Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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 | |
Chao Xie | 03dcc54 | 2013-06-14 01:21:51 -0400 | [diff] [blame] | 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}, |
Vaibhav Hiremath | 62a2e63 | 2015-08-25 14:34:28 +0530 | [diff] [blame] | 36 | /* 88PM860 chip id number */ |
| 37 | {0x4, CHIP_PM860}, |
Chao Xie | 03dcc54 | 2013-06-14 01:21:51 -0400 | [diff] [blame] | 38 | }; |
| 39 | |
Qiao Zhou | 5500e39 | 2012-07-09 14:37:33 +0800 | [diff] [blame] | 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; |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 46 | |
| 47 | const struct regmap_config pm80x_regmap_config = { |
| 48 | .reg_bits = 8, |
| 49 | .val_bits = 8, |
| 50 | }; |
Axel Lin | 78a73e5 | 2012-07-09 22:44:21 +0800 | [diff] [blame] | 51 | EXPORT_SYMBOL_GPL(pm80x_regmap_config); |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 52 | |
Chao Xie | 03dcc54 | 2013-06-14 01:21:51 -0400 | [diff] [blame] | 53 | |
| 54 | int pm80x_init(struct i2c_client *client) |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 55 | { |
| 56 | struct pm80x_chip *chip; |
| 57 | struct regmap *map; |
Chao Xie | 03dcc54 | 2013-06-14 01:21:51 -0400 | [diff] [blame] | 58 | unsigned int val; |
| 59 | int i, ret = 0; |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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); |
Yi Zhang | 306df79 | 2013-01-22 10:43:45 +0800 | [diff] [blame] | 71 | return ret; |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 72 | } |
| 73 | |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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 | |
Chao Xie | 03dcc54 | 2013-06-14 01:21:51 -0400 | [diff] [blame] | 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 | |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 102 | device_init_wakeup(&client->dev, 1); |
| 103 | |
Qiao Zhou | 5500e39 | 2012-07-09 14:37:33 +0800 | [diff] [blame] | 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 | |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 117 | return 0; |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 118 | } |
| 119 | EXPORT_SYMBOL_GPL(pm80x_init); |
| 120 | |
Yi Zhang | 306df79 | 2013-01-22 10:43:45 +0800 | [diff] [blame] | 121 | int pm80x_deinit(void) |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 122 | { |
Qiao Zhou | 5500e39 | 2012-07-09 14:37:33 +0800 | [diff] [blame] | 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; |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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 | { |
Geliang Tang | 1b5420e | 2015-12-28 23:00:14 +0800 | [diff] [blame^] | 138 | struct i2c_client *client = to_i2c_client(dev); |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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 | { |
Geliang Tang | 1b5420e | 2015-12-28 23:00:14 +0800 | [diff] [blame^] | 150 | struct i2c_client *client = to_i2c_client(dev); |
Qiao Zhou | 70c6cce | 2012-07-09 14:37:32 +0800 | [diff] [blame] | 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"); |