diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/battery.c | 280 |
1 files changed, 57 insertions, 223 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index de506f39d3bd..faa70a50b807 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -27,6 +27,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> +#include <linux/jiffies.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <asm/uaccess.h> @@ -41,27 +42,18 @@ #define ACPI_BATTERY_DEVICE_NAME "Battery" #define ACPI_BATTERY_NOTIFY_STATUS 0x80 #define ACPI_BATTERY_NOTIFY_INFO 0x81 -#define ACPI_BATTERY_UNITS_WATTS "mW" -#define ACPI_BATTERY_UNITS_AMPS "mA" #define _COMPONENT ACPI_BATTERY_COMPONENT -#define ACPI_BATTERY_UPDATE_TIME 0 - -#define ACPI_BATTERY_NONE_UPDATE 0 -#define ACPI_BATTERY_EASY_UPDATE 1 -#define ACPI_BATTERY_INIT_UPDATE 2 - ACPI_MODULE_NAME("battery"); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Battery Driver"); MODULE_LICENSE("GPL"); -static unsigned int update_time = ACPI_BATTERY_UPDATE_TIME; - -/* 0 - every time, > 0 - by update_time */ -module_param(update_time, uint, 0644); +static unsigned int cache_time = 1000; +module_param(cache_time, uint, 0644); +MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); extern struct proc_dir_entry *acpi_lock_battery_dir(void); extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); @@ -95,15 +87,12 @@ enum acpi_battery_files { }; struct acpi_battery { - struct acpi_device *device; struct mutex lock; - unsigned long alarm; - unsigned long update_time[ACPI_BATTERY_NUMFILES]; - int state; + struct acpi_device *device; + unsigned long update_time; int present_rate; int remaining_capacity; int present_voltage; - int power_unit; int design_capacity; int last_full_capacity; int technology; @@ -112,14 +101,14 @@ struct acpi_battery { int design_capacity_low; int capacity_granularity_1; int capacity_granularity_2; + int alarm; char model_number[32]; char serial_number[32]; char type[32]; char oem_info[32]; - u8 present_prev; + int state; + int power_unit; u8 alarm_present; - u8 init_update; - u8 update[ACPI_BATTERY_NUMFILES]; }; inline int acpi_battery_present(struct acpi_battery *battery) @@ -127,33 +116,15 @@ inline int acpi_battery_present(struct acpi_battery *battery) return battery->device->status.battery_present; } -inline char *acpi_battery_power_units(struct acpi_battery *battery) +inline char *acpi_battery_units(struct acpi_battery *battery) { - if (battery->power_unit) - return ACPI_BATTERY_UNITS_AMPS; - else - return ACPI_BATTERY_UNITS_WATTS; -} - -inline acpi_handle acpi_battery_handle(struct acpi_battery *battery) -{ - return battery->device->handle; + return (battery->power_unit)?"mA":"mW"; } /* -------------------------------------------------------------------------- Battery Management -------------------------------------------------------------------------- */ -static void acpi_battery_check_result(struct acpi_battery *battery, int result) -{ - if (!battery) - return; - - if (result) { - battery->init_update = 1; - } -} - struct acpi_offsets { size_t offset; /* offset inside struct acpi_sbs_battery */ u8 mode; /* int or string? */ @@ -228,11 +199,10 @@ static int acpi_battery_get_info(struct acpi_battery *battery) acpi_status status = 0; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - battery->update_time[ACPI_BATTERY_INFO] = get_seconds(); if (!acpi_battery_present(battery)) return 0; mutex_lock(&battery->lock); - status = acpi_evaluate_object(acpi_battery_handle(battery), "_BIF", + status = acpi_evaluate_object(battery->device->handle, "_BIF", NULL, &buffer); mutex_unlock(&battery->lock); if (ACPI_FAILURE(status)) { @@ -251,13 +221,16 @@ static int acpi_battery_get_state(struct acpi_battery *battery) acpi_status status = 0; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - battery->update_time[ACPI_BATTERY_STATE] = get_seconds(); - if (!acpi_battery_present(battery)) return 0; + if (battery->update_time && + time_before(jiffies, battery->update_time + + msecs_to_jiffies(cache_time))) + return 0; + mutex_lock(&battery->lock); - status = acpi_evaluate_object(acpi_battery_handle(battery), "_BST", + status = acpi_evaluate_object(battery->device->handle, "_BST", NULL, &buffer); mutex_unlock(&battery->lock); @@ -267,14 +240,13 @@ static int acpi_battery_get_state(struct acpi_battery *battery) } result = extract_package(battery, buffer.pointer, state_offsets, ARRAY_SIZE(state_offsets)); + battery->update_time = jiffies; kfree(buffer.pointer); return result; } static int acpi_battery_get_alarm(struct acpi_battery *battery) { - battery->update_time[ACPI_BATTERY_ALARM] = get_seconds(); - return 0; } @@ -285,8 +257,6 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery, union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { 1, &arg0 }; - battery->update_time[ACPI_BATTERY_ALARM] = get_seconds(); - if (!acpi_battery_present(battery)) return -ENODEV; @@ -296,8 +266,8 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery, arg0.integer.value = alarm; mutex_lock(&battery->lock); - status = acpi_evaluate_object(acpi_battery_handle(battery), "_BTP", - &arg_list, NULL); + status = acpi_evaluate_object(battery->device->handle, "_BTP", + &arg_list, NULL); mutex_unlock(&battery->lock); if (ACPI_FAILURE(status)) return -ENODEV; @@ -311,112 +281,36 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery, static int acpi_battery_init_alarm(struct acpi_battery *battery) { - int result = 0; acpi_status status = AE_OK; acpi_handle handle = NULL; - unsigned long alarm = battery->alarm; /* See if alarms are supported, and if so, set default */ - - status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle); - if (ACPI_SUCCESS(status)) { - battery->alarm_present = 1; - if (!alarm) { - alarm = battery->design_capacity_warning; - } - result = acpi_battery_set_alarm(battery, alarm); - if (result) - goto end; - } else { + status = acpi_get_handle(battery->device->handle, "_BTP", &handle); + if (ACPI_FAILURE(status)) { battery->alarm_present = 0; + return 0; } - - end: - - return result; + battery->alarm_present = 1; + if (!battery->alarm) + battery->alarm = battery->design_capacity_warning; + return acpi_battery_set_alarm(battery, battery->alarm); } -static int acpi_battery_init_update(struct acpi_battery *battery) +static int acpi_battery_update(struct acpi_battery *battery) { - int result = 0; - - result = acpi_battery_get_status(battery); - if (result) + int saved_present = acpi_battery_present(battery); + int result = acpi_battery_get_status(battery); + if (result || !acpi_battery_present(battery)) return result; - - battery->present_prev = acpi_battery_present(battery); - - if (acpi_battery_present(battery)) { + if (saved_present != acpi_battery_present(battery) || + !battery->update_time) { + battery->update_time = 0; result = acpi_battery_get_info(battery); if (result) return result; - result = acpi_battery_get_state(battery); - if (result) - return result; - acpi_battery_init_alarm(battery); } - - return result; -} - -static int acpi_battery_update(struct acpi_battery *battery, - int update, int *update_result_ptr) -{ - int result = 0; - int update_result = ACPI_BATTERY_NONE_UPDATE; - - if (!acpi_battery_present(battery)) { - update = 1; - } - - if (battery->init_update) { - result = acpi_battery_init_update(battery); - if (result) - goto end; - update_result = ACPI_BATTERY_INIT_UPDATE; - } else if (update) { - result = acpi_battery_get_status(battery); - if (result) - goto end; - if ((!battery->present_prev & acpi_battery_present(battery)) - || (battery->present_prev & !acpi_battery_present(battery))) { - result = acpi_battery_init_update(battery); - if (result) - goto end; - update_result = ACPI_BATTERY_INIT_UPDATE; - } else { - update_result = ACPI_BATTERY_EASY_UPDATE; - } - } - - end: - - battery->init_update = (result != 0); - - *update_result_ptr = update_result; - - return result; -} - -static void acpi_battery_notify_update(struct acpi_battery *battery) -{ - acpi_battery_get_status(battery); - - if (battery->init_update) { - return; - } - - if ((!battery->present_prev & - acpi_battery_present(battery)) || - (battery->present_prev & - !acpi_battery_present(battery))) { - battery->init_update = 1; - } else { - battery->update[ACPI_BATTERY_INFO] = 1; - battery->update[ACPI_BATTERY_STATE] = 1; - battery->update[ACPI_BATTERY_ALARM] = 1; - } + return acpi_battery_get_state(battery); } /* -------------------------------------------------------------------------- @@ -442,7 +336,7 @@ static int acpi_battery_print_info(struct seq_file *seq, int result) /* Battery Units */ - units = acpi_battery_power_units(battery); + units = acpi_battery_units(battery); if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "design capacity: unknown\n"); @@ -511,7 +405,7 @@ static int acpi_battery_print_state(struct seq_file *seq, int result) /* Battery Units */ - units = acpi_battery_power_units(battery); + units = acpi_battery_units(battery); if (!(battery->state & 0x04)) seq_printf(seq, "capacity state: ok\n"); @@ -571,13 +465,13 @@ static int acpi_battery_print_alarm(struct seq_file *seq, int result) /* Battery Units */ - units = acpi_battery_power_units(battery); + units = acpi_battery_units(battery); seq_printf(seq, "alarm: "); if (!battery->alarm) seq_printf(seq, "unsupported\n"); else - seq_printf(seq, "%lu %sh\n", battery->alarm, units); + seq_printf(seq, "%u %sh\n", battery->alarm, units); end: @@ -587,49 +481,35 @@ static int acpi_battery_print_alarm(struct seq_file *seq, int result) return result; } -static ssize_t -acpi_battery_write_alarm(struct file *file, - const char __user * buffer, - size_t count, loff_t * ppos) +static ssize_t acpi_battery_write_alarm(struct file *file, + const char __user * buffer, + size_t count, loff_t * ppos) { int result = 0; char alarm_string[12] = { '\0' }; struct seq_file *m = file->private_data; struct acpi_battery *battery = m->private; - int update_result = ACPI_BATTERY_NONE_UPDATE; if (!battery || (count > sizeof(alarm_string) - 1)) return -EINVAL; - - result = acpi_battery_update(battery, 1, &update_result); if (result) { result = -ENODEV; goto end; } - if (!acpi_battery_present(battery)) { result = -ENODEV; goto end; } - if (copy_from_user(alarm_string, buffer, count)) { result = -EFAULT; goto end; } - alarm_string[count] = '\0'; - - result = acpi_battery_set_alarm(battery, - simple_strtoul(alarm_string, NULL, 0)); - if (result) - goto end; - + battery->alarm = simple_strtol(alarm_string, NULL, 0); + result = acpi_battery_set_alarm(battery, battery->alarm); end: - - acpi_battery_check_result(battery, result); - if (!result) - result = count; + return count; return result; } @@ -648,28 +528,8 @@ static struct acpi_read_mux { static int acpi_battery_read(int fid, struct seq_file *seq) { struct acpi_battery *battery = seq->private; - int result = 0; - int update_result = ACPI_BATTERY_NONE_UPDATE; - int update = 0; - - update = (get_seconds() - battery->update_time[fid] >= update_time); - update = (update | battery->update[fid]); - - result = acpi_battery_update(battery, update, &update_result); - if (result) - goto end; - - if (update_result == ACPI_BATTERY_EASY_UPDATE) { - result = acpi_read_funcs[fid].get(battery); - if (result) - goto end; - } - - end: - result = acpi_read_funcs[fid].print(seq, result); - acpi_battery_check_result(battery, result); - battery->update[fid] = result; - return result; + int result = acpi_battery_update(battery); + return acpi_read_funcs[fid].print(seq, result); } static int acpi_battery_read_info(struct seq_file *seq, void *offset) @@ -793,33 +653,16 @@ static int acpi_battery_remove_fs(struct acpi_device *device) static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) { struct acpi_battery *battery = data; - struct acpi_device *device = NULL; - + struct acpi_device *device; if (!battery) return; - device = battery->device; - - switch (event) { - case ACPI_BATTERY_NOTIFY_STATUS: - case ACPI_BATTERY_NOTIFY_INFO: - case ACPI_NOTIFY_BUS_CHECK: - case ACPI_NOTIFY_DEVICE_CHECK: - device = battery->device; - acpi_battery_notify_update(battery); - acpi_bus_generate_proc_event(device, event, + acpi_battery_update(battery); + acpi_bus_generate_proc_event(device, event, + acpi_battery_present(battery)); + acpi_bus_generate_netlink_event(device->pnp.device_class, + device->dev.bus_id, event, acpi_battery_present(battery)); - acpi_bus_generate_netlink_event(device->pnp.device_class, - device->dev.bus_id, event, - acpi_battery_present(battery)); - break; - default: - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Unsupported event [0x%x]\n", event)); - break; - } - - return; } static int acpi_battery_add(struct acpi_device *device) @@ -840,12 +683,7 @@ static int acpi_battery_add(struct acpi_device *device) strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); acpi_driver_data(device) = battery; mutex_init(&battery->lock); - result = acpi_battery_get_status(battery); - if (result) - goto end; - - battery->init_update = 1; - + acpi_battery_update(battery); result = acpi_battery_add_fs(device); if (result) goto end; @@ -898,14 +736,10 @@ static int acpi_battery_remove(struct acpi_device *device, int type) static int acpi_battery_resume(struct acpi_device *device) { struct acpi_battery *battery; - if (!device) return -EINVAL; - - battery = device->driver_data; - - battery->init_update = 1; - + battery = acpi_driver_data(device); + battery->update_time = 0; return 0; } |