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path: root/drivers/media/i2c/bt856.c
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Diffstat (limited to 'drivers/media/i2c/bt856.c')
-rw-r--r--drivers/media/i2c/bt856.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/drivers/media/i2c/bt856.c b/drivers/media/i2c/bt856.c
new file mode 100644
index 000000000000..7e5bd365c239
--- /dev/null
+++ b/drivers/media/i2c/bt856.c
@@ -0,0 +1,273 @@
+/*
+ * bt856 - BT856A Digital Video Encoder (Rockwell Part)
+ *
+ * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
+ * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
+ *
+ * Modifications for LML33/DC10plus unified driver
+ * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
+ *
+ * This code was modify/ported from the saa7111 driver written
+ * by Dave Perks.
+ *
+ * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
+ * - moved over to linux>=2.4.x i2c protocol (9/9/2002)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+
+MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
+MODULE_AUTHOR("Mike Bernson & Dave Perks");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+
+/* ----------------------------------------------------------------------- */
+
+#define BT856_REG_OFFSET 0xDA
+#define BT856_NR_REG 6
+
+struct bt856 {
+ struct v4l2_subdev sd;
+ unsigned char reg[BT856_NR_REG];
+
+ v4l2_std_id norm;
+};
+
+static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct bt856, sd);
+}
+
+/* ----------------------------------------------------------------------- */
+
+static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
+
+ encoder->reg[reg - BT856_REG_OFFSET] = value;
+ return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
+{
+ return bt856_write(encoder, reg,
+ (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
+ (value ? (1 << bit) : 0));
+}
+
+static void bt856_dump(struct bt856 *encoder)
+{
+ int i;
+
+ v4l2_info(&encoder->sd, "register dump:\n");
+ for (i = 0; i < BT856_NR_REG; i += 2)
+ printk(KERN_CONT " %02x", encoder->reg[i]);
+ printk(KERN_CONT "\n");
+}
+
+/* ----------------------------------------------------------------------- */
+
+static int bt856_init(struct v4l2_subdev *sd, u32 arg)
+{
+ struct bt856 *encoder = to_bt856(sd);
+
+ /* This is just for testing!!! */
+ v4l2_dbg(1, debug, sd, "init\n");
+ bt856_write(encoder, 0xdc, 0x18);
+ bt856_write(encoder, 0xda, 0);
+ bt856_write(encoder, 0xde, 0);
+
+ bt856_setbit(encoder, 0xdc, 3, 1);
+ /*bt856_setbit(encoder, 0xdc, 6, 0);*/
+ bt856_setbit(encoder, 0xdc, 4, 1);
+
+ if (encoder->norm & V4L2_STD_NTSC)
+ bt856_setbit(encoder, 0xdc, 2, 0);
+ else
+ bt856_setbit(encoder, 0xdc, 2, 1);
+
+ bt856_setbit(encoder, 0xdc, 1, 1);
+ bt856_setbit(encoder, 0xde, 4, 0);
+ bt856_setbit(encoder, 0xde, 3, 1);
+ if (debug != 0)
+ bt856_dump(encoder);
+ return 0;
+}
+
+static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
+{
+ struct bt856 *encoder = to_bt856(sd);
+
+ v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
+
+ if (std & V4L2_STD_NTSC) {
+ bt856_setbit(encoder, 0xdc, 2, 0);
+ } else if (std & V4L2_STD_PAL) {
+ bt856_setbit(encoder, 0xdc, 2, 1);
+ bt856_setbit(encoder, 0xda, 0, 0);
+ /*bt856_setbit(encoder, 0xda, 0, 1);*/
+ } else {
+ return -EINVAL;
+ }
+ encoder->norm = std;
+ if (debug != 0)
+ bt856_dump(encoder);
+ return 0;
+}
+
+static int bt856_s_routing(struct v4l2_subdev *sd,
+ u32 input, u32 output, u32 config)
+{
+ struct bt856 *encoder = to_bt856(sd);
+
+ v4l2_dbg(1, debug, sd, "set input %d\n", input);
+
+ /* We only have video bus.
+ * input= 0: input is from bt819
+ * input= 1: input is from ZR36060 */
+ switch (input) {
+ case 0:
+ bt856_setbit(encoder, 0xde, 4, 0);
+ bt856_setbit(encoder, 0xde, 3, 1);
+ bt856_setbit(encoder, 0xdc, 3, 1);
+ bt856_setbit(encoder, 0xdc, 6, 0);
+ break;
+ case 1:
+ bt856_setbit(encoder, 0xde, 4, 0);
+ bt856_setbit(encoder, 0xde, 3, 1);
+ bt856_setbit(encoder, 0xdc, 3, 1);
+ bt856_setbit(encoder, 0xdc, 6, 1);
+ break;
+ case 2: /* Color bar */
+ bt856_setbit(encoder, 0xdc, 3, 0);
+ bt856_setbit(encoder, 0xde, 4, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (debug != 0)
+ bt856_dump(encoder);
+ return 0;
+}
+
+static int bt856_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_BT856, 0);
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_core_ops bt856_core_ops = {
+ .g_chip_ident = bt856_g_chip_ident,
+ .init = bt856_init,
+};
+
+static const struct v4l2_subdev_video_ops bt856_video_ops = {
+ .s_std_output = bt856_s_std_output,
+ .s_routing = bt856_s_routing,
+};
+
+static const struct v4l2_subdev_ops bt856_ops = {
+ .core = &bt856_core_ops,
+ .video = &bt856_video_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int bt856_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bt856 *encoder;
+ struct v4l2_subdev *sd;
+
+ /* Check if the adapter supports the needed features */
+ 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);
+
+ encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
+ if (encoder == NULL)
+ return -ENOMEM;
+ sd = &encoder->sd;
+ v4l2_i2c_subdev_init(sd, client, &bt856_ops);
+ encoder->norm = V4L2_STD_NTSC;
+
+ bt856_write(encoder, 0xdc, 0x18);
+ bt856_write(encoder, 0xda, 0);
+ bt856_write(encoder, 0xde, 0);
+
+ bt856_setbit(encoder, 0xdc, 3, 1);
+ /*bt856_setbit(encoder, 0xdc, 6, 0);*/
+ bt856_setbit(encoder, 0xdc, 4, 1);
+
+ if (encoder->norm & V4L2_STD_NTSC)
+ bt856_setbit(encoder, 0xdc, 2, 0);
+ else
+ bt856_setbit(encoder, 0xdc, 2, 1);
+
+ bt856_setbit(encoder, 0xdc, 1, 1);
+ bt856_setbit(encoder, 0xde, 4, 0);
+ bt856_setbit(encoder, 0xde, 3, 1);
+
+ if (debug != 0)
+ bt856_dump(encoder);
+ return 0;
+}
+
+static int bt856_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+ kfree(to_bt856(sd));
+ return 0;
+}
+
+static const struct i2c_device_id bt856_id[] = {
+ { "bt856", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, bt856_id);
+
+static struct i2c_driver bt856_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "bt856",
+ },
+ .probe = bt856_probe,
+ .remove = bt856_remove,
+ .id_table = bt856_id,
+};
+
+module_i2c_driver(bt856_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 10:24:13 +0000