[linux.git] / drivers / mfd / ab8500-sysctrl.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 * Author: Mattias Nilsson <[email protected]> for ST Ericsson.
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/reboot.h>
#include <linux/signal.h>
#include <linux/power_supply.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-sysctrl.h>

static struct device *sysctrl_dev;

void ab8500_power_off(void)
{
	sigset_t old;
	sigset_t all;
	static char *pss[] = {"ab8500_ac", "ab8500_usb"};
	int i;

	/*
	 * If we have a charger connected and we're powering off,
	 * reboot into charge-only mode.
	 */

	for (i = 0; i < ARRAY_SIZE(pss); i++) {
		union power_supply_propval val;
		struct power_supply *psy;
		int ret;

		psy = power_supply_get_by_name(pss[i]);
		if (!psy)
			continue;
		ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);

		if (!ret && val.intval) {
			printk(KERN_INFO
			       "Charger \"%s\" is connected. Rebooting.\n",
			       pss[i]);
			machine_restart(NULL);
		}
	}

	sigfillset(&all);

	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
					 AB8500_STW4500CTRL1_SWOFF |
					 AB8500_STW4500CTRL1_SWRESET4500N);
		(void)sigprocmask(SIG_SETMASK, &old, NULL);
	}
}

static inline bool valid_bank(u8 bank)
{
	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
		(bank == AB8500_SYS_CTRL2_BLOCK));
}

int ab8500_sysctrl_read(u16 reg, u8 *value)
{
	u8 bank;

	if (sysctrl_dev == NULL)
		return -EAGAIN;

	bank = (reg >> 8);
	if (!valid_bank(bank))
		return -EINVAL;

	return abx500_get_register_interruptible(sysctrl_dev, bank,
		(u8)(reg & 0xFF), value);
}

int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
{
	u8 bank;

	if (sysctrl_dev == NULL)
		return -EAGAIN;

	bank = (reg >> 8);
	if (!valid_bank(bank))
		return -EINVAL;

	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
		(u8)(reg & 0xFF), mask, value);
}

static int ab8500_sysctrl_probe(struct platform_device *pdev)
{
	struct ab8500_platform_data *plat;

	sysctrl_dev = &pdev->dev;
	plat = dev_get_platdata(pdev->dev.parent);
	if (plat->pm_power_off)
		pm_power_off = ab8500_power_off;
	return 0;
}

static int ab8500_sysctrl_remove(struct platform_device *pdev)
{
	sysctrl_dev = NULL;
	return 0;
}

static struct platform_driver ab8500_sysctrl_driver = {
	.driver = {
		.name = "ab8500-sysctrl",
		.owner = THIS_MODULE,
	},
	.probe = ab8500_sysctrl_probe,
	.remove = ab8500_sysctrl_remove,
};

static int __init ab8500_sysctrl_init(void)
{
	return platform_driver_register(&ab8500_sysctrl_driver);
}
subsys_initcall(ab8500_sysctrl_init);

MODULE_AUTHOR("Mattias Nilsson <[email protected]");
MODULE_DESCRIPTION("AB8500 system control driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
90550d19 MN	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	* Author: Mattias Nilsson <[email protected]> for ST Ericsson.
	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
	7	#include <linux/err.h>
4e36dd33	8	#include <linux/module.h>
90550d19	9	#include <linux/platform_device.h>
379749c4	10	#include <linux/pm.h>
7c34d7c2	11	#include <linux/reboot.h>
379749c4	12	#include <linux/signal.h>
7c34d7c2	13	#include <linux/power_supply.h>
90550d19	14	#include <linux/mfd/abx500.h>
ee66e653 LW	15	#include <linux/mfd/abx500/ab8500.h>
ee66e653 LW	16	#include <linux/mfd/abx500/ab8500-sysctrl.h>
90550d19 MN	17
	18	static struct device *sysctrl_dev;
	19
379749c4 LJ	20	void ab8500_power_off(void)
	21	{
	22	sigset_t old;
	23	sigset_t all;
7c34d7c2 JA	24	static char *pss[] = {"ab8500_ac", "ab8500_usb"};
	25	int i;
	26
	27	/*
	28	* If we have a charger connected and we're powering off,
	29	* reboot into charge-only mode.
	30	*/
	31
	32	for (i = 0; i < ARRAY_SIZE(pss); i++) {
	33	union power_supply_propval val;
	34	struct power_supply *psy;
	35	int ret;
	36
	37	psy = power_supply_get_by_name(pss[i]);
	38	if (!psy)
	39	continue;
	40	ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
	41
	42	if (!ret && val.intval) {
	43	printk(KERN_INFO
	44	"Charger \"%s\" is connected. Rebooting.\n",
	45	pss[i]);
	46	machine_restart(NULL);
	47	}
	48	}
379749c4 LJ	49
	50	sigfillset(&all);
	51
	52	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	53	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	54	AB8500_STW4500CTRL1_SWOFF \|
	55	AB8500_STW4500CTRL1_SWRESET4500N);
	56	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	57	}
	58	}
	59
90550d19 MN	60	static inline bool valid_bank(u8 bank)
	61	{
	62	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	63	(bank == AB8500_SYS_CTRL2_BLOCK));
	64	}
	65
	66	int ab8500_sysctrl_read(u16 reg, u8 *value)
	67	{
	68	u8 bank;
	69
	70	if (sysctrl_dev == NULL)
	71	return -EAGAIN;
	72
	73	bank = (reg >> 8);
	74	if (!valid_bank(bank))
	75	return -EINVAL;
	76
	77	return abx500_get_register_interruptible(sysctrl_dev, bank,
	78	(u8)(reg & 0xFF), value);
	79	}
	80
	81	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	82	{
	83	u8 bank;
	84
	85	if (sysctrl_dev == NULL)
	86	return -EAGAIN;
	87
	88	bank = (reg >> 8);
	89	if (!valid_bank(bank))
	90	return -EINVAL;
	91
	92	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	93	(u8)(reg & 0xFF), mask, value);
	94	}
	95
f791be49	96	static int ab8500_sysctrl_probe(struct platform_device *pdev)
90550d19	97	{
379749c4 LJ	98	struct ab8500_platform_data *plat;
379749c4 LJ	99
90550d19	100	sysctrl_dev = &pdev->dev;
379749c4 LJ	101	plat = dev_get_platdata(pdev->dev.parent);
	102	if (plat->pm_power_off)
	103	pm_power_off = ab8500_power_off;
90550d19 MN	104	return 0;
	105	}
	106
4740f73f	107	static int ab8500_sysctrl_remove(struct platform_device *pdev)
90550d19 MN	108	{
	109	sysctrl_dev = NULL;
	110	return 0;
	111	}
	112
	113	static struct platform_driver ab8500_sysctrl_driver = {
	114	.driver = {
	115	.name = "ab8500-sysctrl",
	116	.owner = THIS_MODULE,
	117	},
	118	.probe = ab8500_sysctrl_probe,
84449216	119	.remove = ab8500_sysctrl_remove,
90550d19 MN	120	};
	121
	122	static int __init ab8500_sysctrl_init(void)
	123	{
	124	return platform_driver_register(&ab8500_sysctrl_driver);
	125	}
	126	subsys_initcall(ab8500_sysctrl_init);
	127
	128	MODULE_AUTHOR("Mattias Nilsson <[email protected]");
	129	MODULE_DESCRIPTION("AB8500 system control driver");
	130	MODULE_LICENSE("GPL v2");