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Subject[PATCH 3/4] USB: HID: SRW-S1 Add support for LEDs
Date
From: simon <simon@simon-virtual-machine.(none)>

This patch to the SRW-S1 driver adds support for the LED RPM
meter on the front of the device. The LEDs are controlled via
/sys/class/leds interface, with an individual control for each
of the 15 LEDs.

Signed-off-by: Simon Wood <simon@mungewell.org>
tested-by: John Murphy <rosegardener@freeode.co.uk>

---
Documentation/ABI/testing/sysfs-driver-hid-srws1 | 20 +++
drivers/hid/hid-srws1.c | 199 ++++++++++++++++++++++
2 files changed, 219 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-driver-hid-srws1

diff --git a/Documentation/ABI/testing/sysfs-driver-hid-srws1 b/Documentation/ABI/testing/sysfs-driver-hid-srws1
new file mode 100644
index 0000000..c27b34d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-hid-srws1
@@ -0,0 +1,20 @@
+What: /sys/class/leds/SRWS1::<serial>::RPM1
+What: /sys/class/leds/SRWS1::<serial>::RPM2
+What: /sys/class/leds/SRWS1::<serial>::RPM3
+What: /sys/class/leds/SRWS1::<serial>::RPM4
+What: /sys/class/leds/SRWS1::<serial>::RPM5
+What: /sys/class/leds/SRWS1::<serial>::RPM6
+What: /sys/class/leds/SRWS1::<serial>::RPM7
+What: /sys/class/leds/SRWS1::<serial>::RPM8
+What: /sys/class/leds/SRWS1::<serial>::RPM9
+What: /sys/class/leds/SRWS1::<serial>::RPM10
+What: /sys/class/leds/SRWS1::<serial>::RPM11
+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
+Date: Jan 2013
+KernelVersion: 3.9
+Contact: Simon Wood <simon@mungewell.org>
+Description: Provides a control for turning on/off the LEDs which form
+ an RPM meter on the front of the controller
diff --git a/drivers/hid/hid-srws1.c b/drivers/hid/hid-srws1.c
index 4d8a86b..6005b84 100644
--- a/drivers/hid/hid-srws1.c
+++ b/drivers/hid/hid-srws1.c
@@ -12,11 +12,21 @@
*/

#include <linux/device.h>
+#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/module.h>

+#include "usbhid/usbhid.h"
#include "hid-ids.h"

+#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+#define SRWS1_NUMBER_LEDS 15
+struct srws1_data {
+ __u16 led_state;
+ struct led_classdev *led[SRWS1_NUMBER_LEDS];
+};
+#endif
+
/* Fixed report descriptor for Steelseries SRW-S1 wheel controller
*
* The original descriptor hides the sensitivity and assists dials
@@ -97,6 +107,191 @@ static __u8 srws1_rdesc_fixed[] = {
0xC0 /* End Collection */
};

+#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+static void srws1_set_leds(struct hid_device *hdev, __u16 leds)
+{
+ struct list_head *report_list = &hdev->report_enum[HID_OUTPUT_REPORT].report_list;
+ struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
+ __s32 *value = report->field[0]->value;
+
+ value[0] = 0x40;
+ value[1] = leds;
+ value[2] = leds >> 8;
+ value[3] = 0x00;
+ value[4] = 0x00;
+ value[5] = 0x00;
+ value[6] = 0x00;
+ value[7] = 0x00;
+ value[8] = 0x00;
+ value[9] = 0x00;
+ value[10] = 0x00;
+ value[11] = 0x00;
+ value[12] = 0x00;
+ value[13] = 0x00;
+ value[14] = 0x00;
+ value[15] = 0x00;
+
+ usbhid_submit_report(hdev, report, USB_DIR_OUT);
+
+ /* Note: LED change does not show on device until the device is read/polled */
+}
+
+static void srws1_led_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 srws1_data *drv_data = hid_get_drvdata(hid);
+ int i, state = 0;
+
+ if (!drv_data) {
+ hid_err(hid, "Device data not found.");
+ return;
+ }
+
+ for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
+ if (led_cdev != drv_data->led[i])
+ continue;
+
+ state = (drv_data->led_state >> i) & 1;
+ if (value == LED_OFF && state) {
+ drv_data->led_state &= ~(1 << i);
+ srws1_set_leds(hid, drv_data->led_state);
+ } else if (value != LED_OFF && !state) {
+ drv_data->led_state |= 1 << i;
+ srws1_set_leds(hid, drv_data->led_state);
+ }
+ break;
+ }
+}
+
+static enum led_brightness srws1_led_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 srws1_data *drv_data;
+ int i, value = 0;
+
+ drv_data = hid_get_drvdata(hid);
+
+ if (!drv_data) {
+ hid_err(hid, "Device data not found.");
+ return LED_OFF;
+ }
+
+ for (i = 0; i < SRWS1_NUMBER_LEDS; i++)
+ if (led_cdev == drv_data->led[i]) {
+ value = (drv_data->led_state >> i) & 1;
+ break;
+ }
+
+ return value ? LED_FULL : LED_OFF;
+}
+
+static int srws1_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ int ret, i;
+ struct led_classdev *led;
+ size_t name_sz;
+ char *name;
+
+ struct srws1_data *drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
+
+ if (drv_data == NULL) {
+ hid_err(hdev, "can't alloc SRW-S1 memory\n");
+ return -ENOMEM;
+ }
+
+ hid_set_drvdata(hdev, drv_data);
+
+ ret = hid_parse(hdev);
+ if (ret) {
+ hid_err(hdev, "parse failed\n");
+ goto err_free;
+ }
+
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+ if (ret) {
+ hid_err(hdev, "hw start failed\n");
+ goto err_free;
+ }
+
+ /* register led subsystem */
+ drv_data->led_state = 0;
+ for (i = 0; i < SRWS1_NUMBER_LEDS; i++)
+ drv_data->led[i] = NULL;
+
+ srws1_set_leds(hdev, 0);
+
+ name_sz = strlen(hdev->uniq) + 15;
+
+ for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
+ led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
+ if (!led) {
+ hid_err(hdev, "can't allocate memory for LED %d\n", i);
+ goto err_led;
+ }
+
+ name = (void *)(&led[1]);
+ snprintf(name, name_sz, "SRWS1::%s::RPM%d", hdev->uniq, i+1);
+ led->name = name;
+ led->brightness = 0;
+ led->max_brightness = 1;
+ led->brightness_get = srws1_led_get_brightness;
+ led->brightness_set = srws1_led_set_brightness;
+
+ drv_data->led[i] = led;
+ ret = led_classdev_register(&hdev->dev, led);
+
+ if (ret) {
+ 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++) {
+ led = drv_data->led[i];
+ drv_data->led[i] = NULL;
+ if (!led)
+ continue;
+ led_classdev_unregister(led);
+ kfree(led);
+ }
+ goto out; /* but let the driver continue without LEDs */
+ }
+ }
+out:
+ return 0;
+err_free:
+ kfree(drv_data);
+ return ret;
+}
+
+static void srws1_remove(struct hid_device *hdev)
+{
+ int i;
+ struct led_classdev *led;
+
+ struct srws1_data *drv_data = hid_get_drvdata(hdev);
+
+ if (drv_data) {
+ /* Deregister LEDs (if any) */
+ for (i = 0; i < SRWS1_NUMBER_LEDS; i++) {
+ led = drv_data->led[i];
+ drv_data->led[i] = NULL;
+ if (!led)
+ continue;
+ led_classdev_unregister(led);
+ kfree(led);
+ }
+
+ }
+
+ hid_hw_stop(hdev);
+ kfree(drv_data);
+ return;
+}
+#endif
+
static __u8 *srws1_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
@@ -118,6 +313,10 @@ MODULE_DEVICE_TABLE(hid, srws1_devices);
static struct hid_driver srws1_driver = {
.name = "srws1",
.id_table = srws1_devices,
+#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+ .probe = srws1_probe,
+ .remove = srws1_remove,
+#endif
.report_fixup = srws1_report_fixup
};

--
1.7.10.4


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