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