164 lines
3.8 KiB
C
164 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* I2C driver for Marvell 88PM80x
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*
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* Copyright (C) 2012 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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* Joseph(Yossi) Hanin <yhanin@marvell.com>
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* Qiao Zhou <zhouqiao@marvell.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/mfd/88pm80x.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/err.h>
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/* 88pm80x chips have same definition for chip id register. */
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#define PM80X_CHIP_ID (0x00)
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#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
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#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
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struct pm80x_chip_mapping {
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unsigned int id;
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int type;
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};
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static struct pm80x_chip_mapping chip_mapping[] = {
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/* 88PM800 chip id number */
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{0x3, CHIP_PM800},
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/* 88PM805 chip id number */
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{0x0, CHIP_PM805},
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/* 88PM860 chip id number */
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{0x4, CHIP_PM860},
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};
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/*
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* workaround: some registers needed by pm805 are defined in pm800, so
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* need to use this global variable to maintain the relation between
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* pm800 and pm805. would remove it after HW chip fixes the issue.
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*/
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static struct pm80x_chip *g_pm80x_chip;
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const struct regmap_config pm80x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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EXPORT_SYMBOL_GPL(pm80x_regmap_config);
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int pm80x_init(struct i2c_client *client)
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{
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struct pm80x_chip *chip;
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struct regmap *map;
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unsigned int val;
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int i, ret = 0;
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chip =
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devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
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if (IS_ERR(map)) {
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ret = PTR_ERR(map);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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chip->client = client;
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chip->regmap = map;
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chip->irq = client->irq;
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chip->dev = &client->dev;
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dev_set_drvdata(chip->dev, chip);
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i2c_set_clientdata(chip->client, chip);
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ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
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return ret;
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}
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for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
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if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
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chip->type = chip_mapping[i].type;
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break;
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}
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}
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if (i == ARRAY_SIZE(chip_mapping)) {
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dev_err(chip->dev,
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"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
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return -EINVAL;
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}
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device_init_wakeup(&client->dev, 1);
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/*
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* workaround: set g_pm80x_chip to the first probed chip. if the
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* second chip is probed, just point to the companion to each
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* other so that pm805 can access those specific register. would
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* remove it after HW chip fixes the issue.
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*/
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if (!g_pm80x_chip)
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g_pm80x_chip = chip;
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else {
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chip->companion = g_pm80x_chip->client;
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g_pm80x_chip->companion = chip->client;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(pm80x_init);
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int pm80x_deinit(void)
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{
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/*
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* workaround: clear the dependency between pm800 and pm805.
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* would remove it after HW chip fixes the issue.
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*/
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if (g_pm80x_chip->companion)
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g_pm80x_chip->companion = NULL;
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else
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g_pm80x_chip = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(pm80x_deinit);
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#ifdef CONFIG_PM_SLEEP
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static int pm80x_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pm80x_chip *chip = i2c_get_clientdata(client);
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if (chip && chip->wu_flag)
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if (device_may_wakeup(chip->dev))
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enable_irq_wake(chip->irq);
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return 0;
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}
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static int pm80x_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pm80x_chip *chip = i2c_get_clientdata(client);
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if (chip && chip->wu_flag)
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if (device_may_wakeup(chip->dev))
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disable_irq_wake(chip->irq);
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return 0;
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}
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#endif
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SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
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EXPORT_SYMBOL_GPL(pm80x_pm_ops);
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MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
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MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
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MODULE_LICENSE("GPL");
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