drivers/regulator/da9121-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // DA9121 Single-channel dual-phase 10A buck converter
   4 //
   5 // Copyright (C) 2020 Axis Communications AB
   6 //
   7 // DA9130 Single-channel dual-phase 10A buck converter (Automotive)
   8 // DA9217 Single-channel dual-phase  6A buck converter
   9 // DA9122 Dual-channel single-phase  5A buck converter
  10 // DA9131 Dual-channel single-phase  5A buck converter (Automotive)
  11 // DA9220 Dual-channel single-phase  3A buck converter
  12 // DA9132 Dual-channel single-phase  3A buck converter (Automotive)
  13 //
  14 // Copyright (C) 2020 Dialog Semiconductor
  15
  16 #include <linux/of_device.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/regulator/of_regulator.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/module.h>
  23 #include <linux/regmap.h>
  24 #include <linux/err.h>
  25 #include <linux/i2c.h>
  26 #include <linux/regulator/da9121.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/workqueue.h>
  29
  30 #include "da9121-regulator.h"
  31
  32 /* Chip data */
  33 struct da9121 {
  34         struct device *dev;
  35         struct delayed_work work;
  36         struct da9121_pdata *pdata;
  37         struct regmap *regmap;
  38         struct regulator_dev *rdev[DA9121_IDX_MAX];
  39         unsigned int persistent[2];
  40         unsigned int passive_delay;
  41         int chip_irq;
  42         int variant_id;
  43 };
  44
  45 /* Define ranges for different variants, enabling translation to/from
  46  * registers. Maximums give scope to allow for transients.
  47  */
  48 struct da9121_range {
  49         int val_min;
  50         int val_max;
  51         int val_stp;
  52         int reg_min;
  53         int reg_max;
  54 };
  55
  56 static struct da9121_range da9121_10A_2phase_current = {
  57         .val_min =  7000000,
  58         .val_max = 20000000,
  59         .val_stp =  1000000,
  60         .reg_min = 1,
  61         .reg_max = 14,
  62 };
  63
  64 static struct da9121_range da9121_6A_2phase_current = {
  65         .val_min =  7000000,
  66         .val_max = 12000000,
  67         .val_stp =  1000000,
  68         .reg_min = 1,
  69         .reg_max = 6,
  70 };
  71
  72 static struct da9121_range da9121_5A_1phase_current = {
  73         .val_min =  3500000,
  74         .val_max = 10000000,
  75         .val_stp =   500000,
  76         .reg_min = 1,
  77         .reg_max = 14,
  78 };
  79
  80 static struct da9121_range da9121_3A_1phase_current = {
  81         .val_min = 3500000,
  82         .val_max = 6000000,
  83         .val_stp =  500000,
  84         .reg_min = 1,
  85         .reg_max = 6,
  86 };
  87
  88 struct da9121_variant_info {
  89         int num_bucks;
  90         int num_phases;
  91         struct da9121_range *current_range;
  92 };
  93
  94 static const struct da9121_variant_info variant_parameters[] = {
  95         { 1, 2, &da9121_10A_2phase_current },   //DA9121_TYPE_DA9121_DA9130
  96         { 2, 1, &da9121_3A_1phase_current  },   //DA9121_TYPE_DA9220_DA9132
  97         { 2, 1, &da9121_5A_1phase_current  },   //DA9121_TYPE_DA9122_DA9131
  98         { 1, 2, &da9121_6A_2phase_current  },   //DA9121_TYPE_DA9217
  99 };
 100
 101 struct da9121_field {
 102         unsigned int reg;
 103         unsigned int msk;
 104 };
 105
 106 static const struct da9121_field da9121_current_field[2] = {
 107         { DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
 108         { DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
 109 };
 110
 111 static const struct da9121_field da9121_mode_field[2] = {
 112         { DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
 113         { DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
 114 };
 115
 116 struct status_event_data {
 117         int buck_id; /* 0=core, 1/2-buck */
 118         int reg_index;  /* index for status/event/mask register selection */
 119         int status_bit; /* bit masks... */
 120         int event_bit;
 121         int mask_bit;
 122         unsigned long notification; /* Notification for status inception */
 123         char *warn; /* if NULL, notify - otherwise dev_warn this string */
 124 };
 125
 126 #define DA9121_STATUS(id, bank, name, notification, warning) \
 127         { id, bank, \
 128         DA9121_MASK_SYS_STATUS_##bank##_##name, \
 129         DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
 130         DA9121_MASK_SYS_MASK_##bank##_M_##name, \
 131         notification, warning }
 132
 133 /* For second buck related event bits that are specific to DA9122, DA9220 variants */
 134 #define DA9xxx_STATUS(id, bank, name, notification, warning) \
 135         { id, bank, \
 136         DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
 137         DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
 138         DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
 139         notification, warning }
 140
 141 /* The status signals that may need servicing, depending on device variant.
 142  * After assertion, they persist; so event is notified, the IRQ disabled,
 143  * and status polled until clear again and IRQ is reenabled.
 144  *
 145  * SG/PG1/PG2 should be set when device first powers up and should never
 146  * re-occur. When this driver starts, it is expected that these will have
 147  * self-cleared for when the IRQs are enabled, so these should never be seen.
 148  * If seen, the implication is that the device has reset.
 149  *
 150  * GPIO0/1/2 are not configured for use by default, so should not be seen.
 151  */
 152 static const struct status_event_data status_event_handling[] = {
 153         DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
 154         DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
 155         DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
 156         DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
 157         DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
 158         DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
 159         DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
 160         DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
 161         DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
 162         DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
 163         DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
 164         DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
 165         DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
 166         DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
 167 };
 168
 169 static int da9121_get_current_limit(struct regulator_dev *rdev)
 170 {
 171         struct da9121 *chip = rdev_get_drvdata(rdev);
 172         int id = rdev_get_id(rdev);
 173         struct da9121_range *range =
 174                 variant_parameters[chip->variant_id].current_range;
 175         unsigned int val = 0;
 176         int ret = 0;
 177
 178         ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
 179         if (ret < 0) {
 180                 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
 181                 goto error;
 182         }
 183
 184         if (val < range->reg_min) {
 185                 ret = -EACCES;
 186                 goto error;
 187         }
 188
 189         if (val > range->reg_max) {
 190                 ret = -EINVAL;
 191                 goto error;
 192         }
 193
 194         return range->val_min + (range->val_stp * (val - range->reg_min));
 195 error:
 196         return ret;
 197 }
 198
 199 static int da9121_ceiling_selector(struct regulator_dev *rdev,
 200                 int min, int max,
 201                 unsigned int *selector)
 202 {
 203         struct da9121 *chip = rdev_get_drvdata(rdev);
 204         struct da9121_range *range =
 205                 variant_parameters[chip->variant_id].current_range;
 206         unsigned int level;
 207         unsigned int i = 0;
 208         unsigned int sel = 0;
 209         int ret = 0;
 210
 211         if (range->val_min > max || range->val_max < min) {
 212                 dev_err(chip->dev,
 213                         "Requested current out of regulator capability\n");
 214                 ret = -EINVAL;
 215                 goto error;
 216         }
 217
 218         level = range->val_max;
 219         for (i = range->reg_max; i >= range->reg_min; i--) {
 220                 if (level <= max) {
 221                         sel = i;
 222                         break;
 223                 }
 224                 level -= range->val_stp;
 225         }
 226
 227         if (level < min) {
 228                 dev_err(chip->dev,
 229                         "Best match falls below minimum requested current\n");
 230                 ret = -EINVAL;
 231                 goto error;
 232         }
 233
 234         *selector = sel;
 235 error:
 236         return ret;
 237 }
 238
 239 static int da9121_set_current_limit(struct regulator_dev *rdev,
 240                                 int min_ua, int max_ua)
 241 {
 242         struct da9121 *chip = rdev_get_drvdata(rdev);
 243         int id = rdev_get_id(rdev);
 244         struct da9121_range *range =
 245                 variant_parameters[chip->variant_id].current_range;
 246         unsigned int sel = 0;
 247         int ret = 0;
 248
 249         if (min_ua < range->val_min ||
 250             max_ua > range->val_max) {
 251                 ret = -EINVAL;
 252                 goto error;
 253         }
 254
 255         ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
 256         if (ret < 0)
 257                 goto error;
 258
 259         ret = regmap_update_bits(chip->regmap,
 260                                 da9121_current_field[id].reg,
 261                                 da9121_current_field[id].msk,
 262                                 (unsigned int)sel);
 263         if (ret < 0)
 264                 dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
 265
 266 error:
 267         return ret;
 268 }
 269
 270 static unsigned int da9121_map_mode(unsigned int mode)
 271 {
 272         switch (mode) {
 273         case DA9121_BUCK_MODE_FORCE_PWM:
 274                 return REGULATOR_MODE_FAST;
 275         case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
 276                 return REGULATOR_MODE_NORMAL;
 277         case DA9121_BUCK_MODE_AUTO:
 278                 return REGULATOR_MODE_IDLE;
 279         case DA9121_BUCK_MODE_FORCE_PFM:
 280                 return REGULATOR_MODE_STANDBY;
 281         default:
 282                 return -EINVAL;
 283         }
 284 }
 285
 286 static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
 287 {
 288         struct da9121 *chip = rdev_get_drvdata(rdev);
 289         int id = rdev_get_id(rdev);
 290         unsigned int val;
 291
 292         switch (mode) {
 293         case REGULATOR_MODE_FAST:
 294                 val = DA9121_BUCK_MODE_FORCE_PWM;
 295                 break;
 296         case REGULATOR_MODE_NORMAL:
 297                 val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
 298                 break;
 299         case REGULATOR_MODE_IDLE:
 300                 val = DA9121_BUCK_MODE_AUTO;
 301                 break;
 302         case REGULATOR_MODE_STANDBY:
 303                 val = DA9121_BUCK_MODE_FORCE_PFM;
 304                 break;
 305         default:
 306                 return -EINVAL;
 307         }
 308
 309         return regmap_update_bits(chip->regmap,
 310                                   da9121_mode_field[id].reg,
 311                                   da9121_mode_field[id].msk,
 312                                   val);
 313 }
 314
 315 static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
 316 {
 317         struct da9121 *chip = rdev_get_drvdata(rdev);
 318         int id = rdev_get_id(rdev);
 319         unsigned int val;
 320         int ret = 0;
 321
 322         ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
 323         if (ret < 0) {
 324                 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
 325                 return -EINVAL;
 326         }
 327
 328         return da9121_map_mode(val & da9121_mode_field[id].msk);
 329 }
 330
 331 static const struct regulator_ops da9121_buck_ops = {
 332         .enable = regulator_enable_regmap,
 333         .disable = regulator_disable_regmap,
 334         .is_enabled = regulator_is_enabled_regmap,
 335         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 336         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 337         .list_voltage = regulator_list_voltage_linear,
 338         .get_current_limit = da9121_get_current_limit,
 339         .set_current_limit = da9121_set_current_limit,
 340         .set_mode = da9121_buck_set_mode,
 341         .get_mode = da9121_buck_get_mode,
 342 };
 343
 344 static struct of_regulator_match da9121_matches[] = {
 345         [DA9121_IDX_BUCK1] = { .name = "buck1" },
 346         [DA9121_IDX_BUCK2] = { .name = "buck2" },
 347 };
 348
 349 static int da9121_of_parse_cb(struct device_node *np,
 350                                 const struct regulator_desc *desc,
 351                                 struct regulator_config *config)
 352 {
 353         struct da9121 *chip = config->driver_data;
 354         struct da9121_pdata *pdata;
 355         struct gpio_desc *ena_gpiod;
 356
 357         if (chip->pdata == NULL) {
 358                 pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
 359                 if (!pdata)
 360                         return -ENOMEM;
 361         } else {
 362                 pdata = chip->pdata;
 363         }
 364
 365         pdata->num_buck++;
 366
 367         if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
 368                 dev_err(chip->dev, "Error: excessive regulators for device\n");
 369                 return -ENODEV;
 370         }
 371
 372         ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
 373                                                 GPIOD_OUT_HIGH |
 374                                                 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
 375                                                 "da9121-enable");
 376         if (!IS_ERR(ena_gpiod))
 377                 config->ena_gpiod = ena_gpiod;
 378
 379         if (variant_parameters[chip->variant_id].num_bucks == 2) {
 380                 uint32_t ripple_cancel;
 381                 uint32_t ripple_reg;
 382                 int ret;
 383
 384                 if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
 385                                 "dlg,ripple-cancel", &ripple_cancel)) {
 386                         if (pdata->num_buck > 1)
 387                                 ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
 388                         else
 389                                 ripple_reg = DA9121_REG_BUCK_BUCK1_7;
 390
 391                         ret = regmap_update_bits(chip->regmap, ripple_reg,
 392                                 DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
 393                                 ripple_cancel);
 394                         if (ret < 0)
 395                                 dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
 396                 }
 397         }
 398
 399         return 0;
 400 }
 401
 402 #define DA9121_MIN_MV           300
 403 #define DA9121_MAX_MV           1900
 404 #define DA9121_STEP_MV          10
 405 #define DA9121_MIN_SEL          (DA9121_MIN_MV / DA9121_STEP_MV)
 406 #define DA9121_N_VOLTAGES       (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
 407                                  + 1 + DA9121_MIN_SEL)
 408
 409 static const struct regulator_desc da9121_reg = {
 410         .id = DA9121_IDX_BUCK1,
 411         .name = "da9121",
 412         .of_match = "buck1",
 413         .of_parse_cb = da9121_of_parse_cb,
 414         .owner = THIS_MODULE,
 415         .regulators_node = of_match_ptr("regulators"),
 416         .of_map_mode = da9121_map_mode,
 417         .ops = &da9121_buck_ops,
 418         .type = REGULATOR_VOLTAGE,
 419         .n_voltages = DA9121_N_VOLTAGES,
 420         .min_uV = DA9121_MIN_MV * 1000,
 421         .uV_step = DA9121_STEP_MV * 1000,
 422         .linear_min_sel = DA9121_MIN_SEL,
 423         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 424         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 425         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 426         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 427         /* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
 428         .ramp_delay = 20000,
 429         /* tBUCK_EN */
 430         .enable_time = 20,
 431 };
 432
 433 static const struct regulator_desc da9220_reg[2] = {
 434         {
 435                 .id = DA9121_IDX_BUCK1,
 436                 .name = "DA9220/DA9132 BUCK1",
 437                 .of_match = "buck1",
 438                 .of_parse_cb = da9121_of_parse_cb,
 439                 .owner = THIS_MODULE,
 440                 .regulators_node = of_match_ptr("regulators"),
 441                 .of_map_mode = da9121_map_mode,
 442                 .ops = &da9121_buck_ops,
 443                 .type = REGULATOR_VOLTAGE,
 444                 .n_voltages = DA9121_N_VOLTAGES,
 445                 .min_uV = DA9121_MIN_MV * 1000,
 446                 .uV_step = DA9121_STEP_MV * 1000,
 447                 .linear_min_sel = DA9121_MIN_SEL,
 448                 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 449                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 450                 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 451                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 452         },
 453         {
 454                 .id = DA9121_IDX_BUCK2,
 455                 .name = "DA9220/DA9132 BUCK2",
 456                 .of_match = "buck2",
 457                 .of_parse_cb = da9121_of_parse_cb,
 458                 .owner = THIS_MODULE,
 459                 .regulators_node = of_match_ptr("regulators"),
 460                 .of_map_mode = da9121_map_mode,
 461                 .ops = &da9121_buck_ops,
 462                 .type = REGULATOR_VOLTAGE,
 463                 .n_voltages = DA9121_N_VOLTAGES,
 464                 .min_uV = DA9121_MIN_MV * 1000,
 465                 .uV_step = DA9121_STEP_MV * 1000,
 466                 .linear_min_sel = DA9121_MIN_SEL,
 467                 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
 468                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 469                 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
 470                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 471         }
 472 };
 473
 474 static const struct regulator_desc da9122_reg[2] = {
 475         {
 476                 .id = DA9121_IDX_BUCK1,
 477                 .name = "DA9122/DA9131 BUCK1",
 478                 .of_match = "buck1",
 479                 .of_parse_cb = da9121_of_parse_cb,
 480                 .owner = THIS_MODULE,
 481                 .regulators_node = of_match_ptr("regulators"),
 482                 .of_map_mode = da9121_map_mode,
 483                 .ops = &da9121_buck_ops,
 484                 .type = REGULATOR_VOLTAGE,
 485                 .n_voltages = DA9121_N_VOLTAGES,
 486                 .min_uV = DA9121_MIN_MV * 1000,
 487                 .uV_step = DA9121_STEP_MV * 1000,
 488                 .linear_min_sel = DA9121_MIN_SEL,
 489                 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 490                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 491                 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 492                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 493         },
 494         {
 495                 .id = DA9121_IDX_BUCK2,
 496                 .name = "DA9122/DA9131 BUCK2",
 497                 .of_match = "buck2",
 498                 .of_parse_cb = da9121_of_parse_cb,
 499                 .owner = THIS_MODULE,
 500                 .regulators_node = of_match_ptr("regulators"),
 501                 .of_map_mode = da9121_map_mode,
 502                 .ops = &da9121_buck_ops,
 503                 .type = REGULATOR_VOLTAGE,
 504                 .n_voltages = DA9121_N_VOLTAGES,
 505                 .min_uV = DA9121_MIN_MV * 1000,
 506                 .uV_step = DA9121_STEP_MV * 1000,
 507                 .linear_min_sel = DA9121_MIN_SEL,
 508                 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
 509                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 510                 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
 511                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 512         }
 513 };
 514
 515 static const struct regulator_desc da9217_reg = {
 516         .id = DA9121_IDX_BUCK1,
 517         .name = "DA9217 BUCK1",
 518         .of_match = "buck1",
 519         .of_parse_cb = da9121_of_parse_cb,
 520         .owner = THIS_MODULE,
 521         .regulators_node = of_match_ptr("regulators"),
 522         .of_map_mode = da9121_map_mode,
 523         .ops = &da9121_buck_ops,
 524         .type = REGULATOR_VOLTAGE,
 525         .n_voltages = DA9121_N_VOLTAGES,
 526         .min_uV = DA9121_MIN_MV * 1000,
 527         .uV_step = DA9121_STEP_MV * 1000,
 528         .linear_min_sel = DA9121_MIN_SEL,
 529         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 530         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 531         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 532         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 533 };
 534
 535 static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
 536         [DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
 537         [DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
 538         [DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
 539         [DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
 540 };
 541
 542 static void da9121_status_poll_on(struct work_struct *work)
 543 {
 544         struct da9121 *chip = container_of(work, struct da9121, work.work);
 545         int status[3] = {0};
 546         int clear[3] = {0};
 547         unsigned long delay;
 548         int i;
 549         int ret;
 550
 551         ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
 552         if (ret < 0) {
 553                 dev_err(chip->dev,
 554                         "Failed to read STATUS registers: %d\n", ret);
 555                 goto error;
 556         }
 557
 558         /* Possible events are tested to be within range for the variant, potentially
 559          * masked by the IRQ handler (not just warned about), as having been masked,
 560          * and the respective state cleared - then flagged to unmask for next IRQ.
 561          */
 562         for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
 563                 const struct status_event_data *item = &status_event_handling[i];
 564                 int reg_idx = item->reg_index;
 565                 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
 566                 bool supported = (item->warn == NULL);
 567                 bool persisting = (chip->persistent[reg_idx] & item->event_bit);
 568                 bool now_cleared = !(status[reg_idx] & item->status_bit);
 569
 570                 if (relevant && supported && persisting && now_cleared) {
 571                         clear[reg_idx] |= item->mask_bit;
 572                         chip->persistent[reg_idx] &= ~item->event_bit;
 573                 }
 574         }
 575
 576         for (i = 0; i < 2; i++) {
 577                 if (clear[i]) {
 578                         unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
 579                         unsigned int mbit = clear[i];
 580
 581                         ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
 582                         if (ret < 0) {
 583                                 dev_err(chip->dev,
 584                                         "Failed to unmask 0x%02x %d\n",
 585                                         reg, ret);
 586                                 goto error;
 587                         }
 588                 }
 589         }
 590
 591         if (chip->persistent[0] | chip->persistent[1]) {
 592                 delay = msecs_to_jiffies(chip->passive_delay);
 593                 queue_delayed_work(system_freezable_wq, &chip->work, delay);
 594         }
 595
 596 error:
 597         return;
 598 }
 599
 600 static irqreturn_t da9121_irq_handler(int irq, void *data)
 601 {
 602         struct da9121 *chip = data;
 603         struct regulator_dev *rdev;
 604         int event[3] = {0};
 605         int handled[3] = {0};
 606         int mask[3] = {0};
 607         int ret = IRQ_NONE;
 608         int i;
 609         int err;
 610
 611         err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
 612         if (err < 0) {
 613                 dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
 614                 ret = IRQ_NONE;
 615                 goto error;
 616         }
 617
 618         err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
 619         if (err < 0) {
 620                 dev_err(chip->dev,
 621                         "Failed to read MASK registers: %d\n", ret);
 622                 ret = IRQ_NONE;
 623                 goto error;
 624         }
 625
 626         rdev = chip->rdev[DA9121_IDX_BUCK1];
 627
 628         /* Possible events are tested to be within range for the variant, currently
 629          * enabled, and having triggered this IRQ. The event may then be notified,
 630          * or a warning given for unexpected events - those from device POR, and
 631          * currently unsupported GPIO configurations.
 632          */
 633         for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
 634                 const struct status_event_data *item = &status_event_handling[i];
 635                 int reg_idx = item->reg_index;
 636                 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
 637                 bool enabled = !(mask[reg_idx] & item->mask_bit);
 638                 bool active = (event[reg_idx] & item->event_bit);
 639                 bool notify = (item->warn == NULL);
 640
 641                 if (relevant && enabled && active) {
 642                         if (notify) {
 643                                 chip->persistent[reg_idx] |= item->event_bit;
 644                                 regulator_notifier_call_chain(rdev, item->notification, NULL);
 645                         } else {
 646                                 dev_warn(chip->dev, item->warn);
 647                                 handled[reg_idx] |= item->event_bit;
 648                                 ret = IRQ_HANDLED;
 649                         }
 650                 }
 651         }
 652
 653         for (i = 0; i < 3; i++) {
 654                 if (event[i] != handled[i]) {
 655                         dev_warn(chip->dev,
 656                                 "Unhandled event(s) in bank%d 0x%02x\n", i,
 657                                 event[i] ^ handled[i]);
 658                 }
 659         }
 660
 661         /* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
 662         for (i = 0; i < 2; i++) {
 663                 if (handled[i]) {
 664                         unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
 665                         unsigned int mbit = handled[i];
 666
 667                         err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
 668                         if (err < 0) {
 669                                 dev_err(chip->dev,
 670                                         "Failed to mask 0x%02x interrupt %d\n",
 671                                         reg, err);
 672                                 ret = IRQ_NONE;
 673                                 goto error;
 674                         }
 675                 }
 676         }
 677
 678         /* clear the events */
 679         if (handled[0] | handled[1] | handled[2]) {
 680                 err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
 681                 if (err < 0) {
 682                         dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
 683                         ret = IRQ_NONE;
 684                         goto error;
 685                 }
 686         }
 687
 688         queue_delayed_work(system_freezable_wq, &chip->work, 0);
 689 error:
 690         return ret;
 691 }
 692
 693 static int da9121_set_regulator_config(struct da9121 *chip)
 694 {
 695         struct regulator_config config = { };
 696         unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
 697         int ret = 0;
 698         int i;
 699
 700         for (i = 0; i < max_matches; i++) {
 701                 const struct regulator_desc *regl_desc =
 702                         local_da9121_regulators[chip->variant_id][i];
 703
 704                 config.dev = chip->dev;
 705                 config.driver_data = chip;
 706                 config.regmap = chip->regmap;
 707
 708                 chip->rdev[i] = devm_regulator_register(chip->dev,
 709                                         regl_desc, &config);
 710                 if (IS_ERR(chip->rdev[i])) {
 711                         dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
 712                                 regl_desc->name, (i+1), max_matches);
 713                         ret = PTR_ERR(chip->rdev[i]);
 714                         goto error;
 715                 }
 716         }
 717
 718 error:
 719         return ret;
 720 }
 721
 722 /* DA9121 chip register model */
 723 static const struct regmap_range da9121_1ch_readable_ranges[] = {
 724         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
 725         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 726         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 727         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
 728         regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
 729 };
 730
 731 static const struct regmap_access_table da9121_1ch_readable_table = {
 732         .yes_ranges = da9121_1ch_readable_ranges,
 733         .n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
 734 };
 735
 736 static const struct regmap_range da9121_2ch_readable_ranges[] = {
 737         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
 738         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 739         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 740         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
 741         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
 742         regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
 743 };
 744
 745 static const struct regmap_access_table da9121_2ch_readable_table = {
 746         .yes_ranges = da9121_2ch_readable_ranges,
 747         .n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
 748 };
 749
 750 static const struct regmap_range da9121_1ch_writeable_ranges[] = {
 751         regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
 752         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 753         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 754         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
 755         regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
 756 };
 757
 758 static const struct regmap_access_table da9121_1ch_writeable_table = {
 759         .yes_ranges = da9121_1ch_writeable_ranges,
 760         .n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
 761 };
 762
 763 static const struct regmap_range da9121_2ch_writeable_ranges[] = {
 764         regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
 765         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 766         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 767         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
 768         regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
 769         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
 770         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
 771 };
 772
 773 static const struct regmap_access_table da9121_2ch_writeable_table = {
 774         .yes_ranges = da9121_2ch_writeable_ranges,
 775         .n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
 776 };
 777
 778
 779 static const struct regmap_range da9121_volatile_ranges[] = {
 780         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
 781         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 782         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
 783 };
 784
 785 static const struct regmap_access_table da9121_volatile_table = {
 786         .yes_ranges = da9121_volatile_ranges,
 787         .n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
 788 };
 789
 790 /* DA9121 regmap config for 1 channel variants */
 791 static struct regmap_config da9121_1ch_regmap_config = {
 792         .reg_bits = 8,
 793         .val_bits = 8,
 794         .max_register = DA9121_REG_OTP_CONFIG_ID,
 795         .rd_table = &da9121_1ch_readable_table,
 796         .wr_table = &da9121_1ch_writeable_table,
 797         .volatile_table = &da9121_volatile_table,
 798         .cache_type = REGCACHE_RBTREE,
 799 };
 800
 801 /* DA9121 regmap config for 2 channel variants */
 802 static struct regmap_config da9121_2ch_regmap_config = {
 803         .reg_bits = 8,
 804         .val_bits = 8,
 805         .max_register = DA9121_REG_OTP_CONFIG_ID,
 806         .rd_table = &da9121_2ch_readable_table,
 807         .wr_table = &da9121_2ch_writeable_table,
 808         .volatile_table = &da9121_volatile_table,
 809         .cache_type = REGCACHE_RBTREE,
 810 };
 811
 812 static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
 813 {
 814         u32 device_id;
 815         u8 chip_id = chip->variant_id;
 816         u32 variant_id;
 817         u8 variant_mrc, variant_vrc;
 818         char *type;
 819         bool config_match = false;
 820         int ret = 0;
 821
 822         ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
 823         if (ret < 0) {
 824                 dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
 825                 goto error;
 826         }
 827
 828         ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
 829         if (ret < 0) {
 830                 dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
 831                 goto error;
 832         }
 833
 834         if (device_id != DA9121_DEVICE_ID) {
 835                 dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
 836                 ret = -ENODEV;
 837                 goto error;
 838         }
 839
 840         variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
 841
 842         switch (variant_vrc) {
 843         case DA9121_VARIANT_VRC:
 844                 type = "DA9121/DA9130";
 845                 config_match = (chip_id == DA9121_TYPE_DA9121_DA9130);
 846                 break;
 847         case DA9220_VARIANT_VRC:
 848                 type = "DA9220/DA9132";
 849                 config_match = (chip_id == DA9121_TYPE_DA9220_DA9132);
 850                 break;
 851         case DA9122_VARIANT_VRC:
 852                 type = "DA9122/DA9131";
 853                 config_match = (chip_id == DA9121_TYPE_DA9122_DA9131);
 854                 break;
 855         case DA9217_VARIANT_VRC:
 856                 type = "DA9217";
 857                 config_match = (chip_id == DA9121_TYPE_DA9217);
 858                 break;
 859         default:
 860                 type = "Unknown";
 861                 break;
 862         }
 863
 864         dev_info(chip->dev,
 865                  "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
 866                  device_id, variant_id, type);
 867
 868         if (!config_match) {
 869                 dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
 870                 ret = -EINVAL;
 871                 goto error;
 872         }
 873
 874         variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
 875                         >> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
 876
 877         if ((device_id == DA9121_DEVICE_ID) &&
 878             (variant_mrc < DA9121_VARIANT_MRC_BASE)) {
 879                 dev_err(chip->dev,
 880                         "Cannot support variant MRC: 0x%02X\n", variant_mrc);
 881                 ret = -EINVAL;
 882         }
 883 error:
 884         return ret;
 885 }
 886
 887 static int da9121_assign_chip_model(struct i2c_client *i2c,
 888                         struct da9121 *chip)
 889 {
 890         struct regmap_config *regmap;
 891         int ret = 0;
 892
 893         chip->dev = &i2c->dev;
 894
 895         switch (chip->variant_id) {
 896         case DA9121_TYPE_DA9121_DA9130:
 897                 fallthrough;
 898         case DA9121_TYPE_DA9217:
 899                 regmap = &da9121_1ch_regmap_config;
 900                 break;
 901         case DA9121_TYPE_DA9122_DA9131:
 902                 fallthrough;
 903         case DA9121_TYPE_DA9220_DA9132:
 904                 regmap = &da9121_2ch_regmap_config;
 905                 break;
 906         }
 907
 908         /* Set these up for of_regulator_match call which may want .of_map_modes */
 909         da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
 910         da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
 911
 912         chip->regmap = devm_regmap_init_i2c(i2c, regmap);
 913         if (IS_ERR(chip->regmap)) {
 914                 ret = PTR_ERR(chip->regmap);
 915                 dev_err(chip->dev, "Failed to configure a register map: %d\n",
 916                         ret);
 917                 return ret;
 918         }
 919
 920         ret = da9121_check_device_type(i2c, chip);
 921
 922         return ret;
 923 }
 924
 925 static int da9121_config_irq(struct i2c_client *i2c,
 926                         struct da9121 *chip)
 927 {
 928         unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
 929         const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
 930         int ret = 0;
 931
 932         chip->chip_irq = i2c->irq;
 933
 934         if (chip->chip_irq != 0) {
 935                 if (!of_property_read_u32(chip->dev->of_node,
 936                                           "dlg,irq-polling-delay-passive-ms",
 937                                           &p_delay)) {
 938                         if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
 939                             p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
 940                                 dev_warn(chip->dev,
 941                                          "Out-of-range polling period %d ms\n",
 942                                          p_delay);
 943                                 p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
 944                         }
 945                 }
 946
 947                 chip->passive_delay = p_delay;
 948
 949                 ret = request_threaded_irq(chip->chip_irq, NULL,
 950                                         da9121_irq_handler,
 951                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 952                                         "da9121", chip);
 953                 if (ret != 0) {
 954                         dev_err(chip->dev, "Failed IRQ request: %d\n",
 955                                 chip->chip_irq);
 956                         goto error;
 957                 }
 958
 959                 ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
 960                 if (ret != 0) {
 961                         dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
 962                                 ret);
 963                         goto regmap_error;
 964                 }
 965
 966                 INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
 967                 dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
 968                          chip->passive_delay);
 969         }
 970 error:
 971         return ret;
 972 regmap_error:
 973         free_irq(chip->chip_irq, chip);
 974         return ret;
 975 }
 976
 977 static const struct of_device_id da9121_dt_ids[] = {
 978         { .compatible = "dlg,da9121", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
 979         { .compatible = "dlg,da9130", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
 980         { .compatible = "dlg,da9217", .data = (void *) DA9121_TYPE_DA9217 },
 981         { .compatible = "dlg,da9122", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
 982         { .compatible = "dlg,da9131", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
 983         { .compatible = "dlg,da9220", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
 984         { .compatible = "dlg,da9132", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
 985         { }
 986 };
 987 MODULE_DEVICE_TABLE(of, da9121_dt_ids);
 988
 989 static inline int da9121_of_get_id(struct device *dev)
 990 {
 991         const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
 992
 993         if (!id) {
 994                 dev_err(dev, "%s: Failed\n", __func__);
 995                 return -EINVAL;
 996         }
 997         return (uintptr_t)id->data;
 998 }
 999
1000 static int da9121_i2c_probe(struct i2c_client *i2c,
1001                             const struct i2c_device_id *id)
1002 {
1003         struct da9121 *chip;
1004         const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1005         int ret = 0;
1006
1007         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
1008         if (!chip) {
1009                 ret = -ENOMEM;
1010                 goto error;
1011         }
1012
1013         chip->pdata = i2c->dev.platform_data;
1014         chip->variant_id = da9121_of_get_id(&i2c->dev);
1015
1016         ret = da9121_assign_chip_model(i2c, chip);
1017         if (ret < 0)
1018                 goto error;
1019
1020         ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1021         if (ret != 0) {
1022                 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1023                 goto error;
1024         }
1025
1026         ret = da9121_set_regulator_config(chip);
1027         if (ret < 0)
1028                 goto error;
1029
1030         ret = da9121_config_irq(i2c, chip);
1031
1032 error:
1033         return ret;
1034 }
1035
1036 static int da9121_i2c_remove(struct i2c_client *i2c)
1037 {
1038         struct da9121 *chip = i2c_get_clientdata(i2c);
1039         const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1040         int ret = 0;
1041
1042         free_irq(chip->chip_irq, chip);
1043         cancel_delayed_work_sync(&chip->work);
1044
1045         ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1046         if (ret != 0)
1047                 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1048         return ret;
1049 }
1050
1051 static const struct i2c_device_id da9121_i2c_id[] = {
1052         {"da9121", DA9121_TYPE_DA9121_DA9130},
1053         {"da9130", DA9121_TYPE_DA9121_DA9130},
1054         {"da9217", DA9121_TYPE_DA9217},
1055         {"da9122", DA9121_TYPE_DA9122_DA9131},
1056         {"da9131", DA9121_TYPE_DA9122_DA9131},
1057         {"da9220", DA9121_TYPE_DA9220_DA9132},
1058         {"da9132", DA9121_TYPE_DA9220_DA9132},
1059         {},
1060 };
1061 MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
1062
1063 static struct i2c_driver da9121_regulator_driver = {
1064         .driver = {
1065                 .name = "da9121",
1066                 .of_match_table = of_match_ptr(da9121_dt_ids),
1067         },
1068         .probe = da9121_i2c_probe,
1069         .remove = da9121_i2c_remove,
1070         .id_table = da9121_i2c_id,
1071 };
1072
1073 module_i2c_driver(da9121_regulator_driver);
1074
1075 MODULE_LICENSE("GPL v2");