diff options
Diffstat (limited to 'drivers/iio/light/us5182d.c')
| -rw-r--r-- | drivers/iio/light/us5182d.c | 609 |
1 files changed, 546 insertions, 63 deletions
diff --git a/drivers/iio/light/us5182d.c b/drivers/iio/light/us5182d.c index 49dab3cb3e23..45bc2f742f46 100644 --- a/drivers/iio/light/us5182d.c +++ b/drivers/iio/light/us5182d.c @@ -20,14 +20,21 @@ #include <linux/acpi.h> #include <linux/delay.h> #include <linux/i2c.h> +#include <linux/iio/events.h> #include <linux/iio/iio.h> +#include <linux/interrupt.h> +#include <linux/irq.h> #include <linux/iio/sysfs.h> #include <linux/mutex.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> #define US5182D_REG_CFG0 0x00 #define US5182D_CFG0_ONESHOT_EN BIT(6) #define US5182D_CFG0_SHUTDOWN_EN BIT(7) #define US5182D_CFG0_WORD_ENABLE BIT(0) +#define US5182D_CFG0_PROX BIT(3) +#define US5182D_CFG0_PX_IRQ BIT(2) #define US5182D_REG_CFG1 0x01 #define US5182D_CFG1_ALS_RES16 BIT(4) @@ -39,6 +46,7 @@ #define US5182D_REG_CFG3 0x03 #define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5)) +#define US5182D_CFG3_INT_SOURCE_PX BIT(3) #define US5182D_REG_CFG4 0x10 @@ -53,6 +61,13 @@ #define US5182D_REG_AUTO_LDARK_GAIN 0x29 #define US5182D_REG_AUTO_HDARK_GAIN 0x2a +/* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */ +#define US5182D_REG_PXL_TH 0x08 +#define US5182D_REG_PXH_TH 0x0a + +#define US5182D_REG_PXL_TH_DEFAULT 1000 +#define US5182D_REG_PXH_TH_DEFAULT 30000 + #define US5182D_OPMODE_ALS 0x01 #define US5182D_OPMODE_PX 0x02 #define US5182D_OPMODE_SHIFT 4 @@ -81,6 +96,9 @@ #define US5182D_READ_BYTE 1 #define US5182D_READ_WORD 2 #define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */ +#define US5182D_SLEEP_MS 3000 /* ms */ +#define US5182D_PXH_TH_DISABLE 0xffff +#define US5182D_PXL_TH_DISABLE 0x0000 /* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */ static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600, @@ -99,6 +117,11 @@ enum mode { US5182D_PX_ONLY }; +enum pmode { + US5182D_CONTINUOUS, + US5182D_ONESHOT +}; + struct us5182d_data { struct i2c_client *client; struct mutex lock; @@ -111,7 +134,19 @@ struct us5182d_data { u8 upper_dark_gain; u16 *us5182d_dark_ths; + u16 px_low_th; + u16 px_high_th; + + int rising_en; + int falling_en; + u8 opmode; + u8 power_mode; + + bool als_enabled; + bool px_enabled; + + bool default_continuous; }; static IIO_CONST_ATTR(in_illuminance_scale_available, @@ -130,16 +165,30 @@ static const struct { u8 reg; u8 val; } us5182d_regvals[] = { - {US5182D_REG_CFG0, (US5182D_CFG0_SHUTDOWN_EN | - US5182D_CFG0_WORD_ENABLE)}, + {US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE}, {US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16}, {US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 | US5182D_CFG2_PXGAIN_DEFAULT)}, - {US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100}, - {US5182D_REG_MODE_STORE, US5182D_STORE_MODE}, + {US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 | + US5182D_CFG3_INT_SOURCE_PX}, {US5182D_REG_CFG4, 0x00}, }; +static const struct iio_event_spec us5182d_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + static const struct iio_chan_spec us5182d_channels[] = { { .type = IIO_LIGHT, @@ -149,40 +198,39 @@ static const struct iio_chan_spec us5182d_channels[] = { { .type = IIO_PROXIMITY, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .event_spec = us5182d_events, + .num_event_specs = ARRAY_SIZE(us5182d_events), } }; -static int us5182d_get_als(struct us5182d_data *data) +static int us5182d_oneshot_en(struct us5182d_data *data) { int ret; - unsigned long result; - ret = i2c_smbus_read_word_data(data->client, - US5182D_REG_ADL); + ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); if (ret < 0) return ret; - result = ret * data->ga / US5182D_GA_RESOLUTION; - if (result > 0xffff) - result = 0xffff; + /* + * In oneshot mode the chip will power itself down after taking the + * required measurement. + */ + ret = ret | US5182D_CFG0_ONESHOT_EN; - return result; + return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret); } static int us5182d_set_opmode(struct us5182d_data *data, u8 mode) { int ret; + if (mode == data->opmode) + return 0; + ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); if (ret < 0) return ret; - /* - * In oneshot mode the chip will power itself down after taking the - * required measurement. - */ - ret = ret | US5182D_CFG0_ONESHOT_EN; - /* update mode */ ret = ret & ~US5182D_OPMODE_MASK; ret = ret | (mode << US5182D_OPMODE_SHIFT); @@ -196,9 +244,6 @@ static int us5182d_set_opmode(struct us5182d_data *data, u8 mode) if (ret < 0) return ret; - if (mode == data->opmode) - return 0; - ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE, US5182D_STORE_MODE); if (ret < 0) @@ -210,6 +255,177 @@ static int us5182d_set_opmode(struct us5182d_data *data, u8 mode) return 0; } +static int us5182d_als_enable(struct us5182d_data *data) +{ + int ret; + u8 mode; + + if (data->power_mode == US5182D_ONESHOT) { + ret = us5182d_set_opmode(data, US5182D_ALS_ONLY); + if (ret < 0) + return ret; + data->px_enabled = false; + } + + if (data->als_enabled) + return 0; + + mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY; + + ret = us5182d_set_opmode(data, mode); + if (ret < 0) + return ret; + + data->als_enabled = true; + + return 0; +} + +static int us5182d_px_enable(struct us5182d_data *data) +{ + int ret; + u8 mode; + + if (data->power_mode == US5182D_ONESHOT) { + ret = us5182d_set_opmode(data, US5182D_PX_ONLY); + if (ret < 0) + return ret; + data->als_enabled = false; + } + + if (data->px_enabled) + return 0; + + mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY; + + ret = us5182d_set_opmode(data, mode); + if (ret < 0) + return ret; + + data->px_enabled = true; + + return 0; +} + +static int us5182d_get_als(struct us5182d_data *data) +{ + int ret; + unsigned long result; + + ret = us5182d_als_enable(data); + if (ret < 0) + return ret; + + ret = i2c_smbus_read_word_data(data->client, + US5182D_REG_ADL); + if (ret < 0) + return ret; + + result = ret * data->ga / US5182D_GA_RESOLUTION; + if (result > 0xffff) + result = 0xffff; + + return result; +} + +static int us5182d_get_px(struct us5182d_data *data) +{ + int ret; + + ret = us5182d_px_enable(data); + if (ret < 0) + return ret; + + return i2c_smbus_read_word_data(data->client, + US5182D_REG_PDL); +} + +static int us5182d_shutdown_en(struct us5182d_data *data, u8 state) +{ + int ret; + + if (data->power_mode == US5182D_ONESHOT) + return 0; + + ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); + if (ret < 0) + return ret; + + ret = ret & ~US5182D_CFG0_SHUTDOWN_EN; + ret = ret | state; + + ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret); + if (ret < 0) + return ret; + + if (state & US5182D_CFG0_SHUTDOWN_EN) { + data->als_enabled = false; + data->px_enabled = false; + } + + return ret; +} + + +static int us5182d_set_power_state(struct us5182d_data *data, bool on) +{ + int ret; + + if (data->power_mode == US5182D_ONESHOT) + return 0; + + if (on) { + ret = pm_runtime_get_sync(&data->client->dev); + if (ret < 0) + pm_runtime_put_noidle(&data->client->dev); + } else { + pm_runtime_mark_last_busy(&data->client->dev); + ret = pm_runtime_put_autosuspend(&data->client->dev); + } + + return ret; +} + +static int us5182d_read_value(struct us5182d_data *data, + struct iio_chan_spec const *chan) +{ + int ret, value; + + mutex_lock(&data->lock); + + if (data->power_mode == US5182D_ONESHOT) { + ret = us5182d_oneshot_en(data); + if (ret < 0) + goto out_err; + } + + ret = us5182d_set_power_state(data, true); + if (ret < 0) + goto out_err; + + if (chan->type == IIO_LIGHT) + ret = us5182d_get_als(data); + else + ret = us5182d_get_px(data); + if (ret < 0) + goto out_poweroff; + + value = ret; + + ret = us5182d_set_power_state(data, false); + if (ret < 0) + goto out_err; + + mutex_unlock(&data->lock); + return value; + +out_poweroff: + us5182d_set_power_state(data, false); +out_err: + mutex_unlock(&data->lock); + return ret; +} + static int us5182d_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -219,53 +435,21 @@ static int us5182d_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - switch (chan->type) { - case IIO_LIGHT: - mutex_lock(&data->lock); - ret = us5182d_set_opmode(data, US5182D_OPMODE_ALS); - if (ret < 0) - goto out_err; - - ret = us5182d_get_als(data); - if (ret < 0) - goto out_err; - mutex_unlock(&data->lock); - *val = ret; - return IIO_VAL_INT; - case IIO_PROXIMITY: - mutex_lock(&data->lock); - ret = us5182d_set_opmode(data, US5182D_OPMODE_PX); - if (ret < 0) - goto out_err; - - ret = i2c_smbus_read_word_data(data->client, - US5182D_REG_PDL); - if (ret < 0) - goto out_err; - mutex_unlock(&data->lock); - *val = ret; - return IIO_VAL_INT; - default: - return -EINVAL; - } - + ret = us5182d_read_value(data, chan); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1); if (ret < 0) return ret; - *val = 0; *val2 = us5182d_scales[ret & US5182D_AGAIN_MASK]; - return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } - - return -EINVAL; -out_err: - mutex_unlock(&data->lock); - return ret; } /** @@ -343,11 +527,201 @@ static int us5182d_write_raw(struct iio_dev *indio_dev, return -EINVAL; } +static int us5182d_setup_prox(struct iio_dev *indio_dev, + enum iio_event_direction dir, u16 val) +{ + struct us5182d_data *data = iio_priv(indio_dev); + + if (dir == IIO_EV_DIR_FALLING) + return i2c_smbus_write_word_data(data->client, + US5182D_REG_PXL_TH, val); + else if (dir == IIO_EV_DIR_RISING) + return i2c_smbus_write_word_data(data->client, + US5182D_REG_PXH_TH, val); + + return 0; +} + +static int us5182d_read_thresh(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 us5182d_data *data = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + mutex_lock(&data->lock); + *val = data->px_high_th; + mutex_unlock(&data->lock); + break; + case IIO_EV_DIR_FALLING: + mutex_lock(&data->lock); + *val = data->px_low_th; + mutex_unlock(&data->lock); + break; + default: + return -EINVAL; + } + + return IIO_VAL_INT; +} + +static int us5182d_write_thresh(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 us5182d_data *data = iio_priv(indio_dev); + int ret; + + if (val < 0 || val > USHRT_MAX || val2 != 0) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + mutex_lock(&data->lock); + if (data->rising_en) { + ret = us5182d_setup_prox(indio_dev, dir, val); + if (ret < 0) + goto err; + } + data->px_high_th = val; + mutex_unlock(&data->lock); + break; + case IIO_EV_DIR_FALLING: + mutex_lock(&data->lock); + if (data->falling_en) { + ret = us5182d_setup_prox(indio_dev, dir, val); + if (ret < 0) + goto err; + } + data->px_low_th = val; + mutex_unlock(&data->lock); + break; + default: + return -EINVAL; + } + + return 0; +err: + mutex_unlock(&data->lock); + return ret; +} + +static int us5182d_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 us5182d_data *data = iio_priv(indio_dev); + int ret; + + switch (dir) { + case IIO_EV_DIR_RISING: + mutex_lock(&data->lock); + ret = data->rising_en; + mutex_unlock(&data->lock); + break; + case IIO_EV_DIR_FALLING: + mutex_lock(&data->lock); + ret = data->falling_en; + mutex_unlock(&data->lock); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static int us5182d_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 us5182d_data *data = iio_priv(indio_dev); + int ret; + u16 new_th; + + mutex_lock(&data->lock); + + switch (dir) { + case IIO_EV_DIR_RISING: + if (data->rising_en == state) { + mutex_unlock(&data->lock); + return 0; + } + new_th = US5182D_PXH_TH_DISABLE; + if (state) { + data->power_mode = US5182D_CONTINUOUS; + ret = us5182d_set_power_state(data, true); + if (ret < 0) + goto err; + ret = us5182d_px_enable(data); + if (ret < 0) + goto err_poweroff; + new_th = data->px_high_th; + } + ret = us5182d_setup_prox(indio_dev, dir, new_th); + if (ret < 0) + goto err_poweroff; + data->rising_en = state; + break; + case IIO_EV_DIR_FALLING: + if (data->falling_en == state) { + mutex_unlock(&data->lock); + return 0; + } + new_th = US5182D_PXL_TH_DISABLE; + if (state) { + data->power_mode = US5182D_CONTINUOUS; + ret = us5182d_set_power_state(data, true); + if (ret < 0) + goto err; + ret = us5182d_px_enable(data); + if (ret < 0) + goto err_poweroff; + new_th = data->px_low_th; + } + ret = us5182d_setup_prox(indio_dev, dir, new_th); + if (ret < 0) + goto err_poweroff; + data->falling_en = state; + break; + default: + ret = -EINVAL; + goto err; + } + + if (!state) { + ret = us5182d_set_power_state(data, false); + if (ret < 0) + goto err; + } + + if (!data->falling_en && !data->rising_en && !data->default_continuous) + data->power_mode = US5182D_ONESHOT; + + mutex_unlock(&data->lock); + return 0; + +err_poweroff: + if (state) + us5182d_set_power_state(data, false); +err: + mutex_unlock(&data->lock); + return ret; +} + static const struct iio_info us5182d_info = { .driver_module = THIS_MODULE, .read_raw = us5182d_read_raw, .write_raw = us5182d_write_raw, .attrs = &us5182d_attr_group, + .read_event_value = &us5182d_read_thresh, + .write_event_value = &us5182d_write_thresh, + .read_event_config = &us5182d_read_event_config, + .write_event_config = &us5182d_write_event_config, }; static int us5182d_reset(struct iio_dev *indio_dev) @@ -368,6 +742,10 @@ static int us5182d_init(struct iio_dev *indio_dev) return ret; data->opmode = 0; + data->power_mode = US5182D_CONTINUOUS; + data->px_low_th = US5182D_REG_PXL_TH_DEFAULT; + data->px_high_th = US5182D_REG_PXH_TH_DEFAULT; + for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) { ret = i2c_smbus_write_byte_data(data->client, us5182d_regvals[i].reg, @@ -376,7 +754,17 @@ static int us5182d_init(struct iio_dev *indio_dev) return ret; } - return 0; + data->als_enabled = true; + data->px_enabled = true; + + if (!data->default_continuous) { + ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); + if (ret < 0) + return ret; + data->power_mode = US5182D_ONESHOT; + } + + return ret; } static void us5182d_get_platform_data(struct iio_dev *indio_dev) @@ -399,6 +787,8 @@ static void us5182d_get_platform_data(struct iio_dev *indio_dev) "upisemi,lower-dark-gain", &data->lower_dark_gain)) data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT; + data->default_continuous = device_property_read_bool(&data->client->dev, + "upisemi,continuous"); } static int us5182d_dark_gain_config(struct iio_dev *indio_dev) @@ -426,6 +816,33 @@ static int us5182d_dark_gain_config(struct iio_dev *indio_dev) US5182D_REG_DARK_AUTO_EN_DEFAULT); } +static irqreturn_t us5182d_irq_thread_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct us5182d_data *data = iio_priv(indio_dev); + enum iio_event_direction dir; + int ret; + u64 ev; + + ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); + if (ret < 0) { + dev_err(&data->client->dev, "i2c transfer error in irq\n"); + return IRQ_HANDLED; + } + + dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING; + ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir); + + iio_push_event(indio_dev, ev, iio_get_time_ns()); + + ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, + ret & ~US5182D_CFG0_PX_IRQ); + if (ret < 0) + dev_err(&data->client->dev, "i2c transfer error in irq\n"); + + return IRQ_HANDLED; +} + static int us5182d_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -457,6 +874,16 @@ static int us5182d_probe(struct i2c_client *client, return (ret < 0) ? ret : -ENODEV; } + if (client->irq > 0) { + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, + us5182d_irq_thread_handler, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "us5182d-irq", indio_dev); + if (ret < 0) + return ret; + } else + dev_warn(&client->dev, "no valid irq found\n"); + us5182d_get_platform_data(indio_dev); ret = us5182d_init(indio_dev); if (ret < 0) @@ -464,18 +891,73 @@ static int us5182d_probe(struct i2c_client *client, ret = us5182d_dark_gain_config(indio_dev); if (ret < 0) - return ret; + goto out_err; + + if (data->default_continuous) { + pm_runtime_set_active(&client->dev); + if (ret < 0) + goto out_err; + } + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, + US5182D_SLEEP_MS); + pm_runtime_use_autosuspend(&client->dev); + + ret = iio_device_register(indio_dev); + if (ret < 0) + goto out_err; + + return 0; + +out_err: + us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); + return ret; - return iio_device_register(indio_dev); } static int us5182d_remove(struct i2c_client *client) { + struct us5182d_data *data = iio_priv(i2c_get_clientdata(client)); + iio_device_unregister(i2c_get_clientdata(client)); - return i2c_smbus_write_byte_data(client, US5182D_REG_CFG0, - US5182D_CFG0_SHUTDOWN_EN); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + + return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); +} + +#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) +static int us5182d_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct us5182d_data *data = iio_priv(indio_dev); + + if (data->power_mode == US5182D_CONTINUOUS) + return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); + + return 0; } +static int us5182d_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct us5182d_data *data = iio_priv(indio_dev); + + if (data->power_mode == US5182D_CONTINUOUS) + return us5182d_shutdown_en(data, + ~US5182D_CFG0_SHUTDOWN_EN & 0xff); + + return 0; +} +#endif + +static const struct dev_pm_ops us5182d_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume) + SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL) +}; + static const struct acpi_device_id us5182d_acpi_match[] = { { "USD5182", 0}, {} @@ -493,6 +975,7 @@ MODULE_DEVICE_TABLE(i2c, us5182d_id); static struct i2c_driver us5182d_driver = { .driver = { .name = US5182D_DRV_NAME, + .pm = &us5182d_pm_ops, .acpi_match_table = ACPI_PTR(us5182d_acpi_match), }, .probe = us5182d_probe, |