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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * I2C driver for Marvell 88PM80x4 *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 23struct pm80x_chip_mapping {24 unsigned int id;25 int type;26};27 28static 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, so39 * need to use this global variable to maintain the relation between40 * pm800 and pm805. would remove it after HW chip fixes the issue.41 */42static struct pm80x_chip *g_pm80x_chip;43 44const struct regmap_config pm80x_regmap_config = {45 .reg_bits = 8,46 .val_bits = 8,47};48EXPORT_SYMBOL_GPL(pm80x_regmap_config);49 50 51int 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 the102 * second chip is probed, just point to the companion to each103 * other so that pm805 can access those specific register. would104 * 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}115EXPORT_SYMBOL_GPL(pm80x_init);116 117int 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 else126 g_pm80x_chip = NULL;127 return 0;128}129EXPORT_SYMBOL_GPL(pm80x_deinit);130 131static 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 143static 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 155EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);156 157MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");158MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");159MODULE_LICENSE("GPL");160