This registers 4 led devices to allow controlling the wiimote leds via standard
LED sysfs API.
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
---
drivers/hid/Kconfig | 1 +
drivers/hid/hid-wiimote.c | 130 +++++++++++++++++++++++++++++++++++++++-----
2 files changed, 116 insertions(+), 15 deletions(-)
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 306b15f..1130a89 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -589,6 +589,7 @@ config HID_WACOM_POWER_SUPPLY
config HID_WIIMOTE
tristate "Nintendo Wii Remote support"
depends on BT_HIDP
+ depends on LEDS_CLASS
---help---
Support for the Nintendo Wii Remote bluetooth device.
diff --git a/drivers/hid/hid-wiimote.c b/drivers/hid/hid-wiimote.c
index c9793c8..466d45d 100644
--- a/drivers/hid/hid-wiimote.c
+++ b/drivers/hid/hid-wiimote.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input.h>
+#include <linux/leds.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include "hid-ids.h"
@@ -35,6 +36,7 @@ struct wiimote_state {
struct wiimote_data {
struct hid_device *hdev;
struct input_dev *input;
+ struct led_classdev *leds[4];
spinlock_t qlock;
__u8 head;
@@ -52,6 +54,9 @@ struct wiimote_data {
#define WIIPROTO_FLAGS_LEDS (WIIPROTO_FLAG_LED1 | WIIPROTO_FLAG_LED2 | \
WIIPROTO_FLAG_LED3 | WIIPROTO_FLAG_LED4)
+/* return flag for led \num */
+#define WIIPROTO_FLAG_LED(num) (WIIPROTO_FLAG_LED1 << (num - 1))
+
enum wiiproto_reqs {
WIIPROTO_REQ_LED = 0x11,
WIIPROTO_REQ_DRM_K = 0x30,
@@ -191,17 +196,62 @@ static void wiiproto_req_leds(struct wiimote_data *wdata, int leds)
wiimote_queue(wdata, cmd, sizeof(cmd));
}
+static enum led_brightness wiimote_leds_get(struct led_classdev *led_dev)
+{
+ struct wiimote_data *wdata;
+ struct device *dev = led_dev->dev->parent;
+ int i;
+ unsigned long flags;
+ bool value = false;
+
+ wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));
+
+ for (i = 0; i < 4; ++i) {
+ if (wdata->leds[i] == led_dev) {
+ spin_lock_irqsave(&wdata->state.lock, flags);
+ value = wdata->state.flags & WIIPROTO_FLAG_LED(i + 1);
+ spin_unlock_irqrestore(&wdata->state.lock, flags);
+ break;
+ }
+ }
+
+ return value ? LED_FULL : LED_OFF;
+}
+
+static void wiimote_leds_set(struct led_classdev *led_dev,
+ enum led_brightness value)
+{
+ struct wiimote_data *wdata;
+ struct device *dev = led_dev->dev->parent;
+ int i;
+ unsigned long flags;
+ __u8 state, flag;
+
+ wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));
+
+ for (i = 0; i < 4; ++i) {
+ if (wdata->leds[i] == led_dev) {
+ flag = WIIPROTO_FLAG_LED(i + 1);
+ spin_lock_irqsave(&wdata->state.lock, flags);
+ state = wdata->state.flags;
+ if (value == LED_OFF)
+ wiiproto_req_leds(wdata, state & ~flag);
+ else
+ wiiproto_req_leds(wdata, state | flag);
+ spin_unlock_irqrestore(&wdata->state.lock, flags);
+ break;
+ }
+ }
+}
+
#define wiifs_led_show_set(num) \
static ssize_t wiifs_led_show_##num(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct wiimote_data *wdata = dev_to_wii(dev); \
- unsigned long flags; \
- int state; \
+ bool state; \
\
- spin_lock_irqsave(&wdata->state.lock, flags); \
- state = !!(wdata->state.flags & WIIPROTO_FLAG_LED##num); \
- spin_unlock_irqrestore(&wdata->state.lock, flags); \
+ state = !(wiimote_leds_get(wdata->leds[num - 1]) == LED_OFF); \
\
return sprintf(buf, "%d\n", state); \
} \
@@ -210,19 +260,11 @@ static ssize_t wiifs_led_set_##num(struct device *dev, \
{ \
struct wiimote_data *wdata = dev_to_wii(dev); \
int tmp = simple_strtoul(buf, NULL, 10); \
- unsigned long flags; \
- __u8 state; \
- \
- spin_lock_irqsave(&wdata->state.lock, flags); \
- \
- state = wdata->state.flags; \
\
if (tmp) \
- wiiproto_req_leds(wdata, state | WIIPROTO_FLAG_LED##num);\
+ wiimote_leds_set(wdata->leds[num - 1], LED_FULL); \
else \
- wiiproto_req_leds(wdata, state & ~WIIPROTO_FLAG_LED##num);\
- \
- spin_unlock_irqrestore(&wdata->state.lock, flags); \
+ wiimote_leds_set(wdata->leds[num - 1], LED_OFF); \
\
return count; \
} \
@@ -316,6 +358,58 @@ static int wiimote_hid_event(struct hid_device *hdev, struct hid_report *report,
return 0;
}
+static void wiimote_leds_destroy(struct wiimote_data *wdata)
+{
+ int i;
+ struct led_classdev *led;
+
+ 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 wiimote_leds_create(struct wiimote_data *wdata)
+{
+ int i, ret;
+ struct device *dev = &wdata->hdev->dev;
+ size_t namesz = strlen(dev_name(dev)) + 9;
+ struct led_classdev *led;
+ char *name;
+
+ for (i = 0; i < 4; ++i) {
+ led = kzalloc(sizeof(struct led_classdev) + namesz, GFP_KERNEL);
+ if (!led) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ name = (void*)&led[1];
+ snprintf(name, namesz, "%s:blue:p%d", dev_name(dev), i);
+ led->name = name;
+ led->brightness = 0;
+ led->max_brightness = 1;
+ led->brightness_get = wiimote_leds_get;
+ led->brightness_set = wiimote_leds_set;
+
+ ret = led_classdev_register(dev, led);
+ if (ret) {
+ kfree(led);
+ goto err;
+ }
+ wdata->leds[i] = led;
+ }
+
+ return 0;
+
+err:
+ wiimote_leds_destroy(wdata);
+ return ret;
+}
+
static struct wiimote_data *wiimote_create(struct hid_device *hdev)
{
struct wiimote_data *wdata;
@@ -359,6 +453,8 @@ static struct wiimote_data *wiimote_create(struct hid_device *hdev)
static void wiimote_destroy(struct wiimote_data *wdata)
{
+ wiimote_leds_destroy(wdata);
+
device_remove_file(&wdata->hdev->dev, &dev_attr_led1);
device_remove_file(&wdata->hdev->dev, &dev_attr_led2);
device_remove_file(&wdata->hdev->dev, &dev_attr_led3);
@@ -414,6 +510,10 @@ static int wiimote_hid_probe(struct hid_device *hdev,
if (ret)
goto err_free;
+ ret = wiimote_leds_create(wdata);
+ if (ret)
+ goto err_free;
+
hid_info(hdev, "New device registered\n");
/* by default set led1 after device initialization */
--
1.7.6
--
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