Commit | Line | Data |
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bc2c90c9 MV |
1 | /* |
2 | * Freescale i.MX28 LRADC driver | |
3 | * | |
4 | * Copyright (c) 2012 DENX Software Engineering, GmbH. | |
5 | * Marek Vasut <marex@denx.de> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/interrupt.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/wait.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/stmp_device.h> | |
33 | #include <linux/bitops.h> | |
34 | #include <linux/completion.h> | |
35 | ||
36 | #include <mach/mxs.h> | |
37 | #include <mach/common.h> | |
38 | ||
39 | #include <linux/iio/iio.h> | |
40 | #include <linux/iio/buffer.h> | |
41 | #include <linux/iio/trigger.h> | |
42 | #include <linux/iio/trigger_consumer.h> | |
43 | #include <linux/iio/triggered_buffer.h> | |
44 | ||
45 | #define DRIVER_NAME "mxs-lradc" | |
46 | ||
47 | #define LRADC_MAX_DELAY_CHANS 4 | |
48 | #define LRADC_MAX_MAPPED_CHANS 8 | |
49 | #define LRADC_MAX_TOTAL_CHANS 16 | |
50 | ||
51 | #define LRADC_DELAY_TIMER_HZ 2000 | |
52 | ||
53 | /* | |
54 | * Make this runtime configurable if necessary. Currently, if the buffered mode | |
55 | * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before | |
56 | * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000) | |
57 | * seconds. The result is that the samples arrive every 500mS. | |
58 | */ | |
59 | #define LRADC_DELAY_TIMER_PER 200 | |
60 | #define LRADC_DELAY_TIMER_LOOP 5 | |
61 | ||
62 | static const char * const mxs_lradc_irq_name[] = { | |
63 | "mxs-lradc-touchscreen", | |
64 | "mxs-lradc-thresh0", | |
65 | "mxs-lradc-thresh1", | |
66 | "mxs-lradc-channel0", | |
67 | "mxs-lradc-channel1", | |
68 | "mxs-lradc-channel2", | |
69 | "mxs-lradc-channel3", | |
70 | "mxs-lradc-channel4", | |
71 | "mxs-lradc-channel5", | |
72 | "mxs-lradc-channel6", | |
73 | "mxs-lradc-channel7", | |
74 | "mxs-lradc-button0", | |
75 | "mxs-lradc-button1", | |
76 | }; | |
77 | ||
78 | struct mxs_lradc_chan { | |
79 | uint8_t slot; | |
80 | uint8_t flags; | |
81 | }; | |
82 | ||
83 | struct mxs_lradc { | |
84 | struct device *dev; | |
85 | void __iomem *base; | |
86 | int irq[13]; | |
87 | ||
88 | uint32_t *buffer; | |
89 | struct iio_trigger *trig; | |
90 | ||
91 | struct mutex lock; | |
92 | ||
93 | uint8_t enable; | |
94 | ||
95 | struct completion completion; | |
96 | }; | |
97 | ||
98 | #define LRADC_CTRL0 0x00 | |
99 | #define LRADC_CTRL0_TOUCH_DETECT_ENABLE (1 << 23) | |
100 | #define LRADC_CTRL0_TOUCH_SCREEN_TYPE (1 << 22) | |
101 | ||
102 | #define LRADC_CTRL1 0x10 | |
103 | #define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n)) | |
104 | #define LRADC_CTRL1_LRADC_IRQ_MASK 0x1fff | |
105 | #define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) | |
106 | #define LRADC_CTRL1_LRADC_IRQ_EN_MASK (0x1fff << 16) | |
107 | ||
108 | #define LRADC_CTRL2 0x20 | |
109 | #define LRADC_CTRL2_TEMPSENSE_PWD (1 << 15) | |
110 | ||
111 | #define LRADC_CH(n) (0x50 + (0x10 * (n))) | |
112 | #define LRADC_CH_ACCUMULATE (1 << 29) | |
113 | #define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) | |
114 | #define LRADC_CH_NUM_SAMPLES_OFFSET 24 | |
115 | #define LRADC_CH_VALUE_MASK 0x3ffff | |
116 | #define LRADC_CH_VALUE_OFFSET 0 | |
117 | ||
118 | #define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) | |
119 | #define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xff << 24) | |
120 | #define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 | |
121 | #define LRADC_DELAY_KICK (1 << 20) | |
122 | #define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) | |
123 | #define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 | |
124 | #define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11) | |
125 | #define LRADC_DELAY_LOOP_COUNT_OFFSET 11 | |
126 | #define LRADC_DELAY_DELAY_MASK 0x7ff | |
127 | #define LRADC_DELAY_DELAY_OFFSET 0 | |
128 | ||
129 | #define LRADC_CTRL4 0x140 | |
130 | #define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4)) | |
131 | #define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4) | |
132 | ||
133 | /* | |
134 | * Raw I/O operations | |
135 | */ | |
136 | static int mxs_lradc_read_raw(struct iio_dev *iio_dev, | |
137 | const struct iio_chan_spec *chan, | |
138 | int *val, int *val2, long m) | |
139 | { | |
140 | struct mxs_lradc *lradc = iio_priv(iio_dev); | |
141 | int ret; | |
142 | ||
143 | if (m != IIO_CHAN_INFO_RAW) | |
144 | return -EINVAL; | |
145 | ||
146 | /* Check for invalid channel */ | |
147 | if (chan->channel > LRADC_MAX_TOTAL_CHANS) | |
148 | return -EINVAL; | |
149 | ||
150 | /* | |
151 | * See if there is no buffered operation in progess. If there is, simply | |
152 | * bail out. This can be improved to support both buffered and raw IO at | |
153 | * the same time, yet the code becomes horribly complicated. Therefore I | |
154 | * applied KISS principle here. | |
155 | */ | |
156 | ret = mutex_trylock(&lradc->lock); | |
157 | if (!ret) | |
158 | return -EBUSY; | |
159 | ||
160 | INIT_COMPLETION(lradc->completion); | |
161 | ||
162 | /* | |
163 | * No buffered operation in progress, map the channel and trigger it. | |
164 | * Virtual channel 0 is always used here as the others are always not | |
165 | * used if doing raw sampling. | |
166 | */ | |
167 | writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, | |
168 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
169 | writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
170 | ||
171 | writel(chan->channel, lradc->base + LRADC_CTRL4); | |
172 | writel(0, lradc->base + LRADC_CH(0)); | |
173 | ||
174 | /* Enable the IRQ and start sampling the channel. */ | |
175 | writel(LRADC_CTRL1_LRADC_IRQ_EN(0), | |
176 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); | |
177 | writel(1 << 0, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); | |
178 | ||
179 | /* Wait for completion on the channel, 1 second max. */ | |
180 | ret = wait_for_completion_killable_timeout(&lradc->completion, HZ); | |
181 | if (!ret) | |
182 | ret = -ETIMEDOUT; | |
183 | if (ret < 0) | |
184 | goto err; | |
185 | ||
186 | /* Read the data. */ | |
187 | *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK; | |
188 | ret = IIO_VAL_INT; | |
189 | ||
190 | err: | |
191 | writel(LRADC_CTRL1_LRADC_IRQ_EN(0), | |
192 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
193 | ||
194 | mutex_unlock(&lradc->lock); | |
195 | ||
196 | return ret; | |
197 | } | |
198 | ||
199 | static const struct iio_info mxs_lradc_iio_info = { | |
200 | .driver_module = THIS_MODULE, | |
201 | .read_raw = mxs_lradc_read_raw, | |
202 | }; | |
203 | ||
204 | /* | |
205 | * IRQ Handling | |
206 | */ | |
207 | static irqreturn_t mxs_lradc_handle_irq(int irq, void *data) | |
208 | { | |
209 | struct iio_dev *iio = data; | |
210 | struct mxs_lradc *lradc = iio_priv(iio); | |
211 | unsigned long reg = readl(lradc->base + LRADC_CTRL1); | |
212 | ||
213 | if (!(reg & LRADC_CTRL1_LRADC_IRQ_MASK)) | |
214 | return IRQ_NONE; | |
215 | ||
216 | /* | |
217 | * Touchscreen IRQ handling code shall probably have priority | |
218 | * and therefore shall be placed here. | |
219 | */ | |
220 | ||
221 | if (iio_buffer_enabled(iio)) | |
222 | iio_trigger_poll(iio->trig, iio_get_time_ns()); | |
223 | else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) | |
224 | complete(&lradc->completion); | |
225 | ||
226 | writel(reg & LRADC_CTRL1_LRADC_IRQ_MASK, | |
227 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
228 | ||
229 | return IRQ_HANDLED; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Trigger handling | |
234 | */ | |
235 | static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p) | |
236 | { | |
237 | struct iio_poll_func *pf = p; | |
238 | struct iio_dev *iio = pf->indio_dev; | |
239 | struct mxs_lradc *lradc = iio_priv(iio); | |
bc2c90c9 MV |
240 | const uint32_t chan_value = LRADC_CH_ACCUMULATE | |
241 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); | |
7b7a4efe | 242 | unsigned int i, j = 0; |
bc2c90c9 MV |
243 | |
244 | for_each_set_bit(i, iio->active_scan_mask, iio->masklength) { | |
245 | lradc->buffer[j] = readl(lradc->base + LRADC_CH(j)); | |
246 | writel(chan_value, lradc->base + LRADC_CH(j)); | |
247 | lradc->buffer[j] &= LRADC_CH_VALUE_MASK; | |
248 | lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP; | |
249 | j++; | |
250 | } | |
251 | ||
252 | if (iio->scan_timestamp) { | |
253 | s64 *timestamp = (s64 *)((u8 *)lradc->buffer + | |
254 | ALIGN(j, sizeof(s64))); | |
255 | *timestamp = pf->timestamp; | |
256 | } | |
257 | ||
84b36ce5 | 258 | iio_push_to_buffers(iio, (u8 *)lradc->buffer); |
bc2c90c9 MV |
259 | |
260 | iio_trigger_notify_done(iio->trig); | |
261 | ||
262 | return IRQ_HANDLED; | |
263 | } | |
264 | ||
265 | static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state) | |
266 | { | |
267 | struct iio_dev *iio = trig->private_data; | |
268 | struct mxs_lradc *lradc = iio_priv(iio); | |
269 | const uint32_t st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR; | |
270 | ||
271 | writel(LRADC_DELAY_KICK, lradc->base + LRADC_DELAY(0) + st); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static const struct iio_trigger_ops mxs_lradc_trigger_ops = { | |
277 | .owner = THIS_MODULE, | |
278 | .set_trigger_state = &mxs_lradc_configure_trigger, | |
279 | }; | |
280 | ||
281 | static int mxs_lradc_trigger_init(struct iio_dev *iio) | |
282 | { | |
283 | int ret; | |
284 | struct iio_trigger *trig; | |
285 | ||
286 | trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id); | |
287 | if (trig == NULL) | |
288 | return -ENOMEM; | |
289 | ||
290 | trig->dev.parent = iio->dev.parent; | |
291 | trig->private_data = iio; | |
292 | trig->ops = &mxs_lradc_trigger_ops; | |
293 | ||
294 | ret = iio_trigger_register(trig); | |
295 | if (ret) { | |
296 | iio_trigger_free(trig); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | iio->trig = trig; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static void mxs_lradc_trigger_remove(struct iio_dev *iio) | |
306 | { | |
307 | iio_trigger_unregister(iio->trig); | |
308 | iio_trigger_free(iio->trig); | |
309 | } | |
310 | ||
311 | static int mxs_lradc_buffer_preenable(struct iio_dev *iio) | |
312 | { | |
313 | struct mxs_lradc *lradc = iio_priv(iio); | |
314 | struct iio_buffer *buffer = iio->buffer; | |
315 | int ret = 0, chan, ofs = 0, enable = 0; | |
316 | uint32_t ctrl4 = 0; | |
317 | uint32_t ctrl1_irq = 0; | |
318 | const uint32_t chan_value = LRADC_CH_ACCUMULATE | | |
319 | ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET); | |
320 | const int len = bitmap_weight(buffer->scan_mask, LRADC_MAX_TOTAL_CHANS); | |
321 | ||
322 | if (!len) | |
323 | return -EINVAL; | |
324 | ||
325 | /* | |
326 | * Lock the driver so raw access can not be done during buffered | |
327 | * operation. This simplifies the code a lot. | |
328 | */ | |
329 | ret = mutex_trylock(&lradc->lock); | |
330 | if (!ret) | |
331 | return -EBUSY; | |
332 | ||
333 | lradc->buffer = kmalloc(len * sizeof(*lradc->buffer), GFP_KERNEL); | |
334 | if (!lradc->buffer) { | |
335 | ret = -ENOMEM; | |
336 | goto err_mem; | |
337 | } | |
338 | ||
339 | ret = iio_sw_buffer_preenable(iio); | |
340 | if (ret < 0) | |
341 | goto err_buf; | |
342 | ||
343 | writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, | |
344 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
345 | writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
346 | ||
347 | for_each_set_bit(chan, buffer->scan_mask, LRADC_MAX_TOTAL_CHANS) { | |
348 | ctrl4 |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs); | |
349 | ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs); | |
350 | writel(chan_value, lradc->base + LRADC_CH(ofs)); | |
351 | enable |= 1 << ofs; | |
352 | ofs++; | |
73327b4c | 353 | } |
bc2c90c9 MV |
354 | |
355 | writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, | |
356 | lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); | |
357 | ||
358 | writel(ctrl4, lradc->base + LRADC_CTRL4); | |
359 | writel(ctrl1_irq, lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); | |
360 | ||
361 | writel(enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, | |
362 | lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_SET); | |
363 | ||
364 | return 0; | |
365 | ||
366 | err_buf: | |
367 | kfree(lradc->buffer); | |
368 | err_mem: | |
369 | mutex_unlock(&lradc->lock); | |
370 | return ret; | |
371 | } | |
372 | ||
373 | static int mxs_lradc_buffer_postdisable(struct iio_dev *iio) | |
374 | { | |
375 | struct mxs_lradc *lradc = iio_priv(iio); | |
376 | ||
377 | writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, | |
378 | lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); | |
379 | ||
380 | writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); | |
381 | writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, | |
382 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
383 | ||
384 | kfree(lradc->buffer); | |
385 | mutex_unlock(&lradc->lock); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio, | |
391 | const unsigned long *mask) | |
392 | { | |
393 | const int mw = bitmap_weight(mask, iio->masklength); | |
394 | ||
395 | return mw <= LRADC_MAX_MAPPED_CHANS; | |
396 | } | |
397 | ||
398 | static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = { | |
399 | .preenable = &mxs_lradc_buffer_preenable, | |
400 | .postenable = &iio_triggered_buffer_postenable, | |
401 | .predisable = &iio_triggered_buffer_predisable, | |
402 | .postdisable = &mxs_lradc_buffer_postdisable, | |
403 | .validate_scan_mask = &mxs_lradc_validate_scan_mask, | |
404 | }; | |
405 | ||
406 | /* | |
407 | * Driver initialization | |
408 | */ | |
409 | ||
410 | #define MXS_ADC_CHAN(idx, chan_type) { \ | |
411 | .type = (chan_type), \ | |
412 | .indexed = 1, \ | |
413 | .scan_index = (idx), \ | |
414 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \ | |
415 | .channel = (idx), \ | |
416 | .scan_type = { \ | |
417 | .sign = 'u', \ | |
418 | .realbits = 18, \ | |
419 | .storagebits = 32, \ | |
420 | }, \ | |
421 | } | |
422 | ||
423 | static const struct iio_chan_spec mxs_lradc_chan_spec[] = { | |
424 | MXS_ADC_CHAN(0, IIO_VOLTAGE), | |
425 | MXS_ADC_CHAN(1, IIO_VOLTAGE), | |
426 | MXS_ADC_CHAN(2, IIO_VOLTAGE), | |
427 | MXS_ADC_CHAN(3, IIO_VOLTAGE), | |
428 | MXS_ADC_CHAN(4, IIO_VOLTAGE), | |
429 | MXS_ADC_CHAN(5, IIO_VOLTAGE), | |
430 | MXS_ADC_CHAN(6, IIO_VOLTAGE), | |
431 | MXS_ADC_CHAN(7, IIO_VOLTAGE), /* VBATT */ | |
432 | MXS_ADC_CHAN(8, IIO_TEMP), /* Temp sense 0 */ | |
433 | MXS_ADC_CHAN(9, IIO_TEMP), /* Temp sense 1 */ | |
434 | MXS_ADC_CHAN(10, IIO_VOLTAGE), /* VDDIO */ | |
435 | MXS_ADC_CHAN(11, IIO_VOLTAGE), /* VTH */ | |
436 | MXS_ADC_CHAN(12, IIO_VOLTAGE), /* VDDA */ | |
437 | MXS_ADC_CHAN(13, IIO_VOLTAGE), /* VDDD */ | |
438 | MXS_ADC_CHAN(14, IIO_VOLTAGE), /* VBG */ | |
439 | MXS_ADC_CHAN(15, IIO_VOLTAGE), /* VDD5V */ | |
440 | }; | |
441 | ||
442 | static void mxs_lradc_hw_init(struct mxs_lradc *lradc) | |
443 | { | |
444 | int i; | |
445 | const uint32_t cfg = | |
446 | (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET); | |
447 | ||
448 | stmp_reset_block(lradc->base); | |
449 | ||
450 | for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++) | |
451 | writel(cfg | (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + i)), | |
452 | lradc->base + LRADC_DELAY(i)); | |
453 | ||
454 | /* Start internal temperature sensing. */ | |
455 | writel(0, lradc->base + LRADC_CTRL2); | |
456 | } | |
457 | ||
458 | static void mxs_lradc_hw_stop(struct mxs_lradc *lradc) | |
459 | { | |
460 | int i; | |
461 | ||
462 | writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, | |
463 | lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); | |
464 | ||
465 | for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++) | |
466 | writel(0, lradc->base + LRADC_DELAY(i)); | |
467 | } | |
468 | ||
4ae1c61f | 469 | static int mxs_lradc_probe(struct platform_device *pdev) |
bc2c90c9 MV |
470 | { |
471 | struct device *dev = &pdev->dev; | |
472 | struct mxs_lradc *lradc; | |
473 | struct iio_dev *iio; | |
474 | struct resource *iores; | |
475 | int ret = 0; | |
476 | int i; | |
477 | ||
478 | /* Allocate the IIO device. */ | |
479 | iio = iio_device_alloc(sizeof(*lradc)); | |
480 | if (!iio) { | |
481 | dev_err(dev, "Failed to allocate IIO device\n"); | |
482 | return -ENOMEM; | |
483 | } | |
484 | ||
485 | lradc = iio_priv(iio); | |
486 | ||
487 | /* Grab the memory area */ | |
488 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
489 | lradc->dev = &pdev->dev; | |
490 | lradc->base = devm_request_and_ioremap(dev, iores); | |
491 | if (!lradc->base) { | |
492 | ret = -EADDRNOTAVAIL; | |
493 | goto err_addr; | |
494 | } | |
495 | ||
496 | /* Grab all IRQ sources */ | |
497 | for (i = 0; i < 13; i++) { | |
498 | lradc->irq[i] = platform_get_irq(pdev, i); | |
499 | if (lradc->irq[i] < 0) { | |
500 | ret = -EINVAL; | |
501 | goto err_addr; | |
502 | } | |
503 | ||
504 | ret = devm_request_irq(dev, lradc->irq[i], | |
505 | mxs_lradc_handle_irq, 0, | |
506 | mxs_lradc_irq_name[i], iio); | |
507 | if (ret) | |
508 | goto err_addr; | |
509 | } | |
510 | ||
511 | platform_set_drvdata(pdev, iio); | |
512 | ||
513 | init_completion(&lradc->completion); | |
514 | mutex_init(&lradc->lock); | |
515 | ||
516 | iio->name = pdev->name; | |
517 | iio->dev.parent = &pdev->dev; | |
518 | iio->info = &mxs_lradc_iio_info; | |
519 | iio->modes = INDIO_DIRECT_MODE; | |
520 | iio->channels = mxs_lradc_chan_spec; | |
521 | iio->num_channels = ARRAY_SIZE(mxs_lradc_chan_spec); | |
522 | ||
523 | ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time, | |
524 | &mxs_lradc_trigger_handler, | |
525 | &mxs_lradc_buffer_ops); | |
526 | if (ret) | |
527 | goto err_addr; | |
528 | ||
529 | ret = mxs_lradc_trigger_init(iio); | |
530 | if (ret) | |
531 | goto err_trig; | |
532 | ||
533 | /* Register IIO device. */ | |
534 | ret = iio_device_register(iio); | |
535 | if (ret) { | |
536 | dev_err(dev, "Failed to register IIO device\n"); | |
537 | goto err_dev; | |
538 | } | |
539 | ||
540 | /* Configure the hardware. */ | |
541 | mxs_lradc_hw_init(lradc); | |
542 | ||
543 | return 0; | |
544 | ||
545 | err_dev: | |
546 | mxs_lradc_trigger_remove(iio); | |
547 | err_trig: | |
548 | iio_triggered_buffer_cleanup(iio); | |
549 | err_addr: | |
550 | iio_device_free(iio); | |
551 | return ret; | |
552 | } | |
553 | ||
447d4f29 | 554 | static int mxs_lradc_remove(struct platform_device *pdev) |
bc2c90c9 MV |
555 | { |
556 | struct iio_dev *iio = platform_get_drvdata(pdev); | |
557 | struct mxs_lradc *lradc = iio_priv(iio); | |
558 | ||
559 | mxs_lradc_hw_stop(lradc); | |
560 | ||
561 | iio_device_unregister(iio); | |
562 | iio_triggered_buffer_cleanup(iio); | |
563 | mxs_lradc_trigger_remove(iio); | |
564 | iio_device_free(iio); | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static const struct of_device_id mxs_lradc_dt_ids[] = { | |
570 | { .compatible = "fsl,imx28-lradc", }, | |
571 | { /* sentinel */ } | |
572 | }; | |
573 | MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); | |
574 | ||
575 | static struct platform_driver mxs_lradc_driver = { | |
576 | .driver = { | |
577 | .name = DRIVER_NAME, | |
578 | .owner = THIS_MODULE, | |
579 | .of_match_table = mxs_lradc_dt_ids, | |
580 | }, | |
581 | .probe = mxs_lradc_probe, | |
e543acf0 | 582 | .remove = mxs_lradc_remove, |
bc2c90c9 MV |
583 | }; |
584 | ||
585 | module_platform_driver(mxs_lradc_driver); | |
586 | ||
587 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); | |
588 | MODULE_DESCRIPTION("Freescale i.MX28 LRADC driver"); | |
589 | MODULE_LICENSE("GPL v2"); |