wm8739.c

  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@kernel.org>
  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				(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
 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, R0, (vol_l & 0x1f) | mute);
115	wm8739_write(sd, R1, (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, 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
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(&state->hdl, 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(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
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(&state->hdl);
243}
244
245static const struct i2c_device_id wm8739_id[] = {
246	{ "wm8739" },
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);