summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
blob: b2d22218a2582f94b2c5d0274843fa0c2d3d7162 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
/*
 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>

#include "../core.h"
#include "../pinctrl-utils.h"

#define PMIC_GPIO_ADDRESS_RANGE			0x100

/* type and subtype registers base address offsets */
#define PMIC_GPIO_REG_TYPE			0x4
#define PMIC_GPIO_REG_SUBTYPE			0x5

/* GPIO peripheral type and subtype out_values */
#define PMIC_GPIO_TYPE				0x10
#define PMIC_GPIO_SUBTYPE_GPIO_4CH		0x1
#define PMIC_GPIO_SUBTYPE_GPIOC_4CH		0x5
#define PMIC_GPIO_SUBTYPE_GPIO_8CH		0x9
#define PMIC_GPIO_SUBTYPE_GPIOC_8CH		0xd

#define PMIC_MPP_REG_RT_STS			0x10
#define PMIC_MPP_REG_RT_STS_VAL_MASK		0x1

/* control register base address offsets */
#define PMIC_GPIO_REG_MODE_CTL			0x40
#define PMIC_GPIO_REG_DIG_VIN_CTL		0x41
#define PMIC_GPIO_REG_DIG_PULL_CTL		0x42
#define PMIC_GPIO_REG_DIG_OUT_CTL		0x45
#define PMIC_GPIO_REG_EN_CTL			0x46

/* PMIC_GPIO_REG_MODE_CTL */
#define PMIC_GPIO_REG_MODE_VALUE_SHIFT		0x1
#define PMIC_GPIO_REG_MODE_FUNCTION_SHIFT	1
#define PMIC_GPIO_REG_MODE_FUNCTION_MASK	0x7
#define PMIC_GPIO_REG_MODE_DIR_SHIFT		4
#define PMIC_GPIO_REG_MODE_DIR_MASK		0x7

/* PMIC_GPIO_REG_DIG_VIN_CTL */
#define PMIC_GPIO_REG_VIN_SHIFT			0
#define PMIC_GPIO_REG_VIN_MASK			0x7

/* PMIC_GPIO_REG_DIG_PULL_CTL */
#define PMIC_GPIO_REG_PULL_SHIFT		0
#define PMIC_GPIO_REG_PULL_MASK			0x7

#define PMIC_GPIO_PULL_DOWN			4
#define PMIC_GPIO_PULL_DISABLE			5

/* PMIC_GPIO_REG_DIG_OUT_CTL */
#define PMIC_GPIO_REG_OUT_STRENGTH_SHIFT	0
#define PMIC_GPIO_REG_OUT_STRENGTH_MASK		0x3
#define PMIC_GPIO_REG_OUT_TYPE_SHIFT		4
#define PMIC_GPIO_REG_OUT_TYPE_MASK		0x3

/*
 * Output type - indicates pin should be configured as push-pull,
 * open drain or open source.
 */
#define PMIC_GPIO_OUT_BUF_CMOS			0
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS	1
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS	2

/* PMIC_GPIO_REG_EN_CTL */
#define PMIC_GPIO_REG_MASTER_EN_SHIFT		7

#define PMIC_GPIO_PHYSICAL_OFFSET		1

/* Qualcomm specific pin configurations */
#define PMIC_GPIO_CONF_PULL_UP			(PIN_CONFIG_END + 1)
#define PMIC_GPIO_CONF_STRENGTH			(PIN_CONFIG_END + 2)

/**
 * struct pmic_gpio_pad - keep current GPIO settings
 * @base: Address base in SPMI device.
 * @irq: IRQ number which this GPIO generate.
 * @is_enabled: Set to false when GPIO should be put in high Z state.
 * @out_value: Cached pin output value
 * @have_buffer: Set to true if GPIO output could be configured in push-pull,
 *	open-drain or open-source mode.
 * @output_enabled: Set to true if GPIO output logic is enabled.
 * @input_enabled: Set to true if GPIO input buffer logic is enabled.
 * @num_sources: Number of power-sources supported by this GPIO.
 * @power_source: Current power-source used.
 * @buffer_type: Push-pull, open-drain or open-source.
 * @pullup: Constant current which flow trough GPIO output buffer.
 * @strength: No, Low, Medium, High
 * @function: See pmic_gpio_functions[]
 */
struct pmic_gpio_pad {
	u16		base;
	int		irq;
	bool		is_enabled;
	bool		out_value;
	bool		have_buffer;
	bool		output_enabled;
	bool		input_enabled;
	unsigned int	num_sources;
	unsigned int	power_source;
	unsigned int	buffer_type;
	unsigned int	pullup;
	unsigned int	strength;
	unsigned int	function;
};

struct pmic_gpio_state {
	struct device	*dev;
	struct regmap	*map;
	struct pinctrl_dev *ctrl;
	struct gpio_chip chip;
};

static const struct pinconf_generic_params pmic_gpio_bindings[] = {
	{"qcom,pull-up-strength",	PMIC_GPIO_CONF_PULL_UP,		0},
	{"qcom,drive-strength",		PMIC_GPIO_CONF_STRENGTH,	0},
};

#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item pmic_conf_items[ARRAY_SIZE(pmic_gpio_bindings)] = {
	PCONFDUMP(PMIC_GPIO_CONF_PULL_UP,  "pull up strength", NULL, true),
	PCONFDUMP(PMIC_GPIO_CONF_STRENGTH, "drive-strength", NULL, true),
};
#endif

static const char *const pmic_gpio_groups[] = {
	"gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", "gpio8",
	"gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15",
	"gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22",
	"gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29",
	"gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35", "gpio36",
};

static const char *const pmic_gpio_functions[] = {
	PMIC_GPIO_FUNC_NORMAL, PMIC_GPIO_FUNC_PAIRED,
	PMIC_GPIO_FUNC_FUNC1, PMIC_GPIO_FUNC_FUNC2,
	PMIC_GPIO_FUNC_DTEST1, PMIC_GPIO_FUNC_DTEST2,
	PMIC_GPIO_FUNC_DTEST3, PMIC_GPIO_FUNC_DTEST4,
};

static inline struct pmic_gpio_state *to_gpio_state(struct gpio_chip *chip)
{
	return container_of(chip, struct pmic_gpio_state, chip);
};

static int pmic_gpio_read(struct pmic_gpio_state *state,
			  struct pmic_gpio_pad *pad, unsigned int addr)
{
	unsigned int val;
	int ret;

	ret = regmap_read(state->map, pad->base + addr, &val);
	if (ret < 0)
		dev_err(state->dev, "read 0x%x failed\n", addr);
	else
		ret = val;

	return ret;
}

static int pmic_gpio_write(struct pmic_gpio_state *state,
			   struct pmic_gpio_pad *pad, unsigned int addr,
			   unsigned int val)
{
	int ret;

	ret = regmap_write(state->map, pad->base + addr, val);
	if (ret < 0)
		dev_err(state->dev, "write 0x%x failed\n", addr);

	return ret;
}

static int pmic_gpio_get_groups_count(struct pinctrl_dev *pctldev)
{
	/* Every PIN is a group */
	return pctldev->desc->npins;
}

static const char *pmic_gpio_get_group_name(struct pinctrl_dev *pctldev,
					    unsigned pin)
{
	return pctldev->desc->pins[pin].name;
}

static int pmic_gpio_get_group_pins(struct pinctrl_dev *pctldev, unsigned pin,
				    const unsigned **pins, unsigned *num_pins)
{
	*pins = &pctldev->desc->pins[pin].number;
	*num_pins = 1;
	return 0;
}

static const struct pinctrl_ops pmic_gpio_pinctrl_ops = {
	.get_groups_count	= pmic_gpio_get_groups_count,
	.get_group_name		= pmic_gpio_get_group_name,
	.get_group_pins		= pmic_gpio_get_group_pins,
	.dt_node_to_map		= pinconf_generic_dt_node_to_map_group,
	.dt_free_map		= pinctrl_utils_dt_free_map,
};

static int pmic_gpio_get_functions_count(struct pinctrl_dev *pctldev)
{
	return ARRAY_SIZE(pmic_gpio_functions);
}

static const char *pmic_gpio_get_function_name(struct pinctrl_dev *pctldev,
					       unsigned function)
{
	return pmic_gpio_functions[function];
}

static int pmic_gpio_get_function_groups(struct pinctrl_dev *pctldev,
					 unsigned function,
					 const char *const **groups,
					 unsigned *const num_qgroups)
{
	*groups = pmic_gpio_groups;
	*num_qgroups = pctldev->desc->npins;
	return 0;
}

static int pmic_gpio_set_mux(struct pinctrl_dev *pctldev, unsigned function,
				unsigned pin)
{
	struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
	struct pmic_gpio_pad *pad;
	unsigned int val;
	int ret;

	pad = pctldev->desc->pins[pin].drv_data;

	pad->function = function;

	val = 0;
	if (pad->output_enabled) {
		if (pad->input_enabled)
			val = 2;
		else
			val = 1;
	}

	val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
	val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

	ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val);
	if (ret < 0)
		return ret;

	val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT;

	return pmic_gpio_write(state, pad, PMIC_GPIO_REG_EN_CTL, val);
}

static const struct pinmux_ops pmic_gpio_pinmux_ops = {
	.get_functions_count	= pmic_gpio_get_functions_count,
	.get_function_name	= pmic_gpio_get_function_name,
	.get_function_groups	= pmic_gpio_get_function_groups,
	.set_mux		= pmic_gpio_set_mux,
};

static int pmic_gpio_config_get(struct pinctrl_dev *pctldev,
				unsigned int pin, unsigned long *config)
{
	unsigned param = pinconf_to_config_param(*config);
	struct pmic_gpio_pad *pad;
	unsigned arg;

	pad = pctldev->desc->pins[pin].drv_data;

	switch (param) {
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_CMOS;
		break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS;
		break;
	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
		arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS;
		break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
		arg = pad->pullup == PMIC_GPIO_PULL_DOWN;
		break;
	case PIN_CONFIG_BIAS_DISABLE:
		arg = pad->pullup = PMIC_GPIO_PULL_DISABLE;
		break;
	case PIN_CONFIG_BIAS_PULL_UP:
		arg = pad->pullup == PMIC_GPIO_PULL_UP_30;
		break;
	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
		arg = !pad->is_enabled;
		break;
	case PIN_CONFIG_POWER_SOURCE:
		arg = pad->power_source;
		break;
	case PIN_CONFIG_INPUT_ENABLE:
		arg = pad->input_enabled;
		break;
	case PIN_CONFIG_OUTPUT:
		arg = pad->out_value;
		break;
	case PMIC_GPIO_CONF_PULL_UP:
		arg = pad->pullup;
		break;
	case PMIC_GPIO_CONF_STRENGTH:
		arg = pad->strength;
		break;
	default:
		return -EINVAL;
	}

	*config = pinconf_to_config_packed(param, arg);
	return 0;
}

static int pmic_gpio_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
				unsigned long *configs, unsigned nconfs)
{
	struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
	struct pmic_gpio_pad *pad;
	unsigned param, arg;
	unsigned int val;
	int i, ret;

	pad = pctldev->desc->pins[pin].drv_data;

	for (i = 0; i < nconfs; i++) {
		param = pinconf_to_config_param(configs[i]);
		arg = pinconf_to_config_argument(configs[i]);

		switch (param) {
		case PIN_CONFIG_DRIVE_PUSH_PULL:
			pad->buffer_type = PMIC_GPIO_OUT_BUF_CMOS;
			break;
		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
			if (!pad->have_buffer)
				return -EINVAL;
			pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS;
			break;
		case PIN_CONFIG_DRIVE_OPEN_SOURCE:
			if (!pad->have_buffer)
				return -EINVAL;
			pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS;
			break;
		case PIN_CONFIG_BIAS_DISABLE:
			pad->pullup = PMIC_GPIO_PULL_DISABLE;
			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			pad->pullup = PMIC_GPIO_PULL_UP_30;
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			if (arg)
				pad->pullup = PMIC_GPIO_PULL_DOWN;
			else
				pad->pullup = PMIC_GPIO_PULL_DISABLE;
			break;
		case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
			pad->is_enabled = false;
			break;
		case PIN_CONFIG_POWER_SOURCE:
			if (arg > pad->num_sources)
				return -EINVAL;
			pad->power_source = arg;
			break;
		case PIN_CONFIG_INPUT_ENABLE:
			pad->input_enabled = arg ? true : false;
			break;
		case PIN_CONFIG_OUTPUT:
			pad->output_enabled = true;
			pad->out_value = arg;
			break;
		case PMIC_GPIO_CONF_PULL_UP:
			if (arg > PMIC_GPIO_PULL_UP_1P5_30)
				return -EINVAL;
			pad->pullup = arg;
			break;
		case PMIC_GPIO_CONF_STRENGTH:
			if (arg > PMIC_GPIO_STRENGTH_LOW)
				return -EINVAL;
			pad->strength = arg;
			break;
		default:
			return -EINVAL;
		}
	}

	val = pad->power_source << PMIC_GPIO_REG_VIN_SHIFT;

	ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL, val);
	if (ret < 0)
		return ret;

	val = pad->pullup << PMIC_GPIO_REG_PULL_SHIFT;

	ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL, val);
	if (ret < 0)
		return ret;

	val = pad->buffer_type << PMIC_GPIO_REG_OUT_TYPE_SHIFT;
	val = pad->strength << PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;

	ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL, val);
	if (ret < 0)
		return ret;

	val = 0;
	if (pad->output_enabled) {
		if (pad->input_enabled)
			val = 2;
		else
			val = 1;
	}

	val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT;
	val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
	val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

	return pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val);
}

static void pmic_gpio_config_dbg_show(struct pinctrl_dev *pctldev,
				      struct seq_file *s, unsigned pin)
{
	struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
	struct pmic_gpio_pad *pad;
	int ret, val;

	static const char *const biases[] = {
		"pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA",
		"pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull"
	};
	static const char *const buffer_types[] = {
		"push-pull", "open-drain", "open-source"
	};
	static const char *const strengths[] = {
		"no", "high", "medium", "low"
	};

	pad = pctldev->desc->pins[pin].drv_data;

	seq_printf(s, " gpio%-2d:", pin + PMIC_GPIO_PHYSICAL_OFFSET);

	val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_EN_CTL);

	if (val < 0 || !(val >> PMIC_GPIO_REG_MASTER_EN_SHIFT)) {
		seq_puts(s, " ---");
	} else {

		if (!pad->input_enabled) {
			ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS);
			if (!ret) {
				ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
				pad->out_value = ret;
			}
		}

		seq_printf(s, " %-4s", pad->output_enabled ? "out" : "in");
		seq_printf(s, " %-7s", pmic_gpio_functions[pad->function]);
		seq_printf(s, " vin-%d", pad->power_source);
		seq_printf(s, " %-27s", biases[pad->pullup]);
		seq_printf(s, " %-10s", buffer_types[pad->buffer_type]);
		seq_printf(s, " %-4s", pad->out_value ? "high" : "low");
		seq_printf(s, " %-7s", strengths[pad->strength]);
	}
}

static const struct pinconf_ops pmic_gpio_pinconf_ops = {
	.is_generic			= true,
	.pin_config_group_get		= pmic_gpio_config_get,
	.pin_config_group_set		= pmic_gpio_config_set,
	.pin_config_group_dbg_show	= pmic_gpio_config_dbg_show,
};

static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	unsigned long config;

	config = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1);

	return pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}

static int pmic_gpio_direction_output(struct gpio_chip *chip,
				      unsigned pin, int val)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	unsigned long config;

	config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, val);

	return pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}

static int pmic_gpio_get(struct gpio_chip *chip, unsigned pin)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	struct pmic_gpio_pad *pad;
	int ret;

	pad = state->ctrl->desc->pins[pin].drv_data;

	if (!pad->is_enabled)
		return -EINVAL;

	if (pad->input_enabled) {
		ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS);
		if (ret < 0)
			return ret;

		pad->out_value = ret & PMIC_MPP_REG_RT_STS_VAL_MASK;
	}

	return pad->out_value;
}

static void pmic_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	unsigned long config;

	config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, value);

	pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}

static int pmic_gpio_request(struct gpio_chip *chip, unsigned base)
{
	return pinctrl_request_gpio(chip->base + base);
}

static void pmic_gpio_free(struct gpio_chip *chip, unsigned base)
{
	pinctrl_free_gpio(chip->base + base);
}

static int pmic_gpio_of_xlate(struct gpio_chip *chip,
			      const struct of_phandle_args *gpio_desc,
			      u32 *flags)
{
	if (chip->of_gpio_n_cells < 2)
		return -EINVAL;

	if (flags)
		*flags = gpio_desc->args[1];

	return gpio_desc->args[0] - PMIC_GPIO_PHYSICAL_OFFSET;
}

static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	struct pmic_gpio_pad *pad;

	pad = state->ctrl->desc->pins[pin].drv_data;

	return pad->irq;
}

static void pmic_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct pmic_gpio_state *state = to_gpio_state(chip);
	unsigned i;

	for (i = 0; i < chip->ngpio; i++) {
		pmic_gpio_config_dbg_show(state->ctrl, s, i);
		seq_puts(s, "\n");
	}
}

static const struct gpio_chip pmic_gpio_gpio_template = {
	.direction_input	= pmic_gpio_direction_input,
	.direction_output	= pmic_gpio_direction_output,
	.get			= pmic_gpio_get,
	.set			= pmic_gpio_set,
	.request		= pmic_gpio_request,
	.free			= pmic_gpio_free,
	.of_xlate		= pmic_gpio_of_xlate,
	.to_irq			= pmic_gpio_to_irq,
	.dbg_show		= pmic_gpio_dbg_show,
};

static int pmic_gpio_populate(struct pmic_gpio_state *state,
			      struct pmic_gpio_pad *pad)
{
	int type, subtype, val, dir;

	type = pmic_gpio_read(state, pad, PMIC_GPIO_REG_TYPE);
	if (type < 0)
		return type;

	if (type != PMIC_GPIO_TYPE) {
		dev_err(state->dev, "incorrect block type 0x%x at 0x%x\n",
			type, pad->base);
		return -ENODEV;
	}

	subtype = pmic_gpio_read(state, pad, PMIC_GPIO_REG_SUBTYPE);
	if (subtype < 0)
		return subtype;

	switch (subtype) {
	case PMIC_GPIO_SUBTYPE_GPIO_4CH:
		pad->have_buffer = true;
	case PMIC_GPIO_SUBTYPE_GPIOC_4CH:
		pad->num_sources = 4;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_8CH:
		pad->have_buffer = true;
	case PMIC_GPIO_SUBTYPE_GPIOC_8CH:
		pad->num_sources = 8;
		break;
	default:
		dev_err(state->dev, "unknown GPIO type 0x%x\n", subtype);
		return -ENODEV;
	}

	val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_MODE_CTL);
	if (val < 0)
		return val;

	pad->out_value = val & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

	dir = val >> PMIC_GPIO_REG_MODE_DIR_SHIFT;
	dir &= PMIC_GPIO_REG_MODE_DIR_MASK;
	switch (dir) {
	case 0:
		pad->input_enabled = true;
		pad->output_enabled = false;
		break;
	case 1:
		pad->input_enabled = false;
		pad->output_enabled = true;
		break;
	case 2:
		pad->input_enabled = true;
		pad->output_enabled = true;
		break;
	default:
		dev_err(state->dev, "unknown GPIO direction\n");
		return -ENODEV;
	}

	pad->function = val >> PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
	pad->function &= PMIC_GPIO_REG_MODE_FUNCTION_MASK;

	val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL);
	if (val < 0)
		return val;

	pad->power_source = val >> PMIC_GPIO_REG_VIN_SHIFT;
	pad->power_source &= PMIC_GPIO_REG_VIN_MASK;

	val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL);
	if (val < 0)
		return val;

	pad->pullup = val >> PMIC_GPIO_REG_PULL_SHIFT;
	pad->pullup &= PMIC_GPIO_REG_PULL_MASK;

	val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL);
	if (val < 0)
		return val;

	pad->strength = val >> PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;
	pad->strength &= PMIC_GPIO_REG_OUT_STRENGTH_MASK;

	pad->buffer_type = val >> PMIC_GPIO_REG_OUT_TYPE_SHIFT;
	pad->buffer_type &= PMIC_GPIO_REG_OUT_TYPE_MASK;

	/* Pin could be disabled with PIN_CONFIG_BIAS_HIGH_IMPEDANCE */
	pad->is_enabled = true;
	return 0;
}

static int pmic_gpio_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pinctrl_pin_desc *pindesc;
	struct pinctrl_desc *pctrldesc;
	struct pmic_gpio_pad *pad, *pads;
	struct pmic_gpio_state *state;
	int ret, npins, i;
	u32 res[2];

	ret = of_property_read_u32_array(dev->of_node, "reg", res, 2);
	if (ret < 0) {
		dev_err(dev, "missing base address and/or range");
		return ret;
	}

	npins = res[1] / PMIC_GPIO_ADDRESS_RANGE;

	if (!npins)
		return -EINVAL;

	BUG_ON(npins > ARRAY_SIZE(pmic_gpio_groups));

	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
	if (!state)
		return -ENOMEM;

	platform_set_drvdata(pdev, state);

	state->dev = &pdev->dev;
	state->map = dev_get_regmap(dev->parent, NULL);

	pindesc = devm_kcalloc(dev, npins, sizeof(*pindesc), GFP_KERNEL);
	if (!pindesc)
		return -ENOMEM;

	pads = devm_kcalloc(dev, npins, sizeof(*pads), GFP_KERNEL);
	if (!pads)
		return -ENOMEM;

	pctrldesc = devm_kzalloc(dev, sizeof(*pctrldesc), GFP_KERNEL);
	if (!pctrldesc)
		return -ENOMEM;

	pctrldesc->pctlops = &pmic_gpio_pinctrl_ops;
	pctrldesc->pmxops = &pmic_gpio_pinmux_ops;
	pctrldesc->confops = &pmic_gpio_pinconf_ops;
	pctrldesc->owner = THIS_MODULE;
	pctrldesc->name = dev_name(dev);
	pctrldesc->pins = pindesc;
	pctrldesc->npins = npins;
	pctrldesc->num_custom_params = ARRAY_SIZE(pmic_gpio_bindings);
	pctrldesc->custom_params = pmic_gpio_bindings;
#ifdef CONFIG_DEBUG_FS
	pctrldesc->custom_conf_items = pmic_conf_items;
#endif

	for (i = 0; i < npins; i++, pindesc++) {
		pad = &pads[i];
		pindesc->drv_data = pad;
		pindesc->number = i;
		pindesc->name = pmic_gpio_groups[i];

		pad->irq = platform_get_irq(pdev, i);
		if (pad->irq < 0)
			return pad->irq;

		pad->base = res[0] + i * PMIC_GPIO_ADDRESS_RANGE;

		ret = pmic_gpio_populate(state, pad);
		if (ret < 0)
			return ret;
	}

	state->chip = pmic_gpio_gpio_template;
	state->chip.dev = dev;
	state->chip.base = -1;
	state->chip.ngpio = npins;
	state->chip.label = dev_name(dev);
	state->chip.of_gpio_n_cells = 2;
	state->chip.can_sleep = false;

	state->ctrl = pinctrl_register(pctrldesc, dev, state);
	if (!state->ctrl)
		return -ENODEV;

	ret = gpiochip_add(&state->chip);
	if (ret) {
		dev_err(state->dev, "can't add gpio chip\n");
		goto err_chip;
	}

	ret = gpiochip_add_pin_range(&state->chip, dev_name(dev), 0, 0, npins);
	if (ret) {
		dev_err(dev, "failed to add pin range\n");
		goto err_range;
	}

	return 0;

err_range:
	gpiochip_remove(&state->chip);
err_chip:
	pinctrl_unregister(state->ctrl);
	return ret;
}

static int pmic_gpio_remove(struct platform_device *pdev)
{
	struct pmic_gpio_state *state = platform_get_drvdata(pdev);

	gpiochip_remove(&state->chip);
	pinctrl_unregister(state->ctrl);
	return 0;
}

static const struct of_device_id pmic_gpio_of_match[] = {
	{ .compatible = "qcom,pm8916-gpio" },	/* 4 GPIO's */
	{ .compatible = "qcom,pm8941-gpio" },	/* 36 GPIO's */
	{ .compatible = "qcom,pma8084-gpio" },	/* 22 GPIO's */
	{ },
};

MODULE_DEVICE_TABLE(of, pmic_gpio_of_match);

static struct platform_driver pmic_gpio_driver = {
	.driver = {
		   .name = "qcom-spmi-gpio",
		   .of_match_table = pmic_gpio_of_match,
	},
	.probe	= pmic_gpio_probe,
	.remove = pmic_gpio_remove,
};

module_platform_driver(pmic_gpio_driver);

MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
MODULE_DESCRIPTION("Qualcomm SPMI PMIC GPIO pin control driver");
MODULE_ALIAS("platform:qcom-spmi-gpio");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud