Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 Prevas A/S |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/sysfs.h> |
| 13 | #include <linux/spi/spi.h> |
| 14 | #include <linux/regulator/consumer.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/of.h> |
| 18 | |
| 19 | #include <linux/iio/iio.h> |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 20 | #include <linux/iio/buffer.h> |
| 21 | #include <linux/iio/trigger_consumer.h> |
| 22 | #include <linux/iio/triggered_buffer.h> |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 23 | #include <linux/iio/sysfs.h> |
| 24 | |
| 25 | #define ADS8688_CMD_REG(x) (x << 8) |
| 26 | #define ADS8688_CMD_REG_NOOP 0x00 |
| 27 | #define ADS8688_CMD_REG_RST 0x85 |
| 28 | #define ADS8688_CMD_REG_MAN_CH(chan) (0xC0 | (4 * chan)) |
| 29 | #define ADS8688_CMD_DONT_CARE_BITS 16 |
| 30 | |
| 31 | #define ADS8688_PROG_REG(x) (x << 9) |
| 32 | #define ADS8688_PROG_REG_RANGE_CH(chan) (0x05 + chan) |
| 33 | #define ADS8688_PROG_WR_BIT BIT(8) |
| 34 | #define ADS8688_PROG_DONT_CARE_BITS 8 |
| 35 | |
| 36 | #define ADS8688_REG_PLUSMINUS25VREF 0 |
| 37 | #define ADS8688_REG_PLUSMINUS125VREF 1 |
| 38 | #define ADS8688_REG_PLUSMINUS0625VREF 2 |
| 39 | #define ADS8688_REG_PLUS25VREF 5 |
| 40 | #define ADS8688_REG_PLUS125VREF 6 |
| 41 | |
| 42 | #define ADS8688_VREF_MV 4096 |
| 43 | #define ADS8688_REALBITS 16 |
| 44 | |
| 45 | /* |
| 46 | * enum ads8688_range - ADS8688 reference voltage range |
| 47 | * @ADS8688_PLUSMINUS25VREF: Device is configured for input range ±2.5 * VREF |
| 48 | * @ADS8688_PLUSMINUS125VREF: Device is configured for input range ±1.25 * VREF |
| 49 | * @ADS8688_PLUSMINUS0625VREF: Device is configured for input range ±0.625 * VREF |
| 50 | * @ADS8688_PLUS25VREF: Device is configured for input range 0 - 2.5 * VREF |
| 51 | * @ADS8688_PLUS125VREF: Device is configured for input range 0 - 1.25 * VREF |
| 52 | */ |
| 53 | enum ads8688_range { |
| 54 | ADS8688_PLUSMINUS25VREF, |
| 55 | ADS8688_PLUSMINUS125VREF, |
| 56 | ADS8688_PLUSMINUS0625VREF, |
| 57 | ADS8688_PLUS25VREF, |
| 58 | ADS8688_PLUS125VREF, |
| 59 | }; |
| 60 | |
| 61 | struct ads8688_chip_info { |
| 62 | const struct iio_chan_spec *channels; |
| 63 | unsigned int num_channels; |
| 64 | }; |
| 65 | |
| 66 | struct ads8688_state { |
| 67 | struct mutex lock; |
| 68 | const struct ads8688_chip_info *chip_info; |
| 69 | struct spi_device *spi; |
| 70 | struct regulator *reg; |
| 71 | unsigned int vref_mv; |
| 72 | enum ads8688_range range[8]; |
| 73 | union { |
| 74 | __be32 d32; |
| 75 | u8 d8[4]; |
| 76 | } data[2] ____cacheline_aligned; |
| 77 | }; |
| 78 | |
| 79 | enum ads8688_id { |
| 80 | ID_ADS8684, |
| 81 | ID_ADS8688, |
| 82 | }; |
| 83 | |
| 84 | struct ads8688_ranges { |
| 85 | enum ads8688_range range; |
| 86 | unsigned int scale; |
| 87 | int offset; |
| 88 | u8 reg; |
| 89 | }; |
| 90 | |
| 91 | static const struct ads8688_ranges ads8688_range_def[5] = { |
| 92 | { |
| 93 | .range = ADS8688_PLUSMINUS25VREF, |
| 94 | .scale = 76295, |
| 95 | .offset = -(1 << (ADS8688_REALBITS - 1)), |
| 96 | .reg = ADS8688_REG_PLUSMINUS25VREF, |
| 97 | }, { |
| 98 | .range = ADS8688_PLUSMINUS125VREF, |
| 99 | .scale = 38148, |
| 100 | .offset = -(1 << (ADS8688_REALBITS - 1)), |
| 101 | .reg = ADS8688_REG_PLUSMINUS125VREF, |
| 102 | }, { |
| 103 | .range = ADS8688_PLUSMINUS0625VREF, |
| 104 | .scale = 19074, |
| 105 | .offset = -(1 << (ADS8688_REALBITS - 1)), |
| 106 | .reg = ADS8688_REG_PLUSMINUS0625VREF, |
| 107 | }, { |
| 108 | .range = ADS8688_PLUS25VREF, |
| 109 | .scale = 38148, |
| 110 | .offset = 0, |
| 111 | .reg = ADS8688_REG_PLUS25VREF, |
| 112 | }, { |
| 113 | .range = ADS8688_PLUS125VREF, |
| 114 | .scale = 19074, |
| 115 | .offset = 0, |
| 116 | .reg = ADS8688_REG_PLUS125VREF, |
| 117 | } |
| 118 | }; |
| 119 | |
| 120 | static ssize_t ads8688_show_scales(struct device *dev, |
| 121 | struct device_attribute *attr, char *buf) |
| 122 | { |
| 123 | struct ads8688_state *st = iio_priv(dev_to_iio_dev(dev)); |
| 124 | |
| 125 | return sprintf(buf, "0.%09u 0.%09u 0.%09u\n", |
| 126 | ads8688_range_def[0].scale * st->vref_mv, |
| 127 | ads8688_range_def[1].scale * st->vref_mv, |
| 128 | ads8688_range_def[2].scale * st->vref_mv); |
| 129 | } |
| 130 | |
| 131 | static ssize_t ads8688_show_offsets(struct device *dev, |
| 132 | struct device_attribute *attr, char *buf) |
| 133 | { |
| 134 | return sprintf(buf, "%d %d\n", ads8688_range_def[0].offset, |
| 135 | ads8688_range_def[3].offset); |
| 136 | } |
| 137 | |
| 138 | static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO, |
| 139 | ads8688_show_scales, NULL, 0); |
| 140 | static IIO_DEVICE_ATTR(in_voltage_offset_available, S_IRUGO, |
| 141 | ads8688_show_offsets, NULL, 0); |
| 142 | |
| 143 | static struct attribute *ads8688_attributes[] = { |
| 144 | &iio_dev_attr_in_voltage_scale_available.dev_attr.attr, |
| 145 | &iio_dev_attr_in_voltage_offset_available.dev_attr.attr, |
| 146 | NULL, |
| 147 | }; |
| 148 | |
| 149 | static const struct attribute_group ads8688_attribute_group = { |
| 150 | .attrs = ads8688_attributes, |
| 151 | }; |
| 152 | |
| 153 | #define ADS8688_CHAN(index) \ |
| 154 | { \ |
| 155 | .type = IIO_VOLTAGE, \ |
| 156 | .indexed = 1, \ |
| 157 | .channel = index, \ |
| 158 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \ |
| 159 | | BIT(IIO_CHAN_INFO_SCALE) \ |
| 160 | | BIT(IIO_CHAN_INFO_OFFSET), \ |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 161 | .scan_index = index, \ |
| 162 | .scan_type = { \ |
| 163 | .sign = 'u', \ |
| 164 | .realbits = 16, \ |
| 165 | .storagebits = 16, \ |
| 166 | .endianness = IIO_BE, \ |
| 167 | }, \ |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | static const struct iio_chan_spec ads8684_channels[] = { |
| 171 | ADS8688_CHAN(0), |
| 172 | ADS8688_CHAN(1), |
| 173 | ADS8688_CHAN(2), |
| 174 | ADS8688_CHAN(3), |
| 175 | }; |
| 176 | |
| 177 | static const struct iio_chan_spec ads8688_channels[] = { |
| 178 | ADS8688_CHAN(0), |
| 179 | ADS8688_CHAN(1), |
| 180 | ADS8688_CHAN(2), |
| 181 | ADS8688_CHAN(3), |
| 182 | ADS8688_CHAN(4), |
| 183 | ADS8688_CHAN(5), |
| 184 | ADS8688_CHAN(6), |
| 185 | ADS8688_CHAN(7), |
| 186 | }; |
| 187 | |
| 188 | static int ads8688_prog_write(struct iio_dev *indio_dev, unsigned int addr, |
| 189 | unsigned int val) |
| 190 | { |
| 191 | struct ads8688_state *st = iio_priv(indio_dev); |
| 192 | u32 tmp; |
| 193 | |
| 194 | tmp = ADS8688_PROG_REG(addr) | ADS8688_PROG_WR_BIT | val; |
| 195 | tmp <<= ADS8688_PROG_DONT_CARE_BITS; |
| 196 | st->data[0].d32 = cpu_to_be32(tmp); |
| 197 | |
| 198 | return spi_write(st->spi, &st->data[0].d8[1], 3); |
| 199 | } |
| 200 | |
| 201 | static int ads8688_reset(struct iio_dev *indio_dev) |
| 202 | { |
| 203 | struct ads8688_state *st = iio_priv(indio_dev); |
| 204 | u32 tmp; |
| 205 | |
| 206 | tmp = ADS8688_CMD_REG(ADS8688_CMD_REG_RST); |
| 207 | tmp <<= ADS8688_CMD_DONT_CARE_BITS; |
| 208 | st->data[0].d32 = cpu_to_be32(tmp); |
| 209 | |
| 210 | return spi_write(st->spi, &st->data[0].d8[0], 4); |
| 211 | } |
| 212 | |
| 213 | static int ads8688_read(struct iio_dev *indio_dev, unsigned int chan) |
| 214 | { |
| 215 | struct ads8688_state *st = iio_priv(indio_dev); |
| 216 | int ret; |
| 217 | u32 tmp; |
| 218 | struct spi_transfer t[] = { |
| 219 | { |
| 220 | .tx_buf = &st->data[0].d8[0], |
| 221 | .len = 4, |
| 222 | .cs_change = 1, |
| 223 | }, { |
| 224 | .tx_buf = &st->data[1].d8[0], |
| 225 | .rx_buf = &st->data[1].d8[0], |
| 226 | .len = 4, |
| 227 | }, |
| 228 | }; |
| 229 | |
| 230 | tmp = ADS8688_CMD_REG(ADS8688_CMD_REG_MAN_CH(chan)); |
| 231 | tmp <<= ADS8688_CMD_DONT_CARE_BITS; |
| 232 | st->data[0].d32 = cpu_to_be32(tmp); |
| 233 | |
| 234 | tmp = ADS8688_CMD_REG(ADS8688_CMD_REG_NOOP); |
| 235 | tmp <<= ADS8688_CMD_DONT_CARE_BITS; |
| 236 | st->data[1].d32 = cpu_to_be32(tmp); |
| 237 | |
| 238 | ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); |
| 239 | if (ret < 0) |
| 240 | return ret; |
| 241 | |
| 242 | return be32_to_cpu(st->data[1].d32) & 0xffff; |
| 243 | } |
| 244 | |
| 245 | static int ads8688_read_raw(struct iio_dev *indio_dev, |
| 246 | struct iio_chan_spec const *chan, |
| 247 | int *val, int *val2, long m) |
| 248 | { |
| 249 | int ret, offset; |
| 250 | unsigned long scale_mv; |
| 251 | |
| 252 | struct ads8688_state *st = iio_priv(indio_dev); |
| 253 | |
| 254 | mutex_lock(&st->lock); |
| 255 | switch (m) { |
| 256 | case IIO_CHAN_INFO_RAW: |
| 257 | ret = ads8688_read(indio_dev, chan->channel); |
| 258 | mutex_unlock(&st->lock); |
| 259 | if (ret < 0) |
| 260 | return ret; |
| 261 | *val = ret; |
| 262 | return IIO_VAL_INT; |
| 263 | case IIO_CHAN_INFO_SCALE: |
| 264 | scale_mv = st->vref_mv; |
| 265 | scale_mv *= ads8688_range_def[st->range[chan->channel]].scale; |
| 266 | *val = 0; |
| 267 | *val2 = scale_mv; |
| 268 | mutex_unlock(&st->lock); |
| 269 | return IIO_VAL_INT_PLUS_NANO; |
| 270 | case IIO_CHAN_INFO_OFFSET: |
| 271 | offset = ads8688_range_def[st->range[chan->channel]].offset; |
| 272 | *val = offset; |
| 273 | mutex_unlock(&st->lock); |
| 274 | return IIO_VAL_INT; |
| 275 | } |
| 276 | mutex_unlock(&st->lock); |
| 277 | |
| 278 | return -EINVAL; |
| 279 | } |
| 280 | |
| 281 | static int ads8688_write_reg_range(struct iio_dev *indio_dev, |
| 282 | struct iio_chan_spec const *chan, |
| 283 | enum ads8688_range range) |
| 284 | { |
| 285 | unsigned int tmp; |
| 286 | int ret; |
| 287 | |
| 288 | tmp = ADS8688_PROG_REG_RANGE_CH(chan->channel); |
| 289 | ret = ads8688_prog_write(indio_dev, tmp, range); |
| 290 | |
| 291 | return ret; |
| 292 | } |
| 293 | |
| 294 | static int ads8688_write_raw(struct iio_dev *indio_dev, |
| 295 | struct iio_chan_spec const *chan, |
| 296 | int val, int val2, long mask) |
| 297 | { |
| 298 | struct ads8688_state *st = iio_priv(indio_dev); |
| 299 | unsigned int scale = 0; |
| 300 | int ret = -EINVAL, i, offset = 0; |
| 301 | |
| 302 | mutex_lock(&st->lock); |
| 303 | switch (mask) { |
| 304 | case IIO_CHAN_INFO_SCALE: |
| 305 | /* If the offset is 0 the ±2.5 * VREF mode is not available */ |
| 306 | offset = ads8688_range_def[st->range[chan->channel]].offset; |
| 307 | if (offset == 0 && val2 == ads8688_range_def[0].scale * st->vref_mv) { |
| 308 | mutex_unlock(&st->lock); |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | |
| 312 | /* Lookup new mode */ |
| 313 | for (i = 0; i < ARRAY_SIZE(ads8688_range_def); i++) |
| 314 | if (val2 == ads8688_range_def[i].scale * st->vref_mv && |
| 315 | offset == ads8688_range_def[i].offset) { |
| 316 | ret = ads8688_write_reg_range(indio_dev, chan, |
| 317 | ads8688_range_def[i].reg); |
| 318 | break; |
| 319 | } |
| 320 | break; |
| 321 | case IIO_CHAN_INFO_OFFSET: |
| 322 | /* |
| 323 | * There are only two available offsets: |
| 324 | * 0 and -(1 << (ADS8688_REALBITS - 1)) |
| 325 | */ |
| 326 | if (!(ads8688_range_def[0].offset == val || |
| 327 | ads8688_range_def[3].offset == val)) { |
| 328 | mutex_unlock(&st->lock); |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * If the device are in ±2.5 * VREF mode, it's not allowed to |
| 334 | * switch to a mode where the offset is 0 |
| 335 | */ |
| 336 | if (val == 0 && |
| 337 | st->range[chan->channel] == ADS8688_PLUSMINUS25VREF) { |
| 338 | mutex_unlock(&st->lock); |
| 339 | return -EINVAL; |
| 340 | } |
| 341 | |
| 342 | scale = ads8688_range_def[st->range[chan->channel]].scale; |
| 343 | |
| 344 | /* Lookup new mode */ |
| 345 | for (i = 0; i < ARRAY_SIZE(ads8688_range_def); i++) |
| 346 | if (val == ads8688_range_def[i].offset && |
| 347 | scale == ads8688_range_def[i].scale) { |
| 348 | ret = ads8688_write_reg_range(indio_dev, chan, |
| 349 | ads8688_range_def[i].reg); |
| 350 | break; |
| 351 | } |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | if (!ret) |
| 356 | st->range[chan->channel] = ads8688_range_def[i].range; |
| 357 | |
| 358 | mutex_unlock(&st->lock); |
| 359 | |
| 360 | return ret; |
| 361 | } |
| 362 | |
| 363 | static int ads8688_write_raw_get_fmt(struct iio_dev *indio_dev, |
| 364 | struct iio_chan_spec const *chan, |
| 365 | long mask) |
| 366 | { |
| 367 | switch (mask) { |
| 368 | case IIO_CHAN_INFO_SCALE: |
| 369 | return IIO_VAL_INT_PLUS_NANO; |
| 370 | case IIO_CHAN_INFO_OFFSET: |
| 371 | return IIO_VAL_INT; |
| 372 | } |
| 373 | |
| 374 | return -EINVAL; |
| 375 | } |
| 376 | |
| 377 | static const struct iio_info ads8688_info = { |
| 378 | .read_raw = &ads8688_read_raw, |
| 379 | .write_raw = &ads8688_write_raw, |
| 380 | .write_raw_get_fmt = &ads8688_write_raw_get_fmt, |
| 381 | .attrs = &ads8688_attribute_group, |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 382 | }; |
| 383 | |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 384 | static irqreturn_t ads8688_trigger_handler(int irq, void *p) |
| 385 | { |
| 386 | struct iio_poll_func *pf = p; |
| 387 | struct iio_dev *indio_dev = pf->indio_dev; |
| 388 | u16 buffer[8]; |
| 389 | int i, j = 0; |
| 390 | |
| 391 | for (i = 0; i < indio_dev->masklength; i++) { |
| 392 | if (!test_bit(i, indio_dev->active_scan_mask)) |
| 393 | continue; |
| 394 | buffer[j] = ads8688_read(indio_dev, i); |
| 395 | j++; |
| 396 | } |
| 397 | |
| 398 | iio_push_to_buffers_with_timestamp(indio_dev, buffer, |
| 399 | pf->timestamp); |
| 400 | |
| 401 | iio_trigger_notify_done(indio_dev->trig); |
| 402 | |
| 403 | return IRQ_HANDLED; |
| 404 | } |
| 405 | |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 406 | static const struct ads8688_chip_info ads8688_chip_info_tbl[] = { |
| 407 | [ID_ADS8684] = { |
| 408 | .channels = ads8684_channels, |
| 409 | .num_channels = ARRAY_SIZE(ads8684_channels), |
| 410 | }, |
| 411 | [ID_ADS8688] = { |
| 412 | .channels = ads8688_channels, |
| 413 | .num_channels = ARRAY_SIZE(ads8688_channels), |
| 414 | }, |
| 415 | }; |
| 416 | |
| 417 | static int ads8688_probe(struct spi_device *spi) |
| 418 | { |
| 419 | struct ads8688_state *st; |
| 420 | struct iio_dev *indio_dev; |
| 421 | int ret; |
| 422 | |
| 423 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
| 424 | if (indio_dev == NULL) |
| 425 | return -ENOMEM; |
| 426 | |
| 427 | st = iio_priv(indio_dev); |
| 428 | |
| 429 | st->reg = devm_regulator_get_optional(&spi->dev, "vref"); |
| 430 | if (!IS_ERR(st->reg)) { |
| 431 | ret = regulator_enable(st->reg); |
| 432 | if (ret) |
| 433 | return ret; |
| 434 | |
| 435 | ret = regulator_get_voltage(st->reg); |
| 436 | if (ret < 0) |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 437 | goto err_regulator_disable; |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 438 | |
| 439 | st->vref_mv = ret / 1000; |
| 440 | } else { |
| 441 | /* Use internal reference */ |
| 442 | st->vref_mv = ADS8688_VREF_MV; |
| 443 | } |
| 444 | |
| 445 | st->chip_info = &ads8688_chip_info_tbl[spi_get_device_id(spi)->driver_data]; |
| 446 | |
| 447 | spi->mode = SPI_MODE_1; |
| 448 | |
| 449 | spi_set_drvdata(spi, indio_dev); |
| 450 | |
| 451 | st->spi = spi; |
| 452 | |
| 453 | indio_dev->name = spi_get_device_id(spi)->name; |
| 454 | indio_dev->dev.parent = &spi->dev; |
Matt Ranostay | b541eaf | 2016-07-02 17:26:33 -0700 | [diff] [blame] | 455 | indio_dev->dev.of_node = spi->dev.of_node; |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 456 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 457 | indio_dev->channels = st->chip_info->channels; |
| 458 | indio_dev->num_channels = st->chip_info->num_channels; |
| 459 | indio_dev->info = &ads8688_info; |
| 460 | |
| 461 | ads8688_reset(indio_dev); |
| 462 | |
| 463 | mutex_init(&st->lock); |
| 464 | |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 465 | ret = iio_triggered_buffer_setup(indio_dev, NULL, ads8688_trigger_handler, NULL); |
| 466 | if (ret < 0) { |
| 467 | dev_err(&spi->dev, "iio triggered buffer setup failed\n"); |
| 468 | goto err_regulator_disable; |
| 469 | } |
| 470 | |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 471 | ret = iio_device_register(indio_dev); |
| 472 | if (ret) |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 473 | goto err_buffer_cleanup; |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 474 | |
| 475 | return 0; |
| 476 | |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 477 | err_buffer_cleanup: |
| 478 | iio_triggered_buffer_cleanup(indio_dev); |
| 479 | |
| 480 | err_regulator_disable: |
Crt Mori | fbe84bd | 2016-09-05 11:14:49 +0200 | [diff] [blame] | 481 | if (!IS_ERR(st->reg)) |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 482 | regulator_disable(st->reg); |
| 483 | |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | static int ads8688_remove(struct spi_device *spi) |
| 488 | { |
| 489 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| 490 | struct ads8688_state *st = iio_priv(indio_dev); |
| 491 | |
| 492 | iio_device_unregister(indio_dev); |
Sean Nyekjaer | 2a864877 | 2018-05-09 20:17:18 +0200 | [diff] [blame] | 493 | iio_triggered_buffer_cleanup(indio_dev); |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 494 | |
Crt Mori | fbe84bd | 2016-09-05 11:14:49 +0200 | [diff] [blame] | 495 | if (!IS_ERR(st->reg)) |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 496 | regulator_disable(st->reg); |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static const struct spi_device_id ads8688_id[] = { |
| 502 | {"ads8684", ID_ADS8684}, |
| 503 | {"ads8688", ID_ADS8688}, |
| 504 | {} |
| 505 | }; |
| 506 | MODULE_DEVICE_TABLE(spi, ads8688_id); |
| 507 | |
| 508 | static const struct of_device_id ads8688_of_match[] = { |
| 509 | { .compatible = "ti,ads8684" }, |
| 510 | { .compatible = "ti,ads8688" }, |
| 511 | { } |
| 512 | }; |
| 513 | MODULE_DEVICE_TABLE(of, ads8688_of_match); |
| 514 | |
| 515 | static struct spi_driver ads8688_driver = { |
| 516 | .driver = { |
| 517 | .name = "ads8688", |
Sean Nyekjaer | 3e87e78 | 2015-11-09 13:52:59 +0100 | [diff] [blame] | 518 | }, |
| 519 | .probe = ads8688_probe, |
| 520 | .remove = ads8688_remove, |
| 521 | .id_table = ads8688_id, |
| 522 | }; |
| 523 | module_spi_driver(ads8688_driver); |
| 524 | |
| 525 | MODULE_AUTHOR("Sean Nyekjaer <sean.nyekjaer@prevas.dk>"); |
| 526 | MODULE_DESCRIPTION("Texas Instruments ADS8688 driver"); |
| 527 | MODULE_LICENSE("GPL v2"); |