V4L/DVB (10954): Add cx231xx USB driver

Signed-off-by: Srinivasa Deevi <srinivasa.deevi@conexant.com>
[mchehab@redhat.com: Remove the Kconfig changes, to avoid git breakages]
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 581 insertions, 0 deletions

diff --git a/drivers/media/video/cx231xx/cx231xx-audio.c b/drivers/media/video/cx231xx/cx231xx-audio.c
new file mode 100644
index 000000000000..e4335e2a4103
--- /dev/null
+++ b/drivers/media/video/cx231xx/cx231xx-audio.c
@@ -0,0 +1,581 @@
+/*
+ *  Conexant Cx231xx audio extension
+ *
+ *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+ *       Based on em28xx driver
+ *
+ *
+ *  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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/init.h>
+#include <linux/sound.h>
+#include <linux/spinlock.h>
+#include <linux/soundcard.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <media/v4l2-common.h>
+#include "cx231xx.h"
+#include "cx231xx-pcb-config.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "activates debug info");
+
+#define dprintk(fmt, arg...) do {					\
+	    if (debug)							\
+		printk(KERN_INFO "cx231xx-audio %s: " fmt,		\
+				  __func__, ##arg); 		\
+	} while (0)
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+
+static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
+{
+	int i;
+
+	dprintk("Stopping isoc\n");
+
+
+	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
+        if(dev->adev.urb[i]) {
+            if (!irqs_disabled())
+			    usb_kill_urb(dev->adev.urb[i]);
+		    else
+		        usb_unlink_urb(dev->adev.urb[i]);
+
+		    usb_free_urb(dev->adev.urb[i]);
+		    dev->adev.urb[i] = NULL;
+
+            kfree(dev->adev.transfer_buffer[i]);
+		    dev->adev.transfer_buffer[i] = NULL;
+
+        }
+	}
+
+	return 0;
+}
+
+static void cx231xx_audio_isocirq(struct urb *urb)
+{
+	struct cx231xx            *dev = urb->context;
+	int                      i;
+	unsigned int             oldptr;
+	int                      period_elapsed = 0;
+	int                      status;
+	unsigned char            *cp;
+	unsigned int             stride;
+	struct snd_pcm_substream *substream;
+	struct snd_pcm_runtime   *runtime;
+
+    switch (urb->status) {
+	    case 0:             /* success */
+	    case -ETIMEDOUT:    /* NAK */
+		    break;
+	    case -ECONNRESET:   /* kill */
+	    case -ENOENT:
+	    case -ESHUTDOWN:
+		    return;
+	    default:            /* error */
+		    dprintk("urb completition error %d.\n", urb->status);
+		    break;
+	}
+
+	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;
+			cp = (unsigned char *)urb->transfer_buffer +
+			    urb->iso_frame_desc[i].offset;
+
+			if (!length)
+				continue;
+
+			oldptr = dev->adev.hwptr_done_capture;
+			if (oldptr + length >= runtime->buffer_size) {
+				unsigned int cnt =
+				    runtime->buffer_size - oldptr;
+				memcpy(runtime->dma_area + oldptr * stride, cp,
+				       cnt * stride);
+				memcpy(runtime->dma_area, cp + cnt * stride,
+				       length * stride - cnt * stride);
+			} else {
+				memcpy(runtime->dma_area + oldptr * stride, cp,
+				       length * stride);
+			}
+
+			snd_pcm_stream_lock(substream);
+
+			dev->adev.hwptr_done_capture += length;
+			if (dev->adev.hwptr_done_capture >=
+			    runtime->buffer_size)
+				dev->adev.hwptr_done_capture -=
+				    runtime->buffer_size;
+
+			dev->adev.capture_transfer_done += length;
+			if (dev->adev.capture_transfer_done >=
+			    runtime->period_size) {
+				dev->adev.capture_transfer_done -=
+				    runtime->period_size;
+				period_elapsed = 1;
+			}
+
+			snd_pcm_stream_unlock(substream);
+		}
+		if (period_elapsed)
+			snd_pcm_period_elapsed(substream);
+	}
+	urb->status = 0;
+
+	status = usb_submit_urb(urb, GFP_ATOMIC);
+	if (status < 0) {
+		cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
+			      status);
+	}
+	return;
+}
+
+static int cx231xx_init_audio_isoc(struct cx231xx *dev)
+{
+	int       i, errCode;
+	int       sb_size;
+
+    cx231xx_info("%s: Starting AUDIO transfers\n",__func__);
+
+    sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
+
+	for (i = 0; i < CX231XX_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])
+			return -ENOMEM;
+
+		memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
+		urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
+		if (!urb) {
+			cx231xx_errdev("usb_alloc_urb failed!\n");
+			for (j = 0; j < i; j++) {
+				usb_free_urb(dev->adev.urb[j]);
+				kfree(dev->adev.transfer_buffer[j]);
+			}
+			return -ENOMEM;
+		}
+
+		urb->dev = dev->udev;
+		urb->context = dev;
+		urb->pipe = usb_rcvisocpipe(dev->udev, dev->adev.end_point_addr);
+		urb->transfer_flags = URB_ISO_ASAP;
+		urb->transfer_buffer = dev->adev.transfer_buffer[i];
+		urb->interval = 1;
+		urb->complete = cx231xx_audio_isocirq;
+		urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
+		urb->transfer_buffer_length = sb_size;
+
+		for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS;
+			     j++, k += dev->adev.max_pkt_size) {
+			urb->iso_frame_desc[j].offset = k;
+			urb->iso_frame_desc[j].length =
+			    dev->adev.max_pkt_size;
+		}
+		dev->adev.urb[i] = urb;
+	}
+
+	for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
+		errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
+		if (errCode < 0) {
+			cx231xx_isoc_audio_deinit(dev);
+			return errCode;
+		}
+	}
+
+	return errCode;
+}
+
+static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
+{
+	dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON)?
+				 "stop" : "start");
+
+	switch (cmd) {
+    case CX231XX_CAPTURE_STREAM_EN:
+		if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
+			dev->adev.capture_stream = STREAM_ON;
+			cx231xx_init_audio_isoc(dev);
+		} else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
+			dev->adev.capture_stream = STREAM_OFF;
+			cx231xx_isoc_audio_deinit(dev);
+		} else {
+			cx231xx_errdev( "An underrun very likely occurred. "
+					"Ignoring it.\n");
+		}
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+					size_t size)
+{
+	struct snd_pcm_runtime *runtime = subs->runtime;
+
+	dprintk("Allocating 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_cx231xx_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_cx231xx_capture_open(struct snd_pcm_substream *substream)
+{
+	struct cx231xx *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");
+
+	if (!dev) {
+		cx231xx_errdev("BUG: cx231xx can't find device struct."
+				" Can't proceed with open\n");
+		return -ENODEV;
+	}
+
+	/* Sets volume, mute, etc */
+	dev->mute = 0;
+
+    /* set alternate setting for audio interface */
+    ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); /* 1 - 48000 samples per sec */
+    if (ret < 0) {
+        cx231xx_errdev("failed to set alternate setting !\n");
+
+        return ret;
+    }
+
+    /* inform hardware to start streaming */
+    ret = cx231xx_capture_start(dev, 1, Audio);
+
+	runtime->hw = snd_cx231xx_hw_capture;
+
+    mutex_lock(&dev->lock);
+	dev->adev.users++;
+    mutex_unlock(&dev->lock);
+
+	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_cx231xx_pcm_close(struct snd_pcm_substream *substream)
+{
+    int ret;
+	struct cx231xx *dev = snd_pcm_substream_chip(substream);
+
+
+	dprintk("closing device\n");
+
+    /* set alternate setting for audio interface */
+    ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); /* 1 - 48000 samples per sec */
+    if (ret < 0) {
+        cx231xx_errdev("failed to set alternate setting !\n");
+
+        return ret;
+    }
+
+    /* inform hardware to start streaming */
+    ret = cx231xx_capture_start(dev, 0, Audio);
+
+	dev->mute = 1;
+	mutex_lock(&dev->lock);
+    dev->adev.users--;
+	mutex_unlock(&dev->lock);
+
+	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");
+		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
+	}
+	return 0;
+}
+
+static int snd_cx231xx_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 cx231xx 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_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
+{
+	struct cx231xx *dev = snd_pcm_substream_chip(substream);
+
+	dprintk("Stop capture, if needed\n");
+
+	if (dev->adev.capture_stream == STREAM_ON)
+		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
+
+	return 0;
+}
+
+static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
+{
+	return 0;
+}
+
+static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
+				      int cmd)
+{
+	struct cx231xx *dev = snd_pcm_substream_chip(substream);
+    int retval;
+
+
+	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
+				       "start": "stop");
+
+    spin_lock(&dev->adev.slock);
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_START_AUDIO);
+		retval = 0;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+        cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
+		retval = 0;
+        break;
+	default:
+		retval = -EINVAL;
+	}
+
+    spin_unlock(&dev->adev.slock);
+	return retval;
+}
+
+static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
+						    *substream)
+{
+	struct cx231xx *dev;
+    unsigned long flags;
+	snd_pcm_uframes_t hwptr_done;
+
+	dev = snd_pcm_substream_chip(substream);
+
+    spin_lock_irqsave(&dev->adev.slock, flags);
+	hwptr_done = dev->adev.hwptr_done_capture;
+    spin_unlock_irqrestore(&dev->adev.slock, flags);
+
+	return hwptr_done;
+}
+
+static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
+					     unsigned long offset)
+{
+	void *pageptr = subs->runtime->dma_area + offset;
+
+	return vmalloc_to_page(pageptr);
+}
+
+static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
+	.open      = snd_cx231xx_capture_open,
+	.close     = snd_cx231xx_pcm_close,
+	.ioctl     = snd_pcm_lib_ioctl,
+	.hw_params = snd_cx231xx_hw_capture_params,
+	.hw_free   = snd_cx231xx_hw_capture_free,
+	.prepare   = snd_cx231xx_prepare,
+	.trigger   = snd_cx231xx_capture_trigger,
+	.pointer   = snd_cx231xx_capture_pointer,
+	.page      = snd_pcm_get_vmalloc_page,
+};
+
+static int cx231xx_audio_init(struct cx231xx *dev)
+{
+	struct cx231xx_audio *adev = &dev->adev;
+	struct snd_pcm      *pcm;
+	struct snd_card     *card;
+	static int          devnr;
+	int                 err;
+    struct usb_interface *uif;
+    int i, isoc_pipe = 0;
+
+	if (dev->has_alsa_audio != 1) {
+		/* This device does not support the extension (in this case
+		   the device is expecting the snd-usb-audio module or
+		   doesn't have analog audio support at all) */
+		return 0;
+	}
+
+	cx231xx_info("cx231xx-audio.c: probing for cx231xx "
+			 "non standard usbaudio\n");
+
+	card = snd_card_new(index[devnr], "Cx231xx Audio", THIS_MODULE, 0);
+	if (card == NULL) {
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&adev->slock);
+	err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
+	if (err < 0) {
+		snd_card_free(card);
+		return err;
+	}
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx231xx_pcm_capture);
+	pcm->info_flags = 0;
+	pcm->private_data = dev;
+	strcpy(pcm->name, "Conexant cx231xx Capture");
+	strcpy(card->driver, "Conexant cx231xx Audio");
+	strcpy(card->shortname, "Cx231xx Audio");
+	strcpy(card->longname, "Conexant cx231xx Audio");
+
+	err = snd_card_register(card);
+	if (err < 0) {
+		snd_card_free(card);
+		return err;
+	}
+	adev->sndcard = card;
+	adev->udev = dev->udev;
+
+    /* compute alternate max packet sizes for Audio */
+    uif = dev->udev->actconfig->interface[dev->current_pcb_config.hs_config_info[0].interface_info.audio_index+1];
+
+    adev->end_point_addr = le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.bEndpointAddress);
+
+    adev->num_alt = uif->num_altsetting;
+    cx231xx_info(": EndPoint Addr 0x%x, Alternate settings: %i\n", adev->end_point_addr,
+                                    adev->num_alt);
+    adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
+
+    if (adev->alt_max_pkt_size == NULL) {
+        cx231xx_errdev("out of memory!\n");
+        return -ENOMEM;
+    }
+
+    for (i = 0; i < adev->num_alt ; i++) {
+        u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
+					        wMaxPacketSize);
+        adev->alt_max_pkt_size[i] =
+            (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
+        cx231xx_info("Alternate setting %i, max size= %i\n", i,
+				        adev->alt_max_pkt_size[i]);
+    }
+
+	return 0;
+}
+
+static int cx231xx_audio_fini(struct cx231xx *dev)
+{
+	if (dev == NULL)
+		return 0;
+
+	if (dev->has_alsa_audio != 1) {
+		/* This device does not support the extension (in this case
+		   the device is expecting the snd-usb-audio module or
+		   doesn't have analog audio support at all) */
+		return 0;
+	}
+
+	if (dev->adev.sndcard) {
+		snd_card_free(dev->adev.sndcard);
+        kfree(dev->adev.alt_max_pkt_size);
+		dev->adev.sndcard = NULL;
+	}
+
+	return 0;
+}
+
+static struct cx231xx_ops audio_ops = {
+    .id   = CX231XX_AUDIO,
+	.name = "Cx231xx Audio Extension",
+	.init = cx231xx_audio_init,
+	.fini = cx231xx_audio_fini,
+};
+
+static int __init cx231xx_alsa_register(void)
+{
+	return cx231xx_register_extension(&audio_ops);
+}
+
+static void __exit cx231xx_alsa_unregister(void)
+{
+	cx231xx_unregister_extension(&audio_ops);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
+MODULE_DESCRIPTION("Cx231xx Audio driver");
+
+module_init(cx231xx_alsa_register);
+module_exit(cx231xx_alsa_unregister);