1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * I2C driver for Marvell 88PM80x 4 * 5 * Copyright (C) 2012 Marvell International Ltd. 6 * Haojian Zhuang <haojian.zhuang@marvell.com> 7 * Joseph(Yossi) Hanin <yhanin@marvell.com> 8 * Qiao Zhou <zhouqiao@marvell.com> 9 */ 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/i2c.h> 13 #include <linux/mfd/88pm80x.h> 14 #include <linux/slab.h> 15 #include <linux/uaccess.h> 16 #include <linux/err.h> 17 18 /* 88pm80x chips have same definition for chip id register. */ 19 #define PM80X_CHIP_ID (0x00) 20 #define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7) 21 #define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F) 22 23 struct pm80x_chip_mapping { 24 unsigned int id; 25 int type; 26 }; 27 28 static struct pm80x_chip_mapping chip_mapping[] = { 29 /* 88PM800 chip id number */ 30 {0x3, CHIP_PM800}, 31 /* 88PM805 chip id number */ 32 {0x0, CHIP_PM805}, 33 /* 88PM860 chip id number */ 34 {0x4, CHIP_PM860}, 35 }; 36 37 /* 38 * workaround: some registers needed by pm805 are defined in pm800, so 39 * need to use this global variable to maintain the relation between 40 * pm800 and pm805. would remove it after HW chip fixes the issue. 41 */ 42 static struct pm80x_chip *g_pm80x_chip; 43 44 const struct regmap_config pm80x_regmap_config = { 45 .reg_bits = 8, 46 .val_bits = 8, 47 }; 48 EXPORT_SYMBOL_GPL(pm80x_regmap_config); 49 50 51 int pm80x_init(struct i2c_client *client) 52 { 53 struct pm80x_chip *chip; 54 struct regmap *map; 55 unsigned int val; 56 int i, ret = 0; 57 58 chip = 59 devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL); 60 if (!chip) 61 return -ENOMEM; 62 63 map = devm_regmap_init_i2c(client, &pm80x_regmap_config); 64 if (IS_ERR(map)) { 65 ret = PTR_ERR(map); 66 dev_err(&client->dev, "Failed to allocate register map: %d\n", 67 ret); 68 return ret; 69 } 70 71 chip->client = client; 72 chip->regmap = map; 73 74 chip->irq = client->irq; 75 76 chip->dev = &client->dev; 77 i2c_set_clientdata(chip->client, chip); 78 79 ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val); 80 if (ret < 0) { 81 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret); 82 return ret; 83 } 84 85 for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) { 86 if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) { 87 chip->type = chip_mapping[i].type; 88 break; 89 } 90 } 91 92 if (i == ARRAY_SIZE(chip_mapping)) { 93 dev_err(chip->dev, 94 "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val); 95 return -EINVAL; 96 } 97 98 device_init_wakeup(&client->dev, 1); 99 100 /* 101 * workaround: set g_pm80x_chip to the first probed chip. if the 102 * second chip is probed, just point to the companion to each 103 * other so that pm805 can access those specific register. would 104 * remove it after HW chip fixes the issue. 105 */ 106 if (!g_pm80x_chip) 107 g_pm80x_chip = chip; 108 else { 109 chip->companion = g_pm80x_chip->client; 110 g_pm80x_chip->companion = chip->client; 111 } 112 113 return 0; 114 } 115 EXPORT_SYMBOL_GPL(pm80x_init); 116 117 int pm80x_deinit(void) 118 { 119 /* 120 * workaround: clear the dependency between pm800 and pm805. 121 * would remove it after HW chip fixes the issue. 122 */ 123 if (g_pm80x_chip->companion) 124 g_pm80x_chip->companion = NULL; 125 else 126 g_pm80x_chip = NULL; 127 return 0; 128 } 129 EXPORT_SYMBOL_GPL(pm80x_deinit); 130 131 static int pm80x_suspend(struct device *dev) 132 { 133 struct i2c_client *client = to_i2c_client(dev); 134 struct pm80x_chip *chip = i2c_get_clientdata(client); 135 136 if (chip && chip->wu_flag) 137 if (device_may_wakeup(chip->dev)) 138 enable_irq_wake(chip->irq); 139 140 return 0; 141 } 142 143 static int pm80x_resume(struct device *dev) 144 { 145 struct i2c_client *client = to_i2c_client(dev); 146 struct pm80x_chip *chip = i2c_get_clientdata(client); 147 148 if (chip && chip->wu_flag) 149 if (device_may_wakeup(chip->dev)) 150 disable_irq_wake(chip->irq); 151 152 return 0; 153 } 154 155 EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); 156 157 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x"); 158 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); 159 MODULE_LICENSE("GPL"); 160