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USB: HID: Steelseries SRW-S1 Add support for LEDs 

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>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Simon Wood 2013-01-31 08:07:09 -07:00 committed by Jiri Kosina
parent 5492606dc3
commit 2e2daff3a5
2 changed files with 219 additions and 0 deletions
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20
Documentation/ABI/testing/sysfs-driver-hid-srws1 Normal file
View File

@ -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

199
drivers/hid/hid-steelseries-srws1.c
View File

@ -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 steelseries_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 steelseries_srws1_rdesc_fixed[] = {
0xC0 /* End Collection */
};
#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
static void steelseries_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 & 0xFF;
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 steelseries_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 steelseries_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);
steelseries_srws1_set_leds(hid, drv_data->led_state);
} else if (value != LED_OFF && !state) {
drv_data->led_state |= 1 << i;
steelseries_srws1_set_leds(hid, drv_data->led_state);
}
break;
}
}
static enum led_brightness steelseries_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 steelseries_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 steelseries_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 steelseries_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;
steelseries_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 = steelseries_srws1_led_get_brightness;
led->brightness_set = steelseries_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 steelseries_srws1_remove(struct hid_device *hdev)
{
int i;
struct led_classdev *led;
struct steelseries_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 *steelseries_srws1_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
@ -118,6 +313,10 @@ MODULE_DEVICE_TABLE(hid, steelseries_srws1_devices);
static struct hid_driver steelseries_srws1_driver = {
.name = "steelseries_srws1",
.id_table = steelseries_srws1_devices,
#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
.probe = steelseries_srws1_probe,
.remove = steelseries_srws1_remove,
#endif
.report_fixup = steelseries_srws1_report_fixup
};