[linux-2.6-block.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>

/* RtcCtrl bits */
#define AB8500_ALARM_MIN_LOW  0x08
#define AB8500_ALARM_MIN_MID 0x09
#define RTC_CTRL 0x0B
#define RTC_ALARM_ENABLE 0x4

static struct device *sysctrl_dev;

static void ab8500_power_off(void)
{
	sigset_t old;
	sigset_t all;
	static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
	int i;
	bool charger_present = false;
	union power_supply_propval val;
	struct power_supply *psy;
	int ret;

	if (sysctrl_dev == NULL) {
		pr_err("%s: sysctrl not initialized\n", __func__);
		return;
	}

	/*
	 * 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 = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
				&val);
		power_supply_put(psy);

		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 = power_supply_get_property(psy,
				POWER_SUPPLY_PROP_TECHNOLOGY, &val);
		if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
			pr_info("Charger '%s' is connected with known battery",
				pss[i]);
			pr_info(" - Rebooting.\n");
			machine_restart("charging");
		}
		power_supply_put(psy);
	}

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 -EINVAL;

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

	return abx500_get_register_interruptible(sysctrl_dev, bank,
		(u8)(reg & 0xFF), value);
}
EXPORT_SYMBOL(ab8500_sysctrl_read);

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

	if (sysctrl_dev == NULL)
		return -EINVAL;

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

	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
		(u8)(reg & 0xFF), mask, value);
}
EXPORT_SYMBOL(ab8500_sysctrl_write);

static int ab8500_sysctrl_probe(struct platform_device *pdev)
{
	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	struct ab8500_platform_data *plat;
	struct ab8500_sysctrl_platform_data *pdata;

	plat = dev_get_platdata(pdev->dev.parent);

	if (!plat)
		return -EINVAL;

	sysctrl_dev = &pdev->dev;

	if (!pm_power_off)
		pm_power_off = ab8500_power_off;

	pdata = plat->sysctrl;
	if (pdata) {
		int last, ret, i, j;

		if (is_ab8505(ab8500))
			last = AB8500_SYSCLKREQ4RFCLKBUF;
		else
			last = AB8500_SYSCLKREQ8RFCLKBUF;

		for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
			j = i - AB8500_SYSCLKREQ1RFCLKBUF;
			ret = ab8500_sysctrl_write(i, 0xff,
					pdata->initial_req_buf_config[j]);
			dev_dbg(&pdev->dev,
					"Setting SysClkReq%dRfClkBuf 0x%X\n",
					j + 1,
					pdata->initial_req_buf_config[j]);
			if (ret < 0) {
				dev_err(&pdev->dev,
					"Can't set sysClkReq%dRfClkBuf: %d\n",
					j + 1, ret);
			}
		}
	}

	return 0;
}

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

	if (pm_power_off == ab8500_power_off)
		pm_power_off = NULL;

	return 0;
}

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

static int __init ab8500_sysctrl_init(void)
{
	return platform_driver_register(&ab8500_sysctrl_driver);
}
arch_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	17
75932094 LJ	18	/* RtcCtrl bits */
	19	#define AB8500_ALARM_MIN_LOW 0x08
	20	#define AB8500_ALARM_MIN_MID 0x09
	21	#define RTC_CTRL 0x0B
	22	#define RTC_ALARM_ENABLE 0x4
	23
90550d19 MN	24	static struct device *sysctrl_dev;
90550d19 MN	25
3d2088a1	26	static void ab8500_power_off(void)
379749c4 LJ	27	{
	28	sigset_t old;
	29	sigset_t all;
63b4fd75	30	static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
7c34d7c2	31	int i;
0903940d JA	32	bool charger_present = false;
	33	union power_supply_propval val;
	34	struct power_supply *psy;
	35	int ret;
7c34d7c2	36
2377e52f MD	37	if (sysctrl_dev == NULL) {
	38	pr_err("%s: sysctrl not initialized\n", __func__);
	39	return;
	40	}
	41
7c34d7c2 JA	42	/*
	43	* If we have a charger connected and we're powering off,
	44	* reboot into charge-only mode.
	45	*/
	46
	47	for (i = 0; i < ARRAY_SIZE(pss); i++) {
7c34d7c2 JA	48	psy = power_supply_get_by_name(pss[i]);
	49	if (!psy)
	50	continue;
0903940d	51
091e73a2 KK	52	ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
091e73a2 KK	53	&val);
6ff9d25b	54	power_supply_put(psy);
7c34d7c2 JA	55
7c34d7c2 JA	56	if (!ret && val.intval) {
0903940d JA	57	charger_present = true;
	58	break;
	59	}
	60	}
	61
	62	if (!charger_present)
	63	goto shutdown;
	64
	65	/* Check if battery is known */
	66	psy = power_supply_get_by_name("ab8500_btemp");
	67	if (psy) {
091e73a2 KK	68	ret = power_supply_get_property(psy,
091e73a2 KK	69	POWER_SUPPLY_PROP_TECHNOLOGY, &val);
0903940d	70	if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
63b4fd75 LJ	71	pr_info("Charger '%s' is connected with known battery",
	72	pss[i]);
	73	pr_info(" - Rebooting.\n");
5a4bac6e	74	machine_restart("charging");
7c34d7c2	75	}
6ff9d25b	76	power_supply_put(psy);
7c34d7c2	77	}
379749c4	78
0903940d	79	shutdown:
379749c4 LJ	80	sigfillset(&all);
	81
	82	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	83	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	84	AB8500_STW4500CTRL1_SWOFF \|
	85	AB8500_STW4500CTRL1_SWRESET4500N);
	86	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	87	}
	88	}
	89
90550d19 MN	90	static inline bool valid_bank(u8 bank)
	91	{
	92	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	93	(bank == AB8500_SYS_CTRL2_BLOCK));
	94	}
	95
	96	int ab8500_sysctrl_read(u16 reg, u8 *value)
	97	{
	98	u8 bank;
	99
	100	if (sysctrl_dev == NULL)
2377e52f	101	return -EINVAL;
90550d19 MN	102
	103	bank = (reg >> 8);
	104	if (!valid_bank(bank))
	105	return -EINVAL;
	106
	107	return abx500_get_register_interruptible(sysctrl_dev, bank,
	108	(u8)(reg & 0xFF), value);
	109	}
c73db9f7	110	EXPORT_SYMBOL(ab8500_sysctrl_read);
90550d19 MN	111
	112	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	113	{
	114	u8 bank;
	115
	116	if (sysctrl_dev == NULL)
2377e52f	117	return -EINVAL;
90550d19 MN	118
	119	bank = (reg >> 8);
	120	if (!valid_bank(bank))
	121	return -EINVAL;
	122
	123	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	124	(u8)(reg & 0xFF), mask, value);
	125	}
c73db9f7	126	EXPORT_SYMBOL(ab8500_sysctrl_write);
90550d19	127
f791be49	128	static int ab8500_sysctrl_probe(struct platform_device *pdev)
90550d19	129	{
c5535522	130	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
379749c4	131	struct ab8500_platform_data *plat;
1abf063f	132	struct ab8500_sysctrl_platform_data *pdata;
379749c4	133
379749c4	134	plat = dev_get_platdata(pdev->dev.parent);
2377e52f	135
5649d8f9	136	if (!plat)
2377e52f MD	137	return -EINVAL;
2377e52f MD	138
9f7af61a FB	139	sysctrl_dev = &pdev->dev;
9f7af61a FB	140
0b8ebdb1	141	if (!pm_power_off)
379749c4	142	pm_power_off = ab8500_power_off;
1abf063f KW	143
1abf063f KW	144	pdata = plat->sysctrl;
c5535522 RV	145	if (pdata) {
	146	int last, ret, i, j;
	147
	148	if (is_ab8505(ab8500))
	149	last = AB8500_SYSCLKREQ4RFCLKBUF;
	150	else
	151	last = AB8500_SYSCLKREQ8RFCLKBUF;
	152
	153	for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
	154	j = i - AB8500_SYSCLKREQ1RFCLKBUF;
	155	ret = ab8500_sysctrl_write(i, 0xff,
	156	pdata->initial_req_buf_config[j]);
	157	dev_dbg(&pdev->dev,
	158	"Setting SysClkReq%dRfClkBuf 0x%X\n",
	159	j + 1,
	160	pdata->initial_req_buf_config[j]);
	161	if (ret < 0) {
	162	dev_err(&pdev->dev,
63b4fd75 LJ	163	"Can't set sysClkReq%dRfClkBuf: %d\n",
63b4fd75 LJ	164	j + 1, ret);
c5535522	165	}
1abf063f KW	166	}
	167	}
	168
90550d19 MN	169	return 0;
	170	}
	171
4740f73f	172	static int ab8500_sysctrl_remove(struct platform_device *pdev)
90550d19 MN	173	{
90550d19 MN	174	sysctrl_dev = NULL;
0b8ebdb1 FB	175
	176	if (pm_power_off == ab8500_power_off)
	177	pm_power_off = NULL;
	178
90550d19 MN	179	return 0;
	180	}
	181
	182	static struct platform_driver ab8500_sysctrl_driver = {
	183	.driver = {
	184	.name = "ab8500-sysctrl",
90550d19 MN	185	},
90550d19 MN	186	.probe = ab8500_sysctrl_probe,
84449216	187	.remove = ab8500_sysctrl_remove,
90550d19 MN	188	};
	189
	190	static int __init ab8500_sysctrl_init(void)
	191	{
	192	return platform_driver_register(&ab8500_sysctrl_driver);
	193	}
caa62d64	194	arch_initcall(ab8500_sysctrl_init);
90550d19 MN	195
	196	MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
	197	MODULE_DESCRIPTION("AB8500 system control driver");
	198	MODULE_LICENSE("GPL v2");