Merge branch 'topic/drop-l3' into for-linus
[linux-2.6] / drivers / media / video / upd64083.c
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 <media/v4l2-device.h>
29 #include <media/v4l2-chip-ident.h>
30 #include <media/v4l2-i2c-drv.h>
31 #include <media/upd64083.h>
32
33 MODULE_DESCRIPTION("uPD64083 driver");
34 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
35 MODULE_LICENSE("GPL");
36
37 static int debug;
38 module_param(debug, bool, 0644);
39
40 MODULE_PARM_DESC(debug, "Debug level (0-1)");
41
42
43 enum {
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
52 struct upd64083_state {
53         struct v4l2_subdev sd;
54         u8 mode;
55         u8 ext_y_adc;
56         u8 regs[TOT_REGS];
57 };
58
59 static 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. */
66 static 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
76 static 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
91 static 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
105 static int upd64083_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
106 {
107         struct upd64083_state *state = to_state(sd);
108         u8 r00, r02;
109
110         if (route->input > 7 || (route->input & 6) == 6)
111                 return -EINVAL;
112         state->mode = (route->input & 3) << 6;
113         state->ext_y_adc = (route->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
122 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
123 {
124         struct i2c_client *client = v4l2_get_subdevdata(sd);
125
126         if (!v4l2_chip_match_i2c_client(client, &reg->match))
127                 return -EINVAL;
128         if (!capable(CAP_SYS_ADMIN))
129                 return -EPERM;
130         reg->val = upd64083_read(sd, reg->reg & 0xff);
131         reg->size = 1;
132         return 0;
133 }
134
135 static int upd64083_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
136 {
137         struct i2c_client *client = v4l2_get_subdevdata(sd);
138
139         if (!v4l2_chip_match_i2c_client(client, &reg->match))
140                 return -EINVAL;
141         if (!capable(CAP_SYS_ADMIN))
142                 return -EPERM;
143         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
144         return 0;
145 }
146 #endif
147
148 static int upd64083_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
149 {
150         struct i2c_client *client = v4l2_get_subdevdata(sd);
151
152         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64083, 0);
153 }
154
155 static int upd64083_log_status(struct v4l2_subdev *sd)
156 {
157         struct i2c_client *client = v4l2_get_subdevdata(sd);
158         u8 buf[7];
159
160         i2c_master_recv(client, buf, 7);
161         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
162                       "SA04=%02x SA05=%02x SA06=%02x\n",
163                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
164         return 0;
165 }
166
167 static int upd64083_command(struct i2c_client *client, unsigned cmd, void *arg)
168 {
169         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
170 }
171
172 /* ----------------------------------------------------------------------- */
173
174 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
175         .log_status = upd64083_log_status,
176         .g_chip_ident = upd64083_g_chip_ident,
177 #ifdef CONFIG_VIDEO_ADV_DEBUG
178         .g_register = upd64083_g_register,
179         .s_register = upd64083_s_register,
180 #endif
181 };
182
183 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
184         .s_routing = upd64083_s_routing,
185 };
186
187 static const struct v4l2_subdev_ops upd64083_ops = {
188         .core = &upd64083_core_ops,
189         .video = &upd64083_video_ops,
190 };
191
192 /* ------------------------------------------------------------------------ */
193
194 /* i2c implementation */
195
196 static int upd64083_probe(struct i2c_client *client,
197                           const struct i2c_device_id *id)
198 {
199         struct upd64083_state *state;
200         struct v4l2_subdev *sd;
201         int i;
202
203         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
204                 return -EIO;
205
206         v4l_info(client, "chip found @ 0x%x (%s)\n",
207                         client->addr << 1, client->adapter->name);
208
209         state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);
210         if (state == NULL)
211                 return -ENOMEM;
212         sd = &state->sd;
213         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
214         /* Initially assume that a ghost reduction chip is present */
215         state->mode = 0;  /* YCS mode */
216         state->ext_y_adc = (1 << 5);
217         memcpy(state->regs, upd64083_init, TOT_REGS);
218         for (i = 0; i < TOT_REGS; i++)
219                 upd64083_write(sd, i, state->regs[i]);
220         return 0;
221 }
222
223 static int upd64083_remove(struct i2c_client *client)
224 {
225         struct v4l2_subdev *sd = i2c_get_clientdata(client);
226
227         v4l2_device_unregister_subdev(sd);
228         kfree(to_state(sd));
229         return 0;
230 }
231
232 /* ----------------------------------------------------------------------- */
233
234 static const struct i2c_device_id upd64083_id[] = {
235         { "upd64083", 0 },
236         { }
237 };
238 MODULE_DEVICE_TABLE(i2c, upd64083_id);
239
240 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
241         .name = "upd64083",
242         .driverid = I2C_DRIVERID_UPD64083,
243         .command = upd64083_command,
244         .probe = upd64083_probe,
245         .remove = upd64083_remove,
246         .id_table = upd64083_id,
247 };