360 lines
8.5 KiB
C
360 lines
8.5 KiB
C
/*
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* Driver for AK8813 / AK8814 TV-ecoders from Asahi Kasei Microsystems Co., Ltd. (AKM)
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*
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* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/videodev2.h>
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#include <linux/module.h>
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#include <media/ak881x.h>
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#include <media/v4l2-chip-ident.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#define AK881X_INTERFACE_MODE 0
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#define AK881X_VIDEO_PROCESS1 1
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#define AK881X_VIDEO_PROCESS2 2
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#define AK881X_VIDEO_PROCESS3 3
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#define AK881X_DAC_MODE 5
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#define AK881X_STATUS 0x24
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#define AK881X_DEVICE_ID 0x25
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#define AK881X_DEVICE_REVISION 0x26
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struct ak881x {
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struct v4l2_subdev subdev;
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struct ak881x_pdata *pdata;
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unsigned int lines;
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int id; /* DEVICE_ID code V4L2_IDENT_AK881X code from v4l2-chip-ident.h */
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char revision; /* DEVICE_REVISION content */
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};
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static int reg_read(struct i2c_client *client, const u8 reg)
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{
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int reg_write(struct i2c_client *client, const u8 reg,
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const u8 data)
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{
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return i2c_smbus_write_byte_data(client, reg, data);
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}
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static int reg_set(struct i2c_client *client, const u8 reg,
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const u8 data, u8 mask)
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{
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int ret = reg_read(client, reg);
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if (ret < 0)
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return ret;
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return reg_write(client, reg, (ret & ~mask) | (data & mask));
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}
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static struct ak881x *to_ak881x(const struct i2c_client *client)
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{
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return container_of(i2c_get_clientdata(client), struct ak881x, subdev);
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}
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static int ak881x_g_chip_ident(struct v4l2_subdev *sd,
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struct v4l2_dbg_chip_ident *id)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
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return -EINVAL;
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if (id->match.addr != client->addr)
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return -ENODEV;
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id->ident = ak881x->id;
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id->revision = ak881x->revision;
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return 0;
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int ak881x_g_register(struct v4l2_subdev *sd,
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struct v4l2_dbg_register *reg)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
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return -EINVAL;
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if (reg->match.addr != client->addr)
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return -ENODEV;
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reg->val = reg_read(client, reg->reg);
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if (reg->val > 0xffff)
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return -EIO;
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return 0;
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}
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static int ak881x_s_register(struct v4l2_subdev *sd,
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const struct v4l2_dbg_register *reg)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0x26)
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return -EINVAL;
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if (reg->match.addr != client->addr)
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return -ENODEV;
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if (reg_write(client, reg->reg, reg->val) < 0)
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return -EIO;
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return 0;
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}
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#endif
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static int ak881x_try_g_mbus_fmt(struct v4l2_subdev *sd,
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struct v4l2_mbus_framefmt *mf)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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v4l_bound_align_image(&mf->width, 0, 720, 2,
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&mf->height, 0, ak881x->lines, 1, 0);
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mf->field = V4L2_FIELD_INTERLACED;
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mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
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mf->colorspace = V4L2_COLORSPACE_SMPTE170M;
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return 0;
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}
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static int ak881x_s_mbus_fmt(struct v4l2_subdev *sd,
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struct v4l2_mbus_framefmt *mf)
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{
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if (mf->field != V4L2_FIELD_INTERLACED ||
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mf->code != V4L2_MBUS_FMT_YUYV8_2X8)
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return -EINVAL;
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return ak881x_try_g_mbus_fmt(sd, mf);
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}
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static int ak881x_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
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enum v4l2_mbus_pixelcode *code)
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{
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if (index)
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return -EINVAL;
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*code = V4L2_MBUS_FMT_YUYV8_2X8;
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return 0;
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}
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static int ak881x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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a->bounds.left = 0;
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a->bounds.top = 0;
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a->bounds.width = 720;
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a->bounds.height = ak881x->lines;
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a->defrect = a->bounds;
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a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
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a->pixelaspect.numerator = 1;
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a->pixelaspect.denominator = 1;
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return 0;
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}
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static int ak881x_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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u8 vp1;
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if (std == V4L2_STD_NTSC_443) {
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vp1 = 3;
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ak881x->lines = 480;
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} else if (std == V4L2_STD_PAL_M) {
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vp1 = 5;
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ak881x->lines = 480;
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} else if (std == V4L2_STD_PAL_60) {
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vp1 = 7;
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ak881x->lines = 480;
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} else if (std && !(std & ~V4L2_STD_PAL)) {
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vp1 = 0xf;
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ak881x->lines = 576;
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} else if (std && !(std & ~V4L2_STD_NTSC)) {
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vp1 = 0;
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ak881x->lines = 480;
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} else {
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/* No SECAM or PAL_N/Nc supported */
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return -EINVAL;
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}
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reg_set(client, AK881X_VIDEO_PROCESS1, vp1, 0xf);
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return 0;
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}
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static int ak881x_s_stream(struct v4l2_subdev *sd, int enable)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct ak881x *ak881x = to_ak881x(client);
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if (enable) {
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u8 dac;
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/* For colour-bar testing set bit 6 of AK881X_VIDEO_PROCESS1 */
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/* Default: composite output */
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if (ak881x->pdata->flags & AK881X_COMPONENT)
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dac = 3;
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else
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dac = 4;
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/* Turn on the DAC(s) */
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reg_write(client, AK881X_DAC_MODE, dac);
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dev_dbg(&client->dev, "chip status 0x%x\n",
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reg_read(client, AK881X_STATUS));
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} else {
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/* ...and clear bit 6 of AK881X_VIDEO_PROCESS1 here */
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reg_write(client, AK881X_DAC_MODE, 0);
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dev_dbg(&client->dev, "chip status 0x%x\n",
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reg_read(client, AK881X_STATUS));
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}
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return 0;
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}
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static struct v4l2_subdev_core_ops ak881x_subdev_core_ops = {
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.g_chip_ident = ak881x_g_chip_ident,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = ak881x_g_register,
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.s_register = ak881x_s_register,
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#endif
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};
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static struct v4l2_subdev_video_ops ak881x_subdev_video_ops = {
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.s_mbus_fmt = ak881x_s_mbus_fmt,
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.g_mbus_fmt = ak881x_try_g_mbus_fmt,
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.try_mbus_fmt = ak881x_try_g_mbus_fmt,
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.cropcap = ak881x_cropcap,
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.enum_mbus_fmt = ak881x_enum_mbus_fmt,
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.s_std_output = ak881x_s_std_output,
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.s_stream = ak881x_s_stream,
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};
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static struct v4l2_subdev_ops ak881x_subdev_ops = {
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.core = &ak881x_subdev_core_ops,
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.video = &ak881x_subdev_video_ops,
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};
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static int ak881x_probe(struct i2c_client *client,
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const struct i2c_device_id *did)
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{
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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struct ak881x *ak881x;
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u8 ifmode, data;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_warn(&adapter->dev,
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"I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
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return -EIO;
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}
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ak881x = kzalloc(sizeof(struct ak881x), GFP_KERNEL);
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if (!ak881x)
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return -ENOMEM;
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v4l2_i2c_subdev_init(&ak881x->subdev, client, &ak881x_subdev_ops);
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data = reg_read(client, AK881X_DEVICE_ID);
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switch (data) {
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case 0x13:
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ak881x->id = V4L2_IDENT_AK8813;
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break;
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case 0x14:
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ak881x->id = V4L2_IDENT_AK8814;
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break;
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default:
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dev_err(&client->dev,
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"No ak881x chip detected, register read %x\n", data);
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kfree(ak881x);
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return -ENODEV;
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}
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ak881x->revision = reg_read(client, AK881X_DEVICE_REVISION);
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ak881x->pdata = client->dev.platform_data;
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if (ak881x->pdata) {
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if (ak881x->pdata->flags & AK881X_FIELD)
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ifmode = 4;
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else
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ifmode = 0;
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switch (ak881x->pdata->flags & AK881X_IF_MODE_MASK) {
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case AK881X_IF_MODE_BT656:
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ifmode |= 1;
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break;
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case AK881X_IF_MODE_MASTER:
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ifmode |= 2;
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break;
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case AK881X_IF_MODE_SLAVE:
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default:
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break;
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}
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dev_dbg(&client->dev, "IF mode %x\n", ifmode);
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/*
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* "Line Blanking No." seems to be the same as the number of
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* "black" lines on, e.g., SuperH VOU, whose default value of 20
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* "incidentally" matches ak881x' default
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*/
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reg_write(client, AK881X_INTERFACE_MODE, ifmode | (20 << 3));
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}
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/* Hardware default: NTSC-M */
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ak881x->lines = 480;
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dev_info(&client->dev, "Detected an ak881x chip ID %x, revision %x\n",
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data, ak881x->revision);
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return 0;
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}
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static int ak881x_remove(struct i2c_client *client)
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{
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struct ak881x *ak881x = to_ak881x(client);
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v4l2_device_unregister_subdev(&ak881x->subdev);
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kfree(ak881x);
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return 0;
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}
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static const struct i2c_device_id ak881x_id[] = {
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{ "ak8813", 0 },
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{ "ak8814", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ak881x_id);
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static struct i2c_driver ak881x_i2c_driver = {
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.driver = {
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.name = "ak881x",
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},
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.probe = ak881x_probe,
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.remove = ak881x_remove,
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.id_table = ak881x_id,
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};
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module_i2c_driver(ak881x_i2c_driver);
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MODULE_DESCRIPTION("TV-output driver for ak8813/ak8814");
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MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
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MODULE_LICENSE("GPL v2");
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