linux/drivers/mfd/tps65217.c
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   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
  33static struct mfd_cell tps65217s[] = {
  34        {
  35                .name = "tps65217-pmic",
  36        },
  37};
  38
  39/**
  40 * tps65217_reg_read: Read a single tps65217 register.
  41 *
  42 * @tps: Device to read from.
  43 * @reg: Register to read.
  44 * @val: Contians the value
  45 */
  46int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
  47                        unsigned int *val)
  48{
  49        return regmap_read(tps->regmap, reg, val);
  50}
  51EXPORT_SYMBOL_GPL(tps65217_reg_read);
  52
  53/**
  54 * tps65217_reg_write: Write a single tps65217 register.
  55 *
  56 * @tps65217: Device to write to.
  57 * @reg: Register to write to.
  58 * @val: Value to write.
  59 * @level: Password protected level
  60 */
  61int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
  62                        unsigned int val, unsigned int level)
  63{
  64        int ret;
  65        unsigned int xor_reg_val;
  66
  67        switch (level) {
  68        case TPS65217_PROTECT_NONE:
  69                return regmap_write(tps->regmap, reg, val);
  70        case TPS65217_PROTECT_L1:
  71                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  72                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  73                                                        xor_reg_val);
  74                if (ret < 0)
  75                        return ret;
  76
  77                return regmap_write(tps->regmap, reg, val);
  78        case TPS65217_PROTECT_L2:
  79                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  80                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  81                                                        xor_reg_val);
  82                if (ret < 0)
  83                        return ret;
  84                ret = regmap_write(tps->regmap, reg, val);
  85                if (ret < 0)
  86                        return ret;
  87                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  88                                                        xor_reg_val);
  89                if (ret < 0)
  90                        return ret;
  91                return regmap_write(tps->regmap, reg, val);
  92        default:
  93                return -EINVAL;
  94        }
  95}
  96EXPORT_SYMBOL_GPL(tps65217_reg_write);
  97
  98/**
  99 * tps65217_update_bits: Modify bits w.r.t mask, val and level.
 100 *
 101 * @tps65217: Device to write to.
 102 * @reg: Register to read-write to.
 103 * @mask: Mask.
 104 * @val: Value to write.
 105 * @level: Password protected level
 106 */
 107static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 108                unsigned int mask, unsigned int val, unsigned int level)
 109{
 110        int ret;
 111        unsigned int data;
 112
 113        ret = tps65217_reg_read(tps, reg, &data);
 114        if (ret) {
 115                dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 116                return ret;
 117        }
 118
 119        data &= ~mask;
 120        data |= val & mask;
 121
 122        ret = tps65217_reg_write(tps, reg, data, level);
 123        if (ret)
 124                dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
 125
 126        return ret;
 127}
 128
 129int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 130                unsigned int mask, unsigned int val, unsigned int level)
 131{
 132        return tps65217_update_bits(tps, reg, mask, val, level);
 133}
 134EXPORT_SYMBOL_GPL(tps65217_set_bits);
 135
 136int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 137                unsigned int mask, unsigned int level)
 138{
 139        return tps65217_update_bits(tps, reg, mask, 0, level);
 140}
 141EXPORT_SYMBOL_GPL(tps65217_clear_bits);
 142
 143static struct regmap_config tps65217_regmap_config = {
 144        .reg_bits = 8,
 145        .val_bits = 8,
 146};
 147
 148static const struct of_device_id tps65217_of_match[] = {
 149        { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 150        { /* sentinel */ },
 151};
 152
 153static int __devinit tps65217_probe(struct i2c_client *client,
 154                                const struct i2c_device_id *ids)
 155{
 156        struct tps65217 *tps;
 157        unsigned int version;
 158        unsigned int chip_id = ids->driver_data;
 159        const struct of_device_id *match;
 160        int ret;
 161
 162        if (client->dev.of_node) {
 163                match = of_match_device(tps65217_of_match, &client->dev);
 164                if (!match) {
 165                        dev_err(&client->dev,
 166                                "Failed to find matching dt id\n");
 167                        return -EINVAL;
 168                }
 169                chip_id = (unsigned int)match->data;
 170        }
 171
 172        if (!chip_id) {
 173                dev_err(&client->dev, "id is null.\n");
 174                return -ENODEV;
 175        }
 176
 177        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 178        if (!tps)
 179                return -ENOMEM;
 180
 181        i2c_set_clientdata(client, tps);
 182        tps->dev = &client->dev;
 183        tps->id = chip_id;
 184
 185        tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 186        if (IS_ERR(tps->regmap)) {
 187                ret = PTR_ERR(tps->regmap);
 188                dev_err(tps->dev, "Failed to allocate register map: %d\n",
 189                        ret);
 190                return ret;
 191        }
 192
 193        ret = mfd_add_devices(tps->dev, -1, tps65217s,
 194                              ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 195        if (ret < 0) {
 196                dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 197                return ret;
 198        }
 199
 200        ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 201        if (ret < 0) {
 202                dev_err(tps->dev, "Failed to read revision register: %d\n",
 203                        ret);
 204                return ret;
 205        }
 206
 207        dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 208                        (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 209                        version & TPS65217_CHIPID_REV_MASK);
 210
 211        return 0;
 212}
 213
 214static int __devexit tps65217_remove(struct i2c_client *client)
 215{
 216        struct tps65217 *tps = i2c_get_clientdata(client);
 217
 218        mfd_remove_devices(tps->dev);
 219
 220        return 0;
 221}
 222
 223static const struct i2c_device_id tps65217_id_table[] = {
 224        {"tps65217", TPS65217},
 225        { /* sentinel */ }
 226};
 227MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
 228
 229static struct i2c_driver tps65217_driver = {
 230        .driver         = {
 231                .name   = "tps65217",
 232                .owner  = THIS_MODULE,
 233                .of_match_table = of_match_ptr(tps65217_of_match),
 234        },
 235        .id_table       = tps65217_id_table,
 236        .probe          = tps65217_probe,
 237        .remove         = __devexit_p(tps65217_remove),
 238};
 239
 240static int __init tps65217_init(void)
 241{
 242        return i2c_add_driver(&tps65217_driver);
 243}
 244subsys_initcall(tps65217_init);
 245
 246static void __exit tps65217_exit(void)
 247{
 248        i2c_del_driver(&tps65217_driver);
 249}
 250module_exit(tps65217_exit);
 251
 252MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 253MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 254MODULE_LICENSE("GPL v2");
 255
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