[POWERPC] apm_emu: Use generic apm-emulation (b3028878) · Commits · e / devices / android_kernel_oneplus_sm8150

arch/powerpc/Kconfig

+3 −0

Original line number	Diff line number	Diff line
		@@ -117,6 +117,9 @@ config GENERIC_BUG
		default y
		depends on BUG

		config SYS_SUPPORTS_APM_EMULATION
		bool

		config DEFAULT_UIMAGE
		bool
		help

drivers/macintosh/Kconfig

+3 −1

Original line number	Diff line number	Diff line
		@@ -109,7 +109,9 @@ config PMAC_SMU

		config PMAC_APM_EMU
		tristate "APM emulation"
		depends on PPC_PMAC && PPC32 && PM && ADB_PMU
		select SYS_SUPPORTS_APM_EMULATION
		select APM_EMULATION
		depends on ADB_PMU && PM

		config PMAC_MEDIABAY
		bool "Support PowerBook hotswap media bay"

drivers/macintosh/apm_emu.c

+44 −477

Original line number	Diff line number	Diff line
		/* APM emulation layer for PowerMac
		/*
		* APM emulation for PMU-based machines
		*
		* Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
		*
		* Lots of code inherited from apm.c, see appropriate notice in
		* arch/i386/kernel/apm.c
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the
		* Free Software Foundation; either version 2, or (at your option) any
		@@ -18,429 +16,39 @@
		*
		*/

		#include <linux/module.h>

		#include <linux/poll.h>
		#include <linux/types.h>
		#include <linux/stddef.h>
		#include <linux/timer.h>
		#include <linux/fcntl.h>
		#include <linux/slab.h>
		#include <linux/stat.h>
		#include <linux/proc_fs.h>
		#include <linux/miscdevice.h>
		#include <linux/apm_bios.h>
		#include <linux/init.h>
		#include <linux/sched.h>
		#include <linux/pm.h>
		#include <linux/kernel.h>
		#include <linux/smp_lock.h>

		#include <linux/module.h>
		#include <linux/apm-emulation.h>
		#include <linux/adb.h>
		#include <linux/pmu.h>

		#include <asm/system.h>
		#include <asm/uaccess.h>
		#include <asm/machdep.h>

		#undef DEBUG

		#ifdef DEBUG
		#define DBG(args...) printk(KERN_DEBUG args)
		//#define DBG(args...) xmon_printf(args)
		#else
		#define DBG(args...) do { } while (0)
		#endif

		/*
		* The apm_bios device is one of the misc char devices.
		* This is its minor number.
		*/
		#define APM_MINOR_DEV 134

		/*
		* Maximum number of events stored
		*/
		#define APM_MAX_EVENTS 20

		#define FAKE_APM_BIOS_VERSION 0x0101

		#define APM_USER_NOTIFY_TIMEOUT (5*HZ)

		/*
		* The per-file APM data
		*/
		struct apm_user {
		int magic;
		struct apm_user * next;
		int suser: 1;
		int suspend_waiting: 1;
		int suspends_pending;
		int suspends_read;
		int event_head;
		int event_tail;
		apm_event_t events[APM_MAX_EVENTS];
		};

		/*
		* The magic number in apm_user
		*/
		#define APM_BIOS_MAGIC 0x4101

		/*
		* Local variables
		*/
		static int suspends_pending;

		static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
		static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
		static struct apm_user * user_list;

		static void apm_notify_sleep(struct pmu_sleep_notifier *self, int when);
		static struct pmu_sleep_notifier apm_sleep_notifier = {
		apm_notify_sleep,
		SLEEP_LEVEL_USERLAND,
		};

		static const char driver_version[] = "0.5"; /* no spaces */

		#ifdef DEBUG
		static char * apm_event_name[] = {
		"system standby",
		"system suspend",
		"normal resume",
		"critical resume",
		"low battery",
		"power status change",
		"update time",
		"critical suspend",
		"user standby",
		"user suspend",
		"system standby resume",
		"capabilities change"
		};
		#define NR_APM_EVENT_NAME \
		(sizeof(apm_event_name) / sizeof(apm_event_name[0]))

		#endif

		static int queue_empty(struct apm_user *as)
		{
		return as->event_head == as->event_tail;
		}

		static apm_event_t get_queued_event(struct apm_user *as)
		{
		as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
		return as->events[as->event_tail];
		}

		static void queue_event(apm_event_t event, struct apm_user *sender)
		{
		struct apm_user * as;

		DBG("apm_emu: queue_event(%s)\n", apm_event_name[event-1]);
		if (user_list == NULL)
		return;
		for (as = user_list; as != NULL; as = as->next) {
		if (as == sender)
		continue;
		as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
		if (as->event_head == as->event_tail) {
		static int notified;

		if (notified++ == 0)
		printk(KERN_ERR "apm_emu: an event queue overflowed\n");
		as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
		}
		as->events[as->event_head] = event;
		if (!as->suser)
		continue;
		switch (event) {
		case APM_SYS_SUSPEND:
		case APM_USER_SUSPEND:
		as->suspends_pending++;
		suspends_pending++;
		break;
		case APM_NORMAL_RESUME:
		as->suspend_waiting = 0;
		break;
		}
		}
		wake_up_interruptible(&apm_waitqueue);
		}

		static int check_apm_user(struct apm_user as, const char func)
		{
		if ((as == NULL) \|\| (as->magic != APM_BIOS_MAGIC)) {
		printk(KERN_ERR "apm_emu: %s passed bad filp\n", func);
		return 1;
		}
		return 0;
		}

		static ssize_t do_read(struct file fp, char __user buf, size_t count, loff_t *ppos)
		{
		struct apm_user * as;
		size_t i;
		apm_event_t event;
		DECLARE_WAITQUEUE(wait, current);

		as = fp->private_data;
		if (check_apm_user(as, "read"))
		return -EIO;
		if (count < sizeof(apm_event_t))
		return -EINVAL;
		if (queue_empty(as)) {
		if (fp->f_flags & O_NONBLOCK)
		return -EAGAIN;
		add_wait_queue(&apm_waitqueue, &wait);
		repeat:
		set_current_state(TASK_INTERRUPTIBLE);
		if (queue_empty(as) && !signal_pending(current)) {
		schedule();
		goto repeat;
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&apm_waitqueue, &wait);
		}
		i = count;
		while ((i >= sizeof(event)) && !queue_empty(as)) {
		event = get_queued_event(as);
		DBG("apm_emu: do_read, returning: %s\n", apm_event_name[event-1]);
		if (copy_to_user(buf, &event, sizeof(event))) {
		if (i < count)
		break;
		return -EFAULT;
		}
		switch (event) {
		case APM_SYS_SUSPEND:
		case APM_USER_SUSPEND:
		as->suspends_read++;
		break;
		}
		buf += sizeof(event);
		i -= sizeof(event);
		}
		if (i < count)
		return count - i;
		if (signal_pending(current))
		return -ERESTARTSYS;
		return 0;
		}

		static unsigned int do_poll(struct file fp, poll_table wait)
		{
		struct apm_user * as;

		as = fp->private_data;
		if (check_apm_user(as, "poll"))
		return 0;
		poll_wait(fp, &apm_waitqueue, wait);
		if (!queue_empty(as))
		return POLLIN \| POLLRDNORM;
		return 0;
		}

		static int do_ioctl(struct inode * inode, struct file *filp,
		u_int cmd, u_long arg)
		{
		struct apm_user * as;
		DECLARE_WAITQUEUE(wait, current);

		as = filp->private_data;
		if (check_apm_user(as, "ioctl"))
		return -EIO;
		if (!as->suser)
		return -EPERM;
		switch (cmd) {
		case APM_IOC_SUSPEND:
		/* If a suspend message was sent to userland, we
		* consider this as a confirmation message
		*/
		if (as->suspends_read > 0) {
		as->suspends_read--;
		as->suspends_pending--;
		suspends_pending--;
		} else {
		// Route to PMU suspend ?
		break;
		}
		as->suspend_waiting = 1;
		add_wait_queue(&apm_waitqueue, &wait);
		DBG("apm_emu: ioctl waking up sleep waiter !\n");
		wake_up(&apm_suspend_waitqueue);
		mb();
		while(as->suspend_waiting && !signal_pending(current)) {
		set_current_state(TASK_INTERRUPTIBLE);
		schedule();
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&apm_waitqueue, &wait);
		break;
		default:
		return -EINVAL;
		}
		return 0;
		}

		static int do_release(struct inode * inode, struct file * filp)
		{
		struct apm_user * as;

		as = filp->private_data;
		if (check_apm_user(as, "release"))
		return 0;
		filp->private_data = NULL;
		lock_kernel();
		if (as->suspends_pending > 0) {
		suspends_pending -= as->suspends_pending;
		if (suspends_pending <= 0)
		wake_up(&apm_suspend_waitqueue);
		}
		if (user_list == as)
		user_list = as->next;
		else {
		struct apm_user * as1;

		for (as1 = user_list;
		(as1 != NULL) && (as1->next != as);
		as1 = as1->next)
		;
		if (as1 == NULL)
		printk(KERN_ERR "apm: filp not in user list\n");
		else
		as1->next = as->next;
		}
		unlock_kernel();
		kfree(as);
		return 0;
		}

		static int do_open(struct inode * inode, struct file * filp)
		{
		struct apm_user * as;

		as = kmalloc(sizeof(*as), GFP_KERNEL);
		if (as == NULL) {
		printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
		sizeof(*as));
		return -ENOMEM;
		}
		as->magic = APM_BIOS_MAGIC;
		as->event_tail = as->event_head = 0;
		as->suspends_pending = 0;
		as->suspends_read = 0;
		/*
		* XXX - this is a tiny bit broken, when we consider BSD
		* process accounting. If the device is opened by root, we
		* instantly flag that we used superuser privs. Who knows,
		* we might close the device immediately without doing a
		* privileged operation -- cevans
		*/
		as->suser = capable(CAP_SYS_ADMIN);
		as->next = user_list;
		user_list = as;
		filp->private_data = as;

		DBG("apm_emu: opened by %s, suser: %d\n", current->comm, (int)as->suser);

		return 0;
		}

		/* Wait for all clients to ack the suspend request. APM API
		* doesn't provide a way to NAK, but this could be added
		* here.
		*/
		static void wait_all_suspend(void)
		{
		DECLARE_WAITQUEUE(wait, current);

		add_wait_queue(&apm_suspend_waitqueue, &wait);
		DBG("apm_emu: wait_all_suspend(), suspends_pending: %d\n", suspends_pending);
		while(suspends_pending > 0) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule();
		}
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&apm_suspend_waitqueue, &wait);

		DBG("apm_emu: wait_all_suspend() - complete !\n");
		}

		static void apm_notify_sleep(struct pmu_sleep_notifier *self, int when)
		{
		switch(when) {
		case PBOOK_SLEEP_REQUEST:
		queue_event(APM_SYS_SUSPEND, NULL);
		wait_all_suspend();
		break;
		case PBOOK_WAKE:
		queue_event(APM_NORMAL_RESUME, NULL);
		break;
		}
		}

		#define APM_CRITICAL 10
		#define APM_LOW 30

		static int apm_emu_get_info(char buf, char *start, off_t fpos, int length)
		static void pmu_apm_get_power_status(struct apm_power_info *info)
		{
		/* Arguments, with symbols from linux/apm_bios.h. Information is
		from the Get Power Status (0x0a) call unless otherwise noted.

		0) Linux driver version (this will change if format changes)
		1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
		2) APM flags from APM Installation Check (0x00):
		bit 0: APM_16_BIT_SUPPORT
		bit 1: APM_32_BIT_SUPPORT
		bit 2: APM_IDLE_SLOWS_CLOCK
		bit 3: APM_BIOS_DISABLED
		bit 4: APM_BIOS_DISENGAGED
		3) AC line status
		0x00: Off-line
		0x01: On-line
		0x02: On backup power (BIOS >= 1.1 only)
		0xff: Unknown
		4) Battery status
		0x00: High
		0x01: Low
		0x02: Critical
		0x03: Charging
		0x04: Selected battery not present (BIOS >= 1.2 only)
		0xff: Unknown
		5) Battery flag
		bit 0: High
		bit 1: Low
		bit 2: Critical
		bit 3: Charging
		bit 7: No system battery
		0xff: Unknown
		6) Remaining battery life (percentage of charge):
		0-100: valid
		-1: Unknown
		7) Remaining battery life (time units):
		Number of remaining minutes or seconds
		-1: Unknown
		8) min = minutes; sec = seconds */

		unsigned short ac_line_status;
		unsigned short battery_status = 0;
		unsigned short battery_flag = 0xff;
		int percentage = -1;
		int batteries = 0;
		int time_units = -1;
		int real_count = 0;
		int i;
		char * p = buf;
		char charging = 0;
		long charge = -1;
		long amperage = 0;
		unsigned long btype = 0;

		ac_line_status = ((pmu_power_flags & PMU_PWR_AC_PRESENT) != 0);
		info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
		info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
		info->units = APM_UNITS_MINS;

		if (pmu_power_flags & PMU_PWR_AC_PRESENT)
		info->ac_line_status = APM_AC_ONLINE;
		else
		info->ac_line_status = APM_AC_OFFLINE;

		for (i=0; i<pmu_battery_count; i++) {
		if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
		battery_status++;
		batteries++;
		if (percentage < 0)
		percentage = 0;
		if (charge < 0)
		@@ -456,9 +64,9 @@ static int apm_emu_get_info(char buf, char *start, off_t fpos, int length)
		charging++;
		}
		}
		if (0 == battery_status)
		ac_line_status = 1;
		battery_status = 0xff;
		if (batteries == 0)
		info->ac_line_status = APM_AC_ONLINE;

		if (real_count) {
		if (amperage < 0) {
		if (btype == PMU_BATT_TYPE_SMART)
		@@ -468,85 +76,44 @@ static int apm_emu_get_info(char buf, char *start, off_t fpos, int length)
		}
		percentage /= real_count;
		if (charging > 0) {
		battery_status = 0x03;
		battery_flag = 0x08;
		info->battery_status = APM_BATTERY_STATUS_CHARGING;
		info->battery_flag = APM_BATTERY_FLAG_CHARGING;
		} else if (percentage <= APM_CRITICAL) {
		battery_status = 0x02;
		battery_flag = 0x04;
		info->battery_status = APM_BATTERY_STATUS_CRITICAL;
		info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
		} else if (percentage <= APM_LOW) {
		battery_status = 0x01;
		battery_flag = 0x02;
		info->battery_status = APM_BATTERY_STATUS_LOW;
		info->battery_flag = APM_BATTERY_FLAG_LOW;
		} else {
		battery_status = 0x00;
		battery_flag = 0x01;
		info->battery_status = APM_BATTERY_STATUS_HIGH;
		info->battery_flag = APM_BATTERY_FLAG_HIGH;
		}
		}
		p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
		driver_version,
		(FAKE_APM_BIOS_VERSION >> 8) & 0xff,
		FAKE_APM_BIOS_VERSION & 0xff,
		0,
		ac_line_status,
		battery_status,
		battery_flag,
		percentage,
		time_units,
		"min");

		return p - buf;
		info->battery_life = percentage;
		info->time = time_units;
		}

		static const struct file_operations apm_bios_fops = {
		.owner = THIS_MODULE,
		.read = do_read,
		.poll = do_poll,
		.ioctl = do_ioctl,
		.open = do_open,
		.release = do_release,
		};

		static struct miscdevice apm_device = {
		APM_MINOR_DEV,
		"apm_bios",
		&apm_bios_fops
		};

		static int __init apm_emu_init(void)
		{
		struct proc_dir_entry *apm_proc;

		if (sys_ctrler != SYS_CTRLER_PMU) {
		printk(KERN_INFO "apm_emu: Requires a machine with a PMU.\n");
		return -ENODEV;
		}

		apm_proc = create_proc_info_entry("apm", 0, NULL, apm_emu_get_info);
		if (apm_proc)
		apm_proc->owner = THIS_MODULE;
		apm_get_power_status = pmu_apm_get_power_status;

		if (misc_register(&apm_device) != 0)
		printk(KERN_INFO "Could not create misc. device for apm\n");

		pmu_register_sleep_notifier(&apm_sleep_notifier);

		printk(KERN_INFO "apm_emu: APM Emulation %s initialized.\n", driver_version);
		printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");

		return 0;
		}

		static void __exit apm_emu_exit(void)
		{
		pmu_unregister_sleep_notifier(&apm_sleep_notifier);
		misc_deregister(&apm_device);
		remove_proc_entry("apm", NULL);
		if (apm_get_power_status == pmu_apm_get_power_status)
		apm_get_power_status = NULL;

		printk(KERN_INFO "apm_emu: APM Emulation removed.\n");
		printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
		}

		module_init(apm_emu_init);
		module_exit(apm_emu_exit);

		MODULE_AUTHOR("Benjamin Herrenschmidt");
		MODULE_DESCRIPTION("APM emulation layer for PowerMac");
		MODULE_DESCRIPTION("APM emulation for PowerMac");
		MODULE_LICENSE("GPL");