drivers/mfd/tps65218.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for TPS65218 Integrated power management chipsets
   4  *
   5  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/device.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/init.h>
  13 #include <linux/i2c.h>
  14 #include <linux/slab.h>
  15 #include <linux/regmap.h>
  16 #include <linux/err.h>
  17 #include <linux/of.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mutex.h>
  21
  22 #include <linux/mfd/core.h>
  23 #include <linux/mfd/tps65218.h>
  24
  25 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
  26
  27 static const struct mfd_cell tps65218_cells[] = {
  28         {
  29                 .name = "tps65218-pwrbutton",
  30                 .of_compatible = "ti,tps65218-pwrbutton",
  31         },
  32         {
  33                 .name = "tps65218-gpio",
  34                 .of_compatible = "ti,tps65218-gpio",
  35         },
  36         { .name = "tps65218-regulator", },
  37 };
  38
  39 /**
  40  * tps65218_reg_write: Write a single tps65218 register.
  41  *
  42  * @tps: Device to write to.
  43  * @reg: Register to write to.
  44  * @val: Value to write.
  45  * @level: Password protected level
  46  */
  47 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
  48                         unsigned int val, unsigned int level)
  49 {
  50         int ret;
  51         unsigned int xor_reg_val;
  52
  53         switch (level) {
  54         case TPS65218_PROTECT_NONE:
  55                 return regmap_write(tps->regmap, reg, val);
  56         case TPS65218_PROTECT_L1:
  57                 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
  58                 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
  59                                                         xor_reg_val);
  60                 if (ret < 0)
  61                         return ret;
  62
  63                 return regmap_write(tps->regmap, reg, val);
  64         default:
  65                 return -EINVAL;
  66         }
  67 }
  68 EXPORT_SYMBOL_GPL(tps65218_reg_write);
  69
  70 /**
  71  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
  72  *
  73  * @tps: Device to write to.
  74  * @reg: Register to read-write to.
  75  * @mask: Mask.
  76  * @val: Value to write.
  77  * @level: Password protected level
  78  */
  79 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
  80                 unsigned int mask, unsigned int val, unsigned int level)
  81 {
  82         int ret;
  83         unsigned int data;
  84
  85         ret = regmap_read(tps->regmap, reg, &data);
  86         if (ret) {
  87                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
  88                 return ret;
  89         }
  90
  91         data &= ~mask;
  92         data |= val & mask;
  93
  94         mutex_lock(&tps->tps_lock);
  95         ret = tps65218_reg_write(tps, reg, data, level);
  96         if (ret)
  97                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
  98         mutex_unlock(&tps->tps_lock);
  99
 100         return ret;
 101 }
 102
 103 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
 104                 unsigned int mask, unsigned int val, unsigned int level)
 105 {
 106         return tps65218_update_bits(tps, reg, mask, val, level);
 107 }
 108 EXPORT_SYMBOL_GPL(tps65218_set_bits);
 109
 110 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
 111                 unsigned int mask, unsigned int level)
 112 {
 113         return tps65218_update_bits(tps, reg, mask, 0, level);
 114 }
 115 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
 116
 117 static const struct regmap_range tps65218_yes_ranges[] = {
 118         regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
 119         regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
 120 };
 121
 122 static const struct regmap_access_table tps65218_volatile_table = {
 123         .yes_ranges = tps65218_yes_ranges,
 124         .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
 125 };
 126
 127 static const struct regmap_config tps65218_regmap_config = {
 128         .reg_bits = 8,
 129         .val_bits = 8,
 130         .cache_type = REGCACHE_RBTREE,
 131         .volatile_table = &tps65218_volatile_table,
 132 };
 133
 134 static const struct regmap_irq tps65218_irqs[] = {
 135         /* INT1 IRQs */
 136         [TPS65218_PRGC_IRQ] = {
 137                 .mask = TPS65218_INT1_PRGC,
 138         },
 139         [TPS65218_CC_AQC_IRQ] = {
 140                 .mask = TPS65218_INT1_CC_AQC,
 141         },
 142         [TPS65218_HOT_IRQ] = {
 143                 .mask = TPS65218_INT1_HOT,
 144         },
 145         [TPS65218_PB_IRQ] = {
 146                 .mask = TPS65218_INT1_PB,
 147         },
 148         [TPS65218_AC_IRQ] = {
 149                 .mask = TPS65218_INT1_AC,
 150         },
 151         [TPS65218_VPRG_IRQ] = {
 152                 .mask = TPS65218_INT1_VPRG,
 153         },
 154         [TPS65218_INVALID1_IRQ] = {
 155         },
 156         [TPS65218_INVALID2_IRQ] = {
 157         },
 158         /* INT2 IRQs*/
 159         [TPS65218_LS1_I_IRQ] = {
 160                 .mask = TPS65218_INT2_LS1_I,
 161                 .reg_offset = 1,
 162         },
 163         [TPS65218_LS2_I_IRQ] = {
 164                 .mask = TPS65218_INT2_LS2_I,
 165                 .reg_offset = 1,
 166         },
 167         [TPS65218_LS3_I_IRQ] = {
 168                 .mask = TPS65218_INT2_LS3_I,
 169                 .reg_offset = 1,
 170         },
 171         [TPS65218_LS1_F_IRQ] = {
 172                 .mask = TPS65218_INT2_LS1_F,
 173                 .reg_offset = 1,
 174         },
 175         [TPS65218_LS2_F_IRQ] = {
 176                 .mask = TPS65218_INT2_LS2_F,
 177                 .reg_offset = 1,
 178         },
 179         [TPS65218_LS3_F_IRQ] = {
 180                 .mask = TPS65218_INT2_LS3_F,
 181                 .reg_offset = 1,
 182         },
 183         [TPS65218_INVALID3_IRQ] = {
 184         },
 185         [TPS65218_INVALID4_IRQ] = {
 186         },
 187 };
 188
 189 static struct regmap_irq_chip tps65218_irq_chip = {
 190         .name = "tps65218",
 191         .irqs = tps65218_irqs,
 192         .num_irqs = ARRAY_SIZE(tps65218_irqs),
 193
 194         .num_regs = 2,
 195         .mask_base = TPS65218_REG_INT_MASK1,
 196         .status_base = TPS65218_REG_INT1,
 197 };
 198
 199 static const struct of_device_id of_tps65218_match_table[] = {
 200         { .compatible = "ti,tps65218", },
 201         {}
 202 };
 203 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
 204
 205 static int tps65218_voltage_set_strict(struct tps65218 *tps)
 206 {
 207         u32 strict;
 208
 209         if (of_property_read_u32(tps->dev->of_node,
 210                                  "ti,strict-supply-voltage-supervision",
 211                                  &strict))
 212                 return 0;
 213
 214         if (strict != 0 && strict != 1) {
 215                 dev_err(tps->dev,
 216                         "Invalid ti,strict-supply-voltage-supervision value\n");
 217                 return -EINVAL;
 218         }
 219
 220         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
 221                              TPS65218_CONFIG1_STRICT,
 222                              strict ? TPS65218_CONFIG1_STRICT : 0,
 223                              TPS65218_PROTECT_L1);
 224         return 0;
 225 }
 226
 227 static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
 228 {
 229         u32 hyst;
 230
 231         if (of_property_read_u32(tps->dev->of_node,
 232                                  "ti,under-voltage-hyst-microvolt", &hyst))
 233                 return 0;
 234
 235         if (hyst != 400000 && hyst != 200000) {
 236                 dev_err(tps->dev,
 237                         "Invalid ti,under-voltage-hyst-microvolt value\n");
 238                 return -EINVAL;
 239         }
 240
 241         tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
 242                              TPS65218_CONFIG2_UVLOHYS,
 243                              hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
 244                              TPS65218_PROTECT_L1);
 245         return 0;
 246 }
 247
 248 static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
 249 {
 250         u32 uvlo;
 251         int uvloval;
 252
 253         if (of_property_read_u32(tps->dev->of_node,
 254                                  "ti,under-voltage-limit-microvolt", &uvlo))
 255                 return 0;
 256
 257         switch (uvlo) {
 258         case 2750000:
 259                 uvloval = TPS65218_CONFIG1_UVLO_2750000;
 260                 break;
 261         case 2950000:
 262                 uvloval = TPS65218_CONFIG1_UVLO_2950000;
 263                 break;
 264         case 3250000:
 265                 uvloval = TPS65218_CONFIG1_UVLO_3250000;
 266                 break;
 267         case 3350000:
 268                 uvloval = TPS65218_CONFIG1_UVLO_3350000;
 269                 break;
 270         default:
 271                 dev_err(tps->dev,
 272                         "Invalid ti,under-voltage-limit-microvolt value\n");
 273                 return -EINVAL;
 274         }
 275
 276         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
 277                              TPS65218_CONFIG1_UVLO_MASK, uvloval,
 278                              TPS65218_PROTECT_L1);
 279         return 0;
 280 }
 281
 282 static int tps65218_probe(struct i2c_client *client)
 283 {
 284         struct tps65218 *tps;
 285         int ret;
 286         unsigned int chipid;
 287
 288         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 289         if (!tps)
 290                 return -ENOMEM;
 291
 292         i2c_set_clientdata(client, tps);
 293         tps->dev = &client->dev;
 294         tps->irq = client->irq;
 295         tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
 296         if (IS_ERR(tps->regmap)) {
 297                 ret = PTR_ERR(tps->regmap);
 298                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
 299                         ret);
 300                 return ret;
 301         }
 302
 303         mutex_init(&tps->tps_lock);
 304
 305         ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
 306                                        IRQF_ONESHOT, 0, &tps65218_irq_chip,
 307                                        &tps->irq_data);
 308         if (ret < 0)
 309                 return ret;
 310
 311         ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
 312         if (ret) {
 313                 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
 314                 return ret;
 315         }
 316
 317         tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
 318
 319         ret = tps65218_voltage_set_strict(tps);
 320         if (ret)
 321                 return ret;
 322
 323         ret = tps65218_voltage_set_uvlo(tps);
 324         if (ret)
 325                 return ret;
 326
 327         ret = tps65218_voltage_set_uv_hyst(tps);
 328         if (ret)
 329                 return ret;
 330
 331         ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
 332                               ARRAY_SIZE(tps65218_cells), NULL, 0,
 333                               regmap_irq_get_domain(tps->irq_data));
 334
 335         return ret;
 336 }
 337
 338 static const struct i2c_device_id tps65218_id_table[] = {
 339         { "tps65218", TPS65218 },
 340         { },
 341 };
 342 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
 343
 344 static struct i2c_driver tps65218_driver = {
 345         .driver         = {
 346                 .name   = "tps65218",
 347                 .of_match_table = of_tps65218_match_table,
 348         },
 349         .probe          = tps65218_probe,
 350         .id_table       = tps65218_id_table,
 351 };
 352
 353 module_i2c_driver(tps65218_driver);
 354
 355 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 356 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
 357 MODULE_LICENSE("GPL v2");