diff options
Diffstat (limited to 'drivers/iio/imu/kmx61.c')
| -rw-r--r-- | drivers/iio/imu/kmx61.c | 1545 |
1 files changed, 1545 insertions, 0 deletions
diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c new file mode 100644 index 000000000..44b3f5397 --- /dev/null +++ b/drivers/iio/imu/kmx61.c @@ -0,0 +1,1545 @@ +/* + * 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). + * + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/acpi.h> +#include <linux/interrupt.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> +#include <linux/iio/trigger.h> +#include <linux/iio/buffer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/trigger_consumer.h> + +#define KMX61_DRV_NAME "kmx61" +#define KMX61_IRQ_NAME "kmx61_event" + +#define KMX61_REG_WHO_AM_I 0x00 +#define KMX61_REG_INS1 0x01 +#define KMX61_REG_INS2 0x02 + +/* + * 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_INL 0x28 +#define KMX61_REG_STBY 0x29 +#define KMX61_REG_CTRL1 0x2A +#define KMX61_REG_CTRL2 0x2B +#define KMX61_REG_ODCNTL 0x2C +#define KMX61_REG_INC1 0x2D + +#define KMX61_REG_WUF_THRESH 0x3D +#define KMX61_REG_WUF_TIMER 0x3E + +#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_INS1_BIT_WUFS BIT(1) + +#define KMX61_REG_INS2_BIT_ZP BIT(0) +#define KMX61_REG_INS2_BIT_ZN BIT(1) +#define KMX61_REG_INS2_BIT_YP BIT(2) +#define KMX61_REG_INS2_BIT_YN BIT(3) +#define KMX61_REG_INS2_BIT_XP BIT(4) +#define KMX61_REG_INS2_BIT_XN BIT(5) + +#define KMX61_REG_CTRL1_GSEL_MASK 0x03 + +#define KMX61_REG_CTRL1_BIT_RES BIT(4) +#define KMX61_REG_CTRL1_BIT_DRDYE BIT(5) +#define KMX61_REG_CTRL1_BIT_WUFE BIT(6) +#define KMX61_REG_CTRL1_BIT_BTSE BIT(7) + +#define KMX61_REG_INC1_BIT_WUFS BIT(0) +#define KMX61_REG_INC1_BIT_DRDYM BIT(1) +#define KMX61_REG_INC1_BIT_DRDYA BIT(2) +#define KMX61_REG_INC1_BIT_IEN BIT(5) + +#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_OWUF_MASK 0x7 + +#define KMX61_DEFAULT_WAKE_THRESH 1 +#define KMX61_DEFAULT_WAKE_DURATION 1 + +#define KMX61_SLEEP_DELAY_MS 2000 + +#define KMX61_CHIP_ID 0x12 + +/* KMX61 devices */ +#define KMX61_ACC 0x01 +#define KMX61_MAG 0x02 + +struct kmx61_data { + struct i2c_client *client; + + /* serialize access to non-atomic ops, e.g set_mode */ + struct mutex lock; + + /* standby state */ + bool acc_stby; + bool mag_stby; + + /* power state */ + bool acc_ps; + bool mag_ps; + + /* config bits */ + u8 range; + u8 odr_bits; + u8 wake_thresh; + u8 wake_duration; + + /* accelerometer specific data */ + struct iio_dev *acc_indio_dev; + struct iio_trigger *acc_dready_trig; + struct iio_trigger *motion_trig; + bool acc_dready_trig_on; + bool motion_trig_on; + bool ev_enable_state; + + /* magnetometer specific data */ + struct iio_dev *mag_indio_dev; + struct iio_trigger *mag_dready_trig; + bool mag_dready_trig_on; +}; + +enum kmx61_range { + KMX61_RANGE_2G, + KMX61_RANGE_4G, + KMX61_RANGE_8G, +}; + +enum kmx61_axis { + KMX61_AXIS_X, + KMX61_AXIS_Y, + KMX61_AXIS_Z, +}; + +static const u16 kmx61_uscale_table[] = {9582, 19163, 38326}; + +static const struct { + int val; + int val2; +} kmx61_samp_freq_table[] = { {12, 500000}, + {25, 0}, + {50, 0}, + {100, 0}, + {200, 0}, + {400, 0}, + {800, 0}, + {1600, 0}, + {0, 781000}, + {1, 563000}, + {3, 125000}, + {6, 250000} }; + +static const struct { + int val; + int val2; + int odr_bits; +} kmx61_wake_up_odr_table[] = { {0, 781000, 0x00}, + {1, 563000, 0x01}, + {3, 125000, 0x02}, + {6, 250000, 0x03}, + {12, 500000, 0x04}, + {25, 0, 0x05}, + {50, 0, 0x06}, + {100, 0, 0x06}, + {200, 0, 0x06}, + {400, 0, 0x06}, + {800, 0, 0x06}, + {1600, 0, 0x06} }; + +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_acc_attributes[] = { + &iio_const_attr_accel_scale_available.dev_attr.attr, + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + NULL, +}; + +static struct attribute *kmx61_mag_attributes[] = { + &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_acc_attribute_group = { + .attrs = kmx61_acc_attributes, +}; + +static const struct attribute_group kmx61_mag_attribute_group = { + .attrs = kmx61_mag_attributes, +}; + +static const struct iio_event_spec kmx61_event = { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_PERIOD), +}; + +#define KMX61_ACC_CHAN(_axis) { \ + .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 = KMX61_AXIS_ ## _axis, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .shift = 4, \ + .endianness = IIO_LE, \ + }, \ + .event_spec = &kmx61_event, \ + .num_event_specs = 1 \ +} + +#define KMX61_MAG_CHAN(_axis) { \ + .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 = KMX61_AXIS_ ## _axis, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 14, \ + .storagebits = 16, \ + .shift = 2, \ + .endianness = IIO_LE, \ + }, \ +} + +static const struct iio_chan_spec kmx61_acc_channels[] = { + KMX61_ACC_CHAN(X), + KMX61_ACC_CHAN(Y), + KMX61_ACC_CHAN(Z), +}; + +static const struct iio_chan_spec kmx61_mag_channels[] = { + KMX61_MAG_CHAN(X), + KMX61_MAG_CHAN(Y), + KMX61_MAG_CHAN(Z), +}; + +static void kmx61_set_data(struct iio_dev *indio_dev, struct kmx61_data *data) +{ + struct kmx61_data **priv = iio_priv(indio_dev); + + *priv = data; +} + +static struct kmx61_data *kmx61_get_data(struct iio_dev *indio_dev) +{ + return *(struct kmx61_data **)iio_priv(indio_dev); +} + +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 i; + return -EINVAL; +} + +static int kmx61_convert_wake_up_odr_to_bit(int val, int val2) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(kmx61_wake_up_odr_table); ++i) + if (kmx61_wake_up_odr_table[i].val == val && + kmx61_wake_up_odr_table[i].val2 == val2) + return kmx61_wake_up_odr_table[i].odr_bits; + return -EINVAL; +} + +/** + * 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; + } + } + + if (mode & KMX61_ACT_STBY_BIT) + ret |= KMX61_ACT_STBY_BIT; + + 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; + + 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; + } + + if (device & KMX61_MAG) { + if (ret & KMX61_MAG_STBY_BIT) + *mode |= KMX61_MAG_STBY_BIT; + else + *mode &= ~KMX61_MAG_STBY_BIT; + } + + return 0; +} + +static int kmx61_set_wake_up_odr(struct kmx61_data *data, int val, int val2) +{ + int ret, odr_bits; + + odr_bits = kmx61_convert_wake_up_odr_to_bit(val, val2); + if (odr_bits < 0) + return odr_bits; + + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL2, + odr_bits); + if (ret < 0) + dev_err(&data->client->dev, "Error writing reg_ctrl2\n"); + return ret; +} + +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 << KMX61_ACC_ODR_SHIFT; + if (device & KMX61_MAG) + odr_bits |= lodr_bits << KMX61_MAG_ODR_SHIFT; + + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_ODCNTL, + odr_bits); + if (ret < 0) + return ret; + + data->odr_bits = odr_bits; + + if (device & KMX61_ACC) { + ret = kmx61_set_wake_up_odr(data, val, val2); + if (ret) + return ret; + } + + return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true); +} + +static int kmx61_get_odr(struct kmx61_data *data, int *val, int *val2, + u8 device) +{ + u8 lodr_bits; + + if (device & KMX61_ACC) + lodr_bits = (data->odr_bits >> KMX61_ACC_ODR_SHIFT) & + KMX61_ACC_ODR_MASK; + else if (device & KMX61_MAG) + lodr_bits = (data->odr_bits >> KMX61_MAG_ODR_SHIFT) & + KMX61_MAG_ODR_MASK; + else + return -EINVAL; + + if (lodr_bits >= ARRAY_SIZE(kmx61_samp_freq_table)) + return -EINVAL; + + *val = kmx61_samp_freq_table[lodr_bits].val; + *val2 = kmx61_samp_freq_table[lodr_bits].val2; + + return 0; +} + +static int kmx61_set_range(struct kmx61_data *data, u8 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_GSEL_MASK; + ret |= range & KMX61_REG_CTRL1_GSEL_MASK; + + 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, u16 uscale) +{ + int ret, i; + u8 mode; + + for (i = 0; i < ARRAY_SIZE(kmx61_uscale_table); i++) { + if (kmx61_uscale_table[i] == 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, val, val2; + + 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; + + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_ODCNTL); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_odcntl\n"); + return ret; + } + data->odr_bits = ret; + + /* + * set output data rate for wake up (motion detection) function + * to match data rate for accelerometer sampling + */ + ret = kmx61_get_odr(data, &val, &val2, KMX61_ACC); + if (ret < 0) + return ret; + + ret = kmx61_set_wake_up_odr(data, val, val2); + if (ret < 0) + return ret; + + /* set acc/magn to OPERATION mode */ + ret = kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true); + if (ret < 0) + return ret; + + data->wake_thresh = KMX61_DEFAULT_WAKE_THRESH; + data->wake_duration = KMX61_DEFAULT_WAKE_DURATION; + + return 0; +} + +static int kmx61_setup_new_data_interrupt(struct kmx61_data *data, + bool status, u8 device) +{ + u8 mode; + int ret; + + 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 = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_ctrl1\n"); + return ret; + } + + if (status) { + ret |= KMX61_REG_INC1_BIT_IEN; + if (device & KMX61_ACC) + ret |= KMX61_REG_INC1_BIT_DRDYA; + if (device & KMX61_MAG) + ret |= KMX61_REG_INC1_BIT_DRDYM; + } else { + ret &= ~KMX61_REG_INC1_BIT_IEN; + if (device & KMX61_ACC) + ret &= ~KMX61_REG_INC1_BIT_DRDYA; + if (device & KMX61_MAG) + ret &= ~KMX61_REG_INC1_BIT_DRDYM; + } + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret); + if (ret < 0) { + dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n"); + return 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; + } + + if (status) + ret |= KMX61_REG_CTRL1_BIT_DRDYE; + else + ret &= ~KMX61_REG_CTRL1_BIT_DRDYE; + + 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; + } + + return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true); +} + +static int kmx61_chip_update_thresholds(struct kmx61_data *data) +{ + int ret; + + ret = i2c_smbus_write_byte_data(data->client, + KMX61_REG_WUF_TIMER, + data->wake_duration); + if (ret < 0) { + dev_err(&data->client->dev, "Errow writing reg_wuf_timer\n"); + return ret; + } + + ret = i2c_smbus_write_byte_data(data->client, + KMX61_REG_WUF_THRESH, + data->wake_thresh); + if (ret < 0) + dev_err(&data->client->dev, "Error writing reg_wuf_thresh\n"); + + return ret; +} + +static int kmx61_setup_any_motion_interrupt(struct kmx61_data *data, + bool status) +{ + u8 mode; + int ret; + + 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_chip_update_thresholds(data); + if (ret < 0) + return ret; + + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_inc1\n"); + return ret; + } + if (status) + ret |= (KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS); + else + ret &= ~(KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS); + + ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret); + if (ret < 0) { + dev_err(&data->client->dev, "Error writing reg_inc1\n"); + return 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; + } + + if (status) + ret |= KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE; + else + ret &= ~(KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE); + + 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; + } + mode |= KMX61_ACT_STBY_BIT; + return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true); +} + +/** + * 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 + int ret; + + if (device & KMX61_ACC) { + if (on && !data->acc_ps && !data->mag_stby) { + ret = kmx61_set_mode(data, 0, KMX61_ACC, true); + if (ret < 0) + return ret; + } + data->acc_ps = on; + } + if (device & KMX61_MAG) { + if (on && !data->mag_ps && !data->acc_stby) { + ret = kmx61_set_mode(data, 0, KMX61_MAG, true); + if (ret < 0) + return ret; + } + 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); + if (on) + pm_runtime_put_noidle(&data->client->dev); + + return ret; + } +#endif + return 0; +} + +static int kmx61_read_measurement(struct kmx61_data *data, 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; +} + +static int kmx61_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret; + u8 base_reg; + struct kmx61_data *data = kmx61_get_data(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_ACCEL: + base_reg = KMX61_ACC_XOUT_L; + break; + case IIO_MAGN: + base_reg = KMX61_MAG_XOUT_L; + break; + default: + return -EINVAL; + } + mutex_lock(&data->lock); + + ret = kmx61_set_power_state(data, true, chan->address); + if (ret) { + mutex_unlock(&data->lock); + return ret; + } + + 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); + ret = kmx61_set_power_state(data, false, chan->address); + + mutex_unlock(&data->lock); + if (ret) + return ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_ACCEL: + *val = 0; + *val2 = kmx61_uscale_table[data->range]; + 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); + 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) +{ + int ret; + struct kmx61_data *data = kmx61_get_data(indio_dev); + + 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; + } + default: + return -EINVAL; + } +} + +static int kmx61_read_event(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + + *val2 = 0; + switch (info) { + case IIO_EV_INFO_VALUE: + *val = data->wake_thresh; + return IIO_VAL_INT; + case IIO_EV_INFO_PERIOD: + *val = data->wake_duration; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int kmx61_write_event(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + + if (data->ev_enable_state) + return -EBUSY; + + switch (info) { + case IIO_EV_INFO_VALUE: + data->wake_thresh = val; + return IIO_VAL_INT; + case IIO_EV_INFO_PERIOD: + data->wake_duration = val; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int kmx61_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + + return data->ev_enable_state; +} + +static int kmx61_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + int state) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + int ret = 0; + + if (state && data->ev_enable_state) + return 0; + + mutex_lock(&data->lock); + + if (!state && data->motion_trig_on) { + data->ev_enable_state = false; + goto err_unlock; + } + + ret = kmx61_set_power_state(data, state, KMX61_ACC); + if (ret < 0) + goto err_unlock; + + ret = kmx61_setup_any_motion_interrupt(data, state); + if (ret < 0) { + kmx61_set_power_state(data, false, KMX61_ACC); + goto err_unlock; + } + + data->ev_enable_state = state; + +err_unlock: + mutex_unlock(&data->lock); + + return ret; +} + +static int kmx61_acc_validate_trigger(struct iio_dev *indio_dev, + struct iio_trigger *trig) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + + if (data->acc_dready_trig != trig && data->motion_trig != trig) + return -EINVAL; + + return 0; +} + +static int kmx61_mag_validate_trigger(struct iio_dev *indio_dev, + struct iio_trigger *trig) +{ + struct kmx61_data *data = kmx61_get_data(indio_dev); + + if (data->mag_dready_trig != trig) + return -EINVAL; + + return 0; +} + +static const struct iio_info kmx61_acc_info = { + .read_raw = kmx61_read_raw, + .write_raw = kmx61_write_raw, + .attrs = &kmx61_acc_attribute_group, + .read_event_value = kmx61_read_event, + .write_event_value = kmx61_write_event, + .read_event_config = kmx61_read_event_config, + .write_event_config = kmx61_write_event_config, + .validate_trigger = kmx61_acc_validate_trigger, +}; + +static const struct iio_info kmx61_mag_info = { + .read_raw = kmx61_read_raw, + .write_raw = kmx61_write_raw, + .attrs = &kmx61_mag_attribute_group, + .validate_trigger = kmx61_mag_validate_trigger, +}; + + +static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig, + bool state) +{ + int ret = 0; + u8 device; + + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct kmx61_data *data = kmx61_get_data(indio_dev); + + mutex_lock(&data->lock); + + if (!state && data->ev_enable_state && data->motion_trig_on) { + data->motion_trig_on = false; + goto err_unlock; + } + + if (data->acc_dready_trig == trig || data->motion_trig == trig) + device = KMX61_ACC; + else + device = KMX61_MAG; + + ret = kmx61_set_power_state(data, state, device); + if (ret < 0) + goto err_unlock; + + if (data->acc_dready_trig == trig || data->mag_dready_trig == trig) + ret = kmx61_setup_new_data_interrupt(data, state, device); + else + ret = kmx61_setup_any_motion_interrupt(data, state); + if (ret < 0) { + kmx61_set_power_state(data, false, device); + goto err_unlock; + } + + if (data->acc_dready_trig == trig) + data->acc_dready_trig_on = state; + else if (data->mag_dready_trig == trig) + data->mag_dready_trig_on = state; + else + data->motion_trig_on = state; +err_unlock: + mutex_unlock(&data->lock); + + return ret; +} + +static int kmx61_trig_try_reenable(struct iio_trigger *trig) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct kmx61_data *data = kmx61_get_data(indio_dev); + int ret; + + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_inl\n"); + return ret; + } + + return 0; +} + +static const struct iio_trigger_ops kmx61_trigger_ops = { + .set_trigger_state = kmx61_data_rdy_trigger_set_state, + .try_reenable = kmx61_trig_try_reenable, +}; + +static irqreturn_t kmx61_event_handler(int irq, void *private) +{ + struct kmx61_data *data = private; + struct iio_dev *indio_dev = data->acc_indio_dev; + int ret; + + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS1); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_ins1\n"); + goto ack_intr; + } + + if (ret & KMX61_REG_INS1_BIT_WUFS) { + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS2); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_ins2\n"); + goto ack_intr; + } + + if (ret & KMX61_REG_INS2_BIT_XN) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_X, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + 0); + + if (ret & KMX61_REG_INS2_BIT_XP) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_X, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + 0); + + if (ret & KMX61_REG_INS2_BIT_YN) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_Y, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + 0); + + if (ret & KMX61_REG_INS2_BIT_YP) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_Y, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + 0); + + if (ret & KMX61_REG_INS2_BIT_ZN) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_Z, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + 0); + + if (ret & KMX61_REG_INS2_BIT_ZP) + iio_push_event(indio_dev, + IIO_MOD_EVENT_CODE(IIO_ACCEL, + 0, + IIO_MOD_Z, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + 0); + } + +ack_intr: + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1); + if (ret < 0) + dev_err(&data->client->dev, "Error reading reg_ctrl1\n"); + + ret |= KMX61_REG_CTRL1_BIT_RES; + 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"); + + ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL); + if (ret < 0) + dev_err(&data->client->dev, "Error reading reg_inl\n"); + + return IRQ_HANDLED; +} + +static irqreturn_t kmx61_data_rdy_trig_poll(int irq, void *private) +{ + struct kmx61_data *data = private; + + if (data->acc_dready_trig_on) + iio_trigger_poll(data->acc_dready_trig); + if (data->mag_dready_trig_on) + iio_trigger_poll(data->mag_dready_trig); + + if (data->motion_trig_on) + iio_trigger_poll(data->motion_trig); + + if (data->ev_enable_state) + return IRQ_WAKE_THREAD; + return IRQ_HANDLED; +} + +static irqreturn_t kmx61_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct kmx61_data *data = kmx61_get_data(indio_dev); + int bit, ret, i = 0; + u8 base; + s16 buffer[8]; + + if (indio_dev == data->acc_indio_dev) + base = KMX61_ACC_XOUT_L; + else + base = KMX61_MAG_XOUT_L; + + mutex_lock(&data->lock); + for_each_set_bit(bit, indio_dev->active_scan_mask, + indio_dev->masklength) { + ret = kmx61_read_measurement(data, base, bit); + if (ret < 0) { + mutex_unlock(&data->lock); + goto err; + } + buffer[i++] = ret; + } + mutex_unlock(&data->lock); + + iio_push_to_buffers(indio_dev, buffer); +err: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static const char *kmx61_match_acpi_device(struct device *dev) +{ + const struct acpi_device_id *id; + + id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!id) + return NULL; + return dev_name(dev); +} + +static struct iio_dev *kmx61_indiodev_setup(struct kmx61_data *data, + const struct iio_info *info, + const struct iio_chan_spec *chan, + int num_channels, + const char *name) +{ + struct iio_dev *indio_dev; + + indio_dev = devm_iio_device_alloc(&data->client->dev, sizeof(data)); + if (!indio_dev) + return ERR_PTR(-ENOMEM); + + kmx61_set_data(indio_dev, data); + + indio_dev->dev.parent = &data->client->dev; + indio_dev->channels = chan; + indio_dev->num_channels = num_channels; + indio_dev->name = name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = info; + + return indio_dev; +} + +static struct iio_trigger *kmx61_trigger_setup(struct kmx61_data *data, + struct iio_dev *indio_dev, + const char *tag) +{ + struct iio_trigger *trig; + int ret; + + trig = devm_iio_trigger_alloc(&data->client->dev, + "%s-%s-dev%d", + indio_dev->name, + tag, + indio_dev->id); + if (!trig) + return ERR_PTR(-ENOMEM); + + trig->dev.parent = &data->client->dev; + trig->ops = &kmx61_trigger_ops; + iio_trigger_set_drvdata(trig, indio_dev); + + ret = iio_trigger_register(trig); + if (ret) + return ERR_PTR(ret); + + return trig; +} + +static int kmx61_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct kmx61_data *data; + const char *name = NULL; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + data->client = client; + + mutex_init(&data->lock); + + if (id) + name = id->name; + else if (ACPI_HANDLE(&client->dev)) + name = kmx61_match_acpi_device(&client->dev); + else + return -ENODEV; + + data->acc_indio_dev = + kmx61_indiodev_setup(data, &kmx61_acc_info, + kmx61_acc_channels, + ARRAY_SIZE(kmx61_acc_channels), + name); + if (IS_ERR(data->acc_indio_dev)) + return PTR_ERR(data->acc_indio_dev); + + data->mag_indio_dev = + kmx61_indiodev_setup(data, &kmx61_mag_info, + kmx61_mag_channels, + ARRAY_SIZE(kmx61_mag_channels), + name); + if (IS_ERR(data->mag_indio_dev)) + return PTR_ERR(data->mag_indio_dev); + + ret = kmx61_chip_init(data); + if (ret < 0) + return ret; + + if (client->irq > 0) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + kmx61_data_rdy_trig_poll, + kmx61_event_handler, + IRQF_TRIGGER_RISING, + KMX61_IRQ_NAME, + data); + if (ret) + goto err_chip_uninit; + + data->acc_dready_trig = + kmx61_trigger_setup(data, data->acc_indio_dev, + "dready"); + if (IS_ERR(data->acc_dready_trig)) { + ret = PTR_ERR(data->acc_dready_trig); + goto err_chip_uninit; + } + + data->mag_dready_trig = + kmx61_trigger_setup(data, data->mag_indio_dev, + "dready"); + if (IS_ERR(data->mag_dready_trig)) { + ret = PTR_ERR(data->mag_dready_trig); + goto err_trigger_unregister_acc_dready; + } + + data->motion_trig = + kmx61_trigger_setup(data, data->acc_indio_dev, + "any-motion"); + if (IS_ERR(data->motion_trig)) { + ret = PTR_ERR(data->motion_trig); + goto err_trigger_unregister_mag_dready; + } + + ret = iio_triggered_buffer_setup(data->acc_indio_dev, + &iio_pollfunc_store_time, + kmx61_trigger_handler, + NULL); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to setup acc triggered buffer\n"); + goto err_trigger_unregister_motion; + } + + ret = iio_triggered_buffer_setup(data->mag_indio_dev, + &iio_pollfunc_store_time, + kmx61_trigger_handler, + NULL); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to setup mag triggered buffer\n"); + goto err_buffer_cleanup_acc; + } + } + + ret = pm_runtime_set_active(&client->dev); + if (ret < 0) + goto err_buffer_cleanup_mag; + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, KMX61_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(&client->dev); + + ret = iio_device_register(data->acc_indio_dev); + if (ret < 0) { + dev_err(&client->dev, "Failed to register acc iio device\n"); + goto err_buffer_cleanup_mag; + } + + ret = iio_device_register(data->mag_indio_dev); + if (ret < 0) { + dev_err(&client->dev, "Failed to register mag iio device\n"); + goto err_iio_unregister_acc; + } + + return 0; + +err_iio_unregister_acc: + iio_device_unregister(data->acc_indio_dev); +err_buffer_cleanup_mag: + if (client->irq > 0) + iio_triggered_buffer_cleanup(data->mag_indio_dev); +err_buffer_cleanup_acc: + if (client->irq > 0) + iio_triggered_buffer_cleanup(data->acc_indio_dev); +err_trigger_unregister_motion: + iio_trigger_unregister(data->motion_trig); +err_trigger_unregister_mag_dready: + iio_trigger_unregister(data->mag_dready_trig); +err_trigger_unregister_acc_dready: + iio_trigger_unregister(data->acc_dready_trig); +err_chip_uninit: + kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true); + return ret; +} + +static int kmx61_remove(struct i2c_client *client) +{ + struct kmx61_data *data = i2c_get_clientdata(client); + + iio_device_unregister(data->acc_indio_dev); + iio_device_unregister(data->mag_indio_dev); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + pm_runtime_put_noidle(&client->dev); + + if (client->irq > 0) { + iio_triggered_buffer_cleanup(data->acc_indio_dev); + iio_triggered_buffer_cleanup(data->mag_indio_dev); + iio_trigger_unregister(data->acc_dready_trig); + iio_trigger_unregister(data->mag_dready_trig); + iio_trigger_unregister(data->motion_trig); + } + + mutex_lock(&data->lock); + kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true); + mutex_unlock(&data->lock); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int kmx61_suspend(struct device *dev) +{ + int ret; + struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + 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) +{ + u8 stby = 0; + struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + 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 +static int kmx61_runtime_suspend(struct device *dev) +{ + struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(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 kmx61_data *data = i2c_get_clientdata(to_i2c_client(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 acpi_device_id kmx61_acpi_match[] = { + {"KMX61021", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, kmx61_acpi_match); + +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, + .acpi_match_table = ACPI_PTR(kmx61_acpi_match), + .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@intel.com>"); +MODULE_DESCRIPTION("KMX61 accelerometer/magnetometer driver"); +MODULE_LICENSE("GPL v2"); |