/*
 * Line6 Linux USB driver - 0.9.1beta
 *
 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
 *
 *	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 <linux/slab.h>
#include <linux/wait.h>
#include <sound/control.h>

#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "playback.h"
#include "pod.h"

#define POD_SYSEX_CODE 3
#define POD_BYTES_PER_FRAME 6	/* 24bit audio (stereo) */

/* *INDENT-OFF* */

enum {
	POD_SYSEX_SAVE      = 0x24,
	POD_SYSEX_SYSTEM    = 0x56,
	POD_SYSEX_SYSTEMREQ = 0x57,
	/* POD_SYSEX_UPDATE    = 0x6c, */  /* software update! */
	POD_SYSEX_STORE     = 0x71,
	POD_SYSEX_FINISH    = 0x72,
	POD_SYSEX_DUMPMEM   = 0x73,
	POD_SYSEX_DUMP      = 0x74,
	POD_SYSEX_DUMPREQ   = 0x75

	/* dumps entire internal memory of PODxt Pro */
	/* POD_SYSEX_DUMPMEM2  = 0x76 */
};

enum {
	POD_MONITOR_LEVEL  = 0x04,
	POD_SYSTEM_INVALID = 0x10000
};

/* *INDENT-ON* */

enum {
	POD_DUMP_MEMORY = 2
};

enum {
	POD_BUSY_READ,
	POD_BUSY_WRITE,
	POD_CHANNEL_DIRTY,
	POD_SAVE_PRESSED,
	POD_BUSY_MIDISEND
};

static struct snd_ratden pod_ratden = {
	.num_min = 78125,
	.num_max = 78125,
	.num_step = 1,
	.den = 2
};

static struct line6_pcm_properties pod_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_KNOT,
				  .rate_min = 39062,
				  .rate_max = 39063,
				  .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_KNOT,
				 .rate_min = 39062,
				 .rate_max = 39063,
				 .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 = &pod_ratden},
	.bytes_per_frame = POD_BYTES_PER_FRAME
};

static const char pod_version_header[] = {
	0xf2, 0x7e, 0x7f, 0x06, 0x02
};

/* forward declarations: */
static void pod_startup2(unsigned long data);
static void pod_startup3(struct usb_line6_pod *pod);

static char *pod_alloc_sysex_buffer(struct usb_line6_pod *pod, int code,
				    int size)
{
	return line6_alloc_sysex_buffer(&pod->line6, POD_SYSEX_CODE, code,
					size);
}

/*
	Process a completely received message.
*/
void line6_pod_process_message(struct usb_line6_pod *pod)
{
	const unsigned char *buf = pod->line6.buffer_message;

	if (memcmp(buf, pod_version_header, sizeof(pod_version_header)) == 0) {
		pod->firmware_version = buf[13] * 100 + buf[14] * 10 + buf[15];
		pod->device_id = ((int)buf[8] << 16) | ((int)buf[9] << 8) |
				 (int) buf[10];
		pod_startup3(pod);
		return;
	}

	/* Only look for sysex messages from this device */
	if (buf[0] != (LINE6_SYSEX_BEGIN | LINE6_CHANNEL_DEVICE) &&
	    buf[0] != (LINE6_SYSEX_BEGIN | LINE6_CHANNEL_UNKNOWN)) {
		return;
	}
	if (memcmp(buf + 1, line6_midi_id, sizeof(line6_midi_id)) != 0)
		return;

	if (buf[5] == POD_SYSEX_SYSTEM && buf[6] == POD_MONITOR_LEVEL) {
		short value = ((int)buf[7] << 12) | ((int)buf[8] << 8) |
			      ((int)buf[9] << 4) | (int)buf[10];
		pod->monitor_level = value;
	}
}

/*
	Transmit PODxt Pro control parameter.
*/
void line6_pod_transmit_parameter(struct usb_line6_pod *pod, int param,
				  u8 value)
{
	line6_transmit_parameter(&pod->line6, param, value);
}

/*
	Send system parameter (from integer).
*/
static int pod_set_system_param_int(struct usb_line6_pod *pod, int value,
				    int code)
{
	char *sysex;
	static const int size = 5;

	sysex = pod_alloc_sysex_buffer(pod, POD_SYSEX_SYSTEM, size);
	if (!sysex)
		return -ENOMEM;
	sysex[SYSEX_DATA_OFS] = code;
	sysex[SYSEX_DATA_OFS + 1] = (value >> 12) & 0x0f;
	sysex[SYSEX_DATA_OFS + 2] = (value >> 8) & 0x0f;
	sysex[SYSEX_DATA_OFS + 3] = (value >> 4) & 0x0f;
	sysex[SYSEX_DATA_OFS + 4] = (value) & 0x0f;
	line6_send_sysex_message(&pod->line6, sysex, size);
	kfree(sysex);
	return 0;
}

/*
	"read" request on "serial_number" special file.
*/
static ssize_t serial_number_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct usb_interface *interface = to_usb_interface(dev);
	struct usb_line6_pod *pod = usb_get_intfdata(interface);

	return sprintf(buf, "%d\n", pod->serial_number);
}

/*
	"read" request on "firmware_version" special file.
*/
static ssize_t firmware_version_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct usb_interface *interface = to_usb_interface(dev);
	struct usb_line6_pod *pod = usb_get_intfdata(interface);

	return sprintf(buf, "%d.%02d\n", pod->firmware_version / 100,
		       pod->firmware_version % 100);
}

/*
	"read" request on "device_id" special file.
*/
static ssize_t device_id_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct usb_interface *interface = to_usb_interface(dev);
	struct usb_line6_pod *pod = usb_get_intfdata(interface);

	return sprintf(buf, "%d\n", pod->device_id);
}

/*
	POD startup procedure.
	This is a sequence of functions with special requirements (e.g., must
	not run immediately after initialization, must not run in interrupt
	context). After the last one has finished, the device is ready to use.
*/

static void pod_startup1(struct usb_line6_pod *pod)
{
	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_INIT);

	/* delay startup procedure: */
	line6_start_timer(&pod->startup_timer, POD_STARTUP_DELAY, pod_startup2,
			  (unsigned long)pod);
}

static void pod_startup2(unsigned long data)
{
	struct usb_line6_pod *pod = (struct usb_line6_pod *)data;
	struct usb_line6 *line6 = &pod->line6;

	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_VERSIONREQ);

	/* request firmware version: */
	line6_version_request_async(line6);
}

static void pod_startup3(struct usb_line6_pod *pod)
{
	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_WORKQUEUE);

	/* schedule work for global work queue: */
	schedule_work(&pod->startup_work);
}

static void pod_startup4(struct work_struct *work)
{
	struct usb_line6_pod *pod =
	    container_of(work, struct usb_line6_pod, startup_work);
	struct usb_line6 *line6 = &pod->line6;

	CHECK_STARTUP_PROGRESS(pod->startup_progress, POD_STARTUP_SETUP);

	/* serial number: */
	line6_read_serial_number(&pod->line6, &pod->serial_number);

	/* ALSA audio interface: */
	line6_register_audio(line6);
}

/* POD special files: */
static DEVICE_ATTR_RO(device_id);
static DEVICE_ATTR_RO(firmware_version);
static DEVICE_ATTR_RO(serial_number);

/* control info callback */
static int snd_pod_control_monitor_info(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 65535;
	return 0;
}

/* control get callback */
static int snd_pod_control_monitor_get(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	struct usb_line6_pod *pod = (struct usb_line6_pod *)line6pcm->line6;

	ucontrol->value.integer.value[0] = pod->monitor_level;
	return 0;
}

/* control put callback */
static int snd_pod_control_monitor_put(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	struct usb_line6_pod *pod = (struct usb_line6_pod *)line6pcm->line6;

	if (ucontrol->value.integer.value[0] == pod->monitor_level)
		return 0;

	pod->monitor_level = ucontrol->value.integer.value[0];
	pod_set_system_param_int(pod, ucontrol->value.integer.value[0],
				 POD_MONITOR_LEVEL);
	return 1;
}

/* control definition */
static struct snd_kcontrol_new pod_control_monitor = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Monitor Playback Volume",
	.index = 0,
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.info = snd_pod_control_monitor_info,
	.get = snd_pod_control_monitor_get,
	.put = snd_pod_control_monitor_put
};

/*
	POD destructor.
*/
static void pod_destruct(struct usb_interface *interface)
{
	struct usb_line6_pod *pod = usb_get_intfdata(interface);

	if (pod == NULL)
		return;
	line6_cleanup_audio(&pod->line6);

	del_timer(&pod->startup_timer);
	cancel_work_sync(&pod->startup_work);
}

/*
	Create sysfs entries.
*/
static int pod_create_files2(struct device *dev)
{
	int err;

	CHECK_RETURN(device_create_file(dev, &dev_attr_device_id));
	CHECK_RETURN(device_create_file(dev, &dev_attr_firmware_version));
	CHECK_RETURN(device_create_file(dev, &dev_attr_serial_number));
	return 0;
}

/*
	 Try to init POD device.
*/
static int pod_try_init(struct usb_interface *interface,
			struct usb_line6_pod *pod)
{
	int err;
	struct usb_line6 *line6 = &pod->line6;

	init_timer(&pod->startup_timer);
	INIT_WORK(&pod->startup_work, pod_startup4);

	if ((interface == NULL) || (pod == NULL))
		return -ENODEV;

	/* create sysfs entries: */
	err = pod_create_files2(&interface->dev);
	if (err < 0)
		return err;

	/* 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, &pod_pcm_properties);
	if (err < 0)
		return err;

	/* register monitor control: */
	err = snd_ctl_add(line6->card,
			  snd_ctl_new1(&pod_control_monitor, line6->line6pcm));
	if (err < 0)
		return err;

	/*
	   When the sound card is registered at this point, the PODxt Live
	   displays "Invalid Code Error 07", so we do it later in the event
	   handler.
	 */

	if (pod->line6.properties->capabilities & LINE6_BIT_CONTROL) {
		pod->monitor_level = POD_SYSTEM_INVALID;

		/* initiate startup procedure: */
		pod_startup1(pod);
	}

	return 0;
}

/*
	 Init POD device (and clean up in case of failure).
*/
int line6_pod_init(struct usb_interface *interface, struct usb_line6_pod *pod)
{
	int err = pod_try_init(interface, pod);

	if (err < 0)
		pod_destruct(interface);

	return err;
}

/*
	POD device disconnected.
*/
void line6_pod_disconnect(struct usb_interface *interface)
{
	struct usb_line6_pod *pod;

	if (interface == NULL)
		return;
	pod = usb_get_intfdata(interface);

	if (pod != NULL) {
		struct snd_line6_pcm *line6pcm = pod->line6.line6pcm;
		struct device *dev = &interface->dev;

		if (line6pcm != NULL)
			line6_pcm_disconnect(line6pcm);

		if (dev != NULL) {
			/* remove sysfs entries: */
			device_remove_file(dev, &dev_attr_device_id);
			device_remove_file(dev, &dev_attr_firmware_version);
			device_remove_file(dev, &dev_attr_serial_number);
		}
	}

	pod_destruct(interface);
}