1/*
2 * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
3 *
4 * 2003 by T.Adachi (tadachi@tadachi-net.com)
5 * 2003 by Takeru KOMORIYA <komoriya@paken.org>
6 * 2006 by Hans Verkuil <hverkuil@xs4all.nl>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301, USA.
22 */
23
24#include <linux/module.h>
25#include <linux/kernel.h>
26#include <linux/i2c.h>
27#include <linux/videodev2.h>
28#include <linux/slab.h>
29#include <media/v4l2-device.h>
30#include <media/upd64083.h>
31
32MODULE_DESCRIPTION("uPD64083 driver");
33MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
34MODULE_LICENSE("GPL");
35
36static bool debug;
37module_param(debug, bool, 0644);
38
39MODULE_PARM_DESC(debug, "Debug level (0-1)");
40
41
42enum {
43	R00 = 0, R01, R02, R03, R04,
44	R05, R06, R07, R08, R09,
45	R0A, R0B, R0C, R0D, R0E, R0F,
46	R10, R11, R12, R13, R14,
47	R15, R16,
48	TOT_REGS
49};
50
51struct upd64083_state {
52	struct v4l2_subdev sd;
53	u8 mode;
54	u8 ext_y_adc;
55	u8 regs[TOT_REGS];
56};
57
58static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
59{
60	return container_of(sd, struct upd64083_state, sd);
61}
62
63/* Initial values when used in combination with the
64   NEC upd64031a ghost reduction chip. */
65static u8 upd64083_init[] = {
66	0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
67	0x36, 0xdd, 0x05, 0x56, 0x48,
68	0x00, 0x3a, 0xa0, 0x05, 0x08,
69	0x44, 0x60, 0x08, 0x52, 0xf8,
70	0x53, 0x60, 0x10
71};
72
73/* ------------------------------------------------------------------------ */
74
75static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
76{
77	struct i2c_client *client = v4l2_get_subdevdata(sd);
78	u8 buf[2];
79
80	buf[0] = reg;
81	buf[1] = val;
82	v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
83	if (i2c_master_send(client, buf, 2) != 2)
84		v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
85}
86
87/* ------------------------------------------------------------------------ */
88
89#ifdef CONFIG_VIDEO_ADV_DEBUG
90static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
91{
92	struct i2c_client *client = v4l2_get_subdevdata(sd);
93	u8 buf[7];
94
95	if (reg >= sizeof(buf))
96		return 0xff;
97	i2c_master_recv(client, buf, sizeof(buf));
98	return buf[reg];
99}
100#endif
101
102/* ------------------------------------------------------------------------ */
103
104static int upd64083_s_routing(struct v4l2_subdev *sd,
105			      u32 input, u32 output, u32 config)
106{
107	struct upd64083_state *state = to_state(sd);
108	u8 r00, r02;
109
110	if (input > 7 || (input & 6) == 6)
111		return -EINVAL;
112	state->mode = (input & 3) << 6;
113	state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
114	r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
115	r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
116	upd64083_write(sd, R00, r00);
117	upd64083_write(sd, R02, r02);
118	return 0;
119}
120
121#ifdef CONFIG_VIDEO_ADV_DEBUG
122static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
123{
124	reg->val = upd64083_read(sd, reg->reg & 0xff);
125	reg->size = 1;
126	return 0;
127}
128
129static int upd64083_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
130{
131	upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
132	return 0;
133}
134#endif
135
136static int upd64083_log_status(struct v4l2_subdev *sd)
137{
138	struct i2c_client *client = v4l2_get_subdevdata(sd);
139	u8 buf[7];
140
141	i2c_master_recv(client, buf, 7);
142	v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
143		      "SA04=%02x SA05=%02x SA06=%02x\n",
144		buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
145	return 0;
146}
147
148/* ----------------------------------------------------------------------- */
149
150static const struct v4l2_subdev_core_ops upd64083_core_ops = {
151	.log_status = upd64083_log_status,
152#ifdef CONFIG_VIDEO_ADV_DEBUG
153	.g_register = upd64083_g_register,
154	.s_register = upd64083_s_register,
155#endif
156};
157
158static const struct v4l2_subdev_video_ops upd64083_video_ops = {
159	.s_routing = upd64083_s_routing,
160};
161
162static const struct v4l2_subdev_ops upd64083_ops = {
163	.core = &upd64083_core_ops,
164	.video = &upd64083_video_ops,
165};
166
167/* ------------------------------------------------------------------------ */
168
169/* i2c implementation */
170
171static int upd64083_probe(struct i2c_client *client,
172			  const struct i2c_device_id *id)
173{
174	struct upd64083_state *state;
175	struct v4l2_subdev *sd;
176	int i;
177
178	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
179		return -EIO;
180
181	v4l_info(client, "chip found @ 0x%x (%s)\n",
182			client->addr << 1, client->adapter->name);
183
184	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
185	if (state == NULL)
186		return -ENOMEM;
187	sd = &state->sd;
188	v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
189	/* Initially assume that a ghost reduction chip is present */
190	state->mode = 0;  /* YCS mode */
191	state->ext_y_adc = (1 << 5);
192	memcpy(state->regs, upd64083_init, TOT_REGS);
193	for (i = 0; i < TOT_REGS; i++)
194		upd64083_write(sd, i, state->regs[i]);
195	return 0;
196}
197
198static int upd64083_remove(struct i2c_client *client)
199{
200	struct v4l2_subdev *sd = i2c_get_clientdata(client);
201
202	v4l2_device_unregister_subdev(sd);
203	return 0;
204}
205
206/* ----------------------------------------------------------------------- */
207
208static const struct i2c_device_id upd64083_id[] = {
209	{ "upd64083", 0 },
210	{ }
211};
212MODULE_DEVICE_TABLE(i2c, upd64083_id);
213
214static struct i2c_driver upd64083_driver = {
215	.driver = {
216		.name	= "upd64083",
217	},
218	.probe		= upd64083_probe,
219	.remove		= upd64083_remove,
220	.id_table	= upd64083_id,
221};
222
223module_i2c_driver(upd64083_driver);
224