upd64083.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
  4 *
  5 * 2003 by T.Adachi (tadachi@tadachi-net.com)
  6 * 2003 by Takeru KOMORIYA <komoriya@paken.org>
  7 * 2006 by Hans Verkuil <hverkuil@kernel.org>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/kernel.h>
 12#include <linux/i2c.h>
 13#include <linux/videodev2.h>
 14#include <linux/slab.h>
 15#include <media/v4l2-device.h>
 16#include <media/i2c/upd64083.h>
 17
 18MODULE_DESCRIPTION("uPD64083 driver");
 19MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
 20MODULE_LICENSE("GPL");
 21
 22static bool debug;
 23module_param(debug, bool, 0644);
 24
 25MODULE_PARM_DESC(debug, "Debug level (0-1)");
 26
 27
 28enum {
 29	R00 = 0, R01, R02, R03, R04,
 30	R05, R06, R07, R08, R09,
 31	R0A, R0B, R0C, R0D, R0E, R0F,
 32	R10, R11, R12, R13, R14,
 33	R15, R16,
 34	TOT_REGS
 35};
 36
 37struct upd64083_state {
 38	struct v4l2_subdev sd;
 39	u8 mode;
 40	u8 ext_y_adc;
 41	u8 regs[TOT_REGS];
 42};
 43
 44static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
 45{
 46	return container_of(sd, struct upd64083_state, sd);
 47}
 48
 49/* Initial values when used in combination with the
 50   NEC upd64031a ghost reduction chip. */
 51static u8 upd64083_init[] = {
 52	0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
 53	0x36, 0xdd, 0x05, 0x56, 0x48,
 54	0x00, 0x3a, 0xa0, 0x05, 0x08,
 55	0x44, 0x60, 0x08, 0x52, 0xf8,
 56	0x53, 0x60, 0x10
 57};
 58
 59/* ------------------------------------------------------------------------ */
 60
 61static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
 62{
 63	struct i2c_client *client = v4l2_get_subdevdata(sd);
 64	u8 buf[2];
 65
 66	buf[0] = reg;
 67	buf[1] = val;
 68	v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
 69	if (i2c_master_send(client, buf, 2) != 2)
 70		v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
 71}
 72
 73/* ------------------------------------------------------------------------ */
 74
 75#ifdef CONFIG_VIDEO_ADV_DEBUG
 76static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
 77{
 78	struct i2c_client *client = v4l2_get_subdevdata(sd);
 79	u8 buf[7];
 80
 81	if (reg >= sizeof(buf))
 82		return 0xff;
 83	i2c_master_recv(client, buf, sizeof(buf));
 84	return buf[reg];
 85}
 86#endif
 87
 88/* ------------------------------------------------------------------------ */
 89
 90static int upd64083_s_routing(struct v4l2_subdev *sd,
 91			      u32 input, u32 output, u32 config)
 92{
 93	struct upd64083_state *state = to_state(sd);
 94	u8 r00, r02;
 95
 96	if (input > 7 || (input & 6) == 6)
 97		return -EINVAL;
 98	state->mode = (input & 3) << 6;
 99	state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
100	r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
101	r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
102	upd64083_write(sd, R00, r00);
103	upd64083_write(sd, R02, r02);
104	return 0;
105}
106
107#ifdef CONFIG_VIDEO_ADV_DEBUG
108static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
109{
110	reg->val = upd64083_read(sd, reg->reg & 0xff);
111	reg->size = 1;
112	return 0;
113}
114
115static int upd64083_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
116{
117	upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
118	return 0;
119}
120#endif
121
122static int upd64083_log_status(struct v4l2_subdev *sd)
123{
124	struct i2c_client *client = v4l2_get_subdevdata(sd);
125	u8 buf[7];
126
127	i2c_master_recv(client, buf, 7);
128	v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
129		      "SA04=%02x SA05=%02x SA06=%02x\n",
130		buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
131	return 0;
132}
133
134/* ----------------------------------------------------------------------- */
135
136static const struct v4l2_subdev_core_ops upd64083_core_ops = {
137	.log_status = upd64083_log_status,
138#ifdef CONFIG_VIDEO_ADV_DEBUG
139	.g_register = upd64083_g_register,
140	.s_register = upd64083_s_register,
141#endif
142};
143
144static const struct v4l2_subdev_video_ops upd64083_video_ops = {
145	.s_routing = upd64083_s_routing,
146};
147
148static const struct v4l2_subdev_ops upd64083_ops = {
149	.core = &upd64083_core_ops,
150	.video = &upd64083_video_ops,
151};
152
153/* ------------------------------------------------------------------------ */
154
155/* i2c implementation */
156
157static int upd64083_probe(struct i2c_client *client)
158{
159	struct upd64083_state *state;
160	struct v4l2_subdev *sd;
161	int i;
162
163	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
164		return -EIO;
165
166	v4l_info(client, "chip found @ 0x%x (%s)\n",
167			client->addr << 1, client->adapter->name);
168
169	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
170	if (state == NULL)
171		return -ENOMEM;
172	sd = &state->sd;
173	v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
174	/* Initially assume that a ghost reduction chip is present */
175	state->mode = 0;  /* YCS mode */
176	state->ext_y_adc = (1 << 5);
177	memcpy(state->regs, upd64083_init, TOT_REGS);
178	for (i = 0; i < TOT_REGS; i++)
179		upd64083_write(sd, i, state->regs[i]);
180	return 0;
181}
182
183static void upd64083_remove(struct i2c_client *client)
184{
185	struct v4l2_subdev *sd = i2c_get_clientdata(client);
186
187	v4l2_device_unregister_subdev(sd);
188}
189
190/* ----------------------------------------------------------------------- */
191
192static const struct i2c_device_id upd64083_id[] = {
193	{ "upd64083" },
194	{ }
195};
196MODULE_DEVICE_TABLE(i2c, upd64083_id);
197
198static struct i2c_driver upd64083_driver = {
199	.driver = {
200		.name	= "upd64083",
201	},
202	.probe		= upd64083_probe,
203	.remove		= upd64083_remove,
204	.id_table	= upd64083_id,
205};
206
207module_i2c_driver(upd64083_driver);