1 /*
2 * palmas-adc.c -- TI PALMAS GPADC.
3 *
4 * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
5 *
6 * Author: Pradeep Goudagunta <pgoudagunta@nvidia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 */
12
13 #include <linux/module.h>
14 #include <linux/err.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/i2c.h>
21 #include <linux/pm.h>
22 #include <linux/mfd/palmas.h>
23 #include <linux/completion.h>
24 #include <linux/of.h>
25 #include <linux/of_device.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/machine.h>
28 #include <linux/iio/driver.h>
29
30 #define MOD_NAME "palmas-gpadc"
31 #define PALMAS_ADC_CONVERSION_TIMEOUT (msecs_to_jiffies(5000))
32 #define PALMAS_TO_BE_CALCULATED 0
33 #define PALMAS_GPADC_TRIMINVALID -1
34
35 struct palmas_gpadc_info {
36 /* calibration codes and regs */
37 int x1; /* lower ideal code */
38 int x2; /* higher ideal code */
39 int v1; /* expected lower volt reading */
40 int v2; /* expected higher volt reading */
41 u8 trim1_reg; /* register number for lower trim */
42 u8 trim2_reg; /* register number for upper trim */
43 int gain; /* calculated from above (after reading trim regs) */
44 int offset; /* calculated from above (after reading trim regs) */
45 int gain_error; /* calculated from above (after reading trim regs) */
46 bool is_uncalibrated; /* if channel has calibration data */
47 };
48
49 #define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \
50 [PALMAS_ADC_CH_##_chan] = { \
51 .x1 = _x1, \
52 .x2 = _x2, \
53 .v1 = _v1, \
54 .v2 = _v2, \
55 .gain = PALMAS_TO_BE_CALCULATED, \
56 .offset = PALMAS_TO_BE_CALCULATED, \
57 .gain_error = PALMAS_TO_BE_CALCULATED, \
58 .trim1_reg = PALMAS_GPADC_TRIM##_t1, \
59 .trim2_reg = PALMAS_GPADC_TRIM##_t2, \
60 .is_uncalibrated = _is_uncalibrated \
61 }
62
63 static struct palmas_gpadc_info palmas_gpadc_info[] = {
64 PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false),
65 PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false),
66 PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false),
67 PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false),
68 PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false),
69 PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false),
70 PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false),
71 PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false),
72 PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false),
73 PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false),
74 PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false),
75 PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true),
76 PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true),
77 PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true),
78 PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false),
79 PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
80 };
81
82 /**
83 * struct palmas_gpadc - the palmas_gpadc structure
84 * @ch0_current: channel 0 current source setting
85 * 0: 0 uA
86 * 1: 5 uA
87 * 2: 15 uA
88 * 3: 20 uA
89 * @ch3_current: channel 0 current source setting
90 * 0: 0 uA
91 * 1: 10 uA
92 * 2: 400 uA
93 * 3: 800 uA
94 * @extended_delay: enable the gpadc extended delay mode
95 * @auto_conversion_period: define the auto_conversion_period
96 *
97 * This is the palmas_gpadc structure to store run-time information
98 * and pointers for this driver instance.
99 */
100
101 struct palmas_gpadc {
102 struct device *dev;
103 struct palmas *palmas;
104 u8 ch0_current;
105 u8 ch3_current;
106 bool extended_delay;
107 int irq;
108 int irq_auto_0;
109 int irq_auto_1;
110 struct palmas_gpadc_info *adc_info;
111 struct completion conv_completion;
112 struct palmas_adc_wakeup_property wakeup1_data;
113 struct palmas_adc_wakeup_property wakeup2_data;
114 bool wakeup1_enable;
115 bool wakeup2_enable;
116 int auto_conversion_period;
117 };
118
119 /*
120 * GPADC lock issue in AUTO mode.
121 * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
122 * mode feature.
123 * Details:
124 * When the AUTO mode is the only conversion mode enabled, if the AUTO
125 * mode feature is disabled with bit GPADC_AUTO_CTRL. AUTO_CONV1_EN = 0
126 * or bit GPADC_AUTO_CTRL. AUTO_CONV0_EN = 0 during a conversion, the
127 * conversion mechanism can be seen as locked meaning that all following
128 * conversion will give 0 as a result. Bit GPADC_STATUS.GPADC_AVAILABLE
129 * will stay at 0 meaning that GPADC is busy. An RT conversion can unlock
130 * the GPADC.
131 *
132 * Workaround(s):
133 * To avoid the lock mechanism, the workaround to follow before any stop
134 * conversion request is:
135 * Force the GPADC state machine to be ON by using the GPADC_CTRL1.
136 * GPADC_FORCE bit = 1
137 * Shutdown the GPADC AUTO conversion using
138 * GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0.
139 * After 100us, force the GPADC state machine to be OFF by using the
140 * GPADC_CTRL1. GPADC_FORCE bit = 0
141 */
142
palmas_disable_auto_conversion(struct palmas_gpadc * adc)143 static int palmas_disable_auto_conversion(struct palmas_gpadc *adc)
144 {
145 int ret;
146
147 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
148 PALMAS_GPADC_CTRL1,
149 PALMAS_GPADC_CTRL1_GPADC_FORCE,
150 PALMAS_GPADC_CTRL1_GPADC_FORCE);
151 if (ret < 0) {
152 dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
153 return ret;
154 }
155
156 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
157 PALMAS_GPADC_AUTO_CTRL,
158 PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 |
159 PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0,
160 0);
161 if (ret < 0) {
162 dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret);
163 return ret;
164 }
165
166 udelay(100);
167
168 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
169 PALMAS_GPADC_CTRL1,
170 PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
171 if (ret < 0)
172 dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
173
174 return ret;
175 }
176
palmas_gpadc_irq(int irq,void * data)177 static irqreturn_t palmas_gpadc_irq(int irq, void *data)
178 {
179 struct palmas_gpadc *adc = data;
180
181 complete(&adc->conv_completion);
182
183 return IRQ_HANDLED;
184 }
185
palmas_gpadc_irq_auto(int irq,void * data)186 static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
187 {
188 struct palmas_gpadc *adc = data;
189
190 dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
191 palmas_disable_auto_conversion(adc);
192
193 return IRQ_HANDLED;
194 }
195
palmas_gpadc_start_mask_interrupt(struct palmas_gpadc * adc,bool mask)196 static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc,
197 bool mask)
198 {
199 int ret;
200
201 if (!mask)
202 ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
203 PALMAS_INT3_MASK,
204 PALMAS_INT3_MASK_GPADC_EOC_SW, 0);
205 else
206 ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
207 PALMAS_INT3_MASK,
208 PALMAS_INT3_MASK_GPADC_EOC_SW,
209 PALMAS_INT3_MASK_GPADC_EOC_SW);
210 if (ret < 0)
211 dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret);
212
213 return ret;
214 }
215
palmas_gpadc_enable(struct palmas_gpadc * adc,int adc_chan,int enable)216 static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan,
217 int enable)
218 {
219 unsigned int mask, val;
220 int ret;
221
222 if (enable) {
223 val = (adc->extended_delay
224 << PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT);
225 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
226 PALMAS_GPADC_RT_CTRL,
227 PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val);
228 if (ret < 0) {
229 dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret);
230 return ret;
231 }
232
233 mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK |
234 PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK |
235 PALMAS_GPADC_CTRL1_GPADC_FORCE);
236 val = (adc->ch0_current
237 << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT);
238 val |= (adc->ch3_current
239 << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT);
240 val |= PALMAS_GPADC_CTRL1_GPADC_FORCE;
241 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
242 PALMAS_GPADC_CTRL1, mask, val);
243 if (ret < 0) {
244 dev_err(adc->dev,
245 "Failed to update current setting: %d\n", ret);
246 return ret;
247 }
248
249 mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK |
250 PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
251 val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
252 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
253 PALMAS_GPADC_SW_SELECT, mask, val);
254 if (ret < 0) {
255 dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret);
256 return ret;
257 }
258 } else {
259 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
260 PALMAS_GPADC_SW_SELECT, 0);
261 if (ret < 0)
262 dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret);
263
264 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
265 PALMAS_GPADC_CTRL1,
266 PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
267 if (ret < 0) {
268 dev_err(adc->dev, "CTRL1 update failed: %d\n", ret);
269 return ret;
270 }
271 }
272
273 return ret;
274 }
275
palmas_gpadc_read_prepare(struct palmas_gpadc * adc,int adc_chan)276 static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
277 {
278 int ret;
279
280 ret = palmas_gpadc_enable(adc, adc_chan, true);
281 if (ret < 0)
282 return ret;
283
284 return palmas_gpadc_start_mask_interrupt(adc, 0);
285 }
286
palmas_gpadc_read_done(struct palmas_gpadc * adc,int adc_chan)287 static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan)
288 {
289 palmas_gpadc_start_mask_interrupt(adc, 1);
290 palmas_gpadc_enable(adc, adc_chan, false);
291 }
292
palmas_gpadc_calibrate(struct palmas_gpadc * adc,int adc_chan)293 static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan)
294 {
295 int k;
296 int d1;
297 int d2;
298 int ret;
299 int gain;
300 int x1 = adc->adc_info[adc_chan].x1;
301 int x2 = adc->adc_info[adc_chan].x2;
302 int v1 = adc->adc_info[adc_chan].v1;
303 int v2 = adc->adc_info[adc_chan].v2;
304
305 ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
306 adc->adc_info[adc_chan].trim1_reg, &d1);
307 if (ret < 0) {
308 dev_err(adc->dev, "TRIM read failed: %d\n", ret);
309 goto scrub;
310 }
311
312 ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
313 adc->adc_info[adc_chan].trim2_reg, &d2);
314 if (ret < 0) {
315 dev_err(adc->dev, "TRIM read failed: %d\n", ret);
316 goto scrub;
317 }
318
319 /* gain error calculation */
320 k = (1000 + (1000 * (d2 - d1)) / (x2 - x1));
321
322 /* gain calculation */
323 gain = ((v2 - v1) * 1000) / (x2 - x1);
324
325 adc->adc_info[adc_chan].gain_error = k;
326 adc->adc_info[adc_chan].gain = gain;
327 /* offset Calculation */
328 adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1);
329
330 scrub:
331 return ret;
332 }
333
palmas_gpadc_start_conversion(struct palmas_gpadc * adc,int adc_chan)334 static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
335 {
336 unsigned int val;
337 int ret;
338
339 init_completion(&adc->conv_completion);
340 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
341 PALMAS_GPADC_SW_SELECT,
342 PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
343 PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
344 if (ret < 0) {
345 dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
346 return ret;
347 }
348
349 ret = wait_for_completion_timeout(&adc->conv_completion,
350 PALMAS_ADC_CONVERSION_TIMEOUT);
351 if (ret == 0) {
352 dev_err(adc->dev, "conversion not completed\n");
353 return -ETIMEDOUT;
354 }
355
356 ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
357 PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
358 if (ret < 0) {
359 dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
360 return ret;
361 }
362
363 ret = val & 0xFFF;
364
365 return ret;
366 }
367
palmas_gpadc_get_calibrated_code(struct palmas_gpadc * adc,int adc_chan,int val)368 static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
369 int adc_chan, int val)
370 {
371 if (!adc->adc_info[adc_chan].is_uncalibrated)
372 val = (val*1000 - adc->adc_info[adc_chan].offset) /
373 adc->adc_info[adc_chan].gain_error;
374
375 if (val < 0) {
376 dev_err(adc->dev, "Mismatch with calibration\n");
377 return 0;
378 }
379
380 val = (val * adc->adc_info[adc_chan].gain) / 1000;
381
382 return val;
383 }
384
palmas_gpadc_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)385 static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
386 struct iio_chan_spec const *chan, int *val, int *val2, long mask)
387 {
388 struct palmas_gpadc *adc = iio_priv(indio_dev);
389 int adc_chan = chan->channel;
390 int ret = 0;
391
392 if (adc_chan > PALMAS_ADC_CH_MAX)
393 return -EINVAL;
394
395 mutex_lock(&indio_dev->mlock);
396
397 switch (mask) {
398 case IIO_CHAN_INFO_RAW:
399 case IIO_CHAN_INFO_PROCESSED:
400 ret = palmas_gpadc_read_prepare(adc, adc_chan);
401 if (ret < 0)
402 goto out;
403
404 ret = palmas_gpadc_start_conversion(adc, adc_chan);
405 if (ret < 0) {
406 dev_err(adc->dev,
407 "ADC start conversion failed\n");
408 goto out;
409 }
410
411 if (mask == IIO_CHAN_INFO_PROCESSED)
412 ret = palmas_gpadc_get_calibrated_code(
413 adc, adc_chan, ret);
414
415 *val = ret;
416
417 ret = IIO_VAL_INT;
418 goto out;
419 }
420
421 mutex_unlock(&indio_dev->mlock);
422 return ret;
423
424 out:
425 palmas_gpadc_read_done(adc, adc_chan);
426 mutex_unlock(&indio_dev->mlock);
427
428 return ret;
429 }
430
431 static const struct iio_info palmas_gpadc_iio_info = {
432 .read_raw = palmas_gpadc_read_raw,
433 };
434
435 #define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info) \
436 { \
437 .datasheet_name = PALMAS_DATASHEET_NAME(chan), \
438 .type = _type, \
439 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
440 BIT(chan_info), \
441 .indexed = 1, \
442 .channel = PALMAS_ADC_CH_##chan, \
443 }
444
445 static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
446 PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
447 PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW),
448 PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
449 PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW),
450 PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
451 PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
452 PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
453 PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
454 PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
455 PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
456 PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
457 PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
458 PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW),
459 PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW),
460 PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
461 PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
462 };
463
palmas_gpadc_get_adc_dt_data(struct platform_device * pdev,struct palmas_gpadc_platform_data ** gpadc_pdata)464 static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
465 struct palmas_gpadc_platform_data **gpadc_pdata)
466 {
467 struct device_node *np = pdev->dev.of_node;
468 struct palmas_gpadc_platform_data *gp_data;
469 int ret;
470 u32 pval;
471
472 gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL);
473 if (!gp_data)
474 return -ENOMEM;
475
476 ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval);
477 if (!ret)
478 gp_data->ch0_current = pval;
479
480 ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval);
481 if (!ret)
482 gp_data->ch3_current = pval;
483
484 gp_data->extended_delay = of_property_read_bool(np,
485 "ti,enable-extended-delay");
486
487 *gpadc_pdata = gp_data;
488
489 return 0;
490 }
491
palmas_gpadc_probe(struct platform_device * pdev)492 static int palmas_gpadc_probe(struct platform_device *pdev)
493 {
494 struct palmas_gpadc *adc;
495 struct palmas_platform_data *pdata;
496 struct palmas_gpadc_platform_data *gpadc_pdata = NULL;
497 struct iio_dev *indio_dev;
498 int ret, i;
499
500 pdata = dev_get_platdata(pdev->dev.parent);
501
502 if (pdata && pdata->gpadc_pdata)
503 gpadc_pdata = pdata->gpadc_pdata;
504
505 if (!gpadc_pdata && pdev->dev.of_node) {
506 ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata);
507 if (ret < 0)
508 return ret;
509 }
510 if (!gpadc_pdata)
511 return -EINVAL;
512
513 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
514 if (!indio_dev) {
515 dev_err(&pdev->dev, "iio_device_alloc failed\n");
516 return -ENOMEM;
517 }
518
519 adc = iio_priv(indio_dev);
520 adc->dev = &pdev->dev;
521 adc->palmas = dev_get_drvdata(pdev->dev.parent);
522 adc->adc_info = palmas_gpadc_info;
523 init_completion(&adc->conv_completion);
524 dev_set_drvdata(&pdev->dev, indio_dev);
525
526 adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
527 adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
528 if (adc->irq < 0) {
529 dev_err(adc->dev,
530 "get virq failed: %d\n", adc->irq);
531 ret = adc->irq;
532 goto out;
533 }
534 ret = request_threaded_irq(adc->irq, NULL,
535 palmas_gpadc_irq,
536 IRQF_ONESHOT, dev_name(adc->dev),
537 adc);
538 if (ret < 0) {
539 dev_err(adc->dev,
540 "request irq %d failed: %d\n", adc->irq, ret);
541 goto out;
542 }
543
544 if (gpadc_pdata->adc_wakeup1_data) {
545 memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
546 sizeof(adc->wakeup1_data));
547 adc->wakeup1_enable = true;
548 adc->irq_auto_0 = platform_get_irq(pdev, 1);
549 ret = request_threaded_irq(adc->irq_auto_0, NULL,
550 palmas_gpadc_irq_auto,
551 IRQF_ONESHOT,
552 "palmas-adc-auto-0", adc);
553 if (ret < 0) {
554 dev_err(adc->dev, "request auto0 irq %d failed: %d\n",
555 adc->irq_auto_0, ret);
556 goto out_irq_free;
557 }
558 }
559
560 if (gpadc_pdata->adc_wakeup2_data) {
561 memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data,
562 sizeof(adc->wakeup2_data));
563 adc->wakeup2_enable = true;
564 adc->irq_auto_1 = platform_get_irq(pdev, 2);
565 ret = request_threaded_irq(adc->irq_auto_1, NULL,
566 palmas_gpadc_irq_auto,
567 IRQF_ONESHOT,
568 "palmas-adc-auto-1", adc);
569 if (ret < 0) {
570 dev_err(adc->dev, "request auto1 irq %d failed: %d\n",
571 adc->irq_auto_1, ret);
572 goto out_irq_auto0_free;
573 }
574 }
575
576 /* set the current source 0 (value 0/5/15/20 uA => 0..3) */
577 if (gpadc_pdata->ch0_current <= 1)
578 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
579 else if (gpadc_pdata->ch0_current <= 5)
580 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5;
581 else if (gpadc_pdata->ch0_current <= 15)
582 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15;
583 else
584 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20;
585
586 /* set the current source 3 (value 0/10/400/800 uA => 0..3) */
587 if (gpadc_pdata->ch3_current <= 1)
588 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0;
589 else if (gpadc_pdata->ch3_current <= 10)
590 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10;
591 else if (gpadc_pdata->ch3_current <= 400)
592 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400;
593 else
594 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800;
595
596 adc->extended_delay = gpadc_pdata->extended_delay;
597
598 indio_dev->name = MOD_NAME;
599 indio_dev->dev.parent = &pdev->dev;
600 indio_dev->info = &palmas_gpadc_iio_info;
601 indio_dev->modes = INDIO_DIRECT_MODE;
602 indio_dev->channels = palmas_gpadc_iio_channel;
603 indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
604
605 ret = iio_device_register(indio_dev);
606 if (ret < 0) {
607 dev_err(adc->dev, "iio_device_register() failed: %d\n", ret);
608 goto out_irq_auto1_free;
609 }
610
611 device_set_wakeup_capable(&pdev->dev, 1);
612 for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
613 if (!(adc->adc_info[i].is_uncalibrated))
614 palmas_gpadc_calibrate(adc, i);
615 }
616
617 if (adc->wakeup1_enable || adc->wakeup2_enable)
618 device_wakeup_enable(&pdev->dev);
619
620 return 0;
621
622 out_irq_auto1_free:
623 if (gpadc_pdata->adc_wakeup2_data)
624 free_irq(adc->irq_auto_1, adc);
625 out_irq_auto0_free:
626 if (gpadc_pdata->adc_wakeup1_data)
627 free_irq(adc->irq_auto_0, adc);
628 out_irq_free:
629 free_irq(adc->irq, adc);
630 out:
631 return ret;
632 }
633
palmas_gpadc_remove(struct platform_device * pdev)634 static int palmas_gpadc_remove(struct platform_device *pdev)
635 {
636 struct iio_dev *indio_dev = dev_get_drvdata(&pdev->dev);
637 struct palmas_gpadc *adc = iio_priv(indio_dev);
638
639 if (adc->wakeup1_enable || adc->wakeup2_enable)
640 device_wakeup_disable(&pdev->dev);
641 iio_device_unregister(indio_dev);
642 free_irq(adc->irq, adc);
643 if (adc->wakeup1_enable)
644 free_irq(adc->irq_auto_0, adc);
645 if (adc->wakeup2_enable)
646 free_irq(adc->irq_auto_1, adc);
647
648 return 0;
649 }
650
651 #ifdef CONFIG_PM_SLEEP
palmas_adc_wakeup_configure(struct palmas_gpadc * adc)652 static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
653 {
654 int adc_period, conv;
655 int i;
656 int ch0 = 0, ch1 = 0;
657 int thres;
658 int ret;
659
660 adc_period = adc->auto_conversion_period;
661 for (i = 0; i < 16; ++i) {
662 if (((1000 * (1 << i)) / 32) >= adc_period)
663 break;
664 }
665 if (i > 0)
666 i--;
667 adc_period = i;
668 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
669 PALMAS_GPADC_AUTO_CTRL,
670 PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK,
671 adc_period);
672 if (ret < 0) {
673 dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
674 return ret;
675 }
676
677 conv = 0;
678 if (adc->wakeup1_enable) {
679 int polarity;
680
681 ch0 = adc->wakeup1_data.adc_channel_number;
682 conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
683 if (adc->wakeup1_data.adc_high_threshold > 0) {
684 thres = adc->wakeup1_data.adc_high_threshold;
685 polarity = 0;
686 } else {
687 thres = adc->wakeup1_data.adc_low_threshold;
688 polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
689 }
690
691 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
692 PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF);
693 if (ret < 0) {
694 dev_err(adc->dev,
695 "THRES_CONV0_LSB write failed: %d\n", ret);
696 return ret;
697 }
698
699 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
700 PALMAS_GPADC_THRES_CONV0_MSB,
701 ((thres >> 8) & 0xF) | polarity);
702 if (ret < 0) {
703 dev_err(adc->dev,
704 "THRES_CONV0_MSB write failed: %d\n", ret);
705 return ret;
706 }
707 }
708
709 if (adc->wakeup2_enable) {
710 int polarity;
711
712 ch1 = adc->wakeup2_data.adc_channel_number;
713 conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
714 if (adc->wakeup2_data.adc_high_threshold > 0) {
715 thres = adc->wakeup2_data.adc_high_threshold;
716 polarity = 0;
717 } else {
718 thres = adc->wakeup2_data.adc_low_threshold;
719 polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
720 }
721
722 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
723 PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF);
724 if (ret < 0) {
725 dev_err(adc->dev,
726 "THRES_CONV1_LSB write failed: %d\n", ret);
727 return ret;
728 }
729
730 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
731 PALMAS_GPADC_THRES_CONV1_MSB,
732 ((thres >> 8) & 0xF) | polarity);
733 if (ret < 0) {
734 dev_err(adc->dev,
735 "THRES_CONV1_MSB write failed: %d\n", ret);
736 return ret;
737 }
738 }
739
740 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
741 PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0);
742 if (ret < 0) {
743 dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
744 return ret;
745 }
746
747 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
748 PALMAS_GPADC_AUTO_CTRL,
749 PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN |
750 PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv);
751 if (ret < 0)
752 dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
753
754 return ret;
755 }
756
palmas_adc_wakeup_reset(struct palmas_gpadc * adc)757 static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc)
758 {
759 int ret;
760
761 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
762 PALMAS_GPADC_AUTO_SELECT, 0);
763 if (ret < 0) {
764 dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
765 return ret;
766 }
767
768 ret = palmas_disable_auto_conversion(adc);
769 if (ret < 0)
770 dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret);
771
772 return ret;
773 }
774
palmas_gpadc_suspend(struct device * dev)775 static int palmas_gpadc_suspend(struct device *dev)
776 {
777 struct iio_dev *indio_dev = dev_get_drvdata(dev);
778 struct palmas_gpadc *adc = iio_priv(indio_dev);
779 int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
780 int ret;
781
782 if (!device_may_wakeup(dev) || !wakeup)
783 return 0;
784
785 ret = palmas_adc_wakeup_configure(adc);
786 if (ret < 0)
787 return ret;
788
789 if (adc->wakeup1_enable)
790 enable_irq_wake(adc->irq_auto_0);
791
792 if (adc->wakeup2_enable)
793 enable_irq_wake(adc->irq_auto_1);
794
795 return 0;
796 }
797
palmas_gpadc_resume(struct device * dev)798 static int palmas_gpadc_resume(struct device *dev)
799 {
800 struct iio_dev *indio_dev = dev_get_drvdata(dev);
801 struct palmas_gpadc *adc = iio_priv(indio_dev);
802 int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
803 int ret;
804
805 if (!device_may_wakeup(dev) || !wakeup)
806 return 0;
807
808 ret = palmas_adc_wakeup_reset(adc);
809 if (ret < 0)
810 return ret;
811
812 if (adc->wakeup1_enable)
813 disable_irq_wake(adc->irq_auto_0);
814
815 if (adc->wakeup2_enable)
816 disable_irq_wake(adc->irq_auto_1);
817
818 return 0;
819 };
820 #endif
821
822 static const struct dev_pm_ops palmas_pm_ops = {
823 SET_SYSTEM_SLEEP_PM_OPS(palmas_gpadc_suspend,
824 palmas_gpadc_resume)
825 };
826
827 static const struct of_device_id of_palmas_gpadc_match_tbl[] = {
828 { .compatible = "ti,palmas-gpadc", },
829 { /* end */ }
830 };
831 MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl);
832
833 static struct platform_driver palmas_gpadc_driver = {
834 .probe = palmas_gpadc_probe,
835 .remove = palmas_gpadc_remove,
836 .driver = {
837 .name = MOD_NAME,
838 .pm = &palmas_pm_ops,
839 .of_match_table = of_palmas_gpadc_match_tbl,
840 },
841 };
842
palmas_gpadc_init(void)843 static int __init palmas_gpadc_init(void)
844 {
845 return platform_driver_register(&palmas_gpadc_driver);
846 }
847 module_init(palmas_gpadc_init);
848
palmas_gpadc_exit(void)849 static void __exit palmas_gpadc_exit(void)
850 {
851 platform_driver_unregister(&palmas_gpadc_driver);
852 }
853 module_exit(palmas_gpadc_exit);
854
855 MODULE_DESCRIPTION("palmas GPADC driver");
856 MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
857 MODULE_ALIAS("platform:palmas-gpadc");
858 MODULE_LICENSE("GPL v2");
859