drivers/mfd/rk808.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MFD core driver for Rockchip RK808/RK818
   4  *
   5  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   6  *
   7  * Author: Chris Zhong <zyw@rock-chips.com>
   8  * Author: Zhang Qing <zhangqing@rock-chips.com>
   9  *
  10  * Copyright (C) 2016 PHYTEC Messtechnik GmbH
  11  *
  12  * Author: Wadim Egorov <w.egorov@phytec.de>
  13  */
  14
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/mfd/rk808.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/module.h>
  20 #include <linux/of_device.h>
  21 #include <linux/regmap.h>
  22 #include <linux/syscore_ops.h>
  23
  24 struct rk808_reg_data {
  25         int addr;
  26         int mask;
  27         int value;
  28 };
  29
  30 static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
  31 {
  32         /*
  33          * Notes:
  34          * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
  35          *   we don't use that feature.  It's better to cache.
  36          * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
  37          *   bits are cleared in case when we shutoff anyway, but better safe.
  38          */
  39
  40         switch (reg) {
  41         case RK808_SECONDS_REG ... RK808_WEEKS_REG:
  42         case RK808_RTC_STATUS_REG:
  43         case RK808_VB_MON_REG:
  44         case RK808_THERMAL_REG:
  45         case RK808_DCDC_UV_STS_REG:
  46         case RK808_LDO_UV_STS_REG:
  47         case RK808_DCDC_PG_REG:
  48         case RK808_LDO_PG_REG:
  49         case RK808_DEVCTRL_REG:
  50         case RK808_INT_STS_REG1:
  51         case RK808_INT_STS_REG2:
  52                 return true;
  53         }
  54
  55         return false;
  56 }
  57
  58 static bool rk817_is_volatile_reg(struct device *dev, unsigned int reg)
  59 {
  60         /*
  61          * Notes:
  62          * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
  63          *   we don't use that feature.  It's better to cache.
  64          */
  65
  66         switch (reg) {
  67         case RK817_SECONDS_REG ... RK817_WEEKS_REG:
  68         case RK817_RTC_STATUS_REG:
  69         case RK817_INT_STS_REG0:
  70         case RK817_INT_STS_REG1:
  71         case RK817_INT_STS_REG2:
  72         case RK817_SYS_STS:
  73                 return true;
  74         }
  75
  76         return true;
  77 }
  78
  79 static const struct regmap_config rk818_regmap_config = {
  80         .reg_bits = 8,
  81         .val_bits = 8,
  82         .max_register = RK818_USB_CTRL_REG,
  83         .cache_type = REGCACHE_RBTREE,
  84         .volatile_reg = rk808_is_volatile_reg,
  85 };
  86
  87 static const struct regmap_config rk805_regmap_config = {
  88         .reg_bits = 8,
  89         .val_bits = 8,
  90         .max_register = RK805_OFF_SOURCE_REG,
  91         .cache_type = REGCACHE_RBTREE,
  92         .volatile_reg = rk808_is_volatile_reg,
  93 };
  94
  95 static const struct regmap_config rk808_regmap_config = {
  96         .reg_bits = 8,
  97         .val_bits = 8,
  98         .max_register = RK808_IO_POL_REG,
  99         .cache_type = REGCACHE_RBTREE,
 100         .volatile_reg = rk808_is_volatile_reg,
 101 };
 102
 103 static const struct regmap_config rk817_regmap_config = {
 104         .reg_bits = 8,
 105         .val_bits = 8,
 106         .max_register = RK817_GPIO_INT_CFG,
 107         .cache_type = REGCACHE_NONE,
 108         .volatile_reg = rk817_is_volatile_reg,
 109 };
 110
 111 static struct resource rtc_resources[] = {
 112         {
 113                 .start  = RK808_IRQ_RTC_ALARM,
 114                 .end    = RK808_IRQ_RTC_ALARM,
 115                 .flags  = IORESOURCE_IRQ,
 116         }
 117 };
 118
 119 static struct resource rk817_rtc_resources[] = {
 120         DEFINE_RES_IRQ(RK817_IRQ_RTC_ALARM),
 121 };
 122
 123 static struct resource rk805_key_resources[] = {
 124         DEFINE_RES_IRQ(RK805_IRQ_PWRON_RISE),
 125         DEFINE_RES_IRQ(RK805_IRQ_PWRON_FALL),
 126 };
 127
 128 static struct resource rk817_pwrkey_resources[] = {
 129         DEFINE_RES_IRQ(RK817_IRQ_PWRON_RISE),
 130         DEFINE_RES_IRQ(RK817_IRQ_PWRON_FALL),
 131 };
 132
 133 static const struct mfd_cell rk805s[] = {
 134         { .name = "rk808-clkout", },
 135         { .name = "rk808-regulator", },
 136         { .name = "rk805-pinctrl", },
 137         {
 138                 .name = "rk808-rtc",
 139                 .num_resources = ARRAY_SIZE(rtc_resources),
 140                 .resources = &rtc_resources[0],
 141         },
 142         {       .name = "rk805-pwrkey",
 143                 .num_resources = ARRAY_SIZE(rk805_key_resources),
 144                 .resources = &rk805_key_resources[0],
 145         },
 146 };
 147
 148 static const struct mfd_cell rk808s[] = {
 149         { .name = "rk808-clkout", },
 150         { .name = "rk808-regulator", },
 151         {
 152                 .name = "rk808-rtc",
 153                 .num_resources = ARRAY_SIZE(rtc_resources),
 154                 .resources = rtc_resources,
 155         },
 156 };
 157
 158 static const struct mfd_cell rk817s[] = {
 159         { .name = "rk808-clkout",},
 160         { .name = "rk808-regulator",},
 161         {
 162                 .name = "rk805-pwrkey",
 163                 .num_resources = ARRAY_SIZE(rk817_pwrkey_resources),
 164                 .resources = &rk817_pwrkey_resources[0],
 165         },
 166         {
 167                 .name = "rk808-rtc",
 168                 .num_resources = ARRAY_SIZE(rk817_rtc_resources),
 169                 .resources = &rk817_rtc_resources[0],
 170         },
 171 };
 172
 173 static const struct mfd_cell rk818s[] = {
 174         { .name = "rk808-clkout", },
 175         { .name = "rk808-regulator", },
 176         {
 177                 .name = "rk808-rtc",
 178                 .num_resources = ARRAY_SIZE(rtc_resources),
 179                 .resources = rtc_resources,
 180         },
 181 };
 182
 183 static const struct rk808_reg_data rk805_pre_init_reg[] = {
 184         {RK805_BUCK1_CONFIG_REG, RK805_BUCK1_2_ILMAX_MASK,
 185                                  RK805_BUCK1_2_ILMAX_4000MA},
 186         {RK805_BUCK2_CONFIG_REG, RK805_BUCK1_2_ILMAX_MASK,
 187                                  RK805_BUCK1_2_ILMAX_4000MA},
 188         {RK805_BUCK3_CONFIG_REG, RK805_BUCK3_4_ILMAX_MASK,
 189                                  RK805_BUCK3_ILMAX_3000MA},
 190         {RK805_BUCK4_CONFIG_REG, RK805_BUCK3_4_ILMAX_MASK,
 191                                  RK805_BUCK4_ILMAX_3500MA},
 192         {RK805_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK, BUCK_ILMIN_400MA},
 193         {RK805_GPIO_IO_POL_REG, SLP_SD_MSK, SLEEP_FUN},
 194         {RK805_THERMAL_REG, TEMP_HOTDIE_MSK, TEMP115C},
 195 };
 196
 197 static const struct rk808_reg_data rk808_pre_init_reg[] = {
 198         { RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_150MA },
 199         { RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_200MA },
 200         { RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
 201         { RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK,  BUCK_ILMIN_200MA },
 202         { RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_200MA },
 203         { RK808_DCDC_UV_ACT_REG,  BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE},
 204         { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
 205                                                     VB_LO_SEL_3500MV },
 206 };
 207
 208 static const struct rk808_reg_data rk817_pre_init_reg[] = {
 209         {RK817_RTC_CTRL_REG, RTC_STOP, RTC_STOP},
 210         {RK817_GPIO_INT_CFG, RK817_INT_POL_MSK, RK817_INT_POL_L},
 211         {RK817_SYS_CFG(1), RK817_HOTDIE_TEMP_MSK | RK817_TSD_TEMP_MSK,
 212                                            RK817_HOTDIE_105 | RK817_TSD_140},
 213 };
 214
 215 static const struct rk808_reg_data rk818_pre_init_reg[] = {
 216         /* improve efficiency */
 217         { RK818_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_250MA },
 218         { RK818_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_250MA },
 219         { RK818_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
 220         { RK818_USB_CTRL_REG,     RK818_USB_ILIM_SEL_MASK,
 221                                                     RK818_USB_ILMIN_2000MA },
 222         /* close charger when usb lower then 3.4V */
 223         { RK818_USB_CTRL_REG,     RK818_USB_CHG_SD_VSEL_MASK,
 224                                                     (0x7 << 4) },
 225         /* no action when vref */
 226         { RK818_H5V_EN_REG,       BIT(1),           RK818_REF_RDY_CTRL },
 227         /* enable HDMI 5V */
 228         { RK818_H5V_EN_REG,       BIT(0),           RK818_H5V_EN },
 229         { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
 230                                                     VB_LO_SEL_3500MV },
 231 };
 232
 233 static const struct regmap_irq rk805_irqs[] = {
 234         [RK805_IRQ_PWRON_RISE] = {
 235                 .mask = RK805_IRQ_PWRON_RISE_MSK,
 236                 .reg_offset = 0,
 237         },
 238         [RK805_IRQ_VB_LOW] = {
 239                 .mask = RK805_IRQ_VB_LOW_MSK,
 240                 .reg_offset = 0,
 241         },
 242         [RK805_IRQ_PWRON] = {
 243                 .mask = RK805_IRQ_PWRON_MSK,
 244                 .reg_offset = 0,
 245         },
 246         [RK805_IRQ_PWRON_LP] = {
 247                 .mask = RK805_IRQ_PWRON_LP_MSK,
 248                 .reg_offset = 0,
 249         },
 250         [RK805_IRQ_HOTDIE] = {
 251                 .mask = RK805_IRQ_HOTDIE_MSK,
 252                 .reg_offset = 0,
 253         },
 254         [RK805_IRQ_RTC_ALARM] = {
 255                 .mask = RK805_IRQ_RTC_ALARM_MSK,
 256                 .reg_offset = 0,
 257         },
 258         [RK805_IRQ_RTC_PERIOD] = {
 259                 .mask = RK805_IRQ_RTC_PERIOD_MSK,
 260                 .reg_offset = 0,
 261         },
 262         [RK805_IRQ_PWRON_FALL] = {
 263                 .mask = RK805_IRQ_PWRON_FALL_MSK,
 264                 .reg_offset = 0,
 265         },
 266 };
 267
 268 static const struct regmap_irq rk808_irqs[] = {
 269         /* INT_STS */
 270         [RK808_IRQ_VOUT_LO] = {
 271                 .mask = RK808_IRQ_VOUT_LO_MSK,
 272                 .reg_offset = 0,
 273         },
 274         [RK808_IRQ_VB_LO] = {
 275                 .mask = RK808_IRQ_VB_LO_MSK,
 276                 .reg_offset = 0,
 277         },
 278         [RK808_IRQ_PWRON] = {
 279                 .mask = RK808_IRQ_PWRON_MSK,
 280                 .reg_offset = 0,
 281         },
 282         [RK808_IRQ_PWRON_LP] = {
 283                 .mask = RK808_IRQ_PWRON_LP_MSK,
 284                 .reg_offset = 0,
 285         },
 286         [RK808_IRQ_HOTDIE] = {
 287                 .mask = RK808_IRQ_HOTDIE_MSK,
 288                 .reg_offset = 0,
 289         },
 290         [RK808_IRQ_RTC_ALARM] = {
 291                 .mask = RK808_IRQ_RTC_ALARM_MSK,
 292                 .reg_offset = 0,
 293         },
 294         [RK808_IRQ_RTC_PERIOD] = {
 295                 .mask = RK808_IRQ_RTC_PERIOD_MSK,
 296                 .reg_offset = 0,
 297         },
 298
 299         /* INT_STS2 */
 300         [RK808_IRQ_PLUG_IN_INT] = {
 301                 .mask = RK808_IRQ_PLUG_IN_INT_MSK,
 302                 .reg_offset = 1,
 303         },
 304         [RK808_IRQ_PLUG_OUT_INT] = {
 305                 .mask = RK808_IRQ_PLUG_OUT_INT_MSK,
 306                 .reg_offset = 1,
 307         },
 308 };
 309
 310 static const struct regmap_irq rk818_irqs[] = {
 311         /* INT_STS */
 312         [RK818_IRQ_VOUT_LO] = {
 313                 .mask = RK818_IRQ_VOUT_LO_MSK,
 314                 .reg_offset = 0,
 315         },
 316         [RK818_IRQ_VB_LO] = {
 317                 .mask = RK818_IRQ_VB_LO_MSK,
 318                 .reg_offset = 0,
 319         },
 320         [RK818_IRQ_PWRON] = {
 321                 .mask = RK818_IRQ_PWRON_MSK,
 322                 .reg_offset = 0,
 323         },
 324         [RK818_IRQ_PWRON_LP] = {
 325                 .mask = RK818_IRQ_PWRON_LP_MSK,
 326                 .reg_offset = 0,
 327         },
 328         [RK818_IRQ_HOTDIE] = {
 329                 .mask = RK818_IRQ_HOTDIE_MSK,
 330                 .reg_offset = 0,
 331         },
 332         [RK818_IRQ_RTC_ALARM] = {
 333                 .mask = RK818_IRQ_RTC_ALARM_MSK,
 334                 .reg_offset = 0,
 335         },
 336         [RK818_IRQ_RTC_PERIOD] = {
 337                 .mask = RK818_IRQ_RTC_PERIOD_MSK,
 338                 .reg_offset = 0,
 339         },
 340         [RK818_IRQ_USB_OV] = {
 341                 .mask = RK818_IRQ_USB_OV_MSK,
 342                 .reg_offset = 0,
 343         },
 344
 345         /* INT_STS2 */
 346         [RK818_IRQ_PLUG_IN] = {
 347                 .mask = RK818_IRQ_PLUG_IN_MSK,
 348                 .reg_offset = 1,
 349         },
 350         [RK818_IRQ_PLUG_OUT] = {
 351                 .mask = RK818_IRQ_PLUG_OUT_MSK,
 352                 .reg_offset = 1,
 353         },
 354         [RK818_IRQ_CHG_OK] = {
 355                 .mask = RK818_IRQ_CHG_OK_MSK,
 356                 .reg_offset = 1,
 357         },
 358         [RK818_IRQ_CHG_TE] = {
 359                 .mask = RK818_IRQ_CHG_TE_MSK,
 360                 .reg_offset = 1,
 361         },
 362         [RK818_IRQ_CHG_TS1] = {
 363                 .mask = RK818_IRQ_CHG_TS1_MSK,
 364                 .reg_offset = 1,
 365         },
 366         [RK818_IRQ_TS2] = {
 367                 .mask = RK818_IRQ_TS2_MSK,
 368                 .reg_offset = 1,
 369         },
 370         [RK818_IRQ_CHG_CVTLIM] = {
 371                 .mask = RK818_IRQ_CHG_CVTLIM_MSK,
 372                 .reg_offset = 1,
 373         },
 374         [RK818_IRQ_DISCHG_ILIM] = {
 375                 .mask = RK818_IRQ_DISCHG_ILIM_MSK,
 376                 .reg_offset = 1,
 377         },
 378 };
 379
 380 static const struct regmap_irq rk817_irqs[RK817_IRQ_END] = {
 381         REGMAP_IRQ_REG_LINE(0, 8),
 382         REGMAP_IRQ_REG_LINE(1, 8),
 383         REGMAP_IRQ_REG_LINE(2, 8),
 384         REGMAP_IRQ_REG_LINE(3, 8),
 385         REGMAP_IRQ_REG_LINE(4, 8),
 386         REGMAP_IRQ_REG_LINE(5, 8),
 387         REGMAP_IRQ_REG_LINE(6, 8),
 388         REGMAP_IRQ_REG_LINE(7, 8),
 389         REGMAP_IRQ_REG_LINE(8, 8),
 390         REGMAP_IRQ_REG_LINE(9, 8),
 391         REGMAP_IRQ_REG_LINE(10, 8),
 392         REGMAP_IRQ_REG_LINE(11, 8),
 393         REGMAP_IRQ_REG_LINE(12, 8),
 394         REGMAP_IRQ_REG_LINE(13, 8),
 395         REGMAP_IRQ_REG_LINE(14, 8),
 396         REGMAP_IRQ_REG_LINE(15, 8),
 397         REGMAP_IRQ_REG_LINE(16, 8),
 398         REGMAP_IRQ_REG_LINE(17, 8),
 399         REGMAP_IRQ_REG_LINE(18, 8),
 400         REGMAP_IRQ_REG_LINE(19, 8),
 401         REGMAP_IRQ_REG_LINE(20, 8),
 402         REGMAP_IRQ_REG_LINE(21, 8),
 403         REGMAP_IRQ_REG_LINE(22, 8),
 404         REGMAP_IRQ_REG_LINE(23, 8)
 405 };
 406
 407 static struct regmap_irq_chip rk805_irq_chip = {
 408         .name = "rk805",
 409         .irqs = rk805_irqs,
 410         .num_irqs = ARRAY_SIZE(rk805_irqs),
 411         .num_regs = 1,
 412         .status_base = RK805_INT_STS_REG,
 413         .mask_base = RK805_INT_STS_MSK_REG,
 414         .ack_base = RK805_INT_STS_REG,
 415         .init_ack_masked = true,
 416 };
 417
 418 static const struct regmap_irq_chip rk808_irq_chip = {
 419         .name = "rk808",
 420         .irqs = rk808_irqs,
 421         .num_irqs = ARRAY_SIZE(rk808_irqs),
 422         .num_regs = 2,
 423         .irq_reg_stride = 2,
 424         .status_base = RK808_INT_STS_REG1,
 425         .mask_base = RK808_INT_STS_MSK_REG1,
 426         .ack_base = RK808_INT_STS_REG1,
 427         .init_ack_masked = true,
 428 };
 429
 430 static struct regmap_irq_chip rk817_irq_chip = {
 431         .name = "rk817",
 432         .irqs = rk817_irqs,
 433         .num_irqs = ARRAY_SIZE(rk817_irqs),
 434         .num_regs = 3,
 435         .irq_reg_stride = 2,
 436         .status_base = RK817_INT_STS_REG0,
 437         .mask_base = RK817_INT_STS_MSK_REG0,
 438         .ack_base = RK817_INT_STS_REG0,
 439         .init_ack_masked = true,
 440 };
 441
 442 static const struct regmap_irq_chip rk818_irq_chip = {
 443         .name = "rk818",
 444         .irqs = rk818_irqs,
 445         .num_irqs = ARRAY_SIZE(rk818_irqs),
 446         .num_regs = 2,
 447         .irq_reg_stride = 2,
 448         .status_base = RK818_INT_STS_REG1,
 449         .mask_base = RK818_INT_STS_MSK_REG1,
 450         .ack_base = RK818_INT_STS_REG1,
 451         .init_ack_masked = true,
 452 };
 453
 454 static struct i2c_client *rk808_i2c_client;
 455
 456 static void rk805_device_shutdown(void)
 457 {
 458         int ret;
 459         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 460
 461         if (!rk808)
 462                 return;
 463
 464         ret = regmap_update_bits(rk808->regmap,
 465                                  RK805_DEV_CTRL_REG,
 466                                  DEV_OFF, DEV_OFF);
 467         if (ret)
 468                 dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
 469 }
 470
 471 static void rk805_device_shutdown_prepare(void)
 472 {
 473         int ret;
 474         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 475
 476         if (!rk808)
 477                 return;
 478
 479         ret = regmap_update_bits(rk808->regmap,
 480                                  RK805_GPIO_IO_POL_REG,
 481                                  SLP_SD_MSK, SHUTDOWN_FUN);
 482         if (ret)
 483                 dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
 484 }
 485
 486 static void rk808_device_shutdown(void)
 487 {
 488         int ret;
 489         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 490
 491         if (!rk808)
 492                 return;
 493
 494         ret = regmap_update_bits(rk808->regmap,
 495                                  RK808_DEVCTRL_REG,
 496                                  DEV_OFF_RST, DEV_OFF_RST);
 497         if (ret)
 498                 dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
 499 }
 500
 501 static void rk818_device_shutdown(void)
 502 {
 503         int ret;
 504         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 505
 506         if (!rk808)
 507                 return;
 508
 509         ret = regmap_update_bits(rk808->regmap,
 510                                  RK818_DEVCTRL_REG,
 511                                  DEV_OFF, DEV_OFF);
 512         if (ret)
 513                 dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
 514 }
 515
 516 static void rk8xx_syscore_shutdown(void)
 517 {
 518         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 519         int ret;
 520
 521         if (system_state == SYSTEM_POWER_OFF &&
 522             (rk808->variant == RK809_ID || rk808->variant == RK817_ID)) {
 523                 ret = regmap_update_bits(rk808->regmap,
 524                                          RK817_SYS_CFG(3),
 525                                          RK817_SLPPIN_FUNC_MSK,
 526                                          SLPPIN_DN_FUN);
 527                 if (ret) {
 528                         dev_warn(&rk808_i2c_client->dev,
 529                                  "Cannot switch to power down function\n");
 530                 }
 531         }
 532 }
 533
 534 static struct syscore_ops rk808_syscore_ops = {
 535         .shutdown = rk8xx_syscore_shutdown,
 536 };
 537
 538 static const struct of_device_id rk808_of_match[] = {
 539         { .compatible = "rockchip,rk805" },
 540         { .compatible = "rockchip,rk808" },
 541         { .compatible = "rockchip,rk809" },
 542         { .compatible = "rockchip,rk817" },
 543         { .compatible = "rockchip,rk818" },
 544         { },
 545 };
 546 MODULE_DEVICE_TABLE(of, rk808_of_match);
 547
 548 static int rk808_probe(struct i2c_client *client,
 549                        const struct i2c_device_id *id)
 550 {
 551         struct device_node *np = client->dev.of_node;
 552         struct rk808 *rk808;
 553         const struct rk808_reg_data *pre_init_reg;
 554         const struct mfd_cell *cells;
 555         int nr_pre_init_regs;
 556         int nr_cells;
 557         int pm_off = 0, msb, lsb;
 558         unsigned char pmic_id_msb, pmic_id_lsb;
 559         int ret;
 560         int i;
 561
 562         rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
 563         if (!rk808)
 564                 return -ENOMEM;
 565
 566         if (of_device_is_compatible(np, "rockchip,rk817") ||
 567             of_device_is_compatible(np, "rockchip,rk809")) {
 568                 pmic_id_msb = RK817_ID_MSB;
 569                 pmic_id_lsb = RK817_ID_LSB;
 570         } else {
 571                 pmic_id_msb = RK808_ID_MSB;
 572                 pmic_id_lsb = RK808_ID_LSB;
 573         }
 574
 575         /* Read chip variant */
 576         msb = i2c_smbus_read_byte_data(client, pmic_id_msb);
 577         if (msb < 0) {
 578                 dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
 579                         RK808_ID_MSB);
 580                 return msb;
 581         }
 582
 583         lsb = i2c_smbus_read_byte_data(client, pmic_id_lsb);
 584         if (lsb < 0) {
 585                 dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
 586                         RK808_ID_LSB);
 587                 return lsb;
 588         }
 589
 590         rk808->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
 591         dev_info(&client->dev, "chip id: 0x%x\n", (unsigned int)rk808->variant);
 592
 593         switch (rk808->variant) {
 594         case RK805_ID:
 595                 rk808->regmap_cfg = &rk805_regmap_config;
 596                 rk808->regmap_irq_chip = &rk805_irq_chip;
 597                 pre_init_reg = rk805_pre_init_reg;
 598                 nr_pre_init_regs = ARRAY_SIZE(rk805_pre_init_reg);
 599                 cells = rk805s;
 600                 nr_cells = ARRAY_SIZE(rk805s);
 601                 rk808->pm_pwroff_fn = rk805_device_shutdown;
 602                 rk808->pm_pwroff_prep_fn = rk805_device_shutdown_prepare;
 603                 break;
 604         case RK808_ID:
 605                 rk808->regmap_cfg = &rk808_regmap_config;
 606                 rk808->regmap_irq_chip = &rk808_irq_chip;
 607                 pre_init_reg = rk808_pre_init_reg;
 608                 nr_pre_init_regs = ARRAY_SIZE(rk808_pre_init_reg);
 609                 cells = rk808s;
 610                 nr_cells = ARRAY_SIZE(rk808s);
 611                 rk808->pm_pwroff_fn = rk808_device_shutdown;
 612                 break;
 613         case RK818_ID:
 614                 rk808->regmap_cfg = &rk818_regmap_config;
 615                 rk808->regmap_irq_chip = &rk818_irq_chip;
 616                 pre_init_reg = rk818_pre_init_reg;
 617                 nr_pre_init_regs = ARRAY_SIZE(rk818_pre_init_reg);
 618                 cells = rk818s;
 619                 nr_cells = ARRAY_SIZE(rk818s);
 620                 rk808->pm_pwroff_fn = rk818_device_shutdown;
 621                 break;
 622         case RK809_ID:
 623         case RK817_ID:
 624                 rk808->regmap_cfg = &rk817_regmap_config;
 625                 rk808->regmap_irq_chip = &rk817_irq_chip;
 626                 pre_init_reg = rk817_pre_init_reg;
 627                 nr_pre_init_regs = ARRAY_SIZE(rk817_pre_init_reg);
 628                 cells = rk817s;
 629                 nr_cells = ARRAY_SIZE(rk817s);
 630                 register_syscore_ops(&rk808_syscore_ops);
 631                 break;
 632         default:
 633                 dev_err(&client->dev, "Unsupported RK8XX ID %lu\n",
 634                         rk808->variant);
 635                 return -EINVAL;
 636         }
 637
 638         rk808->i2c = client;
 639         i2c_set_clientdata(client, rk808);
 640
 641         rk808->regmap = devm_regmap_init_i2c(client, rk808->regmap_cfg);
 642         if (IS_ERR(rk808->regmap)) {
 643                 dev_err(&client->dev, "regmap initialization failed\n");
 644                 return PTR_ERR(rk808->regmap);
 645         }
 646
 647         if (!client->irq) {
 648                 dev_err(&client->dev, "No interrupt support, no core IRQ\n");
 649                 return -EINVAL;
 650         }
 651
 652         ret = regmap_add_irq_chip(rk808->regmap, client->irq,
 653                                   IRQF_ONESHOT, -1,
 654                                   rk808->regmap_irq_chip, &rk808->irq_data);
 655         if (ret) {
 656                 dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
 657                 return ret;
 658         }
 659
 660         for (i = 0; i < nr_pre_init_regs; i++) {
 661                 ret = regmap_update_bits(rk808->regmap,
 662                                         pre_init_reg[i].addr,
 663                                         pre_init_reg[i].mask,
 664                                         pre_init_reg[i].value);
 665                 if (ret) {
 666                         dev_err(&client->dev,
 667                                 "0x%x write err\n",
 668                                 pre_init_reg[i].addr);
 669                         return ret;
 670                 }
 671         }
 672
 673         ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
 674                               cells, nr_cells, NULL, 0,
 675                               regmap_irq_get_domain(rk808->irq_data));
 676         if (ret) {
 677                 dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
 678                 goto err_irq;
 679         }
 680
 681         pm_off = of_property_read_bool(np,
 682                                 "rockchip,system-power-controller");
 683         if (pm_off && !pm_power_off) {
 684                 rk808_i2c_client = client;
 685                 pm_power_off = rk808->pm_pwroff_fn;
 686         }
 687
 688         if (pm_off && !pm_power_off_prepare) {
 689                 if (!rk808_i2c_client)
 690                         rk808_i2c_client = client;
 691                 pm_power_off_prepare = rk808->pm_pwroff_prep_fn;
 692         }
 693
 694         return 0;
 695
 696 err_irq:
 697         regmap_del_irq_chip(client->irq, rk808->irq_data);
 698         return ret;
 699 }
 700
 701 static int rk808_remove(struct i2c_client *client)
 702 {
 703         struct rk808 *rk808 = i2c_get_clientdata(client);
 704
 705         regmap_del_irq_chip(client->irq, rk808->irq_data);
 706
 707         /**
 708          * pm_power_off may points to a function from another module.
 709          * Check if the pointer is set by us and only then overwrite it.
 710          */
 711         if (rk808->pm_pwroff_fn && pm_power_off == rk808->pm_pwroff_fn)
 712                 pm_power_off = NULL;
 713
 714         /**
 715          * As above, check if the pointer is set by us before overwrite.
 716          */
 717         if (rk808->pm_pwroff_prep_fn &&
 718             pm_power_off_prepare == rk808->pm_pwroff_prep_fn)
 719                 pm_power_off_prepare = NULL;
 720
 721         return 0;
 722 }
 723
 724 static int __maybe_unused rk8xx_suspend(struct device *dev)
 725 {
 726         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 727         int ret = 0;
 728
 729         switch (rk808->variant) {
 730         case RK809_ID:
 731         case RK817_ID:
 732                 ret = regmap_update_bits(rk808->regmap,
 733                                          RK817_SYS_CFG(3),
 734                                          RK817_SLPPIN_FUNC_MSK,
 735                                          SLPPIN_SLP_FUN);
 736                 break;
 737         default:
 738                 break;
 739         }
 740
 741         return ret;
 742 }
 743
 744 static int __maybe_unused rk8xx_resume(struct device *dev)
 745 {
 746         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 747         int ret = 0;
 748
 749         switch (rk808->variant) {
 750         case RK809_ID:
 751         case RK817_ID:
 752                 ret = regmap_update_bits(rk808->regmap,
 753                                          RK817_SYS_CFG(3),
 754                                          RK817_SLPPIN_FUNC_MSK,
 755                                          SLPPIN_NULL_FUN);
 756                 break;
 757         default:
 758                 break;
 759         }
 760
 761         return ret;
 762 }
 763 static SIMPLE_DEV_PM_OPS(rk8xx_pm_ops, rk8xx_suspend, rk8xx_resume);
 764
 765 static struct i2c_driver rk808_i2c_driver = {
 766         .driver = {
 767                 .name = "rk808",
 768                 .of_match_table = rk808_of_match,
 769                 .pm = &rk8xx_pm_ops,
 770         },
 771         .probe    = rk808_probe,
 772         .remove   = rk808_remove,
 773 };
 774
 775 module_i2c_driver(rk808_i2c_driver);
 776
 777 MODULE_LICENSE("GPL");
 778 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
 779 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
 780 MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
 781 MODULE_DESCRIPTION("RK808/RK818 PMIC driver");