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 | |
52 | static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) |
53 | { |
54 | return container_of(sd, struct wm8739_state, sd); |
55 | } |
56 | |
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 | |
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 | 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 | |
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, 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 | |
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, 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 | |
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(hdl: &state->hdl, prefix: 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 | |
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(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 | |
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(hdl: &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 | |