Thomas Gleixner | 36edc93 | 2019-05-29 16:57:44 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 2 | /* |
| 3 | * isl29125.c - Support for Intersil ISL29125 RGB light sensor |
| 4 | * |
| 5 | * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net> |
| 6 | * |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 7 | * RGB light sensor with 16-bit channels for red, green, blue); |
| 8 | * 7-bit I2C slave address 0x44 |
| 9 | * |
| 10 | * TODO: interrupt support, IR compensation, thresholds, 12bit |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/i2c.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/pm.h> |
| 17 | |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/iio/sysfs.h> |
| 20 | #include <linux/iio/trigger_consumer.h> |
| 21 | #include <linux/iio/buffer.h> |
| 22 | #include <linux/iio/triggered_buffer.h> |
| 23 | |
| 24 | #define ISL29125_DRV_NAME "isl29125" |
| 25 | |
| 26 | #define ISL29125_DEVICE_ID 0x00 |
| 27 | #define ISL29125_CONF1 0x01 |
| 28 | #define ISL29125_CONF2 0x02 |
| 29 | #define ISL29125_CONF3 0x03 |
| 30 | #define ISL29125_STATUS 0x08 |
| 31 | #define ISL29125_GREEN_DATA 0x09 |
| 32 | #define ISL29125_RED_DATA 0x0b |
| 33 | #define ISL29125_BLUE_DATA 0x0d |
| 34 | |
| 35 | #define ISL29125_ID 0x7d |
| 36 | |
| 37 | #define ISL29125_MODE_MASK GENMASK(2, 0) |
| 38 | #define ISL29125_MODE_PD 0x0 |
| 39 | #define ISL29125_MODE_G 0x1 |
| 40 | #define ISL29125_MODE_R 0x2 |
| 41 | #define ISL29125_MODE_B 0x3 |
| 42 | #define ISL29125_MODE_RGB 0x5 |
| 43 | |
Bijosh Thykkoottathil | 60b1add | 2016-06-27 15:37:41 +0000 | [diff] [blame] | 44 | #define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */ |
| 45 | #define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */ |
| 46 | |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 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; |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 53 | u8 conf1; |
| 54 | u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */ |
| 55 | }; |
| 56 | |
| 57 | #define ISL29125_CHANNEL(_color, _si) { \ |
| 58 | .type = IIO_INTENSITY, \ |
| 59 | .modified = 1, \ |
| 60 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 61 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| 62 | .channel2 = IIO_MOD_LIGHT_##_color, \ |
| 63 | .scan_index = _si, \ |
| 64 | .scan_type = { \ |
| 65 | .sign = 'u', \ |
| 66 | .realbits = 16, \ |
| 67 | .storagebits = 16, \ |
| 68 | .endianness = IIO_CPU, \ |
| 69 | }, \ |
| 70 | } |
| 71 | |
| 72 | static const struct iio_chan_spec isl29125_channels[] = { |
| 73 | ISL29125_CHANNEL(GREEN, 0), |
| 74 | ISL29125_CHANNEL(RED, 1), |
| 75 | ISL29125_CHANNEL(BLUE, 2), |
| 76 | IIO_CHAN_SOFT_TIMESTAMP(3), |
| 77 | }; |
| 78 | |
| 79 | static const struct { |
| 80 | u8 mode, data; |
| 81 | } isl29125_regs[] = { |
| 82 | {ISL29125_MODE_G, ISL29125_GREEN_DATA}, |
| 83 | {ISL29125_MODE_R, ISL29125_RED_DATA}, |
| 84 | {ISL29125_MODE_B, ISL29125_BLUE_DATA}, |
| 85 | }; |
| 86 | |
| 87 | static int isl29125_read_data(struct isl29125_data *data, int si) |
| 88 | { |
| 89 | int tries = 5; |
| 90 | int ret; |
| 91 | |
| 92 | ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| 93 | data->conf1 | isl29125_regs[si].mode); |
| 94 | if (ret < 0) |
| 95 | return ret; |
| 96 | |
| 97 | msleep(101); |
| 98 | |
| 99 | while (tries--) { |
| 100 | ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS); |
| 101 | if (ret < 0) |
| 102 | goto fail; |
| 103 | if (ret & ISL29125_STATUS_CONV) |
| 104 | break; |
| 105 | msleep(20); |
| 106 | } |
| 107 | |
| 108 | if (tries < 0) { |
| 109 | dev_err(&data->client->dev, "data not ready\n"); |
| 110 | ret = -EIO; |
| 111 | goto fail; |
| 112 | } |
| 113 | |
| 114 | ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data); |
| 115 | |
| 116 | fail: |
| 117 | i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1); |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | static int isl29125_read_raw(struct iio_dev *indio_dev, |
| 122 | struct iio_chan_spec const *chan, |
| 123 | int *val, int *val2, long mask) |
| 124 | { |
| 125 | struct isl29125_data *data = iio_priv(indio_dev); |
| 126 | int ret; |
| 127 | |
| 128 | switch (mask) { |
| 129 | case IIO_CHAN_INFO_RAW: |
Alison Schofield | ae148e5 | 2016-06-06 22:08:33 -0700 | [diff] [blame] | 130 | ret = iio_device_claim_direct_mode(indio_dev); |
| 131 | if (ret) |
| 132 | return ret; |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 133 | ret = isl29125_read_data(data, chan->scan_index); |
Alison Schofield | ae148e5 | 2016-06-06 22:08:33 -0700 | [diff] [blame] | 134 | iio_device_release_direct_mode(indio_dev); |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 135 | if (ret < 0) |
| 136 | return ret; |
| 137 | *val = ret; |
| 138 | return IIO_VAL_INT; |
| 139 | case IIO_CHAN_INFO_SCALE: |
| 140 | *val = 0; |
| 141 | if (data->conf1 & ISL29125_MODE_RANGE) |
Bijosh Thykkoottathil | 60b1add | 2016-06-27 15:37:41 +0000 | [diff] [blame] | 142 | *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/ |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 143 | else |
Bijosh Thykkoottathil | 60b1add | 2016-06-27 15:37:41 +0000 | [diff] [blame] | 144 | *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/ |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 145 | return IIO_VAL_INT_PLUS_MICRO; |
| 146 | } |
| 147 | return -EINVAL; |
| 148 | } |
| 149 | |
| 150 | static int isl29125_write_raw(struct iio_dev *indio_dev, |
| 151 | struct iio_chan_spec const *chan, |
| 152 | int val, int val2, long mask) |
| 153 | { |
| 154 | struct isl29125_data *data = iio_priv(indio_dev); |
| 155 | |
| 156 | switch (mask) { |
| 157 | case IIO_CHAN_INFO_SCALE: |
| 158 | if (val != 0) |
| 159 | return -EINVAL; |
Bijosh Thykkoottathil | 60b1add | 2016-06-27 15:37:41 +0000 | [diff] [blame] | 160 | if (val2 == ISL29125_SENSING_RANGE_1) |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 161 | data->conf1 |= ISL29125_MODE_RANGE; |
Bijosh Thykkoottathil | 60b1add | 2016-06-27 15:37:41 +0000 | [diff] [blame] | 162 | else if (val2 == ISL29125_SENSING_RANGE_0) |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 163 | data->conf1 &= ~ISL29125_MODE_RANGE; |
| 164 | else |
| 165 | return -EINVAL; |
| 166 | return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| 167 | data->conf1); |
| 168 | default: |
| 169 | return -EINVAL; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | static irqreturn_t isl29125_trigger_handler(int irq, void *p) |
| 174 | { |
| 175 | struct iio_poll_func *pf = p; |
| 176 | struct iio_dev *indio_dev = pf->indio_dev; |
| 177 | struct isl29125_data *data = iio_priv(indio_dev); |
| 178 | int i, j = 0; |
| 179 | |
| 180 | for_each_set_bit(i, indio_dev->active_scan_mask, |
| 181 | indio_dev->masklength) { |
| 182 | int ret = i2c_smbus_read_word_data(data->client, |
| 183 | isl29125_regs[i].data); |
| 184 | if (ret < 0) |
| 185 | goto done; |
| 186 | |
| 187 | data->buffer[j++] = ret; |
| 188 | } |
| 189 | |
| 190 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
Gregor Boirie | bc2b7da | 2016-03-09 19:05:49 +0100 | [diff] [blame] | 191 | iio_get_time_ns(indio_dev)); |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 192 | |
| 193 | done: |
| 194 | iio_trigger_notify_done(indio_dev->trig); |
| 195 | |
| 196 | return IRQ_HANDLED; |
| 197 | } |
| 198 | |
Peter Meerwald | 2083351 | 2015-06-20 23:51:38 +0200 | [diff] [blame] | 199 | static IIO_CONST_ATTR(scale_available, "0.005722 0.152590"); |
| 200 | |
| 201 | static struct attribute *isl29125_attributes[] = { |
| 202 | &iio_const_attr_scale_available.dev_attr.attr, |
| 203 | NULL |
| 204 | }; |
| 205 | |
| 206 | static const struct attribute_group isl29125_attribute_group = { |
| 207 | .attrs = isl29125_attributes, |
| 208 | }; |
| 209 | |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 210 | static const struct iio_info isl29125_info = { |
| 211 | .read_raw = isl29125_read_raw, |
| 212 | .write_raw = isl29125_write_raw, |
Peter Meerwald | 2083351 | 2015-06-20 23:51:38 +0200 | [diff] [blame] | 213 | .attrs = &isl29125_attribute_group, |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 214 | }; |
| 215 | |
Alexandru Ardelean | 9b7a12c | 2020-03-04 10:24:25 +0200 | [diff] [blame] | 216 | static int isl29125_buffer_postenable(struct iio_dev *indio_dev) |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 217 | { |
| 218 | struct isl29125_data *data = iio_priv(indio_dev); |
| 219 | |
| 220 | data->conf1 |= ISL29125_MODE_RGB; |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 221 | return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 222 | data->conf1); |
| 223 | } |
| 224 | |
| 225 | static int isl29125_buffer_predisable(struct iio_dev *indio_dev) |
| 226 | { |
| 227 | struct isl29125_data *data = iio_priv(indio_dev); |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 228 | |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 229 | data->conf1 &= ~ISL29125_MODE_MASK; |
| 230 | data->conf1 |= ISL29125_MODE_PD; |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 231 | return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 232 | data->conf1); |
| 233 | } |
| 234 | |
| 235 | static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = { |
Alexandru Ardelean | 9b7a12c | 2020-03-04 10:24:25 +0200 | [diff] [blame] | 236 | .postenable = isl29125_buffer_postenable, |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 237 | .predisable = isl29125_buffer_predisable, |
| 238 | }; |
| 239 | |
| 240 | static int isl29125_probe(struct i2c_client *client, |
| 241 | const struct i2c_device_id *id) |
| 242 | { |
| 243 | struct isl29125_data *data; |
| 244 | struct iio_dev *indio_dev; |
| 245 | int ret; |
| 246 | |
| 247 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| 248 | if (indio_dev == NULL) |
| 249 | return -ENOMEM; |
| 250 | |
| 251 | data = iio_priv(indio_dev); |
| 252 | i2c_set_clientdata(client, indio_dev); |
| 253 | data->client = client; |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 254 | |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 255 | indio_dev->info = &isl29125_info; |
| 256 | indio_dev->name = ISL29125_DRV_NAME; |
| 257 | indio_dev->channels = isl29125_channels; |
| 258 | indio_dev->num_channels = ARRAY_SIZE(isl29125_channels); |
| 259 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 260 | |
| 261 | ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID); |
| 262 | if (ret < 0) |
| 263 | return ret; |
| 264 | if (ret != ISL29125_ID) |
| 265 | return -ENODEV; |
| 266 | |
| 267 | data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE; |
| 268 | ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| 269 | data->conf1); |
| 270 | if (ret < 0) |
| 271 | return ret; |
| 272 | |
| 273 | ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0); |
| 274 | if (ret < 0) |
| 275 | return ret; |
| 276 | |
| 277 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
| 278 | isl29125_trigger_handler, &isl29125_buffer_setup_ops); |
| 279 | if (ret < 0) |
| 280 | return ret; |
| 281 | |
| 282 | ret = iio_device_register(indio_dev); |
| 283 | if (ret < 0) |
| 284 | goto buffer_cleanup; |
| 285 | |
| 286 | return 0; |
| 287 | |
| 288 | buffer_cleanup: |
| 289 | iio_triggered_buffer_cleanup(indio_dev); |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | static int isl29125_powerdown(struct isl29125_data *data) |
| 294 | { |
| 295 | return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| 296 | (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD); |
| 297 | } |
| 298 | |
| 299 | static int isl29125_remove(struct i2c_client *client) |
| 300 | { |
| 301 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 302 | |
| 303 | iio_device_unregister(indio_dev); |
| 304 | iio_triggered_buffer_cleanup(indio_dev); |
| 305 | isl29125_powerdown(iio_priv(indio_dev)); |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | #ifdef CONFIG_PM_SLEEP |
| 311 | static int isl29125_suspend(struct device *dev) |
| 312 | { |
| 313 | struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
| 314 | to_i2c_client(dev))); |
| 315 | return isl29125_powerdown(data); |
| 316 | } |
| 317 | |
| 318 | static int isl29125_resume(struct device *dev) |
| 319 | { |
| 320 | struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
| 321 | to_i2c_client(dev))); |
| 322 | return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
| 323 | data->conf1); |
| 324 | } |
| 325 | #endif |
| 326 | |
| 327 | static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume); |
| 328 | |
| 329 | static const struct i2c_device_id isl29125_id[] = { |
| 330 | { "isl29125", 0 }, |
| 331 | { } |
| 332 | }; |
| 333 | MODULE_DEVICE_TABLE(i2c, isl29125_id); |
| 334 | |
| 335 | static struct i2c_driver isl29125_driver = { |
| 336 | .driver = { |
| 337 | .name = ISL29125_DRV_NAME, |
| 338 | .pm = &isl29125_pm_ops, |
Peter Meerwald | 6c25539 | 2014-05-07 13:38:00 +0100 | [diff] [blame] | 339 | }, |
| 340 | .probe = isl29125_probe, |
| 341 | .remove = isl29125_remove, |
| 342 | .id_table = isl29125_id, |
| 343 | }; |
| 344 | module_i2c_driver(isl29125_driver); |
| 345 | |
| 346 | MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); |
| 347 | MODULE_DESCRIPTION("ISL29125 RGB light sensor driver"); |
| 348 | MODULE_LICENSE("GPL"); |