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@xs4all.nl>
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, count: 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, count: 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, reg: R00, val: r00);
103 upd64083_write(sd, reg: R02, val: 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->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->reg & 0xff, val: 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, count: 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(adap: 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(dev: &client->dev, size: sizeof(*state), GFP_KERNEL);
170 if (state == NULL)
171 return -ENOMEM;
172 sd = &state->sd;
173 v4l2_i2c_subdev_init(sd, client, ops: &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, reg: i, val: 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);
208

source code of linux/drivers/media/i2c/upd64083.c