diff options
Diffstat (limited to 'drivers/staging/iio/dac/max517.c')
| -rw-r--r-- | drivers/staging/iio/dac/max517.c | 294 |
1 files changed, 0 insertions, 294 deletions
diff --git a/drivers/staging/iio/dac/max517.c b/drivers/staging/iio/dac/max517.c deleted file mode 100644 index 5287cad1f3a4..000000000000 --- a/drivers/staging/iio/dac/max517.c +++ /dev/null @@ -1,294 +0,0 @@ -/* - * max517.c - Support for Maxim MAX517, MAX518 and MAX519 - * - * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/jiffies.h> -#include <linux/i2c.h> -#include <linux/err.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include "dac.h" - -#include "max517.h" - -#define MAX517_DRV_NAME "max517" - -/* Commands */ -#define COMMAND_CHANNEL0 0x00 -#define COMMAND_CHANNEL1 0x01 /* for MAX518 and MAX519 */ -#define COMMAND_PD 0x08 /* Power Down */ - -enum max517_device_ids { - ID_MAX517, - ID_MAX518, - ID_MAX519, -}; - -struct max517_data { - struct iio_dev *indio_dev; - struct i2c_client *client; - unsigned short vref_mv[2]; -}; - -/* - * channel: bit 0: channel 1 - * bit 1: channel 2 - * (this way, it's possible to set both channels at once) - */ -static ssize_t max517_set_value(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count, int channel) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct max517_data *data = iio_priv(indio_dev); - struct i2c_client *client = data->client; - u8 outbuf[4]; /* 1x or 2x command + value */ - int outbuf_size = 0; - int res; - long val; - - res = strict_strtol(buf, 10, &val); - - if (res) - return res; - - if (val < 0 || val > 255) - return -EINVAL; - - if (channel & 1) { - outbuf[outbuf_size++] = COMMAND_CHANNEL0; - outbuf[outbuf_size++] = val; - } - if (channel & 2) { - outbuf[outbuf_size++] = COMMAND_CHANNEL1; - outbuf[outbuf_size++] = val; - } - - /* - * At this point, there are always 1 or 2 two-byte commands in - * outbuf. With 2 commands, the device can set two outputs - * simultaneously, latching the values upon the end of the I2C - * transfer. - */ - - res = i2c_master_send(client, outbuf, outbuf_size); - if (res < 0) - return res; - - return count; -} - -static ssize_t max517_set_value_1(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - return max517_set_value(dev, attr, buf, count, 1); -} -static IIO_DEV_ATTR_OUT_RAW(1, max517_set_value_1, 0); - -static ssize_t max517_set_value_2(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - return max517_set_value(dev, attr, buf, count, 2); -} -static IIO_DEV_ATTR_OUT_RAW(2, max517_set_value_2, 1); - -static ssize_t max517_set_value_both(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - return max517_set_value(dev, attr, buf, count, 3); -} -static IIO_DEVICE_ATTR_NAMED(out_voltage1and2_raw, - out_voltage1&2_raw, S_IWUSR, NULL, - max517_set_value_both, -1); - -static ssize_t max517_show_scale(struct device *dev, - struct device_attribute *attr, - char *buf, int channel) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct max517_data *data = iio_priv(indio_dev); - /* Corresponds to Vref / 2^(bits) */ - unsigned int scale_uv = (data->vref_mv[channel - 1] * 1000) >> 8; - - return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); -} - -static ssize_t max517_show_scale1(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - return max517_show_scale(dev, attr, buf, 1); -} -static IIO_DEVICE_ATTR(out_voltage1_scale, S_IRUGO, - max517_show_scale1, NULL, 0); - -static ssize_t max517_show_scale2(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - return max517_show_scale(dev, attr, buf, 2); -} -static IIO_DEVICE_ATTR(out_voltage2_scale, S_IRUGO, - max517_show_scale2, NULL, 0); - -/* On MAX517 variant, we have one output */ -static struct attribute *max517_attributes[] = { - &iio_dev_attr_out_voltage1_raw.dev_attr.attr, - &iio_dev_attr_out_voltage1_scale.dev_attr.attr, - NULL -}; - -static struct attribute_group max517_attribute_group = { - .attrs = max517_attributes, -}; - -/* On MAX518 and MAX519 variant, we have two outputs */ -static struct attribute *max518_attributes[] = { - &iio_dev_attr_out_voltage1_raw.dev_attr.attr, - &iio_dev_attr_out_voltage1_scale.dev_attr.attr, - &iio_dev_attr_out_voltage2_raw.dev_attr.attr, - &iio_dev_attr_out_voltage2_scale.dev_attr.attr, - &iio_dev_attr_out_voltage1and2_raw.dev_attr.attr, - NULL -}; - -static struct attribute_group max518_attribute_group = { - .attrs = max518_attributes, -}; - -#ifdef CONFIG_PM_SLEEP -static int max517_suspend(struct device *dev) -{ - u8 outbuf = COMMAND_PD; - - return i2c_master_send(to_i2c_client(dev), &outbuf, 1); -} - -static int max517_resume(struct device *dev) -{ - u8 outbuf = 0; - - return i2c_master_send(to_i2c_client(dev), &outbuf, 1); -} - -static SIMPLE_DEV_PM_OPS(max517_pm_ops, max517_suspend, max517_resume); -#define MAX517_PM_OPS (&max517_pm_ops) -#else -#define MAX517_PM_OPS NULL -#endif - -static const struct iio_info max517_info = { - .attrs = &max517_attribute_group, - .driver_module = THIS_MODULE, -}; - -static const struct iio_info max518_info = { - .attrs = &max518_attribute_group, - .driver_module = THIS_MODULE, -}; - -static int max517_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct max517_data *data; - struct iio_dev *indio_dev; - struct max517_platform_data *platform_data = client->dev.platform_data; - int err; - - indio_dev = iio_device_alloc(sizeof(*data)); - if (indio_dev == NULL) { - err = -ENOMEM; - goto exit; - } - data = iio_priv(indio_dev); - i2c_set_clientdata(client, indio_dev); - data->client = client; - - /* establish that the iio_dev is a child of the i2c device */ - indio_dev->dev.parent = &client->dev; - - /* reduced attribute set for MAX517 */ - if (id->driver_data == ID_MAX517) - indio_dev->info = &max517_info; - else - indio_dev->info = &max518_info; - indio_dev->modes = INDIO_DIRECT_MODE; - - /* - * Reference voltage on MAX518 and default is 5V, else take vref_mv - * from platform_data - */ - if (id->driver_data == ID_MAX518 || !platform_data) { - data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */ - } else { - data->vref_mv[0] = platform_data->vref_mv[0]; - data->vref_mv[1] = platform_data->vref_mv[1]; - } - - err = iio_device_register(indio_dev); - if (err) - goto exit_free_device; - - dev_info(&client->dev, "DAC registered\n"); - - return 0; - -exit_free_device: - iio_device_free(indio_dev); -exit: - return err; -} - -static int max517_remove(struct i2c_client *client) -{ - iio_device_unregister(i2c_get_clientdata(client)); - iio_device_free(i2c_get_clientdata(client)); - - return 0; -} - -static const struct i2c_device_id max517_id[] = { - { "max517", ID_MAX517 }, - { "max518", ID_MAX518 }, - { "max519", ID_MAX519 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, max517_id); - -static struct i2c_driver max517_driver = { - .driver = { - .name = MAX517_DRV_NAME, - .pm = MAX517_PM_OPS, - }, - .probe = max517_probe, - .remove = max517_remove, - .id_table = max517_id, -}; -module_i2c_driver(max517_driver); - -MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); -MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC"); -MODULE_LICENSE("GPL"); |