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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170// SPDX-License-Identifier: GPL-2.0-only/* * AB8500 system control driver * * Copyright (C) ST-Ericsson SA 2010 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. */
#include <linux/err.h>#include <linux/init.h>#include <linux/export.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", "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 -EPROBE_DEFER;
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 -EPROBE_DEFER;
bank = (reg >> 8); if (!valid_bank(bank)) { pr_err("invalid bank\n"); 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){ sysctrl_dev = &pdev->dev;
if (!pm_power_off) pm_power_off = ab8500_power_off;
return 0;}
static void ab8500_sysctrl_remove(struct platform_device *pdev){ sysctrl_dev = NULL;
if (pm_power_off == ab8500_power_off) pm_power_off = NULL;}
static const struct of_device_id ab8500_sysctrl_match[] = { { .compatible = "stericsson,ab8500-sysctrl", }, {}};
static struct platform_driver ab8500_sysctrl_driver = { .driver = { .name = "ab8500-sysctrl", .of_match_table = ab8500_sysctrl_match, }, .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);