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 /*
  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  */
  26 static struct pm80x_chip *g_pm80x_chip;
  27
  28 const struct regmap_config pm80x_regmap_config = {
  29         .reg_bits = 8,
  30         .val_bits = 8,
  31 };
  32 EXPORT_SYMBOL_GPL(pm80x_regmap_config);
  33
  34 int 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                 return ret;
  52         }
  53
  54         chip->id = id->driver_data;
  55         if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805)
  56                 return -EINVAL;
  57
  58         chip->client = client;
  59         chip->regmap = map;
  60
  61         chip->irq = client->irq;
  62
  63         chip->dev = &client->dev;
  64         dev_set_drvdata(chip->dev, chip);
  65         i2c_set_clientdata(chip->client, chip);
  66
  67         device_init_wakeup(&client->dev, 1);
  68
  69         /*
  70          * workaround: set g_pm80x_chip to the first probed chip. if the
  71          * second chip is probed, just point to the companion to each
  72          * other so that pm805 can access those specific register. would
  73          * remove it after HW chip fixes the issue.
  74          */
  75         if (!g_pm80x_chip)
  76                 g_pm80x_chip = chip;
  77         else {
  78                 chip->companion = g_pm80x_chip->client;
  79                 g_pm80x_chip->companion = chip->client;
  80         }
  81
  82         return 0;
  83 }
  84 EXPORT_SYMBOL_GPL(pm80x_init);
  85
  86 int pm80x_deinit(void)
  87 {
  88         /*
  89          * workaround: clear the dependency between pm800 and pm805.
  90          * would remove it after HW chip fixes the issue.
  91          */
  92         if (g_pm80x_chip->companion)
  93                 g_pm80x_chip->companion = NULL;
  94         else
  95                 g_pm80x_chip = NULL;
  96         return 0;
  97 }
  98 EXPORT_SYMBOL_GPL(pm80x_deinit);
  99
 100 #ifdef CONFIG_PM_SLEEP
 101 static int pm80x_suspend(struct device *dev)
 102 {
 103         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 104         struct pm80x_chip *chip = i2c_get_clientdata(client);
 105
 106         if (chip && chip->wu_flag)
 107                 if (device_may_wakeup(chip->dev))
 108                         enable_irq_wake(chip->irq);
 109
 110         return 0;
 111 }
 112
 113 static int pm80x_resume(struct device *dev)
 114 {
 115         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 116         struct pm80x_chip *chip = i2c_get_clientdata(client);
 117
 118         if (chip && chip->wu_flag)
 119                 if (device_may_wakeup(chip->dev))
 120                         disable_irq_wake(chip->irq);
 121
 122         return 0;
 123 }
 124 #endif
 125
 126 SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
 127 EXPORT_SYMBOL_GPL(pm80x_pm_ops);
 128
 129 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
 130 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 131 MODULE_LICENSE("GPL");