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 __devinit 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"); 146