1 /* 2 * isl29125.c - Support for Intersil ISL29125 RGB light sensor 3 * 4 * Copyright (c) 2014 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 * RGB light sensor with 16-bit channels for red, green, blue); 11 * 7-bit I2C slave address 0x44 12 * 13 * TODO: interrupt support, IR compensation, thresholds, 12bit 14 */ 15 16 #include <linux/module.h> 17 #include <linux/i2c.h> 18 #include <linux/delay.h> 19 #include <linux/pm.h> 20 21 #include <linux/iio/iio.h> 22 #include <linux/iio/sysfs.h> 23 #include <linux/iio/trigger_consumer.h> 24 #include <linux/iio/buffer.h> 25 #include <linux/iio/triggered_buffer.h> 26 27 #define ISL29125_DRV_NAME "isl29125" 28 29 #define ISL29125_DEVICE_ID 0x00 30 #define ISL29125_CONF1 0x01 31 #define ISL29125_CONF2 0x02 32 #define ISL29125_CONF3 0x03 33 #define ISL29125_STATUS 0x08 34 #define ISL29125_GREEN_DATA 0x09 35 #define ISL29125_RED_DATA 0x0b 36 #define ISL29125_BLUE_DATA 0x0d 37 38 #define ISL29125_ID 0x7d 39 40 #define ISL29125_MODE_MASK GENMASK(2, 0) 41 #define ISL29125_MODE_PD 0x0 42 #define ISL29125_MODE_G 0x1 43 #define ISL29125_MODE_R 0x2 44 #define ISL29125_MODE_B 0x3 45 #define ISL29125_MODE_RGB 0x5 46 47 #define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */ 48 #define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */ 49 50 #define ISL29125_MODE_RANGE BIT(3) 51 52 #define ISL29125_STATUS_CONV BIT(1) 53 54 struct isl29125_data { 55 struct i2c_client *client; 56 u8 conf1; 57 u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */ 58 }; 59 60 #define ISL29125_CHANNEL(_color, _si) { \ 61 .type = IIO_INTENSITY, \ 62 .modified = 1, \ 63 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 64 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 65 .channel2 = IIO_MOD_LIGHT_##_color, \ 66 .scan_index = _si, \ 67 .scan_type = { \ 68 .sign = 'u', \ 69 .realbits = 16, \ 70 .storagebits = 16, \ 71 .endianness = IIO_CPU, \ 72 }, \ 73 } 74 75 static const struct iio_chan_spec isl29125_channels[] = { 76 ISL29125_CHANNEL(GREEN, 0), 77 ISL29125_CHANNEL(RED, 1), 78 ISL29125_CHANNEL(BLUE, 2), 79 IIO_CHAN_SOFT_TIMESTAMP(3), 80 }; 81 82 static const struct { 83 u8 mode, data; 84 } isl29125_regs[] = { 85 {ISL29125_MODE_G, ISL29125_GREEN_DATA}, 86 {ISL29125_MODE_R, ISL29125_RED_DATA}, 87 {ISL29125_MODE_B, ISL29125_BLUE_DATA}, 88 }; 89 90 static int isl29125_read_data(struct isl29125_data *data, int si) 91 { 92 int tries = 5; 93 int ret; 94 95 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 96 data->conf1 | isl29125_regs[si].mode); 97 if (ret < 0) 98 return ret; 99 100 msleep(101); 101 102 while (tries--) { 103 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS); 104 if (ret < 0) 105 goto fail; 106 if (ret & ISL29125_STATUS_CONV) 107 break; 108 msleep(20); 109 } 110 111 if (tries < 0) { 112 dev_err(&data->client->dev, "data not ready\n"); 113 ret = -EIO; 114 goto fail; 115 } 116 117 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data); 118 119 fail: 120 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1); 121 return ret; 122 } 123 124 static int isl29125_read_raw(struct iio_dev *indio_dev, 125 struct iio_chan_spec const *chan, 126 int *val, int *val2, long mask) 127 { 128 struct isl29125_data *data = iio_priv(indio_dev); 129 int ret; 130 131 switch (mask) { 132 case IIO_CHAN_INFO_RAW: 133 ret = iio_device_claim_direct_mode(indio_dev); 134 if (ret) 135 return ret; 136 ret = isl29125_read_data(data, chan->scan_index); 137 iio_device_release_direct_mode(indio_dev); 138 if (ret < 0) 139 return ret; 140 *val = ret; 141 return IIO_VAL_INT; 142 case IIO_CHAN_INFO_SCALE: 143 *val = 0; 144 if (data->conf1 & ISL29125_MODE_RANGE) 145 *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/ 146 else 147 *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/ 148 return IIO_VAL_INT_PLUS_MICRO; 149 } 150 return -EINVAL; 151 } 152 153 static int isl29125_write_raw(struct iio_dev *indio_dev, 154 struct iio_chan_spec const *chan, 155 int val, int val2, long mask) 156 { 157 struct isl29125_data *data = iio_priv(indio_dev); 158 159 switch (mask) { 160 case IIO_CHAN_INFO_SCALE: 161 if (val != 0) 162 return -EINVAL; 163 if (val2 == ISL29125_SENSING_RANGE_1) 164 data->conf1 |= ISL29125_MODE_RANGE; 165 else if (val2 == ISL29125_SENSING_RANGE_0) 166 data->conf1 &= ~ISL29125_MODE_RANGE; 167 else 168 return -EINVAL; 169 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 170 data->conf1); 171 default: 172 return -EINVAL; 173 } 174 } 175 176 static irqreturn_t isl29125_trigger_handler(int irq, void *p) 177 { 178 struct iio_poll_func *pf = p; 179 struct iio_dev *indio_dev = pf->indio_dev; 180 struct isl29125_data *data = iio_priv(indio_dev); 181 int i, j = 0; 182 183 for_each_set_bit(i, indio_dev->active_scan_mask, 184 indio_dev->masklength) { 185 int ret = i2c_smbus_read_word_data(data->client, 186 isl29125_regs[i].data); 187 if (ret < 0) 188 goto done; 189 190 data->buffer[j++] = ret; 191 } 192 193 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, 194 iio_get_time_ns(indio_dev)); 195 196 done: 197 iio_trigger_notify_done(indio_dev->trig); 198 199 return IRQ_HANDLED; 200 } 201 202 static IIO_CONST_ATTR(scale_available, "0.005722 0.152590"); 203 204 static struct attribute *isl29125_attributes[] = { 205 &iio_const_attr_scale_available.dev_attr.attr, 206 NULL 207 }; 208 209 static const struct attribute_group isl29125_attribute_group = { 210 .attrs = isl29125_attributes, 211 }; 212 213 static const struct iio_info isl29125_info = { 214 .read_raw = isl29125_read_raw, 215 .write_raw = isl29125_write_raw, 216 .attrs = &isl29125_attribute_group, 217 .driver_module = THIS_MODULE, 218 }; 219 220 static int isl29125_buffer_preenable(struct iio_dev *indio_dev) 221 { 222 struct isl29125_data *data = iio_priv(indio_dev); 223 224 data->conf1 |= ISL29125_MODE_RGB; 225 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 226 data->conf1); 227 } 228 229 static int isl29125_buffer_predisable(struct iio_dev *indio_dev) 230 { 231 struct isl29125_data *data = iio_priv(indio_dev); 232 int ret; 233 234 ret = iio_triggered_buffer_predisable(indio_dev); 235 if (ret < 0) 236 return ret; 237 238 data->conf1 &= ~ISL29125_MODE_MASK; 239 data->conf1 |= ISL29125_MODE_PD; 240 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 241 data->conf1); 242 } 243 244 static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = { 245 .preenable = isl29125_buffer_preenable, 246 .postenable = &iio_triggered_buffer_postenable, 247 .predisable = isl29125_buffer_predisable, 248 }; 249 250 static int isl29125_probe(struct i2c_client *client, 251 const struct i2c_device_id *id) 252 { 253 struct isl29125_data *data; 254 struct iio_dev *indio_dev; 255 int ret; 256 257 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 258 if (indio_dev == NULL) 259 return -ENOMEM; 260 261 data = iio_priv(indio_dev); 262 i2c_set_clientdata(client, indio_dev); 263 data->client = client; 264 265 indio_dev->dev.parent = &client->dev; 266 indio_dev->info = &isl29125_info; 267 indio_dev->name = ISL29125_DRV_NAME; 268 indio_dev->channels = isl29125_channels; 269 indio_dev->num_channels = ARRAY_SIZE(isl29125_channels); 270 indio_dev->modes = INDIO_DIRECT_MODE; 271 272 ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID); 273 if (ret < 0) 274 return ret; 275 if (ret != ISL29125_ID) 276 return -ENODEV; 277 278 data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE; 279 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 280 data->conf1); 281 if (ret < 0) 282 return ret; 283 284 ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0); 285 if (ret < 0) 286 return ret; 287 288 ret = iio_triggered_buffer_setup(indio_dev, NULL, 289 isl29125_trigger_handler, &isl29125_buffer_setup_ops); 290 if (ret < 0) 291 return ret; 292 293 ret = iio_device_register(indio_dev); 294 if (ret < 0) 295 goto buffer_cleanup; 296 297 return 0; 298 299 buffer_cleanup: 300 iio_triggered_buffer_cleanup(indio_dev); 301 return ret; 302 } 303 304 static int isl29125_powerdown(struct isl29125_data *data) 305 { 306 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 307 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD); 308 } 309 310 static int isl29125_remove(struct i2c_client *client) 311 { 312 struct iio_dev *indio_dev = i2c_get_clientdata(client); 313 314 iio_device_unregister(indio_dev); 315 iio_triggered_buffer_cleanup(indio_dev); 316 isl29125_powerdown(iio_priv(indio_dev)); 317 318 return 0; 319 } 320 321 #ifdef CONFIG_PM_SLEEP 322 static int isl29125_suspend(struct device *dev) 323 { 324 struct isl29125_data *data = iio_priv(i2c_get_clientdata( 325 to_i2c_client(dev))); 326 return isl29125_powerdown(data); 327 } 328 329 static int isl29125_resume(struct device *dev) 330 { 331 struct isl29125_data *data = iio_priv(i2c_get_clientdata( 332 to_i2c_client(dev))); 333 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, 334 data->conf1); 335 } 336 #endif 337 338 static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume); 339 340 static const struct i2c_device_id isl29125_id[] = { 341 { "isl29125", 0 }, 342 { } 343 }; 344 MODULE_DEVICE_TABLE(i2c, isl29125_id); 345 346 static struct i2c_driver isl29125_driver = { 347 .driver = { 348 .name = ISL29125_DRV_NAME, 349 .pm = &isl29125_pm_ops, 350 }, 351 .probe = isl29125_probe, 352 .remove = isl29125_remove, 353 .id_table = isl29125_id, 354 }; 355 module_i2c_driver(isl29125_driver); 356 357 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 358 MODULE_DESCRIPTION("ISL29125 RGB light sensor driver"); 359 MODULE_LICENSE("GPL"); 360