1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2016 Broadcom
4 */
5
6 #include <linux/module.h>
7 #include <linux/mod_devicetable.h>
8 #include <linux/io.h>
9 #include <linux/clk.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/regmap.h>
12 #include <linux/delay.h>
13 #include <linux/interrupt.h>
14 #include <linux/platform_device.h>
15
16 #include <linux/iio/iio.h>
17
18 /* Below Register's are common to IPROC ADC and Touchscreen IP */
19 #define IPROC_REGCTL1 0x00
20 #define IPROC_REGCTL2 0x04
21 #define IPROC_INTERRUPT_THRES 0x08
22 #define IPROC_INTERRUPT_MASK 0x0c
23 #define IPROC_INTERRUPT_STATUS 0x10
24 #define IPROC_ANALOG_CONTROL 0x1c
25 #define IPROC_CONTROLLER_STATUS 0x14
26 #define IPROC_AUX_DATA 0x20
27 #define IPROC_SOFT_BYPASS_CONTROL 0x38
28 #define IPROC_SOFT_BYPASS_DATA 0x3C
29
30 /* IPROC ADC Channel register offsets */
31 #define IPROC_ADC_CHANNEL_REGCTL1 0x800
32 #define IPROC_ADC_CHANNEL_REGCTL2 0x804
33 #define IPROC_ADC_CHANNEL_STATUS 0x808
34 #define IPROC_ADC_CHANNEL_INTERRUPT_STATUS 0x80c
35 #define IPROC_ADC_CHANNEL_INTERRUPT_MASK 0x810
36 #define IPROC_ADC_CHANNEL_DATA 0x814
37 #define IPROC_ADC_CHANNEL_OFFSET 0x20
38
39 /* Bit definitions for IPROC_REGCTL2 */
40 #define IPROC_ADC_AUXIN_SCAN_ENA BIT(0)
41 #define IPROC_ADC_PWR_LDO BIT(5)
42 #define IPROC_ADC_PWR_ADC BIT(4)
43 #define IPROC_ADC_PWR_BG BIT(3)
44 #define IPROC_ADC_CONTROLLER_EN BIT(17)
45
46 /* Bit definitions for IPROC_INTERRUPT_MASK and IPROC_INTERRUPT_STATUS */
47 #define IPROC_ADC_AUXDATA_RDY_INTR BIT(3)
48 #define IPROC_ADC_INTR 9
49 #define IPROC_ADC_INTR_MASK (0xFF << IPROC_ADC_INTR)
50
51 /* Bit definitions for IPROC_ANALOG_CONTROL */
52 #define IPROC_ADC_CHANNEL_SEL 11
53 #define IPROC_ADC_CHANNEL_SEL_MASK (0x7 << IPROC_ADC_CHANNEL_SEL)
54
55 /* Bit definitions for IPROC_ADC_CHANNEL_REGCTL1 */
56 #define IPROC_ADC_CHANNEL_ROUNDS 0x2
57 #define IPROC_ADC_CHANNEL_ROUNDS_MASK (0x3F << IPROC_ADC_CHANNEL_ROUNDS)
58 #define IPROC_ADC_CHANNEL_MODE 0x1
59 #define IPROC_ADC_CHANNEL_MODE_MASK (0x1 << IPROC_ADC_CHANNEL_MODE)
60 #define IPROC_ADC_CHANNEL_MODE_TDM 0x1
61 #define IPROC_ADC_CHANNEL_MODE_SNAPSHOT 0x0
62 #define IPROC_ADC_CHANNEL_ENABLE 0x0
63 #define IPROC_ADC_CHANNEL_ENABLE_MASK 0x1
64
65 /* Bit definitions for IPROC_ADC_CHANNEL_REGCTL2 */
66 #define IPROC_ADC_CHANNEL_WATERMARK 0x0
67 #define IPROC_ADC_CHANNEL_WATERMARK_MASK \
68 (0x3F << IPROC_ADC_CHANNEL_WATERMARK)
69
70 #define IPROC_ADC_WATER_MARK_LEVEL 0x1
71
72 /* Bit definitions for IPROC_ADC_CHANNEL_STATUS */
73 #define IPROC_ADC_CHANNEL_DATA_LOST 0x0
74 #define IPROC_ADC_CHANNEL_DATA_LOST_MASK \
75 (0x0 << IPROC_ADC_CHANNEL_DATA_LOST)
76 #define IPROC_ADC_CHANNEL_VALID_ENTERIES 0x1
77 #define IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK \
78 (0xFF << IPROC_ADC_CHANNEL_VALID_ENTERIES)
79 #define IPROC_ADC_CHANNEL_TOTAL_ENTERIES 0x9
80 #define IPROC_ADC_CHANNEL_TOTAL_ENTERIES_MASK \
81 (0xFF << IPROC_ADC_CHANNEL_TOTAL_ENTERIES)
82
83 /* Bit definitions for IPROC_ADC_CHANNEL_INTERRUPT_MASK */
84 #define IPROC_ADC_CHANNEL_WTRMRK_INTR 0x0
85 #define IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK \
86 (0x1 << IPROC_ADC_CHANNEL_WTRMRK_INTR)
87 #define IPROC_ADC_CHANNEL_FULL_INTR 0x1
88 #define IPROC_ADC_CHANNEL_FULL_INTR_MASK \
89 (0x1 << IPROC_ADC_IPROC_ADC_CHANNEL_FULL_INTR)
90 #define IPROC_ADC_CHANNEL_EMPTY_INTR 0x2
91 #define IPROC_ADC_CHANNEL_EMPTY_INTR_MASK \
92 (0x1 << IPROC_ADC_CHANNEL_EMPTY_INTR)
93
94 #define IPROC_ADC_WATER_MARK_INTR_ENABLE 0x1
95
96 /* Number of time to retry a set of the interrupt mask reg */
97 #define IPROC_ADC_INTMASK_RETRY_ATTEMPTS 10
98
99 #define IPROC_ADC_READ_TIMEOUT (HZ*2)
100
101 #define iproc_adc_dbg_reg(dev, priv, reg) \
102 do { \
103 u32 val; \
104 regmap_read(priv->regmap, reg, &val); \
105 dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \
106 } while (0)
107
108 struct iproc_adc_priv {
109 struct regmap *regmap;
110 struct clk *adc_clk;
111 struct mutex mutex;
112 int irqno;
113 int chan_val;
114 int chan_id;
115 struct completion completion;
116 };
117
iproc_adc_reg_dump(struct iio_dev * indio_dev)118 static void iproc_adc_reg_dump(struct iio_dev *indio_dev)
119 {
120 struct device *dev = &indio_dev->dev;
121 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
122
123 iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL1);
124 iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL2);
125 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_THRES);
126 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_MASK);
127 iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_STATUS);
128 iproc_adc_dbg_reg(dev, adc_priv, IPROC_CONTROLLER_STATUS);
129 iproc_adc_dbg_reg(dev, adc_priv, IPROC_ANALOG_CONTROL);
130 iproc_adc_dbg_reg(dev, adc_priv, IPROC_AUX_DATA);
131 iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_CONTROL);
132 iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_DATA);
133 }
134
iproc_adc_interrupt_thread(int irq,void * data)135 static irqreturn_t iproc_adc_interrupt_thread(int irq, void *data)
136 {
137 u32 channel_intr_status;
138 u32 intr_status;
139 u32 intr_mask;
140 struct iio_dev *indio_dev = data;
141 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
142
143 /*
144 * This interrupt is shared with the touchscreen driver.
145 * Make sure this interrupt is intended for us.
146 * Handle only ADC channel specific interrupts.
147 */
148 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, &intr_status);
149 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &intr_mask);
150 intr_status = intr_status & intr_mask;
151 channel_intr_status = (intr_status & IPROC_ADC_INTR_MASK) >>
152 IPROC_ADC_INTR;
153 if (channel_intr_status)
154 return IRQ_WAKE_THREAD;
155
156 return IRQ_NONE;
157 }
158
iproc_adc_interrupt_handler(int irq,void * data)159 static irqreturn_t iproc_adc_interrupt_handler(int irq, void *data)
160 {
161 irqreturn_t retval = IRQ_NONE;
162 struct iproc_adc_priv *adc_priv;
163 struct iio_dev *indio_dev = data;
164 unsigned int valid_entries;
165 u32 intr_status;
166 u32 intr_channels;
167 u32 channel_status;
168 u32 ch_intr_status;
169
170 adc_priv = iio_priv(indio_dev);
171
172 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, &intr_status);
173 dev_dbg(&indio_dev->dev, "iproc_adc_interrupt_handler(),INTRPT_STS:%x\n",
174 intr_status);
175
176 intr_channels = (intr_status & IPROC_ADC_INTR_MASK) >> IPROC_ADC_INTR;
177 if (intr_channels) {
178 regmap_read(adc_priv->regmap,
179 IPROC_ADC_CHANNEL_INTERRUPT_STATUS +
180 IPROC_ADC_CHANNEL_OFFSET * adc_priv->chan_id,
181 &ch_intr_status);
182
183 if (ch_intr_status & IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK) {
184 regmap_read(adc_priv->regmap,
185 IPROC_ADC_CHANNEL_STATUS +
186 IPROC_ADC_CHANNEL_OFFSET *
187 adc_priv->chan_id,
188 &channel_status);
189
190 valid_entries = ((channel_status &
191 IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK) >>
192 IPROC_ADC_CHANNEL_VALID_ENTERIES);
193 if (valid_entries >= 1) {
194 regmap_read(adc_priv->regmap,
195 IPROC_ADC_CHANNEL_DATA +
196 IPROC_ADC_CHANNEL_OFFSET *
197 adc_priv->chan_id,
198 &adc_priv->chan_val);
199 complete(&adc_priv->completion);
200 } else {
201 dev_err(&indio_dev->dev,
202 "No data rcvd on channel %d\n",
203 adc_priv->chan_id);
204 }
205 regmap_write(adc_priv->regmap,
206 IPROC_ADC_CHANNEL_INTERRUPT_MASK +
207 IPROC_ADC_CHANNEL_OFFSET *
208 adc_priv->chan_id,
209 (ch_intr_status &
210 ~(IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK)));
211 }
212 regmap_write(adc_priv->regmap,
213 IPROC_ADC_CHANNEL_INTERRUPT_STATUS +
214 IPROC_ADC_CHANNEL_OFFSET * adc_priv->chan_id,
215 ch_intr_status);
216 regmap_write(adc_priv->regmap, IPROC_INTERRUPT_STATUS,
217 intr_channels);
218 retval = IRQ_HANDLED;
219 }
220
221 return retval;
222 }
223
iproc_adc_do_read(struct iio_dev * indio_dev,int channel,u16 * p_adc_data)224 static int iproc_adc_do_read(struct iio_dev *indio_dev,
225 int channel,
226 u16 *p_adc_data)
227 {
228 int read_len = 0;
229 u32 val;
230 u32 mask;
231 u32 val_check;
232 int failed_cnt = 0;
233 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
234
235 mutex_lock(&adc_priv->mutex);
236
237 /*
238 * After a read is complete the ADC interrupts will be disabled so
239 * we can assume this section of code is safe from interrupts.
240 */
241 adc_priv->chan_val = -1;
242 adc_priv->chan_id = channel;
243
244 reinit_completion(&adc_priv->completion);
245 /* Clear any pending interrupt */
246 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS,
247 IPROC_ADC_INTR_MASK | IPROC_ADC_AUXDATA_RDY_INTR,
248 ((0x0 << channel) << IPROC_ADC_INTR) |
249 IPROC_ADC_AUXDATA_RDY_INTR);
250
251 /* Configure channel for snapshot mode and enable */
252 val = (BIT(IPROC_ADC_CHANNEL_ROUNDS) |
253 (IPROC_ADC_CHANNEL_MODE_SNAPSHOT << IPROC_ADC_CHANNEL_MODE) |
254 (0x1 << IPROC_ADC_CHANNEL_ENABLE));
255
256 mask = IPROC_ADC_CHANNEL_ROUNDS_MASK | IPROC_ADC_CHANNEL_MODE_MASK |
257 IPROC_ADC_CHANNEL_ENABLE_MASK;
258 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_REGCTL1 +
259 IPROC_ADC_CHANNEL_OFFSET * channel),
260 mask, val);
261
262 /* Set the Watermark for a channel */
263 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_REGCTL2 +
264 IPROC_ADC_CHANNEL_OFFSET * channel),
265 IPROC_ADC_CHANNEL_WATERMARK_MASK,
266 0x1);
267
268 /* Enable water mark interrupt */
269 regmap_update_bits(adc_priv->regmap, (IPROC_ADC_CHANNEL_INTERRUPT_MASK +
270 IPROC_ADC_CHANNEL_OFFSET *
271 channel),
272 IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK,
273 IPROC_ADC_WATER_MARK_INTR_ENABLE);
274 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val);
275
276 /* Enable ADC interrupt for a channel */
277 val |= (BIT(channel) << IPROC_ADC_INTR);
278 regmap_write(adc_priv->regmap, IPROC_INTERRUPT_MASK, val);
279
280 /*
281 * There seems to be a very rare issue where writing to this register
282 * does not take effect. To work around the issue we will try multiple
283 * writes. In total we will spend about 10*10 = 100 us attempting this.
284 * Testing has shown that this may loop a few time, but we have never
285 * hit the full count.
286 */
287 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check);
288 while (val_check != val) {
289 failed_cnt++;
290
291 if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS)
292 break;
293
294 udelay(10);
295 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_MASK,
296 IPROC_ADC_INTR_MASK,
297 ((0x1 << channel) <<
298 IPROC_ADC_INTR));
299
300 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check);
301 }
302
303 if (failed_cnt) {
304 dev_dbg(&indio_dev->dev,
305 "IntMask failed (%d times)", failed_cnt);
306 if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS) {
307 dev_err(&indio_dev->dev,
308 "IntMask set failed. Read will likely fail.");
309 read_len = -EIO;
310 goto adc_err;
311 }
312 }
313 regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val_check);
314
315 if (wait_for_completion_timeout(&adc_priv->completion,
316 IPROC_ADC_READ_TIMEOUT) > 0) {
317
318 /* Only the lower 16 bits are relevant */
319 *p_adc_data = adc_priv->chan_val & 0xFFFF;
320 read_len = sizeof(*p_adc_data);
321
322 } else {
323 /*
324 * We never got the interrupt, something went wrong.
325 * Perhaps the interrupt may still be coming, we do not want
326 * that now. Lets disable the ADC interrupt, and clear the
327 * status to put it back in to normal state.
328 */
329 read_len = -ETIMEDOUT;
330 goto adc_err;
331 }
332 mutex_unlock(&adc_priv->mutex);
333
334 return read_len;
335
336 adc_err:
337 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_MASK,
338 IPROC_ADC_INTR_MASK,
339 ((0x0 << channel) << IPROC_ADC_INTR));
340
341 regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS,
342 IPROC_ADC_INTR_MASK,
343 ((0x0 << channel) << IPROC_ADC_INTR));
344
345 dev_err(&indio_dev->dev, "Timed out waiting for ADC data!\n");
346 iproc_adc_reg_dump(indio_dev);
347 mutex_unlock(&adc_priv->mutex);
348
349 return read_len;
350 }
351
iproc_adc_enable(struct iio_dev * indio_dev)352 static int iproc_adc_enable(struct iio_dev *indio_dev)
353 {
354 u32 val;
355 u32 channel_id;
356 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
357 int ret;
358
359 /* Set i_amux = 3b'000, select channel 0 */
360 ret = regmap_clear_bits(adc_priv->regmap, IPROC_ANALOG_CONTROL,
361 IPROC_ADC_CHANNEL_SEL_MASK);
362 if (ret) {
363 dev_err(&indio_dev->dev,
364 "failed to write IPROC_ANALOG_CONTROL %d\n", ret);
365 return ret;
366 }
367 adc_priv->chan_val = -1;
368
369 /*
370 * PWR up LDO, ADC, and Band Gap (0 to enable)
371 * Also enable ADC controller (set high)
372 */
373 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val);
374 if (ret) {
375 dev_err(&indio_dev->dev,
376 "failed to read IPROC_REGCTL2 %d\n", ret);
377 return ret;
378 }
379
380 val &= ~(IPROC_ADC_PWR_LDO | IPROC_ADC_PWR_ADC | IPROC_ADC_PWR_BG);
381
382 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val);
383 if (ret) {
384 dev_err(&indio_dev->dev,
385 "failed to write IPROC_REGCTL2 %d\n", ret);
386 return ret;
387 }
388
389 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val);
390 if (ret) {
391 dev_err(&indio_dev->dev,
392 "failed to read IPROC_REGCTL2 %d\n", ret);
393 return ret;
394 }
395
396 val |= IPROC_ADC_CONTROLLER_EN;
397 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val);
398 if (ret) {
399 dev_err(&indio_dev->dev,
400 "failed to write IPROC_REGCTL2 %d\n", ret);
401 return ret;
402 }
403
404 for (channel_id = 0; channel_id < indio_dev->num_channels;
405 channel_id++) {
406 ret = regmap_write(adc_priv->regmap,
407 IPROC_ADC_CHANNEL_INTERRUPT_MASK +
408 IPROC_ADC_CHANNEL_OFFSET * channel_id, 0);
409 if (ret) {
410 dev_err(&indio_dev->dev,
411 "failed to write ADC_CHANNEL_INTERRUPT_MASK %d\n",
412 ret);
413 return ret;
414 }
415
416 ret = regmap_write(adc_priv->regmap,
417 IPROC_ADC_CHANNEL_INTERRUPT_STATUS +
418 IPROC_ADC_CHANNEL_OFFSET * channel_id, 0);
419 if (ret) {
420 dev_err(&indio_dev->dev,
421 "failed to write ADC_CHANNEL_INTERRUPT_STATUS %d\n",
422 ret);
423 return ret;
424 }
425 }
426
427 return 0;
428 }
429
iproc_adc_disable(struct iio_dev * indio_dev)430 static void iproc_adc_disable(struct iio_dev *indio_dev)
431 {
432 u32 val;
433 int ret;
434 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
435
436 ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val);
437 if (ret) {
438 dev_err(&indio_dev->dev,
439 "failed to read IPROC_REGCTL2 %d\n", ret);
440 return;
441 }
442
443 val &= ~IPROC_ADC_CONTROLLER_EN;
444 ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val);
445 if (ret) {
446 dev_err(&indio_dev->dev,
447 "failed to write IPROC_REGCTL2 %d\n", ret);
448 return;
449 }
450 }
451
iproc_adc_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)452 static int iproc_adc_read_raw(struct iio_dev *indio_dev,
453 struct iio_chan_spec const *chan,
454 int *val,
455 int *val2,
456 long mask)
457 {
458 u16 adc_data;
459 int err;
460
461 switch (mask) {
462 case IIO_CHAN_INFO_RAW:
463 err = iproc_adc_do_read(indio_dev, chan->channel, &adc_data);
464 if (err < 0)
465 return err;
466 *val = adc_data;
467 return IIO_VAL_INT;
468 case IIO_CHAN_INFO_SCALE:
469 switch (chan->type) {
470 case IIO_VOLTAGE:
471 *val = 1800;
472 *val2 = 10;
473 return IIO_VAL_FRACTIONAL_LOG2;
474 default:
475 return -EINVAL;
476 }
477 default:
478 return -EINVAL;
479 }
480 }
481
482 static const struct iio_info iproc_adc_iio_info = {
483 .read_raw = &iproc_adc_read_raw,
484 };
485
486 #define IPROC_ADC_CHANNEL(_index, _id) { \
487 .type = IIO_VOLTAGE, \
488 .indexed = 1, \
489 .channel = _index, \
490 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
491 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
492 .datasheet_name = _id, \
493 }
494
495 static const struct iio_chan_spec iproc_adc_iio_channels[] = {
496 IPROC_ADC_CHANNEL(0, "adc0"),
497 IPROC_ADC_CHANNEL(1, "adc1"),
498 IPROC_ADC_CHANNEL(2, "adc2"),
499 IPROC_ADC_CHANNEL(3, "adc3"),
500 IPROC_ADC_CHANNEL(4, "adc4"),
501 IPROC_ADC_CHANNEL(5, "adc5"),
502 IPROC_ADC_CHANNEL(6, "adc6"),
503 IPROC_ADC_CHANNEL(7, "adc7"),
504 };
505
iproc_adc_probe(struct platform_device * pdev)506 static int iproc_adc_probe(struct platform_device *pdev)
507 {
508 struct iproc_adc_priv *adc_priv;
509 struct iio_dev *indio_dev = NULL;
510 int ret;
511
512 indio_dev = devm_iio_device_alloc(&pdev->dev,
513 sizeof(*adc_priv));
514 if (!indio_dev) {
515 dev_err(&pdev->dev, "failed to allocate iio device\n");
516 return -ENOMEM;
517 }
518
519 adc_priv = iio_priv(indio_dev);
520 platform_set_drvdata(pdev, indio_dev);
521
522 mutex_init(&adc_priv->mutex);
523
524 init_completion(&adc_priv->completion);
525
526 adc_priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
527 "adc-syscon");
528 if (IS_ERR(adc_priv->regmap)) {
529 dev_err(&pdev->dev, "failed to get handle for tsc syscon\n");
530 ret = PTR_ERR(adc_priv->regmap);
531 return ret;
532 }
533
534 adc_priv->adc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
535 if (IS_ERR(adc_priv->adc_clk)) {
536 dev_err(&pdev->dev,
537 "failed getting clock tsc_clk\n");
538 ret = PTR_ERR(adc_priv->adc_clk);
539 return ret;
540 }
541
542 adc_priv->irqno = platform_get_irq(pdev, 0);
543 if (adc_priv->irqno < 0)
544 return adc_priv->irqno;
545
546 ret = regmap_clear_bits(adc_priv->regmap, IPROC_REGCTL2,
547 IPROC_ADC_AUXIN_SCAN_ENA);
548 if (ret) {
549 dev_err(&pdev->dev, "failed to write IPROC_REGCTL2 %d\n", ret);
550 return ret;
551 }
552
553 ret = devm_request_threaded_irq(&pdev->dev, adc_priv->irqno,
554 iproc_adc_interrupt_handler,
555 iproc_adc_interrupt_thread,
556 IRQF_SHARED, "iproc-adc", indio_dev);
557 if (ret) {
558 dev_err(&pdev->dev, "request_irq error %d\n", ret);
559 return ret;
560 }
561
562 ret = clk_prepare_enable(adc_priv->adc_clk);
563 if (ret) {
564 dev_err(&pdev->dev,
565 "clk_prepare_enable failed %d\n", ret);
566 return ret;
567 }
568
569 ret = iproc_adc_enable(indio_dev);
570 if (ret) {
571 dev_err(&pdev->dev, "failed to enable adc %d\n", ret);
572 goto err_adc_enable;
573 }
574
575 indio_dev->name = "iproc-static-adc";
576 indio_dev->info = &iproc_adc_iio_info;
577 indio_dev->modes = INDIO_DIRECT_MODE;
578 indio_dev->channels = iproc_adc_iio_channels;
579 indio_dev->num_channels = ARRAY_SIZE(iproc_adc_iio_channels);
580
581 ret = iio_device_register(indio_dev);
582 if (ret) {
583 dev_err(&pdev->dev, "iio_device_register failed:err %d\n", ret);
584 goto err_clk;
585 }
586
587 return 0;
588
589 err_clk:
590 iproc_adc_disable(indio_dev);
591 err_adc_enable:
592 clk_disable_unprepare(adc_priv->adc_clk);
593
594 return ret;
595 }
596
iproc_adc_remove(struct platform_device * pdev)597 static void iproc_adc_remove(struct platform_device *pdev)
598 {
599 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
600 struct iproc_adc_priv *adc_priv = iio_priv(indio_dev);
601
602 iio_device_unregister(indio_dev);
603 iproc_adc_disable(indio_dev);
604 clk_disable_unprepare(adc_priv->adc_clk);
605 }
606
607 static const struct of_device_id iproc_adc_of_match[] = {
608 {.compatible = "brcm,iproc-static-adc", },
609 { }
610 };
611 MODULE_DEVICE_TABLE(of, iproc_adc_of_match);
612
613 static struct platform_driver iproc_adc_driver = {
614 .probe = iproc_adc_probe,
615 .remove_new = iproc_adc_remove,
616 .driver = {
617 .name = "iproc-static-adc",
618 .of_match_table = iproc_adc_of_match,
619 },
620 };
621 module_platform_driver(iproc_adc_driver);
622
623 MODULE_DESCRIPTION("Broadcom iProc ADC controller driver");
624 MODULE_AUTHOR("Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>");
625 MODULE_LICENSE("GPL v2");
626