diff options
Diffstat (limited to 'drivers/iio/light/tcs3472.c')
| -rw-r--r-- | drivers/iio/light/tcs3472.c | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c deleted file mode 100644 index 45df220..0000000 --- a/drivers/iio/light/tcs3472.c +++ /dev/null @@ -1,367 +0,0 @@ -/* - * tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter - * - * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net> - * - * This file is subject to the terms and conditions of version 2 of - * the GNU General Public License. See the file COPYING in the main - * directory of this archive for more details. - * - * Color light sensor with 16-bit channels for red, green, blue, clear); - * 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725, - * TCS34727) - * - * TODO: interrupt support, thresholds, wait time - */ - -#include <linux/module.h> -#include <linux/i2c.h> -#include <linux/delay.h> -#include <linux/pm.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include <linux/iio/trigger_consumer.h> -#include <linux/iio/buffer.h> -#include <linux/iio/triggered_buffer.h> - -#define TCS3472_DRV_NAME "tcs3472" - -#define TCS3472_COMMAND BIT(7) -#define TCS3472_AUTO_INCR BIT(5) - -#define TCS3472_ENABLE (TCS3472_COMMAND | 0x00) -#define TCS3472_ATIME (TCS3472_COMMAND | 0x01) -#define TCS3472_WTIME (TCS3472_COMMAND | 0x03) -#define TCS3472_AILT (TCS3472_COMMAND | 0x04) -#define TCS3472_AIHT (TCS3472_COMMAND | 0x06) -#define TCS3472_PERS (TCS3472_COMMAND | 0x0c) -#define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d) -#define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f) -#define TCS3472_ID (TCS3472_COMMAND | 0x12) -#define TCS3472_STATUS (TCS3472_COMMAND | 0x13) -#define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14) -#define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16) -#define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18) -#define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a) - -#define TCS3472_STATUS_AVALID BIT(0) -#define TCS3472_ENABLE_AEN BIT(1) -#define TCS3472_ENABLE_PON BIT(0) -#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1)) - -struct tcs3472_data { - struct i2c_client *client; - u8 enable; - u8 control; - u8 atime; - u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */ -}; - -#define TCS3472_CHANNEL(_color, _si, _addr) { \ - .type = IIO_INTENSITY, \ - .modified = 1, \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBSCALE) | \ - BIT(IIO_CHAN_INFO_INT_TIME), \ - .channel2 = IIO_MOD_LIGHT_##_color, \ - .address = _addr, \ - .scan_index = _si, \ - .scan_type = IIO_ST('u', 16, 16, 0), \ -} - -static const int tcs3472_agains[] = { 1, 4, 16, 60 }; - -static const struct iio_chan_spec tcs3472_channels[] = { - TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA), - TCS3472_CHANNEL(RED, 1, TCS3472_RDATA), - TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA), - TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA), - IIO_CHAN_SOFT_TIMESTAMP(4), -}; - -static int tcs3472_req_data(struct tcs3472_data *data) -{ - int tries = 50; - int ret; - - while (tries--) { - ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS); - if (ret < 0) - return ret; - if (ret & TCS3472_STATUS_AVALID) - break; - msleep(20); - } - - if (tries < 0) { - dev_err(&data->client->dev, "data not ready\n"); - return -EIO; - } - - return 0; -} - -static int tcs3472_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, int *val2, long mask) -{ - struct tcs3472_data *data = iio_priv(indio_dev); - int ret; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - ret = tcs3472_req_data(data); - if (ret < 0) - return ret; - ret = i2c_smbus_read_word_data(data->client, chan->address); - if (ret < 0) - return ret; - *val = ret; - return IIO_VAL_INT; - case IIO_CHAN_INFO_CALIBSCALE: - *val = tcs3472_agains[data->control & - TCS3472_CONTROL_AGAIN_MASK]; - return IIO_VAL_INT; - case IIO_CHAN_INFO_INT_TIME: - *val = 0; - *val2 = (256 - data->atime) * 2400; - return IIO_VAL_INT_PLUS_MICRO; - } - return -EINVAL; -} - -static int tcs3472_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, int val2, long mask) -{ - struct tcs3472_data *data = iio_priv(indio_dev); - int i; - - switch (mask) { - case IIO_CHAN_INFO_CALIBSCALE: - if (val2 != 0) - return -EINVAL; - for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) { - if (val == tcs3472_agains[i]) { - data->control &= ~TCS3472_CONTROL_AGAIN_MASK; - data->control |= i; - return i2c_smbus_write_byte_data( - data->client, TCS3472_CONTROL, - data->control); - } - } - return -EINVAL; - case IIO_CHAN_INFO_INT_TIME: - if (val != 0) - return -EINVAL; - for (i = 0; i < 256; i++) { - if (val2 == (256 - i) * 2400) { - data->atime = i; - return i2c_smbus_write_word_data( - data->client, TCS3472_ATIME, - data->atime); - } - - } - return -EINVAL; - } - return -EINVAL; -} - -static irqreturn_t tcs3472_trigger_handler(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct tcs3472_data *data = iio_priv(indio_dev); - int len = 0; - int i, j = 0; - - int ret = tcs3472_req_data(data); - if (ret < 0) - goto done; - - for_each_set_bit(i, indio_dev->active_scan_mask, - indio_dev->masklength) { - ret = i2c_smbus_read_word_data(data->client, - TCS3472_CDATA + 2*i); - if (ret < 0) - goto done; - - data->buffer[j++] = ret; - len += 2; - } - - iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, - iio_get_time_ns()); - -done: - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -static ssize_t tcs3472_show_int_time_available(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - size_t len = 0; - int i; - - for (i = 1; i <= 256; i++) - len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ", - 2400 * i); - - /* replace trailing space by newline */ - buf[len - 1] = '\n'; - - return len; -} - -static IIO_CONST_ATTR(calibscale_available, "1 4 16 60"); -static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available); - -static struct attribute *tcs3472_attributes[] = { - &iio_const_attr_calibscale_available.dev_attr.attr, - &iio_dev_attr_integration_time_available.dev_attr.attr, - NULL -}; - -static const struct attribute_group tcs3472_attribute_group = { - .attrs = tcs3472_attributes, -}; - -static const struct iio_info tcs3472_info = { - .read_raw = tcs3472_read_raw, - .write_raw = tcs3472_write_raw, - .attrs = &tcs3472_attribute_group, - .driver_module = THIS_MODULE, -}; - -static int tcs3472_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct tcs3472_data *data; - struct iio_dev *indio_dev; - int ret; - - indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); - if (indio_dev == NULL) - return -ENOMEM; - - data = iio_priv(indio_dev); - i2c_set_clientdata(client, indio_dev); - data->client = client; - - indio_dev->dev.parent = &client->dev; - indio_dev->info = &tcs3472_info; - indio_dev->name = TCS3472_DRV_NAME; - indio_dev->channels = tcs3472_channels; - indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels); - indio_dev->modes = INDIO_DIRECT_MODE; - - ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID); - if (ret < 0) - return ret; - - if (ret == 0x44) - dev_info(&client->dev, "TCS34721/34725 found\n"); - else if (ret == 0x4d) - dev_info(&client->dev, "TCS34723/34727 found\n"); - else - return -ENODEV; - - ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL); - if (ret < 0) - return ret; - data->control = ret; - - ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME); - if (ret < 0) - return ret; - data->atime = ret; - - ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE); - if (ret < 0) - return ret; - - /* enable device */ - data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN; - ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, - data->enable); - if (ret < 0) - return ret; - - ret = iio_triggered_buffer_setup(indio_dev, NULL, - tcs3472_trigger_handler, NULL); - if (ret < 0) - return ret; - - ret = iio_device_register(indio_dev); - if (ret < 0) - goto buffer_cleanup; - - return 0; - -buffer_cleanup: - iio_triggered_buffer_cleanup(indio_dev); - return ret; -} - -static int tcs3472_powerdown(struct tcs3472_data *data) -{ - return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, - data->enable & ~(TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); -} - -static int tcs3472_remove(struct i2c_client *client) -{ - struct iio_dev *indio_dev = i2c_get_clientdata(client); - - iio_device_unregister(indio_dev); - iio_triggered_buffer_cleanup(indio_dev); - tcs3472_powerdown(iio_priv(indio_dev)); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int tcs3472_suspend(struct device *dev) -{ - struct tcs3472_data *data = iio_priv(i2c_get_clientdata( - to_i2c_client(dev))); - return tcs3472_powerdown(data); -} - -static int tcs3472_resume(struct device *dev) -{ - struct tcs3472_data *data = iio_priv(i2c_get_clientdata( - to_i2c_client(dev))); - return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE, - data->enable | (TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON)); -} -#endif - -static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume); - -static const struct i2c_device_id tcs3472_id[] = { - { "tcs3472", 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, tcs3472_id); - -static struct i2c_driver tcs3472_driver = { - .driver = { - .name = TCS3472_DRV_NAME, - .pm = &tcs3472_pm_ops, - .owner = THIS_MODULE, - }, - .probe = tcs3472_probe, - .remove = tcs3472_remove, - .id_table = tcs3472_id, -}; -module_i2c_driver(tcs3472_driver); - -MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); -MODULE_DESCRIPTION("TCS3472 color light sensors driver"); -MODULE_LICENSE("GPL"); |