1
2
3
4
5#include <linux/module.h>
6#include <linux/kernel.h>
7#include <linux/errno.h>
8#include <linux/slab.h>
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13#include <linux/log2.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16
17#define PON_CNTL_1 0x1C
18#define PON_CNTL_PULL_UP BIT(7)
19#define PON_CNTL_TRIG_DELAY_MASK (0x7)
20#define PON_CNTL_1_PULL_UP_EN 0xe0
21#define PON_CNTL_1_USB_PWR_EN 0x10
22#define PON_CNTL_1_WD_EN_RESET 0x08
23
24#define PM8058_SLEEP_CTRL 0x02b
25#define PM8921_SLEEP_CTRL 0x10a
26
27#define SLEEP_CTRL_SMPL_EN_RESET 0x04
28
29
30#define REG_PM8058_VREG_EN_MSM 0x018
31#define REG_PM8058_VREG_EN_GRP_5_4 0x1c8
32
33
34#define PM8058_S0_CTRL 0x004
35#define PM8058_S1_CTRL 0x005
36#define PM8058_S3_CTRL 0x111
37#define PM8058_L21_CTRL 0x120
38#define PM8058_L22_CTRL 0x121
39
40#define PM8058_REGULATOR_ENABLE_MASK 0x80
41#define PM8058_REGULATOR_ENABLE 0x80
42#define PM8058_REGULATOR_DISABLE 0x00
43#define PM8058_REGULATOR_PULL_DOWN_MASK 0x40
44#define PM8058_REGULATOR_PULL_DOWN_EN 0x40
45
46
47#define PM8058_SMPS_LEGACY_VREF_SEL 0x20
48#define PM8058_SMPS_LEGACY_VPROG_MASK 0x1f
49#define PM8058_SMPS_ADVANCED_BAND_MASK 0xC0
50#define PM8058_SMPS_ADVANCED_BAND_SHIFT 6
51#define PM8058_SMPS_ADVANCED_VPROG_MASK 0x3f
52
53
54#define PM8058_S0_TEST2 0x084
55#define PM8058_S1_TEST2 0x085
56#define PM8058_S3_TEST2 0x11a
57
58#define PM8058_REGULATOR_BANK_WRITE 0x80
59#define PM8058_REGULATOR_BANK_MASK 0x70
60#define PM8058_REGULATOR_BANK_SHIFT 4
61#define PM8058_REGULATOR_BANK_SEL(n) ((n) << PM8058_REGULATOR_BANK_SHIFT)
62
63
64#define PM8058_SMPS_LEGACY_VLOW_SEL 0x01
65
66
67#define PM8058_SMPS_ADVANCED_MODE_MASK 0x02
68#define PM8058_SMPS_ADVANCED_MODE 0x02
69#define PM8058_SMPS_LEGACY_MODE 0x00
70
71
72
73
74
75
76
77struct pmic8xxx_pwrkey {
78 int key_press_irq;
79 struct regmap *regmap;
80 int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
81};
82
83static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
84{
85 struct input_dev *pwr = _pwr;
86
87 input_report_key(pwr, KEY_POWER, 1);
88 input_sync(pwr);
89
90 return IRQ_HANDLED;
91}
92
93static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
94{
95 struct input_dev *pwr = _pwr;
96
97 input_report_key(pwr, KEY_POWER, 0);
98 input_sync(pwr);
99
100 return IRQ_HANDLED;
101}
102
103static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
104{
105 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
106
107 if (device_may_wakeup(dev))
108 enable_irq_wake(pwrkey->key_press_irq);
109
110 return 0;
111}
112
113static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
114{
115 struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
116
117 if (device_may_wakeup(dev))
118 disable_irq_wake(pwrkey->key_press_irq);
119
120 return 0;
121}
122
123static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
124 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
125
126static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
127{
128 struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
129 int error;
130 u8 mask, val;
131 bool reset = system_state == SYSTEM_RESTART;
132
133 if (pwrkey->shutdown_fn) {
134 error = pwrkey->shutdown_fn(pwrkey, reset);
135 if (error)
136 return;
137 }
138
139
140
141
142
143
144 mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
145 mask |= PON_CNTL_1_WD_EN_RESET;
146 val = mask;
147 if (!reset)
148 val &= ~PON_CNTL_1_WD_EN_RESET;
149
150 regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
151}
152
153
154
155
156
157
158
159static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
160 u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
161 u8 master_enable_bit)
162{
163 int error;
164 u8 vref_sel, vlow_sel, band, vprog, bank;
165 unsigned int reg;
166
167 bank = PM8058_REGULATOR_BANK_SEL(7);
168 error = regmap_write(regmap, test2_addr, bank);
169 if (error)
170 return error;
171
172 error = regmap_read(regmap, test2_addr, ®);
173 if (error)
174 return error;
175
176 reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
177
178 if (reg == PM8058_SMPS_ADVANCED_MODE) {
179
180 error = regmap_read(regmap, ctrl_addr, ®);
181 if (error)
182 return error;
183
184 band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
185 band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
186 switch (band) {
187 case 3:
188 vref_sel = 0;
189 vlow_sel = 0;
190 break;
191 case 2:
192 vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
193 vlow_sel = 0;
194 break;
195 case 1:
196 vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
197 vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
198 break;
199 default:
200 pr_err("%s: regulator already disabled\n", __func__);
201 return -EPERM;
202 }
203 vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
204
205 vprog = (vprog + 1) >> 1;
206 if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
207 vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
208
209
210 bank = PM8058_REGULATOR_BANK_SEL(1);
211 error = regmap_write(regmap, test2_addr, bank);
212 if (error)
213 return error;
214
215 error = regmap_update_bits(regmap, test2_addr,
216 PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
217 | PM8058_SMPS_LEGACY_VLOW_SEL,
218 PM8058_REGULATOR_BANK_WRITE |
219 PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
220 if (error)
221 return error;
222
223
224 bank = PM8058_REGULATOR_BANK_SEL(7);
225 error = regmap_write(regmap, test2_addr, bank);
226 if (error)
227 return error;
228
229 error = regmap_update_bits(regmap, test2_addr,
230 PM8058_REGULATOR_BANK_WRITE |
231 PM8058_REGULATOR_BANK_MASK |
232 PM8058_SMPS_ADVANCED_MODE_MASK,
233 PM8058_REGULATOR_BANK_WRITE |
234 PM8058_REGULATOR_BANK_SEL(7) |
235 PM8058_SMPS_LEGACY_MODE);
236 if (error)
237 return error;
238
239
240 error = regmap_update_bits(regmap, ctrl_addr,
241 PM8058_REGULATOR_ENABLE_MASK |
242 PM8058_REGULATOR_PULL_DOWN_MASK |
243 PM8058_SMPS_LEGACY_VREF_SEL |
244 PM8058_SMPS_LEGACY_VPROG_MASK,
245 PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
246 | vref_sel | vprog);
247 if (error)
248 return error;
249 }
250
251
252 error = regmap_update_bits(regmap, master_enable_addr,
253 master_enable_bit, master_enable_bit);
254 if (error)
255 return error;
256
257
258 return regmap_update_bits(regmap, ctrl_addr,
259 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
260 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
261}
262
263static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
264 u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
265{
266 int error;
267
268
269 error = regmap_update_bits(regmap, master_enable_addr,
270 master_enable_bit, master_enable_bit);
271 if (error)
272 return error;
273
274
275 return regmap_update_bits(regmap, ctrl_addr,
276 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
277 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
278}
279
280static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
281{
282 int error;
283 struct regmap *regmap = pwrkey->regmap;
284 u8 mask, val;
285
286
287 if (!reset) {
288
289 pm8058_disable_smps_locally_set_pull_down(regmap,
290 PM8058_S0_CTRL, PM8058_S0_TEST2,
291 REG_PM8058_VREG_EN_MSM, BIT(7));
292 pm8058_disable_smps_locally_set_pull_down(regmap,
293 PM8058_S1_CTRL, PM8058_S1_TEST2,
294 REG_PM8058_VREG_EN_MSM, BIT(6));
295 pm8058_disable_smps_locally_set_pull_down(regmap,
296 PM8058_S3_CTRL, PM8058_S3_TEST2,
297 REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
298
299 pm8058_disable_ldo_locally_set_pull_down(regmap,
300 PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
301 BIT(1));
302 }
303
304
305
306
307
308 error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
309 if (error)
310 return error;
311
312
313 mask = SLEEP_CTRL_SMPL_EN_RESET;
314 val = 0;
315 if (reset)
316 val = mask;
317 return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
318}
319
320static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
321{
322 struct regmap *regmap = pwrkey->regmap;
323 u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
324 u8 val = 0;
325
326
327 if (reset)
328 val = mask;
329 return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
330}
331
332static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
333{
334 struct input_dev *pwr;
335 int key_release_irq = platform_get_irq(pdev, 0);
336 int key_press_irq = platform_get_irq(pdev, 1);
337 int err;
338 unsigned int delay;
339 unsigned int pon_cntl;
340 struct regmap *regmap;
341 struct pmic8xxx_pwrkey *pwrkey;
342 u32 kpd_delay;
343 bool pull_up;
344
345 if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
346 kpd_delay = 15625;
347
348
349 if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
350 dev_err(&pdev->dev, "invalid power key trigger delay\n");
351 return -EINVAL;
352 }
353
354 pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
355
356 regmap = dev_get_regmap(pdev->dev.parent, NULL);
357 if (!regmap) {
358 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
359 return -ENODEV;
360 }
361
362 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
363 if (!pwrkey)
364 return -ENOMEM;
365
366 pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
367 pwrkey->regmap = regmap;
368 pwrkey->key_press_irq = key_press_irq;
369
370 pwr = devm_input_allocate_device(&pdev->dev);
371 if (!pwr) {
372 dev_dbg(&pdev->dev, "Can't allocate power button\n");
373 return -ENOMEM;
374 }
375
376 input_set_capability(pwr, EV_KEY, KEY_POWER);
377
378 pwr->name = "pmic8xxx_pwrkey";
379 pwr->phys = "pmic8xxx_pwrkey/input0";
380
381 delay = (kpd_delay << 6) / USEC_PER_SEC;
382 delay = ilog2(delay);
383
384 err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
385 if (err < 0) {
386 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
387 return err;
388 }
389
390 pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
391 pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
392 if (pull_up)
393 pon_cntl |= PON_CNTL_PULL_UP;
394 else
395 pon_cntl &= ~PON_CNTL_PULL_UP;
396
397 err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
398 if (err < 0) {
399 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
400 return err;
401 }
402
403 err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
404 IRQF_TRIGGER_RISING,
405 "pmic8xxx_pwrkey_press", pwr);
406 if (err) {
407 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
408 key_press_irq, err);
409 return err;
410 }
411
412 err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
413 IRQF_TRIGGER_RISING,
414 "pmic8xxx_pwrkey_release", pwr);
415 if (err) {
416 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
417 key_release_irq, err);
418 return err;
419 }
420
421 err = input_register_device(pwr);
422 if (err) {
423 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
424 return err;
425 }
426
427 platform_set_drvdata(pdev, pwrkey);
428 device_init_wakeup(&pdev->dev, 1);
429
430 return 0;
431}
432
433static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
434 { .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
435 { .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
436 { }
437};
438MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
439
440static struct platform_driver pmic8xxx_pwrkey_driver = {
441 .probe = pmic8xxx_pwrkey_probe,
442 .shutdown = pmic8xxx_pwrkey_shutdown,
443 .driver = {
444 .name = "pm8xxx-pwrkey",
445 .pm = &pm8xxx_pwr_key_pm_ops,
446 .of_match_table = pm8xxx_pwr_key_id_table,
447 },
448};
449module_platform_driver(pmic8xxx_pwrkey_driver);
450
451MODULE_ALIAS("platform:pmic8xxx_pwrkey");
452MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
453MODULE_LICENSE("GPL v2");
454MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
455
