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163 lines
3.8 KiB
163 lines
3.8 KiB
// 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 <[email protected]> |
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* Joseph(Yossi) Hanin <[email protected]> |
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* Qiao Zhou <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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