[PATCH] sony-laptop: limit brightness range to DSDT provided ones
The new style brightness control provides an operating range of 9 values (seems consistent over a large number of models sharing the same brightness control methods). Read and use the minimum and maximum values to limit the backlight interface between those boundaries. Signed-off-by: Mattia Dongili <malattia@linux.it> Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Mattia Dongili
Matthew Garrett
parent
6192fa7109
commit
62d2f23e8b
1 changed files with 103 additions and 24 deletions
|
|
@ -934,6 +934,14 @@ static ssize_t sony_nc_sysfs_store(struct device *dev,
|
|||
/*
|
||||
* Backlight device
|
||||
*/
|
||||
struct sony_backlight_props {
|
||||
struct backlight_device *dev;
|
||||
int handle;
|
||||
u8 offset;
|
||||
u8 maxlvl;
|
||||
};
|
||||
struct sony_backlight_props sony_bl_props;
|
||||
|
||||
static int sony_backlight_update_status(struct backlight_device *bd)
|
||||
{
|
||||
return acpi_callsetfunc(sony_nc_acpi_handle, "SBRT",
|
||||
|
|
@ -954,19 +962,23 @@ static int sony_nc_get_brightness_ng(struct backlight_device *bd)
|
|||
{
|
||||
int result;
|
||||
int *handle = (int *)bl_get_data(bd);
|
||||
struct sony_backlight_props *sdev =
|
||||
(struct sony_backlight_props *)bl_get_data(bd);
|
||||
|
||||
sony_call_snc_handle(*handle, 0x0200, &result);
|
||||
sony_call_snc_handle(sdev->handle, 0x0200, &result);
|
||||
|
||||
return result & 0xff;
|
||||
return (result & 0xff) - sdev->offset;
|
||||
}
|
||||
|
||||
static int sony_nc_update_status_ng(struct backlight_device *bd)
|
||||
{
|
||||
int value, result;
|
||||
int *handle = (int *)bl_get_data(bd);
|
||||
struct sony_backlight_props *sdev =
|
||||
(struct sony_backlight_props *)bl_get_data(bd);
|
||||
|
||||
value = bd->props.brightness;
|
||||
if (sony_call_snc_handle(*handle, 0x0100 | (value << 16), &result))
|
||||
value = bd->props.brightness + sdev->offset;
|
||||
if (sony_call_snc_handle(sdev->handle, 0x0100 | (value << 16), &result))
|
||||
return -EIO;
|
||||
|
||||
return value;
|
||||
|
|
@ -982,8 +994,6 @@ static const struct backlight_ops sony_backlight_ng_ops = {
|
|||
.update_status = sony_nc_update_status_ng,
|
||||
.get_brightness = sony_nc_get_brightness_ng,
|
||||
};
|
||||
static int backlight_ng_handle;
|
||||
static struct backlight_device *sony_backlight_device;
|
||||
|
||||
/*
|
||||
* New SNC-only Vaios event mapping to driver known keys
|
||||
|
|
@ -1550,6 +1560,75 @@ static void sony_nc_kbd_backlight_resume(void)
|
|||
&ignore);
|
||||
}
|
||||
|
||||
static void sony_nc_backlight_ng_read_limits(int handle,
|
||||
struct sony_backlight_props *props)
|
||||
{
|
||||
int offset;
|
||||
acpi_status status;
|
||||
u8 brlvl, i;
|
||||
u8 min = 0xff, max = 0x00;
|
||||
struct acpi_object_list params;
|
||||
union acpi_object in_obj;
|
||||
union acpi_object *lvl_enum;
|
||||
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
||||
|
||||
props->handle = handle;
|
||||
props->offset = 0;
|
||||
props->maxlvl = 0xff;
|
||||
|
||||
offset = sony_find_snc_handle(handle);
|
||||
if (offset < 0)
|
||||
return;
|
||||
|
||||
/* try to read the boundaries from ACPI tables, if we fail the above
|
||||
* defaults should be reasonable
|
||||
*/
|
||||
params.count = 1;
|
||||
params.pointer = &in_obj;
|
||||
in_obj.type = ACPI_TYPE_INTEGER;
|
||||
in_obj.integer.value = offset;
|
||||
status = acpi_evaluate_object(sony_nc_acpi_handle, "SN06", ¶ms,
|
||||
&buffer);
|
||||
if (ACPI_FAILURE(status))
|
||||
return;
|
||||
|
||||
lvl_enum = (union acpi_object *) buffer.pointer;
|
||||
if (!lvl_enum) {
|
||||
pr_err("No SN06 return object.");
|
||||
return;
|
||||
}
|
||||
if (lvl_enum->type != ACPI_TYPE_BUFFER) {
|
||||
pr_err("Invalid SN06 return object 0x%.2x\n",
|
||||
lvl_enum->type);
|
||||
goto out_invalid;
|
||||
}
|
||||
|
||||
/* the buffer lists brightness levels available, brightness levels are
|
||||
* from 0 to 8 in the array, other values are used by ALS control.
|
||||
*/
|
||||
for (i = 0; i < 9 && i < lvl_enum->buffer.length; i++) {
|
||||
|
||||
brlvl = *(lvl_enum->buffer.pointer + i);
|
||||
dprintk("Brightness level: %d\n", brlvl);
|
||||
|
||||
if (!brlvl)
|
||||
break;
|
||||
|
||||
if (brlvl > max)
|
||||
max = brlvl;
|
||||
if (brlvl < min)
|
||||
min = brlvl;
|
||||
}
|
||||
props->offset = min;
|
||||
props->maxlvl = max;
|
||||
dprintk("Brightness levels: min=%d max=%d\n", props->offset,
|
||||
props->maxlvl);
|
||||
|
||||
out_invalid:
|
||||
kfree(buffer.pointer);
|
||||
return;
|
||||
}
|
||||
|
||||
static void sony_nc_backlight_setup(void)
|
||||
{
|
||||
acpi_handle unused;
|
||||
|
|
@ -1558,14 +1637,14 @@ static void sony_nc_backlight_setup(void)
|
|||
struct backlight_properties props;
|
||||
|
||||
if (sony_find_snc_handle(0x12f) != -1) {
|
||||
backlight_ng_handle = 0x12f;
|
||||
ops = &sony_backlight_ng_ops;
|
||||
max_brightness = 0xff;
|
||||
sony_nc_backlight_ng_read_limits(0x12f, &sony_bl_props);
|
||||
max_brightness = sony_bl_props.maxlvl - sony_bl_props.offset;
|
||||
|
||||
} else if (sony_find_snc_handle(0x137) != -1) {
|
||||
backlight_ng_handle = 0x137;
|
||||
ops = &sony_backlight_ng_ops;
|
||||
max_brightness = 0xff;
|
||||
sony_nc_backlight_ng_read_limits(0x137, &sony_bl_props);
|
||||
max_brightness = sony_bl_props.maxlvl - sony_bl_props.offset;
|
||||
|
||||
} else if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT",
|
||||
&unused))) {
|
||||
|
|
@ -1578,22 +1657,22 @@ static void sony_nc_backlight_setup(void)
|
|||
memset(&props, 0, sizeof(struct backlight_properties));
|
||||
props.type = BACKLIGHT_PLATFORM;
|
||||
props.max_brightness = max_brightness;
|
||||
sony_backlight_device = backlight_device_register("sony", NULL,
|
||||
&backlight_ng_handle,
|
||||
sony_bl_props.dev = backlight_device_register("sony", NULL,
|
||||
&sony_bl_props,
|
||||
ops, &props);
|
||||
|
||||
if (IS_ERR(sony_backlight_device)) {
|
||||
pr_warning(DRV_PFX "unable to register backlight device\n");
|
||||
sony_backlight_device = NULL;
|
||||
if (IS_ERR(sony_bl_props.dev)) {
|
||||
pr_warn(DRV_PFX "unable to register backlight device\n");
|
||||
sony_bl_props.dev = NULL;
|
||||
} else
|
||||
sony_backlight_device->props.brightness =
|
||||
ops->get_brightness(sony_backlight_device);
|
||||
sony_bl_props.dev->props.brightness =
|
||||
ops->get_brightness(sony_bl_props.dev);
|
||||
}
|
||||
|
||||
static void sony_nc_backlight_cleanup(void)
|
||||
{
|
||||
if (sony_backlight_device)
|
||||
backlight_device_unregister(sony_backlight_device);
|
||||
if (sony_bl_props.dev)
|
||||
backlight_device_unregister(sony_bl_props.dev);
|
||||
}
|
||||
|
||||
static int sony_nc_add(struct acpi_device *device)
|
||||
|
|
@ -2591,7 +2670,7 @@ static long sonypi_misc_ioctl(struct file *fp, unsigned int cmd,
|
|||
mutex_lock(&spic_dev.lock);
|
||||
switch (cmd) {
|
||||
case SONYPI_IOCGBRT:
|
||||
if (sony_backlight_device == NULL) {
|
||||
if (sony_bl_props.dev == NULL) {
|
||||
ret = -EIO;
|
||||
break;
|
||||
}
|
||||
|
|
@ -2604,7 +2683,7 @@ static long sonypi_misc_ioctl(struct file *fp, unsigned int cmd,
|
|||
ret = -EFAULT;
|
||||
break;
|
||||
case SONYPI_IOCSBRT:
|
||||
if (sony_backlight_device == NULL) {
|
||||
if (sony_bl_props.dev == NULL) {
|
||||
ret = -EIO;
|
||||
break;
|
||||
}
|
||||
|
|
@ -2618,8 +2697,8 @@ static long sonypi_misc_ioctl(struct file *fp, unsigned int cmd,
|
|||
break;
|
||||
}
|
||||
/* sync the backlight device status */
|
||||
sony_backlight_device->props.brightness =
|
||||
sony_backlight_get_brightness(sony_backlight_device);
|
||||
sony_bl_props.dev->props.brightness =
|
||||
sony_backlight_get_brightness(sony_bl_props.dev);
|
||||
break;
|
||||
case SONYPI_IOCGBAT1CAP:
|
||||
if (ec_read16(SONYPI_BAT1_FULL, &val16)) {
|
||||
|
|
|
|||
Loading…
Reference in a new issue