[mirror_ubuntu-zesty-kernel.git] / drivers / mfd / ab8500-sysctrl.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> 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;
	bool charger_present = false;
	union power_supply_propval val;
	struct power_supply *psy;
	int ret;

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

	for (i = 0; i < ARRAY_SIZE(pss); i++) {
		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) {
			charger_present = true;
			break;
		}
	}

	if (!charger_present)
		goto shutdown;

	/* Check if battery is known */
	psy = power_supply_get_by_name("ab8500_btemp");
	if (psy) {
		ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
					&val);
		if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
			printk(KERN_INFO
			       "Charger \"%s\" is connected with known battery."
			       " Rebooting.\n",
			       pss[i]);
			machine_restart("charging");
		}
	}

shutdown:
	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 <mattias.i.nilsson@stericsson.com");
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 <mattias.i.nilsson@stericsson.com> 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"};
7c34d7c2 JA	25	int i;
0903940d JA	26	bool charger_present = false;
	27	union power_supply_propval val;
	28	struct power_supply *psy;
	29	int ret;
7c34d7c2 JA	30
	31	/*
	32	* If we have a charger connected and we're powering off,
	33	* reboot into charge-only mode.
	34	*/
	35
	36	for (i = 0; i < ARRAY_SIZE(pss); i++) {
7c34d7c2 JA	37	psy = power_supply_get_by_name(pss[i]);
	38	if (!psy)
	39	continue;
0903940d	40
7c34d7c2 JA	41	ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
	42
	43	if (!ret && val.intval) {
0903940d JA	44	charger_present = true;
	45	break;
	46	}
	47	}
	48
	49	if (!charger_present)
	50	goto shutdown;
	51
	52	/* Check if battery is known */
	53	psy = power_supply_get_by_name("ab8500_btemp");
	54	if (psy) {
	55	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
	56	&val);
	57	if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
7c34d7c2	58	printk(KERN_INFO
0903940d JA	59	"Charger \"%s\" is connected with known battery."
0903940d JA	60	" Rebooting.\n",
7c34d7c2	61	pss[i]);
5a4bac6e	62	machine_restart("charging");
7c34d7c2 JA	63	}
7c34d7c2 JA	64	}
379749c4	65
0903940d	66	shutdown:
379749c4 LJ	67	sigfillset(&all);
	68
	69	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	70	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	71	AB8500_STW4500CTRL1_SWOFF \|
	72	AB8500_STW4500CTRL1_SWRESET4500N);
	73	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	74	}
	75	}
	76
90550d19 MN	77	static inline bool valid_bank(u8 bank)
	78	{
	79	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	80	(bank == AB8500_SYS_CTRL2_BLOCK));
	81	}
	82
	83	int ab8500_sysctrl_read(u16 reg, u8 *value)
	84	{
	85	u8 bank;
	86
	87	if (sysctrl_dev == NULL)
	88	return -EAGAIN;
	89
	90	bank = (reg >> 8);
	91	if (!valid_bank(bank))
	92	return -EINVAL;
	93
	94	return abx500_get_register_interruptible(sysctrl_dev, bank,
	95	(u8)(reg & 0xFF), value);
	96	}
	97
	98	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	99	{
	100	u8 bank;
	101
	102	if (sysctrl_dev == NULL)
	103	return -EAGAIN;
	104
	105	bank = (reg >> 8);
	106	if (!valid_bank(bank))
	107	return -EINVAL;
	108
	109	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	110	(u8)(reg & 0xFF), mask, value);
	111	}
	112
f791be49	113	static int ab8500_sysctrl_probe(struct platform_device *pdev)
90550d19	114	{
379749c4 LJ	115	struct ab8500_platform_data *plat;
379749c4 LJ	116
90550d19	117	sysctrl_dev = &pdev->dev;
379749c4 LJ	118	plat = dev_get_platdata(pdev->dev.parent);
	119	if (plat->pm_power_off)
	120	pm_power_off = ab8500_power_off;
90550d19 MN	121	return 0;
	122	}
	123
4740f73f	124	static int ab8500_sysctrl_remove(struct platform_device *pdev)
90550d19 MN	125	{
	126	sysctrl_dev = NULL;
	127	return 0;
	128	}
	129
	130	static struct platform_driver ab8500_sysctrl_driver = {
	131	.driver = {
	132	.name = "ab8500-sysctrl",
	133	.owner = THIS_MODULE,
	134	},
	135	.probe = ab8500_sysctrl_probe,
84449216	136	.remove = ab8500_sysctrl_remove,
90550d19 MN	137	};
	138
	139	static int __init ab8500_sysctrl_init(void)
	140	{
	141	return platform_driver_register(&ab8500_sysctrl_driver);
	142	}
	143	subsys_initcall(ab8500_sysctrl_init);
	144
	145	MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
	146	MODULE_DESCRIPTION("AB8500 system control driver");
	147	MODULE_LICENSE("GPL v2");