cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

bt856.c (6143B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
      4 *
      5 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
      6 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
      7 *
      8 * Modifications for LML33/DC10plus unified driver
      9 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
     10 *
     11 * This code was modify/ported from the saa7111 driver written
     12 * by Dave Perks.
     13 *
     14 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
     15 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
     16 */
     17
     18#include <linux/module.h>
     19#include <linux/types.h>
     20#include <linux/slab.h>
     21#include <linux/ioctl.h>
     22#include <linux/uaccess.h>
     23#include <linux/i2c.h>
     24#include <linux/videodev2.h>
     25#include <media/v4l2-device.h>
     26
     27MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
     28MODULE_AUTHOR("Mike Bernson & Dave Perks");
     29MODULE_LICENSE("GPL");
     30
     31static int debug;
     32module_param(debug, int, 0);
     33MODULE_PARM_DESC(debug, "Debug level (0-1)");
     34
     35
     36/* ----------------------------------------------------------------------- */
     37
     38#define BT856_REG_OFFSET	0xDA
     39#define BT856_NR_REG		6
     40
     41struct bt856 {
     42	struct v4l2_subdev sd;
     43	unsigned char reg[BT856_NR_REG];
     44
     45	v4l2_std_id norm;
     46};
     47
     48static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
     49{
     50	return container_of(sd, struct bt856, sd);
     51}
     52
     53/* ----------------------------------------------------------------------- */
     54
     55static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
     56{
     57	struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
     58
     59	encoder->reg[reg - BT856_REG_OFFSET] = value;
     60	return i2c_smbus_write_byte_data(client, reg, value);
     61}
     62
     63static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
     64{
     65	return bt856_write(encoder, reg,
     66		(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
     67				(value ? (1 << bit) : 0));
     68}
     69
     70static void bt856_dump(struct bt856 *encoder)
     71{
     72	int i;
     73
     74	v4l2_info(&encoder->sd, "register dump:\n");
     75	for (i = 0; i < BT856_NR_REG; i += 2)
     76		printk(KERN_CONT " %02x", encoder->reg[i]);
     77	printk(KERN_CONT "\n");
     78}
     79
     80/* ----------------------------------------------------------------------- */
     81
     82static int bt856_init(struct v4l2_subdev *sd, u32 arg)
     83{
     84	struct bt856 *encoder = to_bt856(sd);
     85
     86	/* This is just for testing!!! */
     87	v4l2_dbg(1, debug, sd, "init\n");
     88	bt856_write(encoder, 0xdc, 0x18);
     89	bt856_write(encoder, 0xda, 0);
     90	bt856_write(encoder, 0xde, 0);
     91
     92	bt856_setbit(encoder, 0xdc, 3, 1);
     93	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
     94	bt856_setbit(encoder, 0xdc, 4, 1);
     95
     96	if (encoder->norm & V4L2_STD_NTSC)
     97		bt856_setbit(encoder, 0xdc, 2, 0);
     98	else
     99		bt856_setbit(encoder, 0xdc, 2, 1);
    100
    101	bt856_setbit(encoder, 0xdc, 1, 1);
    102	bt856_setbit(encoder, 0xde, 4, 0);
    103	bt856_setbit(encoder, 0xde, 3, 1);
    104	if (debug != 0)
    105		bt856_dump(encoder);
    106	return 0;
    107}
    108
    109static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
    110{
    111	struct bt856 *encoder = to_bt856(sd);
    112
    113	v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
    114
    115	if (std & V4L2_STD_NTSC) {
    116		bt856_setbit(encoder, 0xdc, 2, 0);
    117	} else if (std & V4L2_STD_PAL) {
    118		bt856_setbit(encoder, 0xdc, 2, 1);
    119		bt856_setbit(encoder, 0xda, 0, 0);
    120		/*bt856_setbit(encoder, 0xda, 0, 1);*/
    121	} else {
    122		return -EINVAL;
    123	}
    124	encoder->norm = std;
    125	if (debug != 0)
    126		bt856_dump(encoder);
    127	return 0;
    128}
    129
    130static int bt856_s_routing(struct v4l2_subdev *sd,
    131			   u32 input, u32 output, u32 config)
    132{
    133	struct bt856 *encoder = to_bt856(sd);
    134
    135	v4l2_dbg(1, debug, sd, "set input %d\n", input);
    136
    137	/* We only have video bus.
    138	 * input= 0: input is from bt819
    139	 * input= 1: input is from ZR36060 */
    140	switch (input) {
    141	case 0:
    142		bt856_setbit(encoder, 0xde, 4, 0);
    143		bt856_setbit(encoder, 0xde, 3, 1);
    144		bt856_setbit(encoder, 0xdc, 3, 1);
    145		bt856_setbit(encoder, 0xdc, 6, 0);
    146		break;
    147	case 1:
    148		bt856_setbit(encoder, 0xde, 4, 0);
    149		bt856_setbit(encoder, 0xde, 3, 1);
    150		bt856_setbit(encoder, 0xdc, 3, 1);
    151		bt856_setbit(encoder, 0xdc, 6, 1);
    152		break;
    153	case 2:	/* Color bar */
    154		bt856_setbit(encoder, 0xdc, 3, 0);
    155		bt856_setbit(encoder, 0xde, 4, 1);
    156		break;
    157	default:
    158		return -EINVAL;
    159	}
    160
    161	if (debug != 0)
    162		bt856_dump(encoder);
    163	return 0;
    164}
    165
    166/* ----------------------------------------------------------------------- */
    167
    168static const struct v4l2_subdev_core_ops bt856_core_ops = {
    169	.init = bt856_init,
    170};
    171
    172static const struct v4l2_subdev_video_ops bt856_video_ops = {
    173	.s_std_output = bt856_s_std_output,
    174	.s_routing = bt856_s_routing,
    175};
    176
    177static const struct v4l2_subdev_ops bt856_ops = {
    178	.core = &bt856_core_ops,
    179	.video = &bt856_video_ops,
    180};
    181
    182/* ----------------------------------------------------------------------- */
    183
    184static int bt856_probe(struct i2c_client *client,
    185			const struct i2c_device_id *id)
    186{
    187	struct bt856 *encoder;
    188	struct v4l2_subdev *sd;
    189
    190	/* Check if the adapter supports the needed features */
    191	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
    192		return -ENODEV;
    193
    194	v4l_info(client, "chip found @ 0x%x (%s)\n",
    195			client->addr << 1, client->adapter->name);
    196
    197	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
    198	if (encoder == NULL)
    199		return -ENOMEM;
    200	sd = &encoder->sd;
    201	v4l2_i2c_subdev_init(sd, client, &bt856_ops);
    202	encoder->norm = V4L2_STD_NTSC;
    203
    204	bt856_write(encoder, 0xdc, 0x18);
    205	bt856_write(encoder, 0xda, 0);
    206	bt856_write(encoder, 0xde, 0);
    207
    208	bt856_setbit(encoder, 0xdc, 3, 1);
    209	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
    210	bt856_setbit(encoder, 0xdc, 4, 1);
    211
    212	if (encoder->norm & V4L2_STD_NTSC)
    213		bt856_setbit(encoder, 0xdc, 2, 0);
    214	else
    215		bt856_setbit(encoder, 0xdc, 2, 1);
    216
    217	bt856_setbit(encoder, 0xdc, 1, 1);
    218	bt856_setbit(encoder, 0xde, 4, 0);
    219	bt856_setbit(encoder, 0xde, 3, 1);
    220
    221	if (debug != 0)
    222		bt856_dump(encoder);
    223	return 0;
    224}
    225
    226static int bt856_remove(struct i2c_client *client)
    227{
    228	struct v4l2_subdev *sd = i2c_get_clientdata(client);
    229
    230	v4l2_device_unregister_subdev(sd);
    231	return 0;
    232}
    233
    234static const struct i2c_device_id bt856_id[] = {
    235	{ "bt856", 0 },
    236	{ }
    237};
    238MODULE_DEVICE_TABLE(i2c, bt856_id);
    239
    240static struct i2c_driver bt856_driver = {
    241	.driver = {
    242		.name	= "bt856",
    243	},
    244	.probe		= bt856_probe,
    245	.remove		= bt856_remove,
    246	.id_table	= bt856_id,
    247};
    248
    249module_i2c_driver(bt856_driver);