1/*
2 * tegra_wm8903.c - Tegra machine ASoC driver for boards using WM8903 codec.
3 *
4 * Author: Stephen Warren <swarren@nvidia.com>
5 * Copyright (C) 2010-2012 - NVIDIA, Inc.
6 *
7 * Based on code copyright/by:
8 *
9 * (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
10 *
11 * Copyright 2007 Wolfson Microelectronics PLC.
12 * Author: Graeme Gregory
13 *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * version 2 as published by the Free Software Foundation.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
27 * 02110-1301 USA
28 *
29 */
30
31#include <linux/module.h>
32#include <linux/platform_device.h>
33#include <linux/slab.h>
34#include <linux/gpio.h>
35#include <linux/of_gpio.h>
36
37#include <sound/core.h>
38#include <sound/jack.h>
39#include <sound/pcm.h>
40#include <sound/pcm_params.h>
41#include <sound/soc.h>
42
43#include "../codecs/wm8903.h"
44
45#include "tegra_asoc_utils.h"
46
47#define DRV_NAME "tegra-snd-wm8903"
48
49struct tegra_wm8903 {
50	int gpio_spkr_en;
51	int gpio_hp_det;
52	int gpio_hp_mute;
53	int gpio_int_mic_en;
54	int gpio_ext_mic_en;
55	struct tegra_asoc_utils_data util_data;
56};
57
58static int tegra_wm8903_hw_params(struct snd_pcm_substream *substream,
59					struct snd_pcm_hw_params *params)
60{
61	struct snd_soc_pcm_runtime *rtd = substream->private_data;
62	struct snd_soc_dai *codec_dai = rtd->codec_dai;
63	struct snd_soc_card *card = rtd->card;
64	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
65	int srate, mclk;
66	int err;
67
68	srate = params_rate(params);
69	switch (srate) {
70	case 64000:
71	case 88200:
72	case 96000:
73		mclk = 128 * srate;
74		break;
75	default:
76		mclk = 256 * srate;
77		break;
78	}
79	/* FIXME: Codec only requires >= 3MHz if OSR==0 */
80	while (mclk < 6000000)
81		mclk *= 2;
82
83	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
84	if (err < 0) {
85		dev_err(card->dev, "Can't configure clocks\n");
86		return err;
87	}
88
89	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
90					SND_SOC_CLOCK_IN);
91	if (err < 0) {
92		dev_err(card->dev, "codec_dai clock not set\n");
93		return err;
94	}
95
96	return 0;
97}
98
99static struct snd_soc_ops tegra_wm8903_ops = {
100	.hw_params = tegra_wm8903_hw_params,
101};
102
103static struct snd_soc_jack tegra_wm8903_hp_jack;
104
105static struct snd_soc_jack_pin tegra_wm8903_hp_jack_pins[] = {
106	{
107		.pin = "Headphone Jack",
108		.mask = SND_JACK_HEADPHONE,
109	},
110};
111
112static struct snd_soc_jack_gpio tegra_wm8903_hp_jack_gpio = {
113	.name = "headphone detect",
114	.report = SND_JACK_HEADPHONE,
115	.debounce_time = 150,
116	.invert = 1,
117};
118
119static struct snd_soc_jack tegra_wm8903_mic_jack;
120
121static struct snd_soc_jack_pin tegra_wm8903_mic_jack_pins[] = {
122	{
123		.pin = "Mic Jack",
124		.mask = SND_JACK_MICROPHONE,
125	},
126};
127
128static int tegra_wm8903_event_int_spk(struct snd_soc_dapm_widget *w,
129					struct snd_kcontrol *k, int event)
130{
131	struct snd_soc_dapm_context *dapm = w->dapm;
132	struct snd_soc_card *card = dapm->card;
133	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
134
135	if (!gpio_is_valid(machine->gpio_spkr_en))
136		return 0;
137
138	gpio_set_value_cansleep(machine->gpio_spkr_en,
139				SND_SOC_DAPM_EVENT_ON(event));
140
141	return 0;
142}
143
144static int tegra_wm8903_event_hp(struct snd_soc_dapm_widget *w,
145					struct snd_kcontrol *k, int event)
146{
147	struct snd_soc_dapm_context *dapm = w->dapm;
148	struct snd_soc_card *card = dapm->card;
149	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
150
151	if (!gpio_is_valid(machine->gpio_hp_mute))
152		return 0;
153
154	gpio_set_value_cansleep(machine->gpio_hp_mute,
155				!SND_SOC_DAPM_EVENT_ON(event));
156
157	return 0;
158}
159
160static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
161	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
162	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
163	SND_SOC_DAPM_MIC("Mic Jack", NULL),
164};
165
166static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
167	SOC_DAPM_PIN_SWITCH("Int Spk"),
168};
169
170static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
171{
172	struct snd_soc_dai *codec_dai = rtd->codec_dai;
173	struct snd_soc_codec *codec = codec_dai->codec;
174	struct snd_soc_card *card = rtd->card;
175	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
176
177	if (gpio_is_valid(machine->gpio_hp_det)) {
178		tegra_wm8903_hp_jack_gpio.gpio = machine->gpio_hp_det;
179		snd_soc_card_jack_new(rtd->card, "Headphone Jack",
180				      SND_JACK_HEADPHONE, &tegra_wm8903_hp_jack,
181				      tegra_wm8903_hp_jack_pins,
182				      ARRAY_SIZE(tegra_wm8903_hp_jack_pins));
183		snd_soc_jack_add_gpios(&tegra_wm8903_hp_jack,
184					1,
185					&tegra_wm8903_hp_jack_gpio);
186	}
187
188	snd_soc_card_jack_new(rtd->card, "Mic Jack", SND_JACK_MICROPHONE,
189			      &tegra_wm8903_mic_jack,
190			      tegra_wm8903_mic_jack_pins,
191			      ARRAY_SIZE(tegra_wm8903_mic_jack_pins));
192	wm8903_mic_detect(codec, &tegra_wm8903_mic_jack, SND_JACK_MICROPHONE,
193				0);
194
195	snd_soc_dapm_force_enable_pin(&card->dapm, "MICBIAS");
196
197	return 0;
198}
199
200static int tegra_wm8903_remove(struct snd_soc_card *card)
201{
202	struct snd_soc_pcm_runtime *rtd = &(card->rtd[0]);
203	struct snd_soc_dai *codec_dai = rtd->codec_dai;
204	struct snd_soc_codec *codec = codec_dai->codec;
205	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
206
207	if (gpio_is_valid(machine->gpio_hp_det)) {
208		snd_soc_jack_free_gpios(&tegra_wm8903_hp_jack, 1,
209					&tegra_wm8903_hp_jack_gpio);
210	}
211
212	wm8903_mic_detect(codec, NULL, 0, 0);
213
214	return 0;
215}
216
217static struct snd_soc_dai_link tegra_wm8903_dai = {
218	.name = "WM8903",
219	.stream_name = "WM8903 PCM",
220	.codec_dai_name = "wm8903-hifi",
221	.init = tegra_wm8903_init,
222	.ops = &tegra_wm8903_ops,
223	.dai_fmt = SND_SOC_DAIFMT_I2S |
224		   SND_SOC_DAIFMT_NB_NF |
225		   SND_SOC_DAIFMT_CBS_CFS,
226};
227
228static struct snd_soc_card snd_soc_tegra_wm8903 = {
229	.name = "tegra-wm8903",
230	.owner = THIS_MODULE,
231	.dai_link = &tegra_wm8903_dai,
232	.num_links = 1,
233	.remove = tegra_wm8903_remove,
234	.controls = tegra_wm8903_controls,
235	.num_controls = ARRAY_SIZE(tegra_wm8903_controls),
236	.dapm_widgets = tegra_wm8903_dapm_widgets,
237	.num_dapm_widgets = ARRAY_SIZE(tegra_wm8903_dapm_widgets),
238	.fully_routed = true,
239};
240
241static int tegra_wm8903_driver_probe(struct platform_device *pdev)
242{
243	struct device_node *np = pdev->dev.of_node;
244	struct snd_soc_card *card = &snd_soc_tegra_wm8903;
245	struct tegra_wm8903 *machine;
246	int ret;
247
248	machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm8903),
249			       GFP_KERNEL);
250	if (!machine) {
251		dev_err(&pdev->dev, "Can't allocate tegra_wm8903 struct\n");
252		return -ENOMEM;
253	}
254
255	card->dev = &pdev->dev;
256	platform_set_drvdata(pdev, card);
257	snd_soc_card_set_drvdata(card, machine);
258
259	machine->gpio_spkr_en = of_get_named_gpio(np, "nvidia,spkr-en-gpios",
260						  0);
261	if (machine->gpio_spkr_en == -EPROBE_DEFER)
262		return -EPROBE_DEFER;
263	if (gpio_is_valid(machine->gpio_spkr_en)) {
264		ret = devm_gpio_request_one(&pdev->dev, machine->gpio_spkr_en,
265					    GPIOF_OUT_INIT_LOW, "spkr_en");
266		if (ret) {
267			dev_err(card->dev, "cannot get spkr_en gpio\n");
268			return ret;
269		}
270	}
271
272	machine->gpio_hp_mute = of_get_named_gpio(np, "nvidia,hp-mute-gpios",
273						  0);
274	if (machine->gpio_hp_mute == -EPROBE_DEFER)
275		return -EPROBE_DEFER;
276	if (gpio_is_valid(machine->gpio_hp_mute)) {
277		ret = devm_gpio_request_one(&pdev->dev, machine->gpio_hp_mute,
278					    GPIOF_OUT_INIT_HIGH, "hp_mute");
279		if (ret) {
280			dev_err(card->dev, "cannot get hp_mute gpio\n");
281			return ret;
282		}
283	}
284
285	machine->gpio_hp_det = of_get_named_gpio(np, "nvidia,hp-det-gpios", 0);
286	if (machine->gpio_hp_det == -EPROBE_DEFER)
287		return -EPROBE_DEFER;
288
289	machine->gpio_int_mic_en = of_get_named_gpio(np,
290						"nvidia,int-mic-en-gpios", 0);
291	if (machine->gpio_int_mic_en == -EPROBE_DEFER)
292		return -EPROBE_DEFER;
293	if (gpio_is_valid(machine->gpio_int_mic_en)) {
294		/* Disable int mic; enable signal is active-high */
295		ret = devm_gpio_request_one(&pdev->dev,
296					    machine->gpio_int_mic_en,
297					    GPIOF_OUT_INIT_LOW, "int_mic_en");
298		if (ret) {
299			dev_err(card->dev, "cannot get int_mic_en gpio\n");
300			return ret;
301		}
302	}
303
304	machine->gpio_ext_mic_en = of_get_named_gpio(np,
305						"nvidia,ext-mic-en-gpios", 0);
306	if (machine->gpio_ext_mic_en == -EPROBE_DEFER)
307		return -EPROBE_DEFER;
308	if (gpio_is_valid(machine->gpio_ext_mic_en)) {
309		/* Enable ext mic; enable signal is active-low */
310		ret = devm_gpio_request_one(&pdev->dev,
311					    machine->gpio_ext_mic_en,
312					    GPIOF_OUT_INIT_LOW, "ext_mic_en");
313		if (ret) {
314			dev_err(card->dev, "cannot get ext_mic_en gpio\n");
315			return ret;
316		}
317	}
318
319	ret = snd_soc_of_parse_card_name(card, "nvidia,model");
320	if (ret)
321		goto err;
322
323	ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
324	if (ret)
325		goto err;
326
327	tegra_wm8903_dai.codec_of_node = of_parse_phandle(np,
328						"nvidia,audio-codec", 0);
329	if (!tegra_wm8903_dai.codec_of_node) {
330		dev_err(&pdev->dev,
331			"Property 'nvidia,audio-codec' missing or invalid\n");
332		ret = -EINVAL;
333		goto err;
334	}
335
336	tegra_wm8903_dai.cpu_of_node = of_parse_phandle(np,
337			"nvidia,i2s-controller", 0);
338	if (!tegra_wm8903_dai.cpu_of_node) {
339		dev_err(&pdev->dev,
340			"Property 'nvidia,i2s-controller' missing or invalid\n");
341		ret = -EINVAL;
342		goto err;
343	}
344
345	tegra_wm8903_dai.platform_of_node = tegra_wm8903_dai.cpu_of_node;
346
347	ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
348	if (ret)
349		goto err;
350
351	ret = snd_soc_register_card(card);
352	if (ret) {
353		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
354			ret);
355		goto err_fini_utils;
356	}
357
358	return 0;
359
360err_fini_utils:
361	tegra_asoc_utils_fini(&machine->util_data);
362err:
363	return ret;
364}
365
366static int tegra_wm8903_driver_remove(struct platform_device *pdev)
367{
368	struct snd_soc_card *card = platform_get_drvdata(pdev);
369	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
370
371	snd_soc_unregister_card(card);
372
373	tegra_asoc_utils_fini(&machine->util_data);
374
375	return 0;
376}
377
378static const struct of_device_id tegra_wm8903_of_match[] = {
379	{ .compatible = "nvidia,tegra-audio-wm8903", },
380	{},
381};
382
383static struct platform_driver tegra_wm8903_driver = {
384	.driver = {
385		.name = DRV_NAME,
386		.pm = &snd_soc_pm_ops,
387		.of_match_table = tegra_wm8903_of_match,
388	},
389	.probe = tegra_wm8903_driver_probe,
390	.remove = tegra_wm8903_driver_remove,
391};
392module_platform_driver(tegra_wm8903_driver);
393
394MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
395MODULE_DESCRIPTION("Tegra+WM8903 machine ASoC driver");
396MODULE_LICENSE("GPL");
397MODULE_ALIAS("platform:" DRV_NAME);
398MODULE_DEVICE_TABLE(of, tegra_wm8903_of_match);
399