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
21MODULE_DESCRIPTION("wm8739 driver");
22MODULE_AUTHOR("T. Adachi, Hans Verkuil");
23MODULE_LICENSE("GPL");
24
25static int debug;
26
27module_param(debug, int, 0644);
28
29MODULE_PARM_DESC(debug, "Debug level (0-1)");
30
31
32/* ------------------------------------------------------------------------ */
33
34enum {
35 R0 = 0, R1,
36 R5 = 5, R6, R7, R8, R9, R15 = 15,
37 TOT_REGS
38};
39
40struct 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
52static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
53{
54 return container_of(sd, struct wm8739_state, sd);
55}
56
57static 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
64static 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 command: (reg << 1) | (val >> 8), value: 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
84static 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, reg: R0, val: (vol_l & 0x1f) | mute);
115 wm8739_write(sd, reg: R1, val: (vol_r & 0x1f) | mute);
116 return 0;
117}
118
119/* ------------------------------------------------------------------------ */
120
121static 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, reg: R9, val: 0x000);
128 switch (audiofreq) {
129 case 44100:
130 /* 256fps, fs=44.1k */
131 wm8739_write(sd, reg: R8, val: 0x020);
132 break;
133 case 48000:
134 /* 256fps, fs=48k */
135 wm8739_write(sd, reg: R8, val: 0x000);
136 break;
137 case 32000:
138 /* 256fps, fs=32k */
139 wm8739_write(sd, reg: R8, val: 0x018);
140 break;
141 default:
142 break;
143 }
144 /* activate */
145 wm8739_write(sd, reg: R9, val: 0x001);
146 return 0;
147}
148
149static 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(hdl: &state->hdl, prefix: sd->name);
155 return 0;
156}
157
158/* ----------------------------------------------------------------------- */
159
160static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
161 .s_ctrl = wm8739_s_ctrl,
162};
163
164static const struct v4l2_subdev_core_ops wm8739_core_ops = {
165 .log_status = wm8739_log_status,
166};
167
168static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
169 .s_clock_freq = wm8739_s_clock_freq,
170};
171
172static 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
181static 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(adap: 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(dev: &client->dev, size: sizeof(*state), GFP_KERNEL);
194 if (state == NULL)
195 return -ENOMEM;
196 sd = &state->sd;
197 v4l2_i2c_subdev_init(sd, client, ops: &wm8739_ops);
198 v4l2_ctrl_handler_init(&state->hdl, 2);
199 state->volume = v4l2_ctrl_new_std(hdl: &state->hdl, ops: &wm8739_ctrl_ops,
200 V4L2_CID_AUDIO_VOLUME, min: 0, max: 65535, step: 65535 / 100, def: 50736);
201 state->mute = v4l2_ctrl_new_std(hdl: &state->hdl, ops: &wm8739_ctrl_ops,
202 V4L2_CID_AUDIO_MUTE, min: 0, max: 1, step: 1, def: 0);
203 state->balance = v4l2_ctrl_new_std(hdl: &state->hdl, ops: &wm8739_ctrl_ops,
204 V4L2_CID_AUDIO_BALANCE, min: 0, max: 65535, step: 65535 / 100, def: 32768);
205 sd->ctrl_handler = &state->hdl;
206 if (state->hdl.error) {
207 int err = state->hdl.error;
208
209 v4l2_ctrl_handler_free(hdl: &state->hdl);
210 return err;
211 }
212 v4l2_ctrl_cluster(ncontrols: 3, controls: &state->volume);
213
214 state->clock_freq = 48000;
215
216 /* Initialize wm8739 */
217
218 /* reset */
219 wm8739_write(sd, reg: R15, val: 0x00);
220 /* filter setting, high path, offet clear */
221 wm8739_write(sd, reg: R5, val: 0x000);
222 /* ADC, OSC, Power Off mode Disable */
223 wm8739_write(sd, reg: R6, val: 0x000);
224 /* Digital Audio interface format:
225 Enable Master mode, 24 bit, MSB first/left justified */
226 wm8739_write(sd, reg: R7, val: 0x049);
227 /* sampling control: normal, 256fs, 48KHz sampling rate */
228 wm8739_write(sd, reg: R8, val: 0x000);
229 /* activate */
230 wm8739_write(sd, reg: R9, val: 0x001);
231 /* set volume/mute */
232 v4l2_ctrl_handler_setup(hdl: &state->hdl);
233 return 0;
234}
235
236static 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(hdl: &state->hdl);
243}
244
245static const struct i2c_device_id wm8739_id[] = {
246 { "wm8739", 0 },
247 { }
248};
249MODULE_DEVICE_TABLE(i2c, wm8739_id);
250
251static 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
260module_i2c_driver(wm8739_driver);
261

source code of linux/drivers/media/i2c/wm8739.c