| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2015 Intel Corporation |
| * |
| * Driver for TXC PA12203001 Proximity and Ambient Light Sensor. |
| * |
| * 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"); |