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13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/input.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21#include <linux/log2.h>
22#include <linux/of.h>
23#include <linux/of_device.h>
24
25#define PON_CNTL_1 0x1C
26#define PON_CNTL_PULL_UP BIT(7)
27#define PON_CNTL_TRIG_DELAY_MASK (0x7)
28#define PON_CNTL_1_PULL_UP_EN 0xe0
29#define PON_CNTL_1_USB_PWR_EN 0x10
30#define PON_CNTL_1_WD_EN_RESET 0x08
31
32#define PM8058_SLEEP_CTRL 0x02b
33#define PM8921_SLEEP_CTRL 0x10a
34
35#define SLEEP_CTRL_SMPL_EN_RESET 0x04
36
37
38#define REG_PM8058_VREG_EN_MSM 0x018
39#define REG_PM8058_VREG_EN_GRP_5_4 0x1c8
40
41
42#define PM8058_S0_CTRL 0x004
43#define PM8058_S1_CTRL 0x005
44#define PM8058_S3_CTRL 0x111
45#define PM8058_L21_CTRL 0x120
46#define PM8058_L22_CTRL 0x121
47
48#define PM8058_REGULATOR_ENABLE_MASK 0x80
49#define PM8058_REGULATOR_ENABLE 0x80
50#define PM8058_REGULATOR_DISABLE 0x00
51#define PM8058_REGULATOR_PULL_DOWN_MASK 0x40
52#define PM8058_REGULATOR_PULL_DOWN_EN 0x40
53
54
55#define PM8058_SMPS_LEGACY_VREF_SEL 0x20
56#define PM8058_SMPS_LEGACY_VPROG_MASK 0x1f
57#define PM8058_SMPS_ADVANCED_BAND_MASK 0xC0
58#define PM8058_SMPS_ADVANCED_BAND_SHIFT 6
59#define PM8058_SMPS_ADVANCED_VPROG_MASK 0x3f
60
61
62#define PM8058_S0_TEST2 0x084
63#define PM8058_S1_TEST2 0x085
64#define PM8058_S3_TEST2 0x11a
65
66#define PM8058_REGULATOR_BANK_WRITE 0x80
67#define PM8058_REGULATOR_BANK_MASK 0x70
68#define PM8058_REGULATOR_BANK_SHIFT 4
69#define PM8058_REGULATOR_BANK_SEL(n) ((n) << PM8058_REGULATOR_BANK_SHIFT)
70
71
72#define PM8058_SMPS_LEGACY_VLOW_SEL 0x01
73
74
75#define PM8058_SMPS_ADVANCED_MODE_MASK 0x02
76#define PM8058_SMPS_ADVANCED_MODE 0x02
77#define PM8058_SMPS_LEGACY_MODE 0x00
78
79
80
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82
83
84
85struct pmic8xxx_pwrkey {
86 int key_press_irq;
87 struct regmap *regmap;
88 int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
89};
90
91static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
92{
93 struct input_dev *pwr = _pwr;
94
95 input_report_key(pwr, KEY_POWER, 1);
96 input_sync(pwr);
97
98 return IRQ_HANDLED;
99}
100
101static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
102{
103 struct input_dev *pwr = _pwr;
104
105 input_report_key(pwr, KEY_POWER, 0);
106 input_sync(pwr);
107
108 return IRQ_HANDLED;
109}
110
111static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
112{
113 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
114
115 if (device_may_wakeup(dev))
116 enable_irq_wake(pwrkey->key_press_irq);
117
118 return 0;
119}
120
121static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
122{
123 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
124
125 if (device_may_wakeup(dev))
126 disable_irq_wake(pwrkey->key_press_irq);
127
128 return 0;
129}
130
131static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
132 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
133
134static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
135{
136 struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
137 int error;
138 u8 mask, val;
139 bool reset = system_state == SYSTEM_RESTART;
140
141 if (pwrkey->shutdown_fn) {
142 error = pwrkey->shutdown_fn(pwrkey, reset);
143 if (error)
144 return;
145 }
146
147
148
149
150
151
152 mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
153 mask |= PON_CNTL_1_WD_EN_RESET;
154 val = mask;
155 if (!reset)
156 val &= ~PON_CNTL_1_WD_EN_RESET;
157
158 regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
159}
160
161
162
163
164
165
166
167static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
168 u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
169 u8 master_enable_bit)
170{
171 int error;
172 u8 vref_sel, vlow_sel, band, vprog, bank;
173 unsigned int reg;
174
175 bank = PM8058_REGULATOR_BANK_SEL(7);
176 error = regmap_write(regmap, test2_addr, bank);
177 if (error)
178 return error;
179
180 error = regmap_read(regmap, test2_addr, ®);
181 if (error)
182 return error;
183
184 reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
185
186 if (reg == PM8058_SMPS_ADVANCED_MODE) {
187
188 error = regmap_read(regmap, ctrl_addr, ®);
189 if (error)
190 return error;
191
192 band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
193 band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
194 switch (band) {
195 case 3:
196 vref_sel = 0;
197 vlow_sel = 0;
198 break;
199 case 2:
200 vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
201 vlow_sel = 0;
202 break;
203 case 1:
204 vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
205 vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
206 break;
207 default:
208 pr_err("%s: regulator already disabled\n", __func__);
209 return -EPERM;
210 }
211 vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
212
213 vprog = (vprog + 1) >> 1;
214 if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
215 vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
216
217
218 bank = PM8058_REGULATOR_BANK_SEL(1);
219 error = regmap_write(regmap, test2_addr, bank);
220 if (error)
221 return error;
222
223 error = regmap_update_bits(regmap, test2_addr,
224 PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
225 | PM8058_SMPS_LEGACY_VLOW_SEL,
226 PM8058_REGULATOR_BANK_WRITE |
227 PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
228 if (error)
229 return error;
230
231
232 bank = PM8058_REGULATOR_BANK_SEL(7);
233 error = regmap_write(regmap, test2_addr, bank);
234 if (error)
235 return error;
236
237 error = regmap_update_bits(regmap, test2_addr,
238 PM8058_REGULATOR_BANK_WRITE |
239 PM8058_REGULATOR_BANK_MASK |
240 PM8058_SMPS_ADVANCED_MODE_MASK,
241 PM8058_REGULATOR_BANK_WRITE |
242 PM8058_REGULATOR_BANK_SEL(7) |
243 PM8058_SMPS_LEGACY_MODE);
244 if (error)
245 return error;
246
247
248 error = regmap_update_bits(regmap, ctrl_addr,
249 PM8058_REGULATOR_ENABLE_MASK |
250 PM8058_REGULATOR_PULL_DOWN_MASK |
251 PM8058_SMPS_LEGACY_VREF_SEL |
252 PM8058_SMPS_LEGACY_VPROG_MASK,
253 PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
254 | vref_sel | vprog);
255 if (error)
256 return error;
257 }
258
259
260 error = regmap_update_bits(regmap, master_enable_addr,
261 master_enable_bit, master_enable_bit);
262 if (error)
263 return error;
264
265
266 return regmap_update_bits(regmap, ctrl_addr,
267 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
268 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
269}
270
271static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
272 u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
273{
274 int error;
275
276
277 error = regmap_update_bits(regmap, master_enable_addr,
278 master_enable_bit, master_enable_bit);
279 if (error)
280 return error;
281
282
283 return regmap_update_bits(regmap, ctrl_addr,
284 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
285 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
286}
287
288static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
289{
290 int error;
291 struct regmap *regmap = pwrkey->regmap;
292 u8 mask, val;
293
294
295 if (!reset) {
296
297 pm8058_disable_smps_locally_set_pull_down(regmap,
298 PM8058_S0_CTRL, PM8058_S0_TEST2,
299 REG_PM8058_VREG_EN_MSM, BIT(7));
300 pm8058_disable_smps_locally_set_pull_down(regmap,
301 PM8058_S1_CTRL, PM8058_S1_TEST2,
302 REG_PM8058_VREG_EN_MSM, BIT(6));
303 pm8058_disable_smps_locally_set_pull_down(regmap,
304 PM8058_S3_CTRL, PM8058_S3_TEST2,
305 REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
306
307 pm8058_disable_ldo_locally_set_pull_down(regmap,
308 PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
309 BIT(1));
310 }
311
312
313
314
315
316 error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
317 if (error)
318 return error;
319
320
321 mask = SLEEP_CTRL_SMPL_EN_RESET;
322 val = 0;
323 if (reset)
324 val = mask;
325 return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
326}
327
328static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
329{
330 struct regmap *regmap = pwrkey->regmap;
331 u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
332 u8 val = 0;
333
334
335 if (reset)
336 val = mask;
337 return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
338}
339
340static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
341{
342 struct input_dev *pwr;
343 int key_release_irq = platform_get_irq(pdev, 0);
344 int key_press_irq = platform_get_irq(pdev, 1);
345 int err;
346 unsigned int delay;
347 unsigned int pon_cntl;
348 struct regmap *regmap;
349 struct pmic8xxx_pwrkey *pwrkey;
350 u32 kpd_delay;
351 bool pull_up;
352
353 if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
354 kpd_delay = 15625;
355
356 if (kpd_delay > 62500 || kpd_delay == 0) {
357 dev_err(&pdev->dev, "invalid power key trigger delay\n");
358 return -EINVAL;
359 }
360
361 pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
362
363 regmap = dev_get_regmap(pdev->dev.parent, NULL);
364 if (!regmap) {
365 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
366 return -ENODEV;
367 }
368
369 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
370 if (!pwrkey)
371 return -ENOMEM;
372
373 pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
374 pwrkey->regmap = regmap;
375 pwrkey->key_press_irq = key_press_irq;
376
377 pwr = devm_input_allocate_device(&pdev->dev);
378 if (!pwr) {
379 dev_dbg(&pdev->dev, "Can't allocate power button\n");
380 return -ENOMEM;
381 }
382
383 input_set_capability(pwr, EV_KEY, KEY_POWER);
384
385 pwr->name = "pmic8xxx_pwrkey";
386 pwr->phys = "pmic8xxx_pwrkey/input0";
387
388 delay = (kpd_delay << 10) / USEC_PER_SEC;
389 delay = 1 + ilog2(delay);
390
391 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
392 if (err < 0) {
393 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
394 return err;
395 }
396
397 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
398 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
399 if (pull_up)
400 pon_cntl |= PON_CNTL_PULL_UP;
401 else
402 pon_cntl &= ~PON_CNTL_PULL_UP;
403
404 err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
405 if (err < 0) {
406 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
407 return err;
408 }
409
410 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
411 IRQF_TRIGGER_RISING,
412 "pmic8xxx_pwrkey_press", pwr);
413 if (err) {
414 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
415 key_press_irq, err);
416 return err;
417 }
418
419 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
420 IRQF_TRIGGER_RISING,
421 "pmic8xxx_pwrkey_release", pwr);
422 if (err) {
423 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
424 key_release_irq, err);
425 return err;
426 }
427
428 err = input_register_device(pwr);
429 if (err) {
430 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
431 return err;
432 }
433
434 platform_set_drvdata(pdev, pwrkey);
435 device_init_wakeup(&pdev->dev, 1);
436
437 return 0;
438}
439
440static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
441{
442 device_init_wakeup(&pdev->dev, 0);
443
444 return 0;
445}
446
447static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
448 { .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
449 { .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
450 { }
451};
452MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
453
454static struct platform_driver pmic8xxx_pwrkey_driver = {
455 .probe = pmic8xxx_pwrkey_probe,
456 .remove = pmic8xxx_pwrkey_remove,
457 .shutdown = pmic8xxx_pwrkey_shutdown,
458 .driver = {
459 .name = "pm8xxx-pwrkey",
460 .pm = &pm8xxx_pwr_key_pm_ops,
461 .of_match_table = pm8xxx_pwr_key_id_table,
462 },
463};
464module_platform_driver(pmic8xxx_pwrkey_driver);
465
466MODULE_ALIAS("platform:pmic8xxx_pwrkey");
467MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
468MODULE_LICENSE("GPL v2");
469MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
470