summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/pmic8xxx-pwrkey.c
blob: 0e818a3d28c53f5904e3936b88f5998fe5df25a6 (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
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/log2.h>
#include <linux/of.h>
#include <linux/of_device.h>

#define PON_CNTL_1 0x1C
#define PON_CNTL_PULL_UP BIT(7)
#define PON_CNTL_TRIG_DELAY_MASK (0x7)
#define PON_CNTL_1_PULL_UP_EN			0xe0
#define PON_CNTL_1_USB_PWR_EN			0x10
#define PON_CNTL_1_WD_EN_RESET			0x08

#define PM8058_SLEEP_CTRL			0x02b
#define PM8921_SLEEP_CTRL			0x10a

#define SLEEP_CTRL_SMPL_EN_RESET		0x04

/* Regulator master enable addresses */
#define REG_PM8058_VREG_EN_MSM			0x018
#define REG_PM8058_VREG_EN_GRP_5_4		0x1c8

/* Regulator control registers for shutdown/reset */
#define PM8058_S0_CTRL				0x004
#define PM8058_S1_CTRL				0x005
#define PM8058_S3_CTRL				0x111
#define PM8058_L21_CTRL				0x120
#define PM8058_L22_CTRL				0x121

#define PM8058_REGULATOR_ENABLE_MASK		0x80
#define PM8058_REGULATOR_ENABLE			0x80
#define PM8058_REGULATOR_DISABLE		0x00
#define PM8058_REGULATOR_PULL_DOWN_MASK		0x40
#define PM8058_REGULATOR_PULL_DOWN_EN		0x40

/* Buck CTRL register */
#define PM8058_SMPS_LEGACY_VREF_SEL		0x20
#define PM8058_SMPS_LEGACY_VPROG_MASK		0x1f
#define PM8058_SMPS_ADVANCED_BAND_MASK		0xC0
#define PM8058_SMPS_ADVANCED_BAND_SHIFT		6
#define PM8058_SMPS_ADVANCED_VPROG_MASK		0x3f

/* Buck TEST2 registers for shutdown/reset */
#define PM8058_S0_TEST2				0x084
#define PM8058_S1_TEST2				0x085
#define PM8058_S3_TEST2				0x11a

#define PM8058_REGULATOR_BANK_WRITE		0x80
#define PM8058_REGULATOR_BANK_MASK		0x70
#define PM8058_REGULATOR_BANK_SHIFT		4
#define PM8058_REGULATOR_BANK_SEL(n)	((n) << PM8058_REGULATOR_BANK_SHIFT)

/* Buck TEST2 register bank 1 */
#define PM8058_SMPS_LEGACY_VLOW_SEL		0x01

/* Buck TEST2 register bank 7 */
#define PM8058_SMPS_ADVANCED_MODE_MASK		0x02
#define PM8058_SMPS_ADVANCED_MODE		0x02
#define PM8058_SMPS_LEGACY_MODE			0x00

/**
 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
 * @key_press_irq: key press irq number
 * @regmap: device regmap
 * @shutdown_fn: shutdown configuration function
 */
struct pmic8xxx_pwrkey {
	int key_press_irq;
	struct regmap *regmap;
	int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
};

static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 1);
	input_sync(pwr);

	return IRQ_HANDLED;
}

static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 0);
	input_sync(pwr);

	return IRQ_HANDLED;
}

static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(pwrkey->key_press_irq);

	return 0;
}

static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
{
	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(pwrkey->key_press_irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);

static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
{
	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
	int error;
	u8 mask, val;
	bool reset = system_state == SYSTEM_RESTART;

	if (pwrkey->shutdown_fn) {
		error = pwrkey->shutdown_fn(pwrkey, reset);
		if (error)
			return;
	}

	/*
	 * Select action to perform (reset or shutdown) when PS_HOLD goes low.
	 * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
	 * USB charging is enabled.
	 */
	mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
	mask |= PON_CNTL_1_WD_EN_RESET;
	val = mask;
	if (!reset)
		val &= ~PON_CNTL_1_WD_EN_RESET;

	regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
}

/*
 * Set an SMPS regulator to be disabled in its CTRL register, but enabled
 * in the master enable register.  Also set it's pull down enable bit.
 * Take care to make sure that the output voltage doesn't change if switching
 * from advanced mode to legacy mode.
 */
static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
	u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
	u8 master_enable_bit)
{
	int error;
	u8 vref_sel, vlow_sel, band, vprog, bank;
	unsigned int reg;

	bank = PM8058_REGULATOR_BANK_SEL(7);
	error = regmap_write(regmap, test2_addr, bank);
	if (error)
		return error;

	error = regmap_read(regmap, test2_addr, &reg);
	if (error)
		return error;

	reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
	/* Check if in advanced mode. */
	if (reg == PM8058_SMPS_ADVANCED_MODE) {
		/* Determine current output voltage. */
		error = regmap_read(regmap, ctrl_addr, &reg);
		if (error)
			return error;

		band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
		band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
		switch (band) {
		case 3:
			vref_sel = 0;
			vlow_sel = 0;
			break;
		case 2:
			vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
			vlow_sel = 0;
			break;
		case 1:
			vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
			vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
			break;
		default:
			pr_err("%s: regulator already disabled\n", __func__);
			return -EPERM;
		}
		vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
		/* Round up if fine step is in use. */
		vprog = (vprog + 1) >> 1;
		if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
			vprog = PM8058_SMPS_LEGACY_VPROG_MASK;

		/* Set VLOW_SEL bit. */
		bank = PM8058_REGULATOR_BANK_SEL(1);
		error = regmap_write(regmap, test2_addr, bank);
		if (error)
			return error;

		error = regmap_update_bits(regmap, test2_addr,
			PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
				| PM8058_SMPS_LEGACY_VLOW_SEL,
			PM8058_REGULATOR_BANK_WRITE |
			PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
		if (error)
			return error;

		/* Switch to legacy mode */
		bank = PM8058_REGULATOR_BANK_SEL(7);
		error = regmap_write(regmap, test2_addr, bank);
		if (error)
			return error;

		error = regmap_update_bits(regmap, test2_addr,
				PM8058_REGULATOR_BANK_WRITE |
				PM8058_REGULATOR_BANK_MASK |
				PM8058_SMPS_ADVANCED_MODE_MASK,
				PM8058_REGULATOR_BANK_WRITE |
				PM8058_REGULATOR_BANK_SEL(7) |
				PM8058_SMPS_LEGACY_MODE);
		if (error)
			return error;

		/* Enable locally, enable pull down, keep voltage the same. */
		error = regmap_update_bits(regmap, ctrl_addr,
			PM8058_REGULATOR_ENABLE_MASK |
			PM8058_REGULATOR_PULL_DOWN_MASK |
			PM8058_SMPS_LEGACY_VREF_SEL |
			PM8058_SMPS_LEGACY_VPROG_MASK,
			PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
				| vref_sel | vprog);
		if (error)
			return error;
	}

	/* Enable in master control register. */
	error = regmap_update_bits(regmap, master_enable_addr,
			master_enable_bit, master_enable_bit);
	if (error)
		return error;

	/* Disable locally and enable pull down. */
	return regmap_update_bits(regmap, ctrl_addr,
		PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
		PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
}

static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
		u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
{
	int error;

	/* Enable LDO in master control register. */
	error = regmap_update_bits(regmap, master_enable_addr,
			master_enable_bit, master_enable_bit);
	if (error)
		return error;

	/* Disable LDO in CTRL register and set pull down */
	return regmap_update_bits(regmap, ctrl_addr,
		PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
		PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
}

static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
{
	int error;
	struct regmap *regmap = pwrkey->regmap;
	u8 mask, val;

	/* When shutting down, enable active pulldowns on important rails. */
	if (!reset) {
		/* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
		pm8058_disable_smps_locally_set_pull_down(regmap,
			PM8058_S0_CTRL, PM8058_S0_TEST2,
			REG_PM8058_VREG_EN_MSM, BIT(7));
		pm8058_disable_smps_locally_set_pull_down(regmap,
			PM8058_S1_CTRL, PM8058_S1_TEST2,
			REG_PM8058_VREG_EN_MSM, BIT(6));
		pm8058_disable_smps_locally_set_pull_down(regmap,
			PM8058_S3_CTRL, PM8058_S3_TEST2,
			REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
		/* Disable LDO 21 locally and set pulldown enable bit. */
		pm8058_disable_ldo_locally_set_pull_down(regmap,
			PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
			BIT(1));
	}

	/*
	 * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
	 * pull-down state intact. This ensures a safe shutdown.
	 */
	error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
	if (error)
		return error;

	/* Enable SMPL if resetting is desired */
	mask = SLEEP_CTRL_SMPL_EN_RESET;
	val = 0;
	if (reset)
		val = mask;
	return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
}

static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
{
	struct regmap *regmap = pwrkey->regmap;
	u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
	u8 val = 0;

	/* Enable SMPL if resetting is desired */
	if (reset)
		val = mask;
	return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
}

static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
{
	struct input_dev *pwr;
	int key_release_irq = platform_get_irq(pdev, 0);
	int key_press_irq = platform_get_irq(pdev, 1);
	int err;
	unsigned int delay;
	unsigned int pon_cntl;
	struct regmap *regmap;
	struct pmic8xxx_pwrkey *pwrkey;
	u32 kpd_delay;
	bool pull_up;

	if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
		kpd_delay = 15625;

	/* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
	if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
		dev_err(&pdev->dev, "invalid power key trigger delay\n");
		return -EINVAL;
	}

	pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");

	regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!regmap) {
		dev_err(&pdev->dev, "failed to locate regmap for the device\n");
		return -ENODEV;
	}

	pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
	if (!pwrkey)
		return -ENOMEM;

	pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
	pwrkey->regmap = regmap;
	pwrkey->key_press_irq = key_press_irq;

	pwr = devm_input_allocate_device(&pdev->dev);
	if (!pwr) {
		dev_dbg(&pdev->dev, "Can't allocate power button\n");
		return -ENOMEM;
	}

	input_set_capability(pwr, EV_KEY, KEY_POWER);

	pwr->name = "pmic8xxx_pwrkey";
	pwr->phys = "pmic8xxx_pwrkey/input0";

	delay = (kpd_delay << 6) / USEC_PER_SEC;
	delay = ilog2(delay);

	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
		return err;
	}

	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
	if (pull_up)
		pon_cntl |= PON_CNTL_PULL_UP;
	else
		pon_cntl &= ~PON_CNTL_PULL_UP;

	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
		return err;
	}

	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
			       IRQF_TRIGGER_RISING,
			       "pmic8xxx_pwrkey_press", pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
			key_press_irq, err);
		return err;
	}

	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
			       IRQF_TRIGGER_RISING,
			       "pmic8xxx_pwrkey_release", pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
			key_release_irq, err);
		return err;
	}

	err = input_register_device(pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't register power key: %d\n", err);
		return err;
	}

	platform_set_drvdata(pdev, pwrkey);
	device_init_wakeup(&pdev->dev, 1);

	return 0;
}

static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
	{ .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
	{ .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
	{ }
};
MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);

static struct platform_driver pmic8xxx_pwrkey_driver = {
	.probe		= pmic8xxx_pwrkey_probe,
	.shutdown	= pmic8xxx_pwrkey_shutdown,
	.driver		= {
		.name	= "pm8xxx-pwrkey",
		.pm	= &pm8xxx_pwr_key_pm_ops,
		.of_match_table = pm8xxx_pwr_key_id_table,
	},
};
module_platform_driver(pmic8xxx_pwrkey_driver);

MODULE_ALIAS("platform:pmic8xxx_pwrkey");
MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");