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Commit 038fdea2 authored by Alexey Starikovskiy's avatar Alexey Starikovskiy Committed by Len Brown
Browse files

ACPI: Battery: don't use acpi_extract_package() 



acpi_extract_package() creates more problems with memory management than
it solves as helper for package handling.

Signed-off-by: default avatarAlexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ff0ce684

drivers/acpi/battery.c

+139 −220
Original line number Diff line number Diff line
@@ -36,9 +36,6 @@ 


#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF



#define ACPI_BATTERY_FORMAT_BIF	"NNNNNNNNNSSSS"

#define ACPI_BATTERY_FORMAT_BST	"NNNN"



#define ACPI_BATTERY_COMPONENT		0x00040000

#define ACPI_BATTERY_CLASS		"battery"

#define ACPI_BATTERY_DEVICE_NAME	"Battery"
@@ -90,29 +87,6 @@ static struct acpi_driver acpi_battery_driver = { 
		},

};



struct acpi_battery_state {

	acpi_integer state;

	acpi_integer present_rate;

	acpi_integer remaining_capacity;

	acpi_integer present_voltage;

};



struct acpi_battery_info {

	acpi_integer power_unit;

	acpi_integer design_capacity;

	acpi_integer last_full_capacity;

	acpi_integer battery_technology;

	acpi_integer design_voltage;

	acpi_integer design_capacity_warning;

	acpi_integer design_capacity_low;

	acpi_integer battery_capacity_granularity_1;

	acpi_integer battery_capacity_granularity_2;

	acpi_string model_number;

	acpi_string serial_number;

	acpi_string battery_type;

	acpi_string oem_info;

};



enum acpi_battery_files {

	ACPI_BATTERY_INFO = 0,

	ACPI_BATTERY_STATE,
@@ -120,31 +94,42 @@ enum acpi_battery_files{ 
	ACPI_BATTERY_NUMFILES,

};



struct acpi_battery_flags {

	u8 battery_present_prev;

	u8 alarm_present;

	u8 init_update;

	u8 update[ACPI_BATTERY_NUMFILES];

	u8 power_unit;

};



struct acpi_battery {

	struct mutex mutex;

	struct acpi_device *device;

	struct acpi_battery_flags flags;

	struct acpi_buffer bif_data;

	struct acpi_buffer bst_data;

	struct mutex lock;

	unsigned long alarm;

	unsigned long update_time[ACPI_BATTERY_NUMFILES];

	int state;

	int present_rate;

	int remaining_capacity;

	int present_voltage;

	int power_unit;

	int design_capacity;

	int last_full_capacity;

	int technology;

	int design_voltage;

	int design_capacity_warning;

	int design_capacity_low;

	int capacity_granularity_1;

	int capacity_granularity_2;

	char model_number[32];

	char serial_number[32];

	char type[32];

	char oem_info[32];

	u8 present_prev;

	u8 alarm_present;

	u8 init_update;

	u8 update[ACPI_BATTERY_NUMFILES];

};



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)

{

	if (battery->flags.power_unit)

	if (battery->power_unit)

		return ACPI_BATTERY_UNITS_AMPS;

	else

		return ACPI_BATTERY_UNITS_WATTS;
@@ -165,43 +150,63 @@ static void acpi_battery_check_result(struct acpi_battery *battery, int result) 
		return;



	if (result) {

		battery->flags.init_update = 1;

		battery->init_update = 1;

	}

}



static int acpi_battery_extract_package(struct acpi_battery *battery,

					union acpi_object *package,

					struct acpi_buffer *format,

					struct acpi_buffer *data,

					char *package_name)

{

	acpi_status status = AE_OK;

	struct acpi_buffer data_null = { 0, NULL };

struct acpi_offsets {

	size_t offset;		/* offset inside struct acpi_sbs_battery */

	u8 mode;		/* int or string? */

};



	status = acpi_extract_package(package, format, &data_null);

	if (status != AE_BUFFER_OVERFLOW) {

		ACPI_EXCEPTION((AE_INFO, status, "Extracting size %s",

				package_name));

		return -ENODEV;

	}

static struct acpi_offsets state_offsets[] = {

	{offsetof(struct acpi_battery, state), 0},

	{offsetof(struct acpi_battery, present_rate), 0},

	{offsetof(struct acpi_battery, remaining_capacity), 0},

	{offsetof(struct acpi_battery, present_voltage), 0},

};



	if (data_null.length != data->length) {

		kfree(data->pointer);

		data->pointer = kzalloc(data_null.length, GFP_KERNEL);

		if (!data->pointer) {

			ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "kzalloc()"));

			return -ENOMEM;

		}

		data->length = data_null.length;

	}

static struct acpi_offsets info_offsets[] = {

	{offsetof(struct acpi_battery, power_unit), 0},

	{offsetof(struct acpi_battery, design_capacity), 0},

	{offsetof(struct acpi_battery, last_full_capacity), 0},

	{offsetof(struct acpi_battery, technology), 0},

	{offsetof(struct acpi_battery, design_voltage), 0},

	{offsetof(struct acpi_battery, design_capacity_warning), 0},

	{offsetof(struct acpi_battery, design_capacity_low), 0},

	{offsetof(struct acpi_battery, capacity_granularity_1), 0},

	{offsetof(struct acpi_battery, capacity_granularity_2), 0},

	{offsetof(struct acpi_battery, model_number), 1},

	{offsetof(struct acpi_battery, serial_number), 1},

	{offsetof(struct acpi_battery, type), 1},

	{offsetof(struct acpi_battery, oem_info), 1},

};



	status = acpi_extract_package(package, format, data);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Extracting %s",

				package_name));

		return -ENODEV;

static int extract_package(struct acpi_battery *battery,

			   union acpi_object *package,

			   struct acpi_offsets *offsets, int num)

{

	int i, *x;

	union acpi_object *element;

	if (package->type != ACPI_TYPE_PACKAGE)

		return -EFAULT;

	for (i = 0; i < num; ++i) {

		if (package->package.count <= i)

			return -EFAULT;

		element = &package->package.elements[i];

		if (offsets[i].mode) {

			if (element->type != ACPI_TYPE_STRING &&

			    element->type != ACPI_TYPE_BUFFER)

				return -EFAULT;

			strncpy((u8 *)battery + offsets[i].offset,

				element->string.pointer, 32);

		} else {

			if (element->type != ACPI_TYPE_INTEGER)

				return -EFAULT;

			x = (int *)((u8 *)battery + offsets[i].offset);

			*x = element->integer.value;

		}

	}



	return 0;

}
@@ -222,49 +227,21 @@ static int acpi_battery_get_info(struct acpi_battery *battery) 
	int result = 0;

	acpi_status status = 0;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),

		ACPI_BATTERY_FORMAT_BIF

	};

	union acpi_object *package = NULL;

	struct acpi_buffer *data = NULL;

	struct acpi_battery_info *bif = NULL;



	battery->update_time[ACPI_BATTERY_INFO] = get_seconds();



	if (!acpi_battery_present(battery))

		return 0;



	/* Evaluate _BIF */



	status =

	    acpi_evaluate_object(acpi_battery_handle(battery), "_BIF", NULL,

				 &buffer);

	mutex_lock(&battery->lock);

	status = acpi_evaluate_object(acpi_battery_handle(battery), "_BIF",

				      NULL, &buffer);

	mutex_unlock(&battery->lock);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));

		return -ENODEV;

	}



	package = buffer.pointer;



	data = &battery->bif_data;



	/* Extract Package Data */



	result =

	    acpi_battery_extract_package(battery, package, &format, data,

					 "_BIF");

	if (result)

		goto end;



      end:



	result = extract_package(battery, buffer.pointer,

				 info_offsets, ARRAY_SIZE(info_offsets));

	kfree(buffer.pointer);



	if (!result) {

		bif = data->pointer;

		battery->flags.power_unit = bif->power_unit;

	}



	return result;

}
@@ -273,42 +250,24 @@ static int acpi_battery_get_state(struct acpi_battery *battery) 
	int result = 0;

	acpi_status status = 0;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),

		ACPI_BATTERY_FORMAT_BST

	};

	union acpi_object *package = NULL;

	struct acpi_buffer *data = NULL;



	battery->update_time[ACPI_BATTERY_STATE] = get_seconds();



	if (!acpi_battery_present(battery))

		return 0;



	/* Evaluate _BST */

	mutex_lock(&battery->lock);

	status = acpi_evaluate_object(acpi_battery_handle(battery), "_BST",

				      NULL, &buffer);

	mutex_unlock(&battery->lock);



	status =

	    acpi_evaluate_object(acpi_battery_handle(battery), "_BST", NULL,

				 &buffer);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));

		return -ENODEV;

	}



	package = buffer.pointer;



	data = &battery->bst_data;



	/* Extract Package Data */



	result =

	    acpi_battery_extract_package(battery, package, &format, data,

					 "_BST");

	if (result)

		goto end;



      end:

	result = extract_package(battery, buffer.pointer,

				 state_offsets, ARRAY_SIZE(state_offsets));

	kfree(buffer.pointer);



	return result;

}
@@ -331,14 +290,15 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery, 
	if (!acpi_battery_present(battery))

		return -ENODEV;



	if (!battery->flags.alarm_present)

	if (!battery->alarm_present)

		return -ENODEV;



	arg0.integer.value = alarm;



	status =

	    acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",

	mutex_lock(&battery->lock);

	status = acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",

				      &arg_list, NULL);

	mutex_unlock(&battery->lock);

	if (ACPI_FAILURE(status))

		return -ENODEV;
@@ -354,22 +314,21 @@ static int acpi_battery_init_alarm(struct acpi_battery *battery) 
	int result = 0;

	acpi_status status = AE_OK;

	acpi_handle handle = NULL;

	struct acpi_battery_info *bif = battery->bif_data.pointer;

	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->flags.alarm_present = 1;

		if (!alarm && bif) {

			alarm = bif->design_capacity_warning;

		battery->alarm_present = 1;

		if (!alarm) {

			alarm = battery->design_capacity_warning;

		}

		result = acpi_battery_set_alarm(battery, alarm);

		if (result)

			goto end;

	} else {

		battery->flags.alarm_present = 0;

		battery->alarm_present = 0;

	}



      end:
@@ -385,7 +344,7 @@ static int acpi_battery_init_update(struct acpi_battery *battery) 
	if (result)

		return result;



	battery->flags.battery_present_prev = acpi_battery_present(battery);

	battery->present_prev = acpi_battery_present(battery);



	if (acpi_battery_present(battery)) {

		result = acpi_battery_get_info(battery);
@@ -411,7 +370,7 @@ static int acpi_battery_update(struct acpi_battery *battery, 
		update = 1;

	}



	if (battery->flags.init_update) {

	if (battery->init_update) {

		result = acpi_battery_init_update(battery);

		if (result)

			goto end;
@@ -420,8 +379,8 @@ static int acpi_battery_update(struct acpi_battery *battery, 
		result = acpi_battery_get_status(battery);

		if (result)

			goto end;

		if ((!battery->flags.battery_present_prev & acpi_battery_present(battery))

		    || (battery->flags.battery_present_prev & !acpi_battery_present(battery))) {

		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;
@@ -433,7 +392,7 @@ static int acpi_battery_update(struct acpi_battery *battery, 


      end:



	battery->flags.init_update = (result != 0);

	battery->init_update = (result != 0);



	*update_result_ptr = update_result;
@@ -444,19 +403,19 @@ static void acpi_battery_notify_update(struct acpi_battery *battery) 
{

	acpi_battery_get_status(battery);



	if (battery->flags.init_update) {

	if (battery->init_update) {

		return;

	}



	if ((!battery->flags.battery_present_prev &

	if ((!battery->present_prev &

	     acpi_battery_present(battery)) ||

	    (battery->flags.battery_present_prev &

	    (battery->present_prev &

	     !acpi_battery_present(battery))) {

		battery->flags.init_update = 1;

		battery->init_update = 1;

	} else {

		battery->flags.update[ACPI_BATTERY_INFO] = 1;

		battery->flags.update[ACPI_BATTERY_STATE] = 1;

		battery->flags.update[ACPI_BATTERY_ALARM] = 1;

		battery->update[ACPI_BATTERY_INFO] = 1;

		battery->update[ACPI_BATTERY_STATE] = 1;

		battery->update[ACPI_BATTERY_ALARM] = 1;

	}

}
@@ -469,7 +428,6 @@ 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;

	struct acpi_battery_info *bif = NULL;

	char *units = "?";



	if (result)
@@ -482,30 +440,23 @@ static int acpi_battery_print_info(struct seq_file *seq, int result) 
		goto end;

	}



	bif = battery->bif_data.pointer;

	if (!bif) {

		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BIF buffer is NULL"));

		result = -ENODEV;

		goto end;

	}



	/* Battery Units */



	units = acpi_battery_power_units(battery);



	if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "design capacity:         unknown\n");

	else

		seq_printf(seq, "design capacity:         %d %sh\n",

			   (u32) bif->design_capacity, units);

			   (u32) battery->design_capacity, units);



	if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "last full capacity:      unknown\n");

	else

		seq_printf(seq, "last full capacity:      %d %sh\n",

			   (u32) bif->last_full_capacity, units);

			   (u32) battery->last_full_capacity, units);



	switch ((u32) bif->battery_technology) {

	switch ((u32) battery->technology) {

	case 0:

		seq_printf(seq, "battery technology:      non-rechargeable\n");

		break;
@@ -517,23 +468,23 @@ static int acpi_battery_print_info(struct seq_file *seq, int result) 
		break;

	}



	if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "design voltage:          unknown\n");

	else

		seq_printf(seq, "design voltage:          %d mV\n",

			   (u32) bif->design_voltage);

			   (u32) battery->design_voltage);

	seq_printf(seq, "design capacity warning: %d %sh\n",

		   (u32) bif->design_capacity_warning, units);

		   (u32) battery->design_capacity_warning, units);

	seq_printf(seq, "design capacity low:     %d %sh\n",

		   (u32) bif->design_capacity_low, units);

		   (u32) battery->design_capacity_low, units);

	seq_printf(seq, "capacity granularity 1:  %d %sh\n",

		   (u32) bif->battery_capacity_granularity_1, units);

		   (u32) battery->capacity_granularity_1, units);

	seq_printf(seq, "capacity granularity 2:  %d %sh\n",

		   (u32) bif->battery_capacity_granularity_2, units);

	seq_printf(seq, "model number:            %s\n", bif->model_number);

	seq_printf(seq, "serial number:           %s\n", bif->serial_number);

	seq_printf(seq, "battery type:            %s\n", bif->battery_type);

	seq_printf(seq, "OEM info:                %s\n", bif->oem_info);

		   (u32) battery->capacity_granularity_2, units);

	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:
@@ -546,7 +497,6 @@ static int acpi_battery_print_info(struct seq_file *seq, int result) 
static int acpi_battery_print_state(struct seq_file *seq, int result)

{

	struct acpi_battery *battery = seq->private;

	struct acpi_battery_state *bst = NULL;

	char *units = "?";



	if (result)
@@ -559,50 +509,43 @@ static int acpi_battery_print_state(struct seq_file *seq, int result) 
		goto end;

	}



	bst = battery->bst_data.pointer;

	if (!bst) {

		ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BST buffer is NULL"));

		result = -ENODEV;

		goto end;

	}



	/* Battery Units */



	units = acpi_battery_power_units(battery);



	if (!(bst->state & 0x04))

	if (!(battery->state & 0x04))

		seq_printf(seq, "capacity state:          ok\n");

	else

		seq_printf(seq, "capacity state:          critical\n");



	if ((bst->state & 0x01) && (bst->state & 0x02)) {

	if ((battery->state & 0x01) && (battery->state & 0x02)) {

		seq_printf(seq,

			   "charging state:          charging/discharging\n");

	} else if (bst->state & 0x01)

	} else if (battery->state & 0x01)

		seq_printf(seq, "charging state:          discharging\n");

	else if (bst->state & 0x02)

	else if (battery->state & 0x02)

		seq_printf(seq, "charging state:          charging\n");

	else {

		seq_printf(seq, "charging state:          charged\n");

	}



	if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "present rate:            unknown\n");

	else

		seq_printf(seq, "present rate:            %d %s\n",

			   (u32) bst->present_rate, units);

			   (u32) battery->present_rate, units);



	if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "remaining capacity:      unknown\n");

	else

		seq_printf(seq, "remaining capacity:      %d %sh\n",

			   (u32) bst->remaining_capacity, units);

			   (u32) battery->remaining_capacity, units);



	if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)

	if (battery->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)

		seq_printf(seq, "present voltage:         unknown\n");

	else

		seq_printf(seq, "present voltage:         %d mV\n",

			   (u32) bst->present_voltage);

			   (u32) battery->present_voltage);



      end:
@@ -658,8 +601,6 @@ acpi_battery_write_alarm(struct file *file, 
	if (!battery || (count > sizeof(alarm_string) - 1))

		return -EINVAL;



	mutex_lock(&battery->mutex);



	result = acpi_battery_update(battery, 1, &update_result);

	if (result) {

		result = -ENODEV;
@@ -689,9 +630,6 @@ acpi_battery_write_alarm(struct file *file, 


	if (!result)

		result = count;



	mutex_unlock(&battery->mutex);



	return result;

}
@@ -714,10 +652,8 @@ static int acpi_battery_read(int fid, struct seq_file *seq) 
	int update_result = ACPI_BATTERY_NONE_UPDATE;

	int update = 0;



	mutex_lock(&battery->mutex);



	update = (get_seconds() - battery->update_time[fid] >= update_time);

	update = (update | battery->flags.update[fid]);

	update = (update | battery->update[fid]);



	result = acpi_battery_update(battery, update, &update_result);

	if (result)
@@ -732,8 +668,7 @@ static int acpi_battery_read(int fid, struct seq_file *seq) 
      end:

	result = acpi_read_funcs[fid].print(seq, result);

	acpi_battery_check_result(battery, result);

	battery->flags.update[fid] = result;

	mutex_unlock(&battery->mutex);

	battery->update[fid] = result;

	return result;

}
@@ -900,20 +835,16 @@ static int acpi_battery_add(struct acpi_device *device) 
	if (!battery)

		return -ENOMEM;



	mutex_init(&battery->mutex);



	mutex_lock(&battery->mutex);



	battery->device = device;

	strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);

	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->flags.init_update = 1;

	battery->init_update = 1;



	result = acpi_battery_add_fs(device);

	if (result)
@@ -939,8 +870,6 @@ static int acpi_battery_add(struct acpi_device *device) 
		kfree(battery);

	}



	mutex_unlock(&battery->mutex);



	return result;

}
@@ -954,22 +883,12 @@ static int acpi_battery_remove(struct acpi_device *device, int type) 


	battery = acpi_driver_data(device);



	mutex_lock(&battery->mutex);



	status = acpi_remove_notify_handler(device->handle,

					    ACPI_ALL_NOTIFY,

					    acpi_battery_notify);



	acpi_battery_remove_fs(device);



	kfree(battery->bif_data.pointer);



	kfree(battery->bst_data.pointer);



	mutex_unlock(&battery->mutex);



	mutex_destroy(&battery->mutex);



	mutex_destroy(&battery->lock);

	kfree(battery);



	return 0;
@@ -985,7 +904,7 @@ static int acpi_battery_resume(struct acpi_device *device) 


	battery = device->driver_data;



	battery->flags.init_update = 1;

	battery->init_update = 1;



	return 0;

}