USB: HID: Steelseries SRW-S1 Add support controlling all LEDs simultaneously

This patch to the SRW-S1 driver adds the ability to control all
LEDs simultaneously as testing showed that it was slow (noticably!!)
when seting or clearing all the LEDs in turn.

It adds a 'RPMALL' LED, whose behavoir is asserted to all the LEDs in
the bar graph, individual LEDs can subsequently be turned on/off
individually.

Signed-off-by: Simon Wood <simon@mungewell.org>
Tested-by: John Murphy <rosegardener@freeode.co.uk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/Documentation/ABI/testing/sysfs-driver-hid-srws1 b/Documentation/ABI/testing/sysfs-driver-hid-srws1
index c27b34d..d0eba70 100644 (file)
--- a/Documentation/ABI/testing/sysfs-driver-hid-srws1
+++ b/Documentation/ABI/testing/sysfs-driver-hid-srws1
@@ -13,6 +13,7 @@ What:         /sys/class/leds/SRWS1::<serial>::RPM12
 What:          /sys/class/leds/SRWS1::<serial>::RPM13
 What:          /sys/class/leds/SRWS1::<serial>::RPM14
 What:          /sys/class/leds/SRWS1::<serial>::RPM15
+What:          /sys/class/leds/SRWS1::<serial>::RPMALL
 Date:          Jan 2013
 KernelVersion: 3.9
 Contact:       Simon Wood <simon@mungewell.org>

diff --git a/drivers/hid/hid-steelseries-srws1.c b/drivers/hid/hid-steelseries-srws1.c
index a738669..365bc9e 100644 (file)
--- a/drivers/hid/hid-steelseries-srws1.c
+++ b/drivers/hid/hid-steelseries-srws1.c
@@ -136,6 +136,42 @@ static void steelseries_srws1_set_leds(struct hid_device *hdev, __u16 leds)
        /* Note: LED change does not show on device until the device is read/polled */
 }
 
+static void steelseries_srws1_led_all_set_brightness(struct led_classdev *led_cdev,
+                       enum led_brightness value)
+{
+       struct device *dev = led_cdev->dev->parent;
+       struct hid_device *hid = container_of(dev, struct hid_device, dev);
+       struct steelseries_srws1_data *drv_data = hid_get_drvdata(hid);
+
+       if (!drv_data) {
+               hid_err(hid, "Device data not found.");
+               return;
+       }
+
+       if (value == LED_OFF)
+               drv_data->led_state = 0;
+       else
+               drv_data->led_state = (1 << (SRWS1_NUMBER_LEDS + 1)) - 1;
+
+       steelseries_srws1_set_leds(hid, drv_data->led_state);
+}
+
+static enum led_brightness steelseries_srws1_led_all_get_brightness(struct led_classdev *led_cdev)
+{
+       struct device *dev = led_cdev->dev->parent;
+       struct hid_device *hid = container_of(dev, struct hid_device, dev);
+       struct steelseries_srws1_data *drv_data;
+
+       drv_data = hid_get_drvdata(hid);
+
+       if (!drv_data) {
+               hid_err(hid, "Device data not found.");
+               return LED_OFF;
+       }
+
+       return (drv_data->led_state >> SRWS1_NUMBER_LEDS) ? LED_FULL : LED_OFF;
+}
+
 static void steelseries_srws1_led_set_brightness(struct led_classdev *led_cdev,
                        enum led_brightness value)
 {
@@ -219,13 +255,34 @@ static int steelseries_srws1_probe(struct hid_device *hdev,
 
        /* register led subsystem */
        drv_data->led_state = 0;
-       for (i = 0; i < SRWS1_NUMBER_LEDS; i++)
+       for (i = 0; i < SRWS1_NUMBER_LEDS + 1; i++)
                drv_data->led[i] = NULL;
 
        steelseries_srws1_set_leds(hdev, 0);
 
-       name_sz = strlen(hdev->uniq) + 15;
+       name_sz = strlen(hdev->uniq) + 16;
+
+       /* 'ALL', for setting all LEDs simultaneously */
+       led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
+       if (!led) {
+               hid_err(hdev, "can't allocate memory for LED ALL\n");
+               goto err_led;
+       }
+
+       name = (void *)(&led[1]);
+       snprintf(name, name_sz, "SRWS1::%s::RPMALL", hdev->uniq);
+       led->name = name;
+       led->brightness = 0;
+       led->max_brightness = 1;
+       led->brightness_get = steelseries_srws1_led_all_get_brightness;
+       led->brightness_set = steelseries_srws1_led_all_set_brightness;
+
+       drv_data->led[SRWS1_NUMBER_LEDS] = led;
+       ret = led_classdev_register(&hdev->dev, led);
+       if (ret)
+               goto err_led;
 
+       /* Each individual LED */
        for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
                led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
                if (!led) {
@@ -248,7 +305,7 @@ static int steelseries_srws1_probe(struct hid_device *hdev,
                        hid_err(hdev, "failed to register LED %d. Aborting.\n", i);
 err_led:
                        /* Deregister all LEDs (if any) */
-                       for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
+                       for (i = 0; i < SRWS1_NUMBER_LEDS + 1; i++) {
                                led = drv_data->led[i];
                                drv_data->led[i] = NULL;
                                if (!led)
@@ -275,7 +332,7 @@ static void steelseries_srws1_remove(struct hid_device *hdev)
 
        if (drv_data) {
                /* Deregister LEDs (if any) */
-               for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
+               for (i = 0; i < SRWS1_NUMBER_LEDS + 1; i++) {
                        led = drv_data->led[i];
                        drv_data->led[i] = NULL;
                        if (!led)