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HID: hid-lg4ff: Add support for G27 LEDs

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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@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Simon Wood 2012-04-21 05:41:15 -07:00 committed by Jiri Kosina
parent 3b6b17b733
commit 22bcefdc88
1 changed files with 157 additions and 1 deletions
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158
drivers/hid/hid-lg4ff.c
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@ -55,7 +55,10 @@ struct lg4ff_device_entry {
__u16 range;
__u16 min_range;
__u16 max_range;
__u8 leds;
#ifdef CONFIG_LEDS_CLASS
__u8 led_state;
struct led_classdev *led[5];
#endif
struct list_head list;
void (*set_range)(struct hid_device *hid, u16 range);
};
@ -335,6 +338,88 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at
return count;
}
#ifdef CONFIG_LEDS_CLASS
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 = led_cdev->dev->parent;
struct hid_device *hid = container_of(dev, struct hid_device, dev);
struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
struct lg4ff_device_entry *entry;
int i, state = 0;
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 = led_cdev->dev->parent;
struct hid_device *hid = container_of(dev, struct hid_device, dev);
struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
struct lg4ff_device_entry *entry;
int i, value = 0;
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;
}
#endif
int lg4ff_init(struct hid_device *hid)
{
struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
@ -453,6 +538,58 @@ int lg4ff_init(struct hid_device *hid)
if (entry->set_range != NULL)
entry->set_range(hid, entry->range);
#ifdef CONFIG_LEDS_CLASS
/* register led subsystem - G27 only */
entry->led_state = 0;
for (j = 0; j < 5; j++)
entry->led[j] = NULL;
if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
struct led_classdev *led;
size_t name_sz;
char *name;
lg4ff_set_leds(hid, 0);
name_sz = strlen(dev_name(&hid->dev)) + 8;
for (j = 0; j < 5; j++) {
led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
if (!led) {
hid_err(hid, "can't allocate memory for LED %d\n", j);
goto err;
}
name = (void *)(&led[1]);
snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+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[j] = led;
error = led_classdev_register(&hid->dev, led);
if (error) {
hid_err(hid, "failed to register LED %d. Aborting.\n", j);
err:
/* Deregister LEDs (if any) */
for (j = 0; j < 5; j++) {
led = entry->led[j];
entry->led[j] = NULL;
if (!led)
continue;
led_classdev_unregister(led);
kfree(led);
}
goto out; /* Let the driver continue without LEDs */
}
}
}
#endif
out:
hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
return 0;
}
@ -474,6 +611,25 @@ int lg4ff_deinit(struct hid_device *hid)
hid_err(hid, "Error while deinitializing device, no device properties data.\n");
return -1;
}
#ifdef CONFIG_LEDS_CLASS
{
int j;
struct led_classdev *led;
/* Deregister LEDs (if any) */
for (j = 0; j < 5; j++) {
led = entry->led[j];
entry->led[j] = NULL;
if (!led)
continue;
led_classdev_unregister(led);
kfree(led);
}
}
#endif
/* Deallocate memory */
kfree(entry);