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Date: Fri, 25 Jan 2013 12:30:58 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Prabhakar Lad <prabhakar.csengg@...il.com>
Cc: LMML <linux-media@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Mauro Carvalho Chehab <mchehab@...hat.com>,
Hans Verkuil <hans.verkuil@...co.com>,
Manjunath Hadli <manjunath.hadli@...com>,
"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH 2/2] media: add support for THS7353 video amplifier
Hi Prabhakar,
Some comments below:
On Fri January 25 2013 11:36:07 Prabhakar Lad wrote:
> From: Manjunath Hadli <manjunath.hadli@...com>
>
> The patch adds support for THS7353 video amplifier. Enable
> dv_preset support for THS7353 so that setting a HD mode on the
> host device makes sure appropriate mode in the amplifier is enabled.
>
> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
> ---
> drivers/media/i2c/Kconfig | 10 ++
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ths7353.c | 223 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 234 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/i2c/ths7353.c
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 24d78e2..d1ebb0b 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -570,6 +570,16 @@ config VIDEO_THS7303
> To compile this driver as a module, choose M here: the
> module will be called ths7303.
>
> +config VIDEO_THS7353
> + tristate "THS7353 Video Amplifier"
> + depends on I2C
> + help
> + Support for TI THS7353 video amplifier
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ths7353. This helps tvp7002 to amplify
> + the signals.
> +
> config VIDEO_M52790
> tristate "Mitsubishi M52790 A/V switch"
> depends on VIDEO_V4L2 && I2C
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index b1d62df..9944d06 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_VIDEO_BT856) += bt856.o
> obj-$(CONFIG_VIDEO_BT866) += bt866.o
> obj-$(CONFIG_VIDEO_KS0127) += ks0127.o
> obj-$(CONFIG_VIDEO_THS7303) += ths7303.o
> +obj-$(CONFIG_VIDEO_THS7353) += ths7353.o
> obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o
> obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o
> obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
> diff --git a/drivers/media/i2c/ths7353.c b/drivers/media/i2c/ths7353.c
> new file mode 100644
> index 0000000..288cd1f
> --- /dev/null
> +++ b/drivers/media/i2c/ths7353.c
> @@ -0,0 +1,223 @@
> +/*
> + * Copyright (C) 2013 Texas Instruments Inc
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +
> +#include <media/v4l2-chip-ident.h>
> +#include <media/v4l2-device.h>
> +
> +static int debug;
> +module_param(debug, int, 0644);
> +MODULE_PARM_DESC(debug, "Debug level 0-1");
> +
> +#define THS7353_CHANNEL_1 1
> +#define THS7353_CHANNEL_2 2
> +#define THS7353_CHANNEL_3 3
> +
> +#define THS7353_DEF_LUMA_CHANNEL 2
> +
> +/* all supported modes */
> +enum ths7353_filter_mode {
> + THS_FILTER_MODE_480I_576I,
> + THS_FILTER_MODE_480P_576P,
> + THS_FILTER_MODE_720P_1080I,
> + THS_FILTER_MODE_1080P
> +};
> +
> +static int ths7353_luma_channel;
Never have statics in a driver! This doesn't work if you have more than one
ths7353 in your device.
> +
> +/* following function is used to set ths7353 */
> +static int ths7353_setvalue(struct v4l2_subdev *sd,
> + enum ths7353_filter_mode mode)
> +{
> + u8 val = 0, input_bias_luma = 5, input_bias_chroma = 4, temp;
> + struct i2c_client *client;
> + int err, disable;
> + int channel = 3;
> +
> + client = v4l2_get_subdevdata(sd);
> +
> + switch (mode) {
> + case THS_FILTER_MODE_1080P:
> + /* LPF - 5MHz */
> + val = (3 << 6);
> + /* LPF - bypass */
> + val |= (3 << 3);
> + break;
> + case THS_FILTER_MODE_720P_1080I:
> + /* LPF - 5MHz */
> + val = (2 << 6);
> + /* LPF - 35 MHz */
> + val |= (2 << 3);
> + break;
> + case THS_FILTER_MODE_480P_576P:
> + /* LPF - 2.5MHz */
> + val = (1 << 6);
> + /* LPF - 16 MHz */
> + val |= (1 << 3);
> + break;
> + case THS_FILTER_MODE_480I_576I:
> + /* LPF - 500 KHz, LPF - 9 MHz. Do nothing */
> + break;
> + default:
> + /* disable all channels */
> + disable = 1;
> + }
> +
> + channel = ths7353_luma_channel;
> +
> + /* Setup channel 2 - Luma - Green */
> + temp = val;
> + if (!disable)
> + val |= input_bias_luma;
> + err = i2c_smbus_write_byte_data(client, channel, val);
> + if (err)
> + goto out;
> +
> + /* setup two chroma channels */
> + if (!disable)
> + temp |= input_bias_chroma;
> + channel++;
> + if (channel > THS7353_CHANNEL_3)
> + channel = THS7353_CHANNEL_1;
> + err = i2c_smbus_write_byte_data(client, channel, temp);
> + if (err)
> + goto out;
> +
> + channel++;
> + if (channel > THS7353_CHANNEL_3)
> + channel = THS7353_CHANNEL_1;
> + err = i2c_smbus_write_byte_data(client, channel, temp);
> + if (err)
> + goto out;
> +
> + return 0;
> +
> +out:
> + v4l2_err(sd, "ths7353 write failed\n");
> + return err;
> +}
> +
> +static int ths7353_s_preset(struct v4l2_subdev *sd,
> + struct v4l2_dv_preset *preset)
NACK: the preset API is deprecated, use the s_dv_timings API instead.
> +{
> + switch (preset->preset) {
> + case V4L2_DV_576P50:
> + case V4L2_DV_480P59_94:
> + return ths7353_setvalue(sd, THS_FILTER_MODE_480P_576P);
> +
> + case V4L2_DV_720P50:
> + case V4L2_DV_720P60:
> + case V4L2_DV_1080I60:
> + case V4L2_DV_1080I50:
> + return ths7353_setvalue(sd, THS_FILTER_MODE_720P_1080I);
> +
> + case V4L2_DV_1080P60:
> + return ths7353_setvalue(sd, THS_FILTER_MODE_1080P);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ths7353_g_chip_ident(struct v4l2_subdev *sd,
> + struct v4l2_dbg_chip_ident *chip)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> + return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7353, 0);
> +}
> +
> +static const struct v4l2_subdev_video_ops ths7353_video_ops = {
> + .s_dv_preset = ths7353_s_preset,
> +};
> +
> +static const struct v4l2_subdev_core_ops ths7353_core_ops = {
> + .g_chip_ident = ths7353_g_chip_ident,
> +};
> +
> +static const struct v4l2_subdev_ops ths7353_ops = {
> + .core = &ths7353_core_ops,
> + .video = &ths7353_video_ops,
> +};
> +
> +static int ths7353_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct v4l2_subdev *sd;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> + return -ENODEV;
> +
> + v4l_info(client, "chip found @ 0x%x (%s)\n",
> + client->addr << 1, client->adapter->name);
> +
> + if (!client->dev.platform_data) {
> + v4l_warn(client, "No platform data!!\n");
> + ths7353_luma_channel = THS7353_DEF_LUMA_CHANNEL;
> + } else {
> + ths7353_luma_channel = (int)(client->dev.platform_data);
> + if (ths7353_luma_channel < THS7353_CHANNEL_1 ||
> + ths7353_luma_channel > THS7353_CHANNEL_3) {
> + v4l_warn(client, "Invalid Luma Channel!!\n");
> + ths7353_luma_channel = THS7353_DEF_LUMA_CHANNEL;
> + }
> + }
> +
> + sd = devm_kzalloc(&client->dev, sizeof(struct v4l2_subdev), GFP_KERNEL);
> + if (sd == NULL)
> + return -ENOMEM;
> +
> + v4l2_i2c_subdev_init(sd, client, &ths7353_ops);
> + strlcpy(sd->name, "ths7353", sizeof(sd->name));
> +
> + return ths7353_setvalue(sd, THS_FILTER_MODE_480I_576I);
> +}
> +
> +static int ths7353_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +
> + v4l2_device_unregister_subdev(sd);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id ths7353_id[] = {
> + {"ths7353", 0},
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, ths7353_id);
> +
> +static struct i2c_driver ths7353_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "ths7353",
> + },
> + .probe = ths7353_probe,
> + .remove = ths7353_remove,
> + .id_table = ths7353_id,
> +};
> +
> +module_i2c_driver(ths7353_driver);
> +
> +MODULE_DESCRIPTION("TI THS7353 video amplifier driver");
> +MODULE_AUTHOR("Muralidharan Karicheri");
> +MODULE_LICENSE("GPL");
>
FYI: Cisco has made drivers for the ths7353 and ths8200 as well. While the
ths7353 is pretty complete it needs some tidying up and the ths8200 still
needs more work.
I don't have time to do that, but I will post our ths7353 driver so you
can take the best bits of both.
Ping me when you start working on the ths8200 (or anyone else who is interested
in that driver) and I can mail it.
Regards,
Hans
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