1 /* 2 * adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor 3 * 4 * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net> 5 * 6 * This file is subject to the terms and conditions of version 2 of 7 * the GNU General Public License. See the file COPYING in the main 8 * directory of this archive for more details. 9 * 10 * driver for ADJD-S311-CR999 digital color sensor (10-bit channels for 11 * red, green, blue, clear); 7-bit I2C slave address 0x74 12 * 13 * limitations: no calibration, no offset mode, no sleep mode 14 */ 15 16 #include <linux/module.h> 17 #include <linux/interrupt.h> 18 #include <linux/i2c.h> 19 #include <linux/slab.h> 20 #include <linux/delay.h> 21 #include <linux/bitmap.h> 22 #include <linux/err.h> 23 #include <linux/irq.h> 24 25 #include <linux/iio/iio.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/trigger_consumer.h> 28 #include <linux/iio/buffer.h> 29 #include <linux/iio/triggered_buffer.h> 30 31 #define ADJD_S311_DRV_NAME "adjd_s311" 32 33 #define ADJD_S311_CTRL 0x00 34 #define ADJD_S311_CONFIG 0x01 35 #define ADJD_S311_CAP_RED 0x06 36 #define ADJD_S311_CAP_GREEN 0x07 37 #define ADJD_S311_CAP_BLUE 0x08 38 #define ADJD_S311_CAP_CLEAR 0x09 39 #define ADJD_S311_INT_RED 0x0a 40 #define ADJD_S311_INT_GREEN 0x0c 41 #define ADJD_S311_INT_BLUE 0x0e 42 #define ADJD_S311_INT_CLEAR 0x10 43 #define ADJD_S311_DATA_RED 0x40 44 #define ADJD_S311_DATA_GREEN 0x42 45 #define ADJD_S311_DATA_BLUE 0x44 46 #define ADJD_S311_DATA_CLEAR 0x46 47 #define ADJD_S311_OFFSET_RED 0x48 48 #define ADJD_S311_OFFSET_GREEN 0x49 49 #define ADJD_S311_OFFSET_BLUE 0x4a 50 #define ADJD_S311_OFFSET_CLEAR 0x4b 51 52 #define ADJD_S311_CTRL_GOFS 0x02 53 #define ADJD_S311_CTRL_GSSR 0x01 54 #define ADJD_S311_CAP_MASK 0x0f 55 #define ADJD_S311_INT_MASK 0x0fff 56 #define ADJD_S311_DATA_MASK 0x03ff 57 58 struct adjd_s311_data { 59 struct i2c_client *client; 60 u16 *buffer; 61 }; 62 63 enum adjd_s311_channel_idx { 64 IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR 65 }; 66 67 #define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2) 68 #define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2) 69 #define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan)) 70 71 static int adjd_s311_req_data(struct iio_dev *indio_dev) 72 { 73 struct adjd_s311_data *data = iio_priv(indio_dev); 74 int tries = 10; 75 76 int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL, 77 ADJD_S311_CTRL_GSSR); 78 if (ret < 0) 79 return ret; 80 81 while (tries--) { 82 ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL); 83 if (ret < 0) 84 return ret; 85 if (!(ret & ADJD_S311_CTRL_GSSR)) 86 break; 87 msleep(20); 88 } 89 90 if (tries < 0) { 91 dev_err(&data->client->dev, 92 "adjd_s311_req_data() failed, data not ready\n"); 93 return -EIO; 94 } 95 96 return 0; 97 } 98 99 static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val) 100 { 101 struct adjd_s311_data *data = iio_priv(indio_dev); 102 103 int ret = adjd_s311_req_data(indio_dev); 104 if (ret < 0) 105 return ret; 106 107 ret = i2c_smbus_read_word_data(data->client, reg); 108 if (ret < 0) 109 return ret; 110 111 *val = ret & ADJD_S311_DATA_MASK; 112 113 return 0; 114 } 115 116 static irqreturn_t adjd_s311_trigger_handler(int irq, void *p) 117 { 118 struct iio_poll_func *pf = p; 119 struct iio_dev *indio_dev = pf->indio_dev; 120 struct adjd_s311_data *data = iio_priv(indio_dev); 121 s64 time_ns = iio_get_time_ns(indio_dev); 122 int i, j = 0; 123 124 int ret = adjd_s311_req_data(indio_dev); 125 if (ret < 0) 126 goto done; 127 128 for_each_set_bit(i, indio_dev->active_scan_mask, 129 indio_dev->masklength) { 130 ret = i2c_smbus_read_word_data(data->client, 131 ADJD_S311_DATA_REG(i)); 132 if (ret < 0) 133 goto done; 134 135 data->buffer[j++] = ret & ADJD_S311_DATA_MASK; 136 } 137 138 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, time_ns); 139 140 done: 141 iio_trigger_notify_done(indio_dev->trig); 142 143 return IRQ_HANDLED; 144 } 145 146 #define ADJD_S311_CHANNEL(_color, _scan_idx) { \ 147 .type = IIO_INTENSITY, \ 148 .modified = 1, \ 149 .address = (IDX_##_color), \ 150 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 151 BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \ 152 BIT(IIO_CHAN_INFO_INT_TIME), \ 153 .channel2 = (IIO_MOD_LIGHT_##_color), \ 154 .scan_index = (_scan_idx), \ 155 .scan_type = { \ 156 .sign = 'u', \ 157 .realbits = 10, \ 158 .storagebits = 16, \ 159 .endianness = IIO_CPU, \ 160 }, \ 161 } 162 163 static const struct iio_chan_spec adjd_s311_channels[] = { 164 ADJD_S311_CHANNEL(RED, 0), 165 ADJD_S311_CHANNEL(GREEN, 1), 166 ADJD_S311_CHANNEL(BLUE, 2), 167 ADJD_S311_CHANNEL(CLEAR, 3), 168 IIO_CHAN_SOFT_TIMESTAMP(4), 169 }; 170 171 static int adjd_s311_read_raw(struct iio_dev *indio_dev, 172 struct iio_chan_spec const *chan, 173 int *val, int *val2, long mask) 174 { 175 struct adjd_s311_data *data = iio_priv(indio_dev); 176 int ret; 177 178 switch (mask) { 179 case IIO_CHAN_INFO_RAW: 180 ret = adjd_s311_read_data(indio_dev, 181 ADJD_S311_DATA_REG(chan->address), val); 182 if (ret < 0) 183 return ret; 184 return IIO_VAL_INT; 185 case IIO_CHAN_INFO_HARDWAREGAIN: 186 ret = i2c_smbus_read_byte_data(data->client, 187 ADJD_S311_CAP_REG(chan->address)); 188 if (ret < 0) 189 return ret; 190 *val = ret & ADJD_S311_CAP_MASK; 191 return IIO_VAL_INT; 192 case IIO_CHAN_INFO_INT_TIME: 193 ret = i2c_smbus_read_word_data(data->client, 194 ADJD_S311_INT_REG(chan->address)); 195 if (ret < 0) 196 return ret; 197 *val = 0; 198 /* 199 * not documented, based on measurement: 200 * 4095 LSBs correspond to roughly 4 ms 201 */ 202 *val2 = ret & ADJD_S311_INT_MASK; 203 return IIO_VAL_INT_PLUS_MICRO; 204 } 205 return -EINVAL; 206 } 207 208 static int adjd_s311_write_raw(struct iio_dev *indio_dev, 209 struct iio_chan_spec const *chan, 210 int val, int val2, long mask) 211 { 212 struct adjd_s311_data *data = iio_priv(indio_dev); 213 214 switch (mask) { 215 case IIO_CHAN_INFO_HARDWAREGAIN: 216 if (val < 0 || val > ADJD_S311_CAP_MASK) 217 return -EINVAL; 218 219 return i2c_smbus_write_byte_data(data->client, 220 ADJD_S311_CAP_REG(chan->address), val); 221 case IIO_CHAN_INFO_INT_TIME: 222 if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK) 223 return -EINVAL; 224 225 return i2c_smbus_write_word_data(data->client, 226 ADJD_S311_INT_REG(chan->address), val2); 227 } 228 return -EINVAL; 229 } 230 231 static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev, 232 const unsigned long *scan_mask) 233 { 234 struct adjd_s311_data *data = iio_priv(indio_dev); 235 236 kfree(data->buffer); 237 data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 238 if (data->buffer == NULL) 239 return -ENOMEM; 240 241 return 0; 242 } 243 244 static const struct iio_info adjd_s311_info = { 245 .read_raw = adjd_s311_read_raw, 246 .write_raw = adjd_s311_write_raw, 247 .update_scan_mode = adjd_s311_update_scan_mode, 248 .driver_module = THIS_MODULE, 249 }; 250 251 static int adjd_s311_probe(struct i2c_client *client, 252 const struct i2c_device_id *id) 253 { 254 struct adjd_s311_data *data; 255 struct iio_dev *indio_dev; 256 int err; 257 258 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 259 if (indio_dev == NULL) 260 return -ENOMEM; 261 262 data = iio_priv(indio_dev); 263 i2c_set_clientdata(client, indio_dev); 264 data->client = client; 265 266 indio_dev->dev.parent = &client->dev; 267 indio_dev->info = &adjd_s311_info; 268 indio_dev->name = ADJD_S311_DRV_NAME; 269 indio_dev->channels = adjd_s311_channels; 270 indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels); 271 indio_dev->modes = INDIO_DIRECT_MODE; 272 273 err = iio_triggered_buffer_setup(indio_dev, NULL, 274 adjd_s311_trigger_handler, NULL); 275 if (err < 0) 276 return err; 277 278 err = iio_device_register(indio_dev); 279 if (err) 280 goto exit_unreg_buffer; 281 282 dev_info(&client->dev, "ADJD-S311 color sensor registered\n"); 283 284 return 0; 285 286 exit_unreg_buffer: 287 iio_triggered_buffer_cleanup(indio_dev); 288 return err; 289 } 290 291 static int adjd_s311_remove(struct i2c_client *client) 292 { 293 struct iio_dev *indio_dev = i2c_get_clientdata(client); 294 struct adjd_s311_data *data = iio_priv(indio_dev); 295 296 iio_device_unregister(indio_dev); 297 iio_triggered_buffer_cleanup(indio_dev); 298 kfree(data->buffer); 299 300 return 0; 301 } 302 303 static const struct i2c_device_id adjd_s311_id[] = { 304 { "adjd_s311", 0 }, 305 { } 306 }; 307 MODULE_DEVICE_TABLE(i2c, adjd_s311_id); 308 309 static struct i2c_driver adjd_s311_driver = { 310 .driver = { 311 .name = ADJD_S311_DRV_NAME, 312 }, 313 .probe = adjd_s311_probe, 314 .remove = adjd_s311_remove, 315 .id_table = adjd_s311_id, 316 }; 317 module_i2c_driver(adjd_s311_driver); 318 319 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 320 MODULE_DESCRIPTION("ADJD-S311 color sensor"); 321 MODULE_LICENSE("GPL"); 322