Staging: add line6 usb driver

This is an experimental Linux driver for the guitar amp, cab, and
effects modeller PODxt Pro by Line6 (and similar devices), supporting
the following features:

  - Reading/writing individual parameters
  - Reading/writing complete channel, effects setup, and amp setup data
  - Channel switching
  - Virtual MIDI interface
  - Tuner access
  - Playback/capture/mixer device for any  ALSA-compatible PCM audio
    application
  - Signal routing (record clean/processed  guitar signal, re-amping)

Moreover, preliminary support for the Variax Workbench is included.

From: Markus Grabner <grabner@icg.tugraz.at>
Cc: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/staging/line6/toneport.c b/drivers/staging/line6/toneport.c
new file mode 100644
index 000000000000..c9fe07feab69
--- /dev/null
+++ b/drivers/staging/line6/toneport.c
@@ -0,0 +1,219 @@
+/*
+ * Line6 Linux USB driver - 0.8.0
+ *
+ * Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
+ *                         Emil Myhrman (emil.myhrman@gmail.com)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation, version 2.
+ *
+ */
+
+#include "driver.h"
+
+#include "audio.h"
+#include "capture.h"
+#include "playback.h"
+#include "toneport.h"
+
+
+static int toneport_send_cmd(struct usb_device *usbdev, int cmd1, int cmd2);
+
+
+static struct snd_ratden toneport_ratden = {
+	.num_min = 44100,
+	.num_max = 44100,
+	.num_step = 1,
+	.den = 1
+};
+
+static struct line6_pcm_properties toneport_pcm_properties = {
+  .snd_line6_playback_hw = {
+		.info = (SNDRV_PCM_INFO_MMAP |
+						 SNDRV_PCM_INFO_INTERLEAVED |
+						 SNDRV_PCM_INFO_BLOCK_TRANSFER |
+						 SNDRV_PCM_INFO_MMAP_VALID |
+						 SNDRV_PCM_INFO_PAUSE |
+						 SNDRV_PCM_INFO_SYNC_START),
+		.formats =          SNDRV_PCM_FMTBIT_S16_LE,
+		.rates =            SNDRV_PCM_RATE_KNOT,
+		.rate_min =         44100,
+		.rate_max =         44100,
+		.channels_min =     2,
+		.channels_max =     2,
+		.buffer_bytes_max = 60000,
+		.period_bytes_min = 180 * 4,
+		.period_bytes_max = 8192,
+		.periods_min =      1,
+		.periods_max =      1024
+	},
+  .snd_line6_capture_hw = {
+		.info = (SNDRV_PCM_INFO_MMAP |
+						 SNDRV_PCM_INFO_INTERLEAVED |
+						 SNDRV_PCM_INFO_BLOCK_TRANSFER |
+						 SNDRV_PCM_INFO_MMAP_VALID |
+						 SNDRV_PCM_INFO_SYNC_START),
+		.formats =          SNDRV_PCM_FMTBIT_S16_LE,
+		.rates =            SNDRV_PCM_RATE_KNOT,
+		.rate_min =         44100,
+		.rate_max =         44100,
+		.channels_min =     2,
+		.channels_max =     2,
+		.buffer_bytes_max = 60000,
+		.period_bytes_min = 188 * 4,
+		.period_bytes_max = 8192,
+		.periods_min =      1,
+		.periods_max =      1024
+	},
+	.snd_line6_rates = {
+		.nrats = 1,
+		.rats = &toneport_ratden
+	},
+	.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 void toneport_update_led(struct device *dev)  {
+	struct usb_interface *interface;
+	struct usb_line6_toneport *tp;
+	struct usb_line6* line6;
+
+	if ((interface = to_usb_interface(dev)) &&
+		(tp = usb_get_intfdata(interface)) &&
+		(line6 = &tp->line6))
+			toneport_send_cmd(line6->usbdev, (led_red<<8)|0x0002, led_green);	// for setting the LED on Guitarport
+}
+static ssize_t toneport_set_led_red(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count)  {
+	char* c;
+	led_red = simple_strtol(buf, &c, 10);
+	toneport_update_led(dev);
+	return count;
+}
+static ssize_t toneport_set_led_green(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count)  {
+	char* c;
+	led_green = simple_strtol(buf, &c, 10);
+	toneport_update_led(dev);
+	return count;
+}
+
+static DEVICE_ATTR(led_red, S_IWUGO | S_IRUGO, line6_nop_read, toneport_set_led_red);
+static DEVICE_ATTR(led_green, S_IWUGO | S_IRUGO, line6_nop_read, toneport_set_led_green);
+
+
+static int toneport_send_cmd(struct usb_device *usbdev, int cmd1, int cmd2)
+{
+	int ret;
+	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev,0), 0x67,
+												USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
+												cmd1, cmd2, 0, 0, LINE6_TIMEOUT * HZ);
+
+	if(ret < 0)	{
+		err("send failed (error %d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/*
+	Toneport destructor.
+*/
+static void toneport_destruct(struct usb_interface *interface)
+{
+	struct usb_line6_toneport *toneport = usb_get_intfdata(interface);
+	struct usb_line6 *line6;
+
+	if(toneport == NULL) return;
+	line6 = &toneport->line6;
+	if(line6 == NULL) return;
+	line6_cleanup_audio(line6);
+}
+
+/*
+	 Init Toneport device.
+*/
+int toneport_init(struct usb_interface *interface, struct usb_line6_toneport *toneport)
+{
+	int err, ticks;
+	struct usb_line6 *line6 = &toneport->line6;
+	struct usb_device *usbdev;
+
+	if((interface == NULL) || (toneport == NULL))
+		return -ENODEV;
+
+	/* initialize audio system: */
+	if((err = line6_init_audio(line6)) < 0) {
+		toneport_destruct(interface);
+		return err;
+	}
+
+	/* initialize PCM subsystem: */
+	if((err = line6_init_pcm(line6, &toneport_pcm_properties)) < 0) {
+		toneport_destruct(interface);
+		return err;
+	}
+
+	/* register audio system: */
+	if((err = line6_register_audio(line6)) < 0) {
+		toneport_destruct(interface);
+		return err;
+	}
+
+	usbdev = line6->usbdev;
+	line6_read_serial_number(line6, &toneport->serial_number);
+	line6_read_data(line6, 0x80c2, &toneport->firmware_version, 1);
+
+	/* sync time on device with host: */
+	ticks = (int)get_seconds();
+	line6_write_data(line6, 0x80c6, &ticks, 4);
+
+	/*
+	seems to work without the first two...
+	*/
+	//toneport_send_cmd(usbdev, 0x0201, 0x0002);  // ..
+	//toneport_send_cmd(usbdev, 0x0801, 0x0000);  // ..
+	toneport_send_cmd(usbdev, 0x0301, 0x0000);	// only one that works for me; on GP, TP might be different?
+
+	if (usbdev->descriptor.idProduct!=LINE6_DEVID_GUITARPORT) {
+		CHECK_RETURN(device_create_file(&interface->dev, &dev_attr_led_red));
+		CHECK_RETURN(device_create_file(&interface->dev, &dev_attr_led_green));
+		toneport_update_led(&usbdev->dev);
+	}
+
+	return 0;
+}
+
+/*
+	Toneport device disconnected.
+*/
+void toneport_disconnect(struct usb_interface *interface)
+{
+	struct usb_line6_toneport *toneport;
+
+	if(interface == NULL) return;
+	toneport = usb_get_intfdata(interface);
+
+	if (toneport->line6.usbdev->descriptor.idProduct != LINE6_DEVID_GUITARPORT) {
+		device_remove_file(&interface->dev, &dev_attr_led_red);
+		device_remove_file(&interface->dev, &dev_attr_led_green);
+	}
+
+	if(toneport != NULL) {
+		struct snd_line6_pcm *line6pcm = toneport->line6.line6pcm;
+
+		if(line6pcm != NULL) {
+			unlink_wait_clear_audio_out_urbs(line6pcm);
+			unlink_wait_clear_audio_in_urbs(line6pcm);
+		}
+	}
+
+	toneport_destruct(interface);
+}