xref: /openbmc/linux/drivers/media/i2c/wm8739.c (revision 2612e3bbc0386368a850140a6c9b990cd496a5ec)
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