ALSA: usb - Add boot quirk for C-Media 6206 USB Audio (92a43793) · Commits · 戴 / test

Added boot quirk for C-Media CM6206 device in snd_usb_audio_probe. The function snd_usb_cm6206_boot_quirk sets up six internal 16-bit registers in order to initialize the device. Values for the registers came from sniffing USB traffic under Windows since only four of the six are documented in the datasheet for CM106 and some reserved bits were also being set. [Minor coding-style fixes by tiwai] Signed-off-by:

Dan Allongo <gongo2k1@gmail.com> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

sound/usb/usbaudio.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -3279,6 +3279,25 @@ static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
		return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
		}

		/*
		* C-Media CM6206 is based on CM106 with two additional
		* registers that are not documented in the data sheet.
		* Values here are chosen based on sniffing USB traffic
		* under Windows.
		*/
		static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
		{
		int err, reg;
		int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};

		for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
		if (err < 0)
		return err;
		}

		return err;
		}

		/*
		* Setup quirks
		@@ -3565,6 +3584,12 @@ static void snd_usb_audio_probe(struct usb_device dev,
		goto __err_val;
		}

		/* C-Media CM6206 / CM106-Like Sound Device */
		if (id == USB_ID(0x0d8c, 0x0102)) {
		if (snd_usb_cm6206_boot_quirk(dev) < 0)
		goto __err_val;
		}

		/*
		* found a config. now register to ALSA
		*/

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