--- /dev/null
+/*
+ * Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
+ *
+ * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * 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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+
+#include <media/ak881x.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+
+#define AK881X_INTERFACE_MODE 0
+#define AK881X_VIDEO_PROCESS1 1
+#define AK881X_VIDEO_PROCESS2 2
+#define AK881X_VIDEO_PROCESS3 3
+#define AK881X_DAC_MODE 5
+#define AK881X_STATUS 0x24
+#define AK881X_DEVICE_ID 0x25
+#define AK881X_DEVICE_REVISION 0x26
+
+struct ak881x {
+ struct v4l2_subdev subdev;
+ struct ak881x_pdata *pdata;
+ unsigned int lines;
+ int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
+ char revision; /* DEVICE_REVISION content */
+};
+
+static int reg_read(struct i2c_client *client, const u8 reg)
+{
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int reg_write(struct i2c_client *client, const u8 reg,
+ const u8 data)
+{
+ return i2c_smbus_write_byte_data(client, reg, data);
+}
+
+static int reg_set(struct i2c_client *client, const u8 reg,
+ const u8 data, u8 mask)
+{
+ int ret = reg_read(client, reg);
+ if (ret < 0)
+ return ret;
+ return reg_write(client, reg, (ret & ~mask) | (data & mask));
+}
+
+static struct ak881x *to_ak881x(const struct i2c_client *client)
+{
+ return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
+}
+
+static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
+ struct v4l2_dbg_chip_ident *id)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ak881x *ak881x = to_ak881x(client);
+
+ if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
+ return -EINVAL;
+
+ if (id->match.addr != client->addr)
+ return -ENODEV;
+
+ id->ident = ak881x->id;
+ id->revision = ak881x->revision;
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int ak881x_g_register(struct v4l2_subdev *sd,
+ struct v4l2_dbg_register *reg)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
+ return -EINVAL;
+
+ if (reg->match.addr != client->addr)
+ return -ENODEV;
+
+ reg->val = reg_read(client, reg->reg);
+
+ if (reg->val > 0xffff)
+ return -EIO;
+
+ return 0;
+}
+
+static int ak881x_s_register(struct v4l2_subdev *sd,
+ struct v4l2_dbg_register *reg)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
+ return -EINVAL;
+
+ if (reg->match.addr != client->addr)
+ return -ENODEV;
+
+ if (reg_write(client, reg->reg, reg->val) < 0)
+ return -EIO;
+
+ return 0;
+}
+#endif
+
+static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
+ struct v4l2_mbus_framefmt *mf)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ak881x *ak881x = to_ak881x(client);
+
+ v4l_bound_align_image(&mf->width, 0, 720, 2,
+ &mf->height, 0, ak881x->lines, 1, 0);
+ mf->field = V4L2_FIELD_INTERLACED;
+ mf->code = V4L2_MBUS_FMT_YUYV8_2X8_LE;
+ mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+ return 0;
+}
+
+static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
+ struct v4l2_mbus_framefmt *mf)
+{
+ if (mf->field != V4L2_FIELD_INTERLACED ||
+ mf->code != V4L2_MBUS_FMT_YUYV8_2X8_LE)
+ return -EINVAL;
+
+ return ak881x_try_g_mbus_fmt(sd, mf);
+}
+
+static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, int index,
+ enum v4l2_mbus_pixelcode *code)
+{
+ if (index)
+ return -EINVAL;
+
+ *code = V4L2_MBUS_FMT_YUYV8_2X8_LE;
+ return 0;
+}
+
+static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ak881x *ak881x = to_ak881x(client);
+
+ a->bounds.left = 0;
+ a->bounds.top = 0;
+ a->bounds.width = 720;
+ a->bounds.height = ak881x->lines;
+ a->defrect = a->bounds;
+ a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ a->pixelaspect.numerator = 1;
+ a->pixelaspect.denominator = 1;
+
+ return 0;
+}
+
+static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ak881x *ak881x = to_ak881x(client);
+ u8 vp1;
+
+ if (std == V4L2_STD_NTSC_443) {
+ vp1 = 3;
+ ak881x->lines = 480;
+ } else if (std == V4L2_STD_PAL_M) {
+ vp1 = 5;
+ ak881x->lines = 480;
+ } else if (std == V4L2_STD_PAL_60) {
+ vp1 = 7;
+ ak881x->lines = 480;
+ } else if (std && !(std & ~V4L2_STD_PAL)) {
+ vp1 = 0xf;
+ ak881x->lines = 576;
+ } else if (std && !(std & ~V4L2_STD_NTSC)) {
+ vp1 = 0;
+ ak881x->lines = 480;
+ } else {
+ /* No SECAM or PAL_N/Nc supported */
+ return -EINVAL;
+ }
+
+ reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
+
+ return 0;
+}
+
+static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ struct ak881x *ak881x = to_ak881x(client);
+
+ if (enable) {
+ u8 dac;
+ /* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
+ /* Default: composite output */
+ if (ak881x->pdata->flags & AK881X_COMPONENT)
+ dac = 3;
+ else
+ dac = 4;
+ /* Turn on the DAC(s) */
+ reg_write(client, AK881X_DAC_MODE, dac);
+ dev_dbg(&client->dev, "chip status 0x%x\n",
+ reg_read(client, AK881X_STATUS));
+ } else {
+ /* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
+ reg_write(client, AK881X_DAC_MODE, 0);
+ dev_dbg(&client->dev, "chip status 0x%x\n",
+ reg_read(client, AK881X_STATUS));
+ }
+
+ return 0;
+}
+
+static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
+ .g_chip_ident = ak881x_g_chip_ident,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .g_register = ak881x_g_register,
+ .s_register = ak881x_s_register,
+#endif
+};
+
+static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
+ .s_mbus_fmt = ak881x_s_mbus_fmt,
+ .g_mbus_fmt = ak881x_try_g_mbus_fmt,
+ .try_mbus_fmt = ak881x_try_g_mbus_fmt,
+ .cropcap = ak881x_cropcap,
+ .enum_mbus_fmt = ak881x_enum_mbus_fmt,
+ .s_std_output = ak881x_s_std_output,
+ .s_stream = ak881x_s_stream,
+};
+
+static struct v4l2_subdev_ops ak881x_subdev_ops = {
+ .core = &ak881x_subdev_core_ops,
+ .video = &ak881x_subdev_video_ops,
+};
+
+static int ak881x_probe(struct i2c_client *client,
+ const struct i2c_device_id *did)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct ak881x *ak881x;
+ u8 ifmode, data;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_warn(&adapter->dev,
+ "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
+ return -EIO;
+ }
+
+ ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
+ if (!ak881x)
+ return -ENOMEM;
+
+ v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
+
+ data = reg_read(client, AK881X_DEVICE_ID);
+
+ switch (data) {
+ case 0x13:
+ ak881x->id = V4L2_IDENT_AK8813;
+ break;
+ case 0x14:
+ ak881x->id = V4L2_IDENT_AK8814;
+ break;
+ default:
+ dev_err(&client->dev,
+ "No ak881x chip detected, register read %x\n", data);
+ kfree(ak881x);
+ return -ENODEV;
+ }
+
+ ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
+ ak881x->pdata = client->dev.platform_data;
+
+ if (ak881x->pdata) {
+ if (ak881x->pdata->flags & AK881X_FIELD)
+ ifmode = 4;
+ else
+ ifmode = 0;
+
+ switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
+ case AK881X_IF_MODE_BT656:
+ ifmode |= 1;
+ break;
+ case AK881X_IF_MODE_MASTER:
+ ifmode |= 2;
+ break;
+ case AK881X_IF_MODE_SLAVE:
+ default:
+ break;
+ }
+
+ dev_dbg(&client->dev, "IF mode %x\n", ifmode);
+
+ /*
+ * "Line Blanking No." seems to be the same as the number of
+ * "black" lines on, e.g., SuperH VOU, whose default value of 20
+ * "incidentally" matches ak881x' default
+ */
+ reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
+ }
+
+ /* Hardware default: NTSC-M */
+ ak881x->lines = 480;
+
+ dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
+ data, ak881x->revision);
+
+ return 0;
+}
+
+static int ak881x_remove(struct i2c_client *client)
+{
+ struct ak881x *ak881x = to_ak881x(client);
+
+ v4l2_device_unregister_subdev(&ak881x->subdev);
+ kfree(ak881x);
+
+ return 0;
+}
+
+static const struct i2c_device_id ak881x_id[] = {
+ { "ak8813", 0 },
+ { "ak8814", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ak881x_id);
+
+static struct i2c_driver ak881x_i2c_driver = {
+ .driver = {
+ .name = "ak881x",
+ },
+ .probe = ak881x_probe,
+ .remove = ak881x_remove,
+ .id_table = ak881x_id,
+};
+
+static int __init ak881x_module_init(void)
+{
+ return i2c_add_driver(&ak881x_i2c_driver);
+}
+
+static void __exit ak881x_module_exit(void)
+{
+ i2c_del_driver(&ak881x_i2c_driver);
+}
+
+module_init(ak881x_module_init);
+module_exit(ak881x_module_exit);
+
+MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_LICENSE("GPL v2");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff