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Linux/drivers/input/misc/pmic8xxx-pwrkey.c

  1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  2  *
  3  * This program is free software; you can redistribute it and/or modify
  4  * it under the terms of the GNU General Public License version 2 and
  5  * only version 2 as published by the Free Software Foundation.
  6  *
  7  * This program is distributed in the hope that it will be useful,
  8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10  * GNU General Public License for more details.
 11  */
 12 
 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 /* Regulator master enable addresses */
 38 #define REG_PM8058_VREG_EN_MSM                  0x018
 39 #define REG_PM8058_VREG_EN_GRP_5_4              0x1c8
 40 
 41 /* Regulator control registers for shutdown/reset */
 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 /* Buck CTRL register */
 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 /* Buck TEST2 registers for shutdown/reset */
 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 /* Buck TEST2 register bank 1 */
 72 #define PM8058_SMPS_LEGACY_VLOW_SEL             0x01
 73 
 74 /* Buck TEST2 register bank 7 */
 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  * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
 81  * @key_press_irq: key press irq number
 82  * @regmap: device regmap
 83  * @shutdown_fn: shutdown configuration function
 84  */
 85 struct pmic8xxx_pwrkey {
 86         int key_press_irq;
 87         struct regmap *regmap;
 88         int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
 89 };
 90 
 91 static 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 
101 static 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 
111 static 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 
121 static 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 
131 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
132                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
133 
134 static 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          * Select action to perform (reset or shutdown) when PS_HOLD goes low.
149          * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
150          * USB charging is enabled.
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  * Set an SMPS regulator to be disabled in its CTRL register, but enabled
163  * in the master enable register.  Also set it's pull down enable bit.
164  * Take care to make sure that the output voltage doesn't change if switching
165  * from advanced mode to legacy mode.
166  */
167 static 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, &reg);
181         if (error)
182                 return error;
183 
184         reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
185         /* Check if in advanced mode. */
186         if (reg == PM8058_SMPS_ADVANCED_MODE) {
187                 /* Determine current output voltage. */
188                 error = regmap_read(regmap, ctrl_addr, &reg);
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                 /* Round up if fine step is in use. */
213                 vprog = (vprog + 1) >> 1;
214                 if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
215                         vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
216 
217                 /* Set VLOW_SEL bit. */
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                 /* Switch to legacy mode */
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                 /* Enable locally, enable pull down, keep voltage the same. */
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         /* Enable in master control register. */
260         error = regmap_update_bits(regmap, master_enable_addr,
261                         master_enable_bit, master_enable_bit);
262         if (error)
263                 return error;
264 
265         /* Disable locally and enable pull down. */
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 
271 static 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         /* Enable LDO in master control register. */
277         error = regmap_update_bits(regmap, master_enable_addr,
278                         master_enable_bit, master_enable_bit);
279         if (error)
280                 return error;
281 
282         /* Disable LDO in CTRL register and set pull down */
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 
288 static 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         /* When shutting down, enable active pulldowns on important rails. */
295         if (!reset) {
296                 /* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
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                 /* Disable LDO 21 locally and set pulldown enable bit. */
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          * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
314          * pull-down state intact. This ensures a safe shutdown.
315          */
316         error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
317         if (error)
318                 return error;
319 
320         /* Enable SMPL if resetting is desired */
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 
328 static 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         /* Enable SMPL if resetting is desired */
335         if (reset)
336                 val = mask;
337         return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
338 }
339 
340 static 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 
440 static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
441 {
442         device_init_wakeup(&pdev->dev, 0);
443 
444         return 0;
445 }
446 
447 static 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 };
452 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
453 
454 static 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 };
464 module_platform_driver(pmic8xxx_pwrkey_driver);
465 
466 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
467 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
468 MODULE_LICENSE("GPL v2");
469 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
470 

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