ALSA: tea575x: unify read/write functions

Implement generic read/write functions to access TEA575x tuners. They're now
implemented 4 times (once in es1968 and 3 times in fm801).
This also allows mute to work on all cards.
Also improve tuner detection/initialization.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/tea575x-tuner.h b/include/sound/tea575x-tuner.h
index 5aade56..e50cb29 100644 (file)
--- a/include/sound/tea575x-tuner.h
+++ b/include/sound/tea575x-tuner.h
@@ -26,12 +26,17 @@
 #include <media/v4l2-dev.h>
 #include <media/v4l2-ioctl.h>
 
+#define TEA575X_DATA   (1 << 0)
+#define TEA575X_CLK    (1 << 1)
+#define TEA575X_WREN   (1 << 2)
+#define TEA575X_MOST   (1 << 3)
+
 struct snd_tea575x;
 
 struct snd_tea575x_ops {
-       void (*write)(struct snd_tea575x *tea, unsigned int val);
-       unsigned int (*read)(struct snd_tea575x *tea);
-       void (*mute)(struct snd_tea575x *tea, unsigned int mute);
+       void (*set_pins)(struct snd_tea575x *tea, u8 pins);
+       u8 (*get_pins)(struct snd_tea575x *tea);
+       void (*set_direction)(struct snd_tea575x *tea, bool output);
 };
 
 struct snd_tea575x {
@@ -49,7 +54,7 @@ struct snd_tea575x {
        void *private_data;
 };
 
-void snd_tea575x_init(struct snd_tea575x *tea);
+int snd_tea575x_init(struct snd_tea575x *tea);
 void snd_tea575x_exit(struct snd_tea575x *tea);
 
 #endif /* __SOUND_TEA575X_TUNER_H */

diff --git a/sound/i2c/other/tea575x-tuner.c b/sound/i2c/other/tea575x-tuner.c
index 9f35f37..31f9795 100644 (file)
--- a/sound/i2c/other/tea575x-tuner.c
+++ b/sound/i2c/other/tea575x-tuner.c
@@ -77,11 +77,65 @@ static struct v4l2_queryctrl radio_qctrl[] = {
  * lowlevel part
  */
 
+static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
+{
+       u16 l;
+       u8 data;
+
+       tea->ops->set_direction(tea, 1);
+       udelay(16);
+
+       for (l = 25; l > 0; l--) {
+               data = (val >> 24) & TEA575X_DATA;
+               val <<= 1;                      /* shift data */
+               tea->ops->set_pins(tea, data | TEA575X_WREN);
+               udelay(2);
+               tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
+               udelay(2);
+               tea->ops->set_pins(tea, data | TEA575X_WREN);
+               udelay(2);
+       }
+
+       if (!tea->mute)
+               tea->ops->set_pins(tea, 0);
+}
+
+static unsigned int snd_tea575x_read(struct snd_tea575x *tea)
+{
+       u16 l, rdata;
+       u32 data = 0;
+
+       tea->ops->set_direction(tea, 0);
+       tea->ops->set_pins(tea, 0);
+       udelay(16);
+
+       for (l = 24; l--;) {
+               tea->ops->set_pins(tea, TEA575X_CLK);
+               udelay(2);
+               if (!l)
+                       tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
+               tea->ops->set_pins(tea, 0);
+               udelay(2);
+               data <<= 1;                     /* shift data */
+               rdata = tea->ops->get_pins(tea);
+               if (!l)
+                       tea->stereo = (rdata & TEA575X_MOST) ?  0 : 1;
+               if (rdata & TEA575X_DATA)
+                       data++;
+               udelay(2);
+       }
+
+       if (tea->mute)
+               tea->ops->set_pins(tea, TEA575X_WREN);
+
+       return data;
+}
+
 static void snd_tea575x_get_freq(struct snd_tea575x *tea)
 {
        unsigned long freq;
 
-       freq = tea->ops->read(tea) & TEA575X_BIT_FREQ_MASK;
+       freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK;
        /* freq *= 12.5 */
        freq *= 125;
        freq /= 10;
@@ -111,7 +165,7 @@ static void snd_tea575x_set_freq(struct snd_tea575x *tea)
 
        tea->val &= ~TEA575X_BIT_FREQ_MASK;
        tea->val |= freq & TEA575X_BIT_FREQ_MASK;
-       tea->ops->write(tea, tea->val);
+       snd_tea575x_write(tea, tea->val);
 }
 
 /*
@@ -139,7 +193,7 @@ static int vidioc_g_tuner(struct file *file, void *priv,
        if (v->index > 0)
                return -EINVAL;
 
-       tea->ops->read(tea);
+       snd_tea575x_read(tea);
 
        strcpy(v->name, "FM");
        v->type = V4L2_TUNER_RADIO;
@@ -233,10 +287,8 @@ static int vidioc_g_ctrl(struct file *file, void *priv,
 
        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
-               if (tea->ops->mute) {
-                       ctrl->value = tea->mute;
-                       return 0;
-               }
+               ctrl->value = tea->mute;
+               return 0;
        }
        return -EINVAL;
 }
@@ -248,11 +300,11 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
 
        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
-               if (tea->ops->mute) {
-                       tea->ops->mute(tea, ctrl->value);
+               if (tea->mute != ctrl->value) {
                        tea->mute = ctrl->value;
-                       return 0;
+                       snd_tea575x_set_freq(tea);
                }
+               return 0;
        }
        return -EINVAL;
 }
@@ -317,18 +369,16 @@ static struct video_device tea575x_radio = {
 /*
  * initialize all the tea575x chips
  */
-void snd_tea575x_init(struct snd_tea575x *tea)
+int snd_tea575x_init(struct snd_tea575x *tea)
 {
        int retval;
-       unsigned int val;
        struct video_device *tea575x_radio_inst;
 
-       val = tea->ops->read(tea);
-       if (val == 0x1ffffff || val == 0) {
-               snd_printk(KERN_ERR
-                          "tea575x-tuner: Cannot find TEA575x chip\n");
-               return;
-       }
+       tea->mute = 1;
+
+       snd_tea575x_write(tea, 0x55AA);
+       if (snd_tea575x_read(tea) != 0x55AA)
+               return -ENODEV;
 
        tea->in_use = 0;
        tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
@@ -337,7 +387,7 @@ void snd_tea575x_init(struct snd_tea575x *tea)
        tea575x_radio_inst = video_device_alloc();
        if (tea575x_radio_inst == NULL) {
                printk(KERN_ERR "tea575x-tuner: not enough memory\n");
-               return;
+               return -ENOMEM;
        }
 
        memcpy(tea575x_radio_inst, &tea575x_radio, sizeof(tea575x_radio));
@@ -352,17 +402,13 @@ void snd_tea575x_init(struct snd_tea575x *tea)
        if (retval) {
                printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
                kfree(tea575x_radio_inst);
-               return;
+               return retval;
        }
 
        snd_tea575x_set_freq(tea);
-
-       /* mute on init */
-       if (tea->ops->mute) {
-               tea->ops->mute(tea, 1);
-               tea->mute = 1;
-       }
        tea->vd = tea575x_radio_inst;
+
+       return 0;
 }
 
 void snd_tea575x_exit(struct snd_tea575x *tea)