diff options
Diffstat (limited to 'drivers/iio/imu/inv_mpu6050')
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 124 | ||||
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 6 | ||||
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c | 39 |
4 files changed, 142 insertions, 28 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/Kconfig b/drivers/iio/imu/inv_mpu6050/Kconfig index 2d0608ba88d7..48fbc0bc7e2a 100644 --- a/drivers/iio/imu/inv_mpu6050/Kconfig +++ b/drivers/iio/imu/inv_mpu6050/Kconfig @@ -7,6 +7,7 @@ config INV_MPU6050_IIO depends on I2C && SYSFS select IIO_BUFFER select IIO_TRIGGERED_BUFFER + select I2C_MUX help This driver supports the Invensense MPU6050 devices. This driver can also support MPU6500 in MPU6050 compatibility mode diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index b75519deac1a..f73e60b7a796 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -23,6 +23,8 @@ #include <linux/kfifo.h> #include <linux/spinlock.h> #include <linux/iio/iio.h> +#include <linux/i2c-mux.h> +#include <linux/acpi.h> #include "inv_mpu_iio.h" /* @@ -52,6 +54,7 @@ static const struct inv_mpu6050_reg_map reg_set_6050 = { .int_enable = INV_MPU6050_REG_INT_ENABLE, .pwr_mgmt_1 = INV_MPU6050_REG_PWR_MGMT_1, .pwr_mgmt_2 = INV_MPU6050_REG_PWR_MGMT_2, + .int_pin_cfg = INV_MPU6050_REG_INT_PIN_CFG, }; static const struct inv_mpu6050_chip_config chip_config_6050 = { @@ -77,6 +80,83 @@ int inv_mpu6050_write_reg(struct inv_mpu6050_state *st, int reg, u8 d) return i2c_smbus_write_i2c_block_data(st->client, reg, 1, &d); } +/* + * The i2c read/write needs to happen in unlocked mode. As the parent + * adapter is common. If we use locked versions, it will fail as + * the mux adapter will lock the parent i2c adapter, while calling + * select/deselect functions. + */ +static int inv_mpu6050_write_reg_unlocked(struct inv_mpu6050_state *st, + u8 reg, u8 d) +{ + int ret; + u8 buf[2]; + struct i2c_msg msg[1] = { + { + .addr = st->client->addr, + .flags = 0, + .len = sizeof(buf), + .buf = buf, + } + }; + + buf[0] = reg; + buf[1] = d; + ret = __i2c_transfer(st->client->adapter, msg, 1); + if (ret != 1) + return ret; + + return 0; +} + +static int inv_mpu6050_select_bypass(struct i2c_adapter *adap, void *mux_priv, + u32 chan_id) +{ + struct iio_dev *indio_dev = mux_priv; + struct inv_mpu6050_state *st = iio_priv(indio_dev); + int ret = 0; + + /* Use the same mutex which was used everywhere to protect power-op */ + mutex_lock(&indio_dev->mlock); + if (!st->powerup_count) { + ret = inv_mpu6050_write_reg_unlocked(st, st->reg->pwr_mgmt_1, + 0); + if (ret) + goto write_error; + + msleep(INV_MPU6050_REG_UP_TIME); + } + if (!ret) { + st->powerup_count++; + ret = inv_mpu6050_write_reg_unlocked(st, st->reg->int_pin_cfg, + st->client->irq | + INV_MPU6050_BIT_BYPASS_EN); + } +write_error: + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static int inv_mpu6050_deselect_bypass(struct i2c_adapter *adap, + void *mux_priv, u32 chan_id) +{ + struct iio_dev *indio_dev = mux_priv; + struct inv_mpu6050_state *st = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + /* It doesn't really mattter, if any of the calls fails */ + inv_mpu6050_write_reg_unlocked(st, st->reg->int_pin_cfg, + st->client->irq); + st->powerup_count--; + if (!st->powerup_count) + inv_mpu6050_write_reg_unlocked(st, st->reg->pwr_mgmt_1, + INV_MPU6050_BIT_SLEEP); + mutex_unlock(&indio_dev->mlock); + + return 0; +} + int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en, u32 mask) { u8 d, mgmt_1; @@ -133,13 +213,22 @@ int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en, u32 mask) int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on) { - int result; + int result = 0; + + if (power_on) { + /* Already under indio-dev->mlock mutex */ + if (!st->powerup_count) + result = inv_mpu6050_write_reg(st, st->reg->pwr_mgmt_1, + 0); + if (!result) + st->powerup_count++; + } else { + st->powerup_count--; + if (!st->powerup_count) + result = inv_mpu6050_write_reg(st, st->reg->pwr_mgmt_1, + INV_MPU6050_BIT_SLEEP); + } - if (power_on) - result = inv_mpu6050_write_reg(st, st->reg->pwr_mgmt_1, 0); - else - result = inv_mpu6050_write_reg(st, st->reg->pwr_mgmt_1, - INV_MPU6050_BIT_SLEEP); if (result) return result; @@ -673,6 +762,7 @@ static int inv_mpu_probe(struct i2c_client *client, st = iio_priv(indio_dev); st->client = client; + st->powerup_count = 0; pdata = dev_get_platdata(&client->dev); if (pdata) st->plat_data = *pdata; @@ -720,8 +810,21 @@ static int inv_mpu_probe(struct i2c_client *client, goto out_remove_trigger; } + st->mux_adapter = i2c_add_mux_adapter(client->adapter, + &client->dev, + indio_dev, + 0, 0, 0, + inv_mpu6050_select_bypass, + inv_mpu6050_deselect_bypass); + if (!st->mux_adapter) { + result = -ENODEV; + goto out_unreg_device; + } + return 0; +out_unreg_device: + iio_device_unregister(indio_dev); out_remove_trigger: inv_mpu6050_remove_trigger(st); out_unreg_ring: @@ -734,6 +837,7 @@ static int inv_mpu_remove(struct i2c_client *client) struct iio_dev *indio_dev = i2c_get_clientdata(client); struct inv_mpu6050_state *st = iio_priv(indio_dev); + i2c_del_mux_adapter(st->mux_adapter); iio_device_unregister(indio_dev); inv_mpu6050_remove_trigger(st); iio_triggered_buffer_cleanup(indio_dev); @@ -772,6 +876,13 @@ static const struct i2c_device_id inv_mpu_id[] = { MODULE_DEVICE_TABLE(i2c, inv_mpu_id); +static const struct acpi_device_id inv_acpi_match[] = { + {"INVN6500", 0}, + { }, +}; + +MODULE_DEVICE_TABLE(acpi, inv_acpi_match); + static struct i2c_driver inv_mpu_driver = { .probe = inv_mpu_probe, .remove = inv_mpu_remove, @@ -780,6 +891,7 @@ static struct i2c_driver inv_mpu_driver = { .owner = THIS_MODULE, .name = "inv-mpu6050", .pm = INV_MPU6050_PMOPS, + .acpi_match_table = ACPI_PTR(inv_acpi_match), }, }; diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index e7799315d4dc..aa837de57079 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h @@ -54,6 +54,7 @@ struct inv_mpu6050_reg_map { u8 int_enable; u8 pwr_mgmt_1; u8 pwr_mgmt_2; + u8 int_pin_cfg; }; /*device enum */ @@ -119,6 +120,8 @@ struct inv_mpu6050_state { enum inv_devices chip_type; spinlock_t time_stamp_lock; struct i2c_client *client; + struct i2c_adapter *mux_adapter; + unsigned int powerup_count; struct inv_mpu6050_platform_data plat_data; DECLARE_KFIFO(timestamps, long long, TIMESTAMP_FIFO_SIZE); }; @@ -179,6 +182,9 @@ struct inv_mpu6050_state { /* 6 + 6 round up and plus 8 */ #define INV_MPU6050_OUTPUT_DATA_SIZE 24 +#define INV_MPU6050_REG_INT_PIN_CFG 0x37 +#define INV_MPU6050_BIT_BYPASS_EN 0x2 + /* init parameters */ #define INV_MPU6050_INIT_FIFO_RATE 50 #define INV_MPU6050_TIME_STAMP_TOR 5 diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c index 926fccea8de0..844610c3a3a9 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c @@ -116,40 +116,35 @@ int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev) int ret; struct inv_mpu6050_state *st = iio_priv(indio_dev); - st->trig = iio_trigger_alloc("%s-dev%d", - indio_dev->name, - indio_dev->id); - if (st->trig == NULL) { - ret = -ENOMEM; - goto error_ret; - } - ret = request_irq(st->client->irq, &iio_trigger_generic_data_rdy_poll, - IRQF_TRIGGER_RISING, - "inv_mpu", - st->trig); + st->trig = devm_iio_trigger_alloc(&indio_dev->dev, + "%s-dev%d", + indio_dev->name, + indio_dev->id); + if (!st->trig) + return -ENOMEM; + + ret = devm_request_irq(&indio_dev->dev, st->client->irq, + &iio_trigger_generic_data_rdy_poll, + IRQF_TRIGGER_RISING, + "inv_mpu", + st->trig); if (ret) - goto error_free_trig; + return ret; + st->trig->dev.parent = &st->client->dev; st->trig->ops = &inv_mpu_trigger_ops; iio_trigger_set_drvdata(st->trig, indio_dev); + ret = iio_trigger_register(st->trig); if (ret) - goto error_free_irq; + return ret; + indio_dev->trig = iio_trigger_get(st->trig); return 0; - -error_free_irq: - free_irq(st->client->irq, st->trig); -error_free_trig: - iio_trigger_free(st->trig); -error_ret: - return ret; } void inv_mpu6050_remove_trigger(struct inv_mpu6050_state *st) { iio_trigger_unregister(st->trig); - free_irq(st->client->irq, st->trig); - iio_trigger_free(st->trig); } |