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/v4l2-chip-ident.h>
31#include <media/upd64083.h>
32
33MODULE_DESCRIPTION("uPD64083 driver");
34MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
35MODULE_LICENSE("GPL");
36
37static bool debug;
38module_param(debug, bool, 0644);
39
40MODULE_PARM_DESC(debug, "Debug level (0-1)");
41
42
43enum {
44	R00 = 0, R01, R02, R03, R04,
45	R05, R06, R07, R08, R09,
46	R0A, R0B, R0C, R0D, R0E, R0F,
47	R10, R11, R12, R13, R14,
48	R15, R16,
49	TOT_REGS
50};
51
52struct upd64083_state {
53	struct v4l2_subdev sd;
54	u8 mode;
55	u8 ext_y_adc;
56	u8 regs[TOT_REGS];
57};
58
59static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
60{
61	return container_of(sd, struct upd64083_state, sd);
62}
63
64/* Initial values when used in combination with the
65   NEC upd64031a ghost reduction chip. */
66static u8 upd64083_init[] = {
67	0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
68	0x36, 0xdd, 0x05, 0x56, 0x48,
69	0x00, 0x3a, 0xa0, 0x05, 0x08,
70	0x44, 0x60, 0x08, 0x52, 0xf8,
71	0x53, 0x60, 0x10
72};
73
74/* ------------------------------------------------------------------------ */
75
76static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
77{
78	struct i2c_client *client = v4l2_get_subdevdata(sd);
79	u8 buf[2];
80
81	buf[0] = reg;
82	buf[1] = val;
83	v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
84	if (i2c_master_send(client, buf, 2) != 2)
85		v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
86}
87
88/* ------------------------------------------------------------------------ */
89
90#ifdef CONFIG_VIDEO_ADV_DEBUG
91static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
92{
93	struct i2c_client *client = v4l2_get_subdevdata(sd);
94	u8 buf[7];
95
96	if (reg >= sizeof(buf))
97		return 0xff;
98	i2c_master_recv(client, buf, sizeof(buf));
99	return buf[reg];
100}
101#endif
102
103/* ------------------------------------------------------------------------ */
104
105static int upd64083_s_routing(struct v4l2_subdev *sd,
106			      u32 input, u32 output, u32 config)
107{
108	struct upd64083_state *state = to_state(sd);
109	u8 r00, r02;
110
111	if (input > 7 || (input & 6) == 6)
112		return -EINVAL;
113	state->mode = (input & 3) << 6;
114	state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
115	r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
116	r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
117	upd64083_write(sd, R00, r00);
118	upd64083_write(sd, R02, r02);
119	return 0;
120}
121
122#ifdef CONFIG_VIDEO_ADV_DEBUG
123static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
124{
125	struct i2c_client *client = v4l2_get_subdevdata(sd);
126
127	if (!v4l2_chip_match_i2c_client(client, &reg->match))
128		return -EINVAL;
129	if (!capable(CAP_SYS_ADMIN))
130		return -EPERM;
131	reg->val = upd64083_read(sd, reg->reg & 0xff);
132	reg->size = 1;
133	return 0;
134}
135
136static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
137{
138	struct i2c_client *client = v4l2_get_subdevdata(sd);
139
140	if (!v4l2_chip_match_i2c_client(client, &reg->match))
141		return -EINVAL;
142	if (!capable(CAP_SYS_ADMIN))
143		return -EPERM;
144	upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
145	return 0;
146}
147#endif
148
149static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
150{
151	struct i2c_client *client = v4l2_get_subdevdata(sd);
152
153	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
154}
155
156static int upd64083_log_status(struct v4l2_subdev *sd)
157{
158	struct i2c_client *client = v4l2_get_subdevdata(sd);
159	u8 buf[7];
160
161	i2c_master_recv(client, buf, 7);
162	v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
163		      "SA04=%02x SA05=%02x SA06=%02x\n",
164		buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
165	return 0;
166}
167
168/* ----------------------------------------------------------------------- */
169
170static const struct v4l2_subdev_core_ops upd64083_core_ops = {
171	.log_status = upd64083_log_status,
172	.g_chip_ident = upd64083_g_chip_ident,
173#ifdef CONFIG_VIDEO_ADV_DEBUG
174	.g_register = upd64083_g_register,
175	.s_register = upd64083_s_register,
176#endif
177};
178
179static const struct v4l2_subdev_video_ops upd64083_video_ops = {
180	.s_routing = upd64083_s_routing,
181};
182
183static const struct v4l2_subdev_ops upd64083_ops = {
184	.core = &upd64083_core_ops,
185	.video = &upd64083_video_ops,
186};
187
188/* ------------------------------------------------------------------------ */
189
190/* i2c implementation */
191
192static int upd64083_probe(struct i2c_client *client,
193			  const struct i2c_device_id *id)
194{
195	struct upd64083_state *state;
196	struct v4l2_subdev *sd;
197	int i;
198
199	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
200		return -EIO;
201
202	v4l_info(client, "chip found @ 0x%x (%s)\n",
203			client->addr << 1, client->adapter->name);
204
205	state = kzalloc(sizeof(struct upd64083_state), GFP_KERNEL);
206	if (state == NULL)
207		return -ENOMEM;
208	sd = &state->sd;
209	v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
210	/* Initially assume that a ghost reduction chip is present */
211	state->mode = 0;  /* YCS mode */
212	state->ext_y_adc = (1 << 5);
213	memcpy(state->regs, upd64083_init, TOT_REGS);
214	for (i = 0; i < TOT_REGS; i++)
215		upd64083_write(sd, i, state->regs[i]);
216	return 0;
217}
218
219static int upd64083_remove(struct i2c_client *client)
220{
221	struct v4l2_subdev *sd = i2c_get_clientdata(client);
222
223	v4l2_device_unregister_subdev(sd);
224	kfree(to_state(sd));
225	return 0;
226}
227
228/* ----------------------------------------------------------------------- */
229
230static const struct i2c_device_id upd64083_id[] = {
231	{ "upd64083", 0 },
232	{ }
233};
234MODULE_DEVICE_TABLE(i2c, upd64083_id);
235
236static struct i2c_driver upd64083_driver = {
237	.driver = {
238		.owner	= THIS_MODULE,
239		.name	= "upd64083",
240	},
241	.probe		= upd64083_probe,
242	.remove		= upd64083_remove,
243	.id_table	= upd64083_id,
244};
245
246module_i2c_driver(upd64083_driver);
247