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author | Gwendal Grignou <gwendal@chromium.org> | 2019-07-15 16:14:53 -0700 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2019-07-27 23:06:59 +0100 |
commit | d96e267762fc723079b8089172077e94a4cf8dd2 (patch) | |
tree | 3000eb6f3baaf874a2df6a717a8346058f6b22b8 | |
parent | b9a0a64e3b35934128551a25513d91bd634736ed (diff) | |
download | linux-stable-d96e267762fc723079b8089172077e94a4cf8dd2.tar.gz linux-stable-d96e267762fc723079b8089172077e94a4cf8dd2.tar.bz2 linux-stable-d96e267762fc723079b8089172077e94a4cf8dd2.zip |
iio: cros_ec_accel_legacy: Use cros_ec_sensors_core
Remove duplicate code in cros-ec-accel-legacy,
use cros-ec-sensors-core functions and structures when possible.
On glimmer, check the 2 accelerometers are presented and working.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
-rw-r--r-- | drivers/iio/accel/Kconfig | 4 | ||||
-rw-r--r-- | drivers/iio/accel/cros_ec_accel_legacy.c | 336 |
2 files changed, 55 insertions, 285 deletions
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 9b9656ce37e6..d4ef35aeb579 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -202,9 +202,7 @@ config HID_SENSOR_ACCEL_3D config IIO_CROS_EC_ACCEL_LEGACY tristate "ChromeOS EC Legacy Accelerometer Sensor" - select IIO_BUFFER - select IIO_TRIGGERED_BUFFER - select CROS_EC_LPC_REGISTER_DEVICE + depends on IIO_CROS_EC_SENSORS_CORE help Say yes here to get support for accelerometers on Chromebook using legacy EC firmware. diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c index ad19d9c716f4..f65578c65a1c 100644 --- a/drivers/iio/accel/cros_ec_accel_legacy.c +++ b/drivers/iio/accel/cros_ec_accel_legacy.c @@ -12,6 +12,7 @@ #include <linux/delay.h> #include <linux/device.h> #include <linux/iio/buffer.h> +#include <linux/iio/common/cros_ec_sensors_core.h> #include <linux/iio/iio.h> #include <linux/iio/kfifo_buf.h> #include <linux/iio/trigger_consumer.h> @@ -25,191 +26,51 @@ #define DRV_NAME "cros-ec-accel-legacy" +#define CROS_EC_SENSOR_LEGACY_NUM 2 /* * Sensor scale hard coded at 10 bits per g, computed as: * g / (2^10 - 1) = 0.009586168; with g = 9.80665 m.s^-2 */ #define ACCEL_LEGACY_NSCALE 9586168 -/* Indices for EC sensor values. */ -enum { - X, - Y, - Z, - MAX_AXIS, -}; - -/* State data for cros_ec_accel_legacy iio driver. */ -struct cros_ec_accel_legacy_state { - struct cros_ec_device *ec; - - /* - * Array holding data from a single capture. 2 bytes per channel - * for the 3 channels plus the timestamp which is always last and - * 8-bytes aligned. - */ - s16 capture_data[8]; - s8 sign[MAX_AXIS]; - u8 sensor_num; -}; - -static int ec_cmd_read_u8(struct cros_ec_device *ec, unsigned int offset, - u8 *dest) -{ - return ec->cmd_readmem(ec, offset, 1, dest); -} - -static int ec_cmd_read_u16(struct cros_ec_device *ec, unsigned int offset, - u16 *dest) -{ - __le16 tmp; - int ret = ec->cmd_readmem(ec, offset, 2, &tmp); - - *dest = le16_to_cpu(tmp); - - return ret; -} - -/** - * read_ec_until_not_busy() - Read from EC status byte until it reads not busy. - * @st: Pointer to state information for device. - * - * This function reads EC status until its busy bit gets cleared. It does not - * wait indefinitely and returns -EIO if the EC status is still busy after a - * few hundreds milliseconds. - * - * Return: 8-bit status if ok, -EIO on error - */ -static int read_ec_until_not_busy(struct cros_ec_accel_legacy_state *st) -{ - struct cros_ec_device *ec = st->ec; - u8 status; - int attempts = 0; - - ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status); - while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) { - /* Give up after enough attempts, return error. */ - if (attempts++ >= 50) - return -EIO; - - /* Small delay every so often. */ - if (attempts % 5 == 0) - msleep(25); - - ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status); - } - - return status; -} - -/** - * read_ec_accel_data_unsafe() - Read acceleration data from EC shared memory. - * @st: Pointer to state information for device. - * @scan_mask: Bitmap of the sensor indices to scan. - * @data: Location to store data. - * - * This is the unsafe function for reading the EC data. It does not guarantee - * that the EC will not modify the data as it is being read in. - */ -static void read_ec_accel_data_unsafe(struct cros_ec_accel_legacy_state *st, - unsigned long scan_mask, s16 *data) -{ - int i = 0; - int num_enabled = bitmap_weight(&scan_mask, MAX_AXIS); - - /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */ - while (num_enabled--) { - i = find_next_bit(&scan_mask, MAX_AXIS, i); - ec_cmd_read_u16(st->ec, - EC_MEMMAP_ACC_DATA + - sizeof(s16) * - (1 + i + st->sensor_num * MAX_AXIS), - data); - *data *= st->sign[i]; - i++; - data++; - } -} - -/** - * read_ec_accel_data() - Read acceleration data from EC shared memory. - * @st: Pointer to state information for device. - * @scan_mask: Bitmap of the sensor indices to scan. - * @data: Location to store data. - * - * This is the safe function for reading the EC data. It guarantees that - * the data sampled was not modified by the EC while being read. - * - * Return: 0 if ok, -ve on error - */ -static int read_ec_accel_data(struct cros_ec_accel_legacy_state *st, - unsigned long scan_mask, s16 *data) -{ - u8 samp_id = 0xff; - u8 status = 0; - int ret; - int attempts = 0; - - /* - * Continually read all data from EC until the status byte after - * all reads reflects that the EC is not busy and the sample id - * matches the sample id from before all reads. This guarantees - * that data read in was not modified by the EC while reading. - */ - while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT | - EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) { - /* If we have tried to read too many times, return error. */ - if (attempts++ >= 5) - return -EIO; - - /* Read status byte until EC is not busy. */ - ret = read_ec_until_not_busy(st); - if (ret < 0) - return ret; - status = ret; - - /* - * Store the current sample id so that we can compare to the - * sample id after reading the data. - */ - samp_id = status & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK; - - /* Read all EC data, format it, and store it into data. */ - read_ec_accel_data_unsafe(st, scan_mask, data); - - /* Read status byte. */ - ec_cmd_read_u8(st->ec, EC_MEMMAP_ACC_STATUS, &status); - } - - return 0; -} - static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev); + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); s16 data = 0; - int ret = IIO_VAL_INT; + int ret; + int idx = chan->scan_index; + + mutex_lock(&st->cmd_lock); switch (mask) { case IIO_CHAN_INFO_RAW: - ret = read_ec_accel_data(st, (1 << chan->scan_index), &data); - if (ret) - return ret; + ret = st->read_ec_sensors_data(indio_dev, 1 << idx, &data); + if (ret < 0) + break; + ret = IIO_VAL_INT; *val = data; - return IIO_VAL_INT; + break; case IIO_CHAN_INFO_SCALE: + WARN_ON(st->type != MOTIONSENSE_TYPE_ACCEL); *val = 0; *val2 = ACCEL_LEGACY_NSCALE; - return IIO_VAL_INT_PLUS_NANO; + ret = IIO_VAL_INT_PLUS_NANO; + break; case IIO_CHAN_INFO_CALIBBIAS: /* Calibration not supported. */ *val = 0; - return IIO_VAL_INT; + ret = IIO_VAL_INT; + break; default: - return -EINVAL; + ret = cros_ec_sensors_core_read(st, chan, val, val2, + mask); + break; } + mutex_unlock(&st->cmd_lock); + + return ret; } static int cros_ec_accel_legacy_write(struct iio_dev *indio_dev, @@ -231,86 +92,14 @@ static const struct iio_info cros_ec_accel_legacy_info = { .write_raw = &cros_ec_accel_legacy_write, }; -/** - * cros_ec_accel_legacy_capture() - The trigger handler function - * @irq: The interrupt number. - * @p: Private data - always a pointer to the poll func. - * - * On a trigger event occurring, if the pollfunc is attached then this - * handler is called as a threaded interrupt (and hence may sleep). It - * is responsible for grabbing data from the device and pushing it into - * the associated buffer. - * - * Return: IRQ_HANDLED +/* + * Present the channel using HTML5 standard: + * need to invert X and Y and invert some lid axis. */ -static irqreturn_t cros_ec_accel_legacy_capture(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev); - - /* Clear capture data. */ - memset(st->capture_data, 0, sizeof(st->capture_data)); - - /* - * Read data based on which channels are enabled in scan mask. Note - * that on a capture we are always reading the calibrated data. - */ - read_ec_accel_data(st, *indio_dev->active_scan_mask, st->capture_data); - - iio_push_to_buffers_with_timestamp(indio_dev, (void *)st->capture_data, - iio_get_time_ns(indio_dev)); - - /* - * Tell the core we are done with this trigger and ready for the - * next one. - */ - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -static char *cros_ec_accel_legacy_loc_strings[] = { - [MOTIONSENSE_LOC_BASE] = "base", - [MOTIONSENSE_LOC_LID] = "lid", - [MOTIONSENSE_LOC_MAX] = "unknown", -}; - -static ssize_t cros_ec_accel_legacy_loc(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%s\n", - cros_ec_accel_legacy_loc_strings[st->sensor_num + - MOTIONSENSE_LOC_BASE]); -} - -static ssize_t cros_ec_accel_legacy_id(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%d\n", st->sensor_num); -} - -static const struct iio_chan_spec_ext_info cros_ec_accel_legacy_ext_info[] = { - { - .name = "id", - .shared = IIO_SHARED_BY_ALL, - .read = cros_ec_accel_legacy_id, - }, - { - .name = "location", - .shared = IIO_SHARED_BY_ALL, - .read = cros_ec_accel_legacy_loc, - }, - { } -}; +#define CROS_EC_ACCEL_ROTATE_AXIS(_axis) \ + ((_axis) == CROS_EC_SENSOR_Z ? CROS_EC_SENSOR_Z : \ + ((_axis) == CROS_EC_SENSOR_X ? CROS_EC_SENSOR_Y : \ + CROS_EC_SENSOR_X)) #define CROS_EC_ACCEL_LEGACY_CHAN(_axis) \ { \ @@ -321,28 +110,28 @@ static const struct iio_chan_spec_ext_info cros_ec_accel_legacy_ext_info[] = { BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_CALIBBIAS), \ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE), \ - .ext_info = cros_ec_accel_legacy_ext_info, \ + .ext_info = cros_ec_sensors_ext_info, \ .scan_type = { \ .sign = 's', \ - .realbits = 16, \ - .storagebits = 16, \ + .realbits = CROS_EC_SENSOR_BITS, \ + .storagebits = CROS_EC_SENSOR_BITS, \ }, \ + .scan_index = CROS_EC_ACCEL_ROTATE_AXIS(_axis), \ } \ -static struct iio_chan_spec ec_accel_channels[] = { - CROS_EC_ACCEL_LEGACY_CHAN(X), - CROS_EC_ACCEL_LEGACY_CHAN(Y), - CROS_EC_ACCEL_LEGACY_CHAN(Z), - IIO_CHAN_SOFT_TIMESTAMP(MAX_AXIS) +static const struct iio_chan_spec cros_ec_accel_legacy_channels[] = { + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_X), + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Y), + CROS_EC_ACCEL_LEGACY_CHAN(CROS_EC_SENSOR_Z), + IIO_CHAN_SOFT_TIMESTAMP(CROS_EC_SENSOR_MAX_AXIS) }; static int cros_ec_accel_legacy_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct cros_ec_dev *ec = dev_get_drvdata(dev->parent); - struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); struct iio_dev *indio_dev; - struct cros_ec_accel_legacy_state *state; + struct cros_ec_sensors_core_state *state; int ret; if (!ec || !ec->ec_dev) { @@ -350,46 +139,29 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev) return -EINVAL; } - if (!ec->ec_dev->cmd_readmem) { - dev_warn(&pdev->dev, "EC does not support direct reads.\n"); - return -EINVAL; - } - indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state)); if (!indio_dev) return -ENOMEM; - platform_set_drvdata(pdev, indio_dev); - state = iio_priv(indio_dev); - state->ec = ec->ec_dev; - state->sensor_num = sensor_platform->sensor_num; - - indio_dev->dev.parent = dev; - indio_dev->name = pdev->name; - indio_dev->channels = ec_accel_channels; - /* - * Present the channel using HTML5 standard: - * need to invert X and Y and invert some lid axis. - */ - ec_accel_channels[X].scan_index = Y; - ec_accel_channels[Y].scan_index = X; - ec_accel_channels[Z].scan_index = Z; + ret = cros_ec_sensors_core_init(pdev, indio_dev, true); + if (ret) + return ret; - state->sign[Y] = 1; + indio_dev->info = &cros_ec_accel_legacy_info; + state = iio_priv(indio_dev); - if (state->sensor_num == MOTIONSENSE_LOC_LID) - state->sign[X] = state->sign[Z] = -1; - else - state->sign[X] = state->sign[Z] = 1; + state->read_ec_sensors_data = cros_ec_sensors_read_lpc; - indio_dev->num_channels = ARRAY_SIZE(ec_accel_channels); - indio_dev->dev.parent = &pdev->dev; - indio_dev->info = &cros_ec_accel_legacy_info; - indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = cros_ec_accel_legacy_channels; + indio_dev->num_channels = ARRAY_SIZE(cros_ec_accel_legacy_channels); + /* The lid sensor needs to be presented inverted. */ + if (state->loc == MOTIONSENSE_LOC_LID) { + state->sign[CROS_EC_SENSOR_X] = -1; + state->sign[CROS_EC_SENSOR_Z] = -1; + } ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, - cros_ec_accel_legacy_capture, - NULL); + cros_ec_sensors_capture, NULL); if (ret) return ret; |