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