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![Adriana Reus](/assets/img/avatar_default.png)
Make sure we poweroff the chip if for any reason iio_register returns an error. Signed-off-by: Adriana Reus <adriana.reus@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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* To do: Interrupt support.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#define PA12203001_DRIVER_NAME "pa12203001"
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#define PA12203001_REG_CFG0 0x00
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#define PA12203001_REG_CFG1 0x01
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#define PA12203001_REG_CFG2 0x02
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#define PA12203001_REG_CFG3 0x03
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#define PA12203001_REG_ADL 0x0b
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#define PA12203001_REG_PDH 0x0e
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#define PA12203001_REG_POFS 0x10
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#define PA12203001_REG_PSET 0x11
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#define PA12203001_ALS_EN_MASK BIT(0)
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#define PA12203001_PX_EN_MASK BIT(1)
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#define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)
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#define PA12203001_AFSR_MASK GENMASK(5, 4)
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#define PA12203001_AFSR_SHIFT 4
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#define PA12203001_PSCAN 0x03
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/* als range 31000, ps, als disabled */
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#define PA12203001_REG_CFG0_DEFAULT 0x30
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/* led current: 100 mA */
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#define PA12203001_REG_CFG1_DEFAULT 0x20
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/* ps mode: normal, interrupts not active */
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#define PA12203001_REG_CFG2_DEFAULT 0xcc
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#define PA12203001_REG_CFG3_DEFAULT 0x00
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#define PA12203001_SLEEP_DELAY_MS 3000
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#define PA12203001_CHIP_ENABLE 0xff
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#define PA12203001_CHIP_DISABLE 0x00
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/* available scales: corresponding to [500, 4000, 7000, 31000] lux */
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static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};
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struct pa12203001_data {
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struct i2c_client *client;
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/* protect device states */
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struct mutex lock;
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bool als_enabled;
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bool px_enabled;
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bool als_needs_enable;
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bool px_needs_enable;
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struct regmap *map;
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};
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static const struct {
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u8 reg;
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u8 val;
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} regvals[] = {
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{PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
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{PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
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{PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
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{PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
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{PA12203001_REG_PSET, PA12203001_PSCAN},
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};
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static IIO_CONST_ATTR(in_illuminance_scale_available,
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"0.007629 0.061036 0.106813 0.473029");
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static struct attribute *pa12203001_attrs[] = {
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&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group pa12203001_attr_group = {
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.attrs = pa12203001_attrs,
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};
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static const struct iio_chan_spec pa12203001_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}
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};
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static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
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regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
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regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
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};
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static const struct regmap_access_table pa12203001_volatile_regs = {
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.yes_ranges = pa12203001_volatile_regs_ranges,
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.n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
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};
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static const struct regmap_config pa12203001_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = PA12203001_REG_PSET,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &pa12203001_volatile_regs,
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};
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static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
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{
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int ret;
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ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
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PA12203001_ALS_EN_MASK, enable);
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if (ret < 0)
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return ret;
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data->als_enabled = !!enable;
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return 0;
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}
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static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
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{
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int ret;
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ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
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PA12203001_PX_EN_MASK, enable);
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if (ret < 0)
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return ret;
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data->px_enabled = !!enable;
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return 0;
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}
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static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
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u8 mask)
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{
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#ifdef CONFIG_PM
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int ret;
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if (on && (mask & PA12203001_ALS_EN_MASK)) {
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mutex_lock(&data->lock);
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if (data->px_enabled) {
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ret = pa12203001_als_enable(data,
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PA12203001_ALS_EN_MASK);
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if (ret < 0)
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goto err;
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} else {
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data->als_needs_enable = true;
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}
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mutex_unlock(&data->lock);
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}
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if (on && (mask & PA12203001_PX_EN_MASK)) {
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mutex_lock(&data->lock);
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if (data->als_enabled) {
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ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
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if (ret < 0)
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goto err;
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} else {
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data->px_needs_enable = true;
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}
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mutex_unlock(&data->lock);
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}
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if (on) {
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ret = pm_runtime_get_sync(&data->client->dev);
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if (ret < 0)
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pm_runtime_put_noidle(&data->client->dev);
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} else {
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pm_runtime_mark_last_busy(&data->client->dev);
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ret = pm_runtime_put_autosuspend(&data->client->dev);
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}
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return ret;
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err:
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mutex_unlock(&data->lock);
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return ret;
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#endif
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return 0;
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}
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static int pa12203001_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct pa12203001_data *data = iio_priv(indio_dev);
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int ret;
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u8 dev_mask;
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unsigned int reg_byte;
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__le16 reg_word;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_LIGHT:
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dev_mask = PA12203001_ALS_EN_MASK;
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ret = pa12203001_set_power_state(data, true, dev_mask);
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if (ret < 0)
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return ret;
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/*
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* ALS ADC value is stored in registers
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* PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
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*/
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ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
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®_word, 2);
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if (ret < 0)
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goto reg_err;
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*val = le16_to_cpu(reg_word);
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ret = pa12203001_set_power_state(data, false, dev_mask);
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if (ret < 0)
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return ret;
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break;
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case IIO_PROXIMITY:
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dev_mask = PA12203001_PX_EN_MASK;
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ret = pa12203001_set_power_state(data, true, dev_mask);
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if (ret < 0)
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return ret;
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ret = regmap_read(data->map, PA12203001_REG_PDH,
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®_byte);
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if (ret < 0)
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goto reg_err;
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*val = reg_byte;
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ret = pa12203001_set_power_state(data, false, dev_mask);
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);
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if (ret < 0)
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return ret;
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*val = 0;
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reg_byte = (reg_byte & PA12203001_AFSR_MASK);
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*val2 = pa12203001_scales[reg_byte >> 4];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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reg_err:
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pa12203001_set_power_state(data, false, dev_mask);
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return ret;
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}
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static int pa12203001_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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struct pa12203001_data *data = iio_priv(indio_dev);
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int i, ret, new_val;
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unsigned int reg_byte;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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ret = regmap_read(data->map, PA12203001_REG_CFG0, ®_byte);
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if (val != 0 || ret < 0)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
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if (val2 == pa12203001_scales[i]) {
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new_val = i << PA12203001_AFSR_SHIFT;
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return regmap_update_bits(data->map,
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PA12203001_REG_CFG0,
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PA12203001_AFSR_MASK,
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new_val);
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}
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}
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break;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct iio_info pa12203001_info = {
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.driver_module = THIS_MODULE,
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.read_raw = pa12203001_read_raw,
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.write_raw = pa12203001_write_raw,
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.attrs = &pa12203001_attr_group,
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};
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static int pa12203001_init(struct iio_dev *indio_dev)
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{
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struct pa12203001_data *data = iio_priv(indio_dev);
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int i, ret;
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for (i = 0; i < ARRAY_SIZE(regvals); i++) {
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ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
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{
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struct pa12203001_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->lock);
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ret = pa12203001_als_enable(data, state);
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if (ret < 0)
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goto out;
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ret = pa12203001_px_enable(data, state);
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out:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int pa12203001_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pa12203001_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev,
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sizeof(struct pa12203001_data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
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if (IS_ERR(data->map))
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return PTR_ERR(data->map);
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &pa12203001_info;
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indio_dev->name = PA12203001_DRIVER_NAME;
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indio_dev->channels = pa12203001_channels;
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indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = pa12203001_init(indio_dev);
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if (ret < 0)
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return ret;
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ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
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if (ret < 0)
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return ret;
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ret = pm_runtime_set_active(&client->dev);
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if (ret < 0)
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goto out_err;
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pm_runtime_enable(&client->dev);
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pm_runtime_set_autosuspend_delay(&client->dev,
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PA12203001_SLEEP_DELAY_MS);
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pm_runtime_use_autosuspend(&client->dev);
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ret = iio_device_register(indio_dev);
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if (ret < 0)
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goto out_err;
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return 0;
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out_err:
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pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
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return ret;
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}
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static int pa12203001_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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pm_runtime_disable(&client->dev);
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pm_runtime_set_suspended(&client->dev);
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return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
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}
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#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
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static int pa12203001_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
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}
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#endif
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#ifdef CONFIG_PM_SLEEP
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static int pa12203001_resume(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
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}
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#endif
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#ifdef CONFIG_PM
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static int pa12203001_runtime_resume(struct device *dev)
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{
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struct pa12203001_data *data;
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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mutex_lock(&data->lock);
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if (data->als_needs_enable) {
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pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
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data->als_needs_enable = false;
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}
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if (data->px_needs_enable) {
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pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
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data->px_needs_enable = false;
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}
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mutex_unlock(&data->lock);
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return 0;
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}
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#endif
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static const struct dev_pm_ops pa12203001_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
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SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
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};
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static const struct acpi_device_id pa12203001_acpi_match[] = {
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{ "TXCPA122", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);
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static const struct i2c_device_id pa12203001_id[] = {
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{"txcpa122", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pa12203001_id);
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static struct i2c_driver pa12203001_driver = {
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.driver = {
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.name = PA12203001_DRIVER_NAME,
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.pm = &pa12203001_pm_ops,
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.acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
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},
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.probe = pa12203001_probe,
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.remove = pa12203001_remove,
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.id_table = pa12203001_id,
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};
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module_i2c_driver(pa12203001_driver);
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MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
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MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
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MODULE_LICENSE("GPL v2");
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