diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 11:45:21 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 11:45:21 -0700 |
commit | 61e331202f1ad57ccd2f08e4cea91dccb8591809 (patch) | |
tree | fd41a36f152bb30f65f42b3f78cefb80822e053f /drivers/iio | |
parent | 936a0cd52aa5d024c583e36e2f21bf6ec2e527e4 (diff) | |
parent | 884ca45613c47efe4b0b1238f6ee677d74fe3419 (diff) |
Merge tag 'iio-for-v4.2b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
Second set of new driver, functionality and cleanups for IIO in the 4.2 cycle.
Core functionality
* i and q modifiers from quadrature channels.
* IIO_CHAN_INFO_OVERSAMPLING_RATIO added.
* High pass filter attributes added to mirror the existing low pass filter
ones.
Core cleanups
* Make IIO tools building more cross compiler friendly.
* Substantial rework of the function __iio_update_buffers to greatly simplify
a hideously evolved function.
New drivers and support
* ACPI0008 ambient light sensor driver. This one has been around a long time to
will be good to finally get it into mainline.
* Berlin SOC ADC support.
* BMC150 magnetometer. The accelerometer in the same package has been supported
for quite some time, so good to have this half as well.
* m62332 DAC driver
* MEMSIC MMC35420 magnetometer.
* ROHM BH1710 and similar ambient light sensors.
* Sensortek STK3310 light sensor.
* Sensortek STK8312 accelerometer.
* Sensortek STK8BA50 accelerometer.
* ti-adc128s052 gains support form the adc122s021 2 channel ADC.
Driver cleanups and functionality.
* Allow various drivers to compile with !GPIOLIB if COMPILE_TEST enabled.
* bmc150 - decouple trigger from buffer to allow other triggers to be used.
* bmg160 - decouple trigger from buffer to allow other triggers to be used.
Fix a trivial unused field.
* Constify a load of platform_device_id structures.
* inv_mpu6050 - device tree bindings.
* hid-sensors - fix a memory leak during probe if certain errors occur.
* ltr501 - illuminance channel derived (in an non obvious fashion) from the
intensity channels.
* ltr501 - fix a boundary check on the proximity threshold.
* mlx90614 - drop a pointless return.
* mma8452 - Debugfs register access and fix a bug that had no effect (by
coincidence)
* ti_am335x_adc - add device tree bindings for sample-delay, open-delay and
averaging. The ideal settings for these tend to be board design specific.
Diffstat (limited to 'drivers/iio')
39 files changed, 4874 insertions, 248 deletions
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 7c9a9a94a8ce..00e7bcbdbe24 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -136,4 +136,25 @@ config MMA9553 To compile this driver as a module, choose M here: the module will be called mma9553. + +config STK8312 + tristate "Sensortek STK8312 3-Axis Accelerometer Driver" + depends on I2C + help + Say yes here to get support for the Sensortek STK8312 3-axis + accelerometer. + + Choosing M will build the driver as a module. If so, the module + will be called stk8312. + +config STK8BA50 + tristate "Sensortek STK8BA50 3-Axis Accelerometer Driver" + depends on I2C + help + Say yes here to get support for the Sensortek STK8BA50 3-axis + accelerometer. + + Choosing M will build the driver as a module. If so, the module + will be called stk8ba50. + endmenu diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 99d89e46cad1..ebd2675b2a02 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -14,6 +14,9 @@ obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o obj-$(CONFIG_MMA9551) += mma9551.o obj-$(CONFIG_MMA9553) += mma9553.o +obj-$(CONFIG_STK8312) += stk8312.o +obj-$(CONFIG_STK8BA50) += stk8ba50.o + obj-$(CONFIG_IIO_SSP_SENSORS_COMMONS) += ssp_accel_sensor.o obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c index 73e87739d219..4e70f51c2370 100644 --- a/drivers/iio/accel/bmc150-accel.c +++ b/drivers/iio/accel/bmc150-accel.c @@ -196,7 +196,7 @@ struct bmc150_accel_data { u32 slope_thres; u32 range; int ev_enable_state; - int64_t timestamp, old_timestamp; + int64_t timestamp, old_timestamp; /* Only used in hw fifo mode. */ const struct bmc150_accel_chip_info *chip_info; }; @@ -1183,7 +1183,6 @@ static const struct iio_info bmc150_accel_info = { .write_event_value = bmc150_accel_write_event, .write_event_config = bmc150_accel_write_event_config, .read_event_config = bmc150_accel_read_event_config, - .validate_trigger = bmc150_accel_validate_trigger, .driver_module = THIS_MODULE, }; @@ -1222,7 +1221,7 @@ static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p) mutex_unlock(&data->mutex); iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, - data->timestamp); + pf->timestamp); err_read: iio_trigger_notify_done(indio_dev->trig); @@ -1535,6 +1534,13 @@ static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data) return ret; } +static int bmc150_accel_buffer_preenable(struct iio_dev *indio_dev) +{ + struct bmc150_accel_data *data = iio_priv(indio_dev); + + return bmc150_accel_set_power_state(data, true); +} + static int bmc150_accel_buffer_postenable(struct iio_dev *indio_dev) { struct bmc150_accel_data *data = iio_priv(indio_dev); @@ -1591,9 +1597,18 @@ out: return 0; } +static int bmc150_accel_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct bmc150_accel_data *data = iio_priv(indio_dev); + + return bmc150_accel_set_power_state(data, false); +} + static const struct iio_buffer_setup_ops bmc150_accel_buffer_ops = { + .preenable = bmc150_accel_buffer_preenable, .postenable = bmc150_accel_buffer_postenable, .predisable = bmc150_accel_buffer_predisable, + .postdisable = bmc150_accel_buffer_postdisable, }; static int bmc150_accel_probe(struct i2c_client *client, @@ -1636,6 +1651,15 @@ static int bmc150_accel_probe(struct i2c_client *client, indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &bmc150_accel_info; + ret = iio_triggered_buffer_setup(indio_dev, + &iio_pollfunc_store_time, + bmc150_accel_trigger_handler, + &bmc150_accel_buffer_ops); + if (ret < 0) { + dev_err(&client->dev, "Failed: iio triggered buffer setup\n"); + return ret; + } + if (client->irq < 0) client->irq = bmc150_accel_gpio_probe(client, data); @@ -1648,7 +1672,7 @@ static int bmc150_accel_probe(struct i2c_client *client, BMC150_ACCEL_IRQ_NAME, indio_dev); if (ret) - return ret; + goto err_buffer_cleanup; /* * Set latched mode interrupt. While certain interrupts are @@ -1661,24 +1685,14 @@ static int bmc150_accel_probe(struct i2c_client *client, BMC150_ACCEL_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_int_rst_latch\n"); - return ret; + goto err_buffer_cleanup; } bmc150_accel_interrupts_setup(indio_dev, data); ret = bmc150_accel_triggers_setup(indio_dev, data); if (ret) - return ret; - - ret = iio_triggered_buffer_setup(indio_dev, - &iio_pollfunc_store_time, - bmc150_accel_trigger_handler, - &bmc150_accel_buffer_ops); - if (ret < 0) { - dev_err(&client->dev, - "Failed: iio triggered buffer setup\n"); - goto err_trigger_unregister; - } + goto err_buffer_cleanup; if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) || i2c_check_functionality(client->adapter, @@ -1692,7 +1706,7 @@ static int bmc150_accel_probe(struct i2c_client *client, ret = iio_device_register(indio_dev); if (ret < 0) { dev_err(&client->dev, "Unable to register iio device\n"); - goto err_buffer_cleanup; + goto err_trigger_unregister; } ret = pm_runtime_set_active(&client->dev); @@ -1708,11 +1722,10 @@ static int bmc150_accel_probe(struct i2c_client *client, err_iio_unregister: iio_device_unregister(indio_dev); -err_buffer_cleanup: - if (indio_dev->pollfunc) - iio_triggered_buffer_cleanup(indio_dev); err_trigger_unregister: bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1); +err_buffer_cleanup: + iio_triggered_buffer_cleanup(indio_dev); return ret; } @@ -1730,6 +1743,8 @@ static int bmc150_accel_remove(struct i2c_client *client) bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1); + iio_triggered_buffer_cleanup(indio_dev); + mutex_lock(&data->mutex); bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 0); mutex_unlock(&data->mutex); diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c b/drivers/iio/accel/hid-sensor-accel-3d.c index 2b4fad6998c1..ab1e238d5c75 100644 --- a/drivers/iio/accel/hid-sensor-accel-3d.c +++ b/drivers/iio/accel/hid-sensor-accel-3d.c @@ -299,7 +299,6 @@ static int hid_accel_3d_probe(struct platform_device *pdev) struct iio_dev *indio_dev; struct accel_3d_state *accel_state; struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; - struct iio_chan_spec *channels; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct accel_3d_state)); @@ -320,21 +319,21 @@ static int hid_accel_3d_probe(struct platform_device *pdev) return ret; } - channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels), - GFP_KERNEL); - if (!channels) { + indio_dev->channels = kmemdup(accel_3d_channels, + sizeof(accel_3d_channels), GFP_KERNEL); + if (!indio_dev->channels) { dev_err(&pdev->dev, "failed to duplicate channels\n"); return -ENOMEM; } - ret = accel_3d_parse_report(pdev, hsdev, channels, - HID_USAGE_SENSOR_ACCEL_3D, accel_state); + ret = accel_3d_parse_report(pdev, hsdev, + (struct iio_chan_spec *)indio_dev->channels, + HID_USAGE_SENSOR_ACCEL_3D, accel_state); if (ret) { dev_err(&pdev->dev, "failed to setup attributes\n"); goto error_free_dev_mem; } - indio_dev->channels = channels; indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels); indio_dev->dev.parent = &pdev->dev; indio_dev->info = &accel_3d_info; @@ -400,7 +399,7 @@ static int hid_accel_3d_remove(struct platform_device *pdev) return 0; } -static struct platform_device_id hid_accel_3d_ids[] = { +static const struct platform_device_id hid_accel_3d_ids[] = { { /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ .name = "HID-SENSOR-200073", diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 5b80657883bb..877ce2954196 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -32,6 +32,9 @@ #define MMA8452_OFF_Z 0x31 #define MMA8452_CTRL_REG1 0x2a #define MMA8452_CTRL_REG2 0x2b +#define MMA8452_CTRL_REG2_RST BIT(6) + +#define MMA8452_MAX_REG 0x31 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) @@ -291,6 +294,28 @@ done: return IRQ_HANDLED; } +static int mma8452_reg_access_dbg(struct iio_dev *indio_dev, + unsigned reg, unsigned writeval, + unsigned *readval) +{ + int ret; + struct mma8452_data *data = iio_priv(indio_dev); + + if (reg > MMA8452_MAX_REG) + return -EINVAL; + + if (!readval) + return mma8452_change_config(data, reg, writeval); + + ret = i2c_smbus_read_byte_data(data->client, reg); + if (ret < 0) + return ret; + + *readval = ret; + + return 0; +} + #define MMA8452_CHANNEL(axis, idx) { \ .type = IIO_ACCEL, \ .modified = 1, \ @@ -330,11 +355,36 @@ static const struct iio_info mma8452_info = { .attrs = &mma8452_group, .read_raw = &mma8452_read_raw, .write_raw = &mma8452_write_raw, + .debugfs_reg_access = &mma8452_reg_access_dbg, .driver_module = THIS_MODULE, }; static const unsigned long mma8452_scan_masks[] = {0x7, 0}; +static int mma8452_reset(struct i2c_client *client) +{ + int i; + int ret; + + ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2, + MMA8452_CTRL_REG2_RST); + if (ret < 0) + return ret; + + for (i = 0; i < 10; i++) { + usleep_range(100, 200); + ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2); + if (ret == -EIO) + continue; /* I2C comm reset */ + if (ret < 0) + return ret; + if (!(ret & MMA8452_CTRL_REG2_RST)) + return 0; + } + + return -ETIMEDOUT; +} + static int mma8452_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -365,10 +415,7 @@ static int mma8452_probe(struct i2c_client *client, indio_dev->num_channels = ARRAY_SIZE(mma8452_channels); indio_dev->available_scan_masks = mma8452_scan_masks; - data->ctrl_reg1 = MMA8452_CTRL_ACTIVE | - (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT); - ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1, - data->ctrl_reg1); + ret = mma8452_reset(client); if (ret < 0) return ret; @@ -378,6 +425,13 @@ static int mma8452_probe(struct i2c_client *client, if (ret < 0) return ret; + data->ctrl_reg1 = MMA8452_CTRL_ACTIVE | + (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT); + ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1, + data->ctrl_reg1); + if (ret < 0) + return ret; + ret = iio_triggered_buffer_setup(indio_dev, NULL, mma8452_trigger_handler, NULL); if (ret < 0) diff --git a/drivers/iio/accel/stk8312.c b/drivers/iio/accel/stk8312.c new file mode 100644 index 000000000000..d211d9f3975b --- /dev/null +++ b/drivers/iio/accel/stk8312.c @@ -0,0 +1,390 @@ +/** + * Sensortek STK8312 3-Axis Accelerometer + * + * Copyright (c) 2015, Intel Corporation. + * + * This file is subject to the terms and conditions of version 2 of + * the GNU General Public License. See the file COPYING in the main + * directory of this archive for more details. + * + * IIO driver for STK8312; 7-bit I2C address: 0x3D. + */ + +#include <linux/acpi.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> + +#define STK8312_REG_XOUT 0x00 +#define STK8312_REG_YOUT 0x01 +#define STK8312_REG_ZOUT 0x02 +#define STK8312_REG_MODE 0x07 +#define STK8312_REG_STH 0x13 +#define STK8312_REG_RESET 0x20 +#define STK8312_REG_AFECTRL 0x24 +#define STK8312_REG_OTPADDR 0x3D +#define STK8312_REG_OTPDATA 0x3E +#define STK8312_REG_OTPCTRL 0x3F + +#define STK8312_MODE_ACTIVE 1 +#define STK8312_MODE_STANDBY 0 +#define STK8312_MODE_MASK 0x01 +#define STK8312_RNG_MASK 0xC0 +#define STK8312_RNG_SHIFT 6 +#define STK8312_READ_RETRIES 16 + +#define STK8312_DRIVER_NAME "stk8312" + +/* + * The accelerometer has two measurement ranges: + * + * -6g - +6g (8-bit, signed) + * -16g - +16g (8-bit, signed) + * + * scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616 + * scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311 + */ +#define STK8312_SCALE_AVAIL "0.4616 1.2311" + +static const int stk8312_scale_table[][2] = { + {0, 461600}, {1, 231100} +}; + +#define STK8312_ACCEL_CHANNEL(reg, axis) { \ + .type = IIO_ACCEL, \ + .address = reg, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ +} + +static const struct iio_chan_spec stk8312_channels[] = { + STK8312_ACCEL_CHANNEL(STK8312_REG_XOUT, X), + STK8312_ACCEL_CHANNEL(STK8312_REG_YOUT, Y), + STK8312_ACCEL_CHANNEL(STK8312_REG_ZOUT, Z), +}; + +struct stk8312_data { + struct i2c_client *client; + struct mutex lock; + int range; + u8 mode; +}; + +static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); + +static struct attribute *stk8312_attributes[] = { + &iio_const_attr_in_accel_scale_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group stk8312_attribute_group = { + .attrs = stk8312_attributes +}; + +static int stk8312_otp_init(struct stk8312_data *data) +{ + int ret; + int count = 10; + struct i2c_client *client = data->client; + + ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70); + if (ret < 0) + goto exit_err; + ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02); + if (ret < 0) + goto exit_err; + + do { + usleep_range(1000, 5000); + ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL); + if (ret < 0) + goto exit_err; + count--; + } while (!(ret & 0x80) && count > 0); + + if (count == 0) + goto exit_err; + + ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA); + if (ret < 0) + goto exit_err; + + ret = i2c_smbus_write_byte_data(data->client, + STK8312_REG_AFECTRL, ret); + if (ret < 0) + goto exit_err; + msleep(150); + + return ret; + +exit_err: + dev_err(&client->dev, "failed to initialize sensor\n"); + return ret; +} + +static int stk8312_set_mode(struct stk8312_data *data, u8 mode) +{ + int ret; + u8 masked_reg; + struct i2c_client *client = data->client; + + if (mode > 1) + return -EINVAL; + else if (mode == data->mode) + return 0; + + ret = i2c_smbus_read_byte_data(client, STK8312_REG_MODE); + if (ret < 0) { + dev_err(&client->dev, "failed to change sensor mode\n"); + return ret; + } + masked_reg = ret & (~STK8312_MODE_MASK); + masked_reg |= mode; + + ret = i2c_smbus_write_byte_data(client, + STK8312_REG_MODE, masked_reg); + if (ret < 0) { + dev_err(&client->dev, "failed to change sensor mode\n"); + return ret; + } + + data->mode = mode; + if (mode == STK8312_MODE_ACTIVE) { + /* Need to run OTP sequence before entering active mode */ + usleep_range(1000, 5000); + ret = stk8312_otp_init(data); + } + + return ret; +} + +static int stk8312_set_range(struct stk8312_data *data, u8 range) +{ + int ret; + u8 masked_reg; + u8 mode; + struct i2c_client *client = data->client; + + if (range != 1 && range != 2) + return -EINVAL; + else if (range == data->range) + return 0; + + mode = data->mode; + /* We need to go in standby mode to modify registers */ + ret = stk8312_set_mode(data, STK8312_MODE_STANDBY); + if (ret < 0) + return ret; + + ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH); + if (ret < 0) { + dev_err(&client->dev, "failed to change sensor range\n"); + return ret; + } + + masked_reg = ret & (~STK8312_RNG_MASK); + masked_reg |= range << STK8312_RNG_SHIFT; + + ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg); + if (ret < 0) + dev_err(&client->dev, "failed to change sensor range\n"); + else + data->range = range; + + return stk8312_set_mode(data, mode); +} + +static int stk8312_read_accel(struct stk8312_data *data, u8 address) +{ + int ret; + struct i2c_client *client = data->client; + + if (address > 2) + return -EINVAL; + + ret = i2c_smbus_read_byte_data(client, address); + if (ret < 0) { + dev_err(&client->dev, "register read failed\n"); + return ret; + } + + return sign_extend32(ret, 7); +} + +static int stk8312_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct stk8312_data *data = iio_priv(indio_dev); + + if (chan->type != IIO_ACCEL) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + mutex_lock(&data->lock); + *val = stk8312_read_accel(data, chan->address); + mutex_unlock(&data->lock); + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = stk8312_scale_table[data->range - 1][0]; + *val2 = stk8312_scale_table[data->range - 1][1]; + return IIO_VAL_INT_PLUS_MICRO; + } + + return -EINVAL; +} + +static int stk8312_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + int i; + int index = -1; + int ret; + struct stk8312_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++) + if (val == stk8312_scale_table[i][0] && + val2 == stk8312_scale_table[i][1]) { + index = i + 1; + break; + } + if (index < 0) + return -EINVAL; + + mutex_lock(&data->lock); + ret = stk8312_set_range(data, index); + mutex_unlock(&data->lock); + + return ret; + } + + return -EINVAL; +} + +static const struct iio_info stk8312_info = { + .driver_module = THIS_MODULE, + .read_raw = stk8312_read_raw, + .write_raw = stk8312_write_raw, + .attrs = &stk8312_attribute_group, +}; + +static int stk8312_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct iio_dev *indio_dev; + struct stk8312_data *data; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) { + dev_err(&client->dev, "iio allocation failed!\n"); + return -ENOMEM; + } + + data = iio_priv(indio_dev); + data->client = client; + i2c_set_clientdata(client, indio_dev); + mutex_init(&data->lock); + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &stk8312_info; + indio_dev->name = STK8312_DRIVER_NAME; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = stk8312_channels; + indio_dev->num_channels = ARRAY_SIZE(stk8312_channels); + + /* A software reset is recommended at power-on */ + ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00); + if (ret < 0) { + dev_err(&client->dev, "failed to reset sensor\n"); + return ret; + } + ret = stk8312_set_range(data, 1); + if (ret < 0) + return ret; + + ret = stk8312_set_mode(data, STK8312_MODE_ACTIVE); + if (ret < 0) + return ret; + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "device_register failed\n"); + stk8312_set_mode(data, STK8312_MODE_STANDBY); + } + + return ret; +} + +static int stk8312_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + + return stk8312_set_mode(iio_priv(indio_dev), STK8312_MODE_STANDBY); +} + +#ifdef CONFIG_PM_SLEEP +static int stk8312_suspend(struct device *dev) +{ + struct stk8312_data *data; + + data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + return stk8312_set_mode(data, STK8312_MODE_STANDBY); +} + +static int stk8312_resume(struct device *dev) +{ + struct stk8312_data *data; + + data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + return stk8312_set_mode(data, STK8312_MODE_ACTIVE); +} + +static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume); + +#define STK8312_PM_OPS (&stk8312_pm_ops) +#else +#define STK8312_PM_OPS NULL +#endif + +static const struct i2c_device_id stk8312_i2c_id[] = { + {"STK8312", 0}, + {} +}; + +static const struct acpi_device_id stk8312_acpi_id[] = { + {"STK8312", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id); + +static struct i2c_driver stk8312_driver = { + .driver = { + .name = "stk8312", + .pm = STK8312_PM_OPS, + .acpi_match_table = ACPI_PTR(stk8312_acpi_id), + }, + .probe = stk8312_probe, + .remove = stk8312_remove, + .id_table = stk8312_i2c_id, +}; + +module_i2c_driver(stk8312_driver); + +MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>"); +MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/accel/stk8ba50.c b/drivers/iio/accel/stk8ba50.c new file mode 100644 index 000000000000..30950c6b36de --- /dev/null +++ b/drivers/iio/accel/stk8ba50.c @@ -0,0 +1,302 @@ +/** + * Sensortek STK8BA50 3-Axis Accelerometer + * + * Copyright (c) 2015, Intel Corporation. + * + * This file is subject to the terms and conditions of version 2 of + * the GNU General Public License. See the file COPYING in the main + * directory of this archive for more details. + * + * STK8BA50 7-bit I2C address: 0x18. + */ + +#include <linux/acpi.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> + +#define STK8BA50_REG_XOUT 0x02 +#define STK8BA50_REG_YOUT 0x04 +#define STK8BA50_REG_ZOUT 0x06 +#define STK8BA50_REG_RANGE 0x0F +#define STK8BA50_REG_POWMODE 0x11 +#define STK8BA50_REG_SWRST 0x14 + +#define STK8BA50_MODE_NORMAL 0 +#define STK8BA50_MODE_SUSPEND 1 +#define STK8BA50_MODE_POWERBIT BIT(7) +#define STK8BA50_DATA_SHIFT 6 +#define STK8BA50_RESET_CMD 0xB6 + +#define STK8BA50_DRIVER_NAME "stk8ba50" + +#define STK8BA50_SCALE_AVAIL "0.0384 0.0767 0.1534 0.3069" + +/* + * The accelerometer has four measurement ranges: + * +/-2g; +/-4g; +/-8g; +/-16g + * + * Acceleration values are 10-bit, 2's complement. + * Scales are calculated as following: + * + * scale1 = (2 + 2) * 9.81 / (2^10 - 1) = 0.0384 + * scale2 = (4 + 4) * 9.81 / (2^10 - 1) = 0.0767 + * etc. + * + * Scales are stored in this format: + |