From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-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! --- drivers/macintosh/apm_emu.c | 553 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 553 insertions(+) create mode 100644 drivers/macintosh/apm_emu.c (limited to 'drivers/macintosh/apm_emu.c') 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 +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include + +#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 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"); + -- cgit v1.2.3