/* * BMG160 Gyro Sensor 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define BMG160_DRV_NAME "bmg160" #define BMG160_IRQ_NAME "bmg160_event" #define BMG160_GPIO_NAME "gpio_int" #define BMG160_REG_CHIP_ID 0x00 #define BMG160_CHIP_ID_VAL 0x0F #define BMG160_REG_PMU_LPW 0x11 #define BMG160_MODE_NORMAL 0x00 #define BMG160_MODE_DEEP_SUSPEND 0x20 #define BMG160_MODE_SUSPEND 0x80 #define BMG160_REG_RANGE 0x0F #define BMG160_RANGE_2000DPS 0 #define BMG160_RANGE_1000DPS 1 #define BMG160_RANGE_500DPS 2 #define BMG160_RANGE_250DPS 3 #define BMG160_RANGE_125DPS 4 #define BMG160_REG_PMU_BW 0x10 #define BMG160_NO_FILTER 0 #define BMG160_DEF_BW 100 #define BMG160_REG_INT_MAP_0 0x17 #define BMG160_INT_MAP_0_BIT_ANY BIT(1) #define BMG160_REG_INT_MAP_1 0x18 #define BMG160_INT_MAP_1_BIT_NEW_DATA BIT(0) #define BMG160_REG_INT_RST_LATCH 0x21 #define BMG160_INT_MODE_LATCH_RESET 0x80 #define BMG160_INT_MODE_LATCH_INT 0x0F #define BMG160_INT_MODE_NON_LATCH_INT 0x00 #define BMG160_REG_INT_EN_0 0x15 #define BMG160_DATA_ENABLE_INT BIT(7) #define BMG160_REG_XOUT_L 0x02 #define BMG160_AXIS_TO_REG(axis) (BMG160_REG_XOUT_L + (axis * 2)) #define BMG160_REG_SLOPE_THRES 0x1B #define BMG160_SLOPE_THRES_MASK 0x0F #define BMG160_REG_MOTION_INTR 0x1C #define BMG160_INT_MOTION_X BIT(0) #define BMG160_INT_MOTION_Y BIT(1) #define BMG160_INT_MOTION_Z BIT(2) #define BMG160_ANY_DUR_MASK 0x30 #define BMG160_ANY_DUR_SHIFT 4 #define BMG160_REG_INT_STATUS_2 0x0B #define BMG160_ANY_MOTION_MASK 0x07 #define BMG160_REG_TEMP 0x08 #define BMG160_TEMP_CENTER_VAL 23 #define BMG160_MAX_STARTUP_TIME_MS 80 #define BMG160_AUTO_SUSPEND_DELAY_MS 2000 struct bmg160_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 dps_range; int ev_enable_state; int slope_thres; bool dready_trigger_on; bool motion_trigger_on; int64_t timestamp; }; enum bmg160_axis { AXIS_X, AXIS_Y, AXIS_Z, }; static const struct { int val; int bw_bits; } bmg160_samp_freq_table[] = { {100, 0x07}, {200, 0x06}, {400, 0x03}, {1000, 0x02}, {2000, 0x01} }; static const struct { int scale; int dps_range; } bmg160_scale_table[] = { { 1065, BMG160_RANGE_2000DPS}, { 532, BMG160_RANGE_1000DPS}, { 266, BMG160_RANGE_500DPS}, { 133, BMG160_RANGE_250DPS}, { 66, BMG160_RANGE_125DPS} }; static int bmg160_set_mode(struct bmg160_data *data, u8 mode) { int ret; ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_LPW, mode); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n"); return ret; } return 0; } static int bmg160_convert_freq_to_bit(int val) { int i; for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { if (bmg160_samp_freq_table[i].val == val) return bmg160_samp_freq_table[i].bw_bits; } return -EINVAL; } static int bmg160_set_bw(struct bmg160_data *data, int val) { int ret; int bw_bits; bw_bits = bmg160_convert_freq_to_bit(val); if (bw_bits < 0) return bw_bits; ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW, bw_bits); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_pmu_bw\n"); return ret; } data->bw_bits = bw_bits; return 0; } static int bmg160_chip_init(struct bmg160_data *data) { int ret; ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_chip_id\n"); return ret; } dev_dbg(&data->client->dev, "Chip Id %x\n", ret); if (ret != BMG160_CHIP_ID_VAL) { dev_err(&data->client->dev, "invalid chip %x\n", ret); return -ENODEV; } ret = bmg160_set_mode(data, BMG160_MODE_NORMAL); if (ret < 0) return ret; /* Wait upto 500 ms to be ready after changing mode */ usleep_range(500, 1000); /* Set Bandwidth */ ret = bmg160_set_bw(data, BMG160_DEF_BW); if (ret < 0) return ret; /* Set Default Range */ ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_RANGE, BMG160_RANGE_500DPS); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_range\n"); return ret; } data->dps_range = BMG160_RANGE_500DPS; ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_slope_thres\n"); return ret; } data->slope_thres = ret; /* Set default interrupt mode */ ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_motion_intr\n"); return ret; } return 0; } static int bmg160_set_power_state(struct bmg160_data *data, bool on) { #ifdef CONFIG_PM_RUNTIME 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: bmg160_set_power_state for %d\n", on); return ret; } #endif return 0; } static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data, bool status) { int ret; /* Enable/Disable INT_MAP0 mapping */ ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_0); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_int_map0\n"); return ret; } if (status) ret |= BMG160_INT_MAP_0_BIT_ANY; else ret &= ~BMG160_INT_MAP_0_BIT_ANY; ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_MAP_0, ret); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_int_map0\n"); return ret; } /* Enable/Disable slope interrupts */ if (status) { /* Update slope thres */ ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_SLOPE_THRES, data->slope_thres); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_slope_thres\n"); return ret; } ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_MOTION_INTR, BMG160_INT_MOTION_X | BMG160_INT_MOTION_Y | BMG160_INT_MOTION_Z); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_motion_intr\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, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); return ret; } } ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_EN_0, BMG160_DATA_ENABLE_INT); } else ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_EN_0, 0); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_int_en0\n"); return ret; } return 0; } static int bmg160_setup_new_data_interrupt(struct bmg160_data *data, bool status) { int ret; /* Enable/Disable INT_MAP1 mapping */ ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_int_map1\n"); return ret; } if (status) ret |= BMG160_INT_MAP_1_BIT_NEW_DATA; else ret &= ~BMG160_INT_MAP_1_BIT_NEW_DATA; ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_MAP_1, ret); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_int_map1\n"); return ret; } if (status) { ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_NON_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); return ret; } ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_EN_0, BMG160_DATA_ENABLE_INT); } else { /* Restore interrupt mode */ ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); return ret; } ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_EN_0, 0); } if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_int_en0\n"); return ret; } return 0; } static int bmg160_get_bw(struct bmg160_data *data, int *val) { int i; for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { if (bmg160_samp_freq_table[i].bw_bits == data->bw_bits) { *val = bmg160_samp_freq_table[i].val; return IIO_VAL_INT; } } return -EINVAL; } static int bmg160_set_scale(struct bmg160_data *data, int val) { int ret, i; for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) { if (bmg160_scale_table[i].scale == val) { ret = i2c_smbus_write_byte_data( data->client, BMG160_REG_RANGE, bmg160_scale_table[i].dps_range); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_range\n"); return ret; } data->dps_range = bmg160_scale_table[i].dps_range; return 0; } } return -EINVAL; } static int bmg160_get_temp(struct bmg160_data *data, int *val) { int ret; mutex_lock(&data->mutex); ret = bmg160_set_power_state(data, true); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_temp\n"); bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; } *val = sign_extend32(ret, 7); ret = bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); if (ret < 0) return ret; return IIO_VAL_INT; } static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val) { int ret; mutex_lock(&data->mutex); ret = bmg160_set_power_state(data, true); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } ret = i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis)); if (ret < 0) { dev_err(&data->client->dev, "Error reading axis %d\n", axis); bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; } *val = sign_extend32(ret, 15); ret = bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); if (ret < 0) return ret; return IIO_VAL_INT; } static int bmg160_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct bmg160_data *data = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: switch (chan->type) { case IIO_TEMP: return bmg160_get_temp(data, val); case IIO_ANGL_VEL: if (iio_buffer_enabled(indio_dev)) return -EBUSY; else return bmg160_get_axis(data, chan->scan_index, val); default: return -EINVAL; } case IIO_CHAN_INFO_OFFSET: if (chan->type == IIO_TEMP) { *val = BMG160_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_ANGL_VEL: { int i; for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) { if (bmg160_scale_table[i].dps_range == data->dps_range) { *val2 = bmg160_scale_table[i].scale; return IIO_VAL_INT_PLUS_MICRO; } } return -EINVAL; } default: return -EINVAL; } case IIO_CHAN_INFO_SAMP_FREQ: *val2 = 0; mutex_lock(&data->mutex); ret = bmg160_get_bw(data, val); mutex_unlock(&data->mutex); return ret; default: return -EINVAL; } } static int bmg160_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct bmg160_data *data = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: mutex_lock(&data->mutex); /* * Section 4.2 of spec * In suspend mode, the only supported operations are reading * registers as well as writing to the (0x14) softreset * register. Since we will be in suspend mode by default, change * mode to power on for other writes. */ ret = bmg160_set_power_state(data, true); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } ret = bmg160_set_bw(data, val); if (ret < 0) { bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; } ret = bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; case IIO_CHAN_INFO_SCALE: if (val) return -EINVAL; mutex_lock(&data->mutex); /* Refer to comments above for the suspend mode ops */ ret = bmg160_set_power_state(data, true); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } ret = bmg160_set_scale(data, val2); if (ret < 0) { bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; } ret = bmg160_set_power_state(data, false); mutex_unlock(&data->mutex); return ret; default: return -EINVAL; } return -EINVAL; } static int bmg160_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 bmg160_data *data = iio_priv(indio_dev); *val2 = 0; switch (info) { case IIO_EV_INFO_VALUE: *val = data->slope_thres & BMG160_SLOPE_THRES_MASK; break; default: return -EINVAL; } return IIO_VAL_INT; } static int bmg160_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 bmg160_data *data = iio_priv(indio_dev); switch (info) { case IIO_EV_INFO_VALUE: if (data->ev_enable_state) return -EBUSY; data->slope_thres &= ~BMG160_SLOPE_THRES_MASK; data->slope_thres |= (val & BMG160_SLOPE_THRES_MASK); break; default: return -EINVAL; } return 0; } static int bmg160_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 bmg160_data *data = iio_priv(indio_dev); return data->ev_enable_state; } static int bmg160_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 bmg160_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 = bmg160_set_power_state(data, state); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } ret = bmg160_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 bmg160_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) { struct bmg160_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("100 200 400 1000 2000"); static IIO_CONST_ATTR(in_anglvel_scale_available, "0.001065 0.000532 0.000266 0.000133 0.000066"); static struct attribute *bmg160_attributes[] = { &iio_const_attr_sampling_frequency_available.dev_attr.attr, &iio_const_attr_in_anglvel_scale_available.dev_attr.attr, NULL, }; static const struct attribute_group bmg160_attrs_group = { .attrs = bmg160_attributes, }; static const struct iio_event_spec bmg160_event = { .type = IIO_EV_TYPE_ROC, .dir = IIO_EV_DIR_RISING | IIO_EV_DIR_FALLING, .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE) }; #define BMG160_CHANNEL(_axis) { \ .type = IIO_ANGL_VEL, \ .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 = 16, \ .storagebits = 16, \ }, \ .event_spec = &bmg160_event, \ .num_event_specs = 1 \ } static const struct iio_chan_spec bmg160_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, }, BMG160_CHANNEL(X), BMG160_CHANNEL(Y), BMG160_CHANNEL(Z), IIO_CHAN_SOFT_TIMESTAMP(3), }; static const struct iio_info bmg160_info = { .attrs = &bmg160_attrs_group, .read_raw = bmg160_read_raw, .write_raw = bmg160_write_raw, .read_event_value = bmg160_read_event, .write_event_value = bmg160_write_event, .write_event_config = bmg160_write_event_config, .read_event_config = bmg160_read_event_config, .validate_trigger = bmg160_validate_trigger, .driver_module = THIS_MODULE, }; static irqreturn_t bmg160_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct bmg160_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, BMG160_AXIS_TO_REG(bit)); if (ret < 0) { mutex_unlock(&data->mutex); goto err; } data->buffer[i++] = ret; } mutex_unlock(&data->mutex); iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, data->timestamp); err: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } static int bmg160_trig_try_reen(struct iio_trigger *trig) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); struct bmg160_data *data = iio_priv(indio_dev); int ret; /* new data interrupts don't need ack */ if (data->dready_trigger_on) return 0; /* Set latched mode interrupt and clear any latched interrupt */ ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) { dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); return ret; } return 0; } static int bmg160_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); struct bmg160_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 bmg160_write_event_config for * enable/disable operation order */ ret = bmg160_set_power_state(data, state); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } if (data->motion_trig == trig) ret = bmg160_setup_any_motion_interrupt(data, state); else ret = bmg160_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 0; } static const struct iio_trigger_ops bmg160_trigger_ops = { .set_trigger_state = bmg160_data_rdy_trigger_set_state, .try_reenable = bmg160_trig_try_reen, .owner = THIS_MODULE, }; static irqreturn_t bmg160_event_handler(int irq, void *private) { struct iio_dev *indio_dev = private; struct bmg160_data *data = iio_priv(indio_dev); int ret; int dir; ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2); if (ret < 0) { dev_err(&data->client->dev, "Error reading reg_int_status2\n"); goto ack_intr_status; } if (ret & 0x08) dir = IIO_EV_DIR_RISING; else dir = IIO_EV_DIR_FALLING; if (ret & BMG160_ANY_MOTION_MASK) iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, 0, IIO_MOD_X_OR_Y_OR_Z, IIO_EV_TYPE_ROC, dir), data->timestamp); ack_intr_status: if (!data->dready_trigger_on) { ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_INT_RST_LATCH, BMG160_INT_MODE_LATCH_INT | BMG160_INT_MODE_LATCH_RESET); if (ret < 0) dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); } return IRQ_HANDLED; } static irqreturn_t bmg160_data_rdy_trig_poll(int irq, void *private) { struct iio_dev *indio_dev = private; struct bmg160_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 bmg160_acpi_gpio_probe(struct i2c_client *client, struct bmg160_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, BMG160_GPIO_NAME, 0); if (IS_ERR(gpio)) { dev_err(dev, "acpi gpio get index failed\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 bmg160_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct bmg160_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 = bmg160_chip_init(data); if (ret < 0) return ret; mutex_init(&data->mutex); indio_dev->dev.parent = &client->dev; indio_dev->channels = bmg160_channels; indio_dev->num_channels = ARRAY_SIZE(bmg160_channels); indio_dev->name = BMG160_DRV_NAME; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &bmg160_info; if (client->irq <= 0) client->irq = bmg160_acpi_gpio_probe(client, data); if (client->irq > 0) { ret = devm_request_threaded_irq(&client->dev, client->irq, bmg160_data_rdy_trig_poll, bmg160_event_handler, IRQF_TRIGGER_RISING, BMG160_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 = &bmg160_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 = &bmg160_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, NULL, bmg160_trigger_handler, NULL); if (ret < 0) { dev_err(&client->dev, "iio triggered buffer setup failed\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, BMG160_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 bmg160_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); struct bmg160_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); bmg160_set_mode(data, BMG160_MODE_DEEP_SUSPEND); mutex_unlock(&data->mutex); return 0; } #ifdef CONFIG_PM_SLEEP static int bmg160_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct bmg160_data *data = iio_priv(indio_dev); mutex_lock(&data->mutex); bmg160_set_mode(data, BMG160_MODE_SUSPEND); mutex_unlock(&data->mutex); return 0; } static int bmg160_resume(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct bmg160_data *data = iio_priv(indio_dev); mutex_lock(&data->mutex); if (data->dready_trigger_on || data->motion_trigger_on || data->ev_enable_state) bmg160_set_mode(data, BMG160_MODE_NORMAL); mutex_unlock(&data->mutex); return 0; } #endif #ifdef CONFIG_PM_RUNTIME static int bmg160_runtime_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct bmg160_data *data = iio_priv(indio_dev); return bmg160_set_mode(data, BMG160_MODE_SUSPEND); } static int bmg160_runtime_resume(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct bmg160_data *data = iio_priv(indio_dev); int ret; ret = bmg160_set_mode(data, BMG160_MODE_NORMAL); if (ret < 0) return ret; msleep_interruptible(BMG160_MAX_STARTUP_TIME_MS); return 0; } #endif static const struct dev_pm_ops bmg160_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(bmg160_suspend, bmg160_resume) SET_RUNTIME_PM_OPS(bmg160_runtime_suspend, bmg160_runtime_resume, NULL) }; static const struct acpi_device_id bmg160_acpi_match[] = { {"BMG0160", 0}, { }, }; MODULE_DEVICE_TABLE(acpi, bmg160_acpi_match); static const struct i2c_device_id bmg160_id[] = { {"bmg160", 0}, {} }; MODULE_DEVICE_TABLE(i2c, bmg160_id); static struct i2c_driver bmg160_driver = { .driver = { .name = BMG160_DRV_NAME, .acpi_match_table = ACPI_PTR(bmg160_acpi_match), .pm = &bmg160_pm_ops, }, .probe = bmg160_probe, .remove = bmg160_remove, .id_table = bmg160_id, }; module_i2c_driver(bmg160_driver); MODULE_AUTHOR("Srinivas Pandruvada "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("BMG160 Gyro driver");