[mirror_ubuntu-jammy-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", "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 = 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 -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_platform_data *plat;
	struct ab8500_sysctrl_platform_data *pdata;
	int ret, i, j;

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

	if (!(plat && plat->sysctrl))
		return -EINVAL;

	if (plat->pm_power_off)
		pm_power_off = ab8500_power_off;

	pdata = plat->sysctrl;


	for (i = AB8500_SYSCLKREQ1RFCLKBUF;
	     i <= AB8500_SYSCLKREQ8RFCLKBUF; 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,
				"unable to set sysClkReq%dRfClkBuf: "
				"%d\n", j + 1, ret);
		}
	}

	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;
f04a9d8a	24	static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
7c34d7c2	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	30
2377e52f MD	31	if (sysctrl_dev == NULL) {
	32	pr_err("%s: sysctrl not initialized\n", __func__);
	33	return;
	34	}
	35
7c34d7c2 JA	36	/*
	37	* If we have a charger connected and we're powering off,
	38	* reboot into charge-only mode.
	39	*/
	40
	41	for (i = 0; i < ARRAY_SIZE(pss); i++) {
7c34d7c2 JA	42	psy = power_supply_get_by_name(pss[i]);
	43	if (!psy)
	44	continue;
0903940d	45
7c34d7c2 JA	46	ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
	47
	48	if (!ret && val.intval) {
0903940d JA	49	charger_present = true;
	50	break;
	51	}
	52	}
	53
	54	if (!charger_present)
	55	goto shutdown;
	56
	57	/* Check if battery is known */
	58	psy = power_supply_get_by_name("ab8500_btemp");
	59	if (psy) {
	60	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
	61	&val);
	62	if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
7c34d7c2	63	printk(KERN_INFO
0903940d JA	64	"Charger \"%s\" is connected with known battery."
0903940d JA	65	" Rebooting.\n",
7c34d7c2	66	pss[i]);
5a4bac6e	67	machine_restart("charging");
7c34d7c2 JA	68	}
7c34d7c2 JA	69	}
379749c4	70
0903940d	71	shutdown:
379749c4 LJ	72	sigfillset(&all);
	73
	74	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	75	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	76	AB8500_STW4500CTRL1_SWOFF \|
	77	AB8500_STW4500CTRL1_SWRESET4500N);
	78	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	79	}
	80	}
	81
90550d19 MN	82	static inline bool valid_bank(u8 bank)
	83	{
	84	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	85	(bank == AB8500_SYS_CTRL2_BLOCK));
	86	}
	87
	88	int ab8500_sysctrl_read(u16 reg, u8 *value)
	89	{
	90	u8 bank;
	91
	92	if (sysctrl_dev == NULL)
2377e52f	93	return -EINVAL;
90550d19 MN	94
	95	bank = (reg >> 8);
	96	if (!valid_bank(bank))
	97	return -EINVAL;
	98
	99	return abx500_get_register_interruptible(sysctrl_dev, bank,
	100	(u8)(reg & 0xFF), value);
	101	}
c73db9f7	102	EXPORT_SYMBOL(ab8500_sysctrl_read);
90550d19 MN	103
	104	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	105	{
	106	u8 bank;
	107
	108	if (sysctrl_dev == NULL)
2377e52f	109	return -EINVAL;
90550d19 MN	110
	111	bank = (reg >> 8);
	112	if (!valid_bank(bank))
	113	return -EINVAL;
	114
	115	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	116	(u8)(reg & 0xFF), mask, value);
	117	}
c73db9f7	118	EXPORT_SYMBOL(ab8500_sysctrl_write);
90550d19	119
f791be49	120	static int ab8500_sysctrl_probe(struct platform_device *pdev)
90550d19	121	{
379749c4	122	struct ab8500_platform_data *plat;
1abf063f	123	struct ab8500_sysctrl_platform_data *pdata;
2377e52f	124	int ret, i, j;
379749c4	125
379749c4	126	plat = dev_get_platdata(pdev->dev.parent);
2377e52f MD	127
	128	if (!(plat && plat->sysctrl))
	129	return -EINVAL;
	130
379749c4 LJ	131	if (plat->pm_power_off)
379749c4 LJ	132	pm_power_off = ab8500_power_off;
1abf063f KW	133
	134	pdata = plat->sysctrl;
	135
1abf063f	136
2377e52f MD	137	for (i = AB8500_SYSCLKREQ1RFCLKBUF;
	138	i <= AB8500_SYSCLKREQ8RFCLKBUF; i++) {
	139	j = i - AB8500_SYSCLKREQ1RFCLKBUF;
	140	ret = ab8500_sysctrl_write(i, 0xff,
	141	pdata->initial_req_buf_config[j]);
	142	dev_dbg(&pdev->dev,
1abf063f KW	143	"Setting SysClkReq%dRfClkBuf 0x%X\n",
	144	j + 1,
	145	pdata->initial_req_buf_config[j]);
2377e52f MD	146	if (ret < 0) {
	147	dev_err(&pdev->dev,
	148	"unable to set sysClkReq%dRfClkBuf: "
	149	"%d\n", j + 1, ret);
1abf063f KW	150	}
	151	}
	152
90550d19 MN	153	return 0;
	154	}
	155
4740f73f	156	static int ab8500_sysctrl_remove(struct platform_device *pdev)
90550d19 MN	157	{
	158	sysctrl_dev = NULL;
	159	return 0;
	160	}
	161
	162	static struct platform_driver ab8500_sysctrl_driver = {
	163	.driver = {
	164	.name = "ab8500-sysctrl",
	165	.owner = THIS_MODULE,
	166	},
	167	.probe = ab8500_sysctrl_probe,
84449216	168	.remove = ab8500_sysctrl_remove,
90550d19 MN	169	};
	170
	171	static int __init ab8500_sysctrl_init(void)
	172	{
	173	return platform_driver_register(&ab8500_sysctrl_driver);
	174	}
	175	subsys_initcall(ab8500_sysctrl_init);
	176
	177	MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
	178	MODULE_DESCRIPTION("AB8500 system control driver");
	179	MODULE_LICENSE("GPL v2");