/* * 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 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);	}} /* * Use the AB WD to reset the platform. It will perform a hard * reset instead of a soft reset. Write the reset reason to * the AB before reset, which can be read upon restart. */void ab8500_restart(char mode, const char *cmd){	struct ab8500_platform_data *plat;	struct ab8500_sysctrl_platform_data *pdata;	u16 reason = 0;	u8 val; 	if (sysctrl_dev == NULL) {		pr_err("%s: sysctrl not initialized\n", __func__);		return;	} 	plat = dev_get_platdata(sysctrl_dev->parent);	pdata = plat->sysctrl;	if (pdata && pdata->reboot_reason_code)		reason = pdata->reboot_reason_code(cmd);	else		pr_warn("[%s] No reboot reason set. Default reason %d\n",			__func__, reason); 	/*	 * Disable RTC alarm, just a precaution so that no alarm	 * is running when WD reset is executed.	 */	abx500_get_register_interruptible(sysctrl_dev, AB8500_RTC,		RTC_CTRL , &val);	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,		RTC_CTRL , (val & ~RTC_ALARM_ENABLE)); 	/*	 * Android is not using the RTC alarm registers during reboot	 * so we borrow them for writing the reason of reset	 */ 	/* reason[8 LSB] */	val = reason & 0xFF;	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,		AB8500_ALARM_MIN_LOW , val); 	/* reason[8 MSB] */	val = (reason>>8) & 0xFF;	abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,		AB8500_ALARM_MIN_MID , val); 	/* Setting WD timeout to 0 */	ab8500_sysctrl_write(AB8500_MAINWDOGTIMER, 0xFF, 0x0); 	/* Setting the parameters to AB8500 WD*/	ab8500_sysctrl_write(AB8500_MAINWDOGCTRL, 0xFF, (AB8500_ENABLE_WD |		AB8500_WD_RESTART_ON_EXPIRE | AB8500_KICK_WD));} 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,					"unable to 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",		.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);}arch_initcall(ab8500_sysctrl_init); MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");MODULE_DESCRIPTION("AB8500 system control driver");MODULE_LICENSE("GPL v2");