[alsa-devel] [PATCH 7/7] ALSA: line6/toneport: Implement LED controls via LED class
Takashi Iwai
tiwai at suse.de
Tue Jan 20 10:04:22 CET 2015
Instead of non-standard sysfs, reimplement the LED controls on
TonePort as LED class devices.
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
sound/usb/line6/Kconfig | 2 +
sound/usb/line6/toneport.c | 163 +++++++++++++++++++++++++--------------------
2 files changed, 91 insertions(+), 74 deletions(-)
diff --git a/sound/usb/line6/Kconfig b/sound/usb/line6/Kconfig
index af20947e0bda..f4585d378ef3 100644
--- a/sound/usb/line6/Kconfig
+++ b/sound/usb/line6/Kconfig
@@ -29,6 +29,8 @@ config SND_USB_PODHD
config SND_USB_TONEPORT
tristate "TonePort GX, UX1 and UX2 USB support"
select SND_USB_LINE6
+ select NEW_LEDS
+ select LEDS_CLASS
help
This is a driver for TonePort GX, UX1 and UX2 devices.
diff --git a/sound/usb/line6/toneport.c b/sound/usb/line6/toneport.c
index 9a4f5403569e..9a769463f7bf 100644
--- a/sound/usb/line6/toneport.c
+++ b/sound/usb/line6/toneport.c
@@ -14,6 +14,7 @@
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/leds.h>
#include <sound/core.h>
#include <sound/control.h>
@@ -32,6 +33,15 @@ enum line6_device_type {
LINE6_TONEPORT_UX2,
};
+struct usb_line6_toneport;
+
+struct toneport_led {
+ struct led_classdev dev;
+ char name[64];
+ struct usb_line6_toneport *toneport;
+ bool registered;
+};
+
struct usb_line6_toneport {
/**
Generic Line 6 USB data.
@@ -62,6 +72,9 @@ struct usb_line6_toneport {
Device type.
*/
enum line6_device_type type;
+
+ /* LED instances */
+ struct toneport_led leds[2];
};
static int toneport_send_cmd(struct usb_device *usbdev, int cmd1, int cmd2);
@@ -117,15 +130,6 @@ static struct line6_pcm_properties toneport_pcm_properties = {
.bytes_per_frame = 4
};
-/*
- For the led on Guitarport.
- Brightness goes from 0x00 to 0x26. Set a value above this to have led
- blink.
- (void cmd_0x02(byte red, byte green)
-*/
-static int led_red = 0x00;
-static int led_green = 0x26;
-
static const struct {
const char *name;
int code;
@@ -136,62 +140,6 @@ static const struct {
{"Inst & Mic", 0x0901}
};
-static bool toneport_has_led(enum line6_device_type type)
-{
- return
- (type == LINE6_GUITARPORT) ||
- (type == LINE6_TONEPORT_GX);
- /* add your device here if you are missing support for the LEDs */
-}
-
-static void toneport_update_led(struct device *dev)
-{
- struct usb_interface *interface = to_usb_interface(dev);
- struct usb_line6_toneport *tp = usb_get_intfdata(interface);
- struct usb_line6 *line6;
-
- if (!tp)
- return;
-
- line6 = &tp->line6;
- if (line6)
- toneport_send_cmd(line6->usbdev, (led_red << 8) | 0x0002,
- led_green);
-}
-
-static ssize_t toneport_set_led_red(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- int retval;
-
- retval = kstrtoint(buf, 10, &led_red);
- if (retval)
- return retval;
-
- toneport_update_led(dev);
- return count;
-}
-
-static ssize_t toneport_set_led_green(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- int retval;
-
- retval = kstrtoint(buf, 10, &led_green);
- if (retval)
- return retval;
-
- toneport_update_led(dev);
- return count;
-}
-
-static DEVICE_ATTR(led_red, S_IWUSR | S_IRUGO, line6_nop_read,
- toneport_set_led_red);
-static DEVICE_ATTR(led_green, S_IWUSR | S_IRUGO, line6_nop_read,
- toneport_set_led_green);
-
static int toneport_send_cmd(struct usb_device *usbdev, int cmd1, int cmd2)
{
int ret;
@@ -330,6 +278,78 @@ static struct snd_kcontrol_new toneport_control_source = {
};
/*
+ For the led on Guitarport.
+ Brightness goes from 0x00 to 0x26. Set a value above this to have led
+ blink.
+ (void cmd_0x02(byte red, byte green)
+*/
+
+static bool toneport_has_led(enum line6_device_type type)
+{
+ return
+ (type == LINE6_GUITARPORT) ||
+ (type == LINE6_TONEPORT_GX);
+ /* add your device here if you are missing support for the LEDs */
+}
+
+static const char * const led_colors[2] = { "red", "green" };
+static const int led_init_vals[2] = { 0x00, 0x26 };
+
+static void toneport_update_led(struct usb_line6_toneport *toneport)
+{
+ toneport_send_cmd(toneport->line6.usbdev,
+ (toneport->leds[0].dev.brightness << 8) | 0x0002,
+ toneport->leds[1].dev.brightness);
+}
+
+static void toneport_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct toneport_led *leds =
+ container_of(led_cdev, struct toneport_led, dev);
+ toneport_update_led(leds->toneport);
+}
+
+static int toneport_init_leds(struct usb_line6_toneport *toneport)
+{
+ struct device *dev = &toneport->line6.usbdev->dev;
+ int i, err;
+
+ for (i = 0; i < 2; i++) {
+ struct toneport_led *led = &toneport->leds[i];
+ struct led_classdev *leddev = &led->dev;
+
+ led->toneport = toneport;
+ snprintf(led->name, sizeof(led->name), "%s::%s",
+ dev_name(dev), led_colors[i]);
+ leddev->name = led->name;
+ leddev->brightness = led_init_vals[i];
+ leddev->max_brightness = 0x26;
+ leddev->brightness_set = toneport_led_brightness_set;
+ err = led_classdev_register(dev, leddev);
+ if (err)
+ return err;
+ led->registered = true;
+ }
+
+ return 0;
+}
+
+static void toneport_remove_leds(struct usb_line6_toneport *toneport)
+{
+ struct toneport_led *led;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ led = &toneport->leds[i];
+ if (!led->registered)
+ break;
+ led_classdev_unregister(&led->dev);
+ led->registered = false;
+ }
+}
+
+/*
Setup Toneport device.
*/
static void toneport_setup(struct usb_line6_toneport *toneport)
@@ -359,7 +379,7 @@ static void toneport_setup(struct usb_line6_toneport *toneport)
}
if (toneport_has_led(toneport->type))
- toneport_update_led(&usbdev->dev);
+ toneport_update_led(toneport);
mod_timer(&toneport->timer, jiffies + TONEPORT_PCM_DELAY * HZ);
}
@@ -374,10 +394,8 @@ static void line6_toneport_disconnect(struct usb_interface *interface)
toneport = usb_get_intfdata(interface);
del_timer_sync(&toneport->timer);
- if (toneport_has_led(toneport->type)) {
- device_remove_file(&interface->dev, &dev_attr_led_red);
- device_remove_file(&interface->dev, &dev_attr_led_green);
- }
+ if (toneport_has_led(toneport->type))
+ toneport_remove_leds(toneport);
}
@@ -428,10 +446,7 @@ static int toneport_init(struct usb_interface *interface,
line6_read_data(line6, 0x80c2, &toneport->firmware_version, 1);
if (toneport_has_led(toneport->type)) {
- err = device_create_file(&interface->dev, &dev_attr_led_red);
- if (err < 0)
- return err;
- err = device_create_file(&interface->dev, &dev_attr_led_green);
+ err = toneport_init_leds(toneport);
if (err < 0)
return err;
}
--
2.2.1
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