V4L/DVB (7377): radio-sf16fmr2.c: fix volume handling

As reported by  Roel Kluin <12o3l@tiscali.nl>:
in drivers/media/radio/radio-sf16fmr2.c:319:

for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
	if ((fmr2->card_type != 11)
        	        && V4L2_CID_AUDIO_VOLUME)
	        radio_qctrl[i].step = 65535;
        ...

I don't understand this '&& V4L2_CID_AUDIO_VOLUME'

While fixing this issue, I've revisited the volume control code and fixed
CodingStyle on the changed procedures.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 39 insertions, 63 deletions

diff --git a/drivers/media/radio/radio-sf16fmr2.c b/drivers/media/radio/radio-sf16fmr2.c
index ebc5fbbc38bb..7bf7d534c042 100644
--- a/drivers/media/radio/radio-sf16fmr2.c
+++ b/drivers/media/radio/radio-sf16fmr2.c
@@ -29,6 +29,8 @@ static struct mutex lock;
 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
 
+#define AUD_VOL_INDEX 1
+
 static struct v4l2_queryctrl radio_qctrl[] = {
         {
                 .id            = V4L2_CID_AUDIO_MUTE,
@@ -37,13 +39,14 @@ static struct v4l2_queryctrl radio_qctrl[] = {
                 .maximum       = 1,
                 .default_value = 1,
                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
-        },{
+        },
+        [AUD_VOL_INDEX] = {
                 .id            = V4L2_CID_AUDIO_VOLUME,
                 .name          = "Volume",
                 .minimum       = 0,
-                .maximum       = 65535,
-                .step          = 1<<12,
-                .default_value = 0xff,
+                .maximum       = 15,
+                .step          = 1,
+                .default_value = 0,
                 .type          = V4L2_CTRL_TYPE_INTEGER,
         }
 };
@@ -61,7 +64,7 @@ static struct v4l2_queryctrl radio_qctrl[] = {
 struct fmr2_device
 {
         int port;
-        int curvol; /* 0-65535, if not volume 0 or 65535 */
+        int curvol; /* 0-15 */
         int mute;
         int stereo; /* card is producing stereo audio */
         unsigned long curfreq; /* freq in kHz */
@@ -176,51 +179,35 @@ static int fmr2_setfreq(struct fmr2_device *dev)
 /* !!! not tested, in my card this does't work !!! */
 static int fmr2_setvolume(struct fmr2_device *dev)
 {
-        int i,a,n, port = dev->port;
+        int vol[16] = { 0x021, 0x084, 0x090, 0x104,
+                        0x110, 0x204, 0x210, 0x402,
+                        0x404, 0x408, 0x410, 0x801,
+                        0x802, 0x804, 0x808, 0x810 };
+        int i, a, port = dev->port;
+        int n = vol[dev->curvol & 0x0f];
 
-        if (dev->card_type != 11) return 1;
+        if (dev->card_type != 11)
+                return 1;
 
-        switch( (dev->curvol+(1<<11)) >> 12 )
-        {
-        case 0: case 1: n = 0x21; break;
-        case 2: n = 0x84; break;
-        case 3: n = 0x90; break;
-        case 4: n = 0x104; break;
-        case 5: n = 0x110; break;
-        case 6: n = 0x204; break;
-        case 7: n = 0x210; break;
-        case 8: n = 0x402; break;
-        case 9: n = 0x404; break;
-        default:
-        case 10: n = 0x408; break;
-        case 11: n = 0x410; break;
-        case 12: n = 0x801; break;
-        case 13: n = 0x802; break;
-        case 14: n = 0x804; break;
-        case 15: n = 0x808; break;
-        case 16: n = 0x810; break;
-        }
-        for(i=12;--i>=0;)
-        {
+        for (i = 12; --i >= 0; ) {
                 a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
-                outb(a|4, port);
-                wait(4,port);
-                outb(a|0x24, port);
-                wait(4,port);
-                outb(a|4, port);
-                wait(4,port);
+                outb(a | 4, port);
+                wait(4, port);
+                outb(a | 0x24, port);
+                wait(4, port);
+                outb(a | 4, port);
+                wait(4, port);
         }
-        for(i=6;--i>=0;)
-        {
+        for (i = 6; --i >= 0; ) {
                 a = ((0x18 >> i) & 1) << 6;
-                outb(a|4, port);
+                outb(a | 4, port);
                 wait(4,port);
-                outb(a|0x24, port);
+                outb(a | 0x24, port);
                 wait(4,port);
                 outb(a|4, port);
                 wait(4,port);
         }
-        wait(4,port);
+        wait(4, port);
         outb(0x14, port);
 
         return 0;
@@ -312,16 +299,10 @@ static int vidioc_queryctrl(struct file *file, void *priv,
                                         struct v4l2_queryctrl *qc)
 {
         int i;
-        struct video_device *dev = video_devdata(file);
-        struct fmr2_device *fmr2 = dev->priv;
 
         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
-                if ((fmr2->card_type != 11)
-                                && V4L2_CID_AUDIO_VOLUME)
-                        radio_qctrl[i].step = 65535;
                 if (qc->id && qc->id == radio_qctrl[i].id) {
-                        memcpy(qc, &(radio_qctrl[i]),
-                                                sizeof(*qc));
+                        memcpy(qc, &radio_qctrl[i], sizeof(*qc));
                         return 0;
                 }
         }
@@ -354,24 +335,13 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
         switch (ctrl->id) {
         case V4L2_CID_AUDIO_MUTE:
                 fmr2->mute = ctrl->value;
-                if (fmr2->card_type != 11) {
-                        if (!fmr2->mute)
-                                fmr2->curvol = 65535;
-                        else
-                                fmr2->curvol = 0;
-                }
                 break;
         case V4L2_CID_AUDIO_VOLUME:
-                fmr2->curvol = ctrl->value;
-                if (fmr2->card_type != 11) {
-                        if (fmr2->curvol) {
-                                fmr2->curvol = 65535;
-                                fmr2->mute = 0;
-                        } else {
-                                fmr2->curvol = 0;
-                                fmr2->mute = 1;
-                        }
-                }
+                if (ctrl->value > radio_qctrl[AUD_VOL_INDEX].maximum)
+                        fmr2->curvol = radio_qctrl[AUD_VOL_INDEX].maximum;
+                else
+                        fmr2->curvol = ctrl->value;
+
                 break;
         default:
                 return -EINVAL;
@@ -387,6 +357,7 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
         mutex_lock(&lock);
         if (fmr2->curvol && !fmr2->mute) {
                 fmr2_setvolume(fmr2);
+                /* Set frequency and unmute card */
                 fmr2_setfreq(fmr2);
         } else
                 fmr2_mute(fmr2->port);
@@ -487,6 +458,11 @@ static int __init fmr2_init(void)
         fmr2_product_info(&fmr2_unit);
         mutex_unlock(&lock);
         debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
+
+        /* Only card_type == 11 implements volume */
+        if (fmr2_unit.card_type != 11)
+                radio_qctrl[AUD_VOL_INDEX].maximum = 1;
+
         return 0;
 }