1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (c) 2018-2020, Intel Corporation
3//
4// sof-wm8804.c - ASoC machine driver for Up and Up2 board
5// based on WM8804/Hifiberry Digi+
6
7
8#include <linux/acpi.h>
9#include <linux/dmi.h>
10#include <linux/gpio/consumer.h>
11#include <linux/gpio/machine.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/slab.h>
15#include <sound/pcm.h>
16#include <sound/pcm_params.h>
17#include <sound/soc.h>
18#include <sound/soc-acpi.h>
19#include "../../codecs/wm8804.h"
20
21struct sof_card_private {
22	struct gpio_desc *gpio_44;
23	struct gpio_desc *gpio_48;
24	int sample_rate;
25};
26
27#define SOF_WM8804_UP2_QUIRK			BIT(0)
28
29static unsigned long sof_wm8804_quirk;
30
31static int sof_wm8804_quirk_cb(const struct dmi_system_id *id)
32{
33	sof_wm8804_quirk = (unsigned long)id->driver_data;
34	return 1;
35}
36
37static const struct dmi_system_id sof_wm8804_quirk_table[] = {
38	{
39		.callback = sof_wm8804_quirk_cb,
40		.matches = {
41			DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
42			DMI_MATCH(DMI_PRODUCT_NAME, "UP-APL01"),
43		},
44		.driver_data = (void *)SOF_WM8804_UP2_QUIRK,
45	},
46	{}
47};
48
49static int sof_wm8804_hw_params(struct snd_pcm_substream *substream,
50				struct snd_pcm_hw_params *params)
51{
52	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
53	struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
54	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
55	struct snd_soc_component *codec = codec_dai->component;
56	const int sysclk = 27000000; /* This is fixed on this board */
57	int samplerate;
58	long mclk_freq;
59	int mclk_div;
60	int sampling_freq;
61	bool clk_44;
62	int ret;
63
64	samplerate = params_rate(params);
65	if (samplerate == ctx->sample_rate)
66		return 0;
67
68	ctx->sample_rate = 0;
69
70	if (samplerate <= 96000) {
71		mclk_freq = samplerate * 256;
72		mclk_div = WM8804_MCLKDIV_256FS;
73	} else {
74		mclk_freq = samplerate * 128;
75		mclk_div = WM8804_MCLKDIV_128FS;
76	}
77
78	switch (samplerate) {
79	case 32000:
80		sampling_freq = 0x03;
81		break;
82	case 44100:
83		sampling_freq = 0x00;
84		break;
85	case 48000:
86		sampling_freq = 0x02;
87		break;
88	case 88200:
89		sampling_freq = 0x08;
90		break;
91	case 96000:
92		sampling_freq = 0x0a;
93		break;
94	case 176400:
95		sampling_freq = 0x0c;
96		break;
97	case 192000:
98		sampling_freq = 0x0e;
99		break;
100	default:
101		dev_err(rtd->card->dev,
102			"unsupported samplerate %d\n", samplerate);
103		return -EINVAL;
104	}
105
106	if (samplerate % 16000)
107		clk_44 = true; /* use 44.1 kHz root frequency */
108	else
109		clk_44 = false;
110
111	if (!(IS_ERR_OR_NULL(ctx->gpio_44) ||
112	      IS_ERR_OR_NULL(ctx->gpio_48))) {
113		/*
114		 * ensure both GPIOs are LOW first, then drive the
115		 * relevant one to HIGH
116		 */
117		if (clk_44) {
118			gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
119			gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
120		} else {
121			gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
122			gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
123		}
124	}
125
126	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
127	ret = snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
128	if (ret < 0) {
129		dev_err(rtd->card->dev, "Failed to set WM8804 PLL\n");
130		return ret;
131	}
132
133	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
134				     sysclk, SND_SOC_CLOCK_OUT);
135	if (ret < 0) {
136		dev_err(rtd->card->dev,
137			"Failed to set WM8804 SYSCLK: %d\n", ret);
138		return ret;
139	}
140
141	/* set sampling frequency status bits */
142	snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f,
143				      sampling_freq);
144
145	ctx->sample_rate = samplerate;
146
147	return 0;
148}
149
150/* machine stream operations */
151static struct snd_soc_ops sof_wm8804_ops = {
152	.hw_params = sof_wm8804_hw_params,
153};
154
155SND_SOC_DAILINK_DEF(ssp5_pin,
156	DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin")));
157
158SND_SOC_DAILINK_DEF(ssp5_codec,
159	DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif")));
160
161SND_SOC_DAILINK_DEF(platform,
162	DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0")));
163
164static struct snd_soc_dai_link dailink[] = {
165	/* back ends */
166	{
167		.name = "SSP5-Codec",
168		.id = 0,
169		.no_pcm = 1,
170		.dpcm_playback = 1,
171		.dpcm_capture = 1,
172		.ops = &sof_wm8804_ops,
173		SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform),
174	},
175};
176
177/* SoC card */
178static struct snd_soc_card sof_wm8804_card = {
179	.name = "wm8804", /* sof- prefix added automatically */
180	.owner = THIS_MODULE,
181	.dai_link = dailink,
182	.num_links = ARRAY_SIZE(dailink),
183};
184
185 /* i2c-<HID>:00 with HID being 8 chars */
186static char codec_name[SND_ACPI_I2C_ID_LEN];
187
188/*
189 * to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to
190 * select the clock source. On the Up2 board, this means
191 * Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404.
192 *
193 * Using the ACPI device name is not very nice, but since we only use
194 * the value for the Up2 board there is no risk of conflict with other
195 * platforms.
196 */
197
198static struct gpiod_lookup_table up2_gpios_table = {
199	/* .dev_id is set during probe */
200	.table = {
201		GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH),
202		GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH),
203		{ },
204	},
205};
206
207static int sof_wm8804_probe(struct platform_device *pdev)
208{
209	struct snd_soc_card *card;
210	struct snd_soc_acpi_mach *mach;
211	struct sof_card_private *ctx;
212	struct acpi_device *adev;
213	int dai_index = 0;
214	int ret;
215	int i;
216
217	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
218	if (!ctx)
219		return -ENOMEM;
220
221	mach = pdev->dev.platform_data;
222	card = &sof_wm8804_card;
223	card->dev = &pdev->dev;
224
225	dmi_check_system(sof_wm8804_quirk_table);
226
227	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) {
228		up2_gpios_table.dev_id = dev_name(&pdev->dev);
229		gpiod_add_lookup_table(&up2_gpios_table);
230
231		/*
232		 * The gpios are required for specific boards with
233		 * local oscillators, and optional in other cases.
234		 * Since we can't identify when they are needed, use
235		 * the GPIO as non-optional
236		 */
237
238		ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5",
239					      GPIOD_OUT_LOW);
240		if (IS_ERR(ctx->gpio_44)) {
241			ret = PTR_ERR(ctx->gpio_44);
242			dev_err(&pdev->dev,
243				"could not get BCM-GPIO5: %d\n",
244				ret);
245			return ret;
246		}
247
248		ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6",
249					      GPIOD_OUT_LOW);
250		if (IS_ERR(ctx->gpio_48)) {
251			ret = PTR_ERR(ctx->gpio_48);
252			dev_err(&pdev->dev,
253				"could not get BCM-GPIO6: %d\n",
254				ret);
255			return ret;
256		}
257	}
258
259	/* fix index of codec dai */
260	for (i = 0; i < ARRAY_SIZE(dailink); i++) {
261		if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) {
262			dai_index = i;
263			break;
264		}
265	}
266
267	/* fixup codec name based on HID */
268	adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);
269	if (adev) {
270		snprintf(codec_name, sizeof(codec_name),
271			 "%s%s", "i2c-", acpi_dev_name(adev));
272		dailink[dai_index].codecs->name = codec_name;
273	}
274	acpi_dev_put(adev);
275
276	snd_soc_card_set_drvdata(card, ctx);
277
278	return devm_snd_soc_register_card(&pdev->dev, card);
279}
280
281static void sof_wm8804_remove(struct platform_device *pdev)
282{
283	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK)
284		gpiod_remove_lookup_table(&up2_gpios_table);
285}
286
287static struct platform_driver sof_wm8804_driver = {
288	.driver = {
289		.name = "sof-wm8804",
290		.pm = &snd_soc_pm_ops,
291	},
292	.probe = sof_wm8804_probe,
293	.remove_new = sof_wm8804_remove,
294};
295module_platform_driver(sof_wm8804_driver);
296
297MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver");
298MODULE_AUTHOR("Pierre-Louis Bossart");
299MODULE_LICENSE("GPL v2");
300MODULE_ALIAS("platform:sof-wm8804");
301