*
* Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
*
+ * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
+ * - Port to work with the in-kernel driver
+ * - Several cleanups
+ *
* This driver is based on my previous au600 usb pstn audio driver
* and inherits all the copyrights
*
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
-#include <linux/moduleparam.h>
+#include <linux/module.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/control.h>
-//#include <linux/video_decoder.h>
-//#include <media/tuner.h>
#include <media/v4l2-common.h>
#include "em28xx.h"
-static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
-static int em28xx_cmd(struct em28xx *dev, int cmd, int arg);
-
-static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
- size_t size)
-{
- struct snd_pcm_runtime *runtime = subs->runtime;
- if (runtime->dma_area) {
- if (runtime->dma_bytes > size)
- return 0;
- vfree(runtime->dma_area);
- }
- runtime->dma_area = vmalloc(size);
- if (!runtime->dma_area)
- return -ENOMEM;
- runtime->dma_bytes = size;
- return 0;
-}
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "activates debug info");
-static struct snd_pcm_hardware snd_em28xx_hw_capture = {
- .info =
- SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP |
- SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
- .rate_min = 48000,
- .rate_max = 48000,
- .channels_min = 2,
- .channels_max = 2,
- .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
- .period_bytes_min = 64, //12544/2,
- .period_bytes_max = 12544,
- .periods_min = 2,
- .periods_max = 98, //12544,
-};
+#define dprintk(fmt, arg...) do { \
+ if (debug) \
+ printk(KERN_INFO "em28xx-audio %s: " fmt, \
+ __FUNCTION__, ##arg); \
+ } while (0)
-static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
-{
- int ret = 0;
- int mode;
- struct em28xx *dev = snd_pcm_substream_chip(substream);
- struct snd_pcm_runtime *runtime = substream->runtime;
- printk("opening radio device and trying to acquire exclusive lock\n");
- switch (dev->mode) {
- case TUNER_STUB_DVBC_TV:
- case TUNER_STUB_DVBT_TV:
- case TUNER_STUB_ATSC_TV:
- /* digital has no support for analog audio */
- if (ret != 0) {
- printk("device is already in use by DVB-T\n");
- return -EINVAL;
- } else {
- struct v4l2_tuner tuner;
- printk("switching device to FM mode\n");
-
- mode = TUNER_STUB_RADIO;
- memset(&tuner, 0x0, sizeof(struct v4l2_tuner));
- tuner.type = V4L2_TUNER_RADIO;
-
- /* enable GPIO for analog TV */
- dev->em28xx_gpio_control(dev, EM28XX_MODE,
- (void *)mode);
- dev->mode = mode;
- /* upload firmware */
- tuner_run_cmd(dev->tobj, TUNER_CMD_INIT, (void *)mode);
-
- /* required for devices which have kerneldriver dependencies */
-// em28xx_config(dev);
-// em28xx_config_i2c(dev);
-
- /* this is moreover to switch the decoder to FM */
- em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, &tuner);
-
- dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
- ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
- em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, 0);
- /* TODO switch to FM mode */
-
- printk("em28xx-audio: %d mode\n", mode);
- tuner_run_cmd(dev->tobj, TUNER_CMD_G_MODE, &mode);
- printk("retrieved mode from tuner: %d\n", mode);
- }
- break;
-
- case TUNER_STUB_ANALOG_TV:
- printk("em28xx-audio: device is currently in analog TV mode\n");
- /* unmute by default */
- dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
- break;
- case TUNER_STUB_RADIO:
- /* check current mode and put a hard lock onto it */
- printk
- ("em28xx-audio: device is currently in analogue FM mode\n");
- /* unmute by default here */
- dev->em28xx_write_regs(dev, 0x0f, "\x87", 1);
- ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1);
- if (ret == 0)
- printk("device is locked in fmradio mode now\n");
- break;
- default:
- printk("em28xx-audio: unhandled mode %d\n", dev->mode);
- }
-
- runtime->hw = snd_em28xx_hw_capture;
- if (dev->alt == 0 && dev->adev->users == 0) {
- int errCode;
- dev->alt = 7;
- errCode = usb_set_interface(dev->udev, 0, 7);
- printk("changing alternate number to 7\n");
- }
- dev->adev->users++;
- snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
- dev->adev->capture_pcm_substream = substream;
- runtime->private_data = dev;
- return 0;
-}
-
-static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
-{
- struct em28xx *dev = snd_pcm_substream_chip(substream);
- int amode = 0;
- dev->adev->users--;
-
- /* decrease audio reference */
- switch (dev->mode) {
- case TUNER_STUB_ANALOG_TV:
- amode = EM28XX_VIDEO;
- break;
- case TUNER_STUB_RADIO:
- amode = EM28XX_RADIO;
- break;
- default:
- printk("invalid mode: %d\n", dev->mode);
- break;
- }
-
- dev->em28xx_acquire(dev, amode, 0);
-
- if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
- printk("audio users: %d\n", dev->adev->users);
- printk("disabling audio stream!\n");
- dev->adev->shutdown = 0;
- printk("released lock\n");
- em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
- }
- return 0;
-}
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
-static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *hw_params)
+static int em28xx_isoc_audio_deinit(struct em28xx *dev)
{
- unsigned int channels, rate, format;
- int ret;
- ret =
- snd_pcm_alloc_vmalloc_buffer(substream,
- params_buffer_bytes(hw_params));
- format = params_format(hw_params);
- rate = params_rate(hw_params);
- channels = params_channels(hw_params);
- /* TODO: set up em28xx audio chip to deliver the correct audio format, current default is 48000hz multiplexed => 96000hz mono
- which shouldn't matter since analogue TV only supports mono */
- return 0;
-}
+ int i;
-static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
-{
- struct em28xx *dev = snd_pcm_substream_chip(substream);
- if (dev->adev->capture_stream == STREAM_ON) {
- em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
+ dprintk("Stopping isoc\n");
+ for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+ usb_kill_urb(dev->adev->urb[i]);
+ usb_free_urb(dev->adev->urb[i]);
+ dev->adev->urb[i] = NULL;
}
- return 0;
-}
-static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
-{
return 0;
}
-static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
- int cmd)
-{
- struct em28xx *dev = snd_pcm_substream_chip(substream);
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
- return 0;
- case SNDRV_PCM_TRIGGER_STOP:
- dev->adev->shutdown = 1;
- return 0;
- default:
- return -EINVAL;
- }
-}
-
static void em28xx_audio_isocirq(struct urb *urb)
{
- struct em28xx *dev = urb->context;
- int i;
- unsigned int oldptr;
- unsigned long flags;
- int period_elapsed = 0;
- int status;
- unsigned char *cp;
- unsigned int stride;
+ struct em28xx *dev = urb->context;
+ int i;
+ unsigned int oldptr;
+ unsigned long flags;
+ int period_elapsed = 0;
+ int status;
+ unsigned char *cp;
+ unsigned int stride;
struct snd_pcm_substream *substream;
- struct snd_pcm_runtime *runtime;
+ struct snd_pcm_runtime *runtime;
if (dev->adev->capture_pcm_substream) {
substream = dev->adev->capture_pcm_substream;
runtime = substream->runtime;
-
stride = runtime->frame_bits >> 3;
+
for (i = 0; i < urb->number_of_packets; i++) {
int length =
urb->iso_frame_desc[i].actual_length / stride;
continue;
spin_lock_irqsave(&dev->adev->slock, flags);
+
oldptr = dev->adev->hwptr_done_capture;
dev->adev->hwptr_done_capture += length;
if (dev->adev->hwptr_done_capture >=
runtime->period_size;
period_elapsed = 1;
}
+
spin_unlock_irqrestore(&dev->adev->slock, flags);
if (oldptr + length >= runtime->buffer_size) {
length * stride);
}
}
- if (period_elapsed) {
+ if (period_elapsed)
snd_pcm_period_elapsed(substream);
- }
}
urb->status = 0;
if (dev->adev->shutdown)
return;
- if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (status < 0) {
em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
status);
}
return;
}
-static int em28xx_isoc_audio_deinit(struct em28xx *dev)
-{
- int i;
- for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
- usb_kill_urb(dev->adev->urb[i]);
- usb_free_urb(dev->adev->urb[i]);
- dev->adev->urb[i] = NULL;
- }
- return 0;
-}
-
static int em28xx_init_audio_isoc(struct em28xx *dev)
{
- int i;
- int errCode;
- const int sb_size =
- EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE;
+ int i, errCode;
+ const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
+ EM28XX_AUDIO_MAX_PACKET_SIZE;
+
+ dprintk("Starting isoc transfers\n");
for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
struct urb *urb;
int j, k;
+
dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
- if (!dev->adev->transfer_buffer[i]) {
+ if (!dev->adev->transfer_buffer[i])
return -ENOMEM;
- }
+
memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
- if (urb) {
- urb->dev = dev->udev;
- urb->context = dev;
- urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
- urb->transfer_flags = URB_ISO_ASAP;
- urb->transfer_buffer = dev->adev->transfer_buffer[i];
- urb->interval = 1;
- urb->complete = em28xx_audio_isocirq;
- urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
- urb->transfer_buffer_length = sb_size;
- for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
- j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
- urb->iso_frame_desc[j].offset = k;
- urb->iso_frame_desc[j].length =
- EM28XX_AUDIO_MAX_PACKET_SIZE;
- }
- dev->adev->urb[i] = urb;
- } else {
+ if (!urb)
return -ENOMEM;
+
+ urb->dev = dev->udev;
+ urb->context = dev;
+ urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_buffer = dev->adev->transfer_buffer[i];
+ urb->interval = 1;
+ urb->complete = em28xx_audio_isocirq;
+ urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
+ urb->transfer_buffer_length = sb_size;
+
+ for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
+ j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
+ urb->iso_frame_desc[j].offset = k;
+ urb->iso_frame_desc[j].length =
+ EM28XX_AUDIO_MAX_PACKET_SIZE;
}
+ dev->adev->urb[i] = urb;
}
+
for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
if (errCode) {
em28xx_isoc_audio_deinit(dev);
+
return errCode;
}
}
+
return 0;
}
static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
{
+ dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
+ "stop" : "start");
+
switch (cmd) {
case EM28XX_CAPTURE_STREAM_EN:
if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
dev->adev->capture_stream = STREAM_OFF;
em28xx_isoc_audio_deinit(dev);
} else {
- printk
- ("An underrun occured very likely... ignoring it\n");
+ printk(KERN_ERR "An underrun very likely occurred. "
+ "Ignoring it.\n");
}
return 0;
default:
}
}
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+ size_t size)
+{
+ struct snd_pcm_runtime *runtime = subs->runtime;
+
+ dprintk("Alocating vbuffer\n");
+ if (runtime->dma_area) {
+ if (runtime->dma_bytes > size)
+ return 0;
+
+ vfree(runtime->dma_area);
+ }
+ runtime->dma_area = vmalloc(size);
+ if (!runtime->dma_area)
+ return -ENOMEM;
+
+ runtime->dma_bytes = size;
+
+ return 0;
+}
+
+static struct snd_pcm_hardware snd_em28xx_hw_capture = {
+ .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP_VALID,
+
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+
+ .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
+
+ .rate_min = 48000,
+ .rate_max = 48000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
+ .period_bytes_min = 64, /* 12544/2, */
+ .period_bytes_max = 12544,
+ .periods_min = 2,
+ .periods_max = 98, /* 12544, */
+};
+
+static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int ret = 0;
+
+ dprintk("opening device and trying to acquire exclusive lock\n");
+
+ /* Sets volume, mute, etc */
+ dev->mute = 0;
+ ret = em28xx_audio_analog_set(dev);
+ if (ret < 0)
+ goto err;
+
+ runtime->hw = snd_em28xx_hw_capture;
+ if (dev->alt == 0 && dev->adev->users == 0) {
+ int errCode;
+ dev->alt = 7;
+ errCode = usb_set_interface(dev->udev, 0, 7);
+ dprintk("changing alternate number to 7\n");
+ }
+
+ dev->adev->users++;
+
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+ dev->adev->capture_pcm_substream = substream;
+ runtime->private_data = dev;
+
+ return 0;
+err:
+ printk(KERN_ERR "Error while configuring em28xx mixer\n");
+ return ret;
+}
+
+static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+ dev->adev->users--;
+
+ dprintk("closing device\n");
+
+ dev->mute = 1;
+ em28xx_audio_analog_set(dev);
+
+ if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
+ dprintk("audio users: %d\n", dev->adev->users);
+ dprintk("disabling audio stream!\n");
+ dev->adev->shutdown = 0;
+ dprintk("released lock\n");
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
+ }
+ return 0;
+}
+
+static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ unsigned int channels, rate, format;
+ int ret;
+
+ dprintk("Setting capture parameters\n");
+
+ ret = snd_pcm_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ format = params_format(hw_params);
+ rate = params_rate(hw_params);
+ channels = params_channels(hw_params);
+
+ /* TODO: set up em28xx audio chip to deliver the correct audio format,
+ current default is 48000hz multiplexed => 96000hz mono
+ which shouldn't matter since analogue TV only supports mono */
+ return 0;
+}
+
+static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+ dprintk("Stop capture, if needed\n");
+
+ if (dev->adev->capture_stream == STREAM_ON)
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
+
+ return 0;
+}
+
+static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+ dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
+ "start": "stop");
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
+ return 0;
+ case SNDRV_PCM_TRIGGER_STOP:
+ dev->adev->shutdown = 1;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
*substream)
{
struct em28xx *dev;
+
snd_pcm_uframes_t hwptr_done;
dev = snd_pcm_substream_chip(substream);
hwptr_done = dev->adev->hwptr_done_capture;
+
return hwptr_done;
}
unsigned long offset)
{
void *pageptr = subs->runtime->dma_area + offset;
+
return vmalloc_to_page(pageptr);
}
static struct snd_pcm_ops snd_em28xx_pcm_capture = {
- .open = snd_em28xx_capture_open,
- .close = snd_em28xx_pcm_close,
- .ioctl = snd_pcm_lib_ioctl,
+ .open = snd_em28xx_capture_open,
+ .close = snd_em28xx_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_em28xx_hw_capture_params,
- .hw_free = snd_em28xx_hw_capture_free,
- .prepare = snd_em28xx_prepare,
- .trigger = snd_em28xx_capture_trigger,
- .pointer = snd_em28xx_capture_pointer,
- .page = snd_pcm_get_vmalloc_page,
+ .hw_free = snd_em28xx_hw_capture_free,
+ .prepare = snd_em28xx_prepare,
+ .trigger = snd_em28xx_capture_trigger,
+ .pointer = snd_em28xx_capture_pointer,
+ .page = snd_pcm_get_vmalloc_page,
};
static int em28xx_audio_init(struct em28xx *dev)
{
struct em28xx_audio *adev;
- struct snd_pcm *pcm;
- struct snd_card *card;
- static int devnr;
- int ret;
- int err;
- printk("em28xx-audio.c: probing for em28x1 non standard usbaudio\n");
- printk("em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
+ struct snd_pcm *pcm;
+ struct snd_card *card;
+ static int devnr;
+ int ret, err;
+
+ printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
+ "non standard usbaudio\n");
+ printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
+ "Rechberger\n");
+
adev = kzalloc(sizeof(*adev), GFP_KERNEL);
if (!adev) {
- printk("em28xx-audio.c: out of memory\n");
+ printk(KERN_ERR "em28xx-audio.c: out of memory\n");
return -1;
}
card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
strcpy(card->shortname, "Em28xx Audio");
strcpy(card->longname, "Empia Em28xx Audio");
- if ((err = snd_card_register(card)) < 0) {
+ err = snd_card_register(card);
+ if (err < 0) {
snd_card_free(card);
return -ENOMEM;
}
adev->sndcard = card;
adev->udev = dev->udev;
dev->adev = adev;
+
return 0;
}
{
if (dev == NULL)
return 0;
+
if (dev->adev) {
snd_card_free(dev->adev->sndcard);
kfree(dev->adev);
dev->adev = NULL;
}
+
return 0;
}
static struct em28xx_ops audio_ops = {
- .id = EM28XX_AUDIO,
+ .id = EM28XX_AUDIO,
.name = "Em28xx Audio Extension",
.init = em28xx_audio_init,
.fini = em28xx_audio_fini,
static int __init em28xx_alsa_register(void)
{
request_module("em28xx");
- request_module("tuner");
return em28xx_register_extension(&audio_ops);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Em28xx Audio driver");
module_init(em28xx_alsa_register);
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