4d7aa5e991
v4l2_subdev_{core/video}_ops structures are stored in the
fields of the v4l2_subdev_ops structure which are of type const.
Also, v4l2_subdev_ops structure is passed to a function
having its argument of type const. As these structures are never
modified, so declare them as const.
Done using Coccinelle: (One of the scripts used)
@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct v4l2_subdev_video_ops i@p = {...};
@ok1@
identifier r1.i;
position p;
struct v4l2_subdev_ops obj;
@@
obj.video=&i@p;
@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p
@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct v4l2_subdev_video_ops i;
File size before:
text data bss dec hex filename
1809 872 0 2681 a79 drivers/media/i2c/ak881x.o
File size after:
text data bss dec hex filename
2185 496 0 2681 a79 drivers/media/i2c/ak881x.o
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
334 lines
7.7 KiB
C
334 lines
7.7 KiB
C
/*
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* Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
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*
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* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/videodev2.h>
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#include <linux/module.h>
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#include <media/i2c/ak881x.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#define AK881X_INTERFACE_MODE 0
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#define AK881X_VIDEO_PROCESS1 1
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#define AK881X_VIDEO_PROCESS2 2
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#define AK881X_VIDEO_PROCESS3 3
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#define AK881X_DAC_MODE 5
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#define AK881X_STATUS 0x24
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#define AK881X_DEVICE_ID 0x25
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#define AK881X_DEVICE_REVISION 0x26
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struct ak881x {
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struct v4l2_subdev subdev;
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struct ak881x_pdata *pdata;
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unsigned int lines;
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char revision; /* DEVICE_REVISION content */
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};
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static int reg_read(struct i2c_client *client, const u8 reg)
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{
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int reg_write(struct i2c_client *client, const u8 reg,
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const u8 data)
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{
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return i2c_smbus_write_byte_data(client, reg, data);
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}
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static int reg_set(struct i2c_client *client, const u8 reg,
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const u8 data, u8 mask)
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{
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int ret = reg_read(client, reg);
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if (ret < 0)
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return ret;
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return reg_write(client, reg, (ret & ~mask) | (data & mask));
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}
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static struct ak881x *to_ak881x(const struct i2c_client *client)
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{
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return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int ak881x_g_register(struct v4l2_subdev *sd,
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struct v4l2_dbg_register *reg)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (reg->reg > 0x26)
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return -EINVAL;
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reg->size = 1;
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reg->val = reg_read(client, reg->reg);
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if (reg->val > 0xffff)
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return -EIO;
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return 0;
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}
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static int ak881x_s_register(struct v4l2_subdev *sd,
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const struct v4l2_dbg_register *reg)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (reg->reg > 0x26)
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return -EINVAL;
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if (reg_write(client, reg->reg, reg->val) < 0)
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return -EIO;
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return 0;
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}
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#endif
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static int ak881x_fill_fmt(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *format)
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{
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struct v4l2_mbus_framefmt *mf = &format->format;
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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if (format->pad)
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return -EINVAL;
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v4l_bound_align_image(&mf->width, 0, 720, 2,
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&mf->height, 0, ak881x->lines, 1, 0);
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mf->field = V4L2_FIELD_INTERLACED;
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mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
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mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
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return 0;
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}
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static int ak881x_enum_mbus_code(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_mbus_code_enum *code)
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{
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if (code->pad || code->index)
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return -EINVAL;
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code->code = MEDIA_BUS_FMT_YUYV8_2X8;
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return 0;
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}
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static int ak881x_get_selection(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_selection *sel)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
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return -EINVAL;
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switch (sel->target) {
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case V4L2_SEL_TGT_CROP_BOUNDS:
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case V4L2_SEL_TGT_CROP_DEFAULT:
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sel->r.left = 0;
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sel->r.top = 0;
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sel->r.width = 720;
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sel->r.height = ak881x->lines;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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u8 vp1;
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if (std == V4L2_STD_NTSC_443) {
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vp1 = 3;
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ak881x->lines = 480;
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} else if (std == V4L2_STD_PAL_M) {
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vp1 = 5;
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ak881x->lines = 480;
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} else if (std == V4L2_STD_PAL_60) {
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vp1 = 7;
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ak881x->lines = 480;
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} else if (std & V4L2_STD_NTSC) {
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vp1 = 0;
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ak881x->lines = 480;
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} else if (std & V4L2_STD_PAL) {
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vp1 = 0xf;
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ak881x->lines = 576;
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} else {
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/* No SECAM or PAL_N/Nc supported */
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return -EINVAL;
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}
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reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
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return 0;
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}
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static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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if (enable) {
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u8 dac;
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/* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
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/* Default: composite output */
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if (ak881x->pdata->flags & AK881X_COMPONENT)
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dac = 3;
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else
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dac = 4;
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/* Turn on the DAC(s) */
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reg_write(client, AK881X_DAC_MODE, dac);
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dev_dbg(&client->dev, "chip status 0x%x\n",
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reg_read(client, AK881X_STATUS));
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} else {
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/* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
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reg_write(client, AK881X_DAC_MODE, 0);
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dev_dbg(&client->dev, "chip status 0x%x\n",
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reg_read(client, AK881X_STATUS));
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}
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return 0;
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}
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static const struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = ak881x_g_register,
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.s_register = ak881x_s_register,
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#endif
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};
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static const struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
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.s_std_output = ak881x_s_std_output,
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.s_stream = ak881x_s_stream,
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};
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static const struct v4l2_subdev_pad_ops ak881x_subdev_pad_ops = {
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.enum_mbus_code = ak881x_enum_mbus_code,
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.get_selection = ak881x_get_selection,
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.set_fmt = ak881x_fill_fmt,
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.get_fmt = ak881x_fill_fmt,
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};
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static const struct v4l2_subdev_ops ak881x_subdev_ops = {
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.core = &ak881x_subdev_core_ops,
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.video = &ak881x_subdev_video_ops,
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.pad = &ak881x_subdev_pad_ops,
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};
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static int ak881x_probe(struct i2c_client *client,
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const struct i2c_device_id *did)
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{
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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struct ak881x *ak881x;
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u8 ifmode, data;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_warn(&adapter->dev,
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"I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
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return -EIO;
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}
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ak881x = devm_kzalloc(&client->dev, sizeof(*ak881x), GFP_KERNEL);
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if (!ak881x)
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return -ENOMEM;
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v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
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data = reg_read(client, AK881X_DEVICE_ID);
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switch (data) {
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case 0x13:
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case 0x14:
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break;
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default:
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dev_err(&client->dev,
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"No ak881x chip detected, register read %x\n", data);
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return -ENODEV;
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}
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ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
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ak881x->pdata = client->dev.platform_data;
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if (ak881x->pdata) {
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if (ak881x->pdata->flags & AK881X_FIELD)
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ifmode = 4;
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else
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ifmode = 0;
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switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
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case AK881X_IF_MODE_BT656:
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ifmode |= 1;
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break;
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case AK881X_IF_MODE_MASTER:
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ifmode |= 2;
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break;
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case AK881X_IF_MODE_SLAVE:
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default:
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break;
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}
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dev_dbg(&client->dev, "IF mode %x\n", ifmode);
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/*
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* "Line Blanking No." seems to be the same as the number of
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* "black" lines on, e.g., SuperH VOU, whose default value of 20
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* "incidentally" matches ak881x' default
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*/
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reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
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}
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/* Hardware default: NTSC-M */
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ak881x->lines = 480;
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dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
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data, ak881x->revision);
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return 0;
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}
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static int ak881x_remove(struct i2c_client *client)
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{
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struct ak881x *ak881x = to_ak881x(client);
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v4l2_device_unregister_subdev(&ak881x->subdev);
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return 0;
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}
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static const struct i2c_device_id ak881x_id[] = {
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{ "ak8813", 0 },
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{ "ak8814", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ak881x_id);
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static struct i2c_driver ak881x_i2c_driver = {
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.driver = {
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.name = "ak881x",
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},
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.probe = ak881x_probe,
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.remove = ak881x_remove,
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.id_table = ak881x_id,
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};
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module_i2c_driver(ak881x_i2c_driver);
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MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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MODULE_LICENSE("GPL v2");
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