Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Analog devices AD5360, AD5361, AD5362, AD5363, AD5370, AD5371, AD5373 |
| 3 | * multi-channel Digital to Analog Converters driver |
| 4 | * |
| 5 | * Copyright 2011 Analog Devices Inc. |
| 6 | * |
| 7 | * Licensed under the GPL-2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/spi/spi.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/sysfs.h> |
| 17 | #include <linux/regulator/consumer.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> |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 21 | |
| 22 | #define AD5360_CMD(x) ((x) << 22) |
| 23 | #define AD5360_ADDR(x) ((x) << 16) |
| 24 | |
| 25 | #define AD5360_READBACK_TYPE(x) ((x) << 13) |
| 26 | #define AD5360_READBACK_ADDR(x) ((x) << 7) |
| 27 | |
| 28 | #define AD5360_CHAN_ADDR(chan) ((chan) + 0x8) |
| 29 | |
| 30 | #define AD5360_CMD_WRITE_DATA 0x3 |
| 31 | #define AD5360_CMD_WRITE_OFFSET 0x2 |
| 32 | #define AD5360_CMD_WRITE_GAIN 0x1 |
| 33 | #define AD5360_CMD_SPECIAL_FUNCTION 0x0 |
| 34 | |
| 35 | /* Special function register addresses */ |
| 36 | #define AD5360_REG_SF_NOP 0x0 |
| 37 | #define AD5360_REG_SF_CTRL 0x1 |
| 38 | #define AD5360_REG_SF_OFS(x) (0x2 + (x)) |
| 39 | #define AD5360_REG_SF_READBACK 0x5 |
| 40 | |
| 41 | #define AD5360_SF_CTRL_PWR_DOWN BIT(0) |
| 42 | |
| 43 | #define AD5360_READBACK_X1A 0x0 |
| 44 | #define AD5360_READBACK_X1B 0x1 |
| 45 | #define AD5360_READBACK_OFFSET 0x2 |
| 46 | #define AD5360_READBACK_GAIN 0x3 |
| 47 | #define AD5360_READBACK_SF 0x4 |
| 48 | |
| 49 | |
| 50 | /** |
| 51 | * struct ad5360_chip_info - chip specific information |
| 52 | * @channel_template: channel specification template |
| 53 | * @num_channels: number of channels |
| 54 | * @channels_per_group: number of channels per group |
| 55 | * @num_vrefs: number of vref supplies for the chip |
| 56 | */ |
| 57 | |
| 58 | struct ad5360_chip_info { |
| 59 | struct iio_chan_spec channel_template; |
| 60 | unsigned int num_channels; |
| 61 | unsigned int channels_per_group; |
| 62 | unsigned int num_vrefs; |
| 63 | }; |
| 64 | |
| 65 | /** |
| 66 | * struct ad5360_state - driver instance specific data |
| 67 | * @spi: spi_device |
| 68 | * @chip_info: chip model specific constants, available modes etc |
| 69 | * @vref_reg: vref supply regulators |
| 70 | * @ctrl: control register cache |
| 71 | * @data: spi transfer buffers |
| 72 | */ |
| 73 | |
| 74 | struct ad5360_state { |
| 75 | struct spi_device *spi; |
| 76 | const struct ad5360_chip_info *chip_info; |
| 77 | struct regulator_bulk_data vref_reg[3]; |
| 78 | unsigned int ctrl; |
| 79 | |
| 80 | /* |
| 81 | * DMA (thus cache coherency maintenance) requires the |
| 82 | * transfer buffers to live in their own cache lines. |
| 83 | */ |
| 84 | union { |
| 85 | __be32 d32; |
| 86 | u8 d8[4]; |
| 87 | } data[2] ____cacheline_aligned; |
| 88 | }; |
| 89 | |
| 90 | enum ad5360_type { |
| 91 | ID_AD5360, |
| 92 | ID_AD5361, |
| 93 | ID_AD5362, |
| 94 | ID_AD5363, |
| 95 | ID_AD5370, |
| 96 | ID_AD5371, |
| 97 | ID_AD5372, |
| 98 | ID_AD5373, |
| 99 | }; |
| 100 | |
| 101 | #define AD5360_CHANNEL(bits) { \ |
| 102 | .type = IIO_VOLTAGE, \ |
| 103 | .indexed = 1, \ |
| 104 | .output = 1, \ |
Jonathan Cameron | 1727a30 | 2013-02-27 19:08:52 +0000 | [diff] [blame] | 105 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
| 106 | BIT(IIO_CHAN_INFO_SCALE) | \ |
| 107 | BIT(IIO_CHAN_INFO_OFFSET) | \ |
| 108 | BIT(IIO_CHAN_INFO_CALIBSCALE) | \ |
| 109 | BIT(IIO_CHAN_INFO_CALIBBIAS), \ |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 110 | .scan_type = IIO_ST('u', (bits), 16, 16 - (bits)) \ |
| 111 | } |
| 112 | |
| 113 | static const struct ad5360_chip_info ad5360_chip_info_tbl[] = { |
| 114 | [ID_AD5360] = { |
| 115 | .channel_template = AD5360_CHANNEL(16), |
| 116 | .num_channels = 16, |
| 117 | .channels_per_group = 8, |
| 118 | .num_vrefs = 2, |
| 119 | }, |
| 120 | [ID_AD5361] = { |
| 121 | .channel_template = AD5360_CHANNEL(14), |
| 122 | .num_channels = 16, |
| 123 | .channels_per_group = 8, |
| 124 | .num_vrefs = 2, |
| 125 | }, |
| 126 | [ID_AD5362] = { |
| 127 | .channel_template = AD5360_CHANNEL(16), |
| 128 | .num_channels = 8, |
| 129 | .channels_per_group = 4, |
| 130 | .num_vrefs = 2, |
| 131 | }, |
| 132 | [ID_AD5363] = { |
| 133 | .channel_template = AD5360_CHANNEL(14), |
| 134 | .num_channels = 8, |
| 135 | .channels_per_group = 4, |
| 136 | .num_vrefs = 2, |
| 137 | }, |
| 138 | [ID_AD5370] = { |
| 139 | .channel_template = AD5360_CHANNEL(16), |
| 140 | .num_channels = 40, |
| 141 | .channels_per_group = 8, |
| 142 | .num_vrefs = 2, |
| 143 | }, |
| 144 | [ID_AD5371] = { |
| 145 | .channel_template = AD5360_CHANNEL(14), |
| 146 | .num_channels = 40, |
| 147 | .channels_per_group = 8, |
| 148 | .num_vrefs = 3, |
| 149 | }, |
| 150 | [ID_AD5372] = { |
| 151 | .channel_template = AD5360_CHANNEL(16), |
| 152 | .num_channels = 32, |
| 153 | .channels_per_group = 8, |
| 154 | .num_vrefs = 2, |
| 155 | }, |
| 156 | [ID_AD5373] = { |
| 157 | .channel_template = AD5360_CHANNEL(14), |
| 158 | .num_channels = 32, |
| 159 | .channels_per_group = 8, |
| 160 | .num_vrefs = 2, |
| 161 | }, |
| 162 | }; |
| 163 | |
| 164 | static unsigned int ad5360_get_channel_vref_index(struct ad5360_state *st, |
| 165 | unsigned int channel) |
| 166 | { |
| 167 | unsigned int i; |
| 168 | |
| 169 | /* The first groups have their own vref, while the remaining groups |
| 170 | * share the last vref */ |
| 171 | i = channel / st->chip_info->channels_per_group; |
| 172 | if (i >= st->chip_info->num_vrefs) |
| 173 | i = st->chip_info->num_vrefs - 1; |
| 174 | |
| 175 | return i; |
| 176 | } |
| 177 | |
| 178 | static int ad5360_get_channel_vref(struct ad5360_state *st, |
| 179 | unsigned int channel) |
| 180 | { |
| 181 | unsigned int i = ad5360_get_channel_vref_index(st, channel); |
| 182 | |
| 183 | return regulator_get_voltage(st->vref_reg[i].consumer); |
| 184 | } |
| 185 | |
| 186 | |
| 187 | static int ad5360_write_unlocked(struct iio_dev *indio_dev, |
| 188 | unsigned int cmd, unsigned int addr, unsigned int val, |
| 189 | unsigned int shift) |
| 190 | { |
| 191 | struct ad5360_state *st = iio_priv(indio_dev); |
| 192 | |
| 193 | val <<= shift; |
| 194 | val |= AD5360_CMD(cmd) | AD5360_ADDR(addr); |
| 195 | st->data[0].d32 = cpu_to_be32(val); |
| 196 | |
| 197 | return spi_write(st->spi, &st->data[0].d8[1], 3); |
| 198 | } |
| 199 | |
| 200 | static int ad5360_write(struct iio_dev *indio_dev, unsigned int cmd, |
| 201 | unsigned int addr, unsigned int val, unsigned int shift) |
| 202 | { |
| 203 | int ret; |
| 204 | |
| 205 | mutex_lock(&indio_dev->mlock); |
| 206 | ret = ad5360_write_unlocked(indio_dev, cmd, addr, val, shift); |
| 207 | mutex_unlock(&indio_dev->mlock); |
| 208 | |
| 209 | return ret; |
| 210 | } |
| 211 | |
| 212 | static int ad5360_read(struct iio_dev *indio_dev, unsigned int type, |
| 213 | unsigned int addr) |
| 214 | { |
| 215 | struct ad5360_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 216 | int ret; |
| 217 | struct spi_transfer t[] = { |
| 218 | { |
| 219 | .tx_buf = &st->data[0].d8[1], |
| 220 | .len = 3, |
| 221 | .cs_change = 1, |
| 222 | }, { |
| 223 | .rx_buf = &st->data[1].d8[1], |
| 224 | .len = 3, |
| 225 | }, |
| 226 | }; |
| 227 | |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 228 | mutex_lock(&indio_dev->mlock); |
| 229 | |
| 230 | st->data[0].d32 = cpu_to_be32(AD5360_CMD(AD5360_CMD_SPECIAL_FUNCTION) | |
| 231 | AD5360_ADDR(AD5360_REG_SF_READBACK) | |
| 232 | AD5360_READBACK_TYPE(type) | |
| 233 | AD5360_READBACK_ADDR(addr)); |
| 234 | |
Lars-Peter Clausen | 14543a0 | 2013-01-09 17:31:00 +0000 | [diff] [blame] | 235 | ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 236 | if (ret >= 0) |
| 237 | ret = be32_to_cpu(st->data[1].d32) & 0xffff; |
| 238 | |
| 239 | mutex_unlock(&indio_dev->mlock); |
| 240 | |
| 241 | return ret; |
| 242 | } |
| 243 | |
| 244 | static ssize_t ad5360_read_dac_powerdown(struct device *dev, |
| 245 | struct device_attribute *attr, |
| 246 | char *buf) |
| 247 | { |
Lars-Peter Clausen | ac3f851 | 2012-05-12 15:39:46 +0200 | [diff] [blame] | 248 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 249 | struct ad5360_state *st = iio_priv(indio_dev); |
| 250 | |
| 251 | return sprintf(buf, "%d\n", (bool)(st->ctrl & AD5360_SF_CTRL_PWR_DOWN)); |
| 252 | } |
| 253 | |
| 254 | static int ad5360_update_ctrl(struct iio_dev *indio_dev, unsigned int set, |
| 255 | unsigned int clr) |
| 256 | { |
| 257 | struct ad5360_state *st = iio_priv(indio_dev); |
| 258 | unsigned int ret; |
| 259 | |
| 260 | mutex_lock(&indio_dev->mlock); |
| 261 | |
| 262 | st->ctrl |= set; |
| 263 | st->ctrl &= ~clr; |
| 264 | |
| 265 | ret = ad5360_write_unlocked(indio_dev, AD5360_CMD_SPECIAL_FUNCTION, |
| 266 | AD5360_REG_SF_CTRL, st->ctrl, 0); |
| 267 | |
| 268 | mutex_unlock(&indio_dev->mlock); |
| 269 | |
| 270 | return ret; |
| 271 | } |
| 272 | |
| 273 | static ssize_t ad5360_write_dac_powerdown(struct device *dev, |
| 274 | struct device_attribute *attr, const char *buf, size_t len) |
| 275 | { |
Lars-Peter Clausen | ac3f851 | 2012-05-12 15:39:46 +0200 | [diff] [blame] | 276 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 277 | bool pwr_down; |
| 278 | int ret; |
| 279 | |
| 280 | ret = strtobool(buf, &pwr_down); |
| 281 | if (ret) |
| 282 | return ret; |
| 283 | |
| 284 | if (pwr_down) |
| 285 | ret = ad5360_update_ctrl(indio_dev, AD5360_SF_CTRL_PWR_DOWN, 0); |
| 286 | else |
| 287 | ret = ad5360_update_ctrl(indio_dev, 0, AD5360_SF_CTRL_PWR_DOWN); |
| 288 | |
| 289 | return ret ? ret : len; |
| 290 | } |
| 291 | |
| 292 | static IIO_DEVICE_ATTR(out_voltage_powerdown, |
| 293 | S_IRUGO | S_IWUSR, |
| 294 | ad5360_read_dac_powerdown, |
| 295 | ad5360_write_dac_powerdown, 0); |
| 296 | |
| 297 | static struct attribute *ad5360_attributes[] = { |
| 298 | &iio_dev_attr_out_voltage_powerdown.dev_attr.attr, |
| 299 | NULL, |
| 300 | }; |
| 301 | |
| 302 | static const struct attribute_group ad5360_attribute_group = { |
| 303 | .attrs = ad5360_attributes, |
| 304 | }; |
| 305 | |
| 306 | static int ad5360_write_raw(struct iio_dev *indio_dev, |
| 307 | struct iio_chan_spec const *chan, |
| 308 | int val, |
| 309 | int val2, |
| 310 | long mask) |
| 311 | { |
| 312 | struct ad5360_state *st = iio_priv(indio_dev); |
| 313 | int max_val = (1 << chan->scan_type.realbits); |
| 314 | unsigned int ofs_index; |
| 315 | |
| 316 | switch (mask) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 317 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 318 | if (val >= max_val || val < 0) |
| 319 | return -EINVAL; |
| 320 | |
| 321 | return ad5360_write(indio_dev, AD5360_CMD_WRITE_DATA, |
| 322 | chan->address, val, chan->scan_type.shift); |
| 323 | |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 324 | case IIO_CHAN_INFO_CALIBBIAS: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 325 | if (val >= max_val || val < 0) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | return ad5360_write(indio_dev, AD5360_CMD_WRITE_OFFSET, |
| 329 | chan->address, val, chan->scan_type.shift); |
| 330 | |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 331 | case IIO_CHAN_INFO_CALIBSCALE: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 332 | if (val >= max_val || val < 0) |
| 333 | return -EINVAL; |
| 334 | |
| 335 | return ad5360_write(indio_dev, AD5360_CMD_WRITE_GAIN, |
| 336 | chan->address, val, chan->scan_type.shift); |
| 337 | |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 338 | case IIO_CHAN_INFO_OFFSET: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 339 | if (val <= -max_val || val > 0) |
| 340 | return -EINVAL; |
| 341 | |
| 342 | val = -val; |
| 343 | |
| 344 | /* offset is supposed to have the same scale as raw, but it |
| 345 | * is always 14bits wide, so on a chip where the raw value has |
| 346 | * more bits, we need to shift offset. */ |
| 347 | val >>= (chan->scan_type.realbits - 14); |
| 348 | |
| 349 | /* There is one DAC offset register per vref. Changing one |
| 350 | * channels offset will also change the offset for all other |
| 351 | * channels which share the same vref supply. */ |
| 352 | ofs_index = ad5360_get_channel_vref_index(st, chan->channel); |
| 353 | return ad5360_write(indio_dev, AD5360_CMD_SPECIAL_FUNCTION, |
| 354 | AD5360_REG_SF_OFS(ofs_index), val, 0); |
| 355 | default: |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | return -EINVAL; |
| 360 | } |
| 361 | |
| 362 | static int ad5360_read_raw(struct iio_dev *indio_dev, |
| 363 | struct iio_chan_spec const *chan, |
| 364 | int *val, |
| 365 | int *val2, |
| 366 | long m) |
| 367 | { |
| 368 | struct ad5360_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 369 | unsigned int ofs_index; |
Dan Carpenter | 685e010 | 2011-10-29 10:21:06 +0300 | [diff] [blame] | 370 | int scale_uv; |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 371 | int ret; |
| 372 | |
| 373 | switch (m) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 374 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 375 | ret = ad5360_read(indio_dev, AD5360_READBACK_X1A, |
| 376 | chan->address); |
| 377 | if (ret < 0) |
| 378 | return ret; |
| 379 | *val = ret >> chan->scan_type.shift; |
| 380 | return IIO_VAL_INT; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 381 | case IIO_CHAN_INFO_SCALE: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 382 | /* vout = 4 * vref * dac_code */ |
| 383 | scale_uv = ad5360_get_channel_vref(st, chan->channel) * 4 * 100; |
| 384 | if (scale_uv < 0) |
| 385 | return scale_uv; |
| 386 | |
| 387 | scale_uv >>= (chan->scan_type.realbits); |
| 388 | *val = scale_uv / 100000; |
| 389 | *val2 = (scale_uv % 100000) * 10; |
| 390 | return IIO_VAL_INT_PLUS_MICRO; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 391 | case IIO_CHAN_INFO_CALIBBIAS: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 392 | ret = ad5360_read(indio_dev, AD5360_READBACK_OFFSET, |
| 393 | chan->address); |
| 394 | if (ret < 0) |
| 395 | return ret; |
| 396 | *val = ret; |
| 397 | return IIO_VAL_INT; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 398 | case IIO_CHAN_INFO_CALIBSCALE: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 399 | ret = ad5360_read(indio_dev, AD5360_READBACK_GAIN, |
| 400 | chan->address); |
| 401 | if (ret < 0) |
| 402 | return ret; |
| 403 | *val = ret; |
| 404 | return IIO_VAL_INT; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 405 | case IIO_CHAN_INFO_OFFSET: |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 406 | ofs_index = ad5360_get_channel_vref_index(st, chan->channel); |
| 407 | ret = ad5360_read(indio_dev, AD5360_READBACK_SF, |
| 408 | AD5360_REG_SF_OFS(ofs_index)); |
| 409 | if (ret < 0) |
| 410 | return ret; |
| 411 | |
| 412 | ret <<= (chan->scan_type.realbits - 14); |
| 413 | *val = -ret; |
| 414 | return IIO_VAL_INT; |
| 415 | } |
| 416 | |
| 417 | return -EINVAL; |
| 418 | } |
| 419 | |
| 420 | static const struct iio_info ad5360_info = { |
| 421 | .read_raw = ad5360_read_raw, |
| 422 | .write_raw = ad5360_write_raw, |
| 423 | .attrs = &ad5360_attribute_group, |
| 424 | .driver_module = THIS_MODULE, |
| 425 | }; |
| 426 | |
| 427 | static const char * const ad5360_vref_name[] = { |
| 428 | "vref0", "vref1", "vref2" |
| 429 | }; |
| 430 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 431 | static int ad5360_alloc_channels(struct iio_dev *indio_dev) |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 432 | { |
| 433 | struct ad5360_state *st = iio_priv(indio_dev); |
| 434 | struct iio_chan_spec *channels; |
| 435 | unsigned int i; |
| 436 | |
Axel Lin | 09f993e | 2012-02-11 09:00:48 +0800 | [diff] [blame] | 437 | channels = kcalloc(st->chip_info->num_channels, |
| 438 | sizeof(struct iio_chan_spec), GFP_KERNEL); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 439 | |
| 440 | if (!channels) |
| 441 | return -ENOMEM; |
| 442 | |
| 443 | for (i = 0; i < st->chip_info->num_channels; ++i) { |
| 444 | channels[i] = st->chip_info->channel_template; |
| 445 | channels[i].channel = i; |
| 446 | channels[i].address = AD5360_CHAN_ADDR(i); |
| 447 | } |
| 448 | |
| 449 | indio_dev->channels = channels; |
| 450 | |
| 451 | return 0; |
| 452 | } |
| 453 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 454 | static int ad5360_probe(struct spi_device *spi) |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 455 | { |
| 456 | enum ad5360_type type = spi_get_device_id(spi)->driver_data; |
| 457 | struct iio_dev *indio_dev; |
| 458 | struct ad5360_state *st; |
| 459 | unsigned int i; |
| 460 | int ret; |
| 461 | |
Sachin Kamat | 400d36e | 2013-08-19 12:38:00 +0100 | [diff] [blame] | 462 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 463 | if (indio_dev == NULL) { |
| 464 | dev_err(&spi->dev, "Failed to allocate iio device\n"); |
| 465 | return -ENOMEM; |
| 466 | } |
| 467 | |
| 468 | st = iio_priv(indio_dev); |
| 469 | spi_set_drvdata(spi, indio_dev); |
| 470 | |
| 471 | st->chip_info = &ad5360_chip_info_tbl[type]; |
| 472 | st->spi = spi; |
| 473 | |
| 474 | indio_dev->dev.parent = &spi->dev; |
| 475 | indio_dev->name = spi_get_device_id(spi)->name; |
| 476 | indio_dev->info = &ad5360_info; |
| 477 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 478 | indio_dev->num_channels = st->chip_info->num_channels; |
| 479 | |
| 480 | ret = ad5360_alloc_channels(indio_dev); |
| 481 | if (ret) { |
| 482 | dev_err(&spi->dev, "Failed to allocate channel spec: %d\n", ret); |
Sachin Kamat | 400d36e | 2013-08-19 12:38:00 +0100 | [diff] [blame] | 483 | return ret; |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | for (i = 0; i < st->chip_info->num_vrefs; ++i) |
| 487 | st->vref_reg[i].supply = ad5360_vref_name[i]; |
| 488 | |
Sachin Kamat | 400d36e | 2013-08-19 12:38:00 +0100 | [diff] [blame] | 489 | ret = devm_regulator_bulk_get(&st->spi->dev, st->chip_info->num_vrefs, |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 490 | st->vref_reg); |
| 491 | if (ret) { |
| 492 | dev_err(&spi->dev, "Failed to request vref regulators: %d\n", ret); |
| 493 | goto error_free_channels; |
| 494 | } |
| 495 | |
| 496 | ret = regulator_bulk_enable(st->chip_info->num_vrefs, st->vref_reg); |
| 497 | if (ret) { |
| 498 | dev_err(&spi->dev, "Failed to enable vref regulators: %d\n", ret); |
Sachin Kamat | 400d36e | 2013-08-19 12:38:00 +0100 | [diff] [blame] | 499 | goto error_free_channels; |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | ret = iio_device_register(indio_dev); |
| 503 | if (ret) { |
| 504 | dev_err(&spi->dev, "Failed to register iio device: %d\n", ret); |
| 505 | goto error_disable_reg; |
| 506 | } |
| 507 | |
| 508 | return 0; |
| 509 | |
| 510 | error_disable_reg: |
| 511 | regulator_bulk_disable(st->chip_info->num_vrefs, st->vref_reg); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 512 | error_free_channels: |
| 513 | kfree(indio_dev->channels); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 514 | |
| 515 | return ret; |
| 516 | } |
| 517 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 518 | static int ad5360_remove(struct spi_device *spi) |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 519 | { |
| 520 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| 521 | struct ad5360_state *st = iio_priv(indio_dev); |
| 522 | |
| 523 | iio_device_unregister(indio_dev); |
| 524 | |
| 525 | kfree(indio_dev->channels); |
| 526 | |
| 527 | regulator_bulk_disable(st->chip_info->num_vrefs, st->vref_reg); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | static const struct spi_device_id ad5360_ids[] = { |
| 533 | { "ad5360", ID_AD5360 }, |
| 534 | { "ad5361", ID_AD5361 }, |
| 535 | { "ad5362", ID_AD5362 }, |
| 536 | { "ad5363", ID_AD5363 }, |
| 537 | { "ad5370", ID_AD5370 }, |
| 538 | { "ad5371", ID_AD5371 }, |
| 539 | { "ad5372", ID_AD5372 }, |
| 540 | { "ad5373", ID_AD5373 }, |
| 541 | {} |
| 542 | }; |
| 543 | MODULE_DEVICE_TABLE(spi, ad5360_ids); |
| 544 | |
| 545 | static struct spi_driver ad5360_driver = { |
| 546 | .driver = { |
| 547 | .name = "ad5360", |
| 548 | .owner = THIS_MODULE, |
| 549 | }, |
| 550 | .probe = ad5360_probe, |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 551 | .remove = ad5360_remove, |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 552 | .id_table = ad5360_ids, |
| 553 | }; |
Lars-Peter Clausen | ae6ae6f | 2011-11-16 10:13:39 +0100 | [diff] [blame] | 554 | module_spi_driver(ad5360_driver); |
Lars-Peter Clausen | a3e2940 | 2011-10-20 10:46:38 +0200 | [diff] [blame] | 555 | |
| 556 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 557 | MODULE_DESCRIPTION("Analog Devices AD5360/61/62/63/70/71/72/73 DAC"); |
| 558 | MODULE_LICENSE("GPL v2"); |