Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the ADC present in the Atmel AT91 evaluation boards. |
| 3 | * |
| 4 | * Copyright 2011 Free Electrons |
| 5 | * |
| 6 | * Licensed under the GPLv2 or later. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/bitmap.h> |
| 10 | #include <linux/bitops.h> |
| 11 | #include <linux/clk.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/jiffies.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 18 | #include <linux/of.h> |
| 19 | #include <linux/of_device.h> |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/wait.h> |
| 24 | |
| 25 | #include <linux/platform_data/at91_adc.h> |
| 26 | |
| 27 | #include <linux/iio/iio.h> |
| 28 | #include <linux/iio/buffer.h> |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 29 | #include <linux/iio/trigger.h> |
| 30 | #include <linux/iio/trigger_consumer.h> |
Lars-Peter Clausen | 90032e4 | 2012-06-18 18:33:49 +0200 | [diff] [blame] | 31 | #include <linux/iio/triggered_buffer.h> |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 32 | |
| 33 | #include <mach/at91_adc.h> |
| 34 | |
| 35 | #define AT91_ADC_CHAN(st, ch) \ |
| 36 | (st->registers->channel_base + (ch * 4)) |
| 37 | #define at91_adc_readl(st, reg) \ |
| 38 | (readl_relaxed(st->reg_base + reg)) |
| 39 | #define at91_adc_writel(st, reg, val) \ |
| 40 | (writel_relaxed(val, st->reg_base + reg)) |
| 41 | |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 42 | struct at91_adc_caps { |
| 43 | struct at91_adc_reg_desc registers; |
| 44 | }; |
| 45 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 46 | struct at91_adc_state { |
| 47 | struct clk *adc_clk; |
| 48 | u16 *buffer; |
| 49 | unsigned long channels_mask; |
| 50 | struct clk *clk; |
| 51 | bool done; |
| 52 | int irq; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 53 | u16 last_value; |
| 54 | struct mutex lock; |
| 55 | u8 num_channels; |
| 56 | void __iomem *reg_base; |
| 57 | struct at91_adc_reg_desc *registers; |
| 58 | u8 startup_time; |
Jean-Christophe PLAGNIOL-VILLARD | beca9e7 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 59 | u8 sample_hold_time; |
Jean-Christophe PLAGNIOL-VILLARD | e748783 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 60 | bool sleep_mode; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 61 | struct iio_trigger **trig; |
| 62 | struct at91_adc_trigger *trigger_list; |
| 63 | u32 trigger_number; |
| 64 | bool use_external; |
| 65 | u32 vref_mv; |
Ludovic Desroches | 47be16b | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 66 | u32 res; /* resolution used for convertions */ |
| 67 | bool low_res; /* the resolution corresponds to the lowest one */ |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 68 | wait_queue_head_t wq_data_avail; |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 69 | struct at91_adc_caps *caps; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | static irqreturn_t at91_adc_trigger_handler(int irq, void *p) |
| 73 | { |
| 74 | struct iio_poll_func *pf = p; |
| 75 | struct iio_dev *idev = pf->indio_dev; |
| 76 | struct at91_adc_state *st = iio_priv(idev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 77 | int i, j = 0; |
| 78 | |
| 79 | for (i = 0; i < idev->masklength; i++) { |
| 80 | if (!test_bit(i, idev->active_scan_mask)) |
| 81 | continue; |
| 82 | st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, i)); |
| 83 | j++; |
| 84 | } |
| 85 | |
| 86 | if (idev->scan_timestamp) { |
| 87 | s64 *timestamp = (s64 *)((u8 *)st->buffer + |
| 88 | ALIGN(j, sizeof(s64))); |
| 89 | *timestamp = pf->timestamp; |
| 90 | } |
| 91 | |
Lars-Peter Clausen | 8c60c7e | 2013-09-15 17:50:00 +0100 | [diff] [blame] | 92 | iio_push_to_buffers(idev, st->buffer); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 93 | |
| 94 | iio_trigger_notify_done(idev->trig); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 95 | |
| 96 | /* Needed to ACK the DRDY interruption */ |
| 97 | at91_adc_readl(st, AT91_ADC_LCDR); |
| 98 | |
| 99 | enable_irq(st->irq); |
| 100 | |
| 101 | return IRQ_HANDLED; |
| 102 | } |
| 103 | |
| 104 | static irqreturn_t at91_adc_eoc_trigger(int irq, void *private) |
| 105 | { |
| 106 | struct iio_dev *idev = private; |
| 107 | struct at91_adc_state *st = iio_priv(idev); |
| 108 | u32 status = at91_adc_readl(st, st->registers->status_register); |
| 109 | |
| 110 | if (!(status & st->registers->drdy_mask)) |
| 111 | return IRQ_HANDLED; |
| 112 | |
| 113 | if (iio_buffer_enabled(idev)) { |
| 114 | disable_irq_nosync(irq); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 115 | iio_trigger_poll(idev->trig, iio_get_time_ns()); |
| 116 | } else { |
| 117 | st->last_value = at91_adc_readl(st, AT91_ADC_LCDR); |
| 118 | st->done = true; |
| 119 | wake_up_interruptible(&st->wq_data_avail); |
| 120 | } |
| 121 | |
| 122 | return IRQ_HANDLED; |
| 123 | } |
| 124 | |
| 125 | static int at91_adc_channel_init(struct iio_dev *idev) |
| 126 | { |
| 127 | struct at91_adc_state *st = iio_priv(idev); |
| 128 | struct iio_chan_spec *chan_array, *timestamp; |
| 129 | int bit, idx = 0; |
| 130 | |
| 131 | idev->num_channels = bitmap_weight(&st->channels_mask, |
| 132 | st->num_channels) + 1; |
| 133 | |
Axel Lin | 6b3aa31 | 2012-10-29 08:25:00 +0000 | [diff] [blame] | 134 | chan_array = devm_kzalloc(&idev->dev, |
| 135 | ((idev->num_channels + 1) * |
| 136 | sizeof(struct iio_chan_spec)), |
| 137 | GFP_KERNEL); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 138 | |
| 139 | if (!chan_array) |
| 140 | return -ENOMEM; |
| 141 | |
| 142 | for_each_set_bit(bit, &st->channels_mask, st->num_channels) { |
| 143 | struct iio_chan_spec *chan = chan_array + idx; |
| 144 | |
| 145 | chan->type = IIO_VOLTAGE; |
| 146 | chan->indexed = 1; |
| 147 | chan->channel = bit; |
| 148 | chan->scan_index = idx; |
| 149 | chan->scan_type.sign = 'u'; |
Ludovic Desroches | 47be16b | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 150 | chan->scan_type.realbits = st->res; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 151 | chan->scan_type.storagebits = 16; |
Jonathan Cameron | 01bdab6 | 2013-02-27 19:06:10 +0000 | [diff] [blame] | 152 | chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); |
| 153 | chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 154 | idx++; |
| 155 | } |
| 156 | timestamp = chan_array + idx; |
| 157 | |
| 158 | timestamp->type = IIO_TIMESTAMP; |
| 159 | timestamp->channel = -1; |
| 160 | timestamp->scan_index = idx; |
| 161 | timestamp->scan_type.sign = 's'; |
| 162 | timestamp->scan_type.realbits = 64; |
| 163 | timestamp->scan_type.storagebits = 64; |
| 164 | |
| 165 | idev->channels = chan_array; |
| 166 | return idev->num_channels; |
| 167 | } |
| 168 | |
| 169 | static u8 at91_adc_get_trigger_value_by_name(struct iio_dev *idev, |
| 170 | struct at91_adc_trigger *triggers, |
| 171 | const char *trigger_name) |
| 172 | { |
| 173 | struct at91_adc_state *st = iio_priv(idev); |
| 174 | u8 value = 0; |
| 175 | int i; |
| 176 | |
| 177 | for (i = 0; i < st->trigger_number; i++) { |
| 178 | char *name = kasprintf(GFP_KERNEL, |
| 179 | "%s-dev%d-%s", |
| 180 | idev->name, |
| 181 | idev->id, |
| 182 | triggers[i].name); |
| 183 | if (!name) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | if (strcmp(trigger_name, name) == 0) { |
| 187 | value = triggers[i].value; |
| 188 | kfree(name); |
| 189 | break; |
| 190 | } |
| 191 | |
| 192 | kfree(name); |
| 193 | } |
| 194 | |
| 195 | return value; |
| 196 | } |
| 197 | |
| 198 | static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) |
| 199 | { |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 200 | struct iio_dev *idev = iio_trigger_get_drvdata(trig); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 201 | struct at91_adc_state *st = iio_priv(idev); |
| 202 | struct iio_buffer *buffer = idev->buffer; |
| 203 | struct at91_adc_reg_desc *reg = st->registers; |
| 204 | u32 status = at91_adc_readl(st, reg->trigger_register); |
| 205 | u8 value; |
| 206 | u8 bit; |
| 207 | |
| 208 | value = at91_adc_get_trigger_value_by_name(idev, |
| 209 | st->trigger_list, |
| 210 | idev->trig->name); |
| 211 | if (value == 0) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | if (state) { |
| 215 | st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL); |
| 216 | if (st->buffer == NULL) |
| 217 | return -ENOMEM; |
| 218 | |
| 219 | at91_adc_writel(st, reg->trigger_register, |
| 220 | status | value); |
| 221 | |
| 222 | for_each_set_bit(bit, buffer->scan_mask, |
| 223 | st->num_channels) { |
| 224 | struct iio_chan_spec const *chan = idev->channels + bit; |
| 225 | at91_adc_writel(st, AT91_ADC_CHER, |
| 226 | AT91_ADC_CH(chan->channel)); |
| 227 | } |
| 228 | |
| 229 | at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask); |
| 230 | |
| 231 | } else { |
| 232 | at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask); |
| 233 | |
| 234 | at91_adc_writel(st, reg->trigger_register, |
| 235 | status & ~value); |
| 236 | |
| 237 | for_each_set_bit(bit, buffer->scan_mask, |
| 238 | st->num_channels) { |
| 239 | struct iio_chan_spec const *chan = idev->channels + bit; |
| 240 | at91_adc_writel(st, AT91_ADC_CHDR, |
| 241 | AT91_ADC_CH(chan->channel)); |
| 242 | } |
| 243 | kfree(st->buffer); |
| 244 | } |
| 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static const struct iio_trigger_ops at91_adc_trigger_ops = { |
| 250 | .owner = THIS_MODULE, |
| 251 | .set_trigger_state = &at91_adc_configure_trigger, |
| 252 | }; |
| 253 | |
| 254 | static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev, |
| 255 | struct at91_adc_trigger *trigger) |
| 256 | { |
| 257 | struct iio_trigger *trig; |
| 258 | int ret; |
| 259 | |
| 260 | trig = iio_trigger_alloc("%s-dev%d-%s", idev->name, |
| 261 | idev->id, trigger->name); |
| 262 | if (trig == NULL) |
| 263 | return NULL; |
| 264 | |
| 265 | trig->dev.parent = idev->dev.parent; |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 266 | iio_trigger_set_drvdata(trig, idev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 267 | trig->ops = &at91_adc_trigger_ops; |
| 268 | |
| 269 | ret = iio_trigger_register(trig); |
| 270 | if (ret) |
| 271 | return NULL; |
| 272 | |
| 273 | return trig; |
| 274 | } |
| 275 | |
| 276 | static int at91_adc_trigger_init(struct iio_dev *idev) |
| 277 | { |
| 278 | struct at91_adc_state *st = iio_priv(idev); |
| 279 | int i, ret; |
| 280 | |
Axel Lin | 6b3aa31 | 2012-10-29 08:25:00 +0000 | [diff] [blame] | 281 | st->trig = devm_kzalloc(&idev->dev, |
Thomas Meyer | 4287723 | 2013-09-19 22:42:00 +0100 | [diff] [blame^] | 282 | st->trigger_number * sizeof(*st->trig), |
Axel Lin | 6b3aa31 | 2012-10-29 08:25:00 +0000 | [diff] [blame] | 283 | GFP_KERNEL); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 284 | |
| 285 | if (st->trig == NULL) { |
| 286 | ret = -ENOMEM; |
| 287 | goto error_ret; |
| 288 | } |
| 289 | |
| 290 | for (i = 0; i < st->trigger_number; i++) { |
| 291 | if (st->trigger_list[i].is_external && !(st->use_external)) |
| 292 | continue; |
| 293 | |
| 294 | st->trig[i] = at91_adc_allocate_trigger(idev, |
| 295 | st->trigger_list + i); |
| 296 | if (st->trig[i] == NULL) { |
| 297 | dev_err(&idev->dev, |
| 298 | "Could not allocate trigger %d\n", i); |
| 299 | ret = -ENOMEM; |
| 300 | goto error_trigger; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | return 0; |
| 305 | |
| 306 | error_trigger: |
| 307 | for (i--; i >= 0; i--) { |
| 308 | iio_trigger_unregister(st->trig[i]); |
| 309 | iio_trigger_free(st->trig[i]); |
| 310 | } |
| 311 | error_ret: |
| 312 | return ret; |
| 313 | } |
| 314 | |
| 315 | static void at91_adc_trigger_remove(struct iio_dev *idev) |
| 316 | { |
| 317 | struct at91_adc_state *st = iio_priv(idev); |
| 318 | int i; |
| 319 | |
| 320 | for (i = 0; i < st->trigger_number; i++) { |
| 321 | iio_trigger_unregister(st->trig[i]); |
| 322 | iio_trigger_free(st->trig[i]); |
| 323 | } |
| 324 | } |
| 325 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 326 | static int at91_adc_buffer_init(struct iio_dev *idev) |
| 327 | { |
Lars-Peter Clausen | 90032e4 | 2012-06-18 18:33:49 +0200 | [diff] [blame] | 328 | return iio_triggered_buffer_setup(idev, &iio_pollfunc_store_time, |
| 329 | &at91_adc_trigger_handler, NULL); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | static void at91_adc_buffer_remove(struct iio_dev *idev) |
| 333 | { |
Lars-Peter Clausen | 90032e4 | 2012-06-18 18:33:49 +0200 | [diff] [blame] | 334 | iio_triggered_buffer_cleanup(idev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | static int at91_adc_read_raw(struct iio_dev *idev, |
| 338 | struct iio_chan_spec const *chan, |
| 339 | int *val, int *val2, long mask) |
| 340 | { |
| 341 | struct at91_adc_state *st = iio_priv(idev); |
| 342 | int ret; |
| 343 | |
| 344 | switch (mask) { |
| 345 | case IIO_CHAN_INFO_RAW: |
| 346 | mutex_lock(&st->lock); |
| 347 | |
| 348 | at91_adc_writel(st, AT91_ADC_CHER, |
| 349 | AT91_ADC_CH(chan->channel)); |
| 350 | at91_adc_writel(st, AT91_ADC_IER, st->registers->drdy_mask); |
| 351 | at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); |
| 352 | |
| 353 | ret = wait_event_interruptible_timeout(st->wq_data_avail, |
| 354 | st->done, |
| 355 | msecs_to_jiffies(1000)); |
| 356 | if (ret == 0) |
Lars-Peter Clausen | 90e6dc7 | 2012-06-26 10:43:05 +0200 | [diff] [blame] | 357 | ret = -ETIMEDOUT; |
| 358 | if (ret < 0) { |
| 359 | mutex_unlock(&st->lock); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 360 | return ret; |
Lars-Peter Clausen | 90e6dc7 | 2012-06-26 10:43:05 +0200 | [diff] [blame] | 361 | } |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 362 | |
| 363 | *val = st->last_value; |
| 364 | |
| 365 | at91_adc_writel(st, AT91_ADC_CHDR, |
| 366 | AT91_ADC_CH(chan->channel)); |
| 367 | at91_adc_writel(st, AT91_ADC_IDR, st->registers->drdy_mask); |
| 368 | |
| 369 | st->last_value = 0; |
| 370 | st->done = false; |
| 371 | mutex_unlock(&st->lock); |
| 372 | return IIO_VAL_INT; |
| 373 | |
| 374 | case IIO_CHAN_INFO_SCALE: |
| 375 | *val = (st->vref_mv * 1000) >> chan->scan_type.realbits; |
| 376 | *val2 = 0; |
| 377 | return IIO_VAL_INT_PLUS_MICRO; |
| 378 | default: |
| 379 | break; |
| 380 | } |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
Ludovic Desroches | 47be16b | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 384 | static int at91_adc_of_get_resolution(struct at91_adc_state *st, |
| 385 | struct platform_device *pdev) |
| 386 | { |
| 387 | struct iio_dev *idev = iio_priv_to_dev(st); |
| 388 | struct device_node *np = pdev->dev.of_node; |
| 389 | int count, i, ret = 0; |
| 390 | char *res_name, *s; |
| 391 | u32 *resolutions; |
| 392 | |
| 393 | count = of_property_count_strings(np, "atmel,adc-res-names"); |
| 394 | if (count < 2) { |
| 395 | dev_err(&idev->dev, "You must specified at least two resolution names for " |
| 396 | "adc-res-names property in the DT\n"); |
| 397 | return count; |
| 398 | } |
| 399 | |
| 400 | resolutions = kmalloc(count * sizeof(*resolutions), GFP_KERNEL); |
| 401 | if (!resolutions) |
| 402 | return -ENOMEM; |
| 403 | |
| 404 | if (of_property_read_u32_array(np, "atmel,adc-res", resolutions, count)) { |
| 405 | dev_err(&idev->dev, "Missing adc-res property in the DT.\n"); |
| 406 | ret = -ENODEV; |
| 407 | goto ret; |
| 408 | } |
| 409 | |
| 410 | if (of_property_read_string(np, "atmel,adc-use-res", (const char **)&res_name)) |
| 411 | res_name = "highres"; |
| 412 | |
| 413 | for (i = 0; i < count; i++) { |
| 414 | if (of_property_read_string_index(np, "atmel,adc-res-names", i, (const char **)&s)) |
| 415 | continue; |
| 416 | |
| 417 | if (strcmp(res_name, s)) |
| 418 | continue; |
| 419 | |
| 420 | st->res = resolutions[i]; |
| 421 | if (!strcmp(res_name, "lowres")) |
| 422 | st->low_res = true; |
| 423 | else |
| 424 | st->low_res = false; |
| 425 | |
| 426 | dev_info(&idev->dev, "Resolution used: %u bits\n", st->res); |
| 427 | goto ret; |
| 428 | } |
| 429 | |
| 430 | dev_err(&idev->dev, "There is no resolution for %s\n", res_name); |
| 431 | |
| 432 | ret: |
| 433 | kfree(resolutions); |
| 434 | return ret; |
| 435 | } |
| 436 | |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 437 | static const struct of_device_id at91_adc_dt_ids[]; |
| 438 | |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 439 | static int at91_adc_probe_dt(struct at91_adc_state *st, |
| 440 | struct platform_device *pdev) |
| 441 | { |
| 442 | struct iio_dev *idev = iio_priv_to_dev(st); |
| 443 | struct device_node *node = pdev->dev.of_node; |
| 444 | struct device_node *trig_node; |
| 445 | int i = 0, ret; |
| 446 | u32 prop; |
| 447 | |
| 448 | if (!node) |
| 449 | return -EINVAL; |
| 450 | |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 451 | st->caps = (struct at91_adc_caps *) |
| 452 | of_match_device(at91_adc_dt_ids, &pdev->dev)->data; |
| 453 | |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 454 | st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers"); |
| 455 | |
| 456 | if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) { |
| 457 | dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n"); |
| 458 | ret = -EINVAL; |
| 459 | goto error_ret; |
| 460 | } |
| 461 | st->channels_mask = prop; |
| 462 | |
| 463 | if (of_property_read_u32(node, "atmel,adc-num-channels", &prop)) { |
| 464 | dev_err(&idev->dev, "Missing adc-num-channels property in the DT.\n"); |
| 465 | ret = -EINVAL; |
| 466 | goto error_ret; |
| 467 | } |
| 468 | st->num_channels = prop; |
| 469 | |
Jean-Christophe PLAGNIOL-VILLARD | e748783 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 470 | st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode"); |
| 471 | |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 472 | if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) { |
| 473 | dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n"); |
| 474 | ret = -EINVAL; |
| 475 | goto error_ret; |
| 476 | } |
| 477 | st->startup_time = prop; |
| 478 | |
Jean-Christophe PLAGNIOL-VILLARD | beca9e7 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 479 | prop = 0; |
| 480 | of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop); |
| 481 | st->sample_hold_time = prop; |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 482 | |
| 483 | if (of_property_read_u32(node, "atmel,adc-vref", &prop)) { |
| 484 | dev_err(&idev->dev, "Missing adc-vref property in the DT.\n"); |
| 485 | ret = -EINVAL; |
| 486 | goto error_ret; |
| 487 | } |
| 488 | st->vref_mv = prop; |
| 489 | |
Ludovic Desroches | 47be16b | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 490 | ret = at91_adc_of_get_resolution(st, pdev); |
| 491 | if (ret) |
| 492 | goto error_ret; |
| 493 | |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 494 | st->registers = &st->caps->registers; |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 495 | st->trigger_number = of_get_child_count(node); |
Axel Lin | 6b3aa31 | 2012-10-29 08:25:00 +0000 | [diff] [blame] | 496 | st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number * |
| 497 | sizeof(struct at91_adc_trigger), |
| 498 | GFP_KERNEL); |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 499 | if (!st->trigger_list) { |
| 500 | dev_err(&idev->dev, "Could not allocate trigger list memory.\n"); |
| 501 | ret = -ENOMEM; |
| 502 | goto error_ret; |
| 503 | } |
| 504 | |
| 505 | for_each_child_of_node(node, trig_node) { |
| 506 | struct at91_adc_trigger *trig = st->trigger_list + i; |
| 507 | const char *name; |
| 508 | |
| 509 | if (of_property_read_string(trig_node, "trigger-name", &name)) { |
| 510 | dev_err(&idev->dev, "Missing trigger-name property in the DT.\n"); |
| 511 | ret = -EINVAL; |
| 512 | goto error_ret; |
| 513 | } |
| 514 | trig->name = name; |
| 515 | |
| 516 | if (of_property_read_u32(trig_node, "trigger-value", &prop)) { |
| 517 | dev_err(&idev->dev, "Missing trigger-value property in the DT.\n"); |
| 518 | ret = -EINVAL; |
| 519 | goto error_ret; |
| 520 | } |
| 521 | trig->value = prop; |
| 522 | trig->is_external = of_property_read_bool(trig_node, "trigger-external"); |
| 523 | i++; |
| 524 | } |
| 525 | |
| 526 | return 0; |
| 527 | |
| 528 | error_ret: |
| 529 | return ret; |
| 530 | } |
| 531 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 532 | static int at91_adc_probe_pdata(struct at91_adc_state *st, |
| 533 | struct platform_device *pdev) |
| 534 | { |
| 535 | struct at91_adc_data *pdata = pdev->dev.platform_data; |
| 536 | |
| 537 | if (!pdata) |
| 538 | return -EINVAL; |
| 539 | |
| 540 | st->use_external = pdata->use_external_triggers; |
| 541 | st->vref_mv = pdata->vref; |
| 542 | st->channels_mask = pdata->channels_used; |
| 543 | st->num_channels = pdata->num_channels; |
| 544 | st->startup_time = pdata->startup_time; |
| 545 | st->trigger_number = pdata->trigger_number; |
| 546 | st->trigger_list = pdata->trigger_list; |
| 547 | st->registers = pdata->registers; |
| 548 | |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | static const struct iio_info at91_adc_info = { |
| 553 | .driver_module = THIS_MODULE, |
| 554 | .read_raw = &at91_adc_read_raw, |
| 555 | }; |
| 556 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 557 | static int at91_adc_probe(struct platform_device *pdev) |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 558 | { |
Jean-Christophe PLAGNIOL-VILLARD | beca9e7 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 559 | unsigned int prsc, mstrclk, ticks, adc_clk, shtim; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 560 | int ret; |
| 561 | struct iio_dev *idev; |
| 562 | struct at91_adc_state *st; |
| 563 | struct resource *res; |
Jean-Christophe PLAGNIOL-VILLARD | e748783 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 564 | u32 reg; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 565 | |
Sachin Kamat | f883753 | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 566 | idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state)); |
| 567 | if (!idev) |
| 568 | return -ENOMEM; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 569 | |
| 570 | st = iio_priv(idev); |
| 571 | |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 572 | if (pdev->dev.of_node) |
| 573 | ret = at91_adc_probe_dt(st, pdev); |
| 574 | else |
| 575 | ret = at91_adc_probe_pdata(st, pdev); |
| 576 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 577 | if (ret) { |
| 578 | dev_err(&pdev->dev, "No platform data available.\n"); |
Sachin Kamat | f883753 | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 579 | return -EINVAL; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 580 | } |
| 581 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 582 | platform_set_drvdata(pdev, idev); |
| 583 | |
| 584 | idev->dev.parent = &pdev->dev; |
| 585 | idev->name = dev_name(&pdev->dev); |
| 586 | idev->modes = INDIO_DIRECT_MODE; |
| 587 | idev->info = &at91_adc_info; |
| 588 | |
| 589 | st->irq = platform_get_irq(pdev, 0); |
| 590 | if (st->irq < 0) { |
| 591 | dev_err(&pdev->dev, "No IRQ ID is designated\n"); |
Sachin Kamat | f883753 | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 592 | return -ENODEV; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 593 | } |
| 594 | |
Julia Lawall | 390d75c | 2012-07-31 14:09:00 +0100 | [diff] [blame] | 595 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 596 | |
Thierry Reding | 5fd9846 | 2013-01-21 11:09:04 +0100 | [diff] [blame] | 597 | st->reg_base = devm_ioremap_resource(&pdev->dev, res); |
| 598 | if (IS_ERR(st->reg_base)) { |
Sachin Kamat | f883753 | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 599 | return PTR_ERR(st->reg_base); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Disable all IRQs before setting up the handler |
| 604 | */ |
| 605 | at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST); |
| 606 | at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF); |
| 607 | ret = request_irq(st->irq, |
| 608 | at91_adc_eoc_trigger, |
| 609 | 0, |
| 610 | pdev->dev.driver->name, |
| 611 | idev); |
| 612 | if (ret) { |
| 613 | dev_err(&pdev->dev, "Failed to allocate IRQ.\n"); |
Sachin Kamat | f883753 | 2013-07-22 12:02:00 +0100 | [diff] [blame] | 614 | return ret; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 615 | } |
| 616 | |
Julia Lawall | 390d75c | 2012-07-31 14:09:00 +0100 | [diff] [blame] | 617 | st->clk = devm_clk_get(&pdev->dev, "adc_clk"); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 618 | if (IS_ERR(st->clk)) { |
| 619 | dev_err(&pdev->dev, "Failed to get the clock.\n"); |
| 620 | ret = PTR_ERR(st->clk); |
| 621 | goto error_free_irq; |
| 622 | } |
| 623 | |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 624 | ret = clk_prepare_enable(st->clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 625 | if (ret) { |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 626 | dev_err(&pdev->dev, |
| 627 | "Could not prepare or enable the clock.\n"); |
Julia Lawall | 390d75c | 2012-07-31 14:09:00 +0100 | [diff] [blame] | 628 | goto error_free_irq; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 629 | } |
| 630 | |
Julia Lawall | 390d75c | 2012-07-31 14:09:00 +0100 | [diff] [blame] | 631 | st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk"); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 632 | if (IS_ERR(st->adc_clk)) { |
| 633 | dev_err(&pdev->dev, "Failed to get the ADC clock.\n"); |
Julia Lawall | f755bbb | 2012-08-25 21:57:09 +0200 | [diff] [blame] | 634 | ret = PTR_ERR(st->adc_clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 635 | goto error_disable_clk; |
| 636 | } |
| 637 | |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 638 | ret = clk_prepare_enable(st->adc_clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 639 | if (ret) { |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 640 | dev_err(&pdev->dev, |
| 641 | "Could not prepare or enable the ADC clock.\n"); |
Julia Lawall | 390d75c | 2012-07-31 14:09:00 +0100 | [diff] [blame] | 642 | goto error_disable_clk; |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 643 | } |
| 644 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 645 | /* |
| 646 | * Prescaler rate computation using the formula from the Atmel's |
| 647 | * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being |
| 648 | * specified by the electrical characteristics of the board. |
| 649 | */ |
| 650 | mstrclk = clk_get_rate(st->clk); |
| 651 | adc_clk = clk_get_rate(st->adc_clk); |
| 652 | prsc = (mstrclk / (2 * adc_clk)) - 1; |
| 653 | |
| 654 | if (!st->startup_time) { |
| 655 | dev_err(&pdev->dev, "No startup time available.\n"); |
| 656 | ret = -EINVAL; |
| 657 | goto error_disable_adc_clk; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Number of ticks needed to cover the startup time of the ADC as |
| 662 | * defined in the electrical characteristics of the board, divided by 8. |
| 663 | * The formula thus is : Startup Time = (ticks + 1) * 8 / ADC Clock |
| 664 | */ |
| 665 | ticks = round_up((st->startup_time * adc_clk / |
| 666 | 1000000) - 1, 8) / 8; |
Jean-Christophe PLAGNIOL-VILLARD | beca9e7 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 667 | /* |
| 668 | * a minimal Sample and Hold Time is necessary for the ADC to guarantee |
| 669 | * the best converted final value between two channels selection |
| 670 | * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock |
| 671 | */ |
| 672 | shtim = round_up((st->sample_hold_time * adc_clk / |
| 673 | 1000000) - 1, 1); |
| 674 | |
Josh Wu | 9120c0b | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 675 | reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask; |
| 676 | reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask; |
Ludovic Desroches | 47be16b | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 677 | if (st->low_res) |
Jean-Christophe PLAGNIOL-VILLARD | e748783 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 678 | reg |= AT91_ADC_LOWRES; |
| 679 | if (st->sleep_mode) |
| 680 | reg |= AT91_ADC_SLEEP; |
Jean-Christophe PLAGNIOL-VILLARD | beca9e7 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 681 | reg |= AT91_ADC_SHTIM_(shtim) & AT91_ADC_SHTIM; |
Jean-Christophe PLAGNIOL-VILLARD | e748783 | 2013-03-29 14:54:00 +0000 | [diff] [blame] | 682 | at91_adc_writel(st, AT91_ADC_MR, reg); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 683 | |
| 684 | /* Setup the ADC channels available on the board */ |
| 685 | ret = at91_adc_channel_init(idev); |
| 686 | if (ret < 0) { |
| 687 | dev_err(&pdev->dev, "Couldn't initialize the channels.\n"); |
| 688 | goto error_disable_adc_clk; |
| 689 | } |
| 690 | |
| 691 | init_waitqueue_head(&st->wq_data_avail); |
| 692 | mutex_init(&st->lock); |
| 693 | |
| 694 | ret = at91_adc_buffer_init(idev); |
| 695 | if (ret < 0) { |
| 696 | dev_err(&pdev->dev, "Couldn't initialize the buffer.\n"); |
| 697 | goto error_disable_adc_clk; |
| 698 | } |
| 699 | |
| 700 | ret = at91_adc_trigger_init(idev); |
| 701 | if (ret < 0) { |
| 702 | dev_err(&pdev->dev, "Couldn't setup the triggers.\n"); |
| 703 | goto error_unregister_buffer; |
| 704 | } |
| 705 | |
| 706 | ret = iio_device_register(idev); |
| 707 | if (ret < 0) { |
| 708 | dev_err(&pdev->dev, "Couldn't register the device.\n"); |
| 709 | goto error_remove_triggers; |
| 710 | } |
| 711 | |
| 712 | return 0; |
| 713 | |
| 714 | error_remove_triggers: |
| 715 | at91_adc_trigger_remove(idev); |
| 716 | error_unregister_buffer: |
| 717 | at91_adc_buffer_remove(idev); |
| 718 | error_disable_adc_clk: |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 719 | clk_disable_unprepare(st->adc_clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 720 | error_disable_clk: |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 721 | clk_disable_unprepare(st->clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 722 | error_free_irq: |
| 723 | free_irq(st->irq, idev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 724 | return ret; |
| 725 | } |
| 726 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 727 | static int at91_adc_remove(struct platform_device *pdev) |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 728 | { |
| 729 | struct iio_dev *idev = platform_get_drvdata(pdev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 730 | struct at91_adc_state *st = iio_priv(idev); |
| 731 | |
| 732 | iio_device_unregister(idev); |
| 733 | at91_adc_trigger_remove(idev); |
| 734 | at91_adc_buffer_remove(idev); |
| 735 | clk_disable_unprepare(st->adc_clk); |
Julia Lawall | 00062a9c | 2012-08-26 17:00:00 +0100 | [diff] [blame] | 736 | clk_disable_unprepare(st->clk); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 737 | free_irq(st->irq, idev); |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 738 | |
| 739 | return 0; |
| 740 | } |
| 741 | |
Sachin Kamat | 00738ff | 2013-05-23 06:26:00 +0100 | [diff] [blame] | 742 | #ifdef CONFIG_OF |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 743 | static struct at91_adc_caps at91sam9260_caps = { |
| 744 | .registers = { |
| 745 | .channel_base = AT91_ADC_CHR(0), |
| 746 | .drdy_mask = AT91_ADC_DRDY, |
| 747 | .status_register = AT91_ADC_SR, |
| 748 | .trigger_register = AT91_ADC_TRGR_9260, |
Josh Wu | 9120c0b | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 749 | .mr_prescal_mask = AT91_ADC_PRESCAL_9260, |
| 750 | .mr_startup_mask = AT91_ADC_STARTUP_9260, |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 751 | }, |
| 752 | }; |
| 753 | |
| 754 | static struct at91_adc_caps at91sam9g45_caps = { |
| 755 | .registers = { |
| 756 | .channel_base = AT91_ADC_CHR(0), |
| 757 | .drdy_mask = AT91_ADC_DRDY, |
| 758 | .status_register = AT91_ADC_SR, |
| 759 | .trigger_register = AT91_ADC_TRGR_9G45, |
Josh Wu | 9120c0b | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 760 | .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, |
| 761 | .mr_startup_mask = AT91_ADC_STARTUP_9G45, |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 762 | }, |
| 763 | }; |
| 764 | |
| 765 | static struct at91_adc_caps at91sam9x5_caps = { |
| 766 | .registers = { |
| 767 | .channel_base = AT91_ADC_CDR0_9X5, |
| 768 | .drdy_mask = AT91_ADC_SR_DRDY_9X5, |
| 769 | .status_register = AT91_ADC_SR_9X5, |
| 770 | .trigger_register = AT91_ADC_TRGR_9X5, |
Josh Wu | 9120c0b | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 771 | /* prescal mask is same as 9G45 */ |
| 772 | .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, |
| 773 | .mr_startup_mask = AT91_ADC_STARTUP_9X5, |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 774 | }, |
| 775 | }; |
| 776 | |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 777 | static const struct of_device_id at91_adc_dt_ids[] = { |
Josh Wu | e1811f9 | 2013-08-27 12:28:00 +0100 | [diff] [blame] | 778 | { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps }, |
| 779 | { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps }, |
| 780 | { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps }, |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 781 | {}, |
| 782 | }; |
| 783 | MODULE_DEVICE_TABLE(of, at91_adc_dt_ids); |
Sachin Kamat | 00738ff | 2013-05-23 06:26:00 +0100 | [diff] [blame] | 784 | #endif |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 785 | |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 786 | static struct platform_driver at91_adc_driver = { |
| 787 | .probe = at91_adc_probe, |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 788 | .remove = at91_adc_remove, |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 789 | .driver = { |
| 790 | .name = "at91_adc", |
Maxime Ripard | e364185 | 2012-05-11 15:35:37 +0200 | [diff] [blame] | 791 | .of_match_table = of_match_ptr(at91_adc_dt_ids), |
Maxime Ripard | 0e589d5 | 2012-05-11 15:35:33 +0200 | [diff] [blame] | 792 | }, |
| 793 | }; |
| 794 | |
| 795 | module_platform_driver(at91_adc_driver); |
| 796 | |
| 797 | MODULE_LICENSE("GPL"); |
| 798 | MODULE_DESCRIPTION("Atmel AT91 ADC Driver"); |
| 799 | MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); |