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                 break;
  85         case REGULATOR_MODE_NORMAL:
  86                 /* automatic pwm/pfm mode */
  87                 ret = regmap_update_bits(pchip->regmap,
  88                                          rdev->desc->enable_reg,
  89                                          msk, 0x0);
  90                 break;
  91         default:
  92                 dev_err(pchip->dev, "error:lp8752 only support auto and pwm mode\n");
  93                 ret = -EINVAL;
  94                 break;
  95         }
  96
  97         return ret;
  98 }
  99
 100 static unsigned int lp8752_buck_get_mode(struct regulator_dev *rdev)
 101 {
 102         struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
 103         int ret;
 104         unsigned int reg;
 105
 106         ret = regmap_read(pchip->regmap, rdev->desc->enable_reg, &reg);
 107         if (ret < 0) {
 108                 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 109                 return ret;
 110         }
 111
 112         return (reg & BIT(1)) ?  REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
 113 }
 114
 115 static struct regulator_ops lp8752_buck_ops = {
 116         .map_voltage = regulator_map_voltage_linear_range,
 117         .list_voltage = regulator_list_voltage_linear_range,
 118         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 119         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 120         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 121         .enable = regulator_enable_regmap,
 122         .disable = regulator_disable_regmap,
 123         .is_enabled = regulator_is_enabled_regmap,
 124         .set_mode = lp8752_buck_set_mode,
 125         .get_mode = lp8752_buck_get_mode,
 126 };
 127
 128 #define lp8752_rail(_id) "lp8752_buck"#_id
 129 #define vin(_id) "vin"#_id
 130
 131 static const struct lp8752_mphase mphase_buck[] = {
 132         { 1, { LP8752_BUCK0} },
 133         { 2, { LP8752_BUCK0, LP8752_BUCK3 } },
 134         { 3, { LP8752_BUCK0, LP8752_BUCK2, LP8752_BUCK3 } },
 135         { 4, { LP8752_BUCK0, LP8752_BUCK1, LP8752_BUCK2, LP8752_BUCK3 } },
 136 };
 137
 138 static struct of_regulator_match lp8752_reg_matches[] = {
 139         { .name = "lp8752_buck0", .driver_data = (void *)0 },
 140         { .name = "lp8752_buck1", .driver_data = (void *)1 },
 141         { .name = "lp8752_buck2", .driver_data = (void *)2 },
 142         { .name = "lp8752_buck3", .driver_data = (void *)3 },
 143 };
 144
 145 static int lp8752_init_data(struct lp8752_chip *pchip)
 146 {
 147         int icnt, buck_id, count;
 148         struct lp8752_platform_data *pdata = pchip->pdata;
 149         struct device_node *regs, *lp8752_np;
 150
 151         lp8752_np = of_node_get(pchip->dev->of_node);
 152         if (!lp8752_np) {
 153                 dev_err(pchip->dev, "Failed to find device node\n");
 154                 return -ENODEV;
 155         }
 156
 157         regs = of_find_node_by_name(lp8752_np, "regulators");
 158         if (!regs)
 159                 return -ENODEV;
 160
 161         count = of_regulator_match(pchip->dev, regs, lp8752_reg_matches,
 162                                    LP8752_BUCK_MAX);
 163         of_node_put(regs);
 164         if ((count <= 0) || (count > LP8752_BUCK_MAX))
 165                 return -ENODEV;
 166
 167         pchip->nphase = (count - 1) & 0xf;
 168
 169         /* set default data based on multi-phase config */
 170         for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
 171                 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
 172                 pdata->buck_data[buck_id] =
 173                 lp8752_reg_matches[buck_id].init_data;
 174                 pdata->of_node[buck_id] = lp8752_reg_matches[buck_id].of_node;
 175         }
 176
 177         return 0;
 178 }
 179
 180 #define lp8752_buck_desc(_id)\
 181 {\
 182         .name = lp8752_rail(_id),\
 183         .id   = LP8752_BUCK##_id,\
 184         .supply_name = vin(_id),\
 185         .ops  = &lp8752_buck_ops,\
 186         .n_voltages = LP8752_BUCK_VSEL_MASK + 1,\
 187         .linear_ranges = lp8752_buck_voltage_ranges,\
 188         .n_linear_ranges = ARRAY_SIZE(lp8752_buck_voltage_ranges),\
 189         .type = REGULATOR_VOLTAGE,\
 190         .enable_reg = LP8752_CTRL_BUCK##_id,\
 191         .enable_mask = BIT(7),\
 192         .vsel_reg = LP8752_VOUT_BUCK##_id,\
 193         .vsel_mask = LP8752_BUCK_VSEL_MASK,\
 194         .enable_time = 400,\
 195         .owner = THIS_MODULE,\
 196 }
 197
 198 static struct regulator_desc lp8752_reg_desc[] = {
 199         lp8752_buck_desc(0),
 200         lp8752_buck_desc(1),
 201         lp8752_buck_desc(2),
 202         lp8752_buck_desc(3),
 203 };
 204
 205 static int lp8752_regulator_init(struct lp8752_chip *pchip)
 206 {
 207         int ret, icnt, buck_id;
 208         struct lp8752_platform_data *pdata = pchip->pdata;
 209         struct regulator_config rconfig = { };
 210
 211         rconfig.regmap = pchip->regmap;
 212         rconfig.dev = pchip->dev;
 213         rconfig.driver_data = pchip;
 214
 215         for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
 216                 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
 217                 rconfig.init_data = pdata->buck_data[buck_id];
 218                 rconfig.of_node = pdata->of_node[buck_id];
 219                 pchip->rdev[buck_id] =
 220                 devm_regulator_register(pchip->dev,
 221                                         &lp8752_reg_desc[buck_id],
 222                                         &rconfig);
 223                 if (IS_ERR(pchip->rdev[buck_id])) {
 224                         ret = PTR_ERR(pchip->rdev[buck_id]);
 225                         pchip->rdev[buck_id] = NULL;
 226                         dev_err(pchip->dev, "regulator init failed: buck %d\n",
 227                                 buck_id);
 228                         return ret;
 229                 }
 230         }
 231
 232         return 0;
 233 }
 234
 235 static const struct regmap_config lp8752_regmap = {
 236         .reg_bits = 8,
 237         .val_bits = 8,
 238         .max_register = LP8752_REG_MAX,
 239 };
 240
 241 static int lp8752_probe(struct i2c_client *client,
 242                         const struct i2c_device_id *id)
 243 {
 244         int ret;
 245         struct lp8752_chip *pchip;
 246         struct lp8752_platform_data *pdata = dev_get_platdata(&client->dev);
 247
 248         pchip = devm_kzalloc(&client->dev,
 249                              sizeof(struct lp8752_chip), GFP_KERNEL);
 250         if (!pchip)
 251                 return -ENOMEM;
 252
 253         pchip->dev = &client->dev;
 254         pchip->regmap = devm_regmap_init_i2c(client, &lp8752_regmap);
 255         if (IS_ERR(pchip->regmap)) {
 256                 ret = PTR_ERR(pchip->regmap);
 257                 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
 258                 return ret;
 259         }
 260         i2c_set_clientdata(client, pchip);
 261
 262         ret = regmap_update_bits(pchip->regmap,
 263                                  LP8752_CTRL_BUCK0,
 264                                  (1 << 0), 0);
 265         ret = regmap_update_bits(pchip->regmap,
 266                                  LP8752_CTRL_BUCK2,
 267                                  (1 << 0), 0);
 268
 269         if (!pdata) {
 270                 pchip->pdata = devm_kzalloc(pchip->dev,
 271                                             sizeof(struct lp8752_platform_data),
 272                                             GFP_KERNEL);
 273                 if (!pchip->pdata)
 274                         return -ENOMEM;
 275
 276                 ret = lp8752_init_data(pchip);
 277                 if (ret < 0) {
 278                         dev_err(&client->dev, "fail to initialize chip\n");
 279                         return ret;
 280                 }
 281         } else {
 282                 pchip->pdata = pdata;
 283                 pchip->nphase = pdata->nphase;
 284         }
 285
 286         lp8752_regulator_init(pchip);
 287
 288         return 0;
 289 }
 290
 291 static const struct of_device_id lp8752_of_match[] = {
 292         { .compatible = "ti,lp8752", },
 293         {},
 294 };
 295 MODULE_DEVICE_TABLE(of, lp8752_of_match);
 296
 297 static const struct i2c_device_id lp8752_id[] = {
 298         {"lp8752", 0},
 299         {}
 300 };
 301 MODULE_DEVICE_TABLE(i2c, lp8752_id);
 302
 303 static struct i2c_driver lp8752_i2c_driver = {
 304         .probe = lp8752_probe,
 305         .id_table = lp8752_id,
 306         .driver = {
 307                 .name = "lp8752",
 308                 .of_match_table = of_match_ptr(lp8752_of_match),
 309         },
 310 };
 311
 312 module_i2c_driver(lp8752_i2c_driver);
 313
 314 MODULE_DESCRIPTION("Texas Instruments lp8752 driver");
 315 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
 316 MODULE_LICENSE("GPL v2");