drivers/iio/light/isl29125.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * isl29125.c - Support for Intersil ISL29125 RGB light sensor
   4  *
   5  * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
   6  *
   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
  44 #define ISL29125_SENSING_RANGE_0 5722   /* 375 lux full range */
  45 #define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */
  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         u8 conf1;
  54         /* Ensure timestamp is naturally aligned */
  55         struct {
  56                 u16 chans[3];
  57                 s64 timestamp __aligned(8);
  58         } scan;
  59 };
  60
  61 #define ISL29125_CHANNEL(_color, _si) { \
  62         .type = IIO_INTENSITY, \
  63         .modified = 1, \
  64         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
  65         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
  66         .channel2 = IIO_MOD_LIGHT_##_color, \
  67         .scan_index = _si, \
  68         .scan_type = { \
  69                 .sign = 'u', \
  70                 .realbits = 16, \
  71                 .storagebits = 16, \
  72                 .endianness = IIO_CPU, \
  73         }, \
  74 }
  75
  76 static const struct iio_chan_spec isl29125_channels[] = {
  77         ISL29125_CHANNEL(GREEN, 0),
  78         ISL29125_CHANNEL(RED, 1),
  79         ISL29125_CHANNEL(BLUE, 2),
  80         IIO_CHAN_SOFT_TIMESTAMP(3),
  81 };
  82
  83 static const struct {
  84         u8 mode, data;
  85 } isl29125_regs[] = {
  86         {ISL29125_MODE_G, ISL29125_GREEN_DATA},
  87         {ISL29125_MODE_R, ISL29125_RED_DATA},
  88         {ISL29125_MODE_B, ISL29125_BLUE_DATA},
  89 };
  90
  91 static int isl29125_read_data(struct isl29125_data *data, int si)
  92 {
  93         int tries = 5;
  94         int ret;
  95
  96         ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
  97                 data->conf1 | isl29125_regs[si].mode);
  98         if (ret < 0)
  99                 return ret;
 100
 101         msleep(101);
 102
 103         while (tries--) {
 104                 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
 105                 if (ret < 0)
 106                         goto fail;
 107                 if (ret & ISL29125_STATUS_CONV)
 108                         break;
 109                 msleep(20);
 110         }
 111
 112         if (tries < 0) {
 113                 dev_err(&data->client->dev, "data not ready\n");
 114                 ret = -EIO;
 115                 goto fail;
 116         }
 117
 118         ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
 119
 120 fail:
 121         i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
 122         return ret;
 123 }
 124
 125 static int isl29125_read_raw(struct iio_dev *indio_dev,
 126                            struct iio_chan_spec const *chan,
 127                            int *val, int *val2, long mask)
 128 {
 129         struct isl29125_data *data = iio_priv(indio_dev);
 130         int ret;
 131
 132         switch (mask) {
 133         case IIO_CHAN_INFO_RAW:
 134                 ret = iio_device_claim_direct_mode(indio_dev);
 135                 if (ret)
 136                         return ret;
 137                 ret = isl29125_read_data(data, chan->scan_index);
 138                 iio_device_release_direct_mode(indio_dev);
 139                 if (ret < 0)
 140                         return ret;
 141                 *val = ret;
 142                 return IIO_VAL_INT;
 143         case IIO_CHAN_INFO_SCALE:
 144                 *val = 0;
 145                 if (data->conf1 & ISL29125_MODE_RANGE)
 146                         *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/
 147                 else
 148                         *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/
 149                 return IIO_VAL_INT_PLUS_MICRO;
 150         }
 151         return -EINVAL;
 152 }
 153
 154 static int isl29125_write_raw(struct iio_dev *indio_dev,
 155                                struct iio_chan_spec const *chan,
 156                                int val, int val2, long mask)
 157 {
 158         struct isl29125_data *data = iio_priv(indio_dev);
 159
 160         switch (mask) {
 161         case IIO_CHAN_INFO_SCALE:
 162                 if (val != 0)
 163                         return -EINVAL;
 164                 if (val2 == ISL29125_SENSING_RANGE_1)
 165                         data->conf1 |= ISL29125_MODE_RANGE;
 166                 else if (val2 == ISL29125_SENSING_RANGE_0)
 167                         data->conf1 &= ~ISL29125_MODE_RANGE;
 168                 else
 169                         return -EINVAL;
 170                 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 171                         data->conf1);
 172         default:
 173                 return -EINVAL;
 174         }
 175 }
 176
 177 static irqreturn_t isl29125_trigger_handler(int irq, void *p)
 178 {
 179         struct iio_poll_func *pf = p;
 180         struct iio_dev *indio_dev = pf->indio_dev;
 181         struct isl29125_data *data = iio_priv(indio_dev);
 182         int i, j = 0;
 183
 184         iio_for_each_active_channel(indio_dev, i) {
 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->scan.chans[j++] = ret;
 191         }
 192
 193         iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
 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 };
 218
 219 static int isl29125_buffer_postenable(struct iio_dev *indio_dev)
 220 {
 221         struct isl29125_data *data = iio_priv(indio_dev);
 222
 223         data->conf1 |= ISL29125_MODE_RGB;
 224         return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 225                 data->conf1);
 226 }
 227
 228 static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
 229 {
 230         struct isl29125_data *data = iio_priv(indio_dev);
 231
 232         data->conf1 &= ~ISL29125_MODE_MASK;
 233         data->conf1 |= ISL29125_MODE_PD;
 234         return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 235                 data->conf1);
 236 }
 237
 238 static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
 239         .postenable = isl29125_buffer_postenable,
 240         .predisable = isl29125_buffer_predisable,
 241 };
 242
 243 static int isl29125_probe(struct i2c_client *client)
 244 {
 245         struct isl29125_data *data;
 246         struct iio_dev *indio_dev;
 247         int ret;
 248
 249         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 250         if (indio_dev == NULL)
 251                 return -ENOMEM;
 252
 253         data = iio_priv(indio_dev);
 254         i2c_set_clientdata(client, indio_dev);
 255         data->client = client;
 256
 257         indio_dev->info = &isl29125_info;
 258         indio_dev->name = ISL29125_DRV_NAME;
 259         indio_dev->channels = isl29125_channels;
 260         indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);
 261         indio_dev->modes = INDIO_DIRECT_MODE;
 262
 263         ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
 264         if (ret < 0)
 265                 return ret;
 266         if (ret != ISL29125_ID)
 267                 return -ENODEV;
 268
 269         data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
 270         ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 271                 data->conf1);
 272         if (ret < 0)
 273                 return ret;
 274
 275         ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
 276         if (ret < 0)
 277                 return ret;
 278
 279         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 280                 isl29125_trigger_handler, &isl29125_buffer_setup_ops);
 281         if (ret < 0)
 282                 return ret;
 283
 284         ret = iio_device_register(indio_dev);
 285         if (ret < 0)
 286                 goto buffer_cleanup;
 287
 288         return 0;
 289
 290 buffer_cleanup:
 291         iio_triggered_buffer_cleanup(indio_dev);
 292         return ret;
 293 }
 294
 295 static int isl29125_powerdown(struct isl29125_data *data)
 296 {
 297         return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 298                 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);
 299 }
 300
 301 static void isl29125_remove(struct i2c_client *client)
 302 {
 303         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 304
 305         iio_device_unregister(indio_dev);
 306         iio_triggered_buffer_cleanup(indio_dev);
 307         isl29125_powerdown(iio_priv(indio_dev));
 308 }
 309
 310 static int isl29125_suspend(struct device *dev)
 311 {
 312         struct isl29125_data *data = iio_priv(i2c_get_clientdata(
 313                 to_i2c_client(dev)));
 314         return isl29125_powerdown(data);
 315 }
 316
 317 static int isl29125_resume(struct device *dev)
 318 {
 319         struct isl29125_data *data = iio_priv(i2c_get_clientdata(
 320                 to_i2c_client(dev)));
 321         return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
 322                 data->conf1);
 323 }
 324
 325 static DEFINE_SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend,
 326                                 isl29125_resume);
 327
 328 static const struct i2c_device_id isl29125_id[] = {
 329         { "isl29125" },
 330         { }
 331 };
 332 MODULE_DEVICE_TABLE(i2c, isl29125_id);
 333
 334 static struct i2c_driver isl29125_driver = {
 335         .driver = {
 336                 .name   = ISL29125_DRV_NAME,
 337                 .pm     = pm_sleep_ptr(&isl29125_pm_ops),
 338         },
 339         .probe          = isl29125_probe,
 340         .remove         = isl29125_remove,
 341         .id_table       = isl29125_id,
 342 };
 343 module_i2c_driver(isl29125_driver);
 344
 345 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 346 MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
 347 MODULE_LICENSE("GPL");