1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * wm8739
4 *
5 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
6 *
7 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
8 * - Cleanup
9 */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/ioctl.h>
15 #include <linux/uaccess.h>
16 #include <linux/i2c.h>
17 #include <linux/videodev2.h>
18 #include <media/v4l2-device.h>
19 #include <media/v4l2-ctrls.h>
20
21 MODULE_DESCRIPTION("wm8739 driver");
22 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
23 MODULE_LICENSE("GPL");
24
25 static int debug;
26
27 module_param(debug, int, 0644);
28
29 MODULE_PARM_DESC(debug, "Debug level (0-1)");
30
31
32 /* ------------------------------------------------------------------------ */
33
34 enum {
35 R0 = 0, R1,
36 R5 = 5, R6, R7, R8, R9, R15 = 15,
37 TOT_REGS
38 };
39
40 struct wm8739_state {
41 struct v4l2_subdev sd;
42 struct v4l2_ctrl_handler hdl;
43 struct {
44 /* audio cluster */
45 struct v4l2_ctrl *volume;
46 struct v4l2_ctrl *mute;
47 struct v4l2_ctrl *balance;
48 };
49 u32 clock_freq;
50 };
51
to_state(struct v4l2_subdev * sd)52 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
53 {
54 return container_of(sd, struct wm8739_state, sd);
55 }
56
to_sd(struct v4l2_ctrl * ctrl)57 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
58 {
59 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
60 }
61
62 /* ------------------------------------------------------------------------ */
63
wm8739_write(struct v4l2_subdev * sd,int reg,u16 val)64 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
65 {
66 struct i2c_client *client = v4l2_get_subdevdata(sd);
67 int i;
68
69 if (reg < 0 || reg >= TOT_REGS) {
70 v4l2_err(sd, "Invalid register R%d\n", reg);
71 return -1;
72 }
73
74 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
75
76 for (i = 0; i < 3; i++)
77 if (i2c_smbus_write_byte_data(client,
78 (reg << 1) | (val >> 8), val & 0xff) == 0)
79 return 0;
80 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
81 return -1;
82 }
83
wm8739_s_ctrl(struct v4l2_ctrl * ctrl)84 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
85 {
86 struct v4l2_subdev *sd = to_sd(ctrl);
87 struct wm8739_state *state = to_state(sd);
88 unsigned int work_l, work_r;
89 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
90 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
91 u16 mute;
92
93 switch (ctrl->id) {
94 case V4L2_CID_AUDIO_VOLUME:
95 break;
96
97 default:
98 return -EINVAL;
99 }
100
101 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
102 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
103 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
104
105 vol_l = (long)work_l * 31 / 65535;
106 vol_r = (long)work_r * 31 / 65535;
107
108 /* set audio volume etc. */
109 mute = state->mute->val ? 0x80 : 0;
110
111 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
112 * Default setting: 0x17 = 0 dB
113 */
114 wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
115 wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
116 return 0;
117 }
118
119 /* ------------------------------------------------------------------------ */
120
wm8739_s_clock_freq(struct v4l2_subdev * sd,u32 audiofreq)121 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
122 {
123 struct wm8739_state *state = to_state(sd);
124
125 state->clock_freq = audiofreq;
126 /* de-activate */
127 wm8739_write(sd, R9, 0x000);
128 switch (audiofreq) {
129 case 44100:
130 /* 256fps, fs=44.1k */
131 wm8739_write(sd, R8, 0x020);
132 break;
133 case 48000:
134 /* 256fps, fs=48k */
135 wm8739_write(sd, R8, 0x000);
136 break;
137 case 32000:
138 /* 256fps, fs=32k */
139 wm8739_write(sd, R8, 0x018);
140 break;
141 default:
142 break;
143 }
144 /* activate */
145 wm8739_write(sd, R9, 0x001);
146 return 0;
147 }
148
wm8739_log_status(struct v4l2_subdev * sd)149 static int wm8739_log_status(struct v4l2_subdev *sd)
150 {
151 struct wm8739_state *state = to_state(sd);
152
153 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
154 v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
155 return 0;
156 }
157
158 /* ----------------------------------------------------------------------- */
159
160 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
161 .s_ctrl = wm8739_s_ctrl,
162 };
163
164 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
165 .log_status = wm8739_log_status,
166 };
167
168 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
169 .s_clock_freq = wm8739_s_clock_freq,
170 };
171
172 static const struct v4l2_subdev_ops wm8739_ops = {
173 .core = &wm8739_core_ops,
174 .audio = &wm8739_audio_ops,
175 };
176
177 /* ------------------------------------------------------------------------ */
178
179 /* i2c implementation */
180
wm8739_probe(struct i2c_client * client)181 static int wm8739_probe(struct i2c_client *client)
182 {
183 struct wm8739_state *state;
184 struct v4l2_subdev *sd;
185
186 /* Check if the adapter supports the needed features */
187 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
188 return -EIO;
189
190 v4l_info(client, "chip found @ 0x%x (%s)\n",
191 client->addr << 1, client->adapter->name);
192
193 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
194 if (state == NULL)
195 return -ENOMEM;
196 sd = &state->sd;
197 v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
198 v4l2_ctrl_handler_init(&state->hdl, 2);
199 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
200 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
201 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
202 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
203 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
204 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
205 sd->ctrl_handler = &state->hdl;
206 if (state->hdl.error) {
207 int err = state->hdl.error;
208
209 v4l2_ctrl_handler_free(&state->hdl);
210 return err;
211 }
212 v4l2_ctrl_cluster(3, &state->volume);
213
214 state->clock_freq = 48000;
215
216 /* Initialize wm8739 */
217
218 /* reset */
219 wm8739_write(sd, R15, 0x00);
220 /* filter setting, high path, offet clear */
221 wm8739_write(sd, R5, 0x000);
222 /* ADC, OSC, Power Off mode Disable */
223 wm8739_write(sd, R6, 0x000);
224 /* Digital Audio interface format:
225 Enable Master mode, 24 bit, MSB first/left justified */
226 wm8739_write(sd, R7, 0x049);
227 /* sampling control: normal, 256fs, 48KHz sampling rate */
228 wm8739_write(sd, R8, 0x000);
229 /* activate */
230 wm8739_write(sd, R9, 0x001);
231 /* set volume/mute */
232 v4l2_ctrl_handler_setup(&state->hdl);
233 return 0;
234 }
235
wm8739_remove(struct i2c_client * client)236 static void wm8739_remove(struct i2c_client *client)
237 {
238 struct v4l2_subdev *sd = i2c_get_clientdata(client);
239 struct wm8739_state *state = to_state(sd);
240
241 v4l2_device_unregister_subdev(sd);
242 v4l2_ctrl_handler_free(&state->hdl);
243 }
244
245 static const struct i2c_device_id wm8739_id[] = {
246 { "wm8739", 0 },
247 { }
248 };
249 MODULE_DEVICE_TABLE(i2c, wm8739_id);
250
251 static struct i2c_driver wm8739_driver = {
252 .driver = {
253 .name = "wm8739",
254 },
255 .probe = wm8739_probe,
256 .remove = wm8739_remove,
257 .id_table = wm8739_id,
258 };
259
260 module_i2c_driver(wm8739_driver);
261