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
  44 /**
  45  * tps65217_reg_read: Read a single tps65217 register.
  46  *
  47  * @tps: Device to read from.
  48  * @reg: Register to read.
  49  * @val: Contians the value
  50  */
  51 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
  52                         unsigned int *val)
  53 {
  54         return regmap_read(tps->regmap, reg, val);
  55 }
  56 EXPORT_SYMBOL_GPL(tps65217_reg_read);
  57
  58 /**
  59  * tps65217_reg_write: Write a single tps65217 register.
  60  *
  61  * @tps65217: Device to write to.
  62  * @reg: Register to write to.
  63  * @val: Value to write.
  64  * @level: Password protected level
  65  */
  66 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
  67                         unsigned int val, unsigned int level)
  68 {
  69         int ret;
  70         unsigned int xor_reg_val;
  71
  72         switch (level) {
  73         case TPS65217_PROTECT_NONE:
  74                 return regmap_write(tps->regmap, reg, val);
  75         case TPS65217_PROTECT_L1:
  76                 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  77                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  78                                                         xor_reg_val);
  79                 if (ret < 0)
  80                         return ret;
  81
  82                 return regmap_write(tps->regmap, reg, val);
  83         case TPS65217_PROTECT_L2:
  84                 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  85                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  86                                                         xor_reg_val);
  87                 if (ret < 0)
  88                         return ret;
  89                 ret = regmap_write(tps->regmap, reg, val);
  90                 if (ret < 0)
  91                         return ret;
  92                 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  93                                                         xor_reg_val);
  94                 if (ret < 0)
  95                         return ret;
  96                 return regmap_write(tps->regmap, reg, val);
  97         default:
  98                 return -EINVAL;
  99         }
 100 }
 101 EXPORT_SYMBOL_GPL(tps65217_reg_write);
 102
 103 /**
 104  * tps65217_update_bits: Modify bits w.r.t mask, val and level.
 105  *
 106  * @tps65217: Device to write to.
 107  * @reg: Register to read-write to.
 108  * @mask: Mask.
 109  * @val: Value to write.
 110  * @level: Password protected level
 111  */
 112 static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 113                 unsigned int mask, unsigned int val, unsigned int level)
 114 {
 115         int ret;
 116         unsigned int data;
 117
 118         ret = tps65217_reg_read(tps, reg, &data);
 119         if (ret) {
 120                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 121                 return ret;
 122         }
 123
 124         data &= ~mask;
 125         data |= val & mask;
 126
 127         ret = tps65217_reg_write(tps, reg, data, level);
 128         if (ret)
 129                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
 130
 131         return ret;
 132 }
 133
 134 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 135                 unsigned int mask, unsigned int val, unsigned int level)
 136 {
 137         return tps65217_update_bits(tps, reg, mask, val, level);
 138 }
 139 EXPORT_SYMBOL_GPL(tps65217_set_bits);
 140
 141 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 142                 unsigned int mask, unsigned int level)
 143 {
 144         return tps65217_update_bits(tps, reg, mask, 0, level);
 145 }
 146 EXPORT_SYMBOL_GPL(tps65217_clear_bits);
 147
 148 static const struct regmap_config tps65217_regmap_config = {
 149         .reg_bits = 8,
 150         .val_bits = 8,
 151
 152         .max_register = TPS65217_REG_MAX,
 153 };
 154
 155 static const struct of_device_id tps65217_of_match[] = {
 156         { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 157         { /* sentinel */ },
 158 };
 159
 160 static int tps65217_probe(struct i2c_client *client,
 161                                 const struct i2c_device_id *ids)
 162 {
 163         struct tps65217 *tps;
 164         unsigned int version;
 165         unsigned long chip_id = ids->driver_data;
 166         const struct of_device_id *match;
 167         bool status_off = false;
 168         int ret;
 169
 170         if (client->dev.of_node) {
 171                 match = of_match_device(tps65217_of_match, &client->dev);
 172                 if (!match) {
 173                         dev_err(&client->dev,
 174                                 "Failed to find matching dt id\n");
 175                         return -EINVAL;
 176                 }
 177                 chip_id = (unsigned long)match->data;
 178                 status_off = of_property_read_bool(client->dev.of_node,
 179                                         "ti,pmic-shutdown-controller");
 180         }
 181
 182         if (!chip_id) {
 183                 dev_err(&client->dev, "id is null.\n");
 184                 return -ENODEV;
 185         }
 186
 187         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 188         if (!tps)
 189                 return -ENOMEM;
 190
 191         i2c_set_clientdata(client, tps);
 192         tps->dev = &client->dev;
 193         tps->id = chip_id;
 194
 195         tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 196         if (IS_ERR(tps->regmap)) {
 197                 ret = PTR_ERR(tps->regmap);
 198                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
 199                         ret);
 200                 return ret;
 201         }
 202
 203         ret = mfd_add_devices(tps->dev, -1, tps65217s,
 204                               ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 205         if (ret < 0) {
 206                 dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 207                 return ret;
 208         }
 209
 210         ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 211         if (ret < 0) {
 212                 dev_err(tps->dev, "Failed to read revision register: %d\n",
 213                         ret);
 214                 return ret;
 215         }
 216
 217         /* Set the PMIC to shutdown on PWR_EN toggle */
 218         if (status_off) {
 219                 ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
 220                                 TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
 221                                 TPS65217_PROTECT_NONE);
 222                 if (ret)
 223                         dev_warn(tps->dev, "unable to set the status OFF\n");
 224         }
 225
 226         dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 227                         (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 228                         version & TPS65217_CHIPID_REV_MASK);
 229
 230         return 0;
 231 }
 232
 233 static int tps65217_remove(struct i2c_client *client)
 234 {
 235         struct tps65217 *tps = i2c_get_clientdata(client);
 236
 237         mfd_remove_devices(tps->dev);
 238
 239         return 0;
 240 }
 241
 242 static const struct i2c_device_id tps65217_id_table[] = {
 243         {"tps65217", TPS65217},
 244         { /* sentinel */ }
 245 };
 246 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
 247
 248 static struct i2c_driver tps65217_driver = {
 249         .driver         = {
 250                 .name   = "tps65217",
 251                 .owner  = THIS_MODULE,
 252                 .of_match_table = tps65217_of_match,
 253         },
 254         .id_table       = tps65217_id_table,
 255         .probe          = tps65217_probe,
 256         .remove         = tps65217_remove,
 257 };
 258
 259 static int __init tps65217_init(void)
 260 {
 261         return i2c_add_driver(&tps65217_driver);
 262 }
 263 subsys_initcall(tps65217_init);
 264
 265 static void __exit tps65217_exit(void)
 266 {
 267         i2c_del_driver(&tps65217_driver);
 268 }
 269 module_exit(tps65217_exit);
 270
 271 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 272 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 273 MODULE_LICENSE("GPL v2");