[media] tw9906: add Techwell tw9906 video decoder

Taken from the 0.9.8-5 version of the out-of-tree wis-go7007 driver.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 252 insertions, 0 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 07d9c11e91aa..9e7ce8bff4e9 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -320,6 +320,16 @@ config VIDEO_TW9903
           To compile this driver as a module, choose M here: the
           module will be called tw9903.
 
+config VIDEO_TW9906
+        tristate "Techwell TW9906 video decoder"
+        depends on VIDEO_V4L2 && I2C
+        ---help---
+          Support for the Techwell tw9906 enhanced multi-standard comb filter
+          video decoder with YCbCr input support.
+
+          To compile this driver as a module, choose M here: the
+          module will be called tw9906.
+
 config VIDEO_VPX3220
         tristate "vpx3220a, vpx3216b & vpx3214c video decoders"
         depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 399050a99b19..720f42d9d9f4 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o
 obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
 obj-$(CONFIG_VIDEO_TW2804) += tw2804.o
 obj-$(CONFIG_VIDEO_TW9903) += tw9903.o
+obj-$(CONFIG_VIDEO_TW9906) += tw9906.o
 obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o
 obj-$(CONFIG_VIDEO_M52790) += m52790.o
diff --git a/drivers/media/i2c/tw9906.c b/drivers/media/i2c/tw9906.c
new file mode 100644
index 000000000000..2263a914cd08
--- /dev/null
+++ b/drivers/media/i2c/tw9906.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+
+MODULE_DESCRIPTION("TW9906 I2C subdev driver");
+MODULE_LICENSE("GPL v2");
+
+struct tw9906 {
+        struct v4l2_subdev sd;
+        struct v4l2_ctrl_handler hdl;
+        v4l2_std_id norm;
+};
+
+static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
+{
+        return container_of(sd, struct tw9906, sd);
+}
+
+static const u8 initial_registers[] = {
+        0x02, 0x40, /* input 0, composite */
+        0x03, 0xa2, /* correct digital format */
+        0x05, 0x81, /* or 0x01 for PAL */
+        0x07, 0x02, /* window */
+        0x08, 0x14, /* window */
+        0x09, 0xf0, /* window */
+        0x0a, 0x10, /* window */
+        0x0b, 0xd0, /* window */
+        0x0d, 0x00, /* scaling */
+        0x0e, 0x11, /* scaling */
+        0x0f, 0x00, /* scaling */
+        0x10, 0x00, /* brightness */
+        0x11, 0x60, /* contrast */
+        0x12, 0x11, /* sharpness */
+        0x13, 0x7e, /* U gain */
+        0x14, 0x7e, /* V gain */
+        0x15, 0x00, /* hue */
+        0x19, 0x57, /* vbi */
+        0x1a, 0x0f,
+        0x1b, 0x40,
+        0x29, 0x03,
+        0x55, 0x00,
+        0x6b, 0x26,
+        0x6c, 0x36,
+        0x6d, 0xf0,
+        0x6e, 0x41,
+        0x6f, 0x13,
+        0xad, 0x70,
+        0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
+};
+
+static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
+{
+        int i;
+
+        for (i = 0; regs[i] != 0x00; i += 2)
+                if (write_reg(sd, regs[i], regs[i + 1]) < 0)
+                        return -1;
+        return 0;
+}
+
+static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
+                                      u32 output, u32 config)
+{
+        write_reg(sd, 0x02, 0x40 | (input << 1));
+        return 0;
+}
+
+static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+        struct tw9906 *dec = to_state(sd);
+        bool is_60hz = norm & V4L2_STD_525_60;
+        u8 regs[] = {
+                0x05, is_60hz ? 0x81 : 0x01,
+                0x07, is_60hz ? 0x02 : 0x12,
+                0x08, is_60hz ? 0x14 : 0x18,
+                0x09, is_60hz ? 0xf0 : 0x20,
+                0,    0,
+        };
+
+        write_regs(sd, regs);
+        dec->norm = norm;
+        return 0;
+}
+
+static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+        struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
+        struct v4l2_subdev *sd = &dec->sd;
+
+        switch (ctrl->id) {
+        case V4L2_CID_BRIGHTNESS:
+                write_reg(sd, 0x10, ctrl->val);
+                break;
+        case V4L2_CID_CONTRAST:
+                write_reg(sd, 0x11, ctrl->val);
+                break;
+        case V4L2_CID_HUE:
+                write_reg(sd, 0x15, ctrl->val);
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static int tw9906_log_status(struct v4l2_subdev *sd)
+{
+        struct tw9906 *dec = to_state(sd);
+        bool is_60hz = dec->norm & V4L2_STD_525_60;
+
+        v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
+        v4l2_ctrl_subdev_log_status(sd);
+        return 0;
+}
+
+/* --------------------------------------------------------------------------*/
+
+static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
+        .s_ctrl = tw9906_s_ctrl,
+};
+
+static const struct v4l2_subdev_core_ops tw9906_core_ops = {
+        .log_status = tw9906_log_status,
+        .s_std = tw9906_s_std,
+};
+
+static const struct v4l2_subdev_video_ops tw9906_video_ops = {
+        .s_routing = tw9906_s_video_routing,
+};
+
+static const struct v4l2_subdev_ops tw9906_ops = {
+        .core = &tw9906_core_ops,
+        .video = &tw9906_video_ops,
+};
+
+static int tw9906_probe(struct i2c_client *client,
+                             const struct i2c_device_id *id)
+{
+        struct tw9906 *dec;
+        struct v4l2_subdev *sd;
+        struct v4l2_ctrl_handler *hdl;
+
+        /* Check if the adapter supports the needed features */
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+
+        v4l_info(client, "chip found @ 0x%02x (%s)\n",
+                        client->addr << 1, client->adapter->name);
+
+        dec = kzalloc(sizeof(struct tw9906), GFP_KERNEL);
+        if (dec == NULL)
+                return -ENOMEM;
+        sd = &dec->sd;
+        v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
+        hdl = &dec->hdl;
+        v4l2_ctrl_handler_init(hdl, 4);
+        v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
+                V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
+        v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
+                V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
+        v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
+                V4L2_CID_HUE, -128, 127, 1, 0);
+        sd->ctrl_handler = hdl;
+        if (hdl->error) {
+                int err = hdl->error;
+
+                v4l2_ctrl_handler_free(hdl);
+                kfree(dec);
+                return err;
+        }
+
+        /* Initialize tw9906 */
+        dec->norm = V4L2_STD_NTSC;
+
+        if (write_regs(sd, initial_registers) < 0) {
+                v4l2_err(client, "error initializing TW9906\n");
+                kfree(dec);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int tw9906_remove(struct i2c_client *client)
+{
+        struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+        v4l2_device_unregister_subdev(sd);
+        v4l2_ctrl_handler_free(&to_state(sd)->hdl);
+        kfree(to_state(sd));
+        return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct i2c_device_id tw9906_id[] = {
+        { "tw9906", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, tw9906_id);
+
+static struct i2c_driver tw9906_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "tw9906",
+        },
+        .probe = tw9906_probe,
+        .remove = tw9906_remove,
+        .id_table = tw9906_id,
+};
+module_i2c_driver(tw9906_driver);