drivers/regulator/lp8752.c

   1 /*
   2  * LP8752 High Performance Power Management Unit : System Interface Driver
   3  *
   4  * Author: zhangqing <zhangqing@rock-chips.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/i2c.h>
  15 #include <linux/err.h>
  16 #include <linux/irq.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/gpio.h>
  19 #include <linux/regmap.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/of_regulator.h>
  23 #include <linux/regulator/machine.h>
  24
  25 #define LP8752_CTRL_BUCK0               0x02
  26 #define LP8752_CTRL_BUCK1               0x04
  27 #define LP8752_CTRL_BUCK2               0x06
  28 #define LP8752_CTRL_BUCK3               0x08
  29
  30 #define LP8752_VOUT_BUCK0               0x0a
  31 #define LP8752_VOUT_BUCK1               0x0c
  32 #define LP8752_VOUT_BUCK2               0x0e
  33 #define LP8752_VOUT_BUCK3               0x10
  34
  35 #define LP8752_BUCK_VSEL_MASK           0xff
  36 #define LP8752_REG_MAX                  0x2f
  37
  38 enum lp8752_bucks {
  39         LP8752_BUCK0 = 0,
  40         LP8752_BUCK1,
  41         LP8752_BUCK2,
  42         LP8752_BUCK3,
  43         LP8752_BUCK_MAX,
  44 };
  45
  46 static const struct regulator_linear_range lp8752_buck_voltage_ranges[] = {
  47         REGULATOR_LINEAR_RANGE(500000, 0, 23, 10000),
  48         REGULATOR_LINEAR_RANGE(735000, 24, 157, 5000),
  49         REGULATOR_LINEAR_RANGE(1420000, 158, 255, 20000),
  50 };
  51
  52 struct lp8752_platform_data {
  53         int nphase;
  54         struct device_node *of_node[LP8752_BUCK_MAX];
  55         struct regulator_desc desc;
  56         struct regulator_init_data *buck_data[LP8752_BUCK_MAX];
  57 };
  58
  59 struct lp8752_mphase {
  60         int nreg;
  61         int buck_id[LP8752_BUCK_MAX];
  62 };
  63
  64 struct lp8752_chip {
  65         int nphase;
  66         struct device *dev;
  67         struct regmap *regmap;
  68         struct lp8752_platform_data *pdata;
  69         struct regulator_dev *rdev[LP8752_BUCK_MAX];
  70 };
  71
  72 static int lp8752_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
  73 {
  74         struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
  75         u8 msk = BIT(1);
  76         int ret;
  77
  78         switch (mode) {
  79         case REGULATOR_MODE_FAST:
  80                 /* forced pwm mode */
  81                 ret = regmap_update_bits(pchip->regmap,
  82                                          rdev->desc->enable_reg,
  83                                          msk, 0x1);
  84         case REGULATOR_MODE_NORMAL:
  85                 /* automatic pwm/pfm mode */
  86                 ret = regmap_update_bits(pchip->regmap,
  87                                          rdev->desc->enable_reg,
  88                                          msk, 0x0);
  89         default:
  90                 break;
  91         }
  92
  93         return ret;
  94 }
  95
  96 static unsigned int lp8752_buck_get_mode(struct regulator_dev *rdev)
  97 {
  98         struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
  99         int ret;
 100         unsigned int reg;
 101
 102         ret = regmap_read(pchip->regmap, rdev->desc->enable_reg, &reg);
 103         if (ret < 0) {
 104                 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 105                 return ret;
 106         }
 107
 108         return (reg & BIT(1)) ?  REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
 109 }
 110
 111 static struct regulator_ops lp8752_buck_ops = {
 112         .map_voltage = regulator_map_voltage_linear_range,
 113         .list_voltage = regulator_list_voltage_linear_range,
 114         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 115         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 116         .enable = regulator_enable_regmap,
 117         .disable = regulator_disable_regmap,
 118         .is_enabled = regulator_is_enabled_regmap,
 119         .set_mode = lp8752_buck_set_mode,
 120         .get_mode = lp8752_buck_get_mode,
 121 };
 122
 123 #define lp8752_rail(_id) "lp8752_buck"#_id
 124 #define vin(_id) "vin"#_id
 125
 126 static const struct lp8752_mphase mphase_buck[] = {
 127         { 1, { LP8752_BUCK0} },
 128         { 2, { LP8752_BUCK0, LP8752_BUCK3 } },
 129         { 3, { LP8752_BUCK0, LP8752_BUCK2, LP8752_BUCK3 } },
 130         { 4, { LP8752_BUCK0, LP8752_BUCK1, LP8752_BUCK2, LP8752_BUCK3 } },
 131 };
 132
 133 static struct of_regulator_match lp8752_reg_matches[] = {
 134         { .name = "lp8752_buck0", .driver_data = (void *)0 },
 135         { .name = "lp8752_buck1", .driver_data = (void *)1 },
 136         { .name = "lp8752_buck2", .driver_data = (void *)2 },
 137         { .name = "lp8752_buck3", .driver_data = (void *)3 },
 138 };
 139
 140 static int lp8752_init_data(struct lp8752_chip *pchip)
 141 {
 142         int icnt, buck_id, count;
 143         struct lp8752_platform_data *pdata = pchip->pdata;
 144         struct device_node *regs, *lp8752_np;
 145
 146         lp8752_np = of_node_get(pchip->dev->of_node);
 147         if (!lp8752_np) {
 148                 dev_err(pchip->dev, "Failed to find device node\n");
 149                 return -ENODEV;
 150         }
 151
 152         regs = of_find_node_by_name(lp8752_np, "regulators");
 153         if (!regs)
 154                 return -ENODEV;
 155
 156         count = of_regulator_match(pchip->dev, regs, lp8752_reg_matches,
 157                                    LP8752_BUCK_MAX);
 158         of_node_put(regs);
 159         if ((count <= 0) || (count > LP8752_BUCK_MAX))
 160                 return -ENODEV;
 161
 162         pchip->nphase = (count - 1) & 0xf;
 163
 164         /* set default data based on multi-phase config */
 165         for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
 166                 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
 167                 pdata->buck_data[buck_id] =
 168                 lp8752_reg_matches[buck_id].init_data;
 169                 pdata->of_node[buck_id] = lp8752_reg_matches[buck_id].of_node;
 170         }
 171
 172         return 0;
 173 }
 174
 175 #define lp8752_buck_desc(_id)\
 176 {\
 177         .name = lp8752_rail(_id),\
 178         .id   = LP8752_BUCK##_id,\
 179         .supply_name = vin(_id),\
 180         .ops  = &lp8752_buck_ops,\
 181         .n_voltages = LP8752_BUCK_VSEL_MASK + 1,\
 182         .linear_ranges = lp8752_buck_voltage_ranges,\
 183         .n_linear_ranges = ARRAY_SIZE(lp8752_buck_voltage_ranges),\
 184         .type = REGULATOR_VOLTAGE,\
 185         .enable_reg = LP8752_CTRL_BUCK##_id,\
 186         .enable_mask = BIT(7),\
 187         .vsel_reg = LP8752_VOUT_BUCK##_id,\
 188         .vsel_mask = LP8752_BUCK_VSEL_MASK,\
 189         .enable_time = 400,\
 190         .owner = THIS_MODULE,\
 191 }
 192
 193 static struct regulator_desc lp8752_reg_desc[] = {
 194         lp8752_buck_desc(0),
 195         lp8752_buck_desc(1),
 196         lp8752_buck_desc(2),
 197         lp8752_buck_desc(3),
 198 };
 199
 200 static int lp8752_regulator_init(struct lp8752_chip *pchip)
 201 {
 202         int ret, icnt, buck_id;
 203         struct lp8752_platform_data *pdata = pchip->pdata;
 204         struct regulator_config rconfig = { };
 205
 206         rconfig.regmap = pchip->regmap;
 207         rconfig.dev = pchip->dev;
 208         rconfig.driver_data = pchip;
 209
 210         for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
 211                 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
 212                 rconfig.init_data = pdata->buck_data[buck_id];
 213                 rconfig.of_node = pdata->of_node[buck_id];
 214                 pchip->rdev[buck_id] =
 215                 devm_regulator_register(pchip->dev,
 216                                         &lp8752_reg_desc[buck_id],
 217                                         &rconfig);
 218                 if (IS_ERR(pchip->rdev[buck_id])) {
 219                         ret = PTR_ERR(pchip->rdev[buck_id]);
 220                         pchip->rdev[buck_id] = NULL;
 221                         dev_err(pchip->dev, "regulator init failed: buck %d\n",
 222                                 buck_id);
 223                         return ret;
 224                 }
 225         }
 226
 227         return 0;
 228 }
 229
 230 static const struct regmap_config lp8752_regmap = {
 231         .reg_bits = 8,
 232         .val_bits = 8,
 233         .max_register = LP8752_REG_MAX,
 234 };
 235
 236 static int lp8752_probe(struct i2c_client *client,
 237                         const struct i2c_device_id *id)
 238 {
 239         int ret;
 240         struct lp8752_chip *pchip;
 241         struct lp8752_platform_data *pdata = dev_get_platdata(&client->dev);
 242
 243         pchip = devm_kzalloc(&client->dev,
 244                              sizeof(struct lp8752_chip), GFP_KERNEL);
 245         if (!pchip)
 246                 return -ENOMEM;
 247
 248         pchip->dev = &client->dev;
 249         pchip->regmap = devm_regmap_init_i2c(client, &lp8752_regmap);
 250         if (IS_ERR(pchip->regmap)) {
 251                 ret = PTR_ERR(pchip->regmap);
 252                 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
 253                 return ret;
 254         }
 255         i2c_set_clientdata(client, pchip);
 256
 257         ret = regmap_update_bits(pchip->regmap,
 258                                  LP8752_CTRL_BUCK0,
 259                                  (1 << 0), 0x1);
 260         ret = regmap_update_bits(pchip->regmap,
 261                                  LP8752_CTRL_BUCK2,
 262                                  (1 << 0), 0x1);
 263
 264         if (!pdata) {
 265                 pchip->pdata = devm_kzalloc(pchip->dev,
 266                                             sizeof(struct lp8752_platform_data),
 267                                             GFP_KERNEL);
 268                 if (!pchip->pdata)
 269                         return -ENOMEM;
 270
 271                 ret = lp8752_init_data(pchip);
 272                 if (ret < 0) {
 273                         dev_err(&client->dev, "fail to initialize chip\n");
 274                         return ret;
 275                 }
 276         } else {
 277                 pchip->pdata = pdata;
 278                 pchip->nphase = pdata->nphase;
 279         }
 280
 281         lp8752_regulator_init(pchip);
 282
 283         return 0;
 284 }
 285
 286 static const struct of_device_id lp8752_of_match[] = {
 287         { .compatible = "ti,lp8752", },
 288         {},
 289 };
 290 MODULE_DEVICE_TABLE(of, lp8752_of_match);
 291
 292 static const struct i2c_device_id lp8752_id[] = {
 293         {"lp8752", 0},
 294         {}
 295 };
 296 MODULE_DEVICE_TABLE(i2c, lp8752_id);
 297
 298 static struct i2c_driver lp8752_i2c_driver = {
 299         .probe = lp8752_probe,
 300         .id_table = lp8752_id,
 301         .driver = {
 302                 .name = "lp8752",
 303                 .of_match_table = of_match_ptr(lp8752_of_match),
 304         },
 305 };
 306
 307 module_i2c_driver(lp8752_i2c_driver);
 308
 309 MODULE_DESCRIPTION("Texas Instruments lp8752 driver");
 310 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
 311 MODULE_LICENSE("GPL v2");