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                 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
  86 err_chip_id:
  87         regmap_exit(map);
  88 err_regmap_init:
  89         devm_kfree(&client->dev, chip);
  90         return ret;
  91 }
  92 EXPORT_SYMBOL_GPL(pm80x_init);
  93
  94 int 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 }
 112 EXPORT_SYMBOL_GPL(pm80x_deinit);
 113
 114 #ifdef CONFIG_PM_SLEEP
 115 static 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
 127 static 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
 140 SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
 141 EXPORT_SYMBOL_GPL(pm80x_pm_ops);
 142
 143 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
 144 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 145 MODULE_LICENSE("GPL");