diff options
Diffstat (limited to 'drivers/mfd/88pm80x.c')
| -rw-r--r-- | drivers/mfd/88pm80x.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/mfd/88pm80x.c b/drivers/mfd/88pm80x.c new file mode 100644 index 000000000000..cd0bf527d764 --- /dev/null +++ b/drivers/mfd/88pm80x.c @@ -0,0 +1,145 @@ +/* + * 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> + +/* + * 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 __devinit pm80x_init(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pm80x_chip *chip; + struct regmap *map; + int 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); + goto err_regmap_init; + } + + chip->id = id->driver_data; + if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805) { + ret = -EINVAL; + goto err_chip_id; + } + + 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); + + 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; + +err_chip_id: + regmap_exit(map); +err_regmap_init: + devm_kfree(&client->dev, chip); + return ret; +} +EXPORT_SYMBOL_GPL(pm80x_init); + +int pm80x_deinit(struct i2c_client *client) +{ + struct pm80x_chip *chip = i2c_get_clientdata(client); + + /* + * 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; + + regmap_exit(chip->regmap); + devm_kfree(&client->dev, chip); + + 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"); |