[PATCH 2/2] HID: hid-lg4ff: Add support for G27 leds
From: Simon Wood
Date: Mon Apr 02 2012 - 10:54:23 EST
This patch adds supports for controlling the LED 'tachometer' on
the G27 wheel, via the LED subsystem.
The 5 LEDs are arranged from right (1=grn, 2=grn, 3=yel, 4=yel, 5=red)
and 'mirrored' to the left (10 LEDs in total).
Signed-off-by: Simon Wood <simon@xxxxxxxxxxxxx>
---
drivers/hid/hid-lg4ff.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 158 insertions(+), 1 deletions(-)
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index c3146e0..afd13ee 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -55,7 +55,8 @@ struct lg4ff_device_entry {
__u16 range;
__u16 min_range;
__u16 max_range;
- __u8 leds;
+ __u8 led_state;
+ struct led_classdev *led[5];
struct list_head list;
void (*set_range)(struct hid_device *hid, u16 range);
};
@@ -335,6 +336,92 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at
return count;
}
+static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
+{
+ struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
+ struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
+
+ report->field[0]->value[0] = 0xf8;
+ report->field[0]->value[1] = 0x12;
+ report->field[0]->value[2] = leds;
+ report->field[0]->value[3] = 0x00;
+ report->field[0]->value[4] = 0x00;
+ report->field[0]->value[5] = 0x00;
+ report->field[0]->value[6] = 0x00;
+ usbhid_submit_report(hid, report, USB_DIR_OUT);
+}
+
+static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct device *dev;
+ struct hid_device *hid;
+ struct lg4ff_device_entry *uninitialized_var(entry);
+ int i, state = 0;
+ struct lg_drv_data* drv_data;
+ dev = led_cdev->dev->parent;
+ hid = container_of(dev, struct hid_device, dev);
+ drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
+
+ if (!drv_data) {
+ hid_err(hid, "Device data not found.");
+ return;
+ }
+
+ entry = (struct lg4ff_device_entry *)drv_data->device_props;
+
+ if (!entry) {
+ hid_err(hid, "Device properties not found.");
+ return;
+ }
+
+ for (i = 0; i < 5; i++) {
+ if (led_cdev != entry->led[i])
+ continue;
+ state = (entry->led_state >> i) & 1;
+ if (value == LED_OFF && state) {
+ entry->led_state &= ~(1 << i);
+ lg4ff_set_leds(hid, entry->led_state);
+ } else if (value != LED_OFF && !state) {
+ entry->led_state |= 1 << i;
+ lg4ff_set_leds(hid, entry->led_state);
+ }
+ break;
+ }
+}
+
+static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
+{
+ struct device *dev;
+ struct hid_device *hid;
+ struct lg4ff_device_entry *uninitialized_var(entry);
+ int i, value = 0;
+ struct lg_drv_data* drv_data;
+ dev = led_cdev->dev->parent;
+ hid = container_of(dev, struct hid_device, dev);
+ drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
+
+ if (!drv_data) {
+ hid_err(hid, "Device data not found.");
+ return LED_OFF;
+ }
+
+ entry = (struct lg4ff_device_entry *)drv_data->device_props;
+
+ if (!entry) {
+ hid_err(hid, "Device properties not found.");
+ return LED_OFF;
+ }
+
+ for (i = 0; i < 5; i++)
+ if (led_cdev == entry->led[i]) {
+ value = (entry->led_state >> i) & 1;
+ break;
+ }
+
+ return value ? LED_FULL : LED_OFF;
+}
+
int lg4ff_init(struct hid_device *hid)
{
struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
@@ -347,6 +434,9 @@ int lg4ff_init(struct hid_device *hid)
struct usb_device_descriptor *udesc;
int error, i, j;
__u16 bcdDevice, rev_maj, rev_min;
+ struct led_classdev *led;
+ size_t name_sz;
+ char *name;
/* Find the report to use */
if (list_empty(report_list)) {
@@ -453,14 +543,70 @@ int lg4ff_init(struct hid_device *hid)
if (entry->set_range != NULL)
entry->set_range(hid, entry->range);
+ /* register led subsystem - G27 only */
+ entry->led_state = 0;
+ entry->led[0] = NULL;
+ entry->led[1] = NULL;
+ entry->led[2] = NULL;
+ entry->led[3] = NULL;
+ entry->led[4] = NULL;
+ entry->led[5] = NULL;
+
+ if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
+ lg4ff_set_leds(hid, 0);
+
+ name_sz = strlen(dev_name(&hid->dev)) + 8;
+
+ for (i = 0; i < 5; i++) {
+ led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
+ if (!led) {
+ hid_err(hid, "can't allocate memory for LED %d\n", i);
+ error = -ENOMEM;
+ goto err;
+ }
+
+ name = (void *)(&led[1]);
+ snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), i+1);
+ led->name = name;
+ led->brightness = 0;
+ led->max_brightness = 1;
+ led->brightness_get = lg4ff_led_get_brightness;
+ led->brightness_set = lg4ff_led_set_brightness;
+
+ entry->led[i] = led;
+ error = led_classdev_register(&hid->dev, led);
+ if (error) {
+ hid_err(hid, "failed to register LED %d. Aborting.\n", i);
+ goto err;
+ }
+ }
+
+ dbg_hid("sysfs interface created for leds\n");
+ }
+
hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@xxxxxxxxxxxxx>\n");
return 0;
+
+err:
+ /* Deregister LEDs (if any) but let the driver continue */
+ for (i = 0; i < 5; i++) {
+ led = entry->led[i];
+ entry->led[i] = NULL;
+ if (!led)
+ continue;
+ led_classdev_unregister(led);
+ kfree(led);
+ }
+
+ return 0;
}
int lg4ff_deinit(struct hid_device *hid)
{
struct lg4ff_device_entry *uninitialized_var(entry);
struct lg_drv_data *uninitialized_var(drv_data);
+ int i;
+ struct led_classdev *led;
device_remove_file(&hid->dev, &dev_attr_range);
@@ -474,6 +620,17 @@ int lg4ff_deinit(struct hid_device *hid)
hid_err(hid, "Error while deinitializing device, no device properties data.\n");
return -1;
}
+
+ /* Deregister LEDs (if any) */
+ for (i = 0; i < 5; i++) {
+ led = entry->led[i];
+ entry->led[i] = NULL;
+ if (!led)
+ continue;
+ led_classdev_unregister(led);
+ kfree(led);
+ }
+
/* Deallocate memory */
kfree(entry);
--
1.7.4.1
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