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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html