V4L/DVB (3214): Calculate the saa7115 AMCLK regs instead of using fixed values

- Calculate the audio master clock registers from the actual
frequencies. This simplifies the code and it also prepares
for adding CGC2 support.
- VIDIOC_INT_AUDIO_CLOCK_FREQ now receives an u32 instead of
an enum. It is more generic and actually easier to implement.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

5 files changed, 55 insertions, 147 deletions

diff --git a/drivers/media/video/cx25840/cx25840-audio.c b/drivers/media/video/cx25840/cx25840-audio.c
index 740908f8027d..6c44bd9c1704 100644
--- a/drivers/media/video/cx25840/cx25840-audio.c
+++ b/drivers/media/video/cx25840/cx25840-audio.c
@@ -23,11 +23,13 @@
 
 #include "cx25840.h"
 
-inline static int set_audclk_freq(struct i2c_client *client,
-                                 enum v4l2_audio_clock_freq freq)
+static int set_audclk_freq(struct i2c_client *client, u32 freq)
 {
         struct cx25840_state *state = i2c_get_clientdata(client);
 
+        if (freq != 32000 && freq != 44100 && freq != 48000)
+                return -EINVAL;
+
         /* assert soft reset */
         cx25840_and_or(client, 0x810, ~0x1, 0x01);
 
@@ -38,7 +40,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
         switch (state->audio_input) {
         case AUDIO_TUNER:
                 switch (freq) {
-                case V4L2_AUDCLK_32_KHZ:
+                case 32000:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f040610);
 
@@ -51,7 +53,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
                         cx25840_write4(client, 0x90c, 0x7ff70108);
                         break;
 
-                case V4L2_AUDCLK_441_KHZ:
+                case 44100:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f040910);
 
@@ -64,7 +66,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
                         cx25840_write4(client, 0x90c, 0x596d0108);
                         break;
 
-                case V4L2_AUDCLK_48_KHZ:
+                case 48000:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f040a10);
 
@@ -84,7 +86,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
         case AUDIO_INTERN:
         case AUDIO_RADIO:
                 switch (freq) {
-                case V4L2_AUDCLK_32_KHZ:
+                case 32000:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f04081e);
 
@@ -103,7 +105,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
                         cx25840_write(client, 0x127, 0x54);
                         break;
 
-                case V4L2_AUDCLK_441_KHZ:
+                case 44100:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f040918);
 
@@ -119,7 +121,7 @@ inline static int set_audclk_freq(struct i2c_client *client,
                         cx25840_write4(client, 0x90c, 0x85730108);
                         break;
 
-                case V4L2_AUDCLK_48_KHZ:
+                case 48000:
                         /* VID_PLL and AUX_PLL */
                         cx25840_write4(client, 0x108, 0x0f040a18);
 
@@ -317,7 +319,7 @@ int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg)
         case AUDC_SET_INPUT:
                 return set_input(client, *(int *)arg);
         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
-                return set_audclk_freq(client, *(enum v4l2_audio_clock_freq *)arg);
+                return set_audclk_freq(client, *(u32 *)arg);
         case VIDIOC_G_CTRL:
                 switch (ctrl->id) {
                 case V4L2_CID_AUDIO_VOLUME:
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index 54ffae686dc9..c2c1e856aa60 100644
--- a/drivers/media/video/cx25840/cx25840-core.c
+++ b/drivers/media/video/cx25840/cx25840-core.c
@@ -802,7 +802,7 @@ static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
         i2c_set_clientdata(client, state);
         memset(state, 0, sizeof(struct cx25840_state));
         state->input = CX25840_TUNER;
-        state->audclk_freq = V4L2_AUDCLK_48_KHZ;
+        state->audclk_freq = 48000;
         state->audio_input = AUDIO_TUNER;
         state->cardtype = CARDTYPE_PVR150;
 
@@ -1008,13 +1008,7 @@ static void log_status(struct i2c_client *client)
         cx25840_info("Specified audio input:     %s\n",
                     state->audio_input == 0 ? "Tuner" : "External");
 
-        switch (state->audclk_freq) {
-        case V4L2_AUDCLK_441_KHZ: p = "44.1 kHz"; break;
-        case V4L2_AUDCLK_48_KHZ: p = "48 kHz"; break;
-        case V4L2_AUDCLK_32_KHZ: p = "32 kHz"; break;
-        default: p = "undefined";
-        }
-        cx25840_info("Specified audioclock freq: %s\n", p);
+        cx25840_info("Specified audioclock freq: %d Hz\n", state->audclk_freq);
 
         switch (pref_mode & 0xf) {
         case 0: p = "mono/language A"; break;
diff --git a/drivers/media/video/cx25840/cx25840.h b/drivers/media/video/cx25840/cx25840.h
index 40aa59f9c525..4731a19092a6 100644
--- a/drivers/media/video/cx25840/cx25840.h
+++ b/drivers/media/video/cx25840/cx25840.h
@@ -65,7 +65,7 @@ struct cx25840_state {
         enum cx25840_cardtype cardtype;
         enum cx25840_input input;
         int audio_input;
-        enum v4l2_audio_clock_freq audclk_freq;
+        u32 audclk_freq;
 };
 
 /* ----------------------------------------------------------------------- */
diff --git a/drivers/media/video/saa7115.c b/drivers/media/video/saa7115.c
index b175389d9f43..3e4e5584c5d0 100644
--- a/drivers/media/video/saa7115.c
+++ b/drivers/media/video/saa7115.c
@@ -39,6 +39,7 @@
 #include <linux/i2c.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>
+#include <asm/div64.h>
 
 MODULE_DESCRIPTION("Philips SAA7114/SAA7115 video decoder driver");
 MODULE_AUTHOR("Maxim Yevtyushkin, Kevin Thayer, Chris Kennedy, Hans Verkuil");
@@ -78,7 +79,7 @@ struct saa7115_state {
         int hue;
         int sat;
         enum v4l2_chip_ident ident;
-        enum v4l2_audio_clock_freq audclk_freq;
+        u32 audclk_freq;
 };
 
 /* ----------------------------------------------------------------------- */
@@ -469,80 +470,6 @@ static const unsigned char saa7115_init_misc[] = {
         0x00, 0x00
 };
 
-/* ============== SAA7715 AUDIO settings ============= */
-
-/* 48.0 kHz */
-static const unsigned char saa7115_cfg_48_audio[] = {
-        0x34, 0xce,
-        0x35, 0xfb,
-        0x36, 0x30,
-        0x00, 0x00
-};
-
-/* 44.1 kHz */
-static const unsigned char saa7115_cfg_441_audio[] = {
-        0x34, 0xf2,
-        0x35, 0x00,
-        0x36, 0x2d,
-        0x00, 0x00
-};
-
-/* 32.0 kHz */
-static const unsigned char saa7115_cfg_32_audio[] = {
-        0x34, 0xdf,
-        0x35, 0xa7,
-        0x36, 0x20,
-        0x00, 0x00
-};
-
-/* 48.0 kHz 60hz */
-static const unsigned char saa7115_cfg_60hz_48_audio[] = {
-        0x30, 0xcd,
-        0x31, 0x20,
-        0x32, 0x03,
-        0x00, 0x00
-};
-
-/* 48.0 kHz 50hz */
-static const unsigned char saa7115_cfg_50hz_48_audio[] = {
-        0x30, 0x00,
-        0x31, 0xc0,
-        0x32, 0x03,
-        0x00, 0x00
-};
-
-/* 44.1 kHz 60hz */
-static const unsigned char saa7115_cfg_60hz_441_audio[] = {
-        0x30, 0xbc,
-        0x31, 0xdf,
-        0x32, 0x02,
-        0x00, 0x00
-};
-
-/* 44.1 kHz 50hz */
-static const unsigned char saa7115_cfg_50hz_441_audio[] = {
-        0x30, 0x00,
-        0x31, 0x72,
-        0x32, 0x03,
-        0x00, 0x00
-};
-
-/* 32.0 kHz 60hz */
-static const unsigned char saa7115_cfg_60hz_32_audio[] = {
-        0x30, 0xde,
-        0x31, 0x15,
-        0x32, 0x02,
-        0x00, 0x00
-};
-
-/* 32.0 kHz 50hz */
-static const unsigned char saa7115_cfg_50hz_32_audio[] = {
-        0x30, 0x00,
-        0x31, 0x80,
-        0x32, 0x02,
-        0x00, 0x00
-};
-
 static int saa7115_odd_parity(u8 c)
 {
         c ^= (c >> 4);
@@ -627,40 +554,38 @@ static int saa7115_decode_wss(u8 * p)
 }
 
 
-static int saa7115_set_audio_clock_freq(struct i2c_client *client, enum v4l2_audio_clock_freq freq)
+static int saa7115_set_audio_clock_freq(struct i2c_client *client, u32 freq)
 {
         struct saa7115_state *state = i2c_get_clientdata(client);
+        u32 acpf;
+        u32 acni;
+        u32 hz;
+        u64 f;
 
         saa7115_dbg("set audio clock freq: %d\n", freq);
-        switch (freq) {
-                case V4L2_AUDCLK_32_KHZ:
-                        saa7115_writeregs(client, saa7115_cfg_32_audio);
-                        if (state->std & V4L2_STD_525_60) {
-                                saa7115_writeregs(client, saa7115_cfg_60hz_32_audio);
-                        } else {
-                                saa7115_writeregs(client, saa7115_cfg_50hz_32_audio);
-                        }
-                        break;
-                case V4L2_AUDCLK_441_KHZ:
-                        saa7115_writeregs(client, saa7115_cfg_441_audio);
-                        if (state->std & V4L2_STD_525_60) {
-                                saa7115_writeregs(client, saa7115_cfg_60hz_441_audio);
-                        } else {
-                                saa7115_writeregs(client, saa7115_cfg_50hz_441_audio);
-                        }
-                        break;
-                case V4L2_AUDCLK_48_KHZ:
-                        saa7115_writeregs(client, saa7115_cfg_48_audio);
-                        if (state->std & V4L2_STD_525_60) {
-                                saa7115_writeregs(client, saa7115_cfg_60hz_48_audio);
-                        } else {
-                                saa7115_writeregs(client, saa7115_cfg_50hz_48_audio);
-                        }
-                        break;
-                default:
-                        saa7115_dbg("invalid audio setting %d\n", freq);
-                        return -EINVAL;
-        }
+
+        /* sanity check */
+        if (freq < 32000 || freq > 48000)
+                return -EINVAL;
+
+        /* hz is the refresh rate times 100 */
+        hz = (state->std & V4L2_STD_525_60) ? 5994 : 5000;
+        /* acpf = (256 * freq) / field_frequency == (256 * 100 * freq) / hz */
+        acpf = (25600 * freq) / hz;
+        /* acni = (256 * freq * 2^23) / crystal_frequency =
+                  (freq * 2^(8+23)) / crystal_frequency =
+                  (freq << 31) / 32.11 MHz */
+        f = freq;
+        f = f << 31;
+        do_div(f, 32110000);
+        acni = f;
+
+        saa7115_write(client, 0x30, acpf & 0xff);
+        saa7115_write(client, 0x31, (acpf >> 8) & 0xff);
+        saa7115_write(client, 0x32, (acpf >> 16) & 0x03);
+        saa7115_write(client, 0x34, acni & 0xff);
+        saa7115_write(client, 0x35, (acni >> 8) & 0xff);
+        saa7115_write(client, 0x36, (acni >> 16) & 0x3f);
         state->audclk_freq = freq;
         return 0;
 }
@@ -773,24 +698,17 @@ static v4l2_std_id saa7115_get_v4lstd(struct i2c_client *client)
 static void saa7115_log_status(struct i2c_client *client)
 {
         struct saa7115_state *state = i2c_get_clientdata(client);
-        char *audfreq = "undefined";
         int reg1e, reg1f;
         int signalOk;
         int vcr;
 
-        switch (state->audclk_freq) {
-                case V4L2_AUDCLK_32_KHZ:  audfreq = "32 kHz"; break;
-                case V4L2_AUDCLK_441_KHZ: audfreq = "44.1 kHz"; break;
-                case V4L2_AUDCLK_48_KHZ:  audfreq = "48 kHz"; break;
-        }
-
-        saa7115_info("Audio frequency: %s\n", audfreq);
+        saa7115_info("Audio frequency: %d Hz\n", state->audclk_freq);
         if (client->name[6] == '4') {
                 /* status for the saa7114 */
                 reg1f = saa7115_read(client, 0x1f);
                 signalOk = (reg1f & 0xc1) == 0x81;
                 saa7115_info("Video signal:    %s\n", signalOk ? "ok" : "bad");
-                saa7115_info("Frequency:       %s\n", (reg1f & 0x20) ? "60Hz" : "50Hz");
+                saa7115_info("Frequency:       %s\n", (reg1f & 0x20) ? "60 Hz" : "50 Hz");
                 return;
         }
 
@@ -807,7 +725,7 @@ static void saa7115_log_status(struct i2c_client *client)
                 saa7115_info("Input:           Composite %d\n", state->input);
         }
         saa7115_info("Video signal:    %s\n", signalOk ? (vcr ? "VCR" : "broadcast/DVD") : "bad");
-        saa7115_info("Frequency:       %s\n", (reg1f & 0x20) ? "60Hz" : "50Hz");
+        saa7115_info("Frequency:       %s\n", (reg1f & 0x20) ? "60 Hz" : "50 Hz");
 
         switch (reg1e & 0x03) {
                 case 1:
@@ -1108,7 +1026,7 @@ static int saa7115_command(struct i2c_client *client, unsigned int cmd, void *ar
                 return saa7115_get_v4lfmt(client, (struct v4l2_format *)arg);
 
         case VIDIOC_INT_AUDIO_CLOCK_FREQ:
-                return saa7115_set_audio_clock_freq(client, *(enum v4l2_audio_clock_freq *)arg);
+                return saa7115_set_audio_clock_freq(client, *(u32 *)arg);
 
         case VIDIOC_G_TUNER:
         {
@@ -1307,7 +1225,7 @@ static int saa7115_attach(struct i2c_adapter *adapter, int address, int kind)
         state->hue = 0;
         state->sat = 64;
         state->ident = (chip_id == 4) ? V4L2_IDENT_SAA7114 : V4L2_IDENT_SAA7115;
-        state->audclk_freq = V4L2_AUDCLK_48_KHZ;
+        state->audclk_freq = 48000;
 
         saa7115_dbg("writing init values\n");
 
@@ -1317,8 +1235,7 @@ static int saa7115_attach(struct i2c_adapter *adapter, int address, int kind)
         saa7115_writeregs(client, saa7115_cfg_60hz_fullres_x);
         saa7115_writeregs(client, saa7115_cfg_60hz_fullres_y);
         saa7115_writeregs(client, saa7115_cfg_60hz_video);
-        saa7115_writeregs(client, saa7115_cfg_48_audio);
-        saa7115_writeregs(client, saa7115_cfg_60hz_48_audio);
+        saa7115_set_audio_clock_freq(client, state->audclk_freq);
         saa7115_writeregs(client, saa7115_cfg_reset_scaler);
 
         i2c_attach_client(client);
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 2f2402996409..90248d29ed0a 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -26,13 +26,6 @@
 #ifndef V4L2_COMMON_H_
 #define V4L2_COMMON_H_
 
-/* VIDIOC_INT_AUDIO_CLOCK_FREQ */
-enum v4l2_audio_clock_freq {
-        V4L2_AUDCLK_32_KHZ  = 32000,
-        V4L2_AUDCLK_441_KHZ = 44100,
-        V4L2_AUDCLK_48_KHZ  = 48000,
-};
-
 /* VIDIOC_INT_G_REGISTER and VIDIOC_INT_S_REGISTER */
 struct v4l2_register {
         u32 i2c_id;             /* I2C driver ID of the I2C chip. 0 for the I2C adapter. */
@@ -77,10 +70,12 @@ enum v4l2_chip_ident {
 /* Reset the I2C chip */
 #define VIDIOC_INT_RESET                _IO  ('d', 102)
 
-/* Set the frequency of the audio clock output.
+/* Set the frequency (in Hz) of the audio clock output.
    Used to slave an audio processor to the video decoder, ensuring that audio
-   and video remain synchronized. */
-#define VIDIOC_INT_AUDIO_CLOCK_FREQ     _IOR ('d', 103, enum v4l2_audio_clock_freq)
+   and video remain synchronized.
+   Usual values for the frequency are 48000, 44100 or 32000 Hz.
+   If the frequency is not supported, then -EINVAL is returned. */
+#define VIDIOC_INT_AUDIO_CLOCK_FREQ     _IOW ('d', 103, u32)
 
 /* Video decoders that support sliced VBI need to implement this ioctl.
    Field p of the v4l2_sliced_vbi_line struct is set to the start of the VBI