This patch add a new driver for Capella CM36651 proximity and RGB light
sensor.
The driver exposes two channels: light and proximity. It also support
detection proximity event.
This driver supports:
- events - rising and falling proximity events.
- reading channels through read_raw callback.
Signed-off-by: Beomho Seo <beomho.seo@xxxxxxxxxxx>
---
drivers/iio/light/Kconfig | 11 +
drivers/iio/light/cm36651.c | 607
+++++++++++++++++++++++++++++++++++++++++++
2 files changed, 618 insertions(+)
create mode 100644 drivers/iio/light/cm36651.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index bf9fa0d..66fb76f 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -75,4 +75,15 @@ config VCNL4000
To compile this driver as a module, choose M here: the
module will be called vcnl4000.
+config CM36651
+ depends on I2C
+ tristate "CM36651 driver"
+ help
+ Say Y here if you use cm36651.
+ This option enables proximity & RGB sensor using
+ Capella cm36651 device driver.
+
+ To compile this driver as a module, choose M here:
+ the module will be called cm36651.
+
endmenu
diff --git a/drivers/iio/light/cm36651.c b/drivers/iio/light/cm36651.c
new file mode 100644
index 0000000..b3e1f0d
--- /dev/null
+++ b/drivers/iio/light/cm36651.c
@@ -0,0 +1,607 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Beomho Seo <beomho.seo@xxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+/* slave address 0x19 for PS of 7 bit addressing protocol for I2C */
+#define CM36651_I2C_ADDR_PS 0x19
+
+/* Ambient light sensor */
+#define CS_CONF1 0x00
+#define CS_CONF2 0x01
+#define CS_CONF3 0x06
+
+#define RED 0x00
+#define GREEN 0x01
+#define BLUE 0x02
+#define WHITE 0x03
+
+/* Proximity sensor */
+#define PS_CONF1 0x00
+#define PS_THD 0x01
+#define PS_CANC 0x02
+#define PS_CONF2 0x03
+
+#define ALS_REG_NUM 3
+#define PS_REG_NUM 4
+#define ALS_CHANNEL_NUM 4
+#define INITIAL_THD 0x09
+#define SCAN_MODE_LIGHT 0
+#define SCAN_MODE_PROX 1
+
+enum {
+ CM36651_LIGHT_EN,
+ CM36651_PROXIMITY_EN,
+ CM36651_PROXIMITY_EV_EN,
+};
+
+enum cm36651_cmd {
+ CM36651_CMD_READ_RAW_LIGHT,
+ CM36651_CMD_READ_RAW_PROXIMITY,
+ CM36651_CMD_PROX_EV_EN,
+ CM36651_CMD_PROX_EV_DIS,
+};
+
+enum {
+ CM36651_CLOSE_PROXIMITY,
+ CM36651_FAR_PROXIMITY,
+};
+
+/* register settings */
+static const u8 als_reg_setting[ALS_REG_NUM][2] = {
+ { 0x00, 0x04 }, /* CS_CONF1 */
+ { 0x01, 0x08 }, /* CS_CONF2 */
+ { 0x06, 0x00 } /* CS_CONF3 */
+};
+
+static const u8 ps_reg_setting[PS_REG_NUM][2] = {
+ { 0x00, 0x3C }, /* PS_CONF1 */
+ { 0x01, 0x09 }, /* PS_THD */
+ { 0x02, 0x00 }, /* PS_CANC */
+ { 0x03, 0x13 }, /* PS_CONF2 */
+};
+
+struct cm36651_data {
+ const struct cm36651_platform_data *pdata;
+ struct i2c_client *client;
+ struct i2c_client *ps_client;
+ struct mutex lock;
+ struct regulator *vled_reg;
+ unsigned long flags;
+ u8 thres;
+ u16 color[4];
+};
+
+int cm36651_i2c_read_byte(struct i2c_client *client, u8 *val)
+{
+ int ret = 0;
+ struct i2c_msg msg[1];
+
+ if (!client->adapter)
+ return -ENODEV;
+
+ /* send slave address & command */
+ msg->addr = client->addr;
+ msg->flags = I2C_M_RD;
+ msg->len = 1;
+ msg->buf = val;
+
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1) {
+ dev_err(&client->dev, "i2c transfer error ret: %d\n", ret);
+ ret = -EIO;
+ }
+
+ return ret;
+}
+
+int cm36651_i2c_read_word(struct i2c_client *client, u8 command, u16 *val)
+{
+ int ret = 0;
+ struct i2c_msg msg[2];
+ unsigned char data[2] = { 0, };
+
+ if (!client->adapter)
+ return -ENODEV;
+
+ /* send slave address & command */
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = &command;
+
+ /* read word data */
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = 2;
+ msg[1].buf = data;
+
+ ret = i2c_transfer(client->adapter, msg, 2);
+ if (ret != 2) {
+ dev_err(&client->dev, "i2c transfer error ret: %d\n", ret);
+ ret = -EIO;
+ }
+ *val = le16_to_cpup((__le16 *)data);
+
+ return ret;
+}
+
+int cm36651_i2c_write_byte(struct i2c_client *client, u8 command, u8 val)
+{
+ int ret;
+ struct i2c_msg msg[1];
+ unsigned char data[2] = { command, val };
+
+ if (!client->adapter)
+ return -ENODEV;
+
+ /* send slave address & command */
+ msg->addr = client->addr;
+ msg->flags = 0;
+ msg->len = 2;
+ msg->buf = data;
+
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1) {
+ dev_err(&client->dev, "i2c transfer error ret: %d\n", ret);
+ ret = -EIO;
+ }
+
+ return ret;
+}
+
+static int cm36651_setup_reg(struct cm36651_data *cm36651)
+{
+ struct i2c_client *client = cm36651->client;
+ int ret = 0, i = 0;
+ u8 tmp = 0;
+
+ /* ALS initialization */
+ for (i = 0; i < ALS_REG_NUM; i++) {
+ ret = cm36651_i2c_write_byte(client,
+ als_reg_setting[i][0], als_reg_setting[i][1]);
+ if (ret < 0)
+ goto err_setup_reg;
+ }
+
+ /* PS initialization */
+ for (i = 0; i < PS_REG_NUM; i++) {
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ ps_reg_setting[i][0], ps_reg_setting[i][1]);
+ if (ret < 0)
+ goto err_setup_reg;
+ }
+
+ ret = cm36651_i2c_read_byte(cm36651->ps_client, &tmp);
+ if (ret < 0)
+ goto err_setup_reg;
+
+ /* printing the initial proximity value with no contact */
+ dev_dbg(&client->dev, "initial proximity value: %d\n", tmp);
+
+ /* device turn off */
+ ret = cm36651_i2c_write_byte(client, CS_CONF1, 0x01);
+ if (ret < 0)
+ goto err_setup_reg;
+
+ ret = cm36651_i2c_write_byte(cm36651->ps_client, PS_CONF1, 0x01);
+ if (ret < 0)
+ goto err_setup_reg;
+
+ return 0;
+
+err_setup_reg:
+ dev_err(&client->dev, "cm36651_setup_reg() failed: %d\n", ret);
+ return ret;
+}
+
+static int cm36651_read_output(struct cm36651_data *cm36651,
+ int scan_index, int *val)
+{
+ struct i2c_client *client = cm36651->client;
+ int i;
+ int ret = -EINVAL;
+ u8 prox_val;
+
+ switch (scan_index) {
+ case SCAN_MODE_LIGHT:
+ for (i = 0; i < ALS_CHANNEL_NUM; i++) {
+ ret = cm36651_i2c_read_word(client, i,
+ &cm36651->color[i]);
+ if (ret < 0)
+ goto read_err;
+ }
+
+ dev_dbg(&client->dev, "red: %d, green: %d, blue: %d, white: %d\n",
+ cm36651->color[0] + 1, cm36651->color[1] + 1,
+ cm36651->color[2] + 1, cm36651->color[3] + 1);
+
+ ret = cm36651_i2c_write_byte(client, CS_CONF1, 0x01);
+ if (ret < 0)
+ goto write_err;
+
+ break;
+ case SCAN_MODE_PROX:
+ ret = cm36651_i2c_read_byte(cm36651->ps_client, &prox_val);
+ if (ret < 0)
+ goto read_err;
+
+ dev_dbg(&client->dev, "proximity value: %d\n", prox_val);
+
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ PS_CONF1, 0x01);
+ if (ret < 0)
+ goto write_err;
+
+ break;
+ }
+
+ return ret;
+
+read_err:
+ dev_err(&client->dev, "register read failed\n");
+ return ret;
+
+write_err:
+ dev_err(&client->dev, "register write failed\n");
+ return ret;
+}
+
+static irqreturn_t cm36651_irq_handler(int irq, void *data)
+{
+ struct iio_dev *indio_dev = data;
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ struct i2c_client *client = cm36651->client;
+ int ev_dir, val, ret;
+ u64 ev_code;
+ u8 tmp;
+
+ ret = cm36651_i2c_read_byte(cm36651->ps_client, &tmp);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "%s: data read failed: %d\n", __func__, ret);
+ return IRQ_NONE;
+ }
+
+ if (tmp < ps_reg_setting[1][1]) {
+ ev_dir = IIO_EV_DIR_RISING;
+ val = CM36651_FAR_PROXIMITY;
+ } else {
+ ev_dir = IIO_EV_DIR_FALLING;
+ val = CM36651_CLOSE_PROXIMITY;
+ }
+
+ ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
+ CM36651_CMD_READ_RAW_PROXIMITY,
+ IIO_EV_TYPE_THRESH, ev_dir);
+
+ iio_push_event(indio_dev, ev_code, iio_get_time_ns());
+
+ return IRQ_HANDLED;
+}
+
+static int cm36651_set_operation_mode(struct cm36651_data *cm36651,
+ enum cm36651_cmd cmd)
+{
+ struct i2c_client *client = cm36651->client;
+ int ret = 0;
+ int i;
+
+ switch (cmd) {
+ case CM36651_CMD_READ_RAW_LIGHT:
+ ret = cm36651_i2c_write_byte(client, CS_CONF1, 0x04);
+ break;
+ case CM36651_CMD_READ_RAW_PROXIMITY:
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ PS_CONF1, 0x3C);
+ break;
+ case CM36651_CMD_PROX_EV_EN:
+ if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
+ dev_err(&client->dev,
+ "Already proximity event enable state\n");
+ return ret;
+ }
+ set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+ for (i = 0; i < 4; i++) {
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ ps_reg_setting[i][0], ps_reg_setting[i][1]);
+ if (ret < 0)
+ goto write_err;
+ }
+ enable_irq(client->irq);
+ break;
+ case CM36651_CMD_PROX_EV_DIS:
+ if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
+ dev_err(&client->dev,
+ "Already proximity event disable state\n");
+ return ret;
+ }
+ clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+ disable_irq(client->irq);
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ PS_CONF1, 0x01);
+ break;
+ }
+
+ if (ret < 0)
+ dev_err(&client->dev, "write register failed\n");
+
+ return ret;
+
+write_err:
+ dev_err(&client->dev, "proximity event toe enable is failed\n");
+ return ret;
+}
+
+static int cm36651_read_channel(struct cm36651_data *cm36651,
+ struct iio_chan_spec const *chan, int *val)
+{
+ struct i2c_client *client = cm36651->client;
+ enum cm36651_cmd cmd = 0;
+ int ret;
+
+ if (chan->scan_index == SCAN_MODE_LIGHT)
+ cmd = CM36651_CMD_READ_RAW_LIGHT;
+ else /* SCAN_MODE_PROX */
+ cmd = CM36651_CMD_READ_RAW_PROXIMITY;
+
+ ret = cm36651_set_operation_mode(cm36651, cmd);
+ if (ret < 0) {
+ dev_err(&client->dev, "cm36651 set operation mode failed\n");
+ return ret;
+ }
+ /* raw data integration time */
+ msleep(50);
+ ret = cm36651_read_output(cm36651, chan->scan_index, val);
+ if (ret < 0) {
+ dev_err(&client->dev, "cm36651 read output failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cm36651_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ mutex_lock(&cm36651->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = cm36651_read_channel(cm36651, chan, val);
+ break;
+ }
+ mutex_unlock(&cm36651->lock);
+
+ return ret;
+}
+
+static int cm36651_read_thresh(struct iio_dev *indio_dev,
+ u64 event_code, int *val)
+{
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ int chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code);
+ int event_type = IIO_EVENT_CODE_EXTRACT_TYPE(event_code);
+
+ if (event_type != IIO_EV_TYPE_THRESH || chan_type != IIO_PROXIMITY)
+ return -EINVAL;
+
+ if (!cm36651->thres)
+ *val = ps_reg_setting[1][1]; /* initial threshold value */
+ else
+ *val = cm36651->thres;
+
+ return 0;
+}
+
+static int cm36651_write_thresh(struct iio_dev *indio_dev,
+ u64 event_code, int val)
+{
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ struct i2c_client *client = cm36651->client;
+ int ret;
+
+ cm36651->thres = val;
+ ret = cm36651_i2c_write_byte(cm36651->ps_client,
+ PS_THD, cm36651->thres);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "PS register read faied: %d\n", ret);
+ return ret;
+ }
+ dev_dbg(&client->dev, "new threshold is 0x%x\n", cm36651->thres);
+
+ return 0;
+}
+
+static int cm36651_write_event_config(struct iio_dev *indio_dev,
+ u64 event_code, int state)
+{
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ enum cm36651_cmd cmd;
+ int chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code);
+ int ret = -EINVAL;
+
+ mutex_lock(&cm36651->lock);
+
+ if (chan_type == IIO_PROXIMITY) {
+ cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
+ ret = cm36651_set_operation_mode(cm36651, cmd);
+ }
+
+ mutex_unlock(&cm36651->lock);
+
+ return ret;
+}
+
+static int cm36651_read_event_config(struct iio_dev *indio_dev, u64
event_code)
+{
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+ int chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code);
+ int event_en = -EINVAL;
+
+ mutex_lock(&cm36651->lock);
+
+ if (chan_type == IIO_PROXIMITY)
+ event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
+
+ mutex_unlock(&cm36651->lock);
+
+ return event_en;
+}
+
+static const struct iio_chan_spec cm36651_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .shift = 0,
+ .storagebits = 16,
+ },
+ .scan_index = SCAN_MODE_LIGHT
+ },
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 8,
+ .shift = 0,
+ .storagebits = 8,
+ },
+ .scan_index = SCAN_MODE_PROX,
+ .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER)
+ },
+};
+
+static const struct iio_info cm36651_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &cm36651_read_raw,
+ .read_event_value = &cm36651_read_thresh,
+ .write_event_value = &cm36651_write_thresh,
+ .read_event_config = &cm36651_read_event_config,
+ .write_event_config = &cm36651_write_event_config,
+};
+
+static int cm36651_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cm36651_data *cm36651;
+ struct iio_dev *indio_dev;
+ unsigned long irqflag;
+ int ret;
+
+ dev_dbg(&client->dev, "cm36651 light/proxymity sensor probe\n");
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ cm36651 = iio_priv(indio_dev);
+
+ cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
+ if (IS_ERR(cm36651->vled_reg)) {
+ dev_err(&client->dev, "get regulator vled failed\n");
+ return PTR_ERR(cm36651->vled_reg);
+ }
+
+ ret = regulator_enable(cm36651->vled_reg);
+ if (ret) {
+ dev_err(&client->dev, "enable regulator failed\n");
+ return ret;
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+
+ cm36651->client = client;
+ cm36651->ps_client = i2c_new_dummy(client->adapter,
+ CM36651_I2C_ADDR_PS);
+ mutex_init(&cm36651->lock);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = cm36651_channels;
+ indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
+ indio_dev->info = &cm36651_info;
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = cm36651_setup_reg(cm36651);
+
+ irqflag = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
+ ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
+ irqflag, "cm36651_proximity", indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "%s: request irq failed\n", __func__);
+ return ret;
+ }
+ disable_irq(client->irq);
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ regulator_disable(cm36651->vled_reg);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cm36651_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct cm36651_data *cm36651 = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ regulator_disable(cm36651->vled_reg);
+ free_irq(client->irq, indio_dev);
+ iio_device_free(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id cm36651_id[] = {
+ { "cm36651", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, cm36651_id);
+
+static const struct of_device_id cm36651_of_match[] = {
+ { .compatible = "capella,cm36651" },
+ { }
+};
+
+static struct i2c_driver cm36651_driver = {
+ .driver = {
+ .name = "cm36651",
+ .of_match_table = of_match_ptr(cm36651_of_match),
+ .owner = THIS_MODULE,
+ },
+ .probe = cm36651_probe,
+ .remove = cm36651_remove,
+ .id_table = cm36651_id,
+};
+
+module_i2c_driver(cm36651_driver);
+
+MODULE_AUTHOR("Beomho Seo <beomho.seo@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
--
Beomho Seo, Assistant Engineer
System S/W Lab., S/W Platform Team, Software Center
Samsung Electronics
--
Beomho Seo, Assistant Engineer
System S/W Lab., S/W Platform Team, Software Center
Samsung Electronics
--
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