X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fiio%2Flight%2Fadjd_s311.c;fp=kernel%2Fdrivers%2Fiio%2Flight%2Fadjd_s311.c;h=09ad5f1ce539a413e65084cac9032819d5b38cbf;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/iio/light/adjd_s311.c b/kernel/drivers/iio/light/adjd_s311.c new file mode 100644 index 000000000..09ad5f1ce --- /dev/null +++ b/kernel/drivers/iio/light/adjd_s311.c @@ -0,0 +1,321 @@ +/* + * adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor + * + * Copyright (C) 2012 Peter Meerwald + * + * 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. + * + * driver for ADJD-S311-CR999 digital color sensor (10-bit channels for + * red, green, blue, clear); 7-bit I2C slave address 0x74 + * + * limitations: no calibration, no offset mode, no sleep mode + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#define ADJD_S311_DRV_NAME "adjd_s311" + +#define ADJD_S311_CTRL 0x00 +#define ADJD_S311_CONFIG 0x01 +#define ADJD_S311_CAP_RED 0x06 +#define ADJD_S311_CAP_GREEN 0x07 +#define ADJD_S311_CAP_BLUE 0x08 +#define ADJD_S311_CAP_CLEAR 0x09 +#define ADJD_S311_INT_RED 0x0a +#define ADJD_S311_INT_GREEN 0x0c +#define ADJD_S311_INT_BLUE 0x0e +#define ADJD_S311_INT_CLEAR 0x10 +#define ADJD_S311_DATA_RED 0x40 +#define ADJD_S311_DATA_GREEN 0x42 +#define ADJD_S311_DATA_BLUE 0x44 +#define ADJD_S311_DATA_CLEAR 0x46 +#define ADJD_S311_OFFSET_RED 0x48 +#define ADJD_S311_OFFSET_GREEN 0x49 +#define ADJD_S311_OFFSET_BLUE 0x4a +#define ADJD_S311_OFFSET_CLEAR 0x4b + +#define ADJD_S311_CTRL_GOFS 0x02 +#define ADJD_S311_CTRL_GSSR 0x01 +#define ADJD_S311_CAP_MASK 0x0f +#define ADJD_S311_INT_MASK 0x0fff +#define ADJD_S311_DATA_MASK 0x03ff + +struct adjd_s311_data { + struct i2c_client *client; + u16 *buffer; +}; + +enum adjd_s311_channel_idx { + IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR +}; + +#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2) +#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2) +#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan)) + +static int adjd_s311_req_data(struct iio_dev *indio_dev) +{ + struct adjd_s311_data *data = iio_priv(indio_dev); + int tries = 10; + + int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL, + ADJD_S311_CTRL_GSSR); + if (ret < 0) + return ret; + + while (tries--) { + ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL); + if (ret < 0) + return ret; + if (!(ret & ADJD_S311_CTRL_GSSR)) + break; + msleep(20); + } + + if (tries < 0) { + dev_err(&data->client->dev, + "adjd_s311_req_data() failed, data not ready\n"); + return -EIO; + } + + return 0; +} + +static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val) +{ + struct adjd_s311_data *data = iio_priv(indio_dev); + + int ret = adjd_s311_req_data(indio_dev); + if (ret < 0) + return ret; + + ret = i2c_smbus_read_word_data(data->client, reg); + if (ret < 0) + return ret; + + *val = ret & ADJD_S311_DATA_MASK; + + return 0; +} + +static irqreturn_t adjd_s311_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct adjd_s311_data *data = iio_priv(indio_dev); + s64 time_ns = iio_get_time_ns(); + int i, j = 0; + + int ret = adjd_s311_req_data(indio_dev); + 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, + ADJD_S311_DATA_REG(i)); + if (ret < 0) + goto done; + + data->buffer[j++] = ret & ADJD_S311_DATA_MASK; + } + + iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, time_ns); + +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +#define ADJD_S311_CHANNEL(_color, _scan_idx) { \ + .type = IIO_INTENSITY, \ + .modified = 1, \ + .address = (IDX_##_color), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \ + BIT(IIO_CHAN_INFO_INT_TIME), \ + .channel2 = (IIO_MOD_LIGHT_##_color), \ + .scan_index = (_scan_idx), \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 10, \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ +} + +static const struct iio_chan_spec adjd_s311_channels[] = { + ADJD_S311_CHANNEL(RED, 0), + ADJD_S311_CHANNEL(GREEN, 1), + ADJD_S311_CHANNEL(BLUE, 2), + ADJD_S311_CHANNEL(CLEAR, 3), + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +static int adjd_s311_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct adjd_s311_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = adjd_s311_read_data(indio_dev, + ADJD_S311_DATA_REG(chan->address), val); + if (ret < 0) + return ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_HARDWAREGAIN: + ret = i2c_smbus_read_byte_data(data->client, + ADJD_S311_CAP_REG(chan->address)); + if (ret < 0) + return ret; + *val = ret & ADJD_S311_CAP_MASK; + return IIO_VAL_INT; + case IIO_CHAN_INFO_INT_TIME: + ret = i2c_smbus_read_word_data(data->client, + ADJD_S311_INT_REG(chan->address)); + if (ret < 0) + return ret; + *val = 0; + /* + * not documented, based on measurement: + * 4095 LSBs correspond to roughly 4 ms + */ + *val2 = ret & ADJD_S311_INT_MASK; + return IIO_VAL_INT_PLUS_MICRO; + } + return -EINVAL; +} + +static int adjd_s311_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adjd_s311_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + if (val < 0 || val > ADJD_S311_CAP_MASK) + return -EINVAL; + + return i2c_smbus_write_byte_data(data->client, + ADJD_S311_CAP_REG(chan->address), val); + case IIO_CHAN_INFO_INT_TIME: + if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK) + return -EINVAL; + + return i2c_smbus_write_word_data(data->client, + ADJD_S311_INT_REG(chan->address), val2); + } + return -EINVAL; +} + +static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct adjd_s311_data *data = iio_priv(indio_dev); + + kfree(data->buffer); + data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (data->buffer == NULL) + return -ENOMEM; + + return 0; +} + +static const struct iio_info adjd_s311_info = { + .read_raw = adjd_s311_read_raw, + .write_raw = adjd_s311_write_raw, + .update_scan_mode = adjd_s311_update_scan_mode, + .driver_module = THIS_MODULE, +}; + +static int adjd_s311_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adjd_s311_data *data; + struct iio_dev *indio_dev; + int err; + + 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 = &adjd_s311_info; + indio_dev->name = ADJD_S311_DRV_NAME; + indio_dev->channels = adjd_s311_channels; + indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + err = iio_triggered_buffer_setup(indio_dev, NULL, + adjd_s311_trigger_handler, NULL); + if (err < 0) + return err; + + err = iio_device_register(indio_dev); + if (err) + goto exit_unreg_buffer; + + dev_info(&client->dev, "ADJD-S311 color sensor registered\n"); + + return 0; + +exit_unreg_buffer: + iio_triggered_buffer_cleanup(indio_dev); + return err; +} + +static int adjd_s311_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct adjd_s311_data *data = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + kfree(data->buffer); + + return 0; +} + +static const struct i2c_device_id adjd_s311_id[] = { + { "adjd_s311", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adjd_s311_id); + +static struct i2c_driver adjd_s311_driver = { + .driver = { + .name = ADJD_S311_DRV_NAME, + }, + .probe = adjd_s311_probe, + .remove = adjd_s311_remove, + .id_table = adjd_s311_id, +}; +module_i2c_driver(adjd_s311_driver); + +MODULE_AUTHOR("Peter Meerwald "); +MODULE_DESCRIPTION("ADJD-S311 color sensor"); +MODULE_LICENSE("GPL");