kernel/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>");