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-rw-r--r--drivers/media/video/cx88/Makefile2
-rw-r--r--drivers/media/video/cx88/cx88-core.c26
-rw-r--r--drivers/media/video/cx88/cx88-dsp.c299
-rw-r--r--drivers/media/video/cx88/cx88-tvaudio.c54
-rw-r--r--drivers/media/video/cx88/cx88.h10
5 files changed, 381 insertions, 10 deletions
diff --git a/drivers/media/video/cx88/Makefile b/drivers/media/video/cx88/Makefile
index b06b1275a9ec..5b7e26761f0a 100644
--- a/drivers/media/video/cx88/Makefile
+++ b/drivers/media/video/cx88/Makefile
@@ -1,5 +1,5 @@
cx88xx-objs := cx88-cards.o cx88-core.o cx88-i2c.o cx88-tvaudio.o \
- cx88-input.o
+ cx88-dsp.o cx88-input.o
cx8800-objs := cx88-video.o cx88-vbi.o
cx8802-objs := cx88-mpeg.o
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index b4049de071a2..cf634606ba9a 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -231,7 +231,7 @@ cx88_free_buffer(struct videobuf_queue *q, struct cx88_buffer *buf)
* can use the whole SDRAM for the DMA fifos. To simplify things, we
* use a static memory layout. That surely will waste memory in case
* we don't use all DMA channels at the same time (which will be the
- * case most of the time). But that still gives us enougth FIFO space
+ * case most of the time). But that still gives us enough FIFO space
* to be able to deal with insane long pci latencies ...
*
* FIFO space allocations:
@@ -241,6 +241,7 @@ cx88_free_buffer(struct videobuf_queue *q, struct cx88_buffer *buf)
* channel 24 (vbi) - 4.0k
* channels 25+26 (audio) - 4.0k
* channel 28 (mpeg) - 4.0k
+ * channel 27 (audio rds)- 3.0k
* TOTAL = 29.0k
*
* Every channel has 160 bytes control data (64 bytes instruction
@@ -337,6 +338,18 @@ struct sram_channel cx88_sram_channels[] = {
.cnt1_reg = MO_DMA28_CNT1,
.cnt2_reg = MO_DMA28_CNT2,
},
+ [SRAM_CH27] = {
+ .name = "audio rds",
+ .cmds_start = 0x1801C0,
+ .ctrl_start = 0x180860,
+ .cdt = 0x180860 + 64,
+ .fifo_start = 0x187400,
+ .fifo_size = 0x000C00,
+ .ptr1_reg = MO_DMA27_PTR1,
+ .ptr2_reg = MO_DMA27_PTR2,
+ .cnt1_reg = MO_DMA27_CNT1,
+ .cnt2_reg = MO_DMA27_CNT2,
+ },
};
int cx88_sram_channel_setup(struct cx88_core *core,
@@ -598,6 +611,7 @@ int cx88_reset(struct cx88_core *core)
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH28], 188*4, 0);
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH27], 128, 0);
/* misc init ... */
cx_write(MO_INPUT_FORMAT, ((1 << 13) | // agc enable
@@ -796,6 +810,8 @@ int cx88_start_audio_dma(struct cx88_core *core)
/* constant 128 made buzz in analog Nicam-stereo for bigger fifo_size */
int bpl = cx88_sram_channels[SRAM_CH25].fifo_size/4;
+ int rds_bpl = cx88_sram_channels[SRAM_CH27].fifo_size/AUD_RDS_LINES;
+
/* If downstream RISC is enabled, bail out; ALSA is managing DMA */
if (cx_read(MO_AUD_DMACNTRL) & 0x10)
return 0;
@@ -803,12 +819,14 @@ int cx88_start_audio_dma(struct cx88_core *core)
/* setup fifo + format */
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 0);
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], bpl, 0);
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH27],
+ rds_bpl, 0);
cx_write(MO_AUDD_LNGTH, bpl); /* fifo bpl size */
- cx_write(MO_AUDR_LNGTH, bpl); /* fifo bpl size */
+ cx_write(MO_AUDR_LNGTH, rds_bpl); /* fifo bpl size */
- /* start dma */
- cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
+ /* enable Up, Down and Audio RDS fifo */
+ cx_write(MO_AUD_DMACNTRL, 0x0007);
return 0;
}
diff --git a/drivers/media/video/cx88/cx88-dsp.c b/drivers/media/video/cx88/cx88-dsp.c
new file mode 100644
index 000000000000..a78286e853c3
--- /dev/null
+++ b/drivers/media/video/cx88/cx88-dsp.c
@@ -0,0 +1,299 @@
+/*
+ *
+ * Stereo and SAP detection for cx88
+ *
+ * Copyright (c) 2009 Marton Balint <cus@fazekas.hu>
+ *
+ * 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/module.h>
+#include <linux/jiffies.h>
+
+#include "cx88.h"
+#include "cx88-reg.h"
+
+#define INT_PI ((s32)(3.141592653589 * 32768.0))
+
+#define compat_remainder(a, b) \
+ ((float)(((s32)((a)*100))%((s32)((b)*100)))/100.0)
+
+#define baseband_freq(carrier, srate, tone) ((s32)( \
+ (compat_remainder(carrier + tone, srate)) / srate * 2 * INT_PI))
+
+/* We calculate the baseband frequencies of the carrier and the pilot tones
+ * based on the the sampling rate of the audio rds fifo. */
+
+#define FREQ_A2_CARRIER baseband_freq(54687.5, 2689.36, 0.0)
+#define FREQ_A2_DUAL baseband_freq(54687.5, 2689.36, 274.1)
+#define FREQ_A2_STEREO baseband_freq(54687.5, 2689.36, 117.5)
+
+/* The frequencies below are from the reference driver. They probably need
+ * further adjustments, because they are not tested at all. You may even need
+ * to play a bit with the registers of the chip to select the proper signal
+ * for the input of the audio rds fifo, and measure it's sampling rate to
+ * calculate the proper baseband frequencies... */
+
+#define FREQ_A2M_CARRIER ((s32)(2.114516 * 32768.0))
+#define FREQ_A2M_DUAL ((s32)(2.754916 * 32768.0))
+#define FREQ_A2M_STEREO ((s32)(2.462326 * 32768.0))
+
+#define FREQ_EIAJ_CARRIER ((s32)(1.963495 * 32768.0)) /* 5pi/8 */
+#define FREQ_EIAJ_DUAL ((s32)(2.562118 * 32768.0))
+#define FREQ_EIAJ_STEREO ((s32)(2.601053 * 32768.0))
+
+#define FREQ_BTSC_DUAL ((s32)(1.963495 * 32768.0)) /* 5pi/8 */
+#define FREQ_BTSC_DUAL_REF ((s32)(1.374446 * 32768.0)) /* 7pi/16 */
+
+#define FREQ_BTSC_SAP ((s32)(2.471532 * 32768.0))
+#define FREQ_BTSC_SAP_REF ((s32)(1.730072 * 32768.0))
+
+/* The spectrum of the signal should be empty between these frequencies. */
+#define FREQ_NOISE_START ((s32)(0.100000 * 32768.0))
+#define FREQ_NOISE_END ((s32)(1.200000 * 32768.0))
+
+static unsigned int dsp_debug;
+module_param(dsp_debug, int, 0644);
+MODULE_PARM_DESC(dsp_debug, "enable audio dsp debug messages");
+
+#define dprintk(level, fmt, arg...) if (dsp_debug >= level) \
+ printk(KERN_DEBUG "%s/0: " fmt, core->name , ## arg)
+
+static s32 int_cos(u32 x)
+{
+ u32 t2, t4, t6, t8;
+ s32 ret;
+ u16 period = x / INT_PI;
+ if (period % 2)
+ return -int_cos(x - INT_PI);
+ x = x % INT_PI;
+ if (x > INT_PI/2)
+ return -int_cos(INT_PI/2 - (x % (INT_PI/2)));
+ /* Now x is between 0 and INT_PI/2.
+ * To calculate cos(x) we use it's Taylor polinom. */
+ t2 = x*x/32768/2;
+ t4 = t2*x/32768*x/32768/3/4;
+ t6 = t4*x/32768*x/32768/5/6;
+ t8 = t6*x/32768*x/32768/7/8;
+ ret = 32768-t2+t4-t6+t8;
+ return ret;
+}
+
+static u32 int_goertzel(s16 x[], u32 N, u32 freq)
+{
+ /* We use the Goertzel algorithm to determine the power of the
+ * given frequency in the signal */
+ s32 s_prev = 0;
+ s32 s_prev2 = 0;
+ s32 coeff = 2*int_cos(freq);
+ u32 i;
+ for (i = 0; i < N; i++) {
+ s32 s = x[i] + ((s64)coeff*s_prev/32768) - s_prev2;
+ s_prev2 = s_prev;
+ s_prev = s;
+ }
+ return (u32)(((s64)s_prev2*s_prev2 + (s64)s_prev*s_prev -
+ (s64)coeff*s_prev2*s_prev/32768)/N/N);
+}
+
+static u32 freq_magnitude(s16 x[], u32 N, u32 freq)
+{
+ u32 sum = int_goertzel(x, N, freq);
+ return (u32)int_sqrt(sum);
+}
+
+static u32 noise_magnitude(s16 x[], u32 N, u32 freq_start, u32 freq_end)
+{
+ int i;
+ u32 sum = 0;
+ u32 freq_step;
+ int samples = 5;
+
+ if (N > 192) {
+ /* The last 192 samples are enough for noise detection */
+ x += (N-192);
+ N = 192;
+ }
+
+ freq_step = (freq_end - freq_start) / (samples - 1);
+
+ for (i = 0; i < samples; i++) {
+ sum += int_goertzel(x, N, freq_start);
+ freq_start += freq_step;
+ }
+
+ return (u32)int_sqrt(sum / samples);
+}
+
+static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)
+{
+ s32 carrier, stereo, dual, noise;
+ s32 carrier_freq, stereo_freq, dual_freq;
+ s32 ret;
+
+ switch (core->tvaudio) {
+ case WW_BG:
+ case WW_DK:
+ carrier_freq = FREQ_A2_CARRIER;
+ stereo_freq = FREQ_A2_STEREO;
+ dual_freq = FREQ_A2_DUAL;
+ break;
+ case WW_M:
+ carrier_freq = FREQ_A2M_CARRIER;
+ stereo_freq = FREQ_A2M_STEREO;
+ dual_freq = FREQ_A2M_DUAL;
+ break;
+ case WW_EIAJ:
+ carrier_freq = FREQ_EIAJ_CARRIER;
+ stereo_freq = FREQ_EIAJ_STEREO;
+ dual_freq = FREQ_EIAJ_DUAL;
+ break;
+ default:
+ printk(KERN_WARNING "%s/0: unsupported audio mode %d for %s\n",
+ core->name, core->tvaudio, __func__);
+ return UNSET;
+ }
+
+ carrier = freq_magnitude(x, N, carrier_freq);
+ stereo = freq_magnitude(x, N, stereo_freq);
+ dual = freq_magnitude(x, N, dual_freq);
+ noise = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END);
+
+ dprintk(1, "detect a2/a2m/eiaj: carrier=%d, stereo=%d, dual=%d, "
+ "noise=%d\n", carrier, stereo, dual, noise);
+
+ if (stereo > dual)
+ ret = V4L2_TUNER_SUB_STEREO;
+ else
+ ret = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+
+ if (core->tvaudio == WW_EIAJ) {
+ /* EIAJ checks may need adjustments */
+ if ((carrier > max(stereo, dual)*2) &&
+ (carrier < max(stereo, dual)*6) &&
+ (carrier > 20 && carrier < 200) &&
+ (max(stereo, dual) > min(stereo, dual))) {
+ /* For EIAJ the carrier is always present,
+ so we probably don't need noise detection */
+ return ret;
+ }
+ } else {
+ if ((carrier > max(stereo, dual)*2) &&
+ (carrier < max(stereo, dual)*8) &&
+ (carrier > 20 && carrier < 200) &&
+ (noise < 10) &&
+ (max(stereo, dual) > min(stereo, dual)*2)) {
+ return ret;
+ }
+ }
+ return V4L2_TUNER_SUB_MONO;
+}
+
+static s32 detect_btsc(struct cx88_core *core, s16 x[], u32 N)
+{
+ s32 sap_ref = freq_magnitude(x, N, FREQ_BTSC_SAP_REF);
+ s32 sap = freq_magnitude(x, N, FREQ_BTSC_SAP);
+ s32 dual_ref = freq_magnitude(x, N, FREQ_BTSC_DUAL_REF);
+ s32 dual = freq_magnitude(x, N, FREQ_BTSC_DUAL);
+ dprintk(1, "detect btsc: dual_ref=%d, dual=%d, sap_ref=%d, sap=%d"
+ "\n", dual_ref, dual, sap_ref, sap);
+ /* FIXME: Currently not supported */
+ return UNSET;
+}
+
+static s16 *read_rds_samples(struct cx88_core *core, u32 *N)
+{
+ struct sram_channel *srch = &cx88_sram_channels[SRAM_CH27];
+ s16 *samples;
+
+ unsigned int i;
+ unsigned int bpl = srch->fifo_size/AUD_RDS_LINES;
+ unsigned int spl = bpl/4;
+ unsigned int sample_count = spl*(AUD_RDS_LINES-1);
+
+ u32 current_address = cx_read(srch->ptr1_reg);
+ u32 offset = (current_address - srch->fifo_start + bpl);
+
+ dprintk(1, "read RDS samples: current_address=%08x (offset=%08x), "
+ "sample_count=%d, aud_intstat=%08x\n", current_address,
+ current_address - srch->fifo_start, sample_count,
+ cx_read(MO_AUD_INTSTAT));
+
+ samples = kmalloc(sizeof(s16)*sample_count, GFP_KERNEL);
+ if (!samples)
+ return NULL;
+
+ *N = sample_count;
+
+ for (i = 0; i < sample_count; i++) {
+ offset = offset % (AUD_RDS_LINES*bpl);
+ samples[i] = cx_read(srch->fifo_start + offset);
+ offset += 4;
+ }
+
+ if (dsp_debug >= 2) {
+ dprintk(2, "RDS samples dump: ");
+ for (i = 0; i < sample_count; i++)
+ printk("%hd ", samples[i]);
+ printk(".\n");
+ }
+
+ return samples;
+}
+
+s32 cx88_dsp_detect_stereo_sap(struct cx88_core *core)
+{
+ s16 *samples;
+ u32 N = 0;
+ s32 ret = UNSET;
+
+ /* If audio RDS fifo is disabled, we can't read the samples */
+ if (!(cx_read(MO_AUD_DMACNTRL) & 0x04))
+ return ret;
+ if (!(cx_read(AUD_CTL) & EN_FMRADIO_EN_RDS))
+ return ret;
+
+ /* Wait at least 500 ms after an audio standard change */
+ if (time_before(jiffies, core->last_change + msecs_to_jiffies(500)))
+ return ret;
+
+ samples = read_rds_samples(core, &N);
+
+ if (!samples)
+ return ret;
+
+ switch (core->tvaudio) {
+ case WW_BG:
+ case WW_DK:
+ ret = detect_a2_a2m_eiaj(core, samples, N);
+ break;
+ case WW_BTSC:
+ ret = detect_btsc(core, samples, N);
+ break;
+ }
+
+ kfree(samples);
+
+ if (UNSET != ret)
+ dprintk(1, "stereo/sap detection result:%s%s%s\n",
+ (ret & V4L2_TUNER_SUB_MONO) ? " mono" : "",
+ (ret & V4L2_TUNER_SUB_STEREO) ? " stereo" : "",
+ (ret & V4L2_TUNER_SUB_LANG2) ? " dual" : "");
+
+ return ret;
+}
+EXPORT_SYMBOL(cx88_dsp_detect_stereo_sap);
+
diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index 7dd506b987fe..f9501eb8557c 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/drivers/media/video/cx88/cx88-tvaudio.c
@@ -163,6 +163,8 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl)
/* unmute */
volume = cx_sread(SHADOW_AUD_VOL_CTL);
cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, volume);
+
+ core->last_change = jiffies;
}
/* ----------------------------------------------------------- */
@@ -745,6 +747,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
break;
case WW_BG:
case WW_DK:
+ case WW_M:
case WW_I:
case WW_L:
/* prepare all dsp registers */
@@ -756,6 +759,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
if (0 == cx88_detect_nicam(core)) {
/* fall back to fm / am mono */
set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
+ core->audiomode_current = V4L2_TUNER_MODE_MONO;
core->use_nicam = 0;
} else {
core->use_nicam = 1;
@@ -787,6 +791,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
void cx88_newstation(struct cx88_core *core)
{
core->audiomode_manual = UNSET;
+ core->last_change = jiffies;
}
void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
@@ -805,12 +810,50 @@ void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
aud_ctl_names[cx_read(AUD_CTL) & 63]);
core->astat = reg;
-/* TODO
- Reading from AUD_STATUS is not enough
- for auto-detecting sap/dual-fm/nicam.
- Add some code here later.
-*/
+ t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP |
+ V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
+ t->rxsubchans = UNSET;
+ t->audmode = V4L2_TUNER_MODE_MONO;
+ switch (mode) {
+ case 0:
+ t->audmode = V4L2_TUNER_MODE_STEREO;
+ break;
+ case 1:
+ t->audmode = V4L2_TUNER_MODE_LANG2;
+ break;
+ case 2:
+ t->audmode = V4L2_TUNER_MODE_MONO;
+ break;
+ case 3:
+ t->audmode = V4L2_TUNER_MODE_SAP;
+ break;
+ }
+
+ switch (core->tvaudio) {
+ case WW_BTSC:
+ case WW_BG:
+ case WW_DK:
+ case WW_M:
+ case WW_EIAJ:
+ if (!core->use_nicam) {
+ t->rxsubchans = cx88_dsp_detect_stereo_sap(core);
+ break;
+ }
+ break;
+ default:
+ /* nothing */
+ break;
+ }
+
+ /* If software stereo detection is not supported... */
+ if (UNSET == t->rxsubchans) {
+ t->rxsubchans = V4L2_TUNER_SUB_MONO;
+ /* If the hardware itself detected stereo, also return
+ stereo as an available subchannel */
+ if (V4L2_TUNER_MODE_STEREO == t->audmode)
+ t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
+ }
return;
}
@@ -847,6 +890,7 @@ void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
break;
case WW_BG:
case WW_DK:
+ case WW_M:
case WW_I:
case WW_L:
if (1 == core->use_nicam) {
diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index f55e4eeed78c..9d83762163f5 100644
--- a/drivers/media/video/cx88/cx88.h
+++ b/drivers/media/video/cx88/cx88.h
@@ -65,6 +65,8 @@
#define VBI_LINE_COUNT 17
#define VBI_LINE_LENGTH 2048
+#define AUD_RDS_LINES 4
+
/* need "shadow" registers for some write-only ones ... */
#define SHADOW_AUD_VOL_CTL 1
#define SHADOW_AUD_BAL_CTL 2
@@ -132,6 +134,7 @@ struct cx88_ctrl {
#define SRAM_CH25 4 /* audio */
#define SRAM_CH26 5
#define SRAM_CH28 6 /* mpeg */
+#define SRAM_CH27 7 /* audio rds */
/* more */
struct sram_channel {
@@ -352,6 +355,7 @@ struct cx88_core {
u32 input;
u32 astat;
u32 use_nicam;
+ unsigned long last_change;
/* IR remote control state */
struct cx88_IR *ir;
@@ -654,6 +658,7 @@ extern void cx88_setup_xc3028(struct cx88_core *core, struct xc2028_ctrl *ctl);
#define WW_I2SPT 8
#define WW_FM 9
#define WW_I2SADC 10
+#define WW_M 11
void cx88_set_tvaudio(struct cx88_core *core);
void cx88_newstation(struct cx88_core *core);
@@ -667,6 +672,11 @@ struct cx8802_dev *cx8802_get_device(int minor);
struct cx8802_driver * cx8802_get_driver(struct cx8802_dev *dev, enum cx88_board_type btype);
/* ----------------------------------------------------------- */
+/* cx88-dsp.c */
+
+s32 cx88_dsp_detect_stereo_sap(struct cx88_core *core);
+
+/* ----------------------------------------------------------- */
/* cx88-input.c */
int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 19:01:10 +0100