diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 29 | ||||
| -rw-r--r-- | arch/arm/common/sharpsl_pm.c | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/apm.c | 672 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/corgi_pm.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/sharpsl_pm.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/spitz_pm.c | 2 | ||||
| -rw-r--r-- | arch/mips/Kconfig | 38 | ||||
| -rw-r--r-- | arch/mips/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/apm.c | 604 | ||||
| -rw-r--r-- | arch/sh/Kconfig | 7 | ||||
| -rw-r--r-- | arch/sh/boards/hp6xx/hp6xx_apm.c | 68 | ||||
| -rw-r--r-- | arch/sh/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/sh/kernel/apm.c | 538 |
14 files changed, 45 insertions, 1923 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 6783c2e..1523046e 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -9,6 +9,7 @@ config ARM bool default y select RTC_LIB + select SYS_SUPPORTS_APM_EMULATION help The ARM series is a line of low-power-consumption RISC chip designs licensed by ARM Ltd and targeted at embedded applications and @@ -17,6 +18,9 @@ config ARM Europe. There is an ARM Linux project with a web page at <http://www.arm.linux.org.uk/>. +config SYS_SUPPORTS_APM_EMULATION + bool + config GENERIC_TIME bool default n @@ -856,31 +860,6 @@ menu "Power management options" source "kernel/power/Kconfig" -config APM - tristate "Advanced Power Management Emulation" - ---help--- - APM is a BIOS specification for saving power using several different - techniques. This is mostly useful for battery powered laptops with - APM compliant BIOSes. If you say Y here, the system time will be - reset after a RESUME operation, the /proc/apm device will provide - battery status information, and user-space programs will receive - notification of APM "events" (e.g. battery status change). - - In order to use APM, you will need supporting software. For location - and more information, read <file:Documentation/pm.txt> and the - Battery Powered Linux mini-HOWTO, available from - <http://www.tldp.org/docs.html#howto>. - - This driver does not spin down disk drives (see the hdparm(8) - manpage ("man 8 hdparm") for that), and it doesn't turn off - VESA-compliant "green" monitors. - - Generally, if you don't have a battery in your machine, there isn't - much point in using this driver and you should say N. If you get - random kernel OOPSes or reboots that don't seem to be related to - anything, try disabling/enabling this option (or disabling/enabling - APM in your BIOS). - endmenu source "net/Kconfig" diff --git a/arch/arm/common/sharpsl_pm.c b/arch/arm/common/sharpsl_pm.c index b359974..a3b450f 100644 --- a/arch/arm/common/sharpsl_pm.c +++ b/arch/arm/common/sharpsl_pm.c @@ -27,7 +27,7 @@ #include <asm/hardware.h> #include <asm/mach-types.h> #include <asm/irq.h> -#include <asm/apm.h> +#include <asm/apm-emulation.h> #include <asm/arch/pm.h> #include <asm/arch/pxa-regs.h> #include <asm/arch/sharpsl.h> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index ab06a86..1b935fb 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -10,7 +10,6 @@ obj-y := compat.o entry-armv.o entry-common.o irq.o \ process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \ time.o traps.o -obj-$(CONFIG_APM) += apm.o obj-$(CONFIG_ISA_DMA_API) += dma.o obj-$(CONFIG_ARCH_ACORN) += ecard.o obj-$(CONFIG_FIQ) += fiq.o diff --git a/arch/arm/kernel/apm.c b/arch/arm/kernel/apm.c deleted file mode 100644 index 2c37b70..0000000 --- a/arch/arm/kernel/apm.c +++ /dev/null @@ -1,672 +0,0 @@ -/* - * bios-less APM driver for ARM Linux - * 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/slab.h> -#include <linux/proc_fs.h> -#include <linux/miscdevice.h> -#include <linux/apm_bios.h> -#include <linux/capability.h> -#include <linux/sched.h> -#include <linux/pm.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/init.h> -#include <linux/completion.h> -#include <linux/kthread.h> -#include <linux/delay.h> - -#include <asm/apm.h> /* apm_power_info */ -#include <asm/system.h> - -/* - * The apm_bios device is one of the misc char devices. - * This is its minor number. - */ -#define APM_MINOR_DEV 134 - -/* - * See Documentation/Config.help for the configuration options. - * - * Various options can be changed at boot time as follows: - * (We allow underscores for compatibility with the modules code) - * apm=on/off enable/disable APM - */ - -/* - * 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_WAIT 4 /* waiting for suspend */ -#define SUSPEND_DONE 5 /* suspend completed */ - - struct apm_queue queue; -}; - -/* - * Local variables - */ -static int suspends_pending; -static int apm_disabled; -static struct task_struct *kapmd_tsk; - -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 DEFINE_SPINLOCK(kapmd_queue_lock); -static struct apm_queue kapmd_queue; - -static DEFINE_MUTEX(state_lock); - -static const char driver_version[] = "1.13"; /* no spaces */ - - - -/* - * Compatibility cruft until the IPAQ people move over to the new - * interface. - */ -static void __apm_get_power_status(struct apm_power_info *info) -{ -} - -/* - * This allows machines to provide their own "apm get power status" function. - */ -void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status; -EXPORT_SYMBOL(apm_get_power_status); - - -/* - * 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(apm_event_t event) -{ - struct apm_user *as; - - down_read(&user_list_lock); - list_for_each_entry(as, &apm_user_list, list) { - if (as->reader) - queue_add_event(&as->queue, event); - } - up_read(&user_list_lock); - wake_up_interruptible(&apm_waitqueue); -} - -/* - * queue_suspend_event - queue an APM suspend event. - * - * Check that we're in a state where we can suspend. If not, - * return -EBUSY. Otherwise, queue an event to all "writer" - * users. If there are no "writer" users, return '1' to - * indicate that we can immediately suspend. - */ -static int queue_suspend_event(apm_event_t event, struct apm_user *sender) -{ - struct apm_user *as; - int ret = 1; - - mutex_lock(&state_lock); - down_read(&user_list_lock); - - /* - * If a thread is still processing, we can't suspend, so reject - * the request. - */ - list_for_each_entry(as, &apm_user_list, list) { - if (as != sender && as->reader && as->writer && as->suser && - as->suspend_state != SUSPEND_NONE) { - ret = -EBUSY; - goto out; - } - } - - list_for_each_entry(as, &apm_user_list, list) { - if (as != sender && as->reader && as->writer && as->suser) { - as->suspend_state = SUSPEND_PENDING; - suspends_pending++; - queue_add_event(&as->queue, event); - ret = 0; - } - } - out: - up_read(&user_list_lock); - mutex_unlock(&state_lock); - wake_up_interruptible(&apm_waitqueue); - return ret; -} - -static void apm_suspend(void) -{ - struct apm_user *as; - int 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); - - /* - * Finally, wake up anyone who is sleeping on the suspend. - */ - mutex_lock(&state_lock); - down_read(&user_list_lock); - list_for_each_entry(as, &apm_user_list, list) { - if (as->suspend_state == SUSPEND_WAIT || - as->suspend_state == SUSPEND_ACKED) { - as->suspend_result = err; - as->suspend_state = SUSPEND_DONE; - } - } - up_read(&user_list_lock); - mutex_unlock(&state_lock); - - wake_up(&apm_suspend_waitqueue); -} - -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; - - mutex_lock(&state_lock); - if (as->suspend_state == SUSPEND_PENDING && - (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)) - as->suspend_state = SUSPEND_READ; - mutex_unlock(&state_lock); - - 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: - mutex_lock(&state_lock); - - as->suspend_result = -EINTR; - - if (as->suspend_state == SUSPEND_READ) { - int pending; - - /* - * 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--; - pending = suspends_pending == 0; - mutex_unlock(&state_lock); - - /* - * If there are no further acknowledges required, - * suspend the system. - */ - if (pending) - apm_suspend(); - - /* - * Wait for the suspend/resume to complete. If there - * are pending acknowledges, we wait here for them. - * - * Note: 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; - - wait_event(apm_suspend_waitqueue, - as->suspend_state == SUSPEND_DONE); - } else { - as->suspend_state = SUSPEND_WAIT; - mutex_unlock(&state_lock); - - /* - * 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. - */ - err = queue_suspend_event(APM_USER_SUSPEND, as); - if (err < 0) { - /* - * Avoid taking the lock here - this - * should be fine. - */ - as->suspend_state = SUSPEND_NONE; - break; - } - - if (err > 0) - apm_suspend(); - - /* - * Wait for the suspend/resume to complete. If there - * are pending acknowledges, we wait here for them. - * - * Note: 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; - - wait_event_interruptible(apm_suspend_waitqueue, - as->suspend_state == SUSPEND_DONE); - } - - current->flags = flags; - - mutex_lock(&state_lock); - err = as->suspend_result; - as->suspend_state = SUSPEND_NONE; - mutex_unlock(&state_lock); - break; - } - - return err; -} - -static int apm_release(struct inode * inode, struct file * filp) -{ - struct apm_user *as = filp->private_data; - int pending = 0; - - 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. - */ - mutex_lock(&state_lock); - if (as->suspend_state != SUSPEND_NONE) { - suspends_pending -= 1; - pending = suspends_pending == 0; - } - mutex_unlock(&state_lock); - if (pending) - 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_get_info(char *buf, char **start, off_t fpos, int length) -{ - struct apm_power_info info; - char *units; - int ret; - - info.ac_line_status = 0xff; - info.battery_status = 0xff; - info.battery_flag = 0xff; - info.battery_life = -1; - info.time = -1; - info.units = -1; - - if (apm_get_power_status) - apm_get_power_status(&info); - - switch (info.units) { - default: units = "?"; break; - case 0: units = "min"; break; - case 1: units = "sec"; break; - } - - ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", - driver_version, APM_32_BIT_SUPPORT, - info.ac_line_status, info.battery_status, - info.battery_flag, info.battery_life, - info.time, units); - - return ret; -} -#endif - -static int kapmd(void *arg) -{ - do { - apm_event_t event; - int ret; - - wait_event_interruptible(kapmd_wait, - !queue_empty(&kapmd_queue) || kthread_should_stop()); - - if (kthread_should_stop()) - 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); - break; - - case APM_USER_SUSPEND: - case APM_SYS_SUSPEND: - ret = queue_suspend_event(event, NULL); - if (ret < 0) { - /* - * We were busy. Try again in 50ms. - */ - queue_add_event(&kapmd_queue, event); - msleep(50); - } - if (ret > 0) - apm_suspend(); - break; - - case APM_CRITICAL_SUSPEND: - apm_suspend(); - break; - } - } while (1); - - return 0; -} - -static int __init apm_init(void) -{ - int ret; - - if (apm_disabled) { - printk(KERN_NOTICE "apm: disabled on user request.\n"); - return -ENODEV; - } - - kapmd_tsk = kthread_create(kapmd, NULL, "kapmd"); - if (IS_ERR(kapmd_tsk)) { - ret = PTR_ERR(kapmd_tsk); - kapmd_tsk = NULL; - return ret; - } - kapmd_tsk->flags |= PF_NOFREEZE; - wake_up_process(kapmd_tsk); - -#ifdef CONFIG_PROC_FS - create_proc_info_entry("apm", 0, NULL, apm_get_info); -#endif - - ret = misc_register(&apm_device); - if (ret != 0) { - remove_proc_entry("apm", NULL); - kthread_stop(kapmd_tsk); - } - - return ret; -} - -static void __exit apm_exit(void) -{ - misc_deregister(&apm_device); - remove_proc_entry("apm", NULL); - - kthread_stop(kapmd_tsk); -} - -module_init(apm_init); -module_exit(apm_exit); - -MODULE_AUTHOR("Stephen Rothwell"); -MODULE_DESCRIPTION("Advanced Power Management"); -MODULE_LICENSE("GPL"); - -#ifndef MODULE -static int __init apm_setup(char *str) -{ - while ((str != NULL) && (*str != '\0')) { - if (strncmp(str, "off", 3) == 0) - apm_disabled = 1; - if (strncmp(str, "on", 2) == 0) - apm_disabled = 0; - str = strchr(str, ','); - if (str != NULL) - str += strspn(str, ", \t"); - } - return 1; -} - -__setup("apm=", apm_setup); -#endif - -/** - * 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) -{ - unsigned long flags; - - spin_lock_irqsave(&kapmd_queue_lock, flags); - queue_add_event(&kapmd_queue, event); - spin_unlock_irqrestore(&kapmd_queue_lock, flags); - - wake_up_interruptible(&kapmd_wait); -} -EXPORT_SYMBOL(apm_queue_event); diff --git a/arch/arm/mach-pxa/corgi_pm.c b/arch/arm/mach-pxa/corgi_pm.c index 4c3de40..165017d 100644 --- a/arch/arm/mach-pxa/corgi_pm.c +++ b/arch/arm/mach-pxa/corgi_pm.c @@ -16,7 +16,7 @@ #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/platform_device.h> -#include <asm/apm.h> +#include <asm/apm-emulation.h> #include <asm/irq.h> #include <asm/mach-types.h> #include <asm/hardware.h> diff --git a/arch/arm/mach-pxa/sharpsl_pm.c b/arch/arm/mach-pxa/sharpsl_pm.c index db6e8f5..b1d8cfc 100644 --- a/arch/arm/mach-pxa/sharpsl_pm.c +++ b/arch/arm/mach-pxa/sharpsl_pm.c @@ -23,7 +23,7 @@ #include <asm/hardware.h> #include <asm/mach-types.h> -#include <asm/apm.h> +#include <asm/apm-emulation.h> #include <asm/arch/pm.h> #include <asm/arch/pxa-regs.h> #include <asm/arch/sharpsl.h> diff --git a/arch/arm/mach-pxa/spitz_pm.c b/arch/arm/mach-pxa/spitz_pm.c index 40be833..b97d543 100644 --- a/arch/arm/mach-pxa/spitz_pm.c +++ b/arch/arm/mach-pxa/spitz_pm.c @@ -16,7 +16,7 @@ #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/platform_device.h> -#include <asm/apm.h> +#include <asm/apm-emulation.h> #include <asm/irq.h> #include <asm/mach-types.h> #include <asm/hardware.h> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 44a0224..9d839a9 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -934,6 +934,9 @@ config CPU_LITTLE_ENDIAN endchoice +config SYS_SUPPORTS_APM_EMULATION + bool + config SYS_SUPPORTS_BIG_ENDIAN bool @@ -1001,6 +1004,7 @@ config SOC_AU1X00 bool select SYS_HAS_CPU_MIPS32_R1 select SYS_SUPPORTS_32BIT_KERNEL + select SYS_SUPPORTS_APM_EMULATION config PNX8550 bool @@ -2071,35 +2075,11 @@ config BINFMT_ELF32 bool default y if MIPS32_O32 || MIPS32_N32 -config PM - bool "Power Management support (EXPERIMENTAL)" - depends on EXPERIMENTAL && SOC_AU1X00 - -config APM - tristate "Advanced Power Management Emulation" - depends on PM - ---help--- - APM is a BIOS specification for saving power using several different - techniques. This is mostly useful for battery powered systems with - APM compliant BIOSes. If you say Y here, the system time will be - reset after a RESUME operation, the /proc/apm device will provide - battery status information, and user-space programs will receive - notification of APM "events" (e.g. battery status change). - - In order to use APM, you will need supporting software. For location - and more information, read <file:Documentation/pm.txt> and the - Battery Powered Linux mini-HOWTO, available from - <http://www.tldp.org/docs.html#howto>. - - This driver does not spin down disk drives (see the hdparm(8) - manpage ("man 8 hdparm") for that), and it doesn't turn off - VESA-compliant "green" monitors. - - Generally, if you don't have a battery in your machine, there isn't - much point in using this driver and you should say N. If you get - random kernel OOPSes or reboots that don't seem to be related to - anything, try disabling/enabling this option (or disabling/enabling - APM in your BIOS). +endmenu + +menu "Power management options" + +source "kernel/power/Kconfig" endmenu diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index bbbb8d7..1bf2c84 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -14,8 +14,6 @@ binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \ obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_MODULES) += mips_ksyms.o module.o -obj-$(CONFIG_APM) += apm.o - obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o obj-$(CONFIG_CPU_TX49XX) += r4k_fpu.o r4k_switch.o diff --git a/arch/mips/kernel/apm.c b/arch/mips/kernel/apm.c deleted file mode 100644 index ba16d07..0000000 --- a/arch/mips/kernel/apm.c +++ /dev/null @@ -1,604 +0,0 @@ -/* - * bios-less APM driver for MIPS Linux - * 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/capability.h> -#include <linux/sched.h> -#include <linux/pm.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/init.h> -#include <linux/completion.h> - -#include <asm/apm.h> /* apm_power_info */ -#include <asm/system.h> - -/* - * The apm_bios device is one of the misc char devices. - * This is its minor number. - */ -#define APM_MINOR_DEV 134 - -/* - * See Documentation/Config.help for the configuration options. - * - * Various options can be changed at boot time as follows: - * (We allow underscores for compatibility with the modules code) - * apm=on/off enable/disable APM - */ - -/* - * 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 int apm_disabled; -static int mips_apm_active; - -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; - - -static const char driver_version[] = "1.13"; /* no spaces */ - - - -/* - * Compatibility cruft until the IPAQ people move over to the new - * interface. - */ -static void __apm_get_power_status(struct apm_power_info *info) -{ -} - -/* - * This allows machines to provide their own "apm get power status" function. - */ -void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status; -EXPORT_SYMBOL(apm_get_power_status); - - -/* - * 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); -} - -static void apm_suspend(void) -{ - struct apm_user *as; - int 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); -} - -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, unsigned int cmd, unsigned 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_get_info(char *buf, char **start, off_t fpos, int length) -{ - struct apm_power_info info; - char *units; - int ret; - - info.ac_line_status = 0xff; - info.battery_status = 0xff; - info.battery_flag = 0xff; - info.battery_life = -1; - info.time = -1; - info.units = -1; - - if (apm_get_power_status) - apm_get_power_status(&info); - - switch (info.units) { - default: units = "?"; break; - case 0: units = "min"; break; - case 1: units = "sec"; break; - } - - ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", - driver_version, APM_32_BIT_SUPPORT, - info.ac_line_status, info.battery_status, - info.battery_flag, info.battery_life, - info.time, units); - - return ret; -} -#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) || !mips_apm_active); - - if (!mips_apm_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; - - if (apm_disabled) { - printk(KERN_NOTICE "apm: disabled on user request.\n"); - return -ENODEV; - } - - mips_apm_active = 1; - - ret = kernel_thread(kapmd, NULL, CLONE_KERNEL); - if (ret < 0) { - mips_apm_active = 0; - return ret; - } - -#ifdef CONFIG_PROC_FS - create_proc_info_entry("apm", 0, NULL, apm_get_info); -#endif - - ret = misc_register(&apm_device); - if (ret != 0) { - remove_proc_entry("apm", NULL); - - mips_apm_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); - - mips_apm_active = 0; - wake_up(&kapmd_wait); - wait_for_completion(&kapmd_exit); -} - -module_init(apm_init); -module_exit(apm_exit); - -MODULE_AUTHOR("Stephen Rothwell"); -MODULE_DESCRIPTION("Advanced Power Management"); -MODULE_LICENSE("GPL"); - -#ifndef MODULE -static int __init apm_setup(char *str) -{ - while ((str != NULL) && (*str != '\0')) { - if (strncmp(str, "off", 3) == 0) - apm_disabled = 1; - if (strncmp(str, "on", 2) == 0) - apm_disabled = 0; - str = strchr(str, ','); - if (str != NULL) - str += strspn(str, ", \t"); - } - return 1; -} - -__setup("apm=", apm_setup); -#endif - -/** - * 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) -{ - unsigned long flags; - - spin_lock_irqsave(&kapmd_queue_lock, flags); - queue_add_event(&kapmd_queue, event); - spin_unlock_irqrestore(&kapmd_queue_lock, flags); - - wake_up_interruptible(&kapmd_wait); -} -EXPORT_SYMBOL(apm_queue_event); diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 3aa3b88..4f38912 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 d146cda..d1c1460 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 99c7e52..2f6d2bc 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 4f66f91..0000000 --- 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"); |
