linux/drivers/regulator/ltc3589.c
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   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Linear Technology LTC3589,LTC3589-1 regulator support
   4//
   5// Copyright (c) 2014 Philipp Zabel <p.zabel@pengutronix.de>, Pengutronix
   6
   7#include <linux/i2c.h>
   8#include <linux/init.h>
   9#include <linux/interrupt.h>
  10#include <linux/module.h>
  11#include <linux/kernel.h>
  12#include <linux/of.h>
  13#include <linux/of_device.h>
  14#include <linux/regmap.h>
  15#include <linux/regulator/driver.h>
  16#include <linux/regulator/of_regulator.h>
  17
  18#define DRIVER_NAME             "ltc3589"
  19
  20#define LTC3589_IRQSTAT         0x02
  21#define LTC3589_SCR1            0x07
  22#define LTC3589_OVEN            0x10
  23#define LTC3589_SCR2            0x12
  24#define LTC3589_PGSTAT          0x13
  25#define LTC3589_VCCR            0x20
  26#define LTC3589_CLIRQ           0x21
  27#define LTC3589_B1DTV1          0x23
  28#define LTC3589_B1DTV2          0x24
  29#define LTC3589_VRRCR           0x25
  30#define LTC3589_B2DTV1          0x26
  31#define LTC3589_B2DTV2          0x27
  32#define LTC3589_B3DTV1          0x29
  33#define LTC3589_B3DTV2          0x2a
  34#define LTC3589_L2DTV1          0x32
  35#define LTC3589_L2DTV2          0x33
  36
  37#define LTC3589_IRQSTAT_PGOOD_TIMEOUT   BIT(3)
  38#define LTC3589_IRQSTAT_UNDERVOLT_WARN  BIT(4)
  39#define LTC3589_IRQSTAT_UNDERVOLT_FAULT BIT(5)
  40#define LTC3589_IRQSTAT_THERMAL_WARN    BIT(6)
  41#define LTC3589_IRQSTAT_THERMAL_FAULT   BIT(7)
  42
  43#define LTC3589_OVEN_SW1                BIT(0)
  44#define LTC3589_OVEN_SW2                BIT(1)
  45#define LTC3589_OVEN_SW3                BIT(2)
  46#define LTC3589_OVEN_BB_OUT             BIT(3)
  47#define LTC3589_OVEN_LDO2               BIT(4)
  48#define LTC3589_OVEN_LDO3               BIT(5)
  49#define LTC3589_OVEN_LDO4               BIT(6)
  50#define LTC3589_OVEN_SW_CTRL            BIT(7)
  51
  52#define LTC3589_VCCR_SW1_GO             BIT(0)
  53#define LTC3589_VCCR_SW2_GO             BIT(2)
  54#define LTC3589_VCCR_SW3_GO             BIT(4)
  55#define LTC3589_VCCR_LDO2_GO            BIT(6)
  56
  57enum ltc3589_variant {
  58        LTC3589,
  59        LTC3589_1,
  60        LTC3589_2,
  61};
  62
  63enum ltc3589_reg {
  64        LTC3589_SW1,
  65        LTC3589_SW2,
  66        LTC3589_SW3,
  67        LTC3589_BB_OUT,
  68        LTC3589_LDO1,
  69        LTC3589_LDO2,
  70        LTC3589_LDO3,
  71        LTC3589_LDO4,
  72        LTC3589_NUM_REGULATORS,
  73};
  74
  75struct ltc3589 {
  76        struct regmap *regmap;
  77        struct device *dev;
  78        enum ltc3589_variant variant;
  79        struct regulator_desc regulator_descs[LTC3589_NUM_REGULATORS];
  80        struct regulator_dev *regulators[LTC3589_NUM_REGULATORS];
  81};
  82
  83static const int ltc3589_ldo4[] = {
  84        2800000, 2500000, 1800000, 3300000,
  85};
  86
  87static const int ltc3589_12_ldo4[] = {
  88        1200000, 1800000, 2500000, 3200000,
  89};
  90
  91static int ltc3589_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  92{
  93        struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
  94        int sel, shift;
  95
  96        if (unlikely(ramp_delay <= 0))
  97                return -EINVAL;
  98
  99        /* VRRCR slew rate offsets are the same as VCCR go bit offsets */
 100        shift = ffs(rdev->desc->apply_bit) - 1;
 101
 102        /* The slew rate can be set to 0.88, 1.75, 3.5, or 7 mV/uS */
 103        for (sel = 0; sel < 4; sel++) {
 104                if ((880 << sel) >= ramp_delay) {
 105                        return regmap_update_bits(ltc3589->regmap,
 106                                                  LTC3589_VRRCR,
 107                                                  0x3 << shift, sel << shift);
 108                }
 109        }
 110        return -EINVAL;
 111}
 112
 113static int ltc3589_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 114{
 115        struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
 116        int sel;
 117
 118        sel = regulator_map_voltage_linear(rdev, uV, uV);
 119        if (sel < 0)
 120                return sel;
 121
 122        /* DTV2 register follows right after the corresponding DTV1 register */
 123        return regmap_update_bits(ltc3589->regmap, rdev->desc->vsel_reg + 1,
 124                                  rdev->desc->vsel_mask, sel);
 125}
 126
 127static int ltc3589_set_suspend_mode(struct regulator_dev *rdev,
 128                                    unsigned int mode)
 129{
 130        struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
 131        int mask, bit = 0;
 132
 133        /* VCCR reference selects are right next to the VCCR go bits */
 134        mask = rdev->desc->apply_bit << 1;
 135
 136        if (mode == REGULATOR_MODE_STANDBY)
 137                bit = mask;     /* Select DTV2 */
 138
 139        mask |= rdev->desc->apply_bit;
 140        bit |= rdev->desc->apply_bit;
 141        return regmap_update_bits(ltc3589->regmap, LTC3589_VCCR, mask, bit);
 142}
 143
 144/* SW1, SW2, SW3, LDO2 */
 145static const struct regulator_ops ltc3589_linear_regulator_ops = {
 146        .enable = regulator_enable_regmap,
 147        .disable = regulator_disable_regmap,
 148        .is_enabled = regulator_is_enabled_regmap,
 149        .list_voltage = regulator_list_voltage_linear,
 150        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 151        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 152        .set_ramp_delay = ltc3589_set_ramp_delay,
 153        .set_voltage_time_sel = regulator_set_voltage_time_sel,
 154        .set_suspend_voltage = ltc3589_set_suspend_voltage,
 155        .set_suspend_mode = ltc3589_set_suspend_mode,
 156};
 157
 158/* BB_OUT, LDO3 */
 159static const struct regulator_ops ltc3589_fixed_regulator_ops = {
 160        .enable = regulator_enable_regmap,
 161        .disable = regulator_disable_regmap,
 162        .is_enabled = regulator_is_enabled_regmap,
 163};
 164
 165/* LDO1 */
 166static const struct regulator_ops ltc3589_fixed_standby_regulator_ops = {
 167};
 168
 169/* LDO4 */
 170static const struct regulator_ops ltc3589_table_regulator_ops = {
 171        .enable = regulator_enable_regmap,
 172        .disable = regulator_disable_regmap,
 173        .is_enabled = regulator_is_enabled_regmap,
 174        .list_voltage = regulator_list_voltage_table,
 175        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 176        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 177};
 178
 179static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
 180{
 181        uint64_t tmp;
 182
 183        if (uV == 0)
 184                return 0;
 185
 186        tmp = (uint64_t)uV * r1;
 187        do_div(tmp, r2);
 188        return uV + (unsigned int)tmp;
 189}
 190
 191static int ltc3589_of_parse_cb(struct device_node *np,
 192                               const struct regulator_desc *desc,
 193                               struct regulator_config *config)
 194{
 195        struct ltc3589 *ltc3589 = config->driver_data;
 196        struct regulator_desc *rdesc = &ltc3589->regulator_descs[desc->id];
 197        u32 r[2];
 198        int ret;
 199
 200        /* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
 201        if (desc->id >= LTC3589_LDO3)
 202                return 0;
 203
 204        ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
 205        if (ret) {
 206                dev_err(ltc3589->dev, "Failed to parse voltage divider: %d\n",
 207                        ret);
 208                return ret;
 209        }
 210
 211        if (!r[0] || !r[1])
 212                return 0;
 213
 214        rdesc->min_uV = ltc3589_scale(desc->min_uV, r[0], r[1]);
 215        rdesc->uV_step = ltc3589_scale(desc->uV_step, r[0], r[1]);
 216        rdesc->fixed_uV = ltc3589_scale(desc->fixed_uV, r[0], r[1]);
 217
 218        return 0;
 219}
 220
 221#define LTC3589_REG(_name, _of_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit)\
 222        [LTC3589_ ## _name] = {                                         \
 223                .name = #_name,                                         \
 224                .of_match = of_match_ptr(#_of_name),                    \
 225                .regulators_node = of_match_ptr("regulators"),          \
 226                .of_parse_cb = ltc3589_of_parse_cb,                     \
 227                .n_voltages = (dtv_mask) + 1,                           \
 228                .min_uV = (go_bit) ? 362500 : 0,                        \
 229                .uV_step = (go_bit) ? 12500 : 0,                        \
 230                .ramp_delay = (go_bit) ? 1750 : 0,                      \
 231                .fixed_uV = (dtv_mask) ? 0 : 800000,                    \
 232                .ops = &ltc3589_ ## _ops ## _regulator_ops,             \
 233                .type = REGULATOR_VOLTAGE,                              \
 234                .id = LTC3589_ ## _name,                                \
 235                .owner = THIS_MODULE,                                   \
 236                .vsel_reg = (dtv1_reg),                                 \
 237                .vsel_mask = (dtv_mask),                                \
 238                .apply_reg = (go_bit) ? LTC3589_VCCR : 0,               \
 239                .apply_bit = (go_bit),                                  \
 240                .enable_reg = (en_bit) ? LTC3589_OVEN : 0,              \
 241                .enable_mask = (en_bit),                                \
 242        }
 243
 244#define LTC3589_LINEAR_REG(_name, _of_name, _dtv1)                      \
 245        LTC3589_REG(_name, _of_name, linear, LTC3589_OVEN_ ## _name,    \
 246                    LTC3589_ ## _dtv1, 0x1f,                            \
 247                    LTC3589_VCCR_ ## _name ## _GO)
 248
 249#define LTC3589_FIXED_REG(_name, _of_name)                              \
 250        LTC3589_REG(_name, _of_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)
 251
 252static const struct regulator_desc ltc3589_regulators[] = {
 253        LTC3589_LINEAR_REG(SW1, sw1, B1DTV1),
 254        LTC3589_LINEAR_REG(SW2, sw2, B2DTV1),
 255        LTC3589_LINEAR_REG(SW3, sw3, B3DTV1),
 256        LTC3589_FIXED_REG(BB_OUT, bb-out),
 257        LTC3589_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
 258        LTC3589_LINEAR_REG(LDO2, ldo2, L2DTV1),
 259        LTC3589_FIXED_REG(LDO3, ldo3),
 260        LTC3589_REG(LDO4, ldo4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2,
 261                    0x60, 0),
 262};
 263
 264static bool ltc3589_writeable_reg(struct device *dev, unsigned int reg)
 265{
 266        switch (reg) {
 267        case LTC3589_IRQSTAT:
 268        case LTC3589_SCR1:
 269        case LTC3589_OVEN:
 270        case LTC3589_SCR2:
 271        case LTC3589_VCCR:
 272        case LTC3589_CLIRQ:
 273        case LTC3589_B1DTV1:
 274        case LTC3589_B1DTV2:
 275        case LTC3589_VRRCR:
 276        case LTC3589_B2DTV1:
 277        case LTC3589_B2DTV2:
 278        case LTC3589_B3DTV1:
 279        case LTC3589_B3DTV2:
 280        case LTC3589_L2DTV1:
 281        case LTC3589_L2DTV2:
 282                return true;
 283        }
 284        return false;
 285}
 286
 287static bool ltc3589_readable_reg(struct device *dev, unsigned int reg)
 288{
 289        switch (reg) {
 290        case LTC3589_IRQSTAT:
 291        case LTC3589_SCR1:
 292        case LTC3589_OVEN:
 293        case LTC3589_SCR2:
 294        case LTC3589_PGSTAT:
 295        case LTC3589_VCCR:
 296        case LTC3589_B1DTV1:
 297        case LTC3589_B1DTV2:
 298        case LTC3589_VRRCR:
 299        case LTC3589_B2DTV1:
 300        case LTC3589_B2DTV2:
 301        case LTC3589_B3DTV1:
 302        case LTC3589_B3DTV2:
 303        case LTC3589_L2DTV1:
 304        case LTC3589_L2DTV2:
 305                return true;
 306        }
 307        return false;
 308}
 309
 310static bool ltc3589_volatile_reg(struct device *dev, unsigned int reg)
 311{
 312        switch (reg) {
 313        case LTC3589_IRQSTAT:
 314        case LTC3589_PGSTAT:
 315        case LTC3589_VCCR:
 316                return true;
 317        }
 318        return false;
 319}
 320
 321static const struct reg_default ltc3589_reg_defaults[] = {
 322        { LTC3589_SCR1,   0x00 },
 323        { LTC3589_OVEN,   0x00 },
 324        { LTC3589_SCR2,   0x00 },
 325        { LTC3589_VCCR,   0x00 },
 326        { LTC3589_B1DTV1, 0x19 },
 327        { LTC3589_B1DTV2, 0x19 },
 328        { LTC3589_VRRCR,  0xff },
 329        { LTC3589_B2DTV1, 0x19 },
 330        { LTC3589_B2DTV2, 0x19 },
 331        { LTC3589_B3DTV1, 0x19 },
 332        { LTC3589_B3DTV2, 0x19 },
 333        { LTC3589_L2DTV1, 0x19 },
 334        { LTC3589_L2DTV2, 0x19 },
 335};
 336
 337static const struct regmap_config ltc3589_regmap_config = {
 338        .reg_bits = 8,
 339        .val_bits = 8,
 340        .writeable_reg = ltc3589_writeable_reg,
 341        .readable_reg = ltc3589_readable_reg,
 342        .volatile_reg = ltc3589_volatile_reg,
 343        .max_register = LTC3589_L2DTV2,
 344        .reg_defaults = ltc3589_reg_defaults,
 345        .num_reg_defaults = ARRAY_SIZE(ltc3589_reg_defaults),
 346        .use_single_read = true,
 347        .use_single_write = true,
 348        .cache_type = REGCACHE_RBTREE,
 349};
 350
 351static irqreturn_t ltc3589_isr(int irq, void *dev_id)
 352{
 353        struct ltc3589 *ltc3589 = dev_id;
 354        unsigned int i, irqstat, event;
 355
 356        regmap_read(ltc3589->regmap, LTC3589_IRQSTAT, &irqstat);
 357
 358        if (irqstat & LTC3589_IRQSTAT_THERMAL_WARN) {
 359                event = REGULATOR_EVENT_OVER_TEMP;
 360                for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
 361                        regulator_notifier_call_chain(ltc3589->regulators[i],
 362                                                      event, NULL);
 363        }
 364
 365        if (irqstat & LTC3589_IRQSTAT_UNDERVOLT_WARN) {
 366                event = REGULATOR_EVENT_UNDER_VOLTAGE;
 367                for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
 368                        regulator_notifier_call_chain(ltc3589->regulators[i],
 369                                                      event, NULL);
 370        }
 371
 372        /* Clear warning condition */
 373        regmap_write(ltc3589->regmap, LTC3589_CLIRQ, 0);
 374
 375        return IRQ_HANDLED;
 376}
 377
 378static int ltc3589_probe(struct i2c_client *client,
 379                         const struct i2c_device_id *id)
 380{
 381        struct device *dev = &client->dev;
 382        struct regulator_desc *descs;
 383        struct ltc3589 *ltc3589;
 384        int i, ret;
 385
 386        ltc3589 = devm_kzalloc(dev, sizeof(*ltc3589), GFP_KERNEL);
 387        if (!ltc3589)
 388                return -ENOMEM;
 389
 390        i2c_set_clientdata(client, ltc3589);
 391        if (client->dev.of_node)
 392                ltc3589->variant = (enum ltc3589_variant)
 393                        of_device_get_match_data(&client->dev);
 394        else
 395                ltc3589->variant = id->driver_data;
 396        ltc3589->dev = dev;
 397
 398        descs = ltc3589->regulator_descs;
 399        memcpy(descs, ltc3589_regulators, sizeof(ltc3589_regulators));
 400        if (ltc3589->variant == LTC3589) {
 401                descs[LTC3589_LDO3].fixed_uV = 1800000;
 402                descs[LTC3589_LDO4].volt_table = ltc3589_ldo4;
 403        } else {
 404                descs[LTC3589_LDO3].fixed_uV = 2800000;
 405                descs[LTC3589_LDO4].volt_table = ltc3589_12_ldo4;
 406        }
 407
 408        ltc3589->regmap = devm_regmap_init_i2c(client, &ltc3589_regmap_config);
 409        if (IS_ERR(ltc3589->regmap)) {
 410                ret = PTR_ERR(ltc3589->regmap);
 411                dev_err(dev, "failed to initialize regmap: %d\n", ret);
 412                return ret;
 413        }
 414
 415        for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
 416                struct regulator_desc *desc = &ltc3589->regulator_descs[i];
 417                struct regulator_config config = { };
 418
 419                config.dev = dev;
 420                config.driver_data = ltc3589;
 421
 422                ltc3589->regulators[i] = devm_regulator_register(dev, desc,
 423                                                                 &config);
 424                if (IS_ERR(ltc3589->regulators[i])) {
 425                        ret = PTR_ERR(ltc3589->regulators[i]);
 426                        dev_err(dev, "failed to register regulator %s: %d\n",
 427                                desc->name, ret);
 428                        return ret;
 429                }
 430        }
 431
 432        if (client->irq) {
 433                ret = devm_request_threaded_irq(dev, client->irq, NULL,
 434                                                ltc3589_isr,
 435                                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 436                                                client->name, ltc3589);
 437                if (ret) {
 438                        dev_err(dev, "Failed to request IRQ: %d\n", ret);
 439                        return ret;
 440                }
 441        }
 442
 443        return 0;
 444}
 445
 446static const struct i2c_device_id ltc3589_i2c_id[] = {
 447        { "ltc3589",   LTC3589   },
 448        { "ltc3589-1", LTC3589_1 },
 449        { "ltc3589-2", LTC3589_2 },
 450        { }
 451};
 452MODULE_DEVICE_TABLE(i2c, ltc3589_i2c_id);
 453
 454static const struct of_device_id __maybe_unused ltc3589_of_match[] = {
 455        {
 456                .compatible = "lltc,ltc3589",
 457                .data = (void *)LTC3589,
 458        },
 459        {
 460                .compatible = "lltc,ltc3589-1",
 461                .data = (void *)LTC3589_1,
 462        },
 463        {
 464                .compatible = "lltc,ltc3589-2",
 465                .data = (void *)LTC3589_2,
 466        },
 467        { },
 468};
 469MODULE_DEVICE_TABLE(of, ltc3589_of_match);
 470
 471static struct i2c_driver ltc3589_driver = {
 472        .driver = {
 473                .name = DRIVER_NAME,
 474                .of_match_table = of_match_ptr(ltc3589_of_match),
 475        },
 476        .probe = ltc3589_probe,
 477        .id_table = ltc3589_i2c_id,
 478};
 479module_i2c_driver(ltc3589_driver);
 480
 481MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
 482MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3589(-1,2)");
 483MODULE_LICENSE("GPL v2");
 484