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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/macintosh/apm_emu.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/macintosh/apm_emu.c')
-rw-r--r--drivers/macintosh/apm_emu.c553
1 files changed, 553 insertions, 0 deletions
diff --git a/drivers/macintosh/apm_emu.c b/drivers/macintosh/apm_emu.c
new file mode 100644
index 00000000000..19d3e05d682
--- /dev/null
+++ b/drivers/macintosh/apm_emu.c
@@ -0,0 +1,553 @@
+/* APM emulation layer for PowerMac
+ *
+ * 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
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ *
+ */
+
+#include <linux/config.h>
+#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/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 int 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 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 = (struct apm_user *)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 int 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");
+
+ return 1;
+}
+
+static int apm_notify_sleep(struct pmu_sleep_notifier *self, int when)
+{
+ switch(when) {
+ case PBOOK_SLEEP_REQUEST:
+ queue_event(APM_SYS_SUSPEND, NULL);
+ if (!wait_all_suspend())
+ return PBOOK_SLEEP_REFUSE;
+ break;
+ case PBOOK_SLEEP_REJECT:
+ case PBOOK_WAKE:
+ queue_event(APM_NORMAL_RESUME, NULL);
+ break;
+ }
+ return PBOOK_SLEEP_OK;
+}
+
+#define APM_CRITICAL 10
+#define APM_LOW 30
+
+static int apm_emu_get_info(char *buf, char **start, off_t fpos, int length)
+{
+ /* 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 = 0xff;
+ unsigned short battery_status = 0xff;
+ unsigned short battery_flag = 0xff;
+ int percentage = -1;
+ 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);
+ for (i=0; i<pmu_battery_count; i++) {
+ if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
+ if (percentage < 0)
+ percentage = 0;
+ if (charge < 0)
+ charge = 0;
+ percentage += (pmu_batteries[i].charge * 100) /
+ pmu_batteries[i].max_charge;
+ charge += pmu_batteries[i].charge;
+ amperage += pmu_batteries[i].amperage;
+ if (btype == 0)
+ btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
+ real_count++;
+ if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
+ charging++;
+ }
+ }
+ if (real_count) {
+ if (amperage < 0) {
+ if (btype == PMU_BATT_TYPE_SMART)
+ time_units = (charge * 59) / (amperage * -1);
+ else
+ time_units = (charge * 16440) / (amperage * -60);
+ }
+ percentage /= real_count;
+ if (charging > 0) {
+ battery_status = 0x03;
+ battery_flag = 0x08;
+ } else if (percentage <= APM_CRITICAL) {
+ battery_status = 0x02;
+ battery_flag = 0x04;
+ } else if (percentage <= APM_LOW) {
+ battery_status = 0x01;
+ battery_flag = 0x02;
+ } else {
+ battery_status = 0x00;
+ battery_flag = 0x01;
+ }
+ }
+ 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;
+}
+
+static 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;
+
+ misc_register(&apm_device);
+
+ pmu_register_sleep_notifier(&apm_sleep_notifier);
+
+ printk(KERN_INFO "apm_emu: APM Emulation %s initialized.\n", driver_version);
+
+ 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);
+
+ printk(KERN_INFO "apm_emu: 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_LICENSE("GPL");
+