kernel/drivers/mfd/tps65217.c

   1 /*
   2  * tps65217.c
   3  *
   4  * TPS65217 chip family multi-function driver
   5  *
   6  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation version 2.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/device.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/init.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25 #include <linux/regmap.h>
  26 #include <linux/err.h>
  27 #include <linux/of.h>
  28 #include <linux/of_device.h>
  29
  30 #include <linux/mfd/core.h>
  31 #include <linux/mfd/tps65217.h>
  32
  33 static const struct mfd_cell tps65217s[] = {
  34         {
  35                 .name = "tps65217-pmic",
  36                 .of_compatible = "ti,tps65217-pmic",
  37         },
  38         {
  39                 .name = "tps65217-bl",
  40                 .of_compatible = "ti,tps65217-bl",
  41         },
  42         {
  43                 .name = "tps65217-charger",
  44                 .of_compatible = "ti,tps65217-charger",
  45         },
  46 };
  47
  48 /**
  49  * tps65217_reg_read: Read a single tps65217 register.
  50  *
  51  * @tps: Device to read from.
  52  * @reg: Register to read.
  53  * @val: Contians the value
  54  */
  55 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
  56                         unsigned int *val)
  57 {
  58         return regmap_read(tps->regmap, reg, val);
  59 }
  60 EXPORT_SYMBOL_GPL(tps65217_reg_read);
  61
  62 /**
  63  * tps65217_reg_write: Write a single tps65217 register.
  64  *
  65  * @tps65217: Device to write to.
  66  * @reg: Register to write to.
  67  * @val: Value to write.
  68  * @level: Password protected level
  69  */
  70 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
  71                         unsigned int val, unsigned int level)
  72 {
  73         int ret;
  74         unsigned int xor_reg_val;
  75
  76         switch (level) {
  77         case TPS65217_PROTECT_NONE:
  78                 return regmap_write(tps->regmap, reg, val);
  79         case TPS65217_PROTECT_L1:
  80                 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  81                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  82                                                         xor_reg_val);
  83                 if (ret < 0)
  84                         return ret;
  85
  86                 return regmap_write(tps->regmap, reg, val);
  87         case TPS65217_PROTECT_L2:
  88                 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  89                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  90                                                         xor_reg_val);
  91                 if (ret < 0)
  92                         return ret;
  93                 ret = regmap_write(tps->regmap, reg, val);
  94                 if (ret < 0)
  95                         return ret;
  96                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  97                                                         xor_reg_val);
  98                 if (ret < 0)
  99                         return ret;
 100                 return regmap_write(tps->regmap, reg, val);
 101         default:
 102                 return -EINVAL;
 103         }
 104 }
 105 EXPORT_SYMBOL_GPL(tps65217_reg_write);
 106
 107 /**
 108  * tps65217_update_bits: Modify bits w.r.t mask, val and level.
 109  *
 110  * @tps65217: Device to write to.
 111  * @reg: Register to read-write to.
 112  * @mask: Mask.
 113  * @val: Value to write.
 114  * @level: Password protected level
 115  */
 116 static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 117                 unsigned int mask, unsigned int val, unsigned int level)
 118 {
 119         int ret;
 120         unsigned int data;
 121
 122         ret = tps65217_reg_read(tps, reg, &data);
 123         if (ret) {
 124                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 125                 return ret;
 126         }
 127
 128         data &= ~mask;
 129         data |= val & mask;
 130
 131         ret = tps65217_reg_write(tps, reg, data, level);
 132         if (ret)
 133                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
 134
 135         return ret;
 136 }
 137
 138 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 139                 unsigned int mask, unsigned int val, unsigned int level)
 140 {
 141         return tps65217_update_bits(tps, reg, mask, val, level);
 142 }
 143 EXPORT_SYMBOL_GPL(tps65217_set_bits);
 144
 145 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 146                 unsigned int mask, unsigned int level)
 147 {
 148         return tps65217_update_bits(tps, reg, mask, 0, level);
 149 }
 150 EXPORT_SYMBOL_GPL(tps65217_clear_bits);
 151
 152 static const struct regmap_config tps65217_regmap_config = {
 153         .reg_bits = 8,
 154         .val_bits = 8,
 155
 156         .max_register = TPS65217_REG_MAX,
 157 };
 158
 159 static const struct of_device_id tps65217_of_match[] = {
 160         { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 161         { /* sentinel */ },
 162 };
 163 MODULE_DEVICE_TABLE(of, tps65217_of_match);
 164
 165 static int tps65217_probe(struct i2c_client *client,
 166                                 const struct i2c_device_id *ids)
 167 {
 168         struct tps65217 *tps;
 169         unsigned int version;
 170         unsigned long chip_id = ids->driver_data;
 171         const struct of_device_id *match;
 172         bool status_off = false;
 173         int ret;
 174
 175         if (client->dev.of_node) {
 176                 match = of_match_device(tps65217_of_match, &client->dev);
 177                 if (!match) {
 178                         dev_err(&client->dev,
 179                                 "Failed to find matching dt id\n");
 180                         return -EINVAL;
 181                 }
 182                 chip_id = (unsigned long)match->data;
 183                 status_off = of_property_read_bool(client->dev.of_node,
 184                                         "ti,pmic-shutdown-controller");
 185         }
 186
 187         if (!chip_id) {
 188                 dev_err(&client->dev, "id is null.\n");
 189                 return -ENODEV;
 190         }
 191
 192         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 193         if (!tps)
 194                 return -ENOMEM;
 195
 196         i2c_set_clientdata(client, tps);
 197         tps->dev = &client->dev;
 198         tps->id = chip_id;
 199
 200         tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 201         if (IS_ERR(tps->regmap)) {
 202                 ret = PTR_ERR(tps->regmap);
 203                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
 204                         ret);
 205                 return ret;
 206         }
 207
 208         ret = mfd_add_devices(tps->dev, -1, tps65217s,
 209                               ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 210         if (ret < 0) {
 211                 dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 212                 return ret;
 213         }
 214
 215         ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 216         if (ret < 0) {
 217                 dev_err(tps->dev, "Failed to read revision register: %d\n",
 218                         ret);
 219                 return ret;
 220         }
 221
 222         /* Set the PMIC to shutdown on PWR_EN toggle */
 223         if (status_off) {
 224                 ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
 225                                 TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
 226                                 TPS65217_PROTECT_NONE);
 227                 if (ret)
 228                         dev_warn(tps->dev, "unable to set the status OFF\n");
 229         }
 230
 231         dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 232                         (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 233                         version & TPS65217_CHIPID_REV_MASK);
 234
 235         return 0;
 236 }
 237
 238 static int tps65217_remove(struct i2c_client *client)
 239 {
 240         struct tps65217 *tps = i2c_get_clientdata(client);
 241
 242         mfd_remove_devices(tps->dev);
 243
 244         return 0;
 245 }
 246
 247 static const struct i2c_device_id tps65217_id_table[] = {
 248         {"tps65217", TPS65217},
 249         { /* sentinel */ }
 250 };
 251 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
 252
 253 static struct i2c_driver tps65217_driver = {
 254         .driver         = {
 255                 .name   = "tps65217",
 256                 .of_match_table = tps65217_of_match,
 257         },
 258         .id_table       = tps65217_id_table,
 259         .probe          = tps65217_probe,
 260         .remove         = tps65217_remove,
 261 };
 262
 263 static int __init tps65217_init(void)
 264 {
 265         return i2c_add_driver(&tps65217_driver);
 266 }
 267 subsys_initcall(tps65217_init);
 268
 269 static void __exit tps65217_exit(void)
 270 {
 271         i2c_del_driver(&tps65217_driver);
 272 }
 273 module_exit(tps65217_exit);
 274
 275 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 276 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 277 MODULE_LICENSE("GPL v2");