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Message-ID: <53248D6D.1010405@intel.com>
Date: Sat, 15 Mar 2014 13:27:09 -0400
From: Lan Tianyu <tianyu.lan@...el.com>
To: Pavel Machek <pavel@....cz>
CC: Stefan Lippers-Hollmann <s.L-H@....de>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Ilia Mirkin <imirkin@...m.mit.edu>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 3.14-rc: /proc/acpi/battery gone?
On 03/15/2014 12:05 PM, Pavel Machek wrote:
> Hi!
>
>>>>> They have attempted to use the sysfs api, but apparently that
>>>>> integration was done with an older version of that API. There's also
>>>>> some attempt to get it to work with upower, but I couldn't figure out
>>>>> how to make that work either on my (up-to-date gentoo) box. (TBH I
>>>>> didn't spend more than an hour or two on it, so it may not be
>>>>> impossible.)
>>>>
>>>> Tianyu, can you please have a look at this?
>>>
>>> Disclaimer, I've never used wmbattery so far.
>>>
>>> The current upstream version (2.42, released in early december 2013)
>>> of wmbattery[1] no longer reads from /proc/acpi/ at all. Apparently
>>> it changed to using upower by default, with non-default fall-backs for
>>> reading from sysfs.
>>>
>>> The only change required for building upower with wmbattery 2.42
>>> appears to be a new build-dependency on libupower-glib-dev (at least
>>> on Debian, built from the upower source package). Given that this
>>> version is present in Debian testing and unstable, I'd assume that it's
>>> supposed to work using upower, although I haven't confirmed that myself.
>>>
>>> Judging from the Gentoo ebuild, you probably just have to add
>>> "sys-power/upower" to the RDEPEND variable and make sure to build
>>> wmbattery 2.42; this is untested.
>>>
>>
>> Hi Stefan:
>> I just glance wmbattery code. I find the code in the acpi.c is
>> already using the new sysfs battery interfaces, right?
>>
>> ...
>>
>> #define SYSFS_PATH "/sys/class/power_supply"
>>
>> ...
>> char *acpi_labels[] = {
>> "uevent",
>> "status",
>> "BAT",
>> "AC",
>> "POWER_SUPPLY_CAPACITY=",
>> "POWER_SUPPLY_??????_FULL_DESIGN=", /* CHARGE or ENERGY */
>> "POWER_SUPPLY_PRESENT=",
>> "POWER_SUPPLY_??????_NOW=",
>> "POWER_SUPPLY_CURRENT_NOW=",
>> "POWER_SUPPLY_STATUS=",
>> #if ACPI_THERMAL
>> "thermal_zone",
>> #endif
>> "POWER_SUPPLY_ONLINE=",
>> "POWER_SUPPLY_??????_FULL=",
>> NULL
>> };
>
> New kernel should work with old userspace... and clearly it does not.
>
> Do you have test patch for a revert?
>
> Pavel
Please try this patch.
commit 6cb7ea8975bf8ffafd893204f55eddd1aebd8ff6
Author: Lan Tianyu <tianyu.lan@...el.com>
Date: Sat Mar 15 12:20:15 2014 -0400
Revert "ACPI / Battery: Remove battery's proc directory" and "ACPI:
Remove CONFIG_ACPI_PROCFS_POWER and cm_sbsc.c"
The commit 1e2d9cd and 7d7ee95 remove ACPI Proc Battery
directory and breaks some old userspace tools. This patch
is to revert them.
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index f60f11d..c9231b1 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -43,6 +43,23 @@ config ACPI_SLEEP
depends on SUSPEND || HIBERNATION
default y
+config ACPI_PROCFS_POWER
+ bool "Deprecated power /proc/acpi directories"
+ depends on PROC_FS
+ help
+ For backwards compatibility, this option allows
+ deprecated power /proc/acpi/ directories to exist, even when
+ they have been replaced by functions in /sys.
+ The deprecated directories (and their replacements) include:
+ /proc/acpi/battery/* (/sys/class/power_supply/*)
+ /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
+ This option has no effect on /proc/acpi/ directories
+ and functions, which do not yet exist in /sys
+ This option, together with the proc directories, will be
+ deleted in 2.6.39.
+
+ Say N to delete power /proc/acpi/ directories that have moved to /sys/
+
config ACPI_EC_DEBUGFS
tristate "EC read/write access through /sys/kernel/debug/ec"
default n
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 0331f91..bce34af 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -47,6 +47,7 @@ acpi-y += sysfs.o
acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
acpi-$(CONFIG_DEBUG_FS) += debugfs.o
acpi-$(CONFIG_ACPI_NUMA) += numa.o
+acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o
ifdef CONFIG_ACPI_VIDEO
acpi-y += video_detect.o
endif
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 797a693..22c8696 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -36,6 +36,12 @@
#include <linux/suspend.h>
#include <asm/unaligned.h>
+#ifdef CONFIG_ACPI_PROCFS_POWER
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+#endif
+
#include <linux/acpi.h>
#include <linux/power_supply.h>
@@ -66,6 +72,19 @@ static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+#ifdef CONFIG_ACPI_PROCFS_POWER
+extern struct proc_dir_entry *acpi_lock_battery_dir(void);
+extern void *acpi_unlock_battery_dir(struct proc_dir_entry
*acpi_battery_dir);
+
+enum acpi_battery_files {
+ info_tag = 0,
+ state_tag,
+ alarm_tag,
+ ACPI_BATTERY_NUMFILES,
+};
+
+#endif
+
static const struct acpi_device_id battery_device_ids[] = {
{"PNP0C0A", 0},
{"", 0},
@@ -301,6 +320,14 @@ static enum power_supply_property
energy_battery_props[] = {
POWER_SUPPLY_PROP_SERIAL_NUMBER,
};
+#ifdef CONFIG_ACPI_PROCFS_POWER
+inline char *acpi_battery_units(struct acpi_battery *battery)
+{
+ return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
+ "mA" : "mW";
+}
+#endif
+
/*
--------------------------------------------------------------------------
Battery Management
--------------------------------------------------------------------------
*/
@@ -719,6 +746,279 @@ static void acpi_battery_refresh(struct
acpi_battery *battery)
}
/*
--------------------------------------------------------------------------
+ FS Interface (/proc)
+
--------------------------------------------------------------------------
*/
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+static struct proc_dir_entry *acpi_battery_dir;
+
+static int acpi_battery_print_info(struct seq_file *seq, int result)
+{
+ struct acpi_battery *battery = seq->private;
+
+ if (result)
+ goto end;
+
+ seq_printf(seq, "present: %s\n",
+ acpi_battery_present(battery) ? "yes" : "no");
+ if (!acpi_battery_present(battery))
+ goto end;
+ if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design capacity: unknown\n");
+ else
+ seq_printf(seq, "design capacity: %d %sh\n",
+ battery->design_capacity,
+ acpi_battery_units(battery));
+
+ if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "last full capacity: unknown\n");
+ else
+ seq_printf(seq, "last full capacity: %d %sh\n",
+ battery->full_charge_capacity,
+ acpi_battery_units(battery));
+
+ seq_printf(seq, "battery technology: %srechargeable\n",
+ (!battery->technology)?"non-":"");
+
+ if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "design voltage: unknown\n");
+ else
+ seq_printf(seq, "design voltage: %d mV\n",
+ battery->design_voltage);
+ seq_printf(seq, "design capacity warning: %d %sh\n",
+ battery->design_capacity_warning,
+ acpi_battery_units(battery));
+ seq_printf(seq, "design capacity low: %d %sh\n",
+ battery->design_capacity_low,
+ acpi_battery_units(battery));
+ seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
+ seq_printf(seq, "capacity granularity 1: %d %sh\n",
+ battery->capacity_granularity_1,
+ acpi_battery_units(battery));
+ seq_printf(seq, "capacity granularity 2: %d %sh\n",
+ battery->capacity_granularity_2,
+ acpi_battery_units(battery));
+ seq_printf(seq, "model number: %s\n", battery->model_number);
+ seq_printf(seq, "serial number: %s\n", battery->serial_number);
+ seq_printf(seq, "battery type: %s\n", battery->type);
+ seq_printf(seq, "OEM info: %s\n", battery->oem_info);
+ end:
+ if (result)
+ seq_printf(seq, "ERROR: Unable to read battery info\n");
+ return result;
+}
+
+static int acpi_battery_print_state(struct seq_file *seq, int result)
+{
+ struct acpi_battery *battery = seq->private;
+
+ if (result)
+ goto end;
+
+ seq_printf(seq, "present: %s\n",
+ acpi_battery_present(battery) ? "yes" : "no");
+ if (!acpi_battery_present(battery))
+ goto end;
+
+ seq_printf(seq, "capacity state: %s\n",
+ (battery->state & 0x04) ? "critical" : "ok");
+ if ((battery->state & 0x01) && (battery->state & 0x02))
+ seq_printf(seq,
+ "charging state: charging/discharging\n");
+ else if (battery->state & 0x01)
+ seq_printf(seq, "charging state: discharging\n");
+ else if (battery->state & 0x02)
+ seq_printf(seq, "charging state: charging\n");
+ else
+ seq_printf(seq, "charging state: charged\n");
+
+ if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present rate: unknown\n");
+ else
+ seq_printf(seq, "present rate: %d %s\n",
+ battery->rate_now, acpi_battery_units(battery));
+
+ if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "remaining capacity: unknown\n");
+ else
+ seq_printf(seq, "remaining capacity: %d %sh\n",
+ battery->capacity_now, acpi_battery_units(battery));
+ if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
+ seq_printf(seq, "present voltage: unknown\n");
+ else
+ seq_printf(seq, "present voltage: %d mV\n",
+ battery->voltage_now);
+ end:
+ if (result)
+ seq_printf(seq, "ERROR: Unable to read battery state\n");
+
+ return result;
+}
+
+static int acpi_battery_print_alarm(struct seq_file *seq, int result)
+{
+ struct acpi_battery *battery = seq->private;
+
+ if (result)
+ goto end;
+
+ if (!acpi_battery_present(battery)) {
+ seq_printf(seq, "present: no\n");
+ goto end;
+ }
+ seq_printf(seq, "alarm: ");
+ if (!battery->alarm)
+ seq_printf(seq, "unsupported\n");
+ else
+ seq_printf(seq, "%u %sh\n", battery->alarm,
+ acpi_battery_units(battery));
+ end:
+ if (result)
+ seq_printf(seq, "ERROR: Unable to read battery alarm\n");
+ return result;
+}
+
+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;
+
+ if (!battery || (count > sizeof(alarm_string) - 1))
+ return -EINVAL;
+ 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';
+ battery->alarm = simple_strtol(alarm_string, NULL, 0);
+ result = acpi_battery_set_alarm(battery);
+ end:
+ if (!result)
+ return count;
+ return result;
+}
+
+typedef int(*print_func)(struct seq_file *seq, int result);
+
+static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
+ acpi_battery_print_info,
+ acpi_battery_print_state,
+ acpi_battery_print_alarm,
+};
+
+static int acpi_battery_read(int fid, struct seq_file *seq)
+{
+ struct acpi_battery *battery = seq->private;
+ int result = acpi_battery_update(battery);
+ return acpi_print_funcs[fid](seq, result);
+}
+
+#define DECLARE_FILE_FUNCTIONS(_name) \
+static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
+{ \
+ return acpi_battery_read(_name##_tag, seq); \
+} \
+static int acpi_battery_##_name##_open_fs(struct inode *inode, struct
file *file) \
+{ \
+ return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
+}
+
+DECLARE_FILE_FUNCTIONS(info);
+DECLARE_FILE_FUNCTIONS(state);
+DECLARE_FILE_FUNCTIONS(alarm);
+
+#undef DECLARE_FILE_FUNCTIONS
+
+#define FILE_DESCRIPTION_RO(_name) \
+ { \
+ .name = __stringify(_name), \
+ .mode = S_IRUGO, \
+ .ops = { \
+ .open = acpi_battery_##_name##_open_fs, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+#define FILE_DESCRIPTION_RW(_name) \
+ { \
+ .name = __stringify(_name), \
+ .mode = S_IFREG | S_IRUGO | S_IWUSR, \
+ .ops = { \
+ .open = acpi_battery_##_name##_open_fs, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .write = acpi_battery_write_##_name, \
+ .release = single_release, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+static const struct battery_file {
+ struct file_operations ops;
+ umode_t mode;
+ const char *name;
+} acpi_battery_file[] = {
+ FILE_DESCRIPTION_RO(info),
+ FILE_DESCRIPTION_RO(state),
+ FILE_DESCRIPTION_RW(alarm),
+};
+
+#undef FILE_DESCRIPTION_RO
+#undef FILE_DESCRIPTION_RW
+
+static int acpi_battery_add_fs(struct acpi_device *device)
+{
+ struct proc_dir_entry *entry = NULL;
+ int i;
+
+ printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
+ " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
+ if (!acpi_device_dir(device)) {
+ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+ acpi_battery_dir);
+ if (!acpi_device_dir(device))
+ return -ENODEV;
+ }
+
+ for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
+ entry = proc_create_data(acpi_battery_file[i].name,
+ acpi_battery_file[i].mode,
+ acpi_device_dir(device),
+ &acpi_battery_file[i].ops,
+ acpi_driver_data(device));
+ if (!entry)
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static void acpi_battery_remove_fs(struct acpi_device *device)
+{
+ int i;
+ if (!acpi_device_dir(device))
+ return;
+ for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
+ remove_proc_entry(acpi_battery_file[i].name,
+ acpi_device_dir(device));
+
+ remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
+ acpi_device_dir(device) = NULL;
+}
+
+#endif
+
+/*
--------------------------------------------------------------------------
Driver Interface
--------------------------------------------------------------------------
*/
@@ -791,6 +1091,15 @@ static int acpi_battery_add(struct acpi_device
*device)
result = acpi_battery_update(battery);
if (result)
goto fail;
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ result = acpi_battery_add_fs(device);
+#endif
+ if (result) {
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_remove_fs(device);
+#endif
+ goto fail;
+ }
printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
@@ -817,6 +1126,9 @@ static int acpi_battery_remove(struct acpi_device
*device)
return -EINVAL;
battery = acpi_driver_data(device);
unregister_pm_notifier(&battery->pm_nb);
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_remove_fs(device);
+#endif
sysfs_remove_battery(battery);
mutex_destroy(&battery->lock);
mutex_destroy(&battery->sysfs_lock);
@@ -864,10 +1176,21 @@ static void __init acpi_battery_init_async(void
*unused, async_cookie_t cookie)
{
if (acpi_disabled)
return;
-
if (dmi_check_system(bat_dmi_table))
battery_bix_broken_package = 1;
- acpi_bus_register_driver(&acpi_battery_driver);
+
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_battery_dir = acpi_lock_battery_dir();
+ if (!acpi_battery_dir)
+ return;
+#endif
+ if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_unlock_battery_dir(acpi_battery_dir);
+#endif
+ return;
+ }
+ return;
}
static int __init acpi_battery_init(void)
@@ -879,6 +1202,9 @@ static int __init acpi_battery_init(void)
static void __exit acpi_battery_exit(void)
{
acpi_bus_unregister_driver(&acpi_battery_driver);
+#ifdef CONFIG_ACPI_PROCFS_POWER
+ acpi_unlock_battery_dir(acpi_battery_dir);
+#endif
}
module_init(acpi_battery_init);
diff --git a/drivers/acpi/cm_sbs.c b/drivers/acpi/cm_sbs.c
new file mode 100644
index 0000000..6c9ee68
--- /dev/null
+++ b/drivers/acpi/cm_sbs.c
@@ -0,0 +1,105 @@
+/*
+ *
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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 of the License, 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ *
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+#define PREFIX "ACPI: "
+
+ACPI_MODULE_NAME("cm_sbs");
+#define ACPI_AC_CLASS "ac_adapter"
+#define ACPI_BATTERY_CLASS "battery"
+#define _COMPONENT ACPI_SBS_COMPONENT
+static struct proc_dir_entry *acpi_ac_dir;
+static struct proc_dir_entry *acpi_battery_dir;
+
+static DEFINE_MUTEX(cm_sbs_mutex);
+
+static int lock_ac_dir_cnt;
+static int lock_battery_dir_cnt;
+
+struct proc_dir_entry *acpi_lock_ac_dir(void)
+{
+ mutex_lock(&cm_sbs_mutex);
+ if (!acpi_ac_dir)
+ acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
+ if (acpi_ac_dir) {
+ lock_ac_dir_cnt++;
+ } else {
+ printk(KERN_ERR PREFIX
+ "Cannot create %s\n", ACPI_AC_CLASS);
+ }
+ mutex_unlock(&cm_sbs_mutex);
+ return acpi_ac_dir;
+}
+EXPORT_SYMBOL(acpi_lock_ac_dir);
+
+void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
+{
+ mutex_lock(&cm_sbs_mutex);
+ if (acpi_ac_dir_param)
+ lock_ac_dir_cnt--;
+ if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
+ remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
+ acpi_ac_dir = NULL;
+ }
+ mutex_unlock(&cm_sbs_mutex);
+}
+EXPORT_SYMBOL(acpi_unlock_ac_dir);
+
+struct proc_dir_entry *acpi_lock_battery_dir(void)
+{
+ mutex_lock(&cm_sbs_mutex);
+ if (!acpi_battery_dir) {
+ acpi_battery_dir =
+ proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
+ }
+ if (acpi_battery_dir) {
+ lock_battery_dir_cnt++;
+ } else {
+ printk(KERN_ERR PREFIX
+ "Cannot create %s\n", ACPI_BATTERY_CLASS);
+ }
+ mutex_unlock(&cm_sbs_mutex);
+ return acpi_battery_dir;
+}
+EXPORT_SYMBOL(acpi_lock_battery_dir);
+
+void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
+{
+ mutex_lock(&cm_sbs_mutex);
+ if (acpi_battery_dir_param)
+ lock_battery_dir_cnt--;
+ if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
+ && acpi_battery_dir) {
+ remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
+ acpi_battery_dir = NULL;
+ }
+ mutex_unlock(&cm_sbs_mutex);
+ return;
+}
+EXPORT_SYMBOL(acpi_unlock_battery_dir);
>
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