drivers/input/misc/pmic8xxx-pwrkey.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
   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
  16 #define PON_CNTL_1 0x1C
  17 #define PON_CNTL_PULL_UP BIT(7)
  18 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
  19 #define PON_CNTL_1_PULL_UP_EN                   0xe0
  20 #define PON_CNTL_1_USB_PWR_EN                   0x10
  21 #define PON_CNTL_1_WD_EN_RESET                  0x08
  22
  23 #define PM8058_SLEEP_CTRL                       0x02b
  24 #define PM8921_SLEEP_CTRL                       0x10a
  25
  26 #define SLEEP_CTRL_SMPL_EN_RESET                0x04
  27
  28 /* Regulator master enable addresses */
  29 #define REG_PM8058_VREG_EN_MSM                  0x018
  30 #define REG_PM8058_VREG_EN_GRP_5_4              0x1c8
  31
  32 /* Regulator control registers for shutdown/reset */
  33 #define PM8058_S0_CTRL                          0x004
  34 #define PM8058_S1_CTRL                          0x005
  35 #define PM8058_S3_CTRL                          0x111
  36 #define PM8058_L21_CTRL                         0x120
  37 #define PM8058_L22_CTRL                         0x121
  38
  39 #define PM8058_REGULATOR_ENABLE_MASK            0x80
  40 #define PM8058_REGULATOR_ENABLE                 0x80
  41 #define PM8058_REGULATOR_DISABLE                0x00
  42 #define PM8058_REGULATOR_PULL_DOWN_MASK         0x40
  43 #define PM8058_REGULATOR_PULL_DOWN_EN           0x40
  44
  45 /* Buck CTRL register */
  46 #define PM8058_SMPS_LEGACY_VREF_SEL             0x20
  47 #define PM8058_SMPS_LEGACY_VPROG_MASK           0x1f
  48 #define PM8058_SMPS_ADVANCED_BAND_MASK          0xC0
  49 #define PM8058_SMPS_ADVANCED_BAND_SHIFT         6
  50 #define PM8058_SMPS_ADVANCED_VPROG_MASK         0x3f
  51
  52 /* Buck TEST2 registers for shutdown/reset */
  53 #define PM8058_S0_TEST2                         0x084
  54 #define PM8058_S1_TEST2                         0x085
  55 #define PM8058_S3_TEST2                         0x11a
  56
  57 #define PM8058_REGULATOR_BANK_WRITE             0x80
  58 #define PM8058_REGULATOR_BANK_MASK              0x70
  59 #define PM8058_REGULATOR_BANK_SHIFT             4
  60 #define PM8058_REGULATOR_BANK_SEL(n)    ((n) << PM8058_REGULATOR_BANK_SHIFT)
  61
  62 /* Buck TEST2 register bank 1 */
  63 #define PM8058_SMPS_LEGACY_VLOW_SEL             0x01
  64
  65 /* Buck TEST2 register bank 7 */
  66 #define PM8058_SMPS_ADVANCED_MODE_MASK          0x02
  67 #define PM8058_SMPS_ADVANCED_MODE               0x02
  68 #define PM8058_SMPS_LEGACY_MODE                 0x00
  69
  70 /**
  71  * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
  72  * @key_press_irq: key press irq number
  73  * @regmap: device regmap
  74  * @shutdown_fn: shutdown configuration function
  75  */
  76 struct pmic8xxx_pwrkey {
  77         int key_press_irq;
  78         struct regmap *regmap;
  79         int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
  80 };
  81
  82 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
  83 {
  84         struct input_dev *pwr = _pwr;
  85
  86         input_report_key(pwr, KEY_POWER, 1);
  87         input_sync(pwr);
  88
  89         return IRQ_HANDLED;
  90 }
  91
  92 static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
  93 {
  94         struct input_dev *pwr = _pwr;
  95
  96         input_report_key(pwr, KEY_POWER, 0);
  97         input_sync(pwr);
  98
  99         return IRQ_HANDLED;
 100 }
 101
 102 static int pmic8xxx_pwrkey_suspend(struct device *dev)
 103 {
 104         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 105
 106         if (device_may_wakeup(dev))
 107                 enable_irq_wake(pwrkey->key_press_irq);
 108
 109         return 0;
 110 }
 111
 112 static int pmic8xxx_pwrkey_resume(struct device *dev)
 113 {
 114         struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
 115
 116         if (device_may_wakeup(dev))
 117                 disable_irq_wake(pwrkey->key_press_irq);
 118
 119         return 0;
 120 }
 121
 122 static DEFINE_SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
 123                 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
 124
 125 static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
 126 {
 127         struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
 128         int error;
 129         u8 mask, val;
 130         bool reset = system_state == SYSTEM_RESTART;
 131
 132         if (pwrkey->shutdown_fn) {
 133                 error = pwrkey->shutdown_fn(pwrkey, reset);
 134                 if (error)
 135                         return;
 136         }
 137
 138         /*
 139          * Select action to perform (reset or shutdown) when PS_HOLD goes low.
 140          * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
 141          * USB charging is enabled.
 142          */
 143         mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
 144         mask |= PON_CNTL_1_WD_EN_RESET;
 145         val = mask;
 146         if (!reset)
 147                 val &= ~PON_CNTL_1_WD_EN_RESET;
 148
 149         regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
 150 }
 151
 152 /*
 153  * Set an SMPS regulator to be disabled in its CTRL register, but enabled
 154  * in the master enable register.  Also set it's pull down enable bit.
 155  * Take care to make sure that the output voltage doesn't change if switching
 156  * from advanced mode to legacy mode.
 157  */
 158 static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
 159         u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
 160         u8 master_enable_bit)
 161 {
 162         int error;
 163         u8 vref_sel, vlow_sel, band, vprog, bank;
 164         unsigned int reg;
 165
 166         bank = PM8058_REGULATOR_BANK_SEL(7);
 167         error = regmap_write(regmap, test2_addr, bank);
 168         if (error)
 169                 return error;
 170
 171         error = regmap_read(regmap, test2_addr, &reg);
 172         if (error)
 173                 return error;
 174
 175         reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
 176         /* Check if in advanced mode. */
 177         if (reg == PM8058_SMPS_ADVANCED_MODE) {
 178                 /* Determine current output voltage. */
 179                 error = regmap_read(regmap, ctrl_addr, &reg);
 180                 if (error)
 181                         return error;
 182
 183                 band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
 184                 band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
 185                 switch (band) {
 186                 case 3:
 187                         vref_sel = 0;
 188                         vlow_sel = 0;
 189                         break;
 190                 case 2:
 191                         vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
 192                         vlow_sel = 0;
 193                         break;
 194                 case 1:
 195                         vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
 196                         vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
 197                         break;
 198                 default:
 199                         pr_err("%s: regulator already disabled\n", __func__);
 200                         return -EPERM;
 201                 }
 202                 vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
 203                 /* Round up if fine step is in use. */
 204                 vprog = (vprog + 1) >> 1;
 205                 if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
 206                         vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
 207
 208                 /* Set VLOW_SEL bit. */
 209                 bank = PM8058_REGULATOR_BANK_SEL(1);
 210                 error = regmap_write(regmap, test2_addr, bank);
 211                 if (error)
 212                         return error;
 213
 214                 error = regmap_update_bits(regmap, test2_addr,
 215                         PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
 216                                 | PM8058_SMPS_LEGACY_VLOW_SEL,
 217                         PM8058_REGULATOR_BANK_WRITE |
 218                         PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
 219                 if (error)
 220                         return error;
 221
 222                 /* Switch to legacy mode */
 223                 bank = PM8058_REGULATOR_BANK_SEL(7);
 224                 error = regmap_write(regmap, test2_addr, bank);
 225                 if (error)
 226                         return error;
 227
 228                 error = regmap_update_bits(regmap, test2_addr,
 229                                 PM8058_REGULATOR_BANK_WRITE |
 230                                 PM8058_REGULATOR_BANK_MASK |
 231                                 PM8058_SMPS_ADVANCED_MODE_MASK,
 232                                 PM8058_REGULATOR_BANK_WRITE |
 233                                 PM8058_REGULATOR_BANK_SEL(7) |
 234                                 PM8058_SMPS_LEGACY_MODE);
 235                 if (error)
 236                         return error;
 237
 238                 /* Enable locally, enable pull down, keep voltage the same. */
 239                 error = regmap_update_bits(regmap, ctrl_addr,
 240                         PM8058_REGULATOR_ENABLE_MASK |
 241                         PM8058_REGULATOR_PULL_DOWN_MASK |
 242                         PM8058_SMPS_LEGACY_VREF_SEL |
 243                         PM8058_SMPS_LEGACY_VPROG_MASK,
 244                         PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
 245                                 | vref_sel | vprog);
 246                 if (error)
 247                         return error;
 248         }
 249
 250         /* Enable in master control register. */
 251         error = regmap_update_bits(regmap, master_enable_addr,
 252                         master_enable_bit, master_enable_bit);
 253         if (error)
 254                 return error;
 255
 256         /* Disable locally and enable pull down. */
 257         return regmap_update_bits(regmap, ctrl_addr,
 258                 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
 259                 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
 260 }
 261
 262 static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
 263                 u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
 264 {
 265         int error;
 266
 267         /* Enable LDO in master control register. */
 268         error = regmap_update_bits(regmap, master_enable_addr,
 269                         master_enable_bit, master_enable_bit);
 270         if (error)
 271                 return error;
 272
 273         /* Disable LDO in CTRL register and set pull down */
 274         return regmap_update_bits(regmap, ctrl_addr,
 275                 PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
 276                 PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
 277 }
 278
 279 static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
 280 {
 281         int error;
 282         struct regmap *regmap = pwrkey->regmap;
 283         u8 mask, val;
 284
 285         /* When shutting down, enable active pulldowns on important rails. */
 286         if (!reset) {
 287                 /* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
 288                 pm8058_disable_smps_locally_set_pull_down(regmap,
 289                         PM8058_S0_CTRL, PM8058_S0_TEST2,
 290                         REG_PM8058_VREG_EN_MSM, BIT(7));
 291                 pm8058_disable_smps_locally_set_pull_down(regmap,
 292                         PM8058_S1_CTRL, PM8058_S1_TEST2,
 293                         REG_PM8058_VREG_EN_MSM, BIT(6));
 294                 pm8058_disable_smps_locally_set_pull_down(regmap,
 295                         PM8058_S3_CTRL, PM8058_S3_TEST2,
 296                         REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
 297                 /* Disable LDO 21 locally and set pulldown enable bit. */
 298                 pm8058_disable_ldo_locally_set_pull_down(regmap,
 299                         PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
 300                         BIT(1));
 301         }
 302
 303         /*
 304          * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
 305          * pull-down state intact. This ensures a safe shutdown.
 306          */
 307         error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
 308         if (error)
 309                 return error;
 310
 311         /* Enable SMPL if resetting is desired */
 312         mask = SLEEP_CTRL_SMPL_EN_RESET;
 313         val = 0;
 314         if (reset)
 315                 val = mask;
 316         return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
 317 }
 318
 319 static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
 320 {
 321         struct regmap *regmap = pwrkey->regmap;
 322         u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
 323         u8 val = 0;
 324
 325         /* Enable SMPL if resetting is desired */
 326         if (reset)
 327                 val = mask;
 328         return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
 329 }
 330
 331 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
 332 {
 333         struct input_dev *pwr;
 334         int key_release_irq = platform_get_irq(pdev, 0);
 335         int key_press_irq = platform_get_irq(pdev, 1);
 336         int err;
 337         unsigned int delay;
 338         unsigned int pon_cntl;
 339         struct regmap *regmap;
 340         struct pmic8xxx_pwrkey *pwrkey;
 341         u32 kpd_delay;
 342         bool pull_up;
 343
 344         if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
 345                 kpd_delay = 15625;
 346
 347         /* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
 348         if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
 349                 dev_err(&pdev->dev, "invalid power key trigger delay\n");
 350                 return -EINVAL;
 351         }
 352
 353         pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
 354
 355         regmap = dev_get_regmap(pdev->dev.parent, NULL);
 356         if (!regmap) {
 357                 dev_err(&pdev->dev, "failed to locate regmap for the device\n");
 358                 return -ENODEV;
 359         }
 360
 361         pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
 362         if (!pwrkey)
 363                 return -ENOMEM;
 364
 365         pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
 366         pwrkey->regmap = regmap;
 367         pwrkey->key_press_irq = key_press_irq;
 368
 369         pwr = devm_input_allocate_device(&pdev->dev);
 370         if (!pwr) {
 371                 dev_dbg(&pdev->dev, "Can't allocate power button\n");
 372                 return -ENOMEM;
 373         }
 374
 375         input_set_capability(pwr, EV_KEY, KEY_POWER);
 376
 377         pwr->name = "pmic8xxx_pwrkey";
 378         pwr->phys = "pmic8xxx_pwrkey/input0";
 379
 380         delay = (kpd_delay << 6) / USEC_PER_SEC;
 381         delay = ilog2(delay);
 382
 383         err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
 384         if (err < 0) {
 385                 dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
 386                 return err;
 387         }
 388
 389         pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
 390         pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
 391         if (pull_up)
 392                 pon_cntl |= PON_CNTL_PULL_UP;
 393         else
 394                 pon_cntl &= ~PON_CNTL_PULL_UP;
 395
 396         err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
 397         if (err < 0) {
 398                 dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
 399                 return err;
 400         }
 401
 402         err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
 403                                IRQF_TRIGGER_RISING,
 404                                "pmic8xxx_pwrkey_press", pwr);
 405         if (err) {
 406                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 407                         key_press_irq, err);
 408                 return err;
 409         }
 410
 411         err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
 412                                IRQF_TRIGGER_RISING,
 413                                "pmic8xxx_pwrkey_release", pwr);
 414         if (err) {
 415                 dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
 416                         key_release_irq, err);
 417                 return err;
 418         }
 419
 420         err = input_register_device(pwr);
 421         if (err) {
 422                 dev_err(&pdev->dev, "Can't register power key: %d\n", err);
 423                 return err;
 424         }
 425
 426         platform_set_drvdata(pdev, pwrkey);
 427         device_init_wakeup(&pdev->dev, 1);
 428
 429         return 0;
 430 }
 431
 432 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
 433         { .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
 434         { .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
 435         { }
 436 };
 437 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
 438
 439 static struct platform_driver pmic8xxx_pwrkey_driver = {
 440         .probe          = pmic8xxx_pwrkey_probe,
 441         .shutdown       = pmic8xxx_pwrkey_shutdown,
 442         .driver         = {
 443                 .name   = "pm8xxx-pwrkey",
 444                 .pm     = pm_sleep_ptr(&pm8xxx_pwr_key_pm_ops),
 445                 .of_match_table = pm8xxx_pwr_key_id_table,
 446         },
 447 };
 448 module_platform_driver(pmic8xxx_pwrkey_driver);
 449
 450 MODULE_ALIAS("platform:pmic8xxx_pwrkey");
 451 MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
 452 MODULE_LICENSE("GPL v2");
 453 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");