staging: line6: add Pod HD300 support

The Pod HD device family uses new MIDI SysEx messages and therefore
cannot reuse the existing Pod code. Instead of hardcoding Pod HD MIDI
messages into the driver, leave MIDI up to userspace. This driver
simply presents MIDI and pcm ALSA devices.

This device is similar to the Pod except that it has 48 kHz audio and
does not respond to Pod SysEx messages.

Signed-off-by: Stefan Hajnoczi <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/line6/Makefile

···
 		playback.o	\
 		pod.o		\
 		toneport.o	\
-		variax.o
+		variax.o	\
+		podhd.o

drivers/staging/line6/driver.c

···
 #include "midi.h"
 #include "playback.h"
 #include "pod.h"
+#include "podhd.h"
 #include "revision.h"
 #include "toneport.h"
 #include "usbdefs.h"
···
 	{USB_DEVICE(LINE6_VENDOR_ID, LINE6_DEVID_TONEPORT_UX1)},
 	{USB_DEVICE(LINE6_VENDOR_ID, LINE6_DEVID_TONEPORT_UX2)},
 	{USB_DEVICE(LINE6_VENDOR_ID, LINE6_DEVID_VARIAX)},
+	{USB_DEVICE(LINE6_VENDOR_ID, LINE6_DEVID_PODHD300)},
 	{},
 };
 
···
 	{ "TonePortGX",    "TonePort GX",      LINE6_BIT_TONEPORT_GX,   LINE6_BIT_PCM               },
 	{ "TonePortUX1",   "TonePort UX1",     LINE6_BIT_TONEPORT_UX1,  LINE6_BIT_PCM               },
 	{ "TonePortUX2",   "TonePort UX2",     LINE6_BIT_TONEPORT_UX2,  LINE6_BIT_PCM               },
-	{ "Variax",        "Variax Workbench", LINE6_BIT_VARIAX,        LINE6_BIT_CONTROL           }
+	{ "Variax",        "Variax Workbench", LINE6_BIT_VARIAX,        LINE6_BIT_CONTROL           },
+	{ "PODHD300",      "POD HD300",        LINE6_BIT_PODHD300,      LINE6_BIT_CONTROL_PCM_HWMON },
 };
 /* *INDENT-ON* */
 
···
 			line6_pod_process_message((struct usb_line6_pod *)
 						  line6);
 			break;
+
+		case LINE6_DEVID_PODHD300:
+			break; /* let userspace handle MIDI */
 
 		case LINE6_DEVID_PODXTLIVE:
 			switch (line6->interface_number) {
···
 	case LINE6_DEVID_BASSPODXTPRO:
 	case LINE6_DEVID_PODXT:
 	case LINE6_DEVID_PODXTPRO:
+	case LINE6_DEVID_PODHD300:
 		alternate = 5;
 		break;
 
···
 	case LINE6_DEVID_PODXT:
 	case LINE6_DEVID_PODXTPRO:
 		size = sizeof(struct usb_line6_pod);
+		ep_read = 0x84;
+		ep_write = 0x03;
+		break;
+
+	case LINE6_DEVID_PODHD300:
+		size = sizeof(struct usb_line6_podhd);
 		ep_read = 0x84;
 		ep_write = 0x03;
 		break;
···
 		ret = line6_pod_init(interface, (struct usb_line6_pod *)line6);
 		break;
 
+	case LINE6_DEVID_PODHD300:
+		ret = line6_podhd_init(interface,
+				       (struct usb_line6_podhd *)line6);
+		break;
+
 	case LINE6_DEVID_PODXTLIVE:
 		switch (interface_number) {
 		case PODXTLIVE_INTERFACE_POD:
···
 		case LINE6_DEVID_PODXT:
 		case LINE6_DEVID_PODXTPRO:
 			line6_pod_disconnect(interface);
+			break;
+
+		case LINE6_DEVID_PODHD300:
+			line6_podhd_disconnect(interface);
 			break;
 
 		case LINE6_DEVID_PODXTLIVE:

drivers/staging/line6/pcm.c

···
 	case LINE6_DEVID_PODXT:
 	case LINE6_DEVID_PODXTLIVE:
 	case LINE6_DEVID_PODXTPRO:
+	case LINE6_DEVID_PODHD300:
 		ep_read = 0x82;
 		ep_write = 0x01;
 		break;

drivers/staging/line6/podhd.c

···
+/*
+ * Line6 Pod HD
+ *
+ * Copyright (C) 2011 Stefan Hajnoczi <[e-mail]>
+ *
+ *	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 <sound/core.h>
+#include <sound/pcm.h>
+
+#include "audio.h"
+#include "driver.h"
+#include "pcm.h"
+#include "podhd.h"
+
+#define PODHD_BYTES_PER_FRAME 6	/* 24bit audio (stereo) */
+
+static struct snd_ratden podhd_ratden = {
+	.num_min = 48000,
+	.num_max = 48000,
+	.num_step = 1,
+	.den = 1,
+};
+
+static struct line6_pcm_properties podhd_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 |
+#ifdef CONFIG_PM
+					   SNDRV_PCM_INFO_RESUME |
+#endif
+					   SNDRV_PCM_INFO_SYNC_START),
+				  .formats = SNDRV_PCM_FMTBIT_S24_3LE,
+				  .rates = SNDRV_PCM_RATE_48000,
+				  .rate_min = 48000,
+				  .rate_max = 48000,
+				  .channels_min = 2,
+				  .channels_max = 2,
+				  .buffer_bytes_max = 60000,
+				  .period_bytes_min = 64,
+				  .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 |
+#ifdef CONFIG_PM
+					  SNDRV_PCM_INFO_RESUME |
+#endif
+					  SNDRV_PCM_INFO_SYNC_START),
+				 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
+				 .rates = SNDRV_PCM_RATE_48000,
+				 .rate_min = 48000,
+				 .rate_max = 48000,
+				 .channels_min = 2,
+				 .channels_max = 2,
+				 .buffer_bytes_max = 60000,
+				 .period_bytes_min = 64,
+				 .period_bytes_max = 8192,
+				 .periods_min = 1,
+				 .periods_max = 1024},
+	.snd_line6_rates = {
+			    .nrats = 1,
+			    .rats = &podhd_ratden},
+	.bytes_per_frame = PODHD_BYTES_PER_FRAME
+};
+
+/*
+	POD HD destructor.
+*/
+static void podhd_destruct(struct usb_interface *interface)
+{
+	struct usb_line6_podhd *podhd = usb_get_intfdata(interface);
+	struct usb_line6 *line6;
+
+	if (podhd == NULL)
+		return;
+	line6 = &podhd->line6;
+	if (line6 == NULL)
+		return;
+	line6_cleanup_audio(line6);
+}
+
+/*
+	Try to init POD HD device.
+*/
+static int podhd_try_init(struct usb_interface *interface,
+			  struct usb_line6_podhd *podhd)
+{
+	int err;
+	struct usb_line6 *line6 = &podhd->line6;
+
+	if ((interface == NULL) || (podhd == NULL))
+		return -ENODEV;
+
+	/* initialize audio system: */
+	err = line6_init_audio(line6);
+	if (err < 0)
+		return err;
+
+	/* initialize MIDI subsystem: */
+	err = line6_init_midi(line6);
+	if (err < 0)
+		return err;
+
+	/* initialize PCM subsystem: */
+	err = line6_init_pcm(line6, &podhd_pcm_properties);
+	if (err < 0)
+		return err;
+
+	/* register USB audio system: */
+	err = line6_register_audio(line6);
+	return err;
+}
+
+/*
+	Init POD HD device (and clean up in case of failure).
+*/
+int line6_podhd_init(struct usb_interface *interface,
+		     struct usb_line6_podhd *podhd)
+{
+	int err = podhd_try_init(interface, podhd);
+
+	if (err < 0)
+		podhd_destruct(interface);
+
+	return err;
+}
+
+/*
+	POD HD device disconnected.
+*/
+void line6_podhd_disconnect(struct usb_interface *interface)
+{
+	struct usb_line6_podhd *podhd;
+
+	if (interface == NULL)
+		return;
+	podhd = usb_get_intfdata(interface);
+
+	if (podhd != NULL) {
+		struct snd_line6_pcm *line6pcm = podhd->line6.line6pcm;
+
+		if (line6pcm != NULL)
+			line6_pcm_disconnect(line6pcm);
+	}
+
+	podhd_destruct(interface);
+}

drivers/staging/line6/podhd.h

···
+/*
+ * Line6 Pod HD
+ *
+ * Copyright (C) 2011 Stefan Hajnoczi <[e-mail]>
+ *
+ *	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.
+ *
+ */
+
+#ifndef PODHD_H
+#define PODHD_H
+
+#include <linux/usb.h>
+
+#include "driver.h"
+
+struct usb_line6_podhd {
+	/**
+		Generic Line6 USB data.
+	*/
+	struct usb_line6 line6;
+};
+
+extern void line6_podhd_disconnect(struct usb_interface *interface);
+extern int line6_podhd_init(struct usb_interface *interface,
+			    struct usb_line6_podhd *podhd);
+
+#endif /* PODHD_H */

drivers/staging/line6/usbdefs.h

···
 #define LINE6_DEVID_TONEPORT_UX1  0x4141
 #define LINE6_DEVID_TONEPORT_UX2  0x4142
 #define LINE6_DEVID_VARIAX        0x534d
+#define LINE6_DEVID_PODHD300      0x5057
 
 #define LINE6_BIT_BASSPODXT       (1 <<  0)
 #define LINE6_BIT_BASSPODXTLIVE   (1 <<  1)
···
 #define LINE6_BIT_TONEPORT_UX1    (1 << 14)
 #define LINE6_BIT_TONEPORT_UX2    (1 << 15)
 #define LINE6_BIT_VARIAX          (1 << 16)
+#define LINE6_BIT_PODHD300        (1 << 17)
 
 #define LINE6_BITS_PRO		(LINE6_BIT_BASSPODXTPRO | \
 				 LINE6_BIT_PODXTPRO)