diff options
Diffstat (limited to 'drivers/iio')
90 files changed, 2853 insertions, 1340 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..39002cb5605d 100644 --- a/drivers/iio/accel/cros_ec_accel_legacy.c +++ b/drivers/iio/accel/cros_ec_accel_legacy.c @@ -5,13 +5,14 @@ * Copyright 2017 Google, Inc * * This driver uses the memory mapper cros-ec interface to communicate - * with the Chrome OS EC about accelerometer data. + * with the Chrome OS EC about accelerometer data or older commands. * Accelerometer access is presented through iio sysfs. */ #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> @@ -25,160 +26,41 @@ #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) +static int cros_ec_accel_legacy_read_cmd(struct iio_dev *indio_dev, + unsigned long scan_mask, s16 *data) { - u8 samp_id = 0xff; - u8 status = 0; + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); int ret; - int attempts = 0; + unsigned int i; + u8 sensor_num; /* - * 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. + * Read all sensor data through a command. + * Save sensor_num, it is assumed to stay. */ - 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); + sensor_num = st->param.info.sensor_num; + st->param.cmd = MOTIONSENSE_CMD_DUMP; + st->param.dump.max_sensor_count = CROS_EC_SENSOR_LEGACY_NUM; + ret = cros_ec_motion_send_host_cmd(st, + sizeof(st->resp->dump) + CROS_EC_SENSOR_LEGACY_NUM * + sizeof(struct ec_response_motion_sensor_data)); + st->param.info.sensor_num = sensor_num; + if (ret != 0) { + dev_warn(&indio_dev->dev, "Unable to read sensor data\n"); + return ret; + } - /* Read status byte. */ - ec_cmd_read_u8(st->ec, EC_MEMMAP_ACC_STATUS, &status); + for_each_set_bit(i, &scan_mask, indio_dev->masklength) { + *data = st->resp->dump.sensor[sensor_num].data[i] * + st->sign[i]; + data++; } return 0; @@ -188,28 +70,40 @@ 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 +125,14 @@ 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 stan |