linux/drivers/mfd/88pm80x.c
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   1/*
   2 * I2C driver for Marvell 88PM80x
   3 *
   4 * Copyright (C) 2012 Marvell International Ltd.
   5 * Haojian Zhuang <haojian.zhuang@marvell.com>
   6 * Joseph(Yossi) Hanin <yhanin@marvell.com>
   7 * Qiao Zhou <zhouqiao@marvell.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/i2c.h>
  16#include <linux/mfd/88pm80x.h>
  17#include <linux/slab.h>
  18#include <linux/uaccess.h>
  19#include <linux/err.h>
  20
  21/*
  22 * workaround: some registers needed by pm805 are defined in pm800, so
  23 * need to use this global variable to maintain the relation between
  24 * pm800 and pm805. would remove it after HW chip fixes the issue.
  25 */
  26static struct pm80x_chip *g_pm80x_chip;
  27
  28const struct regmap_config pm80x_regmap_config = {
  29        .reg_bits = 8,
  30        .val_bits = 8,
  31};
  32EXPORT_SYMBOL_GPL(pm80x_regmap_config);
  33
  34int pm80x_init(struct i2c_client *client,
  35                                 const struct i2c_device_id *id)
  36{
  37        struct pm80x_chip *chip;
  38        struct regmap *map;
  39        int ret = 0;
  40
  41        chip =
  42            devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
  43        if (!chip)
  44                return -ENOMEM;
  45
  46        map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
  47        if (IS_ERR(map)) {
  48                ret = PTR_ERR(map);
  49                dev_err(&client->dev, "Failed to allocate register map: %d\n",
  50                        ret);
  51                goto err_regmap_init;
  52        }
  53
  54        chip->id = id->driver_data;
  55        if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805) {
  56                ret = -EINVAL;
  57                goto err_chip_id;
  58        }
  59
  60        chip->client = client;
  61        chip->regmap = map;
  62
  63        chip->irq = client->irq;
  64
  65        chip->dev = &client->dev;
  66        dev_set_drvdata(chip->dev, chip);
  67        i2c_set_clientdata(chip->client, chip);
  68
  69        device_init_wakeup(&client->dev, 1);
  70
  71        /*
  72         * workaround: set g_pm80x_chip to the first probed chip. if the
  73         * second chip is probed, just point to the companion to each
  74         * other so that pm805 can access those specific register. would
  75         * remove it after HW chip fixes the issue.
  76         */
  77        if (!g_pm80x_chip)
  78                g_pm80x_chip = chip;
  79        else {
  80                chip->companion = g_pm80x_chip->client;
  81                g_pm80x_chip->companion = chip->client;
  82        }
  83
  84        return 0;
  85
  86err_chip_id:
  87        regmap_exit(map);
  88err_regmap_init:
  89        devm_kfree(&client->dev, chip);
  90        return ret;
  91}
  92EXPORT_SYMBOL_GPL(pm80x_init);
  93
  94int pm80x_deinit(struct i2c_client *client)
  95{
  96        struct pm80x_chip *chip = i2c_get_clientdata(client);
  97
  98        /*
  99         * workaround: clear the dependency between pm800 and pm805.
 100         * would remove it after HW chip fixes the issue.
 101         */
 102        if (g_pm80x_chip->companion)
 103                g_pm80x_chip->companion = NULL;
 104        else
 105                g_pm80x_chip = NULL;
 106
 107        regmap_exit(chip->regmap);
 108        devm_kfree(&client->dev, chip);
 109
 110        return 0;
 111}
 112EXPORT_SYMBOL_GPL(pm80x_deinit);
 113
 114#ifdef CONFIG_PM_SLEEP
 115static int pm80x_suspend(struct device *dev)
 116{
 117        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 118        struct pm80x_chip *chip = i2c_get_clientdata(client);
 119
 120        if (chip && chip->wu_flag)
 121                if (device_may_wakeup(chip->dev))
 122                        enable_irq_wake(chip->irq);
 123
 124        return 0;
 125}
 126
 127static int pm80x_resume(struct device *dev)
 128{
 129        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 130        struct pm80x_chip *chip = i2c_get_clientdata(client);
 131
 132        if (chip && chip->wu_flag)
 133                if (device_may_wakeup(chip->dev))
 134                        disable_irq_wake(chip->irq);
 135
 136        return 0;
 137}
 138#endif
 139
 140SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
 141EXPORT_SYMBOL_GPL(pm80x_pm_ops);
 142
 143MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
 144MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 145MODULE_LICENSE("GPL");
 146
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