return -ENODEV; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + remap_size = resource_size(res); + + /* Request the regions */ + if (!request_mem_region(res->start, remap_size, "iio-ad7606")) { + ret = -EBUSY; + goto out1; + } + addr = ioremap(res->start, remap_size); + if (!addr) { + ret = -ENOMEM; + goto out1; + } + + st = ad7606_probe(&pdev->dev, irq, addr, + platform_get_device_id(pdev)->driver_data, + remap_size > 1 ? &ad7606_par16_bops : + &ad7606_par8_bops); + + if (IS_ERR(st)) { + ret = PTR_ERR(st); + goto out2; + } + + platform_set_drvdata(pdev, st); + + return 0; + +out2: + iounmap(addr); +out1: + release_mem_region(res->start, remap_size); + + return ret; +} + +static int __devexit ad7606_par_remove(struct platform_device *pdev) +{ + struct ad7606_state *st = platform_get_drvdata(pdev); + struct resource *res; + + ad7606_remove(st); + + iounmap(st->base_address); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(res->start, resource_size(res)); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int ad7606_par_suspend(struct device *dev) +{ + struct ad7606_state *st = dev_get_drvdata(dev); + + ad7606_suspend(st); + + return 0; +} + +static int ad7606_par_resume(struct device *dev) +{ + struct ad7606_state *st = dev_get_drvdata(dev); + + ad7606_resume(st); + + return 0; +} + +static const struct dev_pm_ops ad7606_pm_ops = { + .suspend = ad7606_par_suspend, + .resume = ad7606_par_resume, +}; +#define AD7606_PAR_PM_OPS (&ad7606_pm_ops) + +#else +#define AD7606_PAR_PM_OPS NULL +#endif /* CONFIG_PM */ + +static struct platform_device_id ad7606_driver_ids[] = { + { + .name = "ad7606-8", + .driver_data = ID_AD7606_8, + }, { + .name = "ad7606-6", + .driver_data = ID_AD7606_6, + }, { + .name = "ad7606-4", + .driver_data = ID_AD7606_4, + }, + { } +}; + +MODULE_DEVICE_TABLE(platform, ad7606_driver_ids); + +static struct platform_driver ad7606_driver = { + .probe = ad7606_par_probe, + .remove = __devexit_p(ad7606_par_remove), + .id_table = ad7606_driver_ids, + .driver = { + .name = "ad7606", + .owner = THIS_MODULE, + .pm = AD7606_PAR_PM_OPS, + }, +}; + +static int __init ad7606_init(void) +{ + return platform_driver_register(&ad7606_driver); +} + +static void __exit ad7606_cleanup(void) +{ + platform_driver_unregister(&ad7606_driver); +} + +module_init(ad7606_init); +module_exit(ad7606_cleanup); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:ad7606_par"); diff --git a/drivers/staging/iio/adc/ad7606_ring.c b/drivers/staging/iio/adc/ad7606_ring.c new file mode 100644 index 000000000000..b32cb0dea6d8 --- /dev/null +++ b/drivers/staging/iio/adc/ad7606_ring.c @@ -0,0 +1,280 @@ +/* + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + * + */ + +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> + +#include "../iio.h" +#include "../ring_generic.h" +#include "../ring_sw.h" +#include "../trigger.h" +#include "../sysfs.h" + +#include "ad7606.h" + +static IIO_SCAN_EL_C(in0, 0, 0, NULL); +static IIO_SCAN_EL_C(in1, 1, 0, NULL); +static IIO_SCAN_EL_C(in2, 2, 0, NULL); +static IIO_SCAN_EL_C(in3, 3, 0, NULL); +static IIO_SCAN_EL_C(in4, 4, 0, NULL); +static IIO_SCAN_EL_C(in5, 5, 0, NULL); +static IIO_SCAN_EL_C(in6, 6, 0, NULL); +static IIO_SCAN_EL_C(in7, 7, 0, NULL); + +static IIO_SCAN_EL_TIMESTAMP(8); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); + +static ssize_t ad7606_show_type(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_ring_buffer *ring = dev_get_drvdata(dev); + struct iio_dev *indio_dev = ring->indio_dev; + struct ad7606_state *st = indio_dev->dev_data; + + return sprintf(buf, "%c%d/%d\n", st->chip_info->sign, + st->chip_info->bits, st->chip_info->bits); +} +static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7606_show_type, NULL, 0); + +static struct attribute *ad7606_scan_el_attrs[] = { + &iio_scan_el_in0.dev_attr.attr, + &iio_const_attr_in0_index.dev_attr.attr, + &iio_scan_el_in1.dev_attr.attr, + &iio_const_attr_in1_index.dev_attr.attr, + &iio_scan_el_in2.dev_attr.attr, + &iio_const_attr_in2_index.dev_attr.attr, + &iio_scan_el_in3.dev_attr.attr, + &iio_const_attr_in3_index.dev_attr.attr, + &iio_scan_el_in4.dev_attr.attr, + &iio_const_attr_in4_index.dev_attr.attr, + &iio_scan_el_in5.dev_attr.attr, + &iio_const_attr_in5_index.dev_attr.attr, + &iio_scan_el_in6.dev_attr.attr, + &iio_const_attr_in6_index.dev_attr.attr, + &iio_scan_el_in7.dev_attr.attr, + &iio_const_attr_in7_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, + &iio_dev_attr_in_type.dev_attr.attr, + NULL, +}; + +static mode_t ad7606_scan_el_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct iio_ring_buffer *ring = dev_get_drvdata(dev); + struct iio_dev *indio_dev = ring->indio_dev; + struct ad7606_state *st = indio_dev->dev_data; + + mode_t mode = attr->mode; + + if (st->chip_info->num_channels <= 6 && + (attr == &iio_scan_el_in7.dev_attr.attr || + attr == &iio_const_attr_in7_index.dev_attr.attr || + attr == &iio_scan_el_in6.dev_attr.attr || + attr == &iio_const_attr_in6_index.dev_attr.attr)) + mode = 0; + else if (st->chip_info->num_channels <= 4 && + (attr == &iio_scan_el_in5.dev_attr.attr || + attr == &iio_const_attr_in5_index.dev_attr.attr || + attr == &iio_scan_el_in4.dev_attr.attr || + attr == &iio_const_attr_in4_index.dev_attr.attr)) + mode = 0; + + return mode; +} + +static struct attribute_group ad7606_scan_el_group = { + .name = "scan_elements", + .attrs = ad7606_scan_el_attrs, + .is_visible = ad7606_scan_el_attr_is_visible, +}; + +int ad7606_scan_from_ring(struct ad7606_state *st, unsigned ch) +{ + struct iio_ring_buffer *ring = st->indio_dev->ring; + int ret; + u16 *ring_data; + + ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL); + if (ring_data == NULL) { + ret = -ENOMEM; + goto error_ret; + } + ret = ring->access.read_last(ring, (u8 *) ring_data); + if (ret) + goto error_free_ring_data; + + ret = ring_data[ch]; + +error_free_ring_data: + kfree(ring_data); +error_ret: + return ret; +} + +/** + * ad7606_ring_preenable() setup the parameters of the ring before enabling + * + * The complex nature of the setting of the nuber of bytes per datum is due + * to this driver currently ensuring that the timestamp is stored at an 8 + * byte boundary. + **/ +static int ad7606_ring_preenable(struct iio_dev *indio_dev) +{ + struct ad7606_state *st = indio_dev->dev_data; + struct iio_ring_buffer *ring = indio_dev->ring; + size_t d_size; + + d_size = st->chip_info->num_channels * + st->chip_info->bits / 8; + + if (ring->scan_timestamp) { + d_size += sizeof(s64); + + if (d_size % sizeof(s64)) + d_size += sizeof(s64) - (d_size % sizeof(s64)); + } + + if (ring->access.set_bytes_per_datum) + ring->access.set_bytes_per_datum(ring, d_size); + + st->d_size = d_size; + + return 0; +} + +/** + * ad7606_poll_func_th() th of trigger launched polling to ring buffer + * + **/ +static void ad7606_poll_func_th(struct iio_dev *indio_dev, s64 time) +{ + struct ad7606_state *st = indio_dev->dev_data; + gpio_set_value(st->pdata->gpio_convst, 1); + + return; +} +/** + * ad7606_poll_bh_to_ring() bh of trigger launched polling to ring buffer + * @work_s: the work struct through which this was scheduled + * + * Currently there is no option in this driver to disable the saving of + * timestamps within the ring. + * I think the one copy of this at a time was to avoid problems if the + * trigger was set far too high and the reads then locked up the computer. + **/ +static void ad7606_poll_bh_to_ring(struct work_struct *work_s) +{ + struct ad7606_state *st = container_of(work_s, struct ad7606_state, + poll_work); + struct iio_dev *indio_dev = st->indio_dev; + struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring); + struct iio_ring_buffer *ring = indio_dev->ring; + s64 time_ns; + __u8 *buf; + int ret; + + /* Ensure only one copy of this function running at a time */ + if (atomic_inc_return(&st->protect_ring) > 1) + return; + + buf = kzalloc(st->d_size, GFP_KERNEL); + if (buf == NULL) + return; + + if (st->have_frstdata) { + ret = st->bops->read_block(st->dev, 1, buf); + if (ret) + goto done; + if (!gpio_get_value(st->pdata->gpio_frstdata)) { + /* This should never happen. However + * some signal glitch caused by bad PCB desgin or + * electrostatic discharge, could cause an extra read + * or clock. This allows recovery. + */ + ad7606_reset(st); + goto done; + } + ret = st->bops->read_block(st->dev, + st->chip_info->num_channels - 1, buf + 2); + if (ret) + goto done; + } else { + ret = st->bops->read_block(st->dev, + st->chip_info->num_channels, buf); + if (ret) + goto done; + } + + time_ns = iio_get_time_ns(); + + if (ring->scan_timestamp) + memcpy(buf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); + + ring->access.store_to(&sw_ring->buf, buf, time_ns); +done: + gpio_set_value(st->pdata->gpio_convst, 0); + kfree(buf); + atomic_dec(&st->protect_ring); +} + +int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + struct ad7606_state *st = indio_dev->dev_data; + int ret; + + indio_dev->ring = iio_sw_rb_allocate(indio_dev); + if (!indio_dev->ring) { + ret = -ENOMEM; + goto error_ret; + } + + /* Effectively select the ring buffer implementation */ + iio_ring_sw_register_funcs(&indio_dev->ring->access); + ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7606_poll_func_th); + if (ret) + goto error_deallocate_sw_rb; + + /* Ring buffer functions - here trigger setup related */ + + indio_dev->ring->preenable = &ad7606_ring_preenable; + indio_dev->ring->postenable = &iio_triggered_ring_postenable; + indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_el_attrs = &ad7606_scan_el_group; + indio_dev->ring->scan_timestamp = true ; + + INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring); + + /* Flag that polled ring buffering is possible */ + indio_dev->modes |= INDIO_RING_TRIGGERED; + return 0; +error_deallocate_sw_rb: + iio_sw_rb_free(indio_dev->ring); +error_ret: + return ret; +} + +void ad7606_ring_cleanup(struct iio_dev *indio_dev) +{ + if (indio_dev->trig) { + iio_put_trigger(indio_dev->trig); + iio_trigger_dettach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + } + kfree(indio_dev->pollfunc); + iio_sw_rb_free(indio_dev->ring); +} diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/adc/ad7606_spi.c new file mode 100644 index 000000000000..d738491222f2 --- /dev/null +++ b/drivers/staging/iio/adc/ad7606_spi.c @@ -0,0 +1,126 @@ +/* + * AD7606 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/types.h> +#include <linux/err.h> +#include "ad7606.h" + +#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */ + +static int ad7606_spi_read_block(struct device *dev, + int count, void *buf) +{ + struct spi_device *spi = to_spi_device(dev); + int i, ret; + unsigned short *data = buf; + + ret = spi_read(spi, (u8 *)buf, count * 2); + if (ret < 0) { + dev_err(&spi->dev, "SPI read error\n"); + return ret; + } + + for (i = 0; i < count; i++) + data[i] = be16_to_cpu(data[i]); + + return 0; +} + +static const struct ad7606_bus_ops ad7606_spi_bops = { + .read_block = ad7606_spi_read_block, +}; + +static int __devinit ad7606_spi_probe(struct spi_device *spi) +{ + struct ad7606_state *st; + + st = ad7606_probe(&spi->dev, spi->irq, NULL, + spi_get_device_id(spi)->driver_data, + &ad7606_spi_bops); + + if (IS_ERR(st)) + return PTR_ERR(st); + + spi_set_drvdata(spi, st); + + return 0; +} + +static int __devexit ad7606_spi_remove(struct spi_device *spi) +{ + struct ad7606_state *st = dev_get_drvdata(&spi->dev); + + return ad7606_remove(st); +} + +#ifdef CONFIG_PM +static int ad7606_spi_suspend(struct device *dev) +{ + struct ad7606_state *st = dev_get_drvdata(dev); + + ad7606_suspend(st); + + return 0; +} + +static int ad7606_spi_resume(struct device *dev) +{ + struct ad7606_state *st = dev_get_drvdata(dev); + + ad7606_resume(st); + + return 0; +} + +static const struct dev_pm_ops ad7606_pm_ops = { + .suspend = ad7606_spi_suspend, + .resume = ad7606_spi_resume, +}; +#define AD7606_SPI_PM_OPS (&ad7606_pm_ops) + +#else +#define AD7606_SPI_PM_OPS NULL +#endif + +static const struct spi_device_id ad7606_id[] = { + {"ad7606-8", ID_AD7606_8}, + {"ad7606-6", ID_AD7606_6}, + {"ad7606-4", ID_AD7606_4}, + {} +}; + +static struct spi_driver ad7606_driver = { + .driver = { + .name = "ad7606", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + .pm = AD7606_SPI_PM_OPS, + }, + .probe = ad7606_spi_probe, + .remove = __devexit_p(ad7606_spi_remove), + .id_table = ad7606_id, +}; + +static int __init ad7606_spi_init(void) +{ + return spi_register_driver(&ad7606_driver); +} +module_init(ad7606_spi_init); + +static void __exit ad7606_spi_exit(void) +{ + spi_unregister_driver(&ad7606_driver); +} +module_exit(ad7606_spi_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ad7606_spi"); diff --git a/drivers/staging/iio/adc/ad7887.h b/drivers/staging/iio/adc/ad7887.h index 8c2a218c9496..439c802b38f2 100644 --- a/drivers/staging/iio/adc/ad7887.h +++ b/drivers/staging/iio/adc/ad7887.h @@ -63,6 +63,7 @@ struct ad7887_state { struct regulator *reg; struct work_struct poll_work; atomic_t protect_ring; + size_t d_size; u16 int_vref_mv; bool en_dual; struct spi_transfer xfer[4]; diff --git a/drivers/staging/iio/adc/ad7887_ring.c b/drivers/staging/iio/adc/ad7887_ring.c index 6b9cb1f95a1e..2d7fe65049dd 100644 --- a/drivers/staging/iio/adc/ad7887_ring.c +++ b/drivers/staging/iio/adc/ad7887_ring.c @@ -27,6 +27,8 @@ static IIO_SCAN_EL_C(in0, 0, 0, NULL); static IIO_SCAN_EL_C(in1, 1, 0, NULL); +static IIO_SCAN_EL_TIMESTAMP(2); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); static ssize_t ad7887_show_type(struct device *dev, struct device_attribute *attr, @@ -47,6 +49,9 @@ static struct attribute *ad7887_scan_el_attrs[] = { &iio_const_attr_in0_index.dev_attr.attr, &iio_scan_el_in1.dev_attr.attr, &iio_const_attr_in1_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; @@ -118,16 +123,20 @@ static int ad7887_ring_preenable(struct iio_dev *indio_dev) { struct ad7887_state *st = indio_dev->dev_data; struct iio_ring_buffer *ring = indio_dev->ring; - size_t d_size; - if (indio_dev->ring->access.set_bytes_per_datum) { - d_size = st->chip_info->storagebits / 8 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, - d_size); + st->d_size = ring->scan_count * st->chip_info->storagebits / 8; + + if (ring->scan_timestamp) { + st->d_size += sizeof(s64); + + if (st->d_size % sizeof(s64)) + st->d_size += sizeof(s64) - (st->d_size % sizeof(s64)); } + if (indio_dev->ring->access.set_bytes_per_datum) + indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, + st->d_size); + switch (ring->scan_mask) { case (1 << 0): st->ring_msg = &st->msg[AD7887_CH0]; @@ -186,20 +195,14 @@ static void ad7887_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *buf; int b_sent; - size_t d_size; unsigned int bytes = ring->scan_count * st->chip_info->storagebits / 8; - /* Ensure the timestamp is 8 byte aligned */ - d_size = bytes + sizeof(s64); - if (d_size % sizeof(s64)) - d_size += sizeof(s64) - (d_size % sizeof(s64)); - /* Ensure only one copy of this function running at a time */ if (atomic_inc_return(&st->protect_ring) > 1) return; - buf = kzalloc(d_size, GFP_KERNEL); + buf = kzalloc(st->d_size, GFP_KERNEL); if (buf == NULL) return; @@ -210,7 +213,9 @@ static void ad7887_poll_bh_to_ring(struct work_struct *work_s) time_ns = iio_get_time_ns(); memcpy(buf, st->data, bytes); - memcpy(buf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (ring->scan_timestamp) + memcpy(buf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); indio_dev->ring->access.store_to(&sw_ring->buf, buf, time_ns); done: @@ -241,6 +246,7 @@ int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->predisable = &iio_triggered_ring_predisable; indio_dev->ring->postdisable = &ad7887_ring_postdisable; indio_dev->ring->scan_el_attrs = &ad7887_scan_el_group; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad7887_poll_bh_to_ring); diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h index 81a20d524b77..a421362c77f9 100644 --- a/drivers/staging/iio/adc/ad799x.h +++ b/drivers/staging/iio/adc/ad799x.h @@ -116,6 +116,7 @@ struct ad799x_state { struct work_struct poll_work; struct work_struct work_thresh; atomic_t protect_ring; + size_t d_size; struct iio_trigger *trig; struct regulator *reg; s64 last_timestamp; diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c index 89ccf375a188..e50841b3ac69 100644 --- a/drivers/staging/iio/adc/ad799x_core.c +++ b/drivers/staging/iio/adc/ad799x_core.c @@ -123,6 +123,9 @@ static AD799X_SCAN_EL(5); static AD799X_SCAN_EL(6); static AD799X_SCAN_EL(7); +static IIO_SCAN_EL_TIMESTAMP(8); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64) + static ssize_t ad799x_show_type(struct device *dev, struct device_attribute *attr, char *buf) @@ -471,6 +474,9 @@ static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = { &iio_const_attr_in2_index.dev_attr.attr, &iio_scan_el_in3.dev_attr.attr, &iio_const_attr_in3_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; @@ -497,6 +503,9 @@ static struct attribute *ad7992_scan_el_attrs[] = { &iio_const_attr_in0_index.dev_attr.attr, &iio_scan_el_in1.dev_attr.attr, &iio_const_attr_in1_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; @@ -541,6 +550,9 @@ static struct attribute *ad7997_8_scan_el_attrs[] = { &iio_const_attr_in6_index.dev_attr.attr, &iio_scan_el_in7.dev_attr.attr, &iio_const_attr_in7_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c index 975cdcbf0830..56abc395f177 100644 --- a/drivers/staging/iio/adc/ad799x_ring.c +++ b/drivers/staging/iio/adc/ad799x_ring.c @@ -73,8 +73,6 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) { struct iio_ring_buffer *ring = indio_dev->ring; struct ad799x_state *st = indio_dev->dev_data; - size_t d_size; - unsigned long numvals; /* * Need to figure out the current mode based upon the requested @@ -84,15 +82,19 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) if (st->id == ad7997 || st->id == ad7998) ad799x_set_scan_mode(st, ring->scan_mask); - numvals = ring->scan_count; + st->d_size = ring->scan_count * 2; - if (ring->access.set_bytes_per_datum) { - d_size = numvals*2 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - ring->access.set_bytes_per_datum(ring, d_size); + if (ring->scan_timestamp) { + st->d_size += sizeof(s64); + + if (st->d_size % sizeof(s64)) + st->d_size += sizeof(s64) - (st->d_size % sizeof(s64)); } + if (indio_dev->ring->access.set_bytes_per_datum) + indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, + st->d_size); + return 0; } @@ -130,29 +132,13 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *rxbuf; int b_sent; - size_t d_size; u8 cmd; - unsigned long numvals = ring->scan_count; - - /* Ensure the timestamp is 8 byte aligned */ - d_size = numvals*2 + sizeof(s64); - - if (d_size % sizeof(s64)) - d_size += sizeof(s64) - (d_size % sizeof(s64)); - /* Ensure only one copy of this function running at a time */ if (atomic_inc_return(&st->protect_ring) > 1) return; - /* Monitor mode prevents reading. Whilst not currently implemented - * might as well have this test in here in the meantime as it does - * no harm. - */ - if (numvals == 0) - return; - - rxbuf = kmalloc(d_size, GFP_KERNEL); + rxbuf = kmalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) return; @@ -177,13 +163,15 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) } b_sent = i2c_smbus_read_i2c_block_data(st->client, - cmd, numvals*2, rxbuf); + cmd, ring->scan_count * 2, rxbuf); if (b_sent < 0) goto done; time_ns = iio_get_time_ns(); - memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (ring->scan_timestamp) + memcpy(rxbuf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); ring->access.store_to(&ring_sw->buf, rxbuf, time_ns); done: @@ -213,6 +201,7 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->preenable = &ad799x_ring_preenable; indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring); |