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Commit 6d96e00c authored by Thomas Renninger's avatar Thomas Renninger Committed by Matthew Garrett
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X86 platform: hp-wmi Better match the HP WMI query interface 



- Improve error handling, by explictly return zero for success, error otherwise
- WMI query command can have arbitrary input sized params
- WMI query command can have specific output sized params (0, 4, 128,..) byte

I like to go on here, but this is a rather intrusive change that should
be looked at first. I am sure the one or other thing can be done better or
there might be typo/bug somewhere.

This did not get any testing yet, only compile tested.

Next steps could be:
  - Eventually introduce hp_wmi_perform_{read,write}_query macros
  - Introduce new wireless query interface (0x1B)
  - more

Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
CC: linux-acpi@vger.kernel.org
CC: platform-driver-x86@vger.kernel.org
parent 8dda6b04

drivers/platform/x86/hp-wmi.c

+107 −30
Original line number Diff line number Diff line
@@ -80,13 +80,12 @@ struct bios_args { 
	u32 command;

	u32 commandtype;

	u32 datasize;

	u32 data;

	char *data;

};



struct bios_return {

	u32 sigpass;

	u32 return_code;

	u32 value;

};



struct key_entry {
@@ -131,7 +130,27 @@ static struct platform_driver hp_wmi_driver = { 
	.remove = hp_wmi_bios_remove,

};



static int hp_wmi_perform_query(int query, int write, int value)

/*

 * hp_wmi_perform_query

 *

 * query:	The commandtype -> What should be queried

 * write:	The command -> 0 read, 1 write, 3 ODM specific

 * buffer:	Buffer used as input and/or output

 * buffersize:	Size of buffer

 *

 * returns zero on success

 *         an HP WMI query specific error code (which is positive)

 *         -EINVAL if the query was not successful at all

 *         -EINVAL if the output buffer size exceeds buffersize

 *

 * Note: The buffersize must at least be the maximum of the input and output

 *       size. E.g. Battery info query (0x7) is defined to have 1 byte input

 *       and 128 byte output. The caller would do:

 *       buffer = kzalloc(128, GFP_KERNEL);

 *       ret = hp_wmi_perform_query(0x7, 0, buffer, 128)

 */

static int hp_wmi_perform_query(int query, int write, char *buffer,

				int buffersize)

{

	struct bios_return bios_return;

	acpi_status status;
@@ -140,8 +159,8 @@ static int hp_wmi_perform_query(int query, int write, int value) 
		.signature = 0x55434553,

		.command = write ? 0x2 : 0x1,

		.commandtype = query,

		.datasize = write ? 0x4 : 0,

		.data = value,

		.datasize = buffersize,

		.data = buffer,

	};

	struct acpi_buffer input = { sizeof(struct bios_args), &args };

	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -158,54 +177,90 @@ static int hp_wmi_perform_query(int query, int write, int value) 
	}



	bios_return = *((struct bios_return *)obj->buffer.pointer);



	if (bios_return.return_code) {

		printk(KERN_WARNING PREFIX "Query %d returned %d\n", query,

		       bios_return.return_code);

		kfree(obj);

	if (bios_return.return_code > 0)

		return bios_return.return_code * -1;

	else

		return bios_return.value;

		return bios_return.return_code;

	}

	if (obj->buffer.length - sizeof(bios_return) > buffersize) {

		kfree(obj);

		return -EINVAL;

	}



	memset(buffer, 0, buffersize);

	memcpy(buffer,

	       ((char *)obj->buffer.pointer) + sizeof(struct bios_return),

	       obj->buffer.length - sizeof(bios_return));

	kfree(obj);

	return 0;

}



static int hp_wmi_display_state(void)

{

	return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);

	int state;

	int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, (char *)&state,

				       sizeof(state));

	if (ret)

		return -EINVAL;

	return state;

}



static int hp_wmi_hddtemp_state(void)

{

	return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);

	int state;

	int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, (char *)&state,

				       sizeof(state));

	if (ret)

		return -EINVAL;

	return state;

}



static int hp_wmi_als_state(void)

{

	return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);

	int state;

	int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, (char *)&state,

				       sizeof(state));

	if (ret)

		return -EINVAL;

	return state;

}



static int hp_wmi_dock_state(void)

{

	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);

	int state;

	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, (char *)&state,

				       sizeof(state));



	if (ret < 0)

		return ret;

	if (ret)

		return -EINVAL;



	return ret & 0x1;

	return state & 0x1;

}



static int hp_wmi_tablet_state(void)

{

	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);



	if (ret < 0)

	int state;

	int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, (char *)&state,

				       sizeof(state));

	if (ret)

		return ret;



	return (ret & 0x4) ? 1 : 0;

	return (state & 0x4) ? 1 : 0;

}



static int hp_wmi_set_block(void *data, bool blocked)

{

	enum hp_wmi_radio r = (enum hp_wmi_radio) data;

	int query = BIT(r + 8) | ((!blocked) << r);

	int ret;



	return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);

	ret = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1,

				   (char *)&query, sizeof(query));

	if (ret)

		return -EINVAL;

	return 0;

}



static const struct rfkill_ops hp_wmi_rfkill_ops = {
@@ -214,8 +269,13 @@ static const struct rfkill_ops hp_wmi_rfkill_ops = { 


static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)

{

	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);

	int mask = 0x200 << (r * 8);

	int wireless;

	int mask;

	hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,

			     (char *)&wireless, sizeof(wireless));

	/* TBD: Pass error */



	mask = 0x200 << (r * 8);



	if (wireless & mask)

		return false;
@@ -225,8 +285,13 @@ static bool hp_wmi_get_sw_state(enum hp_wmi_radio r) 


static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)

{

	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);

	int mask = 0x800 << (r * 8);

	int wireless;

	int mask;

	hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,

			     (char *)&wireless, sizeof(wireless));

	/* TBD: Pass error */



	mask = 0x800 << (r * 8);



	if (wireless & mask)

		return false;
@@ -283,7 +348,11 @@ static ssize_t set_als(struct device *dev, struct device_attribute *attr, 
		       const char *buf, size_t count)

{

	u32 tmp = simple_strtoul(buf, NULL, 10);

	hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);

	int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, (char *)&tmp,

				       sizeof(tmp));

	if (ret)

		return -EINVAL;



	return count;

}
@@ -353,7 +422,7 @@ static void hp_wmi_notify(u32 value, void *context) 
	static struct key_entry *key;

	union acpi_object *obj;

	u32 event_id, event_data;

	int key_code;

	int key_code, ret;

	u32 *location;

	acpi_status status;
@@ -404,8 +473,11 @@ static void hp_wmi_notify(u32 value, void *context) 
	case HPWMI_SMART_ADAPTER:

		break;

	case HPWMI_BEZEL_BUTTON:

		key_code = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,

						 0);

		ret = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,

					   (char *)&key_code,

					   sizeof(key_code));

		if (ret)

			break;

		key = hp_wmi_get_entry_by_scancode(key_code);

		if (key) {

			switch (key->type) {
@@ -503,7 +575,12 @@ static void cleanup_sysfs(struct platform_device *device) 
static int __devinit hp_wmi_bios_setup(struct platform_device *device)

{

	int err;

	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);

	int wireless;



	err = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, (char *)&wireless,

				   sizeof(wireless));

	if (err)

		return err;



	err = device_create_file(&device->dev, &dev_attr_display);

	if (err)