1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Analog Devices ADV7511 HDMI transmitter driver
  4 *
  5 * Copyright 2012 Analog Devices Inc.
  6 * Copyright (c) 2016, Linaro Limited
  7 */
  8
  9#include <sound/core.h>
 10#include <sound/hdmi-codec.h>
 11#include <sound/pcm.h>
 12#include <sound/soc.h>
 13#include <linux/of_graph.h>
 14
 15#include "adv7511.h"
 16
 17static void adv7511_calc_cts_n(unsigned int f_tmds, unsigned int fs,
 18			       unsigned int *cts, unsigned int *n)
 19{
 20	switch (fs) {
 21	case 32000:
 22	case 48000:
 23	case 96000:
 24	case 192000:
 25		*n = fs * 128 / 1000;
 26		break;
 27	case 44100:
 28	case 88200:
 29	case 176400:
 30		*n = fs * 128 / 900;
 31		break;
 32	}
 33
 34	*cts = ((f_tmds * *n) / (128 * fs)) * 1000;
 35}
 36
 37static int adv7511_update_cts_n(struct adv7511 *adv7511)
 38{
 39	unsigned int cts = 0;
 40	unsigned int n = 0;
 41
 42	adv7511_calc_cts_n(adv7511->f_tmds, adv7511->f_audio, &cts, &n);
 43
 44	regmap_write(adv7511->regmap, ADV7511_REG_N0, (n >> 16) & 0xf);
 45	regmap_write(adv7511->regmap, ADV7511_REG_N1, (n >> 8) & 0xff);
 46	regmap_write(adv7511->regmap, ADV7511_REG_N2, n & 0xff);
 47
 48	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL0,
 49		     (cts >> 16) & 0xf);
 50	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL1,
 51		     (cts >> 8) & 0xff);
 52	regmap_write(adv7511->regmap, ADV7511_REG_CTS_MANUAL2,
 53		     cts & 0xff);
 54
 55	return 0;
 56}
 57
 58int adv7511_hdmi_hw_params(struct device *dev, void *data,
 59			   struct hdmi_codec_daifmt *fmt,
 60			   struct hdmi_codec_params *hparms)
 61{
 62	struct adv7511 *adv7511 = dev_get_drvdata(dev);
 63	unsigned int audio_source, i2s_format = 0;
 64	unsigned int invert_clock;
 65	unsigned int rate;
 66	unsigned int len;
 67
 68	switch (hparms->sample_rate) {
 69	case 32000:
 70		rate = ADV7511_SAMPLE_FREQ_32000;
 71		break;
 72	case 44100:
 73		rate = ADV7511_SAMPLE_FREQ_44100;
 74		break;
 75	case 48000:
 76		rate = ADV7511_SAMPLE_FREQ_48000;
 77		break;
 78	case 88200:
 79		rate = ADV7511_SAMPLE_FREQ_88200;
 80		break;
 81	case 96000:
 82		rate = ADV7511_SAMPLE_FREQ_96000;
 83		break;
 84	case 176400:
 85		rate = ADV7511_SAMPLE_FREQ_176400;
 86		break;
 87	case 192000:
 88		rate = ADV7511_SAMPLE_FREQ_192000;
 89		break;
 90	default:
 91		return -EINVAL;
 92	}
 93
 94	switch (hparms->sample_width) {
 95	case 16:
 96		len = ADV7511_I2S_SAMPLE_LEN_16;
 97		break;
 98	case 18:
 99		len = ADV7511_I2S_SAMPLE_LEN_18;
100		break;
101	case 20:
102		len = ADV7511_I2S_SAMPLE_LEN_20;
103		break;
104	case 24:
105		len = ADV7511_I2S_SAMPLE_LEN_24;
106		break;
107	default:
108		return -EINVAL;
109	}
110
111	switch (fmt->fmt) {
112	case HDMI_I2S:
113		audio_source = ADV7511_AUDIO_SOURCE_I2S;
114		i2s_format = ADV7511_I2S_FORMAT_I2S;
115		break;
116	case HDMI_RIGHT_J:
117		audio_source = ADV7511_AUDIO_SOURCE_I2S;
118		i2s_format = ADV7511_I2S_FORMAT_RIGHT_J;
119		break;
120	case HDMI_LEFT_J:
121		audio_source = ADV7511_AUDIO_SOURCE_I2S;
122		i2s_format = ADV7511_I2S_FORMAT_LEFT_J;
123		break;
124	case HDMI_SPDIF:
125		audio_source = ADV7511_AUDIO_SOURCE_SPDIF;
126		break;
127	default:
128		return -EINVAL;
129	}
130
131	invert_clock = fmt->bit_clk_inv;
132
133	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_SOURCE, 0x70,
134			   audio_source << 4);
135	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG, BIT(6),
136			   invert_clock << 6);
137	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2S_CONFIG, 0x03,
138			   i2s_format);
139
140	adv7511->audio_source = audio_source;
141
142	adv7511->f_audio = hparms->sample_rate;
143
144	adv7511_update_cts_n(adv7511);
145
146	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG3,
147			   ADV7511_AUDIO_CFG3_LEN_MASK, len);
148	regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG,
149			   ADV7511_I2C_FREQ_ID_CFG_RATE_MASK, rate << 4);
150	regmap_write(adv7511->regmap, 0x73, 0x1);
151
152	return 0;
153}
154
155static int audio_startup(struct device *dev, void *data)
156{
157	struct adv7511 *adv7511 = dev_get_drvdata(dev);
158
159	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
160				BIT(7), 0);
161
162	/* hide Audio infoframe updates */
163	regmap_update_bits(adv7511->regmap, ADV7511_REG_INFOFRAME_UPDATE,
164				BIT(5), BIT(5));
165	/* enable N/CTS, enable Audio sample packets */
166	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
167				BIT(5), BIT(5));
168	/* enable N/CTS */
169	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
170				BIT(6), BIT(6));
171	/* not copyrighted */
172	regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CFG1,
173				BIT(5), BIT(5));
174	/* enable audio infoframes */
175	regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
176				BIT(3), BIT(3));
177	/* AV mute disable */
178	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(0),
179				BIT(7) | BIT(6), BIT(7));
180	/* use Audio infoframe updated info */
181	regmap_update_bits(adv7511->regmap, ADV7511_REG_GC(1),
182				BIT(5), 0);
183	/* enable SPDIF receiver */
184	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
185		regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
186				   BIT(7), BIT(7));
187
188	return 0;
189}
190
191static void audio_shutdown(struct device *dev, void *data)
192{
193	struct adv7511 *adv7511 = dev_get_drvdata(dev);
194
195	if (adv7511->audio_source == ADV7511_AUDIO_SOURCE_SPDIF)
196		regmap_update_bits(adv7511->regmap, ADV7511_REG_AUDIO_CONFIG,
197				   BIT(7), 0);
198}
199
200static int adv7511_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
201					struct device_node *endpoint)
202{
203	struct of_endpoint of_ep;
204	int ret;
205
206	ret = of_graph_parse_endpoint(endpoint, &of_ep);
207	if (ret < 0)
208		return ret;
209
210	/*
211	 * HDMI sound should be located as reg = <2>
212	 * Then, it is sound port 0
213	 */
214	if (of_ep.port == 2)
215		return 0;
216
217	return -EINVAL;
218}
219
220static const struct hdmi_codec_ops adv7511_codec_ops = {
221	.hw_params	= adv7511_hdmi_hw_params,
222	.audio_shutdown = audio_shutdown,
223	.audio_startup	= audio_startup,
224	.get_dai_id	= adv7511_hdmi_i2s_get_dai_id,
225};
226
227static const struct hdmi_codec_pdata codec_data = {
228	.ops = &adv7511_codec_ops,
229	.max_i2s_channels = 2,
230	.i2s = 1,
231	.spdif = 1,
232};
233
234int adv7511_audio_init(struct device *dev, struct adv7511 *adv7511)
235{
236	adv7511->audio_pdev = platform_device_register_data(dev,
237					HDMI_CODEC_DRV_NAME,
238					PLATFORM_DEVID_AUTO,
239					&codec_data,
240					sizeof(codec_data));
241	return PTR_ERR_OR_ZERO(adv7511->audio_pdev);
242}
243
244void adv7511_audio_exit(struct adv7511 *adv7511)
245{
246	if (adv7511->audio_pdev) {
247		platform_device_unregister(adv7511->audio_pdev);
248		adv7511->audio_pdev = NULL;
249	}
250}