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 /* 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 */ 45 static struct pm80x_chip *g_pm80x_chip; 46 47 const struct regmap_config pm80x_regmap_config = { 48 .reg_bits = 8, 49 .val_bits = 8, 50 }; 51 EXPORT_SYMBOL_GPL(pm80x_regmap_config); 52 53 54 int 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 } 119 EXPORT_SYMBOL_GPL(pm80x_init); 120 121 int 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 } 133 EXPORT_SYMBOL_GPL(pm80x_deinit); 134 135 #ifdef CONFIG_PM_SLEEP 136 static int pm80x_suspend(struct device *dev) 137 { 138 struct i2c_client *client = to_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 } 147 148 static int pm80x_resume(struct device *dev) 149 { 150 struct i2c_client *client = to_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 160 161 SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); 162 EXPORT_SYMBOL_GPL(pm80x_pm_ops); 163 164 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x"); 165 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); 166 MODULE_LICENSE("GPL"); 167