3 * Support for CX23885 analog audio capture
5 * (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com>
6 * Adapted from cx88-alsa.c
7 * (c) 2009 Steven Toth <stoth@kernellabs.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/device.h>
27 #include <linux/interrupt.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/pci.h>
32 #include <asm/delay.h>
34 #include <sound/core.h>
35 #include <sound/pcm.h>
36 #include <sound/pcm_params.h>
37 #include <sound/control.h>
38 #include <sound/initval.h>
40 #include <sound/tlv.h>
44 #include "cx23885-reg.h"
46 #define AUDIO_SRAM_CHANNEL SRAM_CH07
48 #define dprintk(level, fmt, arg...) do { \
49 if (audio_debug + 1 > level) \
50 printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg); \
53 #define dprintk_core(level, fmt, arg...) if (audio_debug >= level) \
54 printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg)
56 /****************************************************************************
57 Module global static vars
58 ****************************************************************************/
60 static unsigned int disable_analog_audio;
61 module_param(disable_analog_audio, int, 0644);
62 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
64 static unsigned int audio_debug;
65 module_param(audio_debug, int, 0644);
66 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
68 /****************************************************************************
69 Board specific funtions
70 ****************************************************************************/
72 /* Constants taken from cx88-reg.h */
73 #define AUD_INT_DN_RISCI1 (1 << 0)
74 #define AUD_INT_UP_RISCI1 (1 << 1)
75 #define AUD_INT_RDS_DN_RISCI1 (1 << 2)
76 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */
77 #define AUD_INT_UP_RISCI2 (1 << 5)
78 #define AUD_INT_RDS_DN_RISCI2 (1 << 6)
79 #define AUD_INT_DN_SYNC (1 << 12)
80 #define AUD_INT_UP_SYNC (1 << 13)
81 #define AUD_INT_RDS_DN_SYNC (1 << 14)
82 #define AUD_INT_OPC_ERR (1 << 16)
83 #define AUD_INT_BER_IRQ (1 << 20)
84 #define AUD_INT_MCHG_IRQ (1 << 21)
85 #define GP_COUNT_CONTROL_RESET 0x3
88 * BOARD Specific: Sets audio DMA
91 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
93 struct cx23885_audio_buffer *buf = chip->buf;
94 struct cx23885_dev *dev = chip->dev;
95 struct sram_channel *audio_ch =
96 &dev->sram_channels[AUDIO_SRAM_CHANNEL];
98 dprintk(1, "%s()\n", __func__);
100 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
101 cx_clear(AUD_INT_DMA_CTL, 0x11);
103 /* setup fifo + format - out channel */
104 cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
108 cx_write(AUD_INT_A_LNGTH, buf->bpl);
110 /* This is required to get good audio (1 seems to be ok) */
111 cx_write(AUD_INT_A_MODE, 1);
114 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
115 atomic_set(&chip->count, 0);
117 dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
118 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
119 chip->num_periods, buf->bpl * chip->num_periods);
121 /* Enables corresponding bits at AUD_INT_STAT */
122 cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
125 /* Clean any pending interrupt bits already set */
126 cx_write(AUDIO_INT_INT_STAT, ~0);
128 /* enable audio irqs */
129 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
132 cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
133 cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
136 cx23885_sram_channel_dump(chip->dev, audio_ch);
142 * BOARD Specific: Resets audio DMA
144 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
146 struct cx23885_dev *dev = chip->dev;
147 dprintk(1, "Stopping audio DMA\n");
150 cx_clear(AUD_INT_DMA_CTL, 0x11);
153 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
154 cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
158 cx23885_sram_channel_dump(chip->dev,
159 &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
165 * BOARD Specific: Handles audio IRQ
167 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
169 struct cx23885_audio_dev *chip = dev->audio_dev;
171 if (0 == (status & mask))
174 cx_write(AUDIO_INT_INT_STAT, status);
176 /* risc op code error */
177 if (status & AUD_INT_OPC_ERR) {
178 printk(KERN_WARNING "%s/1: Audio risc op code error\n",
180 cx_clear(AUD_INT_DMA_CTL, 0x11);
181 cx23885_sram_channel_dump(dev,
182 &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
184 if (status & AUD_INT_DN_SYNC) {
185 dprintk(1, "Downstream sync error\n");
186 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
189 /* risc1 downstream */
190 if (status & AUD_INT_DN_RISCI1) {
191 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
192 snd_pcm_period_elapsed(chip->substream);
194 /* FIXME: Any other status should deserve a special handling? */
199 static int dsp_buffer_free(struct cx23885_audio_dev *chip)
201 BUG_ON(!chip->dma_size);
203 dprintk(2, "Freeing buffer\n");
204 videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
205 videobuf_dma_free(chip->dma_risc);
206 btcx_riscmem_free(chip->pci, &chip->buf->risc);
209 chip->dma_risc = NULL;
215 /****************************************************************************
217 ****************************************************************************/
220 * Digital hardware definition
222 #define DEFAULT_FIFO_SIZE 4096
224 static struct snd_pcm_hardware snd_cx23885_digital_hw = {
225 .info = SNDRV_PCM_INFO_MMAP |
226 SNDRV_PCM_INFO_INTERLEAVED |
227 SNDRV_PCM_INFO_BLOCK_TRANSFER |
228 SNDRV_PCM_INFO_MMAP_VALID,
229 .formats = SNDRV_PCM_FMTBIT_S16_LE,
231 .rates = SNDRV_PCM_RATE_48000,
236 /* Analog audio output will be full of clicks and pops if there
237 are not exactly four lines in the SRAM FIFO buffer. */
238 .period_bytes_min = DEFAULT_FIFO_SIZE/4,
239 .period_bytes_max = DEFAULT_FIFO_SIZE/4,
242 .buffer_bytes_max = (1024*1024),
246 * audio pcm capture open callback
248 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
250 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
251 struct snd_pcm_runtime *runtime = substream->runtime;
255 printk(KERN_ERR "BUG: cx23885 can't find device struct."
256 " Can't proceed with open\n");
260 err = snd_pcm_hw_constraint_pow2(runtime, 0,
261 SNDRV_PCM_HW_PARAM_PERIODS);
265 chip->substream = substream;
267 runtime->hw = snd_cx23885_digital_hw;
269 if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
271 unsigned int bpl = chip->dev->
272 sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
273 bpl &= ~7; /* must be multiple of 8 */
274 runtime->hw.period_bytes_min = bpl;
275 runtime->hw.period_bytes_max = bpl;
280 dprintk(1, "Error opening PCM!\n");
285 * audio close callback
287 static int snd_cx23885_close(struct snd_pcm_substream *substream)
295 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
296 struct snd_pcm_hw_params *hw_params)
298 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
299 struct videobuf_dmabuf *dma;
301 struct cx23885_audio_buffer *buf;
304 if (substream->runtime->dma_area) {
305 dsp_buffer_free(chip);
306 substream->runtime->dma_area = NULL;
309 chip->period_size = params_period_bytes(hw_params);
310 chip->num_periods = params_periods(hw_params);
311 chip->dma_size = chip->period_size * params_periods(hw_params);
313 BUG_ON(!chip->dma_size);
314 BUG_ON(chip->num_periods & (chip->num_periods-1));
316 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
320 buf->bpl = chip->period_size;
323 videobuf_dma_init(dma);
324 ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
325 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
329 ret = videobuf_dma_map(&chip->pci->dev, dma);
333 ret = cx23885_risc_databuffer(chip->pci, &buf->risc, dma->sglist,
334 chip->period_size, chip->num_periods, 1);
338 /* Loop back to start of program */
339 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
340 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
341 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
344 chip->dma_risc = dma;
346 substream->runtime->dma_area = chip->dma_risc->vaddr;
347 substream->runtime->dma_bytes = chip->dma_size;
348 substream->runtime->dma_addr = 0;
360 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
363 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
365 if (substream->runtime->dma_area) {
366 dsp_buffer_free(chip);
367 substream->runtime->dma_area = NULL;
376 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
384 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
387 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
390 /* Local interrupts are already disabled by ALSA */
391 spin_lock(&chip->lock);
394 case SNDRV_PCM_TRIGGER_START:
395 err = cx23885_start_audio_dma(chip);
397 case SNDRV_PCM_TRIGGER_STOP:
398 err = cx23885_stop_audio_dma(chip);
405 spin_unlock(&chip->lock);
413 static snd_pcm_uframes_t snd_cx23885_pointer(
414 struct snd_pcm_substream *substream)
416 struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
417 struct snd_pcm_runtime *runtime = substream->runtime;
420 count = atomic_read(&chip->count);
422 return runtime->period_size * (count & (runtime->periods-1));
426 * page callback (needed for mmap)
428 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
429 unsigned long offset)
431 void *pageptr = substream->runtime->dma_area + offset;
432 return vmalloc_to_page(pageptr);
438 static struct snd_pcm_ops snd_cx23885_pcm_ops = {
439 .open = snd_cx23885_pcm_open,
440 .close = snd_cx23885_close,
441 .ioctl = snd_pcm_lib_ioctl,
442 .hw_params = snd_cx23885_hw_params,
443 .hw_free = snd_cx23885_hw_free,
444 .prepare = snd_cx23885_prepare,
445 .trigger = snd_cx23885_card_trigger,
446 .pointer = snd_cx23885_pointer,
447 .page = snd_cx23885_page,
451 * create a PCM device
453 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
459 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
462 pcm->private_data = chip;
463 strcpy(pcm->name, name);
464 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
469 /****************************************************************************
470 Basic Flow for Sound Devices
471 ****************************************************************************/
474 * Alsa Constructor - Component probe
477 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
479 struct snd_card *card;
480 struct cx23885_audio_dev *chip;
483 if (disable_analog_audio)
486 if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
487 printk(KERN_WARNING "%s(): Missing SRAM channel configuration "
488 "for analog TV Audio\n", __func__);
492 err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
493 THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
497 chip = (struct cx23885_audio_dev *) card->private_data;
499 chip->pci = dev->pci;
501 spin_lock_init(&chip->lock);
503 snd_card_set_dev(card, &dev->pci->dev);
505 err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
509 strcpy(card->driver, "CX23885");
510 sprintf(card->shortname, "Conexant CX23885");
511 sprintf(card->longname, "%s at %s", card->shortname, dev->name);
513 err = snd_card_register(card);
517 dprintk(0, "registered ALSA audio device\n");
523 printk(KERN_ERR "%s(): Failed to register analog "
524 "audio adapter\n", __func__);
532 void cx23885_audio_unregister(struct cx23885_dev *dev)
534 struct cx23885_audio_dev *chip = dev->audio_dev;
536 snd_card_free(chip->card);