[PATCH] iio: light: Add support for TXC PA12 als and proximity sensor

From: Adriana Reus
Date: Thu Jun 25 2015 - 06:29:00 EST

Add support for TXC PA12203001 als and proximity sensor.
Support for raw illuminance and proximity readings.

Signed-off-by: Adriana Reus <adriana.reus@xxxxxxxxx>
---
drivers/iio/light/Kconfig | 11 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/pa12203001.c | 501 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 513 insertions(+)
create mode 100644 drivers/iio/light/pa12203001.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index e6198b7..30fd835 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -198,6 +198,17 @@ config LTR501
This driver can also be built as a module. If so, the module
will be called ltr501.

+config PA12203001
+ tristate "TXC PA12203001 light and proximity sensor"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ If you say yes here you get support for the TXC PA12203001
+ ambient light and proximity sensor.
+
+ This driver can also be built as a module. If so, the module
+ will be called pa12203001.
+
config STK3310
tristate "STK3310 ALS and proximity sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index e2d50fd..257fabd 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o
obj-$(CONFIG_JSA1212) += jsa1212.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_LTR501) += ltr501.o
+obj-$(CONFIG_PA12203001) += pa12203001.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
obj-$(CONFIG_STK3310) += stk3310.o
obj-$(CONFIG_TCS3414) += tcs3414.o
diff --git a/drivers/iio/light/pa12203001.c b/drivers/iio/light/pa12203001.c
new file mode 100644
index 0000000..03bee4c
--- /dev/null
+++ b/drivers/iio/light/pa12203001.c
@@ -0,0 +1,501 @@
+/*
+ * 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 (BIT(7) | BIT(6))
+#define PA12203001_AFSR_MASK (BIT(5) | BIT(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 0x10
+
+/* ps mode: normal, interrupts not active */
+#define PA12203001_REG_CFG2_DEFAULT 0xcc
+
+#define PA12203001_REG_CFG3_DEFAULT 0x00
+
+#define PA12203001_SLEEP_DELAY_MS 3000
+
+/* 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 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;
+
+ mutex_lock(&data->lock);
+ if (on && (mask & PA12203001_ALS_EN_MASK)) {
+ if (data->px_enabled) {
+ ret = pa12203001_als_enable(data,
+ PA12203001_ALS_EN_MASK);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ } else {
+ data->als_needs_enable = true;
+ }
+ }
+
+ if (on && (mask & PA12203001_PX_EN_MASK)) {
+ if (data->als_enabled) {
+ ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ } else {
+ data->px_needs_enable = true;
+ }
+ }
+ mutex_unlock(&data->lock);
+
+ if (on) {
+ /* Get reference and resume */
+ ret = pm_runtime_get_sync(&data->client->dev);
+ if (ret < 0)
+ pm_runtime_put_noidle(&data->client->dev);
+
+ } else {
+ /*
+ * Turning off - restart timer, drop reference
+ * and setup autosuspend
+ */
+ pm_runtime_mark_last_busy(&data->client->dev);
+ ret = pm_runtime_put_autosuspend(&data->client->dev);
+ }
+ 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,
+ &reg_word, 2);
+ if (ret < 0)
+ return ret;
+ *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,
+ &reg_byte);
+ if (ret < 0)
+ return ret;
+ *val = reg_byte;
+ ret = pa12203001_set_power_state(data, false, dev_mask);
+ if (ret < 0)
+ return ret;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_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:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+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;
+ unsigned int reg_byte;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
+ if (val != 0 || ret < 0)
+ return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
+ if (val2 == pa12203001_scales[i])
+ return regmap_update_bits(data->map,
+ PA12203001_REG_CFG0,
+ PA12203001_AFSR_MASK,
+ (i << 4));
+ }
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_info pa12203001_info = {
+ .driver_module = THIS_MODULE,
+ .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 ret;
+
+ ret = regmap_write(data->map, PA12203001_REG_CFG0,
+ PA12203001_REG_CFG0_DEFAULT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->map, PA12203001_REG_CFG1,
+ PA12203001_REG_CFG1_DEFAULT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->map, PA12203001_REG_CFG2,
+ PA12203001_REG_CFG2_DEFAULT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->map, PA12203001_REG_CFG3,
+ PA12203001_REG_CFG3_DEFAULT);
+ if (ret < 0)
+ return ret;
+
+ return regmap_write(data->map, PA12203001_REG_PSET,
+ PA12203001_PSCAN);
+}
+
+static int pa12203001_power_on(struct iio_dev *indio_dev)
+{
+ struct pa12203001_data *data = iio_priv(indio_dev);
+ int ret;
+ u8 enable = 0xff;
+
+ mutex_lock(&data->lock);
+ ret = pa12203001_als_enable(data, enable);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = pa12203001_px_enable(data, enable);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ mutex_unlock(&data->lock);
+ return 0;
+}
+
+static int pa12203001_power_off(struct iio_dev *indio_dev)
+{
+ struct pa12203001_data *data = iio_priv(indio_dev);
+ int ret;
+ u8 disable = 0x00;
+
+ mutex_lock(&data->lock);
+ ret = pa12203001_als_enable(data, disable);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = pa12203001_px_enable(data, disable);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ mutex_unlock(&data->lock);
+ return 0;
+}
+
+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_on(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ ret = pm_runtime_set_active(&client->dev);
+ if (ret < 0) {
+ pa12203001_power_off(indio_dev);
+ return ret;
+ }
+
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev,
+ PA12203001_SLEEP_DELAY_MS);
+ pm_runtime_use_autosuspend(&client->dev);
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int pa12203001_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+
+ return pa12203001_power_off(indio_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pa12203001_suspend(struct device *dev)
+{
+ return pa12203001_power_off(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+static int pa12203001_resume(struct device *dev)
+{
+ return pa12203001_power_on(i2c_get_clientdata(to_i2c_client(dev)));
+}
+#endif
+
+#ifdef CONFIG_PM
+static int pa12203001_runtime_suspend(struct device *dev)
+{
+ return pa12203001_power_off(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+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_runtime_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@xxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
+MODULE_LICENSE("GPL v2");
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/