Re: [PATCH RFC v2] tea575x: convert to control framework

From: Hans Verkuil
Date: Wed May 18 2011 - 02:22:18 EST

On Tuesday, May 17, 2011 23:45:07 Ondrej Zary wrote:
> Convert tea575x-tuner to use the new V4L2 control framework.
>
> Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
>
> --- linux-2.6.39-rc2-/include/sound/tea575x-tuner.h 2011-05-13 19:39:23.000000000 +0200
> +++ linux-2.6.39-rc2/include/sound/tea575x-tuner.h 2011-05-17 22:35:19.000000000 +0200
> @@ -23,8 +23,7 @@
> */
>
> #include <linux/videodev2.h>
> -#include <media/v4l2-dev.h>
> -#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-ctrls.h>
>
> #define TEA575X_FMIF 10700
>
> @@ -54,6 +53,8 @@ struct snd_tea575x {
> void *private_data;
> u8 card[32];
> u8 bus_info[32];
> + struct v4l2_ctrl_handler ctrl_handler;
> + void (*ext_init)(struct snd_tea575x *tea);
> };
>
> int snd_tea575x_init(struct snd_tea575x *tea);
> --- linux-2.6.39-rc2-/sound/i2c/other/tea575x-tuner.c 2011-05-13 19:39:23.000000000 +0200
> +++ linux-2.6.39-rc2/sound/i2c/other/tea575x-tuner.c 2011-05-17 23:32:07.000000000 +0200
> @@ -22,11 +22,11 @@
>
> #include <asm/io.h>
> #include <linux/delay.h>
> -#include <linux/interrupt.h>
> #include <linux/init.h>
> #include <linux/slab.h>
> #include <linux/version.h>
> -#include <sound/core.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-ioctl.h>
> #include <sound/tea575x-tuner.h>
>
> MODULE_AUTHOR("Jaroslav Kysela <perex@xxxxxxxx>");
> @@ -62,17 +62,6 @@ module_param(radio_nr, int, 0);
> #define TEA575X_BIT_DUMMY (1<<15) /* buffer */
> #define TEA575X_BIT_FREQ_MASK 0x7fff
>
> -static struct v4l2_queryctrl radio_qctrl[] = {
> - {
> - .id = V4L2_CID_AUDIO_MUTE,
> - .name = "Mute",
> - .minimum = 0,
> - .maximum = 1,
> - .default_value = 1,
> - .type = V4L2_CTRL_TYPE_BOOLEAN,
> - }
> -};
> -
> /*
> * lowlevel part
> */
> @@ -266,47 +255,19 @@ static int vidioc_s_audio(struct file *f
> return 0;
> }
>
> -static int vidioc_queryctrl(struct file *file, void *priv,
> - struct v4l2_queryctrl *qc)
> -{
> - int i;
> -
> - for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
> - if (qc->id && qc->id == radio_qctrl[i].id) {
> - memcpy(qc, &(radio_qctrl[i]),
> - sizeof(*qc));
> - return 0;
> - }
> - }
> - return -EINVAL;
> -}
> -
> -static int vidioc_g_ctrl(struct file *file, void *priv,
> - struct v4l2_control *ctrl)
> -{
> - struct snd_tea575x *tea = video_drvdata(file);
> -
> - switch (ctrl->id) {
> - case V4L2_CID_AUDIO_MUTE:
> - ctrl->value = tea->mute;
> - return 0;
> - }
> - return -EINVAL;
> -}
> -
> -static int vidioc_s_ctrl(struct file *file, void *priv,
> - struct v4l2_control *ctrl)
> +static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
> {
> - struct snd_tea575x *tea = video_drvdata(file);
> + struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
>
> switch (ctrl->id) {
> case V4L2_CID_AUDIO_MUTE:
> - if (tea->mute != ctrl->value) {
> - tea->mute = ctrl->value;
> + if (tea->mute != ctrl->val) {

This test should be removed. s_ctrl is only called when the value actually
changes, and also during handler_setup. With this test the setup call will
actually fail to mute the device.

> + tea->mute = ctrl->val;
> snd_tea575x_set_freq(tea);
> }
> return 0;
> }
> +
> return -EINVAL;
> }
>
> @@ -355,9 +316,6 @@ static const struct v4l2_ioctl_ops tea57
> .vidioc_s_input = vidioc_s_input,
> .vidioc_g_frequency = vidioc_g_frequency,
> .vidioc_s_frequency = vidioc_s_frequency,
> - .vidioc_queryctrl = vidioc_queryctrl,
> - .vidioc_g_ctrl = vidioc_g_ctrl,
> - .vidioc_s_ctrl = vidioc_s_ctrl,
> };
>
> static struct video_device tea575x_radio = {
> @@ -367,6 +325,10 @@ static struct video_device tea575x_radio
> .release = video_device_release,
> };
>
> +static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
> + .s_ctrl = tea575x_s_ctrl,
> +};
> +
> /*
> * initialize all the tea575x chips
> */
> @@ -384,29 +346,39 @@ int snd_tea575x_init(struct snd_tea575x
> tea->in_use = 0;
> tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
> tea->freq = 90500 * 16; /* 90.5Mhz default */
> + snd_tea575x_set_freq(tea);
>
> tea575x_radio_inst = video_device_alloc();
> - if (tea575x_radio_inst == NULL) {
> + if (!tea575x_radio_inst) {
> printk(KERN_ERR "tea575x-tuner: not enough memory\n");
> return -ENOMEM;
> }
>
> memcpy(tea575x_radio_inst, &tea575x_radio, sizeof(tea575x_radio));
> + video_set_drvdata(tea575x_radio_inst, tea);
>
> - strcpy(tea575x_radio.name, tea->tea5759 ?
> - "TEA5759 radio" : "TEA5757 radio");
> + v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
> + tea575x_radio_inst->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) {
> + v4l2_ctrl_handler_free(&tea->ctrl_handler);
> + kfree(tea575x_radio_inst);
> + return retval;
> + }
> + v4l2_ctrl_handler_setup(&tea->ctrl_handler);
>
> - video_set_drvdata(tea575x_radio_inst, tea);
> + if (tea->ext_init)
> + tea->ext_init(tea);
>
> - retval = video_register_device(tea575x_radio_inst,
> - VFL_TYPE_RADIO, radio_nr);
> + retval = video_register_device(tea575x_radio_inst, VFL_TYPE_RADIO, radio_nr);
> if (retval) {
> printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
> + v4l2_ctrl_handler_free(&tea->ctrl_handler);
> kfree(tea575x_radio_inst);
> return retval;
> }

This device registration should be moved down to just before the return 0.

>
> - snd_tea575x_set_freq(tea);
> tea->vd = tea575x_radio_inst;
>
> return 0;
> @@ -415,6 +387,7 @@ int snd_tea575x_init(struct snd_tea575x
> void snd_tea575x_exit(struct snd_tea575x *tea)
> {
> if (tea->vd) {
> + v4l2_ctrl_handler_free(&tea->ctrl_handler);
> video_unregister_device(tea->vd);

Swap these lines: first unregister, then free the handler.

> tea->vd = NULL;
> }
>
>
>

Thanks!

Hans
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