[media] radio-tea5764: some cleanups and clamp frequency when out-of-range

Some small cleanups and when setting the frequency it is now clamped
to the valid frequency range instead of returning an error.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Fabio Belavenuto <belavenuto@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 13 insertions, 11 deletions

diff --git a/drivers/media/radio/radio-tea5764.c b/drivers/media/radio/radio-tea5764.c
index c22feedb36f5..036e2f54f4db 100644
--- a/drivers/media/radio/radio-tea5764.c
+++ b/drivers/media/radio/radio-tea5764.c
@@ -60,8 +60,8 @@
 
 /* Frequency limits in MHz -- these are European values.  For Japanese
 devices, that would be 76000 and 91000.  */
-#define FREQ_MIN  87500
-#define FREQ_MAX 108000
+#define FREQ_MIN  87500U
+#define FREQ_MAX 108000U
 #define FREQ_MUL 16
 
 /* TEA5764 registers */
@@ -309,8 +309,7 @@ static int vidioc_g_tuner(struct file *file, void *priv,
         if (v->index > 0)
                 return -EINVAL;
 
-        memset(v, 0, sizeof(*v));
-        strcpy(v->name, "FM");
+        strlcpy(v->name, "FM", sizeof(v->name));
         v->type = V4L2_TUNER_RADIO;
         tea5764_i2c_read(radio);
         v->rangelow   = FREQ_MIN * FREQ_MUL;
@@ -343,19 +342,23 @@ static int vidioc_s_frequency(struct file *file, void *priv,
                                 const struct v4l2_frequency *f)
 {
         struct tea5764_device *radio = video_drvdata(file);
+        unsigned freq = f->frequency;
 
         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
                 return -EINVAL;
-        if (f->frequency == 0) {
+        if (freq == 0) {
                 /* We special case this as a power down control. */
                 tea5764_power_down(radio);
-        }
-        if (f->frequency < (FREQ_MIN * FREQ_MUL))
-                return -EINVAL;
-        if (f->frequency > (FREQ_MAX * FREQ_MUL))
+                /* Yes, that's what is returned in this case. This
+                   whole special case is non-compliant and should really
+                   be replaced with something better, but changing this
+                   might well break code that depends on this behavior.
+                   So we keep it as-is. */
                 return -EINVAL;
+        }
+        clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
         tea5764_power_up(radio);
-        tea5764_tune(radio, (f->frequency * 125) / 2);
+        tea5764_tune(radio, (freq * 125) / 2);
         return 0;
 }
 
@@ -368,7 +371,6 @@ static int vidioc_g_frequency(struct file *file, void *priv,
         if (f->tuner != 0)
                 return -EINVAL;
         tea5764_i2c_read(radio);
-        memset(f, 0, sizeof(*f));
         f->type = V4L2_TUNER_RADIO;
         if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
                 f->frequency = (tea5764_get_freq(radio) * 2) / 125;