V4L/DVB (11742): TI THS7303 video amplifier driver code

This patch adds driver for TI THS7303 video amplifier. This driver is
implemented as a v4l2 sub device. Tested on TI DM646x EVM.

This version has updates based on review comments by Mauro Chehab.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/drivers/media/video/ths7303.c b/drivers/media/video/ths7303.c
new file mode 100644
index 000000000000..21781f8a0e8e
--- /dev/null
+++ b/drivers/media/video/ths7303.c
@@ -0,0 +1,151 @@
+/*
+ * ths7303- THS7303 Video Amplifier driver
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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 .as is. WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ctype.h>
+#include <linux/i2c.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-chip-ident.h>
+
+MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
+MODULE_AUTHOR("Chaithrika U S");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level 0-1");
+
+/* following function is used to set ths7303 */
+static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
+{
+        int err = 0;
+        u8 val;
+        struct i2c_client *client;
+
+        client = v4l2_get_subdevdata(sd);
+
+        if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
+                val = 0x02;
+                v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
+        } else {
+                val = 0x00;
+                v4l2_dbg(1, debug, sd, "disabling all channels\n");
+        }
+
+        err |= i2c_smbus_write_byte_data(client, 0x01, val);
+        err |= i2c_smbus_write_byte_data(client, 0x02, val);
+        err |= i2c_smbus_write_byte_data(client, 0x03, val);
+
+        if (err)
+                v4l2_err(sd, "write failed\n");
+
+        return err;
+}
+
+static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+        return ths7303_setvalue(sd, norm);
+}
+
+static int ths7303_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_THS7303, 0);
+}
+
+static const struct v4l2_subdev_video_ops ths7303_video_ops = {
+        .s_std_output   = ths7303_s_std_output,
+};
+
+static const struct v4l2_subdev_core_ops ths7303_core_ops = {
+        .g_chip_ident = ths7303_g_chip_ident,
+};
+
+static const struct v4l2_subdev_ops ths7303_ops = {
+        .core   = &ths7303_core_ops,
+        .video  = &ths7303_video_ops,
+};
+
+static int ths7303_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct v4l2_subdev *sd;
+        v4l2_std_id std_id = V4L2_STD_NTSC;
+
+        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);
+
+        sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+        if (sd == NULL)
+                return -ENOMEM;
+
+        v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
+
+        return ths7303_setvalue(sd, std_id);
+}
+
+static int ths7303_remove(struct i2c_client *client)
+{
+        struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+        v4l2_device_unregister_subdev(sd);
+        kfree(sd);
+
+        return 0;
+}
+
+static const struct i2c_device_id ths7303_id[] = {
+        {"ths7303", 0},
+        {},
+};
+
+MODULE_DEVICE_TABLE(i2c, ths7303_id);
+
+static struct i2c_driver ths7303_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "ths7303",
+        },
+        .probe          = ths7303_probe,
+        .remove         = ths7303_remove,
+        .id_table       = ths7303_id,
+};
+
+static int __init ths7303_init(void)
+{
+        return i2c_add_driver(&ths7303_driver);
+}
+
+static void __exit ths7303_exit(void)
+{
+        i2c_del_driver(&ths7303_driver);
+}
+
+module_init(ths7303_init);
+module_exit(ths7303_exit);
+