[media] tea575x-tuner: update to latest V4L2 framework requirements

The tea575x-tuner module has been updated to use the latest V4L2 framework
functionality. This also required changes in the drivers that rely on it.

The tea575x changes are:

- The drivers must provide a v4l2_device struct to the tea module.
- The radio_nr module parameter must be part of the actual radio driver,
  and not of the tea module.
- Changed the frequency range to the normal 76-108 MHz range instead of
  50-150.
- Add hardware frequency seek support.
- Fix broken rxsubchans/audmode handling.
- The application can now select between stereo and mono.
- Support polling for control events.
- Add V4L2 priority handling.

And radio-sf16fmr2.c now uses the isa bus kernel framework.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Thanks-to: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 80 insertions, 66 deletions

diff --git a/sound/i2c/other/tea575x-tuner.c b/sound/i2c/other/tea575x-tuner.c
index 6b68c8206805..b291bd86c4ca 100644
--- a/sound/i2c/other/tea575x-tuner.c
+++ b/sound/i2c/other/tea575x-tuner.c
@@ -25,21 +25,20 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
-#include <linux/version.h>
+#include <linux/sched.h>
+#include <media/v4l2-device.h>
 #include <media/v4l2-dev.h>
+#include <media/v4l2-fh.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
 #include <sound/tea575x-tuner.h>
 
 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
 MODULE_LICENSE("GPL");
 
-static int radio_nr = -1;
-module_param(radio_nr, int, 0);
-
-#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
-#define FREQ_LO          (50UL * 16000)
-#define FREQ_HI         (150UL * 16000)
+#define FREQ_LO          (76U * 16000)
+#define FREQ_HI         (108U * 16000)
 
 /*
  * definitions
@@ -121,28 +120,10 @@ static unsigned int snd_tea575x_read(struct snd_tea575x *tea)
         return data;
 }
 
-static void snd_tea575x_get_freq(struct snd_tea575x *tea)
-{
-        unsigned long freq;
-
-        freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK;
-        /* freq *= 12.5 */
-        freq *= 125;
-        freq /= 10;
-        /* crystal fixup */
-        if (tea->tea5759)
-                freq += TEA575X_FMIF;
-        else
-                freq -= TEA575X_FMIF;
-
-        tea->freq = freq * 16;          /* from kHz */
-}
-
 static void snd_tea575x_set_freq(struct snd_tea575x *tea)
 {
-        unsigned long freq;
+        u32 freq = tea->freq;
 
-        freq = clamp(tea->freq, FREQ_LO, FREQ_HI);
         freq /= 16;             /* to kHz */
         /* crystal fixup */
         if (tea->tea5759)
@@ -167,12 +148,14 @@ static int vidioc_querycap(struct file *file, void  *priv,
 {
         struct snd_tea575x *tea = video_drvdata(file);
 
-        strlcpy(v->driver, "tea575x-tuner", sizeof(v->driver));
+        strlcpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
         strlcpy(v->card, tea->card, sizeof(v->card));
         strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
         strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
-        v->version = RADIO_VERSION;
-        v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+        v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+        if (!tea->cannot_read_data)
+                v->device_caps |= V4L2_CAP_HW_FREQ_SEEK;
+        v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
         return 0;
 }
 
@@ -191,18 +174,24 @@ static int vidioc_g_tuner(struct file *file, void *priv,
         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
         v->rangelow = FREQ_LO;
         v->rangehigh = FREQ_HI;
-        v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
-        v->audmode = tea->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
+        v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
+        v->audmode = (tea->val & TEA575X_BIT_MONO) ?
+                V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
         v->signal = tea->tuned ? 0xffff : 0;
-
         return 0;
 }
 
 static int vidioc_s_tuner(struct file *file, void *priv,
                                         struct v4l2_tuner *v)
 {
-        if (v->index > 0)
+        struct snd_tea575x *tea = video_drvdata(file);
+
+        if (v->index)
                 return -EINVAL;
+        tea->val &= ~TEA575X_BIT_MONO;
+        if (v->audmode == V4L2_TUNER_MODE_MONO)
+                tea->val |= TEA575X_BIT_MONO;
+        snd_tea575x_write(tea, tea->val);
         return 0;
 }
 
@@ -214,7 +203,6 @@ static int vidioc_g_frequency(struct file *file, void *priv,
         if (f->tuner != 0)
                 return -EINVAL;
         f->type = V4L2_TUNER_RADIO;
-        snd_tea575x_get_freq(tea);
         f->frequency = tea->freq;
         return 0;
 }
@@ -227,32 +215,47 @@ static int vidioc_s_frequency(struct file *file, void *priv,
         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
                 return -EINVAL;
 
-        if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
-                return -EINVAL;
-
-        tea->freq = f->frequency;
-
+        tea->val &= ~TEA575X_BIT_SEARCH;
+        tea->freq = clamp(f->frequency, FREQ_LO, FREQ_HI);
         snd_tea575x_set_freq(tea);
-
         return 0;
 }
 
-static int vidioc_g_audio(struct file *file, void *priv,
-                                        struct v4l2_audio *a)
+static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
+                                        struct v4l2_hw_freq_seek *a)
 {
-        if (a->index > 1)
-                return -EINVAL;
-
-        strcpy(a->name, "Radio");
-        a->capability = V4L2_AUDCAP_STEREO;
-        return 0;
-}
+        struct snd_tea575x *tea = video_drvdata(file);
 
-static int vidioc_s_audio(struct file *file, void *priv,
-                                        struct v4l2_audio *a)
-{
-        if (a->index != 0)
+        if (tea->cannot_read_data)
+                return -ENOTTY;
+        if (a->tuner || a->wrap_around)
                 return -EINVAL;
+        tea->val |= TEA575X_BIT_SEARCH;
+        tea->val &= ~TEA575X_BIT_UPDOWN;
+        if (a->seek_upward)
+                tea->val |= TEA575X_BIT_UPDOWN;
+        snd_tea575x_write(tea, tea->val);
+        for (;;) {
+                unsigned val = snd_tea575x_read(tea);
+
+                if (!(val & TEA575X_BIT_SEARCH)) {
+                        /* Found a frequency */
+                        val &= TEA575X_BIT_FREQ_MASK;
+                        val = (val * 10) / 125;
+                        if (tea->tea5759)
+                                val += TEA575X_FMIF;
+                        else
+                                val -= TEA575X_FMIF;
+                        tea->freq = clamp(val * 16, FREQ_LO, FREQ_HI);
+                        return 0;
+                }
+                if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
+                        /* some signal arrived, stop search */
+                        tea->val &= ~TEA575X_BIT_SEARCH;
+                        snd_tea575x_write(tea, tea->val);
+                        return -ERESTARTSYS;
+                }
+        }
         return 0;
 }
 
@@ -273,23 +276,27 @@ static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
 static const struct v4l2_file_operations tea575x_fops = {
         .owner          = THIS_MODULE,
         .unlocked_ioctl = video_ioctl2,
+        .open           = v4l2_fh_open,
+        .release        = v4l2_fh_release,
+        .poll           = v4l2_ctrl_poll,
 };
 
 static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
         .vidioc_querycap    = vidioc_querycap,
         .vidioc_g_tuner     = vidioc_g_tuner,
         .vidioc_s_tuner     = vidioc_s_tuner,
-        .vidioc_g_audio     = vidioc_g_audio,
-        .vidioc_s_audio     = vidioc_s_audio,
         .vidioc_g_frequency = vidioc_g_frequency,
         .vidioc_s_frequency = vidioc_s_frequency,
+        .vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
+        .vidioc_log_status  = v4l2_ctrl_log_status,
+        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 };
 
-static struct video_device tea575x_radio = {
-        .name           = "tea575x-tuner",
+static const struct video_device tea575x_radio = {
         .fops           = &tea575x_fops,
         .ioctl_ops      = &tea575x_ioctl_ops,
-        .release        = video_device_release_empty,
+        .release        = video_device_release_empty,
 };
 
 static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
@@ -303,11 +310,15 @@ int snd_tea575x_init(struct snd_tea575x *tea)
 {
         int retval;
 
-        tea->mute = 1;
+        tea->mute = true;
 
-        snd_tea575x_write(tea, 0x55AA);
-        if (snd_tea575x_read(tea) != 0x55AA)
-                return -ENODEV;
+        /* Not all devices can or know how to read the data back.
+           Such devices can set cannot_read_data to true. */
+        if (!tea->cannot_read_data) {
+                snd_tea575x_write(tea, 0x55AA);
+                if (snd_tea575x_read(tea) != 0x55AA)
+                        return -ENODEV;
+        }
 
         tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
         tea->freq = 90500 * 16;         /* 90.5Mhz default */
@@ -316,14 +327,17 @@ int snd_tea575x_init(struct snd_tea575x *tea)
         tea->vd = tea575x_radio;
         video_set_drvdata(&tea->vd, tea);
         mutex_init(&tea->mutex);
+        strlcpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
         tea->vd.lock = &tea->mutex;
+        tea->vd.v4l2_dev = tea->v4l2_dev;
+        tea->vd.ctrl_handler = &tea->ctrl_handler;
+        set_bit(V4L2_FL_USE_FH_PRIO, &tea->vd.flags);
 
         v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
-        tea->vd.ctrl_handler = &tea->ctrl_handler;
         v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops, V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
         retval = tea->ctrl_handler.error;
         if (retval) {
-                printk(KERN_ERR "tea575x-tuner: can't initialize controls\n");
+                v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
                 return retval;
         }
@@ -338,9 +352,9 @@ int snd_tea575x_init(struct snd_tea575x *tea)
 
         v4l2_ctrl_handler_setup(&tea->ctrl_handler);
 
-        retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, radio_nr);
+        retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
         if (retval) {
-                printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
+                v4l2_err(tea->v4l2_dev, "can't register video device!\n");
                 v4l2_ctrl_handler_free(&tea->ctrl_handler);
                 return retval;
         }