sony-laptop.c

linux 内核源代码

		return 0;

	ret = platform_driver_register(&sony_pf_driver);
	if (ret)
		goto out;

	sony_pf_device = platform_device_alloc("sony-laptop", -1);
	if (!sony_pf_device) {
		ret = -ENOMEM;
		goto out_platform_registered;
	}

	ret = platform_device_add(sony_pf_device);
	if (ret)
		goto out_platform_alloced;

	return 0;

      out_platform_alloced:
	platform_device_put(sony_pf_device);
	sony_pf_device = NULL;
      out_platform_registered:
	platform_driver_unregister(&sony_pf_driver);
      out:
	atomic_dec(&sony_pf_users);
	return ret;
}

static void sony_pf_remove(void)
{
	/* deregister only after the last user has gone */
	if (!atomic_dec_and_test(&sony_pf_users))
		return;

	platform_device_del(sony_pf_device);
	platform_device_put(sony_pf_device);
	platform_driver_unregister(&sony_pf_driver);
}

/*********** SNC (SNY5001) Device ***********/

/* the device uses 1-based values, while the backlight subsystem uses
   0-based values */
#define SONY_MAX_BRIGHTNESS	8

#define SNC_VALIDATE_IN		0
#define SNC_VALIDATE_OUT	1

static ssize_t sony_nc_sysfs_show(struct device *, struct device_attribute *,
			      char *);
static ssize_t sony_nc_sysfs_store(struct device *, struct device_attribute *,
			       const char *, size_t);
static int boolean_validate(const int, const int);
static int brightness_default_validate(const int, const int);

struct sony_nc_value {
	char *name;		/* name of the entry */
	char **acpiget;		/* names of the ACPI get function */
	char **acpiset;		/* names of the ACPI set function */
	int (*validate)(const int, const int);	/* input/output validation */
	int value;		/* current setting */
	int valid;		/* Has ever been set */
	int debug;		/* active only in debug mode ? */
	struct device_attribute devattr;	/* sysfs atribute */
};

#define SNC_HANDLE_NAMES(_name, _values...) \
	static char *snc_##_name[] = { _values, NULL }

#define SNC_HANDLE(_name, _getters, _setters, _validate, _debug) \
	{ \
		.name		= __stringify(_name), \
		.acpiget	= _getters, \
		.acpiset	= _setters, \
		.validate	= _validate, \
		.debug		= _debug, \
		.devattr	= __ATTR(_name, 0, sony_nc_sysfs_show, sony_nc_sysfs_store), \
	}

#define SNC_HANDLE_NULL	{ .name = NULL }

SNC_HANDLE_NAMES(fnkey_get, "GHKE");

SNC_HANDLE_NAMES(brightness_def_get, "GPBR");
SNC_HANDLE_NAMES(brightness_def_set, "SPBR");

SNC_HANDLE_NAMES(cdpower_get, "GCDP");
SNC_HANDLE_NAMES(cdpower_set, "SCDP", "CDPW");

SNC_HANDLE_NAMES(audiopower_get, "GAZP");
SNC_HANDLE_NAMES(audiopower_set, "AZPW");

SNC_HANDLE_NAMES(lanpower_get, "GLNP");
SNC_HANDLE_NAMES(lanpower_set, "LNPW");

SNC_HANDLE_NAMES(lidstate_get, "GLID");

SNC_HANDLE_NAMES(indicatorlamp_get, "GILS");
SNC_HANDLE_NAMES(indicatorlamp_set, "SILS");

SNC_HANDLE_NAMES(gainbass_get, "GMGB");
SNC_HANDLE_NAMES(gainbass_set, "CMGB");

SNC_HANDLE_NAMES(PID_get, "GPID");

SNC_HANDLE_NAMES(CTR_get, "GCTR");
SNC_HANDLE_NAMES(CTR_set, "SCTR");

SNC_HANDLE_NAMES(PCR_get, "GPCR");
SNC_HANDLE_NAMES(PCR_set, "SPCR");

SNC_HANDLE_NAMES(CMI_get, "GCMI");
SNC_HANDLE_NAMES(CMI_set, "SCMI");

static struct sony_nc_value sony_nc_values[] = {
	SNC_HANDLE(brightness_default, snc_brightness_def_get,
			snc_brightness_def_set, brightness_default_validate, 0),
	SNC_HANDLE(fnkey, snc_fnkey_get, NULL, NULL, 0),
	SNC_HANDLE(cdpower, snc_cdpower_get, snc_cdpower_set, boolean_validate, 0),
	SNC_HANDLE(audiopower, snc_audiopower_get, snc_audiopower_set,
			boolean_validate, 0),
	SNC_HANDLE(lanpower, snc_lanpower_get, snc_lanpower_set,
			boolean_validate, 1),
	SNC_HANDLE(lidstate, snc_lidstate_get, NULL,
			boolean_validate, 0),
	SNC_HANDLE(indicatorlamp, snc_indicatorlamp_get, snc_indicatorlamp_set,
			boolean_validate, 0),
	SNC_HANDLE(gainbass, snc_gainbass_get, snc_gainbass_set,
			boolean_validate, 0),
	/* unknown methods */
	SNC_HANDLE(PID, snc_PID_get, NULL, NULL, 1),
	SNC_HANDLE(CTR, snc_CTR_get, snc_CTR_set, NULL, 1),
	SNC_HANDLE(PCR, snc_PCR_get, snc_PCR_set, NULL, 1),
	SNC_HANDLE(CMI, snc_CMI_get, snc_CMI_set, NULL, 1),
	SNC_HANDLE_NULL
};

static acpi_handle sony_nc_acpi_handle;
static struct acpi_device *sony_nc_acpi_device = NULL;

/*
 * acpi_evaluate_object wrappers
 */
static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
{
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, name, NULL, &output);
	if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
		*result = out_obj.integer.value;
		return 0;
	}

	printk(KERN_WARNING DRV_PFX "acpi_callreadfunc failed\n");

	return -1;
}

static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
			    int *result)
{
	struct acpi_object_list params;
	union acpi_object in_obj;
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = value;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, name, &params, &output);
	if (status == AE_OK) {
		if (result != NULL) {
			if (out_obj.type != ACPI_TYPE_INTEGER) {
				printk(KERN_WARNING DRV_PFX "acpi_evaluate_object bad "
				       "return type\n");
				return -1;
			}
			*result = out_obj.integer.value;
		}
		return 0;
	}

	printk(KERN_WARNING DRV_PFX "acpi_evaluate_object failed\n");

	return -1;
}

/*
 * sony_nc_values input/output validate functions
 */

/* brightness_default_validate:
 *
 * manipulate input output values to keep consistency with the
 * backlight framework for which brightness values are 0-based.
 */
static int brightness_default_validate(const int direction, const int value)
{
	switch (direction) {
		case SNC_VALIDATE_OUT:
			return value - 1;
		case SNC_VALIDATE_IN:
			if (value >= 0 && value < SONY_MAX_BRIGHTNESS)
				return value + 1;
	}
	return -EINVAL;
}

/* boolean_validate:
 *
 * on input validate boolean values 0/1, on output just pass the
 * received value.
 */
static int boolean_validate(const int direction, const int value)
{
	if (direction == SNC_VALIDATE_IN) {
		if (value != 0 && value != 1)
			return -EINVAL;
	}
	return value;
}

/*
 * Sysfs show/store common to all sony_nc_values
 */
static ssize_t sony_nc_sysfs_show(struct device *dev, struct device_attribute *attr,
			      char *buffer)
{
	int value;
	struct sony_nc_value *item =
	    container_of(attr, struct sony_nc_value, devattr);

	if (!*item->acpiget)
		return -EIO;

	if (acpi_callgetfunc(sony_nc_acpi_handle, *item->acpiget, &value) < 0)
		return -EIO;

	if (item->validate)
		value = item->validate(SNC_VALIDATE_OUT, value);

	return snprintf(buffer, PAGE_SIZE, "%d\n", value);
}

static ssize_t sony_nc_sysfs_store(struct device *dev,
			       struct device_attribute *attr,
			       const char *buffer, size_t count)
{
	int value;
	struct sony_nc_value *item =
	    container_of(attr, struct sony_nc_value, devattr);

	if (!item->acpiset)
		return -EIO;

	if (count > 31)
		return -EINVAL;

	value = simple_strtoul(buffer, NULL, 10);

	if (item->validate)
		value = item->validate(SNC_VALIDATE_IN, value);

	if (value < 0)
		return value;

	if (acpi_callsetfunc(sony_nc_acpi_handle, *item->acpiset, value, NULL) < 0)
		return -EIO;
	item->value = value;
	item->valid = 1;
	return count;
}


/*
 * Backlight device
 */
static int sony_backlight_update_status(struct backlight_device *bd)
{
	return acpi_callsetfunc(sony_nc_acpi_handle, "SBRT",
				bd->props.brightness + 1, NULL);
}

static int sony_backlight_get_brightness(struct backlight_device *bd)
{
	int value;

	if (acpi_callgetfunc(sony_nc_acpi_handle, "GBRT", &value))
		return 0;
	/* brightness levels are 1-based, while backlight ones are 0-based */
	return value - 1;
}

static struct backlight_device *sony_backlight_device;
static struct backlight_ops sony_backlight_ops = {
	.update_status = sony_backlight_update_status,
	.get_brightness = sony_backlight_get_brightness,
};

/*
 * New SNC-only Vaios event mapping to driver known keys
 */
struct sony_nc_event {
	u8	data;
	u8	event;
};

static struct sony_nc_event *sony_nc_events;

/* Vaio C* --maybe also FE*, N* and AR* ?-- special init sequence
 * for Fn keys
 */
static int sony_nc_C_enable(const struct dmi_system_id *id)
{
	int result = 0;

	printk(KERN_NOTICE DRV_PFX "detected %s\n", id->ident);

	sony_nc_events = id->driver_data;

	if (acpi_callsetfunc(sony_nc_acpi_handle, "SN02", 0x4, &result) < 0
			|| acpi_callsetfunc(sony_nc_acpi_handle, "SN07", 0x2, &result) < 0
			|| acpi_callsetfunc(sony_nc_acpi_handle, "SN02", 0x10, &result) < 0
			|| acpi_callsetfunc(sony_nc_acpi_handle, "SN07", 0x0, &result) < 0
			|| acpi_callsetfunc(sony_nc_acpi_handle, "SN03", 0x2, &result) < 0
			|| acpi_callsetfunc(sony_nc_acpi_handle, "SN07", 0x101, &result) < 0) {
		printk(KERN_WARNING DRV_PFX "failed to initialize SNC, some "
				"functionalities may be missing\n");
		return 1;
	}
	return 0;
}

static struct sony_nc_event sony_C_events[] = {
	{ 0x81, SONYPI_EVENT_FNKEY_F1 },
	{ 0x01, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0x85, SONYPI_EVENT_FNKEY_F5 },
	{ 0x05, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0x86, SONYPI_EVENT_FNKEY_F6 },
	{ 0x06, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0x87, SONYPI_EVENT_FNKEY_F7 },
	{ 0x07, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0x8A, SONYPI_EVENT_FNKEY_F10 },
	{ 0x0A, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0x8C, SONYPI_EVENT_FNKEY_F12 },
	{ 0x0C, SONYPI_EVENT_FNKEY_RELEASED },
	{ 0, 0 },
};

/* SNC-only model map */
static const struct dmi_system_id sony_nc_ids[] = {
		{
			.ident = "Sony Vaio FE Series",
			.callback = sony_nc_C_enable,
			.driver_data = sony_C_events,
			.matches = {
				DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
				DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FE"),
			},
		},
		{
			.ident = "Sony Vaio FZ Series",
			.callback = sony_nc_C_enable,
			.driver_data = sony_C_events,
			.matches = {
				DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
				DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FZ"),
			},
		},
		{
			.ident = "Sony Vaio C Series",
			.callback = sony_nc_C_enable,
			.driver_data = sony_C_events,
			.matches = {
				DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
				DMI_MATCH(DMI_PRODUCT_NAME, "VGN-C"),
			},
		},
		{ }
};

/*
 * ACPI callbacks
 */
static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
{
	struct sony_nc_event *evmap;
	u32 ev = event;
	int result;

	if (ev == 0x92) {
		/* read the key pressed from EC.GECR
		 * A call to SN07 with 0x0202 will do it as well respecting
		 * the current protocol on different OSes
		 *
		 * Note: the path for GECR may be
		 *   \_SB.PCI0.LPCB.EC (C, FE, AR, N and friends)
		 *   \_SB.PCI0.PIB.EC0 (VGN-FR notifications are sent directly, no GECR)
		 *
		 * TODO: we may want to do the same for the older GHKE -need
		 *       dmi list- so this snippet may become one more callback.
		 */
		if (acpi_callsetfunc(handle, "SN07", 0x0202, &result) < 0)
			dprintk("sony_acpi_notify, unable to decode event 0x%.2x\n", ev);
		else
			ev = result & 0xFF;
	}

	if (sony_nc_events)
		for (evmap = sony_nc_events; evmap->event; evmap++) {
			if (evmap->data == ev) {
				ev = evmap->event;
				break;
			}
		}

	dprintk("sony_acpi_notify, event: 0x%.2x\n", ev);
	sony_laptop_report_input_event(ev);
	acpi_bus_generate_proc_event(sony_nc_acpi_device, 1, ev);
}

static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
				      void *context, void **return_value)
{
	struct acpi_namespace_node *node;
	union acpi_operand_object *operand;

	node = (struct acpi_namespace_node *)handle;
	operand = (union acpi_operand_object *)node->object;

	printk(KERN_WARNING DRV_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
	       (u32) operand->method.param_count);

	return AE_OK;
}

/*
 * ACPI device
 */
static int sony_nc_resume(struct acpi_device *device)
{
	struct sony_nc_value *item;

	for (item = sony_nc_values; item->name; item++) {
		int ret;

		if (!item->valid)
			continue;
		ret = acpi_callsetfunc(sony_nc_acpi_handle, *item->acpiset,
				       item->value, NULL);
		if (ret < 0) {
			printk("%s: %d\n", __FUNCTION__, ret);
			break;
		}
	}

	/* set the last requested brightness level */
	if (sony_backlight_device &&
			!sony_backlight_update_status(sony_backlight_device))
		printk(KERN_WARNING DRV_PFX "unable to restore brightness level");

	/* re-initialize models with specific requirements */
	dmi_check_system(sony_nc_ids);

	return 0;
}

static int sony_nc_add(struct acpi_device *device)
{
	acpi_status status;
	int result = 0;
	acpi_handle handle;
	struct sony_nc_value *item;

	printk(KERN_INFO DRV_PFX "%s v%s.\n",
		SONY_NC_DRIVER_NAME, SONY_LAPTOP_DRIVER_VERSION);