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/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/i2c.h> 20 #include <linux/slab.h> 21 #include <linux/delay.h> 22 #include <linux/bitmap.h> 23 #include <linux/err.h> 24 #include <linux/irq.h> 25 26 #include <linux/iio/iio.h> 27 #include <linux/iio/sysfs.h> 28 #include <linux/iio/trigger_consumer.h> 29 #include <linux/iio/buffer.h> 30 #include <linux/iio/triggered_buffer.h> 31 32 #define ADJD_S311_DRV_NAME "adjd_s311" 33 34 #define ADJD_S311_CTRL 0x00 35 #define ADJD_S311_CONFIG 0x01 36 #define ADJD_S311_CAP_RED 0x06 37 #define ADJD_S311_CAP_GREEN 0x07 38 #define ADJD_S311_CAP_BLUE 0x08 39 #define ADJD_S311_CAP_CLEAR 0x09 40 #define ADJD_S311_INT_RED 0x0a 41 #define ADJD_S311_INT_GREEN 0x0c 42 #define ADJD_S311_INT_BLUE 0x0e 43 #define ADJD_S311_INT_CLEAR 0x10 44 #define ADJD_S311_DATA_RED 0x40 45 #define ADJD_S311_DATA_GREEN 0x42 46 #define ADJD_S311_DATA_BLUE 0x44 47 #define ADJD_S311_DATA_CLEAR 0x46 48 #define ADJD_S311_OFFSET_RED 0x48 49 #define ADJD_S311_OFFSET_GREEN 0x49 50 #define ADJD_S311_OFFSET_BLUE 0x4a 51 #define ADJD_S311_OFFSET_CLEAR 0x4b 52 53 #define ADJD_S311_CTRL_GOFS 0x02 54 #define ADJD_S311_CTRL_GSSR 0x01 55 #define ADJD_S311_CAP_MASK 0x0f 56 #define ADJD_S311_INT_MASK 0x0fff 57 #define ADJD_S311_DATA_MASK 0x03ff 58 59 struct adjd_s311_data { 60 struct i2c_client *client; 61 u16 *buffer; 62 }; 63 64 enum adjd_s311_channel_idx { 65 IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR 66 }; 67 68 #define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2) 69 #define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2) 70 #define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan)) 71 72 static int adjd_s311_req_data(struct iio_dev *indio_dev) 73 { 74 struct adjd_s311_data *data = iio_priv(indio_dev); 75 int tries = 10; 76 77 int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL, 78 ADJD_S311_CTRL_GSSR); 79 if (ret < 0) 80 return ret; 81 82 while (tries--) { 83 ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL); 84 if (ret < 0) 85 return ret; 86 if (!(ret & ADJD_S311_CTRL_GSSR)) 87 break; 88 msleep(20); 89 } 90 91 if (tries < 0) { 92 dev_err(&data->client->dev, 93 "adjd_s311_req_data() failed, data not ready\n"); 94 return -EIO; 95 } 96 97 return 0; 98 } 99 100 static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val) 101 { 102 struct adjd_s311_data *data = iio_priv(indio_dev); 103 104 int ret = adjd_s311_req_data(indio_dev); 105 if (ret < 0) 106 return ret; 107 108 ret = i2c_smbus_read_word_data(data->client, reg); 109 if (ret < 0) 110 return ret; 111 112 *val = ret & ADJD_S311_DATA_MASK; 113 114 return 0; 115 } 116 117 static irqreturn_t adjd_s311_trigger_handler(int irq, void *p) 118 { 119 struct iio_poll_func *pf = p; 120 struct iio_dev *indio_dev = pf->indio_dev; 121 struct adjd_s311_data *data = iio_priv(indio_dev); 122 s64 time_ns = iio_get_time_ns(); 123 int len = 0; 124 int i, j = 0; 125 126 int ret = adjd_s311_req_data(indio_dev); 127 if (ret < 0) 128 goto done; 129 130 for_each_set_bit(i, indio_dev->active_scan_mask, 131 indio_dev->masklength) { 132 ret = i2c_smbus_read_word_data(data->client, 133 ADJD_S311_DATA_REG(i)); 134 if (ret < 0) 135 goto done; 136 137 data->buffer[j++] = ret & ADJD_S311_DATA_MASK; 138 len += 2; 139 } 140 141 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, time_ns); 142 143 done: 144 iio_trigger_notify_done(indio_dev->trig); 145 146 return IRQ_HANDLED; 147 } 148 149 #define ADJD_S311_CHANNEL(_color, _scan_idx) { \ 150 .type = IIO_INTENSITY, \ 151 .modified = 1, \ 152 .address = (IDX_##_color), \ 153 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 154 BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \ 155 BIT(IIO_CHAN_INFO_INT_TIME), \ 156 .channel2 = (IIO_MOD_LIGHT_##_color), \ 157 .scan_index = (_scan_idx), \ 158 .scan_type = IIO_ST('u', 10, 16, 0), \ 159 } 160 161 static const struct iio_chan_spec adjd_s311_channels[] = { 162 ADJD_S311_CHANNEL(RED, 0), 163 ADJD_S311_CHANNEL(GREEN, 1), 164 ADJD_S311_CHANNEL(BLUE, 2), 165 ADJD_S311_CHANNEL(CLEAR, 3), 166 IIO_CHAN_SOFT_TIMESTAMP(4), 167 }; 168 169 static int adjd_s311_read_raw(struct iio_dev *indio_dev, 170 struct iio_chan_spec const *chan, 171 int *val, int *val2, long mask) 172 { 173 struct adjd_s311_data *data = iio_priv(indio_dev); 174 int ret; 175 176 switch (mask) { 177 case IIO_CHAN_INFO_RAW: 178 ret = adjd_s311_read_data(indio_dev, 179 ADJD_S311_DATA_REG(chan->address), val); 180 if (ret < 0) 181 return ret; 182 return IIO_VAL_INT; 183 case IIO_CHAN_INFO_HARDWAREGAIN: 184 ret = i2c_smbus_read_byte_data(data->client, 185 ADJD_S311_CAP_REG(chan->address)); 186 if (ret < 0) 187 return ret; 188 *val = ret & ADJD_S311_CAP_MASK; 189 return IIO_VAL_INT; 190 case IIO_CHAN_INFO_INT_TIME: 191 ret = i2c_smbus_read_word_data(data->client, 192 ADJD_S311_INT_REG(chan->address)); 193 if (ret < 0) 194 return ret; 195 *val = 0; 196 /* 197 * not documented, based on measurement: 198 * 4095 LSBs correspond to roughly 4 ms 199 */ 200 *val2 = ret & ADJD_S311_INT_MASK; 201 return IIO_VAL_INT_PLUS_MICRO; 202 } 203 return -EINVAL; 204 } 205 206 static int adjd_s311_write_raw(struct iio_dev *indio_dev, 207 struct iio_chan_spec const *chan, 208 int val, int val2, long mask) 209 { 210 struct adjd_s311_data *data = iio_priv(indio_dev); 211 212 switch (mask) { 213 case IIO_CHAN_INFO_HARDWAREGAIN: 214 if (val < 0 || val > ADJD_S311_CAP_MASK) 215 return -EINVAL; 216 217 return i2c_smbus_write_byte_data(data->client, 218 ADJD_S311_CAP_REG(chan->address), val); 219 case IIO_CHAN_INFO_INT_TIME: 220 if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK) 221 return -EINVAL; 222 223 return i2c_smbus_write_word_data(data->client, 224 ADJD_S311_INT_REG(chan->address), val2); 225 } 226 return -EINVAL; 227 } 228 229 static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev, 230 const unsigned long *scan_mask) 231 { 232 struct adjd_s311_data *data = iio_priv(indio_dev); 233 234 kfree(data->buffer); 235 data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 236 if (data->buffer == NULL) 237 return -ENOMEM; 238 239 return 0; 240 } 241 242 static const struct iio_info adjd_s311_info = { 243 .read_raw = adjd_s311_read_raw, 244 .write_raw = adjd_s311_write_raw, 245 .update_scan_mode = adjd_s311_update_scan_mode, 246 .driver_module = THIS_MODULE, 247 }; 248 249 static int adjd_s311_probe(struct i2c_client *client, 250 const struct i2c_device_id *id) 251 { 252 struct adjd_s311_data *data; 253 struct iio_dev *indio_dev; 254 int err; 255 256 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 257 if (indio_dev == NULL) 258 return -ENOMEM; 259 260 data = iio_priv(indio_dev); 261 i2c_set_clientdata(client, indio_dev); 262 data->client = client; 263 264 indio_dev->dev.parent = &client->dev; 265 indio_dev->info = &adjd_s311_info; 266 indio_dev->name = ADJD_S311_DRV_NAME; 267 indio_dev->channels = adjd_s311_channels; 268 indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels); 269 indio_dev->modes = INDIO_DIRECT_MODE; 270 271 err = iio_triggered_buffer_setup(indio_dev, NULL, 272 adjd_s311_trigger_handler, NULL); 273 if (err < 0) 274 return err; 275 276 err = iio_device_register(indio_dev); 277 if (err) 278 goto exit_unreg_buffer; 279 280 dev_info(&client->dev, "ADJD-S311 color sensor registered\n"); 281 282 return 0; 283 284 exit_unreg_buffer: 285 iio_triggered_buffer_cleanup(indio_dev); 286 return err; 287 } 288 289 static int adjd_s311_remove(struct i2c_client *client) 290 { 291 struct iio_dev *indio_dev = i2c_get_clientdata(client); 292 struct adjd_s311_data *data = iio_priv(indio_dev); 293 294 iio_device_unregister(indio_dev); 295 iio_triggered_buffer_cleanup(indio_dev); 296 kfree(data->buffer); 297 298 return 0; 299 } 300 301 static const struct i2c_device_id adjd_s311_id[] = { 302 { "adjd_s311", 0 }, 303 { } 304 }; 305 MODULE_DEVICE_TABLE(i2c, adjd_s311_id); 306 307 static struct i2c_driver adjd_s311_driver = { 308 .driver = { 309 .name = ADJD_S311_DRV_NAME, 310 }, 311 .probe = adjd_s311_probe, 312 .remove = adjd_s311_remove, 313 .id_table = adjd_s311_id, 314 }; 315 module_i2c_driver(adjd_s311_driver); 316 317 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 318 MODULE_DESCRIPTION("ADJD-S311 color sensor"); 319 MODULE_LICENSE("GPL"); 320