diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/mxc4005.c | 142 |
1 files changed, 141 insertions, 1 deletions
diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c index 390eaf8cb2f8..e72e218c2696 100644 --- a/drivers/iio/accel/mxc4005.c +++ b/drivers/iio/accel/mxc4005.c @@ -17,13 +17,16 @@ #include <linux/i2c.h> #include <linux/iio/iio.h> #include <linux/acpi.h> +#include <linux/gpio/consumer.h> #include <linux/regmap.h> #include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> #include <linux/iio/buffer.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/trigger_consumer.h> #define MXC4005_DRV_NAME "mxc4005" +#define MXC4005_IRQ_NAME "mxc4005_event" #define MXC4005_REGMAP_NAME "mxc4005_regmap" #define MXC4005_REG_XOUT_UPPER 0x03 @@ -33,6 +36,12 @@ #define MXC4005_REG_ZOUT_UPPER 0x07 #define MXC4005_REG_ZOUT_LOWER 0x08 +#define MXC4005_REG_INT_MASK1 0x0B +#define MXC4005_REG_INT_MASK1_BIT_DRDYE 0x01 + +#define MXC4005_REG_INT_CLR1 0x01 +#define MXC4005_REG_INT_CLR1_BIT_DRDYC 0x01 + #define MXC4005_REG_CONTROL 0x0D #define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5) #define MXC4005_CONTROL_FSR_SHIFT 5 @@ -55,7 +64,9 @@ struct mxc4005_data { struct device *dev; struct mutex mutex; struct regmap *regmap; + struct iio_trigger *dready_trig; __be16 buffer[8]; + bool trigger_enabled; }; /* @@ -107,6 +118,8 @@ static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg) static bool mxc4005_is_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { + case MXC4005_REG_INT_CLR1: + case MXC4005_REG_INT_MASK1: case MXC4005_REG_CONTROL: return true; default: @@ -307,6 +320,91 @@ err: return IRQ_HANDLED; } +static int mxc4005_clr_intr(struct mxc4005_data *data) +{ + int ret; + + /* clear interrupt */ + ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1, + MXC4005_REG_INT_CLR1_BIT_DRDYC); + if (ret < 0) { + dev_err(data->dev, "failed to write to reg_int_clr1\n"); + return ret; + } + + return 0; +} + +static int mxc4005_set_trigger_state(struct iio_trigger *trig, + bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct mxc4005_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->mutex); + if (state) { + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1, + MXC4005_REG_INT_MASK1_BIT_DRDYE); + } else { + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1, + ~MXC4005_REG_INT_MASK1_BIT_DRDYE); + } + + if (ret < 0) { + mutex_unlock(&data->mutex); + dev_err(data->dev, "failed to update reg_int_mask1"); + return ret; + } + + data->trigger_enabled = state; + mutex_unlock(&data->mutex); + + return 0; +} + +static int mxc4005_trigger_try_reen(struct iio_trigger *trig) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct mxc4005_data *data = iio_priv(indio_dev); + + if (!data->dready_trig) + return 0; + + return mxc4005_clr_intr(data); +} + +static const struct iio_trigger_ops mxc4005_trigger_ops = { + .set_trigger_state = mxc4005_set_trigger_state, + .try_reenable = mxc4005_trigger_try_reen, + .owner = THIS_MODULE, +}; + +static int mxc4005_gpio_probe(struct i2c_client *client, + struct mxc4005_data *data) +{ + struct device *dev; + struct gpio_desc *gpio; + int ret; + + if (!client) + return -EINVAL; + + dev = &client->dev; + + gpio = devm_gpiod_get_index(dev, "mxc4005_int", 0, GPIOD_IN); + if (IS_ERR(gpio)) { + dev_err(dev, "failed to get acpi gpio index\n"); + return PTR_ERR(gpio); + } + + ret = gpiod_to_irq(gpio); + + dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret); + + return ret; +} + static int mxc4005_chip_init(struct mxc4005_data *data) { int ret; @@ -363,7 +461,7 @@ static int mxc4005_probe(struct i2c_client *client, indio_dev->info = &mxc4005_info; ret = iio_triggered_buffer_setup(indio_dev, - &iio_pollfunc_store_time, + iio_pollfunc_store_time, mxc4005_trigger_handler, NULL); if (ret < 0) { @@ -372,6 +470,43 @@ static int mxc4005_probe(struct i2c_client *client, return ret; } + if (client->irq < 0) + client->irq = mxc4005_gpio_probe(client, data); + + if (client->irq > 0) { + data->dready_trig = devm_iio_trigger_alloc(&client->dev, + "%s-dev%d", + indio_dev->name, + indio_dev->id); + if (!data->dready_trig) + return -ENOMEM; + + ret = devm_request_threaded_irq(&client->dev, client->irq, + iio_trigger_generic_data_rdy_poll, + NULL, + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + MXC4005_IRQ_NAME, + data->dready_trig); + if (ret) { + dev_err(&client->dev, + "failed to init threaded irq\n"); + goto err_buffer_cleanup; + } + + data->dready_trig->dev.parent = &client->dev; + data->dready_trig->ops = &mxc4005_trigger_ops; + iio_trigger_set_drvdata(data->dready_trig, indio_dev); + indio_dev->trig = data->dready_trig; + iio_trigger_get(indio_dev->trig); + ret = iio_trigger_register(data->dready_trig); + if (ret) { + dev_err(&client->dev, + "failed to register trigger\n"); + goto err_trigger_unregister; + } + } + ret = iio_device_register(indio_dev); if (ret < 0) { dev_err(&client->dev, @@ -381,6 +516,8 @@ static int mxc4005_probe(struct i2c_client *client, return 0; +err_trigger_unregister: + iio_trigger_unregister(data->dready_trig); err_buffer_cleanup: iio_triggered_buffer_cleanup(indio_dev); @@ -390,10 +527,13 @@ err_buffer_cleanup: static int mxc4005_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct mxc4005_data *data = iio_priv(indio_dev); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); + if (data->dready_trig) + iio_trigger_unregister(data->dready_trig); return 0; } |