/* * I2C driver for Marvell 88PM80x * * Copyright (C) 2012 Marvell International Ltd. * Haojian Zhuang <haojian.zhuang@marvell.com> * Joseph(Yossi) Hanin <yhanin@marvell.com> * Qiao Zhou <zhouqiao@marvell.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/i2c.h> #include <linux/mfd/88pm80x.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/err.h> /* 88pm80x chips have same definition for chip id register. */ #define PM80X_CHIP_ID (0x00) #define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7) #define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F) struct pm80x_chip_mapping { unsigned int id; int type; }; static struct pm80x_chip_mapping chip_mapping[] = { /* 88PM800 chip id number */ {0x3, CHIP_PM800}, /* 88PM805 chip id number */ {0x0, CHIP_PM805}, }; /* * workaround: some registers needed by pm805 are defined in pm800, so * need to use this global variable to maintain the relation between * pm800 and pm805. would remove it after HW chip fixes the issue. */ static struct pm80x_chip *g_pm80x_chip; const struct regmap_config pm80x_regmap_config = { .reg_bits = 8, .val_bits = 8, }; EXPORT_SYMBOL_GPL(pm80x_regmap_config); int pm80x_init(struct i2c_client *client) { struct pm80x_chip *chip; struct regmap *map; unsigned int val; int i, ret = 0; chip = devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL); if (!chip) return -ENOMEM; map = devm_regmap_init_i2c(client, &pm80x_regmap_config); if (IS_ERR(map)) { ret = PTR_ERR(map); dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); return ret; } chip->client = client; chip->regmap = map; chip->irq = client->irq; chip->dev = &client->dev; dev_set_drvdata(chip->dev, chip); i2c_set_clientdata(chip->client, chip); ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val); if (ret < 0) { dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret); return ret; } for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) { if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) { chip->type = chip_mapping[i].type; break; } } if (i == ARRAY_SIZE(chip_mapping)) { dev_err(chip->dev, "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val); return -EINVAL; } device_init_wakeup(&client->dev, 1); /* * workaround: set g_pm80x_chip to the first probed chip. if the * second chip is probed, just point to the companion to each * other so that pm805 can access those specific register. would * remove it after HW chip fixes the issue. */ if (!g_pm80x_chip) g_pm80x_chip = chip; else { chip->companion = g_pm80x_chip->client; g_pm80x_chip->companion = chip->client; } return 0; } EXPORT_SYMBOL_GPL(pm80x_init); int pm80x_deinit(void) { /* * workaround: clear the dependency between pm800 and pm805. * would remove it after HW chip fixes the issue. */ if (g_pm80x_chip->companion) g_pm80x_chip->companion = NULL; else g_pm80x_chip = NULL; return 0; } EXPORT_SYMBOL_GPL(pm80x_deinit); #ifdef CONFIG_PM_SLEEP static int pm80x_suspend(struct device *dev) { struct i2c_client *client = container_of(dev, struct i2c_client, dev); struct pm80x_chip *chip = i2c_get_clientdata(client); if (chip && chip->wu_flag) if (device_may_wakeup(chip->dev)) enable_irq_wake(chip->irq); return 0; } static int pm80x_resume(struct device *dev) { struct i2c_client *client = container_of(dev, struct i2c_client, dev); struct pm80x_chip *chip = i2c_get_clientdata(client); if (chip && chip->wu_flag) if (device_may_wakeup(chip->dev)) disable_irq_wake(chip->irq); return 0; } #endif SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); EXPORT_SYMBOL_GPL(pm80x_pm_ops); MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x"); MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); MODULE_LICENSE("GPL");