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author | Przemo Firszt <przemo@firszt.eu> | 2012-05-10 19:23:52 +0100 |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2012-05-11 14:47:04 +0200 |
commit | d13f5454e4acbbe2a470cc6743c2998cfcd607a8 (patch) | |
tree | b26169f0a09e90e95a73af215579e580b116dbb2 /drivers/hid | |
parent | c653daba895a2d339b3b8f04e69fc111443ef327 (diff) | |
download | linux-stable-d13f5454e4acbbe2a470cc6743c2998cfcd607a8.tar.gz linux-stable-d13f5454e4acbbe2a470cc6743c2998cfcd607a8.tar.bz2 linux-stable-d13f5454e4acbbe2a470cc6743c2998cfcd607a8.zip |
HID: wacom: Add LED selector control for Wacom Intuos4 WL
Add sysfs attribute to control LED selector on Wacom Intuos4. There are 4
different LEDs on the tablet and they can be turned on by something like:
echo 50 > /sys/class/leds/(device # here)\:selector\:1/brightness
Only one can be lit at a time. The brightness range is 0 to 127. This patch
also contains short ABI description.
Signed-off-by: Przemo Firszt <przemo@firszt.eu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r-- | drivers/hid/Kconfig | 1 | ||||
-rw-r--r-- | drivers/hid/hid-wacom.c | 126 |
2 files changed, 127 insertions, 0 deletions
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 4ecc25629a45..6e0d65aca308 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -596,6 +596,7 @@ config HID_WACOM tristate "Wacom Bluetooth devices support" depends on BT_HIDP select POWER_SUPPLY + select LEDS_CLASS ---help--- Support for Wacom Graphire Bluetooth and Intuos4 WL tablets. diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c index a66e1aa25cac..29372edc31c0 100644 --- a/drivers/hid/hid-wacom.c +++ b/drivers/hid/hid-wacom.c @@ -24,6 +24,7 @@ #include <linux/device.h> #include <linux/hid.h> #include <linux/module.h> +#include <linux/leds.h> #include <linux/slab.h> #include <linux/power_supply.h> @@ -31,6 +32,8 @@ #define PAD_DEVICE_ID 0x0F +#define WAC_CMD_LED_CONTROL 0x20 + struct wacom_data { __u16 tool; __u16 butstate; @@ -44,6 +47,8 @@ struct wacom_data { __u8 ps_connected; struct power_supply battery; struct power_supply ac; + __u8 led_selector; + struct led_classdev *leds[4]; }; /*percent of battery capacity for Graphire @@ -64,6 +69,117 @@ static enum power_supply_property wacom_ac_props[] = { POWER_SUPPLY_PROP_SCOPE, }; +static void wacom_leds_set_brightness(struct led_classdev *led_dev, + enum led_brightness value) +{ + struct device *dev = led_dev->dev->parent; + struct hid_device *hdev; + struct wacom_data *wdata; + unsigned char *buf; + __u8 led = 0; + int i; + + hdev = container_of(dev, struct hid_device, dev); + wdata = hid_get_drvdata(hdev); + for (i = 0; i < 4; ++i) { + if (wdata->leds[i] == led_dev) + wdata->led_selector = i; + } + + led = wdata->led_selector | 0x04; + buf = kzalloc(9, GFP_KERNEL); + if (buf) { + buf[0] = WAC_CMD_LED_CONTROL; + buf[1] = led; + buf[2] = value; + hdev->hid_output_raw_report(hdev, buf, 9, HID_FEATURE_REPORT); + kfree(buf); + } + + return; +} + +static enum led_brightness wacom_leds_get_brightness(struct led_classdev *led_dev) +{ + struct wacom_data *wdata; + struct device *dev = led_dev->dev->parent; + int value = 0; + int i; + + wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev)); + + for (i = 0; i < 4; ++i) { + if (wdata->leds[i] == led_dev) { + value = wdata->leds[i]->brightness; + break; + } + } + + return value; +} + + +static int wacom_initialize_leds(struct hid_device *hdev) +{ + struct wacom_data *wdata = hid_get_drvdata(hdev); + struct led_classdev *led; + struct device *dev = &hdev->dev; + size_t namesz = strlen(dev_name(dev)) + 12; + char *name; + int i, ret; + + wdata->led_selector = 0; + + for (i = 0; i < 4; i++) { + led = kzalloc(sizeof(struct led_classdev) + namesz, GFP_KERNEL); + if (!led) { + hid_warn(hdev, + "can't allocate memory for LED selector\n"); + ret = -ENOMEM; + goto err; + } + + name = (void *)&led[1]; + snprintf(name, namesz, "%s:selector:%d", dev_name(dev), i); + led->name = name; + led->brightness = 0; + led->max_brightness = 127; + led->brightness_get = wacom_leds_get_brightness; + led->brightness_set = wacom_leds_set_brightness; + + wdata->leds[i] = led; + + ret = led_classdev_register(dev, wdata->leds[i]); + + if (ret) { + wdata->leds[i] = NULL; + kfree(led); + hid_warn(hdev, "can't register LED\n"); + goto err; + } + } + +err: + return ret; +} + +static void wacom_destroy_leds(struct hid_device *hdev) +{ + struct wacom_data *wdata = hid_get_drvdata(hdev); + struct led_classdev *led; + int i; + + for (i = 0; i < 4; ++i) { + if (wdata->leds[i]) { + led = wdata->leds[i]; + wdata->leds[i] = NULL; + led_classdev_unregister(led); + kfree(led); + } + } + +} + static int wacom_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) @@ -602,6 +718,12 @@ static int wacom_probe(struct hid_device *hdev, sprintf(hdev->name, "%s", "Wacom Intuos4 WL"); wdata->features = 0; wacom_set_features(hdev); + ret = wacom_initialize_leds(hdev); + if (ret) { + hid_warn(hdev, + "can't create led attribute, err: %d\n", ret); + goto destroy_leds; + } break; } @@ -644,6 +766,8 @@ err_ac: err_battery: device_remove_file(&hdev->dev, &dev_attr_speed); hid_hw_stop(hdev); +destroy_leds: + wacom_destroy_leds(hdev); err_free: kfree(wdata); return ret; @@ -652,6 +776,8 @@ err_free: static void wacom_remove(struct hid_device *hdev) { struct wacom_data *wdata = hid_get_drvdata(hdev); + + wacom_destroy_leds(hdev); device_remove_file(&hdev->dev, &dev_attr_speed); hid_hw_stop(hdev); |