Re: [PATCH v4] tea575x: convert to control framework

From: Hans Verkuil
Date: Thu May 19 2011 - 02:46:03 EST

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In reply to: Ondrej Zary: "[PATCH v4] tea575x: convert to control framework"
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On Wednesday, May 18, 2011 23:35:22 Ondrej Zary wrote:
> Convert tea575x-tuner to use the new V4L2 control framework. Also add
> ext_init() callback that can be used by a card driver for additional
> initialization right before registering the video device (for SF16-FMR2).
>
> Also embed struct video_device to struct snd_tea575x to simplify the code.
>
> 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 2011-05-18 23:14:48.000000000 +0200
> @@ -23,8 +23,8 @@
> */
>
> #include <linux/videodev2.h>
> +#include <media/v4l2-ctrls.h>
> #include <media/v4l2-dev.h>
> -#include <media/v4l2-ioctl.h>
>
> #define TEA575X_FMIF 10700
>
> @@ -42,7 +42,8 @@ struct snd_tea575x_ops {
> };
>
> struct snd_tea575x {
> - struct video_device *vd; /* video device */
> + struct video_device vd; /* video device */
> + bool initialized;

This isn't needed, more about that below.

> bool tea5759; /* 5759 chip is present */
> bool mute; /* Device is muted? */
> bool stereo; /* receiving stereo */
> @@ -54,6 +55,8 @@ 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);

ext_init should return int to pass back errors.

> };
>
> 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 2011-05-18 23:22:44.000000000 +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 +255,17 @@ 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)
> +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:
> - ctrl->value = tea->mute;
> + tea->mute = ctrl->val;
> + snd_tea575x_set_freq(tea);
> return 0;
> }
> - return -EINVAL;
> -}
> -
> -static int vidioc_s_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:
> - if (tea->mute != ctrl->value) {
> - tea->mute = ctrl->value;
> - snd_tea575x_set_freq(tea);
> - }
> - return 0;
> - }
> return -EINVAL;
> }
>
> @@ -355,16 +314,17 @@ 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 = {
> .name = "tea575x-tuner",
> .fops = &tea575x_fops,
> .ioctl_ops = &tea575x_ioctl_ops,
> - .release = video_device_release,
> + .release = video_device_release_empty,
> +};
> +
> +static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
> + .s_ctrl = tea575x_s_ctrl,
> };
>
> /*
> @@ -373,7 +333,6 @@ static struct video_device tea575x_radio
> int snd_tea575x_init(struct snd_tea575x *tea)
> {
> int retval;
> - struct video_device *tea575x_radio_inst;
>
> tea->mute = 1;
>
> @@ -384,39 +343,44 @@ 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) {
> - printk(KERN_ERR "tea575x-tuner: not enough memory\n");
> - return -ENOMEM;
> - }
> + memcpy(&tea->vd, &tea575x_radio, sizeof(tea575x_radio));

You can use tea->vd = tea575x_radio instead of memcpy.

> + video_set_drvdata(&tea->vd, tea);
>
> - memcpy(tea575x_radio_inst, &tea575x_radio, sizeof(tea575x_radio));
> + 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_ctrl_handler_free(&tea->ctrl_handler);
> + return retval;
> + }
> + v4l2_ctrl_handler_setup(&tea->ctrl_handler);

It's better to move this after the ext_init call, then the driver implementing
ext_init doesn't have to call v4l2_ctrl_handler_setup again.

>
> - strcpy(tea575x_radio.name, tea->tea5759 ?
> - "TEA5759 radio" : "TEA5757 radio");
> + if (tea->ext_init)
> + tea->ext_init(tea);

ext_init can return an error. In particular, radio-sf16fmr2 should return
tea->ctrl_handler.error after adding the two new controls since adding
those controls might have failed.

>
> - video_set_drvdata(tea575x_radio_inst, tea);
> + tea->initialized = 1;
>
> - retval = video_register_device(tea575x_radio_inst,
> - VFL_TYPE_RADIO, radio_nr);
> + retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, radio_nr);
> if (retval) {
> printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
> - kfree(tea575x_radio_inst);
> + v4l2_ctrl_handler_free(&tea->ctrl_handler);
> + tea->initialized = 0;
> return retval;
> }
>
> - snd_tea575x_set_freq(tea);
> - tea->vd = tea575x_radio_inst;
> -
> return 0;
> }
>
> void snd_tea575x_exit(struct snd_tea575x *tea)
> {
> - if (tea->vd) {
> - video_unregister_device(tea->vd);
> - tea->vd = NULL;
> + if (tea->initialized) {
> + video_unregister_device(&tea->vd);

video_unregister_device is smart enough to detect a failed video_register_device
call, so there is no need to use this 'initialized' field.

> + v4l2_ctrl_handler_free(&tea->ctrl_handler);
> + tea->initialized = 0;
> }
> }
>
>
>
>

Regards,

Hans
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Next message: Benoit Sigoure: "[PATCH] tcp: Lower the initial RTO to 1s as per draft RFC 2988bis-02."
Previous message: Huang Ying: "Re: [RFC] x86, NMI, Treat unknown NMI as hardware error"
In reply to: Ondrej Zary: "[PATCH v4] tea575x: convert to control framework"
Next in thread: Ondrej Zary: "[PATCH v5] tea575x: convert to control framework"
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