diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/iio/light/pa12203001.c | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/drivers/iio/light/pa12203001.c b/drivers/iio/light/pa12203001.c new file mode 100644 index 000000000..30ea1a088 --- /dev/null +++ b/drivers/iio/light/pa12203001.c @@ -0,0 +1,488 @@ +/* + * Copyright (c) 2015 Intel Corporation + * + * Driver for TXC PA12203001 Proximity and Ambient Light Sensor. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * To do: Interrupt support. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/mutex.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#define PA12203001_DRIVER_NAME "pa12203001" + +#define PA12203001_REG_CFG0 0x00 +#define PA12203001_REG_CFG1 0x01 +#define PA12203001_REG_CFG2 0x02 +#define PA12203001_REG_CFG3 0x03 + +#define PA12203001_REG_ADL 0x0b +#define PA12203001_REG_PDH 0x0e + +#define PA12203001_REG_POFS 0x10 +#define PA12203001_REG_PSET 0x11 + +#define PA12203001_ALS_EN_MASK BIT(0) +#define PA12203001_PX_EN_MASK BIT(1) +#define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6) +#define PA12203001_AFSR_MASK GENMASK(5, 4) +#define PA12203001_AFSR_SHIFT 4 + +#define PA12203001_PSCAN 0x03 + +/* als range 31000, ps, als disabled */ +#define PA12203001_REG_CFG0_DEFAULT 0x30 + +/* led current: 100 mA */ +#define PA12203001_REG_CFG1_DEFAULT 0x20 + +/* ps mode: normal, interrupts not active */ +#define PA12203001_REG_CFG2_DEFAULT 0xcc + +#define PA12203001_REG_CFG3_DEFAULT 0x00 + +#define PA12203001_SLEEP_DELAY_MS 3000 + +#define PA12203001_CHIP_ENABLE 0xff +#define PA12203001_CHIP_DISABLE 0x00 + +/* available scales: corresponding to [500, 4000, 7000, 31000] lux */ +static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029}; + +struct pa12203001_data { + struct i2c_client *client; + + /* protect device states */ + struct mutex lock; + + bool als_enabled; + bool px_enabled; + bool als_needs_enable; + bool px_needs_enable; + + struct regmap *map; +}; + +static const struct { + u8 reg; + u8 val; +} regvals[] = { + {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT}, + {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT}, + {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT}, + {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT}, + {PA12203001_REG_PSET, PA12203001_PSCAN}, +}; + +static IIO_CONST_ATTR(in_illuminance_scale_available, + "0.007629 0.061036 0.106813 0.473029"); + +static struct attribute *pa12203001_attrs[] = { + &iio_const_attr_in_illuminance_scale_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group pa12203001_attr_group = { + .attrs = pa12203001_attrs, +}; + +static const struct iio_chan_spec pa12203001_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, + { + .type = IIO_PROXIMITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + } +}; + +static const struct regmap_range pa12203001_volatile_regs_ranges[] = { + regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1), + regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH), +}; + +static const struct regmap_access_table pa12203001_volatile_regs = { + .yes_ranges = pa12203001_volatile_regs_ranges, + .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges), +}; + +static const struct regmap_config pa12203001_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = PA12203001_REG_PSET, + .cache_type = REGCACHE_RBTREE, + .volatile_table = &pa12203001_volatile_regs, +}; + +static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable) +{ + int ret; + + ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, + PA12203001_ALS_EN_MASK, enable); + if (ret < 0) + return ret; + + data->als_enabled = !!enable; + + return 0; +} + +static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable) +{ + int ret; + + ret = regmap_update_bits(data->map, PA12203001_REG_CFG0, + PA12203001_PX_EN_MASK, enable); + if (ret < 0) + return ret; + + data->px_enabled = !!enable; + + return 0; +} + +static int pa12203001_set_power_state(struct pa12203001_data *data, bool on, + u8 mask) +{ +#ifdef CONFIG_PM + int ret; + + if (on && (mask & PA12203001_ALS_EN_MASK)) { + mutex_lock(&data->lock); + if (data->px_enabled) { + ret = pa12203001_als_enable(data, + PA12203001_ALS_EN_MASK); + if (ret < 0) + goto err; + } else { + data->als_needs_enable = true; + } + mutex_unlock(&data->lock); + } + + if (on && (mask & PA12203001_PX_EN_MASK)) { + mutex_lock(&data->lock); + if (data->als_enabled) { + ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK); + if (ret < 0) + goto err; + } else { + data->px_needs_enable = true; + } + mutex_unlock(&data->lock); + } + + 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; + +err: + mutex_unlock(&data->lock); + return ret; + +#endif + return 0; +} + +static int pa12203001_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct pa12203001_data *data = iio_priv(indio_dev); + int ret; + u8 dev_mask; + unsigned int reg_byte; + __le16 reg_word; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_LIGHT: + dev_mask = PA12203001_ALS_EN_MASK; + ret = pa12203001_set_power_state(data, true, dev_mask); + if (ret < 0) + return ret; + /* + * ALS ADC value is stored in registers + * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1. + */ + ret = regmap_bulk_read(data->map, PA12203001_REG_ADL, + ®_word, 2); + if (ret < 0) + goto reg_err; + + *val = le16_to_cpu(reg_word); + ret = pa12203001_set_power_state(data, false, dev_mask); + if (ret < 0) + return ret; + break; + case IIO_PROXIMITY: + dev_mask = PA12203001_PX_EN_MASK; + ret = pa12203001_set_power_state(data, true, dev_mask); + if (ret < 0) + return ret; + ret = regmap_read(data->map, PA12203001_REG_PDH, + ®_byte); + if (ret < 0) + goto reg_err; + + *val = reg_byte; + ret = pa12203001_set_power_state(data, false, dev_mask); + if (ret < 0) + return ret; + break; + default: + return -EINVAL; + } + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); + if (ret < 0) + return ret; + *val = 0; + reg_byte = (reg_byte & PA12203001_AFSR_MASK); + *val2 = pa12203001_scales[reg_byte >> 4]; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + +reg_err: + pa12203001_set_power_state(data, false, dev_mask); + return ret; +} + +static int pa12203001_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, + int val2, long mask) +{ + struct pa12203001_data *data = iio_priv(indio_dev); + int i, ret, new_val; + unsigned int reg_byte; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte); + if (val != 0 || ret < 0) + return -EINVAL; + for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) { + if (val2 == pa12203001_scales[i]) { + new_val = i << PA12203001_AFSR_SHIFT; + return regmap_update_bits(data->map, + PA12203001_REG_CFG0, + PA12203001_AFSR_MASK, + new_val); + } + } + break; + default: + break; + } + + return -EINVAL; +} + +static const struct iio_info pa12203001_info = { + .read_raw = pa12203001_read_raw, + .write_raw = pa12203001_write_raw, + .attrs = &pa12203001_attr_group, +}; + +static int pa12203001_init(struct iio_dev *indio_dev) +{ + struct pa12203001_data *data = iio_priv(indio_dev); + int i, ret; + + for (i = 0; i < ARRAY_SIZE(regvals); i++) { + ret = regmap_write(data->map, regvals[i].reg, regvals[i].val); + if (ret < 0) + return ret; + } + + return 0; +} + +static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state) +{ + struct pa12203001_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->lock); + ret = pa12203001_als_enable(data, state); + if (ret < 0) + goto out; + + ret = pa12203001_px_enable(data, state); + +out: + mutex_unlock(&data->lock); + return ret; +} + +static int pa12203001_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pa12203001_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, + sizeof(struct pa12203001_data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + + data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config); + if (IS_ERR(data->map)) + return PTR_ERR(data->map); + + mutex_init(&data->lock); + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &pa12203001_info; + indio_dev->name = PA12203001_DRIVER_NAME; + indio_dev->channels = pa12203001_channels; + indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = pa12203001_init(indio_dev); + if (ret < 0) + return ret; + + ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); + if (ret < 0) + return ret; + + ret = pm_runtime_set_active(&client->dev); + if (ret < 0) + goto out_err; + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, + PA12203001_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(&client->dev); + + ret = iio_device_register(indio_dev); + if (ret < 0) + goto out_err; + + return 0; + +out_err: + pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); + return ret; +} + +static int pa12203001_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + + return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); +} + +#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) +static int pa12203001_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + + return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE); +} +#endif + +#ifdef CONFIG_PM_SLEEP +static int pa12203001_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + + return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE); +} +#endif + +#ifdef CONFIG_PM +static int pa12203001_runtime_resume(struct device *dev) +{ + struct pa12203001_data *data; + + data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + mutex_lock(&data->lock); + if (data->als_needs_enable) { + pa12203001_als_enable(data, PA12203001_ALS_EN_MASK); + data->als_needs_enable = false; + } + if (data->px_needs_enable) { + pa12203001_px_enable(data, PA12203001_PX_EN_MASK); + data->px_needs_enable = false; + } + mutex_unlock(&data->lock); + + return 0; +} +#endif + +static const struct dev_pm_ops pa12203001_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume) + SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL) +}; + +static const struct acpi_device_id pa12203001_acpi_match[] = { + { "TXCPA122", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match); + +static const struct i2c_device_id pa12203001_id[] = { + {"txcpa122", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, pa12203001_id); + +static struct i2c_driver pa12203001_driver = { + .driver = { + .name = PA12203001_DRIVER_NAME, + .pm = &pa12203001_pm_ops, + .acpi_match_table = ACPI_PTR(pa12203001_acpi_match), + }, + .probe = pa12203001_probe, + .remove = pa12203001_remove, + .id_table = pa12203001_id, + +}; +module_i2c_driver(pa12203001_driver); + +MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>"); +MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor"); +MODULE_LICENSE("GPL v2"); |