1 /*
2 * wm8775 - driver version 0.0.1
3 *
4 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
5 *
6 * Based on saa7115 driver
7 *
8 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
9 * - Cleanup
10 * - V4L2 API update
11 * - sound fixes
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/ioctl.h>
31 #include <asm/uaccess.h>
32 #include <linux/i2c.h>
33 #include <linux/i2c-id.h>
34 #include <linux/videodev2.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-chip-ident.h>
37 #include <media/v4l2-i2c-drv-legacy.h>
38
39 MODULE_DESCRIPTION("wm8775 driver");
40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
41 MODULE_LICENSE("GPL");
42
43 static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
44
45 I2C_CLIENT_INSMOD;
46
47
48 /* ----------------------------------------------------------------------- */
49
50 enum {
51 R7 = 7, R11 = 11,
52 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
53 TOT_REGS
54 };
55
56 struct wm8775_state {
57 struct v4l2_subdev sd;
58 u8 input; /* Last selected input (0-0xf) */
59 u8 muted;
60 };
61
to_state(struct v4l2_subdev * sd)62 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd)
63 {
64 return container_of(sd, struct wm8775_state, sd);
65 }
66
wm8775_write(struct v4l2_subdev * sd,int reg,u16 val)67 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val)
68 {
69 struct i2c_client *client = v4l2_get_subdevdata(sd);
70 int i;
71
72 if (reg < 0 || reg >= TOT_REGS) {
73 v4l2_err(sd, "Invalid register R%d\n", reg);
74 return -1;
75 }
76
77 for (i = 0; i < 3; i++)
78 if (i2c_smbus_write_byte_data(client,
79 (reg << 1) | (val >> 8), val & 0xff) == 0)
80 return 0;
81 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
82 return -1;
83 }
84
wm8775_s_routing(struct v4l2_subdev * sd,const struct v4l2_routing * route)85 static int wm8775_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
86 {
87 struct wm8775_state *state = to_state(sd);
88
89 /* There are 4 inputs and one output. Zero or more inputs
90 are multiplexed together to the output. Hence there are
91 16 combinations.
92 If only one input is active (the normal case) then the
93 input values 1, 2, 4 or 8 should be used. */
94 if (route->input > 15) {
95 v4l2_err(sd, "Invalid input %d.\n", route->input);
96 return -EINVAL;
97 }
98 state->input = route->input;
99 if (state->muted)
100 return 0;
101 wm8775_write(sd, R21, 0x0c0);
102 wm8775_write(sd, R14, 0x1d4);
103 wm8775_write(sd, R15, 0x1d4);
104 wm8775_write(sd, R21, 0x100 + state->input);
105 return 0;
106 }
107
wm8775_g_ctrl(struct v4l2_subdev * sd,struct v4l2_control * ctrl)108 static int wm8775_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
109 {
110 struct wm8775_state *state = to_state(sd);
111
112 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
113 return -EINVAL;
114 ctrl->value = state->muted;
115 return 0;
116 }
117
wm8775_s_ctrl(struct v4l2_subdev * sd,struct v4l2_control * ctrl)118 static int wm8775_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
119 {
120 struct wm8775_state *state = to_state(sd);
121
122 if (ctrl->id != V4L2_CID_AUDIO_MUTE)
123 return -EINVAL;
124 state->muted = ctrl->value;
125 wm8775_write(sd, R21, 0x0c0);
126 wm8775_write(sd, R14, 0x1d4);
127 wm8775_write(sd, R15, 0x1d4);
128 if (!state->muted)
129 wm8775_write(sd, R21, 0x100 + state->input);
130 return 0;
131 }
132
wm8775_g_chip_ident(struct v4l2_subdev * sd,struct v4l2_dbg_chip_ident * chip)133 static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
134 {
135 struct i2c_client *client = v4l2_get_subdevdata(sd);
136
137 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0);
138 }
139
wm8775_log_status(struct v4l2_subdev * sd)140 static int wm8775_log_status(struct v4l2_subdev *sd)
141 {
142 struct wm8775_state *state = to_state(sd);
143
144 v4l2_info(sd, "Input: %d%s\n", state->input,
145 state->muted ? " (muted)" : "");
146 return 0;
147 }
148
wm8775_s_frequency(struct v4l2_subdev * sd,struct v4l2_frequency * freq)149 static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq)
150 {
151 struct wm8775_state *state = to_state(sd);
152
153 /* If I remove this, then it can happen that I have no
154 sound the first time I tune from static to a valid channel.
155 It's difficult to reproduce and is almost certainly related
156 to the zero cross detect circuit. */
157 wm8775_write(sd, R21, 0x0c0);
158 wm8775_write(sd, R14, 0x1d4);
159 wm8775_write(sd, R15, 0x1d4);
160 wm8775_write(sd, R21, 0x100 + state->input);
161 return 0;
162 }
163
wm8775_command(struct i2c_client * client,unsigned cmd,void * arg)164 static int wm8775_command(struct i2c_client *client, unsigned cmd, void *arg)
165 {
166 return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
167 }
168
169 /* ----------------------------------------------------------------------- */
170
171 static const struct v4l2_subdev_core_ops wm8775_core_ops = {
172 .log_status = wm8775_log_status,
173 .g_chip_ident = wm8775_g_chip_ident,
174 .g_ctrl = wm8775_g_ctrl,
175 .s_ctrl = wm8775_s_ctrl,
176 };
177
178 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = {
179 .s_frequency = wm8775_s_frequency,
180 };
181
182 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = {
183 .s_routing = wm8775_s_routing,
184 };
185
186 static const struct v4l2_subdev_ops wm8775_ops = {
187 .core = &wm8775_core_ops,
188 .tuner = &wm8775_tuner_ops,
189 .audio = &wm8775_audio_ops,
190 };
191
192 /* ----------------------------------------------------------------------- */
193
194 /* i2c implementation */
195
196 /*
197 * Generic i2c probe
198 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
199 */
200
wm8775_probe(struct i2c_client * client,const struct i2c_device_id * id)201 static int wm8775_probe(struct i2c_client *client,
202 const struct i2c_device_id *id)
203 {
204 struct wm8775_state *state;
205 struct v4l2_subdev *sd;
206
207 /* Check if the adapter supports the needed features */
208 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
209 return -EIO;
210
211 v4l_info(client, "chip found @ 0x%02x (%s)\n",
212 client->addr << 1, client->adapter->name);
213
214 state = kmalloc(sizeof(struct wm8775_state), GFP_KERNEL);
215 if (state == NULL)
216 return -ENOMEM;
217 sd = &state->sd;
218 v4l2_i2c_subdev_init(sd, client, &wm8775_ops);
219 state->input = 2;
220 state->muted = 0;
221
222 /* Initialize wm8775 */
223
224 /* RESET */
225 wm8775_write(sd, R23, 0x000);
226 /* Disable zero cross detect timeout */
227 wm8775_write(sd, R7, 0x000);
228 /* Left justified, 24-bit mode */
229 wm8775_write(sd, R11, 0x021);
230 /* Master mode, clock ratio 256fs */
231 wm8775_write(sd, R12, 0x102);
232 /* Powered up */
233 wm8775_write(sd, R13, 0x000);
234 /* ADC gain +2.5dB, enable zero cross */
235 wm8775_write(sd, R14, 0x1d4);
236 /* ADC gain +2.5dB, enable zero cross */
237 wm8775_write(sd, R15, 0x1d4);
238 /* ALC Stereo, ALC target level -1dB FS max gain +8dB */
239 wm8775_write(sd, R16, 0x1bf);
240 /* Enable gain control, use zero cross detection,
241 ALC hold time 42.6 ms */
242 wm8775_write(sd, R17, 0x185);
243 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */
244 wm8775_write(sd, R18, 0x0a2);
245 /* Enable noise gate, threshold -72dBfs */
246 wm8775_write(sd, R19, 0x005);
247 /* Transient window 4ms, lower PGA gain limit -1dB */
248 wm8775_write(sd, R20, 0x07a);
249 /* LRBOTH = 1, use input 2. */
250 wm8775_write(sd, R21, 0x102);
251 return 0;
252 }
253
wm8775_remove(struct i2c_client * client)254 static int wm8775_remove(struct i2c_client *client)
255 {
256 struct v4l2_subdev *sd = i2c_get_clientdata(client);
257
258 v4l2_device_unregister_subdev(sd);
259 kfree(to_state(sd));
260 return 0;
261 }
262
263 static const struct i2c_device_id wm8775_id[] = {
264 { "wm8775", 0 },
265 { }
266 };
267 MODULE_DEVICE_TABLE(i2c, wm8775_id);
268
269 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
270 .name = "wm8775",
271 .driverid = I2C_DRIVERID_WM8775,
272 .command = wm8775_command,
273 .probe = wm8775_probe,
274 .remove = wm8775_remove,
275 .id_table = wm8775_id,
276 };
277