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