Daniel Baluta schrieb am 18.11.2014 17:47: > Minimal implementation for KMX61 6-axis accelerometer/magnetometer. It exports > raw accel/magn readings together with scale and sampling frequency. > > Datasheet will be available at: > http://www.kionix.com/6-axis-accelerometer-magnetometer/kmx61 > Finally managed to have a close look, and found a few issues. > Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxxxx> > --- > Changes since v2: > * mostly style fixes after comments received from Jonathan and Peter > * http://marc.info/?l=linux-iio&m=141564019602400&w=2 > * implemented PM runtime and PM sleep resume/suspend hooks > * introduced new parameter for kmx61_set_mode to help updating > stby bits in kmx61_data. > * use kmx6111021 instead of kmx61 for i2c_device_id. > > drivers/iio/imu/Kconfig | 9 + > drivers/iio/imu/Makefile | 2 + > drivers/iio/imu/kmx61.c | 766 +++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 777 insertions(+) > create mode 100644 drivers/iio/imu/kmx61.c > > diff --git a/drivers/iio/imu/Kconfig b/drivers/iio/imu/Kconfig > index 2b0e451..d675f43 100644 > --- a/drivers/iio/imu/Kconfig > +++ b/drivers/iio/imu/Kconfig > @@ -25,6 +25,15 @@ config ADIS16480 > Say yes here to build support for Analog Devices ADIS16375, ADIS16480, > ADIS16485, ADIS16488 inertial sensors. > > +config KMX61 > + tristate "Kionix KMX61 6-axis accelerometer and magnetometer" > + depends on I2C > + help > + Say Y here if you want to build a driver for Kionix KMX61 6-axis accelerometer > + and magnetometer. > + To compile this driver as module, choose M here: the module will be called > + kmx61. > + This help text is more than 80 characters wide and may better be wrapped a bit differently. > source "drivers/iio/imu/inv_mpu6050/Kconfig" > > endmenu > diff --git a/drivers/iio/imu/Makefile b/drivers/iio/imu/Makefile > index 114d2c1..e1e6e3d 100644 > --- a/drivers/iio/imu/Makefile > +++ b/drivers/iio/imu/Makefile > @@ -14,3 +14,5 @@ adis_lib-$(CONFIG_IIO_ADIS_LIB_BUFFER) += adis_buffer.o > obj-$(CONFIG_IIO_ADIS_LIB) += adis_lib.o > > obj-y += inv_mpu6050/ > + > +obj-$(CONFIG_KMX61) += kmx61.o > diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c > new file mode 100644 > index 0000000..f68b3ef > --- /dev/null > +++ b/drivers/iio/imu/kmx61.c > @@ -0,0 +1,766 @@ > +/* > + * KMX61 - Kionix 6-axis Accelerometer/Magnetometer > + * > + * Copyright (c) 2014, 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 KMX61 (7-bit I2C slave address 0x0E or 0x0F). > + * > + * TODO: buffer, interrupt, thresholds, acpi, temperature sensor > + * > + */ > + > +#include <linux/module.h> > +#include <linux/i2c.h> > +#include <linux/pm.h> > +#include <linux/pm_runtime.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > + > +#define KMX61_DRV_NAME "kmx61" > + > +#define KMX61_REG_WHO_AM_I 0x00 > + > +/* > + * three 16-bit accelerometer output registers for X/Y/Z axis > + * we use only XOUT_L as a base register, all other addresses > + * can be obtained by applying an offset and are provided here > + * only for clarity. > + */ > +#define KMX61_ACC_XOUT_L 0x0A > +#define KMX61_ACC_XOUT_H 0x0B > +#define KMX61_ACC_YOUT_L 0x0C > +#define KMX61_ACC_YOUT_H 0x0D > +#define KMX61_ACC_ZOUT_L 0x0E > +#define KMX61_ACC_ZOUT_H 0x0F > + > +/* > + * one 16-bit temperature output register > + */ > +#define KMX61_TEMP_L 0x10 > +#define KMX61_TEMP_H 0x11 > + > +/* > + * three 16-bit magnetometer output registers for X/Y/Z axis > + */ > +#define KMX61_MAG_XOUT_L 0x12 > +#define KMX61_MAG_XOUT_H 0x13 > +#define KMX61_MAG_YOUT_L 0x14 > +#define KMX61_MAG_YOUT_H 0x15 > +#define KMX61_MAG_ZOUT_L 0x16 > +#define KMX61_MAG_ZOUT_H 0x17 > + > +#define KMX61_REG_ODCNTL 0x2C > +#define KMX61_REG_STBY 0x29 > +#define KMX61_REG_CTRL1 0x2A > + > +#define KMX61_ACC_STBY_BIT BIT(0) > +#define KMX61_MAG_STBY_BIT BIT(1) > +#define KMX61_ACT_STBY_BIT BIT(7) > + > +#define KMX61_ALL_STBY (KMX61_ACC_STBY_BIT | KMX61_MAG_STBY_BIT) > + > +#define KMX61_REG_CTRL1_GSEL0_SHIFT 0 > +#define KMX61_REG_CTRL1_GSEL1_SHIFT 1 > +#define KMX61_REG_CTRL1_GSEL0_MASK 0x01 > +#define KMX61_REG_CTRL1_GSEL1_MASK 0x02 I don't see the benefit of separating GSEL0 and GSEL1. > + > +#define KMX61_REG_CTRL1_BIT_RES BIT(4) > + > +#define KMX61_ACC_ODR_SHIFT 0 > +#define KMX61_MAG_ODR_SHIFT 4 > +#define KMX61_ACC_ODR_MASK 0x0F > +#define KMX61_MAG_ODR_MASK 0xF0 > + > +#define KMX61_SLEEP_DELAY_MS 2000 > + > +#define KMX61_CHIP_ID 0x12 > + > +struct kmx61_data { > + struct i2c_client *client; > + > + /* serialize access to non-atomic ops, e.g set_mode */ > + struct mutex lock; > + u8 range; > + u8 odr_bits; > + > + /* standby state */ > + u8 acc_stby; > + u8 mag_stby; Why u8 instead of bool? > + > + /* power state */ > + bool acc_ps; > + bool mag_ps; > +}; > + > +enum kmx61_range { > + KMX61_RANGE_2G, > + KMX61_RANGE_4G, > + KMX61_RANGE_8G, > +}; > + > +enum kmx61_scan { > + KMX61_SCAN_ACC_X, > + KMX61_SCAN_ACC_Y, > + KMX61_SCAN_ACC_Z, > + KMX61_SCAN_TEMP, > + KMX61_SCAN_MAG_X, > + KMX61_SCAN_MAG_Y, > + KMX61_SCAN_MAG_Z, > +}; > + > +static const struct { > + u16 uscale; > + u8 gsel0; > + u8 gsel1; > +} kmx61_scale_table[] = { > + {9582, 0, 0}, > + {19163, 1, 0}, > + {38326, 0, 1}, Why not consolidate gsel0 and gsel1 to gsel? Then this could become u16 kmx61_scale[] = {9582, 19163, 38326} with gsel as index. > +}; > + > +/* KMX61 devices */ > +#define KMX61_ACC 0x01 > +#define KMX61_MAG 0x02 > + > +static const struct { > + int val; > + int val2; > + u8 odr_bits; > +} kmx61_samp_freq_table[] = { {12, 500000, 0x00}, > + {25, 0, 0x01}, > + {50, 0, 0x02}, > + {100, 0, 0x03}, > + {200, 0, 0x04}, > + {400, 0, 0x05}, > + {800, 0, 0x06}, > + {1600, 0, 0x07}, > + {0, 781000, 0x08}, > + {1, 563000, 0x09}, > + {3, 125000, 0x0A}, > + {6, 250000, 0x0B} }; > + > +static IIO_CONST_ATTR(accel_scale_available, "0.009582 0.019163 0.038326"); > +static IIO_CONST_ATTR(magn_scale_available, "0.001465"); > +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( > + "0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800"); > + > +static struct attribute *kmx61_attributes[] = { > + &iio_const_attr_accel_scale_available.dev_attr.attr, > + &iio_const_attr_magn_scale_available.dev_attr.attr, > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > + NULL, > +}; > + > +static const struct attribute_group kmx61_attribute_group = { > + .attrs = kmx61_attributes, > +}; > + > +#define KMX61_ACC_CHAN(_axis, _index) { \ > + .type = IIO_ACCEL, \ > + .modified = 1, \ > + .channel2 = IIO_MOD_ ## _axis, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ > + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ > + .address = KMX61_ACC, \ > + .scan_index = _index, \ > + .scan_type = { \ > + .sign = 's', \ > + .realbits = 12, \ > + .storagebits = 16, \ > + .shift = 4, \ > + .endianness = IIO_LE, \ > + }, \ > +} > + > +#define KMX61_MAG_CHAN(_axis, _index) { \ > + .type = IIO_MAGN, \ > + .modified = 1, \ > + .channel2 = IIO_MOD_ ## _axis, \ > + .address = KMX61_MAG, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ > + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ > + .scan_index = _index, \ > + .scan_type = { \ > + .sign = 's', \ > + .realbits = 14, \ > + .storagebits = 16, \ > + .shift = 2, \ > + .endianness = IIO_LE, \ > + }, \ > +} > + > +static const struct iio_chan_spec kmx61_channels[] = { > + KMX61_ACC_CHAN(X, KMX61_SCAN_ACC_X), > + KMX61_ACC_CHAN(Y, KMX61_SCAN_ACC_Y), > + KMX61_ACC_CHAN(Z, KMX61_SCAN_ACC_Z), > + KMX61_MAG_CHAN(X, KMX61_SCAN_MAG_X), > + KMX61_MAG_CHAN(Y, KMX61_SCAN_MAG_Y), > + KMX61_MAG_CHAN(Z, KMX61_SCAN_MAG_Z), > +}; > + > +static int kmx61_convert_freq_to_bit(int val, int val2) > +{ > + int i; > + > + for (i = 0; i < ARRAY_SIZE(kmx61_samp_freq_table); i++) > + if (val == kmx61_samp_freq_table[i].val && > + val2 == kmx61_samp_freq_table[i].val2) > + return kmx61_samp_freq_table[i].odr_bits; > + return -EINVAL; > +} > +/** Like here, the first line of the following multiline comments have one asterisk too much. > + * kmx61_set_mode() - set KMX61 device operating mode > + * @data - kmx61 device private data pointer > + * @mode - bitmask, indicating operating mode for @device > + * @device - bitmask, indicating device for which @mode needs to be set > + * @update - update stby bits stored in device's private @data > + * > + * For each sensor (accelerometer/magnetometer) there are two operating modes > + * STANDBY and OPERATION. Neither accel nor magn can be disabled independently > + * if they are both enabled. Internal sensors state is saved in acc_stby and > + * mag_stby members of driver's private @data. > + */ > +static int kmx61_set_mode(struct kmx61_data *data, u8 mode, u8 device, > + bool update) > +{ > + int ret; > + int acc_stby = -1, mag_stby = -1; > + > + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error reading reg_stby\n"); > + return ret; > + } > + if (device & KMX61_ACC) { > + if (mode & KMX61_ACC_STBY_BIT) { > + ret |= KMX61_ACC_STBY_BIT; > + acc_stby = 1; > + } else { > + ret &= ~KMX61_ACC_STBY_BIT; > + acc_stby = 0; > + } > + } > + > + if (device & KMX61_MAG) { > + if (mode & KMX61_MAG_STBY_BIT) { > + ret |= KMX61_MAG_STBY_BIT; > + mag_stby = 1; > + } else { > + ret &= ~KMX61_MAG_STBY_BIT; > + mag_stby = 0; > + } > + } > + > + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_STBY, ret); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error writing reg_stby\n"); > + return ret; > + } > + > + if (acc_stby != -1 && update) > + data->acc_stby = !!acc_stby; > + if (mag_stby != -1 && update) > + data->mag_stby = !!mag_stby; Why is there a need for double negation? > + > + return ret; Since no error occured until this point, just return 0. > +} > + > +static int kmx61_get_mode(struct kmx61_data *data, u8 *mode, u8 device) > +{ > + int ret; > + > + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error reading reg_stby\n"); > + return ret; > + } > + *mode = 0; > + > + if (device & KMX61_ACC) { > + if (ret & KMX61_ACC_STBY_BIT) > + *mode |= KMX61_ACC_STBY_BIT; > + else > + *mode &= ~KMX61_ACC_STBY_BIT; Simply: *mode |= ret & KMX61_ACC_STBY_BIT; > + } > + > + if (device & KMX61_MAG) { > + if (ret & KMX61_MAG_STBY_BIT) > + *mode |= KMX61_MAG_STBY_BIT; > + else > + *mode &= ~KMX61_MAG_STBY_BIT; Same here: *mode |= ret & KMX61_MAG_STBY_BIT; > + } > + > + return 0; > +} > + > +static int kmx61_set_odr(struct kmx61_data *data, int val, int val2, u8 device) > +{ > + int ret; > + u8 mode; > + int lodr_bits, odr_bits; > + > + ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG); > + if (ret < 0) > + return ret; > + > + lodr_bits = kmx61_convert_freq_to_bit(val, val2); > + if (lodr_bits < 0) > + return lodr_bits; > + > + /* To change ODR, accel and magn must be in STDBY */ > + ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, > + true); > + if (ret < 0) > + return ret; > + > + odr_bits = 0; > + if (device & KMX61_ACC) > + odr_bits |= lodr_bits; > + if (device & KMX61_MAG) > + odr_bits |= (lodr_bits << KMX61_MAG_ODR_SHIFT); No need for parenthesis. > + > + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_ODCNTL, > + odr_bits); > + if (ret < 0) > + return ret; > + > + ret = kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true); > + if (ret < 0) > + return ret; > + > + data->odr_bits = lodr_bits; > + > + return 0; > +} > + > +static > +int kmx61_get_odr(struct kmx61_data *data, int *val, int *val2, u8 device) Usually wrap parameters? And don't put code on line with {. > +{ int i; > + u8 lodr_bits; > + > + if (device & KMX61_ACC) > + lodr_bits = (data->odr_bits >> KMX61_ACC_ODR_SHIFT) & > + KMX61_ACC_ODR_MASK; KMX61_ACC_ODR_SHIFT is just a placebo and not used in kmx61_set_odr. Choose one way and stay consistent. > + else if (device & KMX61_MAG) > + lodr_bits = (data->odr_bits >> KMX61_MAG_ODR_SHIFT) & > + KMX61_MAG_ODR_MASK; > + else > + return -EINVAL; > + > + for (i = 0; i < ARRAY_SIZE(kmx61_samp_freq_table); i++) > + if (lodr_bits == kmx61_samp_freq_table[i].odr_bits) { > + *val = kmx61_samp_freq_table[i].val; > + *val2 = kmx61_samp_freq_table[i].val2; > + return 0; return IIO_VAL_INT_PLUS_MICRO allows you to faciliate _read_raw a bit to just return ret there. > + } > + return -EINVAL; > +} > + > +static int kmx61_set_range(struct kmx61_data *data, int range) > +{ > + int ret; > + > + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error reading reg_ctrl1\n"); > + return ret; > + } > + > + ret &= ~(KMX61_REG_CTRL1_GSEL0_MASK | KMX61_REG_CTRL1_GSEL1_MASK); > + ret |= kmx61_scale_table[range].gsel0 << KMX61_REG_CTRL1_GSEL0_SHIFT; > + ret |= kmx61_scale_table[range].gsel1 << KMX61_REG_CTRL1_GSEL1_SHIFT; > + > + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error writing reg_ctrl1\n"); > + return ret; > + } > + > + data->range = range; > + > + return 0; > +} > + > +static int kmx61_set_scale(struct kmx61_data *data, int uscale) > +{ > + int ret, i; > + u8 mode; > + > + for (i = 0; i < ARRAY_SIZE(kmx61_scale_table); i++) { > + if (kmx61_scale_table[i].uscale == uscale) { > + ret = kmx61_get_mode(data, &mode, > + KMX61_ACC | KMX61_MAG); > + if (ret < 0) > + return ret; > + > + ret = kmx61_set_mode(data, KMX61_ALL_STBY, > + KMX61_ACC | KMX61_MAG, true); > + if (ret < 0) > + return ret; > + > + ret = kmx61_set_range(data, i); > + if (ret < 0) > + return ret; > + > + return kmx61_set_mode(data, mode, > + KMX61_ACC | KMX61_MAG, true); > + } > + } > + return -EINVAL; > +} > + > +static int kmx61_chip_init(struct kmx61_data *data) > +{ > + int ret; > + > + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_WHO_AM_I); > + if (ret < 0) { > + dev_err(&data->client->dev, "Error reading who_am_i\n"); > + return ret; > + } > + > + if (ret != KMX61_CHIP_ID) { > + dev_err(&data->client->dev, > + "Wrong chip id, got %x expected %x\n", > + ret, KMX61_CHIP_ID); > + return -EINVAL; > + } > + > + /* set accel 12bit, 4g range */ > + ret = kmx61_set_range(data, KMX61_RANGE_4G); > + if (ret < 0) > + return ret; > + > + /* set acc/magn to OPERATION mode */ > + ret = kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true); Just return kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true); > + if (ret < 0) > + return ret; > + > + return 0; > +} > +/** > + * kmx61_set_power_state() - set power state for kmx61 @device > + * @data - kmx61 device private pointer > + * @on - power state to be set for @device > + * @device - bitmask indicating device for which @on state needs to be set > + * > + * Notice that when ACC power state needs to be set to ON and MAG is in > + * OPERATION then we know that kmx61_runtime_resume was already called > + * so we must set ACC OPERATION mode here. The same happens when MAG power > + * state needs to be set to ON and ACC is in OPERATION. > + */ > +static int kmx61_set_power_state(struct kmx61_data *data, bool on, u8 device) > +{ > +#ifdef CONFIG_PM_RUNTIME > + int ret; > + > + if (device & KMX61_ACC) { > + if (on && !data->acc_ps && !data->mag_stby) > + kmx61_set_mode(data, 0, KMX61_ACC, true); > + data->acc_ps = on; > + } > + if (device & KMX61_MAG) { > + if (on && !data->mag_ps && !data->acc_stby) > + kmx61_set_mode(data, 0, KMX61_MAG, true); > + data->mag_ps = on; > + } > + > + if (on) { > + ret = pm_runtime_get_sync(&data->client->dev); > + } else { > + pm_runtime_mark_last_busy(&data->client->dev); > + ret = pm_runtime_put_autosuspend(&data->client->dev); > + } > + if (ret < 0) { > + dev_err(&data->client->dev, > + "Failed: kmx61_set_power_state for %d, ret %d\n", > + on, ret); > + return ret; > + } > +#endif > + return 0; > +} > + > +static int kmx61_read_measurement(struct kmx61_data *data, int base, int offset) u8 base, u8 offset? > +{ > + int ret; > + u8 reg = base + offset * 2; > + > + ret = i2c_smbus_read_word_data(data->client, reg); > + if (ret < 0) { > + dev_err(&data->client->dev, "failed to read reg at %x\n", reg); > + return ret; This return is unnecessary. > + } > + > + return ret; > +} > + > +static int kmx61_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) Indentation of the parameters is a bit too high. > +{ > + struct kmx61_data *data = iio_priv(indio_dev); > + int ret; > + u8 base_reg; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + switch (chan->type) { > + case IIO_ACCEL: > + case IIO_MAGN: > + base_reg = KMX61_ACC_XOUT_L; > + break; > + default: > + return -EINVAL; > + } > + mutex_lock(&data->lock); > + > + kmx61_set_power_state(data, true, chan->address); > + ret = kmx61_read_measurement(data, base_reg, chan->scan_index); > + if (ret < 0) { > + kmx61_set_power_state(data, false, chan->address); > + mutex_unlock(&data->lock); > + return ret; > + } > + *val = sign_extend32(ret >> chan->scan_type.shift, > + chan->scan_type.realbits - 1); > + kmx61_set_power_state(data, false, chan->address); > + > + mutex_unlock(&data->lock); > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SCALE: > + switch (chan->type) { > + case IIO_ACCEL: > + *val = 0; > + *val2 = kmx61_scale_table[data->range].uscale; > + return IIO_VAL_INT_PLUS_MICRO; > + case IIO_MAGN: > + /* 14 bits res, 1465 microGauss per magn count */ > + *val = 0; > + *val2 = 1465; > + return IIO_VAL_INT_PLUS_MICRO; > + default: > + return -EINVAL; > + } > + case IIO_CHAN_INFO_SAMP_FREQ: > + if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN) > + return -EINVAL; > + > + mutex_lock(&data->lock); > + ret = kmx61_get_odr(data, val, val2, chan->address); > + mutex_unlock(&data->lock); Could be just return ret here, if kmx61_get_odr() returns IIO_VAL_INT_PLUS_MICRO on success and -EINVAL on error. > + if (ret) > + return -EINVAL; > + return IIO_VAL_INT_PLUS_MICRO; > + } > + return -EINVAL; > +} > + > +static int kmx61_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int val, > + int val2, long mask) Indentation of parameters is too high. > +{ > + struct kmx61_data *data = iio_priv(indio_dev); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_SAMP_FREQ: > + if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN) > + return -EINVAL; > + > + mutex_lock(&data->lock); > + ret = kmx61_set_odr(data, val, val2, chan->address); > + mutex_unlock(&data->lock); > + return ret; > + case IIO_CHAN_INFO_SCALE: > + switch (chan->type) { > + case IIO_ACCEL: > + if (val != 0) > + return -EINVAL; > + mutex_lock(&data->lock); > + ret = kmx61_set_scale(data, val2); > + mutex_unlock(&data->lock); > + return ret; > + default: > + return -EINVAL; > + } > + return ret; This won't be reached (if so, ret would not be initialized). > + default: > + return -EINVAL; > + } > + return ret; Same here. > +} > + > +static const struct iio_info kmx61_info = { > + .driver_module = THIS_MODULE, > + .read_raw = kmx61_read_raw, > + .write_raw = kmx61_write_raw, > + .attrs = &kmx61_attribute_group, > +}; > + > +static int kmx61_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct kmx61_data *data; > + struct iio_dev *indio_dev; > + int ret; > + const char *name = NULL; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + if (!indio_dev) > + return -ENOMEM; > + > + data = iio_priv(indio_dev); > + i2c_set_clientdata(client, indio_dev); > + data->client = client; > + > + if (id) > + name = id->name; > + > + indio_dev->dev.parent = &client->dev; > + indio_dev->channels = kmx61_channels; > + indio_dev->num_channels = ARRAY_SIZE(kmx61_channels); > + indio_dev->name = name; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->info = &kmx61_info; > + > + mutex_init(&data->lock); > + > + ret = kmx61_chip_init(data); > + if (ret < 0) > + return ret; > + > + ret = iio_device_register(indio_dev); > + if (ret < 0) { > + dev_err(&client->dev, "Failed to register iio device\n"); > + goto err_iio_device_register; > + } > + > + ret = pm_runtime_set_active(&client->dev); > + if (ret < 0) > + goto err_pm_runtime_set_active; > + > + pm_runtime_enable(&client->dev); > + pm_runtime_set_autosuspend_delay(&client->dev, KMX61_SLEEP_DELAY_MS); > + pm_runtime_use_autosuspend(&client->dev); > + > + return 0; > + > +err_pm_runtime_set_active: > + iio_device_unregister(indio_dev); > +err_iio_device_register: > + kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true); > + return ret; > +} > + > +static int kmx61_remove(struct i2c_client *client) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > + struct kmx61_data *data = iio_priv(indio_dev); > + int ret; > + > + pm_runtime_disable(&client->dev); > + pm_runtime_set_suspended(&client->dev); > + pm_runtime_put_noidle(&client->dev); > + > + iio_device_unregister(indio_dev); > + > + mutex_lock(&data->lock); > + ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true); > + mutex_unlock(&data->lock); > + > + return ret; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int kmx61_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct kmx61_data *data = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&data->lock); > + ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, > + false); > + mutex_unlock(&data->lock); > + > + return ret; > +} > + > +static int kmx61_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct kmx61_data *data = iio_priv(indio_dev); > + u8 stby = 0; > + > + if (data->acc_stby) > + stby |= KMX61_ACC_STBY_BIT; > + if (data->mag_stby) > + stby |= KMX61_MAG_STBY_BIT; > + > + return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true); > +} > +#endif > + > +#ifdef CONFIG_PM_RUNTIME > +static int kmx61_runtime_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct kmx61_data *data = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&data->lock); > + ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true); > + mutex_unlock(&data->lock); > + > + return ret; > +} > + > +static int kmx61_runtime_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct kmx61_data *data = iio_priv(indio_dev); > + u8 stby = 0; > + > + if (!data->acc_ps) > + stby |= KMX61_ACC_STBY_BIT; > + if (!data->mag_ps) > + stby |= KMX61_MAG_STBY_BIT; > + > + return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true); > +} > +#endif > + > +static const struct dev_pm_ops kmx61_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(kmx61_suspend, kmx61_resume) > + SET_RUNTIME_PM_OPS(kmx61_runtime_suspend, kmx61_runtime_resume, NULL) > +}; > + > +static const struct i2c_device_id kmx61_id[] = { > + {"kmx611021", 0}, > + {} > +}; > + > +MODULE_DEVICE_TABLE(i2c, kmx61_id); > + > +static struct i2c_driver kmx61_driver = { > + .driver = { > + .name = KMX61_DRV_NAME, > + .pm = &kmx61_pm_ops, > + }, > + .probe = kmx61_probe, > + .remove = kmx61_remove, > + .id_table = kmx61_id, > +}; > + > +module_i2c_driver(kmx61_driver); > + > +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@xxxxxxxxx>"); > +MODULE_DESCRIPTION("KMX61 accelerometer/magnetometer driver"); > +MODULE_LICENSE("GPL v2"); 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