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 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        bool status_off = false;
 164        int ret;
 165
 166        if (client->dev.of_node) {
 167                match = of_match_device(tps65217_of_match, &client->dev);
 168                if (!match) {
 169                        dev_err(&client->dev,
 170                                "Failed to find matching dt id\n");
 171                        return -EINVAL;
 172                }
 173                chip_id = (unsigned int)match->data;
 174                status_off = of_property_read_bool(client->dev.of_node,
 175                                        "ti,pmic-shutdown-controller");
 176        }
 177
 178        if (!chip_id) {
 179                dev_err(&client->dev, "id is null.\n");
 180                return -ENODEV;
 181        }
 182
 183        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 184        if (!tps)
 185                return -ENOMEM;
 186
 187        i2c_set_clientdata(client, tps);
 188        tps->dev = &client->dev;
 189        tps->id = chip_id;
 190
 191        tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
 192        if (IS_ERR(tps->regmap)) {
 193                ret = PTR_ERR(tps->regmap);
 194                dev_err(tps->dev, "Failed to allocate register map: %d\n",
 195                        ret);
 196                return ret;
 197        }
 198
 199        ret = mfd_add_devices(tps->dev, -1, tps65217s,
 200                              ARRAY_SIZE(tps65217s), NULL, 0, NULL);
 201        if (ret < 0) {
 202                dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
 203                return ret;
 204        }
 205
 206        ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
 207        if (ret < 0) {
 208                dev_err(tps->dev, "Failed to read revision register: %d\n",
 209                        ret);
 210                return ret;
 211        }
 212
 213        /* Set the PMIC to shutdown on PWR_EN toggle */
 214        if (status_off) {
 215                ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
 216                                TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
 217                                TPS65217_PROTECT_NONE);
 218                if (ret)
 219                        dev_warn(tps->dev, "unable to set the status OFF\n");
 220        }
 221
 222        dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
 223                        (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
 224                        version & TPS65217_CHIPID_REV_MASK);
 225
 226        return 0;
 227}
 228
 229static int tps65217_remove(struct i2c_client *client)
 230{
 231        struct tps65217 *tps = i2c_get_clientdata(client);
 232
 233        mfd_remove_devices(tps->dev);
 234
 235        return 0;
 236}
 237
 238static const struct i2c_device_id tps65217_id_table[] = {
 239        {"tps65217", TPS65217},
 240        { /* sentinel */ }
 241};
 242MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
 243
 244static struct i2c_driver tps65217_driver = {
 245        .driver         = {
 246                .name   = "tps65217",
 247                .owner  = THIS_MODULE,
 248                .of_match_table = of_match_ptr(tps65217_of_match),
 249        },
 250        .id_table       = tps65217_id_table,
 251        .probe          = tps65217_probe,
 252        .remove         = tps65217_remove,
 253};
 254
 255static int __init tps65217_init(void)
 256{
 257        return i2c_add_driver(&tps65217_driver);
 258}
 259subsys_initcall(tps65217_init);
 260
 261static void __exit tps65217_exit(void)
 262{
 263        i2c_del_driver(&tps65217_driver);
 264}
 265module_exit(tps65217_exit);
 266
 267MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 268MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
 269MODULE_LICENSE("GPL v2");
 270
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