--- /dev/null
+/*
+ * BMC150 3-axis accelerometer driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define BMC150_ACCEL_DRV_NAME "bmc150_accel"
+#define BMC150_ACCEL_IRQ_NAME "bmc150_accel_event"
+#define BMC150_ACCEL_GPIO_NAME "bmc150_accel_int"
+
+#define BMC150_ACCEL_REG_CHIP_ID 0x00
+#define BMC150_ACCEL_CHIP_ID_VAL 0xFA
+
+#define BMC150_ACCEL_REG_INT_STATUS_2 0x0B
+#define BMC150_ACCEL_ANY_MOTION_MASK 0x07
+#define BMC150_ACCEL_ANY_MOTION_BIT_SIGN BIT(3)
+
+#define BMC150_ACCEL_REG_PMU_LPW 0x11
+#define BMC150_ACCEL_PMU_MODE_MASK 0xE0
+#define BMC150_ACCEL_PMU_MODE_SHIFT 5
+#define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_MASK 0x17
+#define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT 1
+
+#define BMC150_ACCEL_REG_PMU_RANGE 0x0F
+
+#define BMC150_ACCEL_DEF_RANGE_2G 0x03
+#define BMC150_ACCEL_DEF_RANGE_4G 0x05
+#define BMC150_ACCEL_DEF_RANGE_8G 0x08
+#define BMC150_ACCEL_DEF_RANGE_16G 0x0C
+
+/* Default BW: 125Hz */
+#define BMC150_ACCEL_REG_PMU_BW 0x10
+#define BMC150_ACCEL_DEF_BW 125
+
+#define BMC150_ACCEL_REG_INT_MAP_0 0x19
+#define BMC150_ACCEL_INT_MAP_0_BIT_SLOPE BIT(2)
+
+#define BMC150_ACCEL_REG_INT_MAP_1 0x1A
+#define BMC150_ACCEL_INT_MAP_1_BIT_DATA BIT(0)
+
+#define BMC150_ACCEL_REG_INT_RST_LATCH 0x21
+#define BMC150_ACCEL_INT_MODE_LATCH_RESET 0x80
+#define BMC150_ACCEL_INT_MODE_LATCH_INT 0x0F
+#define BMC150_ACCEL_INT_MODE_NON_LATCH_INT 0x00
+
+#define BMC150_ACCEL_REG_INT_EN_0 0x16
+#define BMC150_ACCEL_INT_EN_BIT_SLP_X BIT(0)
+#define BMC150_ACCEL_INT_EN_BIT_SLP_Y BIT(1)
+#define BMC150_ACCEL_INT_EN_BIT_SLP_Z BIT(2)
+
+#define BMC150_ACCEL_REG_INT_EN_1 0x17
+#define BMC150_ACCEL_INT_EN_BIT_DATA_EN BIT(4)
+
+#define BMC150_ACCEL_REG_INT_OUT_CTRL 0x20
+#define BMC150_ACCEL_INT_OUT_CTRL_INT1_LVL BIT(0)
+
+#define BMC150_ACCEL_REG_INT_5 0x27
+#define BMC150_ACCEL_SLOPE_DUR_MASK 0x03
+
+#define BMC150_ACCEL_REG_INT_6 0x28
+#define BMC150_ACCEL_SLOPE_THRES_MASK 0xFF
+
+/* Slope duration in terms of number of samples */
+#define BMC150_ACCEL_DEF_SLOPE_DURATION 2
+/* in terms of multiples of g's/LSB, based on range */
+#define BMC150_ACCEL_DEF_SLOPE_THRESHOLD 5
+
+#define BMC150_ACCEL_REG_XOUT_L 0x02
+
+#define BMC150_ACCEL_MAX_STARTUP_TIME_MS 100
+
+/* Sleep Duration values */
+#define BMC150_ACCEL_SLEEP_500_MICRO 0x05
+#define BMC150_ACCEL_SLEEP_1_MS 0x06
+#define BMC150_ACCEL_SLEEP_2_MS 0x07
+#define BMC150_ACCEL_SLEEP_4_MS 0x08
+#define BMC150_ACCEL_SLEEP_6_MS 0x09
+#define BMC150_ACCEL_SLEEP_10_MS 0x0A
+#define BMC150_ACCEL_SLEEP_25_MS 0x0B
+#define BMC150_ACCEL_SLEEP_50_MS 0x0C
+#define BMC150_ACCEL_SLEEP_100_MS 0x0D
+#define BMC150_ACCEL_SLEEP_500_MS 0x0E
+#define BMC150_ACCEL_SLEEP_1_SEC 0x0F
+
+#define BMC150_ACCEL_REG_TEMP 0x08
+#define BMC150_ACCEL_TEMP_CENTER_VAL 24
+
+#define BMC150_ACCEL_AXIS_TO_REG(axis) (BMC150_ACCEL_REG_XOUT_L + (axis * 2))
+#define BMC150_AUTO_SUSPEND_DELAY_MS 2000
+
+enum bmc150_accel_axis {
+ AXIS_X,
+ AXIS_Y,
+ AXIS_Z,
+};
+
+enum bmc150_power_modes {
+ BMC150_ACCEL_SLEEP_MODE_NORMAL,
+ BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND,
+ BMC150_ACCEL_SLEEP_MODE_LPM,
+ BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04,
+};
+
+struct bmc150_accel_data {
+ struct i2c_client *client;
+ struct iio_trigger *dready_trig;
+ struct iio_trigger *motion_trig;
+ struct mutex mutex;
+ s16 buffer[8];
+ u8 bw_bits;
+ u32 slope_dur;
+ u32 slope_thres;
+ u32 range;
+ int ev_enable_state;
+ bool dready_trigger_on;
+ bool motion_trigger_on;
+ int64_t timestamp;
+};
+
+static const struct {
+ int val;
+ int val2;
+ u8 bw_bits;
+} bmc150_accel_samp_freq_table[] = { {7, 810000, 0x08},
+ {15, 630000, 0x09},
+ {31, 250000, 0x0A},
+ {62, 500000, 0x0B},
+ {125, 0, 0x0C},
+ {250, 0, 0x0D},
+ {500, 0, 0x0E},
+ {1000, 0, 0x0F} };
+
+static const struct {
+ int bw_bits;
+ int msec;
+} bmc150_accel_sample_upd_time[] = { {0x08, 64},
+ {0x09, 32},
+ {0x0A, 16},
+ {0x0B, 8},
+ {0x0C, 4},
+ {0x0D, 2},
+ {0x0E, 1},
+ {0x0F, 1} };
+
+static const struct {
+ int scale;
+ int range;
+} bmc150_accel_scale_table[] = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
+ {19122, BMC150_ACCEL_DEF_RANGE_4G},
+ {38344, BMC150_ACCEL_DEF_RANGE_8G},
+ {77057, BMC150_ACCEL_DEF_RANGE_16G} };
+
+static const struct {
+ int sleep_dur;
+ int reg_value;
+} bmc150_accel_sleep_value_table[] = { {0, 0},
+ {500, BMC150_ACCEL_SLEEP_500_MICRO},
+ {1000, BMC150_ACCEL_SLEEP_1_MS},
+ {2000, BMC150_ACCEL_SLEEP_2_MS},
+ {4000, BMC150_ACCEL_SLEEP_4_MS},
+ {6000, BMC150_ACCEL_SLEEP_6_MS},
+ {10000, BMC150_ACCEL_SLEEP_10_MS},
+ {25000, BMC150_ACCEL_SLEEP_25_MS},
+ {50000, BMC150_ACCEL_SLEEP_50_MS},
+ {100000, BMC150_ACCEL_SLEEP_100_MS},
+ {500000, BMC150_ACCEL_SLEEP_500_MS},
+ {1000000, BMC150_ACCEL_SLEEP_1_SEC} };
+
+
+static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
+ enum bmc150_power_modes mode,
+ int dur_us)
+{
+ int i;
+ int ret;
+ u8 lpw_bits;
+ int dur_val = -1;
+
+ if (dur_us > 0) {
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_sleep_value_table);
+ ++i) {
+ if (bmc150_accel_sleep_value_table[i].sleep_dur ==
+ dur_us)
+ dur_val =
+ bmc150_accel_sleep_value_table[i].reg_value;
+ }
+ } else
+ dur_val = 0;
+
+ if (dur_val < 0)
+ return -EINVAL;
+
+ lpw_bits = mode << BMC150_ACCEL_PMU_MODE_SHIFT;
+ lpw_bits |= (dur_val << BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT);
+
+ dev_dbg(&data->client->dev, "Set Mode bits %x\n", lpw_bits);
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
+ int val2)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
+ if (bmc150_accel_samp_freq_table[i].val == val &&
+ bmc150_accel_samp_freq_table[i].val2 == val2) {
+ ret = i2c_smbus_write_byte_data(
+ data->client,
+ BMC150_ACCEL_REG_PMU_BW,
+ bmc150_accel_samp_freq_table[i].bw_bits);
+ if (ret < 0)
+ return ret;
+
+ data->bw_bits =
+ bmc150_accel_samp_freq_table[i].bw_bits;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_CHIP_ID);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error: Reading chip id\n");
+ return ret;
+ }
+
+ dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
+ if (ret != BMC150_ACCEL_CHIP_ID_VAL) {
+ dev_err(&data->client->dev, "Invalid chip %x\n", ret);
+ return -ENODEV;
+ }
+
+ ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Set Bandwidth */
+ ret = bmc150_accel_set_bw(data, BMC150_ACCEL_DEF_BW, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Set Default Range */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_PMU_RANGE,
+ BMC150_ACCEL_DEF_RANGE_4G);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_pmu_range\n");
+ return ret;
+ }
+
+ data->range = BMC150_ACCEL_DEF_RANGE_4G;
+
+ /* Set default slope duration */
+ ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_INT_5);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_int_5\n");
+ return ret;
+ }
+ data->slope_dur |= BMC150_ACCEL_DEF_SLOPE_DURATION;
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_5,
+ data->slope_dur);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_5\n");
+ return ret;
+ }
+ dev_dbg(&data->client->dev, "slope_dur %x\n", data->slope_dur);
+
+ /* Set default slope thresholds */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_6,
+ BMC150_ACCEL_DEF_SLOPE_THRESHOLD);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_6\n");
+ return ret;
+ }
+ data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD;
+ dev_dbg(&data->client->dev, "slope_thres %x\n", data->slope_thres);
+
+ /* Set default as latched interrupts */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_int_rst_latch\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_setup_any_motion_interrupt(
+ struct bmc150_accel_data *data,
+ bool status)
+{
+ int ret;
+
+ /* Enable/Disable INT1 mapping */
+ ret = i2c_smbus_read_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_MAP_0);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_int_map_0\n");
+ return ret;
+ }
+ if (status)
+ ret |= BMC150_ACCEL_INT_MAP_0_BIT_SLOPE;
+ else
+ ret &= ~BMC150_ACCEL_INT_MAP_0_BIT_SLOPE;
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_MAP_0,
+ ret);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_map_0\n");
+ return ret;
+ }
+
+ if (status) {
+ /* Set slope duration (no of samples) */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_5,
+ data->slope_dur);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error write reg_int_5\n");
+ return ret;
+ }
+
+ /* Set slope thresholds */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_6,
+ data->slope_thres);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error write reg_int_6\n");
+ return ret;
+ }
+
+ /*
+ * New data interrupt is always non-latched,
+ * which will have higher priority, so no need
+ * to set latched mode, we will be flooded anyway with INTR
+ */
+ if (!data->dready_trigger_on) {
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_int_rst_latch\n");
+ return ret;
+ }
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_EN_0,
+ BMC150_ACCEL_INT_EN_BIT_SLP_X |
+ BMC150_ACCEL_INT_EN_BIT_SLP_Y |
+ BMC150_ACCEL_INT_EN_BIT_SLP_Z);
+ } else
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_EN_0,
+ 0);
+
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_en_0\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_setup_new_data_interrupt(struct bmc150_accel_data *data,
+ bool status)
+{
+ int ret;
+
+ /* Enable/Disable INT1 mapping */
+ ret = i2c_smbus_read_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_MAP_1);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_int_map_1\n");
+ return ret;
+ }
+ if (status)
+ ret |= BMC150_ACCEL_INT_MAP_1_BIT_DATA;
+ else
+ ret &= ~BMC150_ACCEL_INT_MAP_1_BIT_DATA;
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_MAP_1,
+ ret);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_map_1\n");
+ return ret;
+ }
+
+ if (status) {
+ /*
+ * Set non latched mode interrupt and clear any latched
+ * interrupt
+ */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_NON_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_int_rst_latch\n");
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_EN_1,
+ BMC150_ACCEL_INT_EN_BIT_DATA_EN);
+
+ } else {
+ /* Restore default interrupt mode */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_int_rst_latch\n");
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_EN_1,
+ 0);
+ }
+
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error writing reg_int_en_1\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_get_bw(struct bmc150_accel_data *data, int *val,
+ int *val2)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
+ if (bmc150_accel_samp_freq_table[i].bw_bits == data->bw_bits) {
+ *val = bmc150_accel_samp_freq_table[i].val;
+ *val2 = bmc150_accel_samp_freq_table[i].val2;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int bmc150_accel_get_startup_times(struct bmc150_accel_data *data)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_sample_upd_time); ++i) {
+ if (bmc150_accel_sample_upd_time[i].bw_bits == data->bw_bits)
+ return bmc150_accel_sample_upd_time[i].msec;
+ }
+
+ return BMC150_ACCEL_MAX_STARTUP_TIME_MS;
+}
+
+static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
+{
+ int ret;
+
+ 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: bmc150_accel_set_power_state for %d\n", on);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
+{
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_scale_table); ++i) {
+ if (bmc150_accel_scale_table[i].scale == val) {
+ ret = i2c_smbus_write_byte_data(
+ data->client,
+ BMC150_ACCEL_REG_PMU_RANGE,
+ bmc150_accel_scale_table[i].range);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing pmu_range\n");
+ return ret;
+ }
+
+ data->range = bmc150_accel_scale_table[i].range;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_TEMP);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_temp\n");
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ *val = sign_extend32(ret, 7);
+
+ mutex_unlock(&data->mutex);
+
+ return IIO_VAL_INT;
+}
+
+static int bmc150_accel_get_axis(struct bmc150_accel_data *data, int axis,
+ int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = bmc150_accel_set_power_state(data, true);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+
+ ret = i2c_smbus_read_word_data(data->client,
+ BMC150_ACCEL_AXIS_TO_REG(axis));
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading axis %d\n", axis);
+ bmc150_accel_set_power_state(data, false);
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ *val = sign_extend32(ret >> 4, 11);
+ ret = bmc150_accel_set_power_state(data, false);
+ mutex_unlock(&data->mutex);
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+}
+
+static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_TEMP:
+ return bmc150_accel_get_temp(data, val);
+ case IIO_ACCEL:
+ if (iio_buffer_enabled(indio_dev))
+ return -EBUSY;
+ else
+ return bmc150_accel_get_axis(data,
+ chan->scan_index,
+ val);
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_OFFSET:
+ if (chan->type == IIO_TEMP) {
+ *val = BMC150_ACCEL_TEMP_CENTER_VAL;
+ return IIO_VAL_INT;
+ } else
+ return -EINVAL;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ switch (chan->type) {
+ case IIO_TEMP:
+ *val2 = 500000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_ACCEL:
+ {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bmc150_accel_scale_table);
+ ++i) {
+ if (bmc150_accel_scale_table[i].range ==
+ data->range) {
+ *val2 =
+ bmc150_accel_scale_table[i].scale;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ }
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ mutex_lock(&data->mutex);
+ ret = bmc150_accel_get_bw(data, val, val2);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int bmc150_accel_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ mutex_lock(&data->mutex);
+ ret = bmc150_accel_set_bw(data, val, val2);
+ mutex_unlock(&data->mutex);
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ if (val)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ ret = bmc150_accel_set_scale(data, val2);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int bmc150_accel_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 bmc150_accel_data *data = iio_priv(indio_dev);
+
+ *val2 = 0;
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ *val = data->slope_thres;
+ break;
+ case IIO_EV_INFO_PERIOD:
+ *val = data->slope_dur & BMC150_ACCEL_SLOPE_DUR_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return IIO_VAL_INT;
+}
+
+static int bmc150_accel_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 bmc150_accel_data *data = iio_priv(indio_dev);
+
+ if (data->ev_enable_state)
+ return -EBUSY;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ data->slope_thres = val;
+ break;
+ case IIO_EV_INFO_PERIOD:
+ data->slope_dur &= ~BMC150_ACCEL_SLOPE_DUR_MASK;
+ data->slope_dur |= val & BMC150_ACCEL_SLOPE_DUR_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_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 bmc150_accel_data *data = iio_priv(indio_dev);
+
+ return data->ev_enable_state;
+}
+
+static int bmc150_accel_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 bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (state && data->ev_enable_state)
+ return 0;
+
+ mutex_lock(&data->mutex);
+
+ if (!state && data->motion_trigger_on) {
+ data->ev_enable_state = 0;
+ mutex_unlock(&data->mutex);
+ return 0;
+ }
+
+ /*
+ * We will expect the enable and disable to do operation in
+ * in reverse order. This will happen here anyway as our
+ * resume operation uses sync mode runtime pm calls, the
+ * suspend operation will be delayed by autosuspend delay
+ * So the disable operation will still happen in reverse of
+ * enable operation. When runtime pm is disabled the mode
+ * is always on so sequence doesn't matter
+ */
+
+ ret = bmc150_accel_set_power_state(data, state);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+
+ ret = bmc150_accel_setup_any_motion_interrupt(data, state);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+
+ data->ev_enable_state = state;
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+static int bmc150_accel_validate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger *trig)
+{
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ if (data->dready_trig != trig && data->motion_trig != trig)
+ return -EINVAL;
+
+ return 0;
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
+ "7.810000 15.630000 31.250000 62.500000 125 250 500 1000");
+
+static struct attribute *bmc150_accel_attributes[] = {
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group bmc150_accel_attrs_group = {
+ .attrs = bmc150_accel_attributes,
+};
+
+static const struct iio_event_spec bmc150_accel_event = {
+ .type = IIO_EV_TYPE_ROC,
+ .dir = IIO_EV_DIR_RISING | IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE) |
+ BIT(IIO_EV_INFO_PERIOD)
+};
+
+#define BMC150_ACCEL_CHANNEL(_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), \
+ .scan_index = AXIS_##_axis, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 12, \
+ .storagebits = 16, \
+ .shift = 4, \
+ }, \
+ .event_spec = &bmc150_accel_event, \
+ .num_event_specs = 1 \
+}
+
+static const struct iio_chan_spec bmc150_accel_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ .scan_index = -1,
+ },
+ BMC150_ACCEL_CHANNEL(X),
+ BMC150_ACCEL_CHANNEL(Y),
+ BMC150_ACCEL_CHANNEL(Z),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static const struct iio_info bmc150_accel_info = {
+ .attrs = &bmc150_accel_attrs_group,
+ .read_raw = bmc150_accel_read_raw,
+ .write_raw = bmc150_accel_write_raw,
+ .read_event_value = bmc150_accel_read_event,
+ .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,
+};
+
+static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int bit, ret, i = 0;
+
+ mutex_lock(&data->mutex);
+ for_each_set_bit(bit, indio_dev->buffer->scan_mask,
+ indio_dev->masklength) {
+ ret = i2c_smbus_read_word_data(data->client,
+ BMC150_ACCEL_AXIS_TO_REG(bit));
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ goto err_read;
+ }
+ data->buffer[i++] = ret;
+ }
+ mutex_unlock(&data->mutex);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+ data->timestamp);
+err_read:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int bmc150_accel_trig_try_reen(struct iio_trigger *trig)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+
+ /* new data interrupts don't need ack */
+ if (data->dready_trigger_on)
+ return 0;
+
+ mutex_lock(&data->mutex);
+ /* clear any latched interrupt */
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+ mutex_unlock(&data->mutex);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Error writing reg_int_rst_latch\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int bmc150_accel_data_rdy_trigger_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ if (!state && data->ev_enable_state && data->motion_trigger_on) {
+ data->motion_trigger_on = false;
+ mutex_unlock(&data->mutex);
+ return 0;
+ }
+
+ /*
+ * Refer to comment in bmc150_accel_write_event_config for
+ * enable/disable operation order
+ */
+ ret = bmc150_accel_set_power_state(data, state);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ if (data->motion_trig == trig)
+ ret = bmc150_accel_setup_any_motion_interrupt(data, state);
+ else
+ ret = bmc150_accel_setup_new_data_interrupt(data, state);
+ if (ret < 0) {
+ mutex_unlock(&data->mutex);
+ return ret;
+ }
+ if (data->motion_trig == trig)
+ data->motion_trigger_on = state;
+ else
+ data->dready_trigger_on = state;
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_trigger_ops bmc150_accel_trigger_ops = {
+ .set_trigger_state = bmc150_accel_data_rdy_trigger_set_state,
+ .try_reenable = bmc150_accel_trig_try_reen,
+ .owner = THIS_MODULE,
+};
+
+static irqreturn_t bmc150_accel_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+ int dir;
+
+ ret = i2c_smbus_read_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_STATUS_2);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading reg_int_status_2\n");
+ goto ack_intr_status;
+ }
+
+ if (ret & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
+ dir = IIO_EV_DIR_FALLING;
+ else
+ dir = IIO_EV_DIR_RISING;
+
+ if (ret & BMC150_ACCEL_ANY_MOTION_MASK)
+ iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL,
+ 0,
+ IIO_MOD_X_OR_Y_OR_Z,
+ IIO_EV_TYPE_ROC,
+ IIO_EV_DIR_EITHER),
+ data->timestamp);
+ack_intr_status:
+ if (!data->dready_trigger_on)
+ ret = i2c_smbus_write_byte_data(data->client,
+ BMC150_ACCEL_REG_INT_RST_LATCH,
+ BMC150_ACCEL_INT_MODE_LATCH_INT |
+ BMC150_ACCEL_INT_MODE_LATCH_RESET);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t bmc150_accel_data_rdy_trig_poll(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ data->timestamp = iio_get_time_ns();
+
+ if (data->dready_trigger_on)
+ iio_trigger_poll(data->dready_trig);
+ else if (data->motion_trigger_on)
+ iio_trigger_poll(data->motion_trig);
+
+ if (data->ev_enable_state)
+ return IRQ_WAKE_THREAD;
+ else
+ return IRQ_HANDLED;
+}
+
+static int bmc150_accel_acpi_gpio_probe(struct i2c_client *client,
+ struct bmc150_accel_data *data)
+{
+ const struct acpi_device_id *id;
+ struct device *dev;
+ struct gpio_desc *gpio;
+ int ret;
+
+ if (!client)
+ return -EINVAL;
+
+ dev = &client->dev;
+ if (!ACPI_HANDLE(dev))
+ return -ENODEV;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!id)
+ return -ENODEV;
+
+ /* data ready gpio interrupt pin */
+ gpio = devm_gpiod_get_index(dev, BMC150_ACCEL_GPIO_NAME, 0);
+ if (IS_ERR(gpio)) {
+ dev_err(dev, "Failed: acpi gpio get index\n");
+ return PTR_ERR(gpio);
+ }
+
+ ret = gpiod_direction_input(gpio);
+ if (ret)
+ return ret;
+
+ ret = gpiod_to_irq(gpio);
+
+ dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
+
+ return ret;
+}
+
+static int bmc150_accel_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bmc150_accel_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ 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;
+
+ ret = bmc150_accel_chip_init(data);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&data->mutex);
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = bmc150_accel_channels;
+ indio_dev->num_channels = ARRAY_SIZE(bmc150_accel_channels);
+ indio_dev->name = BMC150_ACCEL_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &bmc150_accel_info;
+
+ if (client->irq < 0)
+ client->irq = bmc150_accel_acpi_gpio_probe(client, data);
+
+ if (client->irq >= 0) {
+ ret = devm_request_threaded_irq(
+ &client->dev, client->irq,
+ bmc150_accel_data_rdy_trig_poll,
+ bmc150_accel_event_handler,
+ IRQF_TRIGGER_RISING,
+ BMC150_ACCEL_IRQ_NAME,
+ indio_dev);
+ if (ret)
+ return ret;
+
+ data->dready_trig = devm_iio_trigger_alloc(&client->dev,
+ "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!data->dready_trig)
+ return -ENOMEM;
+
+ data->motion_trig = devm_iio_trigger_alloc(&client->dev,
+ "%s-any-motion-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!data->motion_trig)
+ return -ENOMEM;
+
+ data->dready_trig->dev.parent = &client->dev;
+ data->dready_trig->ops = &bmc150_accel_trigger_ops;
+ iio_trigger_set_drvdata(data->dready_trig, indio_dev);
+ ret = iio_trigger_register(data->dready_trig);
+ if (ret)
+ return ret;
+
+ data->motion_trig->dev.parent = &client->dev;
+ data->motion_trig->ops = &bmc150_accel_trigger_ops;
+ iio_trigger_set_drvdata(data->motion_trig, indio_dev);
+ ret = iio_trigger_register(data->motion_trig);
+ if (ret) {
+ data->motion_trig = NULL;
+ goto err_trigger_unregister;
+ }
+
+ ret = iio_triggered_buffer_setup(indio_dev,
+ &iio_pollfunc_store_time,
+ bmc150_accel_trigger_handler,
+ NULL);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed: iio triggered buffer setup\n");
+ goto err_trigger_unregister;
+ }
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ dev_err(&client->dev, "Unable to register iio device\n");
+ goto err_buffer_cleanup;
+ }
+
+ ret = pm_runtime_set_active(&client->dev);
+ if (ret)
+ goto err_iio_unregister;
+
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev,
+ BMC150_AUTO_SUSPEND_DELAY_MS);
+ pm_runtime_use_autosuspend(&client->dev);
+
+ return 0;
+
+err_iio_unregister:
+ iio_device_unregister(indio_dev);
+err_buffer_cleanup:
+ if (data->dready_trig)
+ iio_triggered_buffer_cleanup(indio_dev);
+err_trigger_unregister:
+ if (data->dready_trig)
+ iio_trigger_unregister(data->dready_trig);
+ if (data->motion_trig)
+ iio_trigger_unregister(data->motion_trig);
+
+ return ret;
+}
+
+static int bmc150_accel_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+
+ iio_device_unregister(indio_dev);
+
+ if (data->dready_trig) {
+ iio_triggered_buffer_cleanup(indio_dev);
+ iio_trigger_unregister(data->dready_trig);
+ iio_trigger_unregister(data->motion_trig);
+ }
+
+ mutex_lock(&data->mutex);
+ bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 0);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int bmc150_accel_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ mutex_lock(&data->mutex);
+ bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+static int bmc150_accel_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ mutex_lock(&data->mutex);
+ if (data->dready_trigger_on || data->motion_trigger_on ||
+ data->ev_enable_state)
+ bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int bmc150_accel_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+
+ dev_dbg(&data->client->dev, __func__);
+
+ return bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
+}
+
+static int bmc150_accel_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct bmc150_accel_data *data = iio_priv(indio_dev);
+ int ret;
+ int sleep_val;
+
+ dev_dbg(&data->client->dev, __func__);
+
+ ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
+ if (ret < 0)
+ return ret;
+
+ sleep_val = bmc150_accel_get_startup_times(data);
+ if (sleep_val < 20)
+ usleep_range(sleep_val * 1000, 20000);
+ else
+ msleep_interruptible(sleep_val);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops bmc150_accel_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(bmc150_accel_suspend, bmc150_accel_resume)
+ SET_RUNTIME_PM_OPS(bmc150_accel_runtime_suspend,
+ bmc150_accel_runtime_resume, NULL)
+};
+
+static const struct acpi_device_id bmc150_accel_acpi_match[] = {
+ {"BSBA0150", 0},
+ {"BMC150A", 0},
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
+
+static const struct i2c_device_id bmc150_accel_id[] = {
+ {"bmc150_accel", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, bmc150_accel_id);
+
+static struct i2c_driver bmc150_accel_driver = {
+ .driver = {
+ .name = BMC150_ACCEL_DRV_NAME,
+ .acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
+ .pm = &bmc150_accel_pm_ops,
+ },
+ .probe = bmc150_accel_probe,
+ .remove = bmc150_accel_remove,
+ .id_table = bmc150_accel_id,
+};
+module_i2c_driver(bmc150_accel_driver);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("BMC150 accelerometer driver");
projects / linux.git / commitdiff