aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/cx88/cx88-dsp.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/pci/cx88/cx88-dsp.c')
-rw-r--r--drivers/media/pci/cx88/cx88-dsp.c136
1 files changed, 73 insertions, 63 deletions
diff --git a/drivers/media/pci/cx88/cx88-dsp.c b/drivers/media/pci/cx88/cx88-dsp.c
index a9907265ff66..105029088120 100644
--- a/drivers/media/pci/cx88/cx88-dsp.c
+++ b/drivers/media/pci/cx88/cx88-dsp.c
@@ -1,5 +1,4 @@
/*
- *
* Stereo and SAP detection for cx88
*
* Copyright (c) 2009 Marton Balint <cus@fazekas.hu>
@@ -13,41 +12,41 @@
* 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 "cx88.h"
+#include "cx88-reg.h"
+
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <asm/div64.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)
+ ((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. */
+/*
+ * 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
+/*
+ * 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... */
+ * calculate the proper baseband frequencies...
+ */
#define FREQ_A2M_CARRIER ((s32)(2.114516 * 32768.0))
#define FREQ_A2M_DUAL ((s32)(2.754916 * 32768.0))
@@ -71,43 +70,52 @@ 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)
+#define dprintk(level, fmt, arg...) do { \
+ if (dsp_debug >= level) \
+ printk(KERN_DEBUG pr_fmt("%s: dsp:" fmt), \
+ __func__, ##arg); \
+} while (0)
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;
+ 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 */
+ /*
+ * 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);
+ s32 coeff = 2 * int_cos(freq);
u32 i;
u64 tmp;
u32 divisor;
for (i = 0; i < N; i++) {
- s32 s = x[i] + ((s64)coeff*s_prev/32768) - s_prev2;
+ s32 s = x[i] + ((s64)coeff * s_prev / 32768) - s_prev2;
+
s_prev2 = s_prev;
s_prev = s;
}
@@ -115,17 +123,20 @@ static u32 int_goertzel(s16 x[], u32 N, u32 freq)
tmp = (s64)s_prev2 * s_prev2 + (s64)s_prev * s_prev -
(s64)coeff * s_prev2 * s_prev / 32768;
- /* XXX: N must be low enough so that N*N fits in s32.
- * Else we need two divisions. */
+ /*
+ * XXX: N must be low enough so that N*N fits in s32.
+ * Else we need two divisions.
+ */
divisor = N * N;
do_div(tmp, divisor);
- return (u32) tmp;
+ return (u32)tmp;
}
static u32 freq_magnitude(s16 x[], u32 N, u32 freq)
{
u32 sum = int_goertzel(x, N, freq);
+
return (u32)int_sqrt(sum);
}
@@ -138,7 +149,7 @@ static u32 noise_magnitude(s16 x[], u32 N, u32 freq_start, u32 freq_end)
if (N > 192) {
/* The last 192 samples are enough for noise detection */
- x += (N-192);
+ x += (N - 192);
N = 192;
}
@@ -176,8 +187,8 @@ static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)
dual_freq = FREQ_EIAJ_DUAL;
break;
default:
- printk(KERN_WARNING "%s/0: unsupported audio mode %d for %s\n",
- core->name, core->tvaudio, __func__);
+ pr_warn("unsupported audio mode %d for %s\n",
+ core->tvaudio, __func__);
return UNSET;
}
@@ -186,8 +197,9 @@ static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)
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);
+ 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;
@@ -196,20 +208,22 @@ static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)
if (core->tvaudio == WW_EIAJ) {
/* EIAJ checks may need adjustments */
- if ((carrier > max(stereo, dual)*2) &&
- (carrier < max(stereo, dual)*6) &&
+ 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 */
+ /*
+ * 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) &&
+ if ((carrier > max(stereo, dual) * 2) &&
+ (carrier < max(stereo, dual) * 8) &&
(carrier > 20 && carrier < 200) &&
(noise < 10) &&
- (max(stereo, dual) > min(stereo, dual)*2)) {
+ (max(stereo, dual) > min(stereo, dual) * 2)) {
return ret;
}
}
@@ -222,8 +236,9 @@ static s32 detect_btsc(struct cx88_core *core, s16 x[], u32 N)
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);
+
+ 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;
}
@@ -234,36 +249,31 @@ static s16 *read_rds_samples(struct cx88_core *core, u32 *N)
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);
+ 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,
+ 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);
+ samples = kmalloc_array(sample_count, sizeof(*samples), GFP_KERNEL);
if (!samples)
return NULL;
*N = sample_count;
for (i = 0; i < sample_count; i++) {
- offset = offset % (AUD_RDS_LINES*bpl);
+ 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");
- }
+ dprintk(2, "RDS samples dump: %*ph\n", sample_count, samples);
return samples;
}
@@ -310,11 +320,11 @@ s32 cx88_dsp_detect_stereo_sap(struct cx88_core *core)
kfree(samples);
- if (UNSET != ret)
+ if (ret != UNSET)
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" : "");
+ (ret & V4L2_TUNER_SUB_MONO) ? " mono" : "",
+ (ret & V4L2_TUNER_SUB_STEREO) ? " stereo" : "",
+ (ret & V4L2_TUNER_SUB_LANG2) ? " dual" : "");
return ret;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.