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 #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 /* Regulator master enable addresses */ 30 #define REG_PM8058_VREG_EN_MSM 0x018 31 #define REG_PM8058_VREG_EN_GRP_5_4 0x1c8 32 33 /* Regulator control registers for shutdown/reset */ 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 /* Buck CTRL register */ 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 /* Buck TEST2 registers for shutdown/reset */ 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 /* Buck TEST2 register bank 1 */ 64 #define PM8058_SMPS_LEGACY_VLOW_SEL 0x01 65 66 /* Buck TEST2 register bank 7 */ 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 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information 73 * @key_press_irq: key press irq number 74 * @regmap: device regmap 75 * @shutdown_fn: shutdown configuration function 76 */ 77 struct pmic8xxx_pwrkey { 78 int key_press_irq; 79 struct regmap *regmap; 80 int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool); 81 }; 82 83 static 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 93 static 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 } 102 103 static int 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 } 112 113 static int 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 } 122 123 static DEFINE_SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops, 124 pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume); 125 126 static 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 * Select action to perform (reset or shutdown) when PS_HOLD goes low. 141 * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that 142 * USB charging is enabled. 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 * Set an SMPS regulator to be disabled in its CTRL register, but enabled 155 * in the master enable register. Also set it's pull down enable bit. 156 * Take care to make sure that the output voltage doesn't change if switching 157 * from advanced mode to legacy mode. 158 */ 159 static 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 /* Check if in advanced mode. */ 178 if (reg == PM8058_SMPS_ADVANCED_MODE) { 179 /* Determine current output voltage. */ 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 /* Round up if fine step is in use. */ 205 vprog = (vprog + 1) >> 1; 206 if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK) 207 vprog = PM8058_SMPS_LEGACY_VPROG_MASK; 208 209 /* Set VLOW_SEL bit. */ 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 /* Switch to legacy mode */ 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 /* Enable locally, enable pull down, keep voltage the same. */ 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 /* Enable in master control register. */ 252 error = regmap_update_bits(regmap, master_enable_addr, 253 master_enable_bit, master_enable_bit); 254 if (error) 255 return error; 256 257 /* Disable locally and enable pull down. */ 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 } 262 263 static 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 /* Enable LDO in master control register. */ 269 error = regmap_update_bits(regmap, master_enable_addr, 270 master_enable_bit, master_enable_bit); 271 if (error) 272 return error; 273 274 /* Disable LDO in CTRL register and set pull down */ 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 } 279 280 static 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 /* When shutting down, enable active pulldowns on important rails. */ 287 if (!reset) { 288 /* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */ 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 /* Disable LDO 21 locally and set pulldown enable bit. */ 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 * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its 306 * pull-down state intact. This ensures a safe shutdown. 307 */ 308 error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93); 309 if (error) 310 return error; 311 312 /* Enable SMPL if resetting is desired */ 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 } 319 320 static 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 /* Enable SMPL if resetting is desired */ 327 if (reset) 328 val = mask; 329 return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val); 330 } 331 332 static 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 /* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */ 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 } 432 433 static 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 }; 438 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table); 439 440 static struct platform_driver pmic8xxx_pwrkey_driver = { 441 .probe = pmic8xxx_pwrkey_probe, 442 .shutdown = pmic8xxx_pwrkey_shutdown, 443 .driver = { 444 .name = "pm8xxx-pwrkey", 445 .pm = pm_sleep_ptr(&pm8xxx_pwr_key_pm_ops), 446 .of_match_table = pm8xxx_pwr_key_id_table, 447 }, 448 }; 449 module_platform_driver(pmic8xxx_pwrkey_driver); 450 451 MODULE_ALIAS("platform:pmic8xxx_pwrkey"); 452 MODULE_DESCRIPTION("PMIC8XXX Power Key driver"); 453 MODULE_LICENSE("GPL v2"); 454 MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>"); 455