[APM] SH: Convert to use shared APM emulation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 28 insertions, 586 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 3aa3b885ab36..4f3891215b87 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -48,6 +48,9 @@ config GENERIC_IOMAP
 config GENERIC_TIME
         def_bool n
 
+config SYS_SUPPORTS_APM_EMULATION
+        bool
+
 config ARCH_MAY_HAVE_PC_FDC
         bool
 
@@ -126,6 +129,7 @@ config SH_7751_SYSTEMH
 
 config SH_HP6XX
         bool "HP6XX"
+        select SYS_SUPPORTS_APM_EMULATION
         help
           Select HP6XX if configuring for a HP jornada HP6xx.
           More information (hardware only) at
@@ -694,9 +698,6 @@ depends on EXPERIMENTAL
 
 source kernel/power/Kconfig
 
-config APM
-        bool "Advanced Power Management Emulation"
-        depends on PM
 endmenu
 
 source "net/Kconfig"
diff --git a/arch/sh/boards/hp6xx/hp6xx_apm.c b/arch/sh/boards/hp6xx/hp6xx_apm.c
index d146cdaa0b8b..d1c1460c8a06 100644
--- a/arch/sh/boards/hp6xx/hp6xx_apm.c
+++ b/arch/sh/boards/hp6xx/hp6xx_apm.c
@@ -7,12 +7,11 @@
  * modify it under the terms of the GNU General Public License.
  */
 #include <linux/module.h>
-#include <linux/apm_bios.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
-#include <asm/io.h>
-#include <asm/apm.h>
+#include <linux/apm-emulation.h>
+#include <linux/io.h>
 #include <asm/adc.h>
 #include <asm/hp6xx.h>
 
@@ -27,60 +26,41 @@
 
 #define MODNAME "hp6x0_apm"
 
-static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
+static void hp6x0_apm_get_power_status(struct apm_power_info *info)
 {
+        int battery, backup, charging, percentage;
         u8 pgdr;
-        char *p;
-        int battery_status;
-        int battery_flag;
-        int ac_line_status;
-        int time_units = APM_BATTERY_LIFE_UNKNOWN;
 
-        int battery = adc_single(ADC_CHANNEL_BATTERY);
-        int backup = adc_single(ADC_CHANNEL_BACKUP);
-        int charging = adc_single(ADC_CHANNEL_CHARGE);
-        int percentage;
+        battery         = adc_single(ADC_CHANNEL_BATTERY);
+        backup          = adc_single(ADC_CHANNEL_BACKUP);
+        charging        = adc_single(ADC_CHANNEL_CHARGE);
 
         percentage = 100 * (battery - HP680_BATTERY_MIN) /
                            (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
 
-        ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
+        info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
                          APM_AC_ONLINE : APM_AC_OFFLINE;
 
-        p = buf;
-
         pgdr = ctrl_inb(SH7709_PGDR);
         if (pgdr & PGDR_MAIN_BATTERY_OUT) {
-                battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
-                battery_flag = 0x80;
-                percentage = -1;
-        } else if (charging < 8 ) {
-                battery_status = APM_BATTERY_STATUS_CHARGING;
-                battery_flag = 0x08;
-                ac_line_status = 0xff;
+                info->battery_status    = APM_BATTERY_STATUS_NOT_PRESENT;
+                info->battery_flag      = 0x80;
+        } else if (charging < 8) {
+                info->battery_status    = APM_BATTERY_STATUS_CHARGING;
+                info->battery_flag      = 0x08;
+                info->ac_line_status = 0xff;
         } else if (percentage <= APM_CRITICAL) {
-                battery_status = APM_BATTERY_STATUS_CRITICAL;
-                battery_flag = 0x04;
+                info->battery_status    = APM_BATTERY_STATUS_CRITICAL;
+                info->battery_flag      = 0x04;
         } else if (percentage <= APM_LOW) {
-                battery_status = APM_BATTERY_STATUS_LOW;
-                battery_flag = 0x02;
+                info->battery_status    = APM_BATTERY_STATUS_LOW;
+                info->battery_flag      = 0x02;
         } else {
-                battery_status = APM_BATTERY_STATUS_HIGH;
-                battery_flag = 0x01;
+                info->battery_status    = APM_BATTERY_STATUS_HIGH;
+                info->battery_flag      = 0x01;
         }
 
-        p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
-                     APM_32_BIT_SUPPORT,
-                     ac_line_status,
-                     battery_status,
-                     battery_flag,
-                     percentage,
-                     time_units,
-                     "min");
-        p += sprintf(p, "bat=%d backup=%d charge=%d\n",
-                     battery, backup, charging);
-
-        return p - buf;
+        info->units = 0;
 }
 
 static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
@@ -96,14 +76,14 @@ static int __init hp6x0_apm_init(void)
         int ret;
 
         ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
-                          IRQF_DISABLED, MODNAME, 0);
+                          IRQF_DISABLED, MODNAME, NULL);
         if (unlikely(ret < 0)) {
                 printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
                        HP680_BTN_IRQ);
                 return ret;
         }
 
-        apm_get_info = hp6x0_apm_get_info;
+        apm_get_power_status = hp6x0_apm_get_power_status;
 
         return ret;
 }
@@ -111,7 +91,7 @@ static int __init hp6x0_apm_init(void)
 static void __exit hp6x0_apm_exit(void)
 {
         free_irq(HP680_BTN_IRQ, 0);
-        apm_get_info = 0;
+        apm_get_info = NULL;
 }
 
 module_init(hp6x0_apm_init);
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 99c7e5249f7a..2f6d2bcb1c93 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -19,6 +19,5 @@ obj-$(CONFIG_SH_CPU_FREQ)	+= cpufreq.o
 obj-$(CONFIG_MODULES)           += module.o
 obj-$(CONFIG_EARLY_PRINTK)      += early_printk.o
 obj-$(CONFIG_KEXEC)             += machine_kexec.o relocate_kernel.o
-obj-$(CONFIG_APM)               += apm.o
 obj-$(CONFIG_PM)                += pm.o
 obj-$(CONFIG_STACKTRACE)        += stacktrace.o
diff --git a/arch/sh/kernel/apm.c b/arch/sh/kernel/apm.c
deleted file mode 100644
index 4f66f91b1006..000000000000
--- a/arch/sh/kernel/apm.c
+++ /dev/null
@@ -1,538 +0,0 @@
-/*
- * bios-less APM driver for hp680
- *
- * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
- *
- * based on ARM APM driver by
- *  Jamey Hicks <jamey@crl.dec.com>
- *
- * adapted from the APM BIOS driver for Linux by
- *  Stephen Rothwell (sfr@linuxcare.com)
- *
- * APM 1.2 Reference:
- *   Intel Corporation, Microsoft Corporation. Advanced Power Management
- *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
- *
- * [This document is available from Microsoft at:
- *    http://www.microsoft.com/hwdev/busbios/amp_12.htm]
- */
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/timer.h>
-#include <linux/slab.h>
-#include <linux/proc_fs.h>
-#include <linux/miscdevice.h>
-#include <linux/apm_bios.h>
-#include <linux/pm.h>
-#include <linux/pm_legacy.h>
-#include <asm/apm.h>
-
-#define MODNAME "apm"
-
-/*
- * 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                  16
-
-struct apm_queue {
-        unsigned int            event_head;
-        unsigned int            event_tail;
-        apm_event_t             events[APM_MAX_EVENTS];
-};
-
-/*
- * The per-file APM data
- */
-struct apm_user {
-        struct list_head        list;
-
-        unsigned int            suser: 1;
-        unsigned int            writer: 1;
-        unsigned int            reader: 1;
-
-        int                     suspend_result;
-        unsigned int            suspend_state;
-#define SUSPEND_NONE    0               /* no suspend pending */
-#define SUSPEND_PENDING 1               /* suspend pending read */
-#define SUSPEND_READ    2               /* suspend read, pending ack */
-#define SUSPEND_ACKED   3               /* suspend acked */
-#define SUSPEND_DONE    4               /* suspend completed */
-
-        struct apm_queue        queue;
-};
-
-/*
- * Local variables
- */
-static int suspends_pending;
-
-static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
-static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
-
-/*
- * This is a list of everyone who has opened /dev/apm_bios
- */
-static DECLARE_RWSEM(user_list_lock);
-static LIST_HEAD(apm_user_list);
-
-/*
- * kapmd info.  kapmd provides us a process context to handle
- * "APM" events within - specifically necessary if we're going
- * to be suspending the system.
- */
-static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);
-static DECLARE_COMPLETION(kapmd_exit);
-static DEFINE_SPINLOCK(kapmd_queue_lock);
-static struct apm_queue kapmd_queue;
-
-int apm_suspended;
-EXPORT_SYMBOL(apm_suspended);
-
-/* Platform-specific apm_read_proc(). */
-int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);
-EXPORT_SYMBOL(apm_get_info);
-
-/*
- * APM event queue management.
- */
-static inline int queue_empty(struct apm_queue *q)
-{
-        return q->event_head == q->event_tail;
-}
-
-static inline apm_event_t queue_get_event(struct apm_queue *q)
-{
-        q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
-        return q->events[q->event_tail];
-}
-
-static void queue_add_event(struct apm_queue *q, apm_event_t event)
-{
-        q->event_head = (q->event_head + 1) % APM_MAX_EVENTS;
-        if (q->event_head == q->event_tail) {
-                static int notified;
-
-                if (notified++ == 0)
-                        printk(KERN_ERR "apm: an event queue overflowed\n");
-
-                q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
-        }
-        q->events[q->event_head] = event;
-}
-
-static void queue_event_one_user(struct apm_user *as, apm_event_t event)
-{
-        if (as->suser && as->writer) {
-                switch (event) {
-                case APM_SYS_SUSPEND:
-                case APM_USER_SUSPEND:
-                        /*
-                         * If this user already has a suspend pending,
-                         * don't queue another one.
-                         */
-                        if (as->suspend_state != SUSPEND_NONE)
-                                return;
-
-                        as->suspend_state = SUSPEND_PENDING;
-                        suspends_pending++;
-                        break;
-                }
-        }
-        queue_add_event(&as->queue, event);
-}
-
-static void queue_event(apm_event_t event, struct apm_user *sender)
-{
-        struct apm_user *as;
-
-        down_read(&user_list_lock);
-
-        list_for_each_entry(as, &apm_user_list, list)
-                if (as != sender && as->reader)
-                        queue_event_one_user(as, event);
-
-        up_read(&user_list_lock);
-        wake_up_interruptible(&apm_waitqueue);
-}
-
-/**
- * apm_queue_event - queue an APM event for kapmd
- * @event: APM event
- *
- * Queue an APM event for kapmd to process and ultimately take the
- * appropriate action.  Only a subset of events are handled:
- *   %APM_LOW_BATTERY
- *   %APM_POWER_STATUS_CHANGE
- *   %APM_USER_SUSPEND
- *   %APM_SYS_SUSPEND
- *   %APM_CRITICAL_SUSPEND
- */
-void apm_queue_event(apm_event_t event)
-{
-        spin_lock_irq(&kapmd_queue_lock);
-        queue_add_event(&kapmd_queue, event);
-        spin_unlock_irq(&kapmd_queue_lock);
-
-        wake_up_interruptible(&kapmd_wait);
-}
-EXPORT_SYMBOL(apm_queue_event);
-
-static void apm_suspend(void)
-{
-        struct apm_user *as;
-        int err;
-
-        apm_suspended = 1;
-        err = pm_suspend(PM_SUSPEND_MEM);
-
-        /*
-         * Anyone on the APM queues will think we're still suspended.
-         * Send a message so everyone knows we're now awake again.
-         */
-        queue_event(APM_NORMAL_RESUME, NULL);
-
-        /*
-         * Finally, wake up anyone who is sleeping on the suspend.
-         */
-        down_read(&user_list_lock);
-        list_for_each_entry(as, &apm_user_list, list) {
-                as->suspend_result = err;
-                as->suspend_state = SUSPEND_DONE;
-        }
-        up_read(&user_list_lock);
-
-        wake_up(&apm_suspend_waitqueue);
-        apm_suspended = 0;
-}
-
-static ssize_t apm_read(struct file *fp, char __user *buf,
-                        size_t count, loff_t *ppos)
-{
-        struct apm_user *as = fp->private_data;
-        apm_event_t event;
-        int i = count, ret = 0;
-
-        if (count < sizeof(apm_event_t))
-                return -EINVAL;
-
-        if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
-                return -EAGAIN;
-
-        wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
-
-        while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {
-                event = queue_get_event(&as->queue);
-
-                ret = -EFAULT;
-                if (copy_to_user(buf, &event, sizeof(event)))
-                        break;
-
-                if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)
-                        as->suspend_state = SUSPEND_READ;
-
-                buf += sizeof(event);
-                i -= sizeof(event);
-        }
-
-        if (i < count)
-                ret = count - i;
-
-        return ret;
-}
-
-static unsigned int apm_poll(struct file *fp, poll_table * wait)
-{
-        struct apm_user *as = fp->private_data;
-
-        poll_wait(fp, &apm_waitqueue, wait);
-        return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM;
-}
-
-/*
- * apm_ioctl - handle APM ioctl
- *
- * APM_IOC_SUSPEND
- *   This IOCTL is overloaded, and performs two functions.  It is used to:
- *     - initiate a suspend
- *     - acknowledge a suspend read from /dev/apm_bios.
- *   Only when everyone who has opened /dev/apm_bios with write permission
- *   has acknowledge does the actual suspend happen.
- */
-static int
-apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
-{
-        struct apm_user *as = filp->private_data;
-        unsigned long flags;
-        int err = -EINVAL;
-
-        if (!as->suser || !as->writer)
-                return -EPERM;
-
-        switch (cmd) {
-        case APM_IOC_SUSPEND:
-                as->suspend_result = -EINTR;
-
-                if (as->suspend_state == SUSPEND_READ) {
-                        /*
-                         * If we read a suspend command from /dev/apm_bios,
-                         * then the corresponding APM_IOC_SUSPEND ioctl is
-                         * interpreted as an acknowledge.
-                         */
-                        as->suspend_state = SUSPEND_ACKED;
-                        suspends_pending--;
-                } else {
-                        /*
-                         * Otherwise it is a request to suspend the system.
-                         * Queue an event for all readers, and expect an
-                         * acknowledge from all writers who haven't already
-                         * acknowledged.
-                         */
-                        queue_event(APM_USER_SUSPEND, as);
-                }
-
-                /*
-                 * If there are no further acknowledges required, suspend
-                 * the system.
-                 */
-                if (suspends_pending == 0)
-                        apm_suspend();
-
-                /*
-                 * Wait for the suspend/resume to complete.  If there are
-                 * pending acknowledges, we wait here for them.
-                 *
-                 * Note that we need to ensure that the PM subsystem does
-                 * not kick us out of the wait when it suspends the threads.
-                 */
-                flags = current->flags;
-                current->flags |= PF_NOFREEZE;
-
-                /*
-                 * Note: do not allow a thread which is acking the suspend
-                 * to escape until the resume is complete.
-                 */
-                if (as->suspend_state == SUSPEND_ACKED)
-                        wait_event(apm_suspend_waitqueue,
-                                         as->suspend_state == SUSPEND_DONE);
-                else
-                        wait_event_interruptible(apm_suspend_waitqueue,
-                                         as->suspend_state == SUSPEND_DONE);
-
-                current->flags = flags;
-                err = as->suspend_result;
-                as->suspend_state = SUSPEND_NONE;
-                break;
-        }
-
-        return err;
-}
-
-static int apm_release(struct inode * inode, struct file * filp)
-{
-        struct apm_user *as = filp->private_data;
-        filp->private_data = NULL;
-
-        down_write(&user_list_lock);
-        list_del(&as->list);
-        up_write(&user_list_lock);
-
-        /*
-         * We are now unhooked from the chain.  As far as new
-         * events are concerned, we no longer exist.  However, we
-         * need to balance suspends_pending, which means the
-         * possibility of sleeping.
-         */
-        if (as->suspend_state != SUSPEND_NONE) {
-                suspends_pending -= 1;
-                if (suspends_pending == 0)
-                        apm_suspend();
-        }
-
-        kfree(as);
-        return 0;
-}
-
-static int apm_open(struct inode * inode, struct file * filp)
-{
-        struct apm_user *as;
-
-        as = kzalloc(sizeof(*as), GFP_KERNEL);
-        if (as) {
-                /*
-                 * 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->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
-                as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
-
-                down_write(&user_list_lock);
-                list_add(&as->list, &apm_user_list);
-                up_write(&user_list_lock);
-
-                filp->private_data = as;
-        }
-
-        return as ? 0 : -ENOMEM;
-}
-
-static struct file_operations apm_bios_fops = {
-        .owner          = THIS_MODULE,
-        .read           = apm_read,
-        .poll           = apm_poll,
-        .ioctl          = apm_ioctl,
-        .open           = apm_open,
-        .release        = apm_release,
-};
-
-static struct miscdevice apm_device = {
-        .minor          = APM_MINOR_DEV,
-        .name           = "apm_bios",
-        .fops           = &apm_bios_fops
-};
-
-
-#ifdef CONFIG_PROC_FS
-/*
- * Arguments, with symbols from linux/apm_bios.h.
- *
- *   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
- */
-static int apm_read_proc(char *buf, char **start, off_t fpos, int length)
-{
-        if (likely(apm_get_info))
-                return apm_get_info(buf, start, fpos, length);
-
-        return -EINVAL;
-}
-#endif
-
-static int kapmd(void *arg)
-{
-        daemonize("kapmd");
-        current->flags |= PF_NOFREEZE;
-
-        do {
-                apm_event_t event;
-
-                wait_event_interruptible(kapmd_wait,
-                                !queue_empty(&kapmd_queue) || !pm_active);
-
-                if (!pm_active)
-                        break;
-
-                spin_lock_irq(&kapmd_queue_lock);
-                event = 0;
-                if (!queue_empty(&kapmd_queue))
-                        event = queue_get_event(&kapmd_queue);
-                spin_unlock_irq(&kapmd_queue_lock);
-
-                switch (event) {
-                case 0:
-                        break;
-
-                case APM_LOW_BATTERY:
-                case APM_POWER_STATUS_CHANGE:
-                        queue_event(event, NULL);
-                        break;
-
-                case APM_USER_SUSPEND:
-                case APM_SYS_SUSPEND:
-                        queue_event(event, NULL);
-                        if (suspends_pending == 0)
-                                apm_suspend();
-                        break;
-
-                case APM_CRITICAL_SUSPEND:
-                        apm_suspend();
-                        break;
-                }
-        } while (1);
-
-        complete_and_exit(&kapmd_exit, 0);
-}
-
-static int __init apm_init(void)
-{
-        int ret;
-
-        pm_active = 1;
-
-        ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
-        if (unlikely(ret < 0)) {
-                pm_active = 0;
-                return ret;
-        }
-
-        create_proc_info_entry("apm", 0, NULL, apm_read_proc);
-
-        ret = misc_register(&apm_device);
-        if (unlikely(ret != 0)) {
-                remove_proc_entry("apm", NULL);
-
-                pm_active = 0;
-                wake_up(&kapmd_wait);
-                wait_for_completion(&kapmd_exit);
-        }
-
-        return ret;
-}
-
-static void __exit apm_exit(void)
-{
-        misc_deregister(&apm_device);
-        remove_proc_entry("apm", NULL);
-
-        pm_active = 0;
-        wake_up(&kapmd_wait);
-        wait_for_completion(&kapmd_exit);
-}
-
-module_init(apm_init);
-module_exit(apm_exit);
-
-MODULE_AUTHOR("Stephen Rothwell, Andriy Skulysh");
-MODULE_DESCRIPTION("Advanced Power Management");
-MODULE_LICENSE("GPL");