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                .name = "tps65217-bl",
  39        },
  40};
  41
  42/**
  43 * tps65217_reg_read: Read a single tps65217 register.
  44 *
  45 * @tps: Device to read from.
  46 * @reg: Register to read.
  47 * @val: Contians the value
  48 */
  49int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
  50                        unsigned int *val)
  51{
  52        return regmap_read(tps->regmap, reg, val);
  53}
  54EXPORT_SYMBOL_GPL(tps65217_reg_read);
  55
  56/**
  57 * tps65217_reg_write: Write a single tps65217 register.
  58 *
  59 * @tps65217: Device to write to.
  60 * @reg: Register to write to.
  61 * @val: Value to write.
  62 * @level: Password protected level
  63 */
  64int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
  65                        unsigned int val, unsigned int level)
  66{
  67        int ret;
  68        unsigned int xor_reg_val;
  69
  70        switch (level) {
  71        case TPS65217_PROTECT_NONE:
  72                return regmap_write(tps->regmap, reg, val);
  73        case TPS65217_PROTECT_L1:
  74                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  75                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  76                                                        xor_reg_val);
  77                if (ret < 0)
  78                        return ret;
  79
  80                return regmap_write(tps->regmap, reg, val);
  81        case TPS65217_PROTECT_L2:
  82                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
  83                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  84                                                        xor_reg_val);
  85                if (ret < 0)
  86                        return ret;
  87                ret = regmap_write(tps->regmap, reg, val);
  88                if (ret < 0)
  89                        return ret;
  90                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
  91                                                        xor_reg_val);
  92                if (ret < 0)
  93                        return ret;
  94                return regmap_write(tps->regmap, reg, val);
  95        default:
  96                return -EINVAL;
  97        }
  98}
  99EXPORT_SYMBOL_GPL(tps65217_reg_write);
 100
 101/**
 102 * tps65217_update_bits: Modify bits w.r.t mask, val and level.
 103 *
 104 * @tps65217: Device to write to.
 105 * @reg: Register to read-write to.
 106 * @mask: Mask.
 107 * @val: Value to write.
 108 * @level: Password protected level
 109 */
 110static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
 111                unsigned int mask, unsigned int val, unsigned int level)
 112{
 113        int ret;
 114        unsigned int data;
 115
 116        ret = tps65217_reg_read(tps, reg, &data);
 117        if (ret) {
 118                dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
 119                return ret;
 120        }
 121
 122        data &= ~mask;
 123        data |= val & mask;
 124
 125        ret = tps65217_reg_write(tps, reg, data, level);
 126        if (ret)
 127                dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
 128
 129        return ret;
 130}
 131
 132int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
 133                unsigned int mask, unsigned int val, unsigned int level)
 134{
 135        return tps65217_update_bits(tps, reg, mask, val, level);
 136}
 137EXPORT_SYMBOL_GPL(tps65217_set_bits);
 138
 139int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
 140                unsigned int mask, unsigned int level)
 141{
 142        return tps65217_update_bits(tps, reg, mask, 0, level);
 143}
 144EXPORT_SYMBOL_GPL(tps65217_clear_bits);
 145
 146static struct regmap_config tps65217_regmap_config = {
 147        .reg_bits = 8,
 148        .val_bits = 8,
 149};
 150
 151static const struct of_device_id tps65217_of_match[] = {
 152        { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
 153        { /* sentinel */ },
 154};
 155
 156static int __devinit tps65217_probe(struct i2c_client *client,
 157                                const struct i2c_device_id *ids)
 158{
 159        struct tps65217 *tps;
 160        unsigned int version;
 161        unsigned int chip_id = ids->driver_data;
 162        const struct of_device_id *match;
 163        int ret;
 164
 165        if (client->dev.of_node) {
 166                match = of_match_device(tps65217_of_match, &client->dev);
 167                if (!match) {
 168                        dev_err(&client->dev,
 169                                "Failed to find matching dt id\n");
 170                        return -EINVAL;
 171                }
 172                chip_id = (unsigned int)match->data;
 173        }
 174
 175        if (!chip_id) {
 176                dev_err(&client->dev, "id is null.\n");
 177                return -ENODEV;
 178        }
 179
 180        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 181        if (!tps)
 182                return -ENOMEM;
 183
 184        i2c_set_clientdata(client, tps);
 185        tps->dev = &client->dev;
 186        tps->id = chip_id;
 187
 188        tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 189        if (IS_ERR(tps->regmap)) {
 190                ret = PTR_ERR(tps->regmap);
 191                dev_err(tps->dev, "Failed to allocate register map: %d\n",
 192                        ret);
 193                return ret;
 194        }
 195
 196        ret = mfd_add_devices(tps->dev, -1, tps65217s,
 197                              ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 198        if (ret < 0) {
 199                dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 200                return ret;
 201        }
 202
 203        ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 204        if (ret < 0) {
 205                dev_err(tps->dev, "Failed to read revision register: %d\n",
 206                        ret);
 207                return ret;
 208        }
 209
 210        dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 211                        (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 212                        version & TPS65217_CHIPID_REV_MASK);
 213
 214        return 0;
 215}
 216
 217static int __devexit tps65217_remove(struct i2c_client *client)
 218{
 219        struct tps65217 *tps = i2c_get_clientdata(client);
 220
 221        mfd_remove_devices(tps->dev);
 222
 223        return 0;
 224}
 225
 226static const struct i2c_device_id tps65217_id_table[] = {
 227        {"tps65217", TPS65217},
 228        { /* sentinel */ }
 229};
 230MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
 231
 232static struct i2c_driver tps65217_driver = {
 233        .driver         = {
 234                .name   = "tps65217",
 235                .owner  = THIS_MODULE,
 236                .of_match_table = of_match_ptr(tps65217_of_match),
 237        },
 238        .id_table       = tps65217_id_table,
 239        .probe          = tps65217_probe,
 240        .remove         = __devexit_p(tps65217_remove),
 241};
 242
 243static int __init tps65217_init(void)
 244{
 245        return i2c_add_driver(&tps65217_driver);
 246}
 247subsys_initcall(tps65217_init);
 248
 249static void __exit tps65217_exit(void)
 250{
 251        i2c_del_driver(&tps65217_driver);
 252}
 253module_exit(tps65217_exit);
 254
 255MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 256MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 257MODULE_LICENSE("GPL v2");
 258
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