172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AB8500 system control driver
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*
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* Copyright (C) ST-Ericsson SA 2010
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* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/reboot.h>
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#include <linux/signal.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/abx500/ab8500.h>
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#include <linux/mfd/abx500/ab8500-sysctrl.h>
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/* RtcCtrl bits */
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#define AB8500_ALARM_MIN_LOW 0x08
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#define AB8500_ALARM_MIN_MID 0x09
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#define RTC_CTRL 0x0B
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#define RTC_ALARM_ENABLE 0x4
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static struct device *sysctrl_dev;
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static void ab8500_power_off(void)
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{
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sigset_t old;
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sigset_t all;
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static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
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int i;
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bool charger_present = false;
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union power_supply_propval val;
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struct power_supply *psy;
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int ret;
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if (sysctrl_dev == NULL) {
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pr_err("%s: sysctrl not initialized\n", __func__);
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return;
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}
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/*
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* If we have a charger connected and we're powering off,
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* reboot into charge-only mode.
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*/
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for (i = 0; i < ARRAY_SIZE(pss); i++) {
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psy = power_supply_get_by_name(pss[i]);
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if (!psy)
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continue;
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ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
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&val);
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power_supply_put(psy);
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if (!ret && val.intval) {
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charger_present = true;
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break;
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}
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}
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if (!charger_present)
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goto shutdown;
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/* Check if battery is known */
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psy = power_supply_get_by_name("ab8500_btemp");
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if (psy) {
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ret = power_supply_get_property(psy,
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POWER_SUPPLY_PROP_TECHNOLOGY, &val);
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if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
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pr_info("Charger '%s' is connected with known battery",
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pss[i]);
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pr_info(" - Rebooting.\n");
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machine_restart("charging");
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}
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power_supply_put(psy);
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}
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shutdown:
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sigfillset(&all);
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if (!sigprocmask(SIG_BLOCK, &all, &old)) {
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(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
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AB8500_STW4500CTRL1_SWOFF |
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AB8500_STW4500CTRL1_SWRESET4500N);
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(void)sigprocmask(SIG_SETMASK, &old, NULL);
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}
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}
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static inline bool valid_bank(u8 bank)
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{
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return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
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(bank == AB8500_SYS_CTRL2_BLOCK));
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}
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int ab8500_sysctrl_read(u16 reg, u8 *value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EPROBE_DEFER;
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bank = (reg >> 8);
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if (!valid_bank(bank))
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return -EINVAL;
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return abx500_get_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), value);
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}
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EXPORT_SYMBOL(ab8500_sysctrl_read);
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int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EPROBE_DEFER;
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bank = (reg >> 8);
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if (!valid_bank(bank)) {
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pr_err("invalid bank\n");
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return -EINVAL;
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}
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return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), mask, value);
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}
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EXPORT_SYMBOL(ab8500_sysctrl_write);
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static int ab8500_sysctrl_probe(struct platform_device *pdev)
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{
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sysctrl_dev = &pdev->dev;
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if (!pm_power_off)
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pm_power_off = ab8500_power_off;
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return 0;
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}
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static int ab8500_sysctrl_remove(struct platform_device *pdev)
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{
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sysctrl_dev = NULL;
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if (pm_power_off == ab8500_power_off)
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pm_power_off = NULL;
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return 0;
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}
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static const struct of_device_id ab8500_sysctrl_match[] = {
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{ .compatible = "stericsson,ab8500-sysctrl", },
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{}
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};
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static struct platform_driver ab8500_sysctrl_driver = {
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.driver = {
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.name = "ab8500-sysctrl",
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.of_match_table = ab8500_sysctrl_match,
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},
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.probe = ab8500_sysctrl_probe,
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.remove = ab8500_sysctrl_remove,
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};
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static int __init ab8500_sysctrl_init(void)
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{
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return platform_driver_register(&ab8500_sysctrl_driver);
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}
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arch_initcall(ab8500_sysctrl_init);
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