LXR linux/drivers/mfd/88pm80x.c

   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/* 88pm80x chips have same definition for chip id register. */
  22#define PM80X_CHIP_ID                   (0x00)
  23#define PM80X_CHIP_ID_NUM(x)            (((x) >> 5) & 0x7)
  24#define PM80X_CHIP_ID_REVISION(x)       ((x) & 0x1F)
  25
  26struct pm80x_chip_mapping {
  27        unsigned int    id;
  28        int             type;
  29};
  30
  31static struct pm80x_chip_mapping chip_mapping[] = {
  32        /* 88PM800 chip id number */
  33        {0x3,   CHIP_PM800},
  34        /* 88PM805 chip id number */
  35        {0x0,   CHIP_PM805},
  36        /* 88PM860 chip id number */
  37        {0x4,   CHIP_PM860},
  38};
  39
  40/*
  41 * workaround: some registers needed by pm805 are defined in pm800, so
  42 * need to use this global variable to maintain the relation between
  43 * pm800 and pm805. would remove it after HW chip fixes the issue.
  44 */
  45static struct pm80x_chip *g_pm80x_chip;
  46
  47const struct regmap_config pm80x_regmap_config = {
  48        .reg_bits = 8,
  49        .val_bits = 8,
  50};
  51EXPORT_SYMBOL_GPL(pm80x_regmap_config);
  52
  53
  54int pm80x_init(struct i2c_client *client)
  55{
  56        struct pm80x_chip *chip;
  57        struct regmap *map;
  58        unsigned int val;
  59        int i, ret = 0;
  60
  61        chip =
  62            devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
  63        if (!chip)
  64                return -ENOMEM;
  65
  66        map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
  67        if (IS_ERR(map)) {
  68                ret = PTR_ERR(map);
  69                dev_err(&client->dev, "Failed to allocate register map: %d\n",
  70                        ret);
  71                return ret;
  72        }
  73
  74        chip->client = client;
  75        chip->regmap = map;
  76
  77        chip->irq = client->irq;
  78
  79        chip->dev = &client->dev;
  80        dev_set_drvdata(chip->dev, chip);
  81        i2c_set_clientdata(chip->client, chip);
  82
  83        ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
  84        if (ret < 0) {
  85                dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
  86                return ret;
  87        }
  88
  89        for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
  90                if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
  91                        chip->type = chip_mapping[i].type;
  92                        break;
  93                }
  94        }
  95
  96        if (i == ARRAY_SIZE(chip_mapping)) {
  97                dev_err(chip->dev,
  98                        "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
  99                return -EINVAL;
 100        }
 101
 102        device_init_wakeup(&client->dev, 1);
 103
 104        /*
 105         * workaround: set g_pm80x_chip to the first probed chip. if the
 106         * second chip is probed, just point to the companion to each
 107         * other so that pm805 can access those specific register. would
 108         * remove it after HW chip fixes the issue.
 109         */
 110        if (!g_pm80x_chip)
 111                g_pm80x_chip = chip;
 112        else {
 113                chip->companion = g_pm80x_chip->client;
 114                g_pm80x_chip->companion = chip->client;
 115        }
 116
 117        return 0;
 118}
 119EXPORT_SYMBOL_GPL(pm80x_init);
 120
 121int pm80x_deinit(void)
 122{
 123        /*
 124         * workaround: clear the dependency between pm800 and pm805.
 125         * would remove it after HW chip fixes the issue.
 126         */
 127        if (g_pm80x_chip->companion)
 128                g_pm80x_chip->companion = NULL;
 129        else
 130                g_pm80x_chip = NULL;
 131        return 0;
 132}
 133EXPORT_SYMBOL_GPL(pm80x_deinit);
 134
 135#ifdef CONFIG_PM_SLEEP
 136static int pm80x_suspend(struct device *dev)
 137{
 138        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 139        struct pm80x_chip *chip = i2c_get_clientdata(client);
 140
 141        if (chip && chip->wu_flag)
 142                if (device_may_wakeup(chip->dev))
 143                        enable_irq_wake(chip->irq);
 144
 145        return 0;
 146}
 147
 148static int pm80x_resume(struct device *dev)
 149{
 150        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 151        struct pm80x_chip *chip = i2c_get_clientdata(client);
 152
 153        if (chip && chip->wu_flag)
 154                if (device_may_wakeup(chip->dev))
 155                        disable_irq_wake(chip->irq);
 156
 157        return 0;
 158}
 159#endif
 160
 161SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
 162EXPORT_SYMBOL_GPL(pm80x_pm_ops);
 163
 164MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
 165MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 166MODULE_LICENSE("GPL");
 167