Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 1 | /* |
| 2 | * AD5421 Digital to analog converters driver |
| 3 | * |
| 4 | * Copyright 2011 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/spi/spi.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/sysfs.h> |
| 18 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 19 | #include <linux/iio/iio.h> |
| 20 | #include <linux/iio/sysfs.h> |
| 21 | #include <linux/iio/events.h> |
Lars-Peter Clausen | dbdc025 | 2012-06-04 11:36:28 +0200 | [diff] [blame] | 22 | #include <linux/iio/dac/ad5421.h> |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 23 | |
| 24 | |
| 25 | #define AD5421_REG_DAC_DATA 0x1 |
| 26 | #define AD5421_REG_CTRL 0x2 |
| 27 | #define AD5421_REG_OFFSET 0x3 |
| 28 | #define AD5421_REG_GAIN 0x4 |
| 29 | /* load dac and fault shared the same register number. Writing to it will cause |
| 30 | * a dac load command, reading from it will return the fault status register */ |
| 31 | #define AD5421_REG_LOAD_DAC 0x5 |
| 32 | #define AD5421_REG_FAULT 0x5 |
| 33 | #define AD5421_REG_FORCE_ALARM_CURRENT 0x6 |
| 34 | #define AD5421_REG_RESET 0x7 |
| 35 | #define AD5421_REG_START_CONVERSION 0x8 |
| 36 | #define AD5421_REG_NOOP 0x9 |
| 37 | |
| 38 | #define AD5421_CTRL_WATCHDOG_DISABLE BIT(12) |
| 39 | #define AD5421_CTRL_AUTO_FAULT_READBACK BIT(11) |
| 40 | #define AD5421_CTRL_MIN_CURRENT BIT(9) |
| 41 | #define AD5421_CTRL_ADC_SOURCE_TEMP BIT(8) |
| 42 | #define AD5421_CTRL_ADC_ENABLE BIT(7) |
| 43 | #define AD5421_CTRL_PWR_DOWN_INT_VREF BIT(6) |
| 44 | |
| 45 | #define AD5421_FAULT_SPI BIT(15) |
| 46 | #define AD5421_FAULT_PEC BIT(14) |
| 47 | #define AD5421_FAULT_OVER_CURRENT BIT(13) |
| 48 | #define AD5421_FAULT_UNDER_CURRENT BIT(12) |
| 49 | #define AD5421_FAULT_TEMP_OVER_140 BIT(11) |
| 50 | #define AD5421_FAULT_TEMP_OVER_100 BIT(10) |
| 51 | #define AD5421_FAULT_UNDER_VOLTAGE_6V BIT(9) |
| 52 | #define AD5421_FAULT_UNDER_VOLTAGE_12V BIT(8) |
| 53 | |
| 54 | /* These bits will cause the fault pin to go high */ |
| 55 | #define AD5421_FAULT_TRIGGER_IRQ \ |
| 56 | (AD5421_FAULT_SPI | AD5421_FAULT_PEC | AD5421_FAULT_OVER_CURRENT | \ |
| 57 | AD5421_FAULT_UNDER_CURRENT | AD5421_FAULT_TEMP_OVER_140) |
| 58 | |
| 59 | /** |
| 60 | * struct ad5421_state - driver instance specific data |
| 61 | * @spi: spi_device |
| 62 | * @ctrl: control register cache |
| 63 | * @current_range: current range which the device is configured for |
| 64 | * @data: spi transfer buffers |
| 65 | * @fault_mask: software masking of events |
| 66 | */ |
| 67 | struct ad5421_state { |
| 68 | struct spi_device *spi; |
| 69 | unsigned int ctrl; |
| 70 | enum ad5421_current_range current_range; |
| 71 | unsigned int fault_mask; |
| 72 | |
| 73 | /* |
| 74 | * DMA (thus cache coherency maintenance) requires the |
| 75 | * transfer buffers to live in their own cache lines. |
| 76 | */ |
| 77 | union { |
| 78 | u32 d32; |
| 79 | u8 d8[4]; |
| 80 | } data[2] ____cacheline_aligned; |
| 81 | }; |
| 82 | |
| 83 | static const struct iio_chan_spec ad5421_channels[] = { |
| 84 | { |
| 85 | .type = IIO_CURRENT, |
| 86 | .indexed = 1, |
| 87 | .output = 1, |
| 88 | .channel = 0, |
Jonathan Cameron | 31311c2 | 2013-02-27 19:10:22 +0000 | [diff] [blame] | 89 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
| 90 | BIT(IIO_CHAN_INFO_CALIBSCALE) | |
| 91 | BIT(IIO_CHAN_INFO_CALIBBIAS), |
| 92 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | |
| 93 | BIT(IIO_CHAN_INFO_OFFSET), |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 94 | .scan_type = IIO_ST('u', 16, 16, 0), |
| 95 | .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | |
| 96 | IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), |
| 97 | }, |
| 98 | { |
| 99 | .type = IIO_TEMP, |
| 100 | .channel = -1, |
| 101 | .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), |
| 102 | }, |
| 103 | }; |
| 104 | |
| 105 | static int ad5421_write_unlocked(struct iio_dev *indio_dev, |
| 106 | unsigned int reg, unsigned int val) |
| 107 | { |
| 108 | struct ad5421_state *st = iio_priv(indio_dev); |
| 109 | |
| 110 | st->data[0].d32 = cpu_to_be32((reg << 16) | val); |
| 111 | |
| 112 | return spi_write(st->spi, &st->data[0].d8[1], 3); |
| 113 | } |
| 114 | |
| 115 | static int ad5421_write(struct iio_dev *indio_dev, unsigned int reg, |
| 116 | unsigned int val) |
| 117 | { |
| 118 | int ret; |
| 119 | |
| 120 | mutex_lock(&indio_dev->mlock); |
| 121 | ret = ad5421_write_unlocked(indio_dev, reg, val); |
| 122 | mutex_unlock(&indio_dev->mlock); |
| 123 | |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | static int ad5421_read(struct iio_dev *indio_dev, unsigned int reg) |
| 128 | { |
| 129 | struct ad5421_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 130 | int ret; |
| 131 | struct spi_transfer t[] = { |
| 132 | { |
| 133 | .tx_buf = &st->data[0].d8[1], |
| 134 | .len = 3, |
| 135 | .cs_change = 1, |
| 136 | }, { |
| 137 | .rx_buf = &st->data[1].d8[1], |
| 138 | .len = 3, |
| 139 | }, |
| 140 | }; |
| 141 | |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 142 | mutex_lock(&indio_dev->mlock); |
| 143 | |
| 144 | st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16)); |
| 145 | |
Lars-Peter Clausen | 14543a0 | 2013-01-09 17:31:00 +0000 | [diff] [blame] | 146 | ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 147 | if (ret >= 0) |
| 148 | ret = be32_to_cpu(st->data[1].d32) & 0xffff; |
| 149 | |
| 150 | mutex_unlock(&indio_dev->mlock); |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static int ad5421_update_ctrl(struct iio_dev *indio_dev, unsigned int set, |
| 156 | unsigned int clr) |
| 157 | { |
| 158 | struct ad5421_state *st = iio_priv(indio_dev); |
| 159 | unsigned int ret; |
| 160 | |
| 161 | mutex_lock(&indio_dev->mlock); |
| 162 | |
| 163 | st->ctrl &= ~clr; |
| 164 | st->ctrl |= set; |
| 165 | |
| 166 | ret = ad5421_write_unlocked(indio_dev, AD5421_REG_CTRL, st->ctrl); |
| 167 | |
| 168 | mutex_unlock(&indio_dev->mlock); |
| 169 | |
| 170 | return ret; |
| 171 | } |
| 172 | |
| 173 | static irqreturn_t ad5421_fault_handler(int irq, void *data) |
| 174 | { |
| 175 | struct iio_dev *indio_dev = data; |
| 176 | struct ad5421_state *st = iio_priv(indio_dev); |
| 177 | unsigned int fault; |
| 178 | unsigned int old_fault = 0; |
| 179 | unsigned int events; |
| 180 | |
| 181 | fault = ad5421_read(indio_dev, AD5421_REG_FAULT); |
| 182 | if (!fault) |
| 183 | return IRQ_NONE; |
| 184 | |
| 185 | /* If we had a fault, this might mean that the DAC has lost its state |
| 186 | * and has been reset. Make sure that the control register actually |
| 187 | * contains what we expect it to contain. Otherwise the watchdog might |
| 188 | * be enabled and we get watchdog timeout faults, which will render the |
| 189 | * DAC unusable. */ |
| 190 | ad5421_update_ctrl(indio_dev, 0, 0); |
| 191 | |
| 192 | |
| 193 | /* The fault pin stays high as long as a fault condition is present and |
| 194 | * it is not possible to mask fault conditions. For certain fault |
| 195 | * conditions for example like over-temperature it takes some time |
| 196 | * until the fault condition disappears. If we would exit the interrupt |
| 197 | * handler immediately after handling the event it would be entered |
| 198 | * again instantly. Thus we fall back to polling in case we detect that |
| 199 | * a interrupt condition is still present. |
| 200 | */ |
| 201 | do { |
| 202 | /* 0xffff is a invalid value for the register and will only be |
| 203 | * read if there has been a communication error */ |
| 204 | if (fault == 0xffff) |
| 205 | fault = 0; |
| 206 | |
| 207 | /* we are only interested in new events */ |
| 208 | events = (old_fault ^ fault) & fault; |
| 209 | events &= st->fault_mask; |
| 210 | |
| 211 | if (events & AD5421_FAULT_OVER_CURRENT) { |
| 212 | iio_push_event(indio_dev, |
| 213 | IIO_UNMOD_EVENT_CODE(IIO_CURRENT, |
| 214 | 0, |
| 215 | IIO_EV_TYPE_THRESH, |
| 216 | IIO_EV_DIR_RISING), |
| 217 | iio_get_time_ns()); |
| 218 | } |
| 219 | |
| 220 | if (events & AD5421_FAULT_UNDER_CURRENT) { |
| 221 | iio_push_event(indio_dev, |
| 222 | IIO_UNMOD_EVENT_CODE(IIO_CURRENT, |
| 223 | 0, |
| 224 | IIO_EV_TYPE_THRESH, |
| 225 | IIO_EV_DIR_FALLING), |
| 226 | iio_get_time_ns()); |
| 227 | } |
| 228 | |
| 229 | if (events & AD5421_FAULT_TEMP_OVER_140) { |
| 230 | iio_push_event(indio_dev, |
| 231 | IIO_UNMOD_EVENT_CODE(IIO_TEMP, |
| 232 | 0, |
| 233 | IIO_EV_TYPE_MAG, |
| 234 | IIO_EV_DIR_RISING), |
| 235 | iio_get_time_ns()); |
| 236 | } |
| 237 | |
| 238 | old_fault = fault; |
| 239 | fault = ad5421_read(indio_dev, AD5421_REG_FAULT); |
| 240 | |
| 241 | /* still active? go to sleep for some time */ |
| 242 | if (fault & AD5421_FAULT_TRIGGER_IRQ) |
| 243 | msleep(1000); |
| 244 | |
| 245 | } while (fault & AD5421_FAULT_TRIGGER_IRQ); |
| 246 | |
| 247 | |
| 248 | return IRQ_HANDLED; |
| 249 | } |
| 250 | |
| 251 | static void ad5421_get_current_min_max(struct ad5421_state *st, |
| 252 | unsigned int *min, unsigned int *max) |
| 253 | { |
| 254 | /* The current range is configured using external pins, which are |
| 255 | * usually hard-wired and not run-time switchable. */ |
| 256 | switch (st->current_range) { |
| 257 | case AD5421_CURRENT_RANGE_4mA_20mA: |
| 258 | *min = 4000; |
| 259 | *max = 20000; |
| 260 | break; |
| 261 | case AD5421_CURRENT_RANGE_3mA8_21mA: |
| 262 | *min = 3800; |
| 263 | *max = 21000; |
| 264 | break; |
| 265 | case AD5421_CURRENT_RANGE_3mA2_24mA: |
| 266 | *min = 3200; |
| 267 | *max = 24000; |
| 268 | break; |
| 269 | default: |
| 270 | *min = 0; |
| 271 | *max = 1; |
| 272 | break; |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | static inline unsigned int ad5421_get_offset(struct ad5421_state *st) |
| 277 | { |
| 278 | unsigned int min, max; |
| 279 | |
| 280 | ad5421_get_current_min_max(st, &min, &max); |
| 281 | return (min * (1 << 16)) / (max - min); |
| 282 | } |
| 283 | |
| 284 | static inline unsigned int ad5421_get_scale(struct ad5421_state *st) |
| 285 | { |
| 286 | unsigned int min, max; |
| 287 | |
| 288 | ad5421_get_current_min_max(st, &min, &max); |
| 289 | return ((max - min) * 1000) / (1 << 16); |
| 290 | } |
| 291 | |
| 292 | static int ad5421_read_raw(struct iio_dev *indio_dev, |
| 293 | struct iio_chan_spec const *chan, int *val, int *val2, long m) |
| 294 | { |
| 295 | struct ad5421_state *st = iio_priv(indio_dev); |
| 296 | int ret; |
| 297 | |
| 298 | if (chan->type != IIO_CURRENT) |
| 299 | return -EINVAL; |
| 300 | |
| 301 | switch (m) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 302 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 303 | ret = ad5421_read(indio_dev, AD5421_REG_DAC_DATA); |
| 304 | if (ret < 0) |
| 305 | return ret; |
| 306 | *val = ret; |
| 307 | return IIO_VAL_INT; |
| 308 | case IIO_CHAN_INFO_SCALE: |
| 309 | *val = 0; |
| 310 | *val2 = ad5421_get_scale(st); |
| 311 | return IIO_VAL_INT_PLUS_MICRO; |
| 312 | case IIO_CHAN_INFO_OFFSET: |
| 313 | *val = ad5421_get_offset(st); |
| 314 | return IIO_VAL_INT; |
| 315 | case IIO_CHAN_INFO_CALIBBIAS: |
| 316 | ret = ad5421_read(indio_dev, AD5421_REG_OFFSET); |
| 317 | if (ret < 0) |
| 318 | return ret; |
| 319 | *val = ret - 32768; |
| 320 | return IIO_VAL_INT; |
| 321 | case IIO_CHAN_INFO_CALIBSCALE: |
| 322 | ret = ad5421_read(indio_dev, AD5421_REG_GAIN); |
| 323 | if (ret < 0) |
| 324 | return ret; |
| 325 | *val = ret; |
| 326 | return IIO_VAL_INT; |
| 327 | } |
| 328 | |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | |
| 332 | static int ad5421_write_raw(struct iio_dev *indio_dev, |
| 333 | struct iio_chan_spec const *chan, int val, int val2, long mask) |
| 334 | { |
| 335 | const unsigned int max_val = 1 << 16; |
| 336 | |
| 337 | switch (mask) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 338 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 339 | if (val >= max_val || val < 0) |
| 340 | return -EINVAL; |
| 341 | |
| 342 | return ad5421_write(indio_dev, AD5421_REG_DAC_DATA, val); |
| 343 | case IIO_CHAN_INFO_CALIBBIAS: |
| 344 | val += 32768; |
| 345 | if (val >= max_val || val < 0) |
| 346 | return -EINVAL; |
| 347 | |
| 348 | return ad5421_write(indio_dev, AD5421_REG_OFFSET, val); |
| 349 | case IIO_CHAN_INFO_CALIBSCALE: |
| 350 | if (val >= max_val || val < 0) |
| 351 | return -EINVAL; |
| 352 | |
| 353 | return ad5421_write(indio_dev, AD5421_REG_GAIN, val); |
| 354 | default: |
| 355 | break; |
| 356 | } |
| 357 | |
| 358 | return -EINVAL; |
| 359 | } |
| 360 | |
| 361 | static int ad5421_write_event_config(struct iio_dev *indio_dev, |
| 362 | u64 event_code, int state) |
| 363 | { |
| 364 | struct ad5421_state *st = iio_priv(indio_dev); |
| 365 | unsigned int mask; |
| 366 | |
| 367 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
| 368 | case IIO_CURRENT: |
| 369 | if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == |
| 370 | IIO_EV_DIR_RISING) |
| 371 | mask = AD5421_FAULT_OVER_CURRENT; |
| 372 | else |
| 373 | mask = AD5421_FAULT_UNDER_CURRENT; |
| 374 | break; |
| 375 | case IIO_TEMP: |
| 376 | mask = AD5421_FAULT_TEMP_OVER_140; |
| 377 | break; |
| 378 | default: |
| 379 | return -EINVAL; |
| 380 | } |
| 381 | |
| 382 | mutex_lock(&indio_dev->mlock); |
| 383 | if (state) |
| 384 | st->fault_mask |= mask; |
| 385 | else |
| 386 | st->fault_mask &= ~mask; |
| 387 | mutex_unlock(&indio_dev->mlock); |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static int ad5421_read_event_config(struct iio_dev *indio_dev, |
| 393 | u64 event_code) |
| 394 | { |
| 395 | struct ad5421_state *st = iio_priv(indio_dev); |
| 396 | unsigned int mask; |
| 397 | |
| 398 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
| 399 | case IIO_CURRENT: |
| 400 | if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == |
| 401 | IIO_EV_DIR_RISING) |
| 402 | mask = AD5421_FAULT_OVER_CURRENT; |
| 403 | else |
| 404 | mask = AD5421_FAULT_UNDER_CURRENT; |
| 405 | break; |
| 406 | case IIO_TEMP: |
| 407 | mask = AD5421_FAULT_TEMP_OVER_140; |
| 408 | break; |
| 409 | default: |
| 410 | return -EINVAL; |
| 411 | } |
| 412 | |
| 413 | return (bool)(st->fault_mask & mask); |
| 414 | } |
| 415 | |
| 416 | static int ad5421_read_event_value(struct iio_dev *indio_dev, u64 event_code, |
| 417 | int *val) |
| 418 | { |
| 419 | int ret; |
| 420 | |
| 421 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
| 422 | case IIO_CURRENT: |
| 423 | ret = ad5421_read(indio_dev, AD5421_REG_DAC_DATA); |
| 424 | if (ret < 0) |
| 425 | return ret; |
| 426 | *val = ret; |
| 427 | break; |
| 428 | case IIO_TEMP: |
| 429 | *val = 140000; |
| 430 | break; |
| 431 | default: |
| 432 | return -EINVAL; |
| 433 | } |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static const struct iio_info ad5421_info = { |
| 439 | .read_raw = ad5421_read_raw, |
| 440 | .write_raw = ad5421_write_raw, |
| 441 | .read_event_config = ad5421_read_event_config, |
| 442 | .write_event_config = ad5421_write_event_config, |
| 443 | .read_event_value = ad5421_read_event_value, |
| 444 | .driver_module = THIS_MODULE, |
| 445 | }; |
| 446 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 447 | static int ad5421_probe(struct spi_device *spi) |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 448 | { |
| 449 | struct ad5421_platform_data *pdata = dev_get_platdata(&spi->dev); |
| 450 | struct iio_dev *indio_dev; |
| 451 | struct ad5421_state *st; |
| 452 | int ret; |
| 453 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 454 | indio_dev = iio_device_alloc(sizeof(*st)); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 455 | if (indio_dev == NULL) { |
| 456 | dev_err(&spi->dev, "Failed to allocate iio device\n"); |
| 457 | return -ENOMEM; |
| 458 | } |
| 459 | |
| 460 | st = iio_priv(indio_dev); |
| 461 | spi_set_drvdata(spi, indio_dev); |
| 462 | |
| 463 | st->spi = spi; |
| 464 | |
| 465 | indio_dev->dev.parent = &spi->dev; |
| 466 | indio_dev->name = "ad5421"; |
| 467 | indio_dev->info = &ad5421_info; |
| 468 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 469 | indio_dev->channels = ad5421_channels; |
| 470 | indio_dev->num_channels = ARRAY_SIZE(ad5421_channels); |
| 471 | |
| 472 | st->ctrl = AD5421_CTRL_WATCHDOG_DISABLE | |
| 473 | AD5421_CTRL_AUTO_FAULT_READBACK; |
| 474 | |
| 475 | if (pdata) { |
| 476 | st->current_range = pdata->current_range; |
| 477 | if (pdata->external_vref) |
| 478 | st->ctrl |= AD5421_CTRL_PWR_DOWN_INT_VREF; |
| 479 | } else { |
| 480 | st->current_range = AD5421_CURRENT_RANGE_4mA_20mA; |
| 481 | } |
| 482 | |
| 483 | /* write initial ctrl register value */ |
| 484 | ad5421_update_ctrl(indio_dev, 0, 0); |
| 485 | |
| 486 | if (spi->irq) { |
| 487 | ret = request_threaded_irq(spi->irq, |
| 488 | NULL, |
| 489 | ad5421_fault_handler, |
| 490 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
| 491 | "ad5421 fault", |
| 492 | indio_dev); |
| 493 | if (ret) |
| 494 | goto error_free; |
| 495 | } |
| 496 | |
| 497 | ret = iio_device_register(indio_dev); |
| 498 | if (ret) { |
| 499 | dev_err(&spi->dev, "Failed to register iio device: %d\n", ret); |
| 500 | goto error_free_irq; |
| 501 | } |
| 502 | |
| 503 | return 0; |
| 504 | |
| 505 | error_free_irq: |
| 506 | if (spi->irq) |
| 507 | free_irq(spi->irq, indio_dev); |
| 508 | error_free: |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 509 | iio_device_free(indio_dev); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 510 | |
| 511 | return ret; |
| 512 | } |
| 513 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 514 | static int ad5421_remove(struct spi_device *spi) |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 515 | { |
| 516 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| 517 | |
| 518 | iio_device_unregister(indio_dev); |
| 519 | if (spi->irq) |
| 520 | free_irq(spi->irq, indio_dev); |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 521 | iio_device_free(indio_dev); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 522 | |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static struct spi_driver ad5421_driver = { |
| 527 | .driver = { |
| 528 | .name = "ad5421", |
| 529 | .owner = THIS_MODULE, |
| 530 | }, |
| 531 | .probe = ad5421_probe, |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 532 | .remove = ad5421_remove, |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 533 | }; |
Lars-Peter Clausen | 519ff1d | 2012-02-20 19:42:38 +0100 | [diff] [blame] | 534 | module_spi_driver(ad5421_driver); |
Lars-Peter Clausen | 5691b23 | 2011-11-02 09:40:02 +0100 | [diff] [blame] | 535 | |
| 536 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 537 | MODULE_DESCRIPTION("Analog Devices AD5421 DAC"); |
| 538 | MODULE_LICENSE("GPL v2"); |
| 539 | MODULE_ALIAS("spi:ad5421"); |