1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * omap3pandora.c  --  SoC audio for Pandora Handheld Console
4  *
5  * Author: Gražvydas Ignotas <notasas@gmail.com>
6  */
7 
8 #include <linux/clk.h>
9 #include <linux/platform_device.h>
10 #include <linux/gpio.h>
11 #include <linux/delay.h>
12 #include <linux/regulator/consumer.h>
13 #include <linux/module.h>
14 
15 #include <sound/core.h>
16 #include <sound/pcm.h>
17 #include <sound/soc.h>
18 
19 #include <asm/mach-types.h>
20 #include <linux/platform_data/asoc-ti-mcbsp.h>
21 
22 #include "omap-mcbsp.h"
23 
24 #define OMAP3_PANDORA_DAC_POWER_GPIO	118
25 #define OMAP3_PANDORA_AMP_POWER_GPIO	14
26 
27 #define PREFIX "ASoC omap3pandora: "
28 
29 static struct regulator *omap3pandora_dac_reg;
30 
omap3pandora_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)31 static int omap3pandora_hw_params(struct snd_pcm_substream *substream,
32 	struct snd_pcm_hw_params *params)
33 {
34 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
35 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
36 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
37 	int ret;
38 
39 	/* Set the codec system clock for DAC and ADC */
40 	ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
41 					    SND_SOC_CLOCK_IN);
42 	if (ret < 0) {
43 		pr_err(PREFIX "can't set codec system clock\n");
44 		return ret;
45 	}
46 
47 	/* Set McBSP clock to external */
48 	ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT,
49 				     256 * params_rate(params),
50 				     SND_SOC_CLOCK_IN);
51 	if (ret < 0) {
52 		pr_err(PREFIX "can't set cpu system clock\n");
53 		return ret;
54 	}
55 
56 	ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 8);
57 	if (ret < 0) {
58 		pr_err(PREFIX "can't set SRG clock divider\n");
59 		return ret;
60 	}
61 
62 	return 0;
63 }
64 
omap3pandora_dac_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * k,int event)65 static int omap3pandora_dac_event(struct snd_soc_dapm_widget *w,
66 	struct snd_kcontrol *k, int event)
67 {
68 	int ret;
69 
70 	/*
71 	 * The PCM1773 DAC datasheet requires 1ms delay between switching
72 	 * VCC power on/off and /PD pin high/low
73 	 */
74 	if (SND_SOC_DAPM_EVENT_ON(event)) {
75 		ret = regulator_enable(omap3pandora_dac_reg);
76 		if (ret) {
77 			dev_err(w->dapm->dev, "Failed to power DAC: %d\n", ret);
78 			return ret;
79 		}
80 		mdelay(1);
81 		gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 1);
82 	} else {
83 		gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
84 		mdelay(1);
85 		regulator_disable(omap3pandora_dac_reg);
86 	}
87 
88 	return 0;
89 }
90 
omap3pandora_hp_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * k,int event)91 static int omap3pandora_hp_event(struct snd_soc_dapm_widget *w,
92 	struct snd_kcontrol *k, int event)
93 {
94 	if (SND_SOC_DAPM_EVENT_ON(event))
95 		gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 1);
96 	else
97 		gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 0);
98 
99 	return 0;
100 }
101 
102 /*
103  * Audio paths on Pandora board:
104  *
105  *  |O| ---> PCM DAC +-> AMP -> Headphone Jack
106  *  |M|         A    +--------> Line Out
107  *  |A| <~~clk~~+
108  *  |P| <--- TWL4030 <--------- Line In and MICs
109  */
110 static const struct snd_soc_dapm_widget omap3pandora_dapm_widgets[] = {
111 	SND_SOC_DAPM_DAC_E("PCM DAC", "HiFi Playback", SND_SOC_NOPM,
112 			   0, 0, omap3pandora_dac_event,
113 			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
114 	SND_SOC_DAPM_PGA_E("Headphone Amplifier", SND_SOC_NOPM,
115 			   0, 0, NULL, 0, omap3pandora_hp_event,
116 			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
117 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
118 	SND_SOC_DAPM_LINE("Line Out", NULL),
119 
120 	SND_SOC_DAPM_MIC("Mic (internal)", NULL),
121 	SND_SOC_DAPM_MIC("Mic (external)", NULL),
122 	SND_SOC_DAPM_LINE("Line In", NULL),
123 };
124 
125 static const struct snd_soc_dapm_route omap3pandora_map[] = {
126 	{"PCM DAC", NULL, "APLL Enable"},
127 	{"Headphone Amplifier", NULL, "PCM DAC"},
128 	{"Line Out", NULL, "PCM DAC"},
129 	{"Headphone Jack", NULL, "Headphone Amplifier"},
130 
131 	{"AUXL", NULL, "Line In"},
132 	{"AUXR", NULL, "Line In"},
133 
134 	{"MAINMIC", NULL, "Mic (internal)"},
135 	{"Mic (internal)", NULL, "Mic Bias 1"},
136 
137 	{"SUBMIC", NULL, "Mic (external)"},
138 	{"Mic (external)", NULL, "Mic Bias 2"},
139 };
140 
omap3pandora_out_init(struct snd_soc_pcm_runtime * rtd)141 static int omap3pandora_out_init(struct snd_soc_pcm_runtime *rtd)
142 {
143 	struct snd_soc_dapm_context *dapm = &rtd->card->dapm;
144 
145 	/* All TWL4030 output pins are floating */
146 	snd_soc_dapm_nc_pin(dapm, "EARPIECE");
147 	snd_soc_dapm_nc_pin(dapm, "PREDRIVEL");
148 	snd_soc_dapm_nc_pin(dapm, "PREDRIVER");
149 	snd_soc_dapm_nc_pin(dapm, "HSOL");
150 	snd_soc_dapm_nc_pin(dapm, "HSOR");
151 	snd_soc_dapm_nc_pin(dapm, "CARKITL");
152 	snd_soc_dapm_nc_pin(dapm, "CARKITR");
153 	snd_soc_dapm_nc_pin(dapm, "HFL");
154 	snd_soc_dapm_nc_pin(dapm, "HFR");
155 	snd_soc_dapm_nc_pin(dapm, "VIBRA");
156 
157 	return 0;
158 }
159 
omap3pandora_in_init(struct snd_soc_pcm_runtime * rtd)160 static int omap3pandora_in_init(struct snd_soc_pcm_runtime *rtd)
161 {
162 	struct snd_soc_dapm_context *dapm = &rtd->card->dapm;
163 
164 	/* Not comnnected */
165 	snd_soc_dapm_nc_pin(dapm, "HSMIC");
166 	snd_soc_dapm_nc_pin(dapm, "CARKITMIC");
167 	snd_soc_dapm_nc_pin(dapm, "DIGIMIC0");
168 	snd_soc_dapm_nc_pin(dapm, "DIGIMIC1");
169 
170 	return 0;
171 }
172 
173 static const struct snd_soc_ops omap3pandora_ops = {
174 	.hw_params = omap3pandora_hw_params,
175 };
176 
177 /* Digital audio interface glue - connects codec <--> CPU */
178 SND_SOC_DAILINK_DEFS(out,
179 	DAILINK_COMP_ARRAY(COMP_CPU("omap-mcbsp.2")),
180 	DAILINK_COMP_ARRAY(COMP_CODEC("twl4030-codec", "twl4030-hifi")),
181 	DAILINK_COMP_ARRAY(COMP_PLATFORM("omap-mcbsp.2")));
182 
183 SND_SOC_DAILINK_DEFS(in,
184 	DAILINK_COMP_ARRAY(COMP_CPU("omap-mcbsp.4")),
185 	DAILINK_COMP_ARRAY(COMP_CODEC("twl4030-codec", "twl4030-hifi")),
186 	DAILINK_COMP_ARRAY(COMP_PLATFORM("omap-mcbsp.4")));
187 
188 static struct snd_soc_dai_link omap3pandora_dai[] = {
189 	{
190 		.name = "PCM1773",
191 		.stream_name = "HiFi Out",
192 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
193 			   SND_SOC_DAIFMT_CBS_CFS,
194 		.ops = &omap3pandora_ops,
195 		.init = omap3pandora_out_init,
196 		SND_SOC_DAILINK_REG(out),
197 	}, {
198 		.name = "TWL4030",
199 		.stream_name = "Line/Mic In",
200 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
201 			   SND_SOC_DAIFMT_CBS_CFS,
202 		.ops = &omap3pandora_ops,
203 		.init = omap3pandora_in_init,
204 		SND_SOC_DAILINK_REG(in),
205 	}
206 };
207 
208 /* SoC card */
209 static struct snd_soc_card snd_soc_card_omap3pandora = {
210 	.name = "omap3pandora",
211 	.owner = THIS_MODULE,
212 	.dai_link = omap3pandora_dai,
213 	.num_links = ARRAY_SIZE(omap3pandora_dai),
214 
215 	.dapm_widgets = omap3pandora_dapm_widgets,
216 	.num_dapm_widgets = ARRAY_SIZE(omap3pandora_dapm_widgets),
217 	.dapm_routes = omap3pandora_map,
218 	.num_dapm_routes = ARRAY_SIZE(omap3pandora_map),
219 };
220 
221 static struct platform_device *omap3pandora_snd_device;
222 
omap3pandora_soc_init(void)223 static int __init omap3pandora_soc_init(void)
224 {
225 	int ret;
226 
227 	if (!machine_is_omap3_pandora())
228 		return -ENODEV;
229 
230 	pr_info("OMAP3 Pandora SoC init\n");
231 
232 	ret = gpio_request(OMAP3_PANDORA_DAC_POWER_GPIO, "dac_power");
233 	if (ret) {
234 		pr_err(PREFIX "Failed to get DAC power GPIO\n");
235 		return ret;
236 	}
237 
238 	ret = gpio_direction_output(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
239 	if (ret) {
240 		pr_err(PREFIX "Failed to set DAC power GPIO direction\n");
241 		goto fail0;
242 	}
243 
244 	ret = gpio_request(OMAP3_PANDORA_AMP_POWER_GPIO, "amp_power");
245 	if (ret) {
246 		pr_err(PREFIX "Failed to get amp power GPIO\n");
247 		goto fail0;
248 	}
249 
250 	ret = gpio_direction_output(OMAP3_PANDORA_AMP_POWER_GPIO, 0);
251 	if (ret) {
252 		pr_err(PREFIX "Failed to set amp power GPIO direction\n");
253 		goto fail1;
254 	}
255 
256 	omap3pandora_snd_device = platform_device_alloc("soc-audio", -1);
257 	if (omap3pandora_snd_device == NULL) {
258 		pr_err(PREFIX "Platform device allocation failed\n");
259 		ret = -ENOMEM;
260 		goto fail1;
261 	}
262 
263 	platform_set_drvdata(omap3pandora_snd_device, &snd_soc_card_omap3pandora);
264 
265 	ret = platform_device_add(omap3pandora_snd_device);
266 	if (ret) {
267 		pr_err(PREFIX "Unable to add platform device\n");
268 		goto fail2;
269 	}
270 
271 	omap3pandora_dac_reg = regulator_get(&omap3pandora_snd_device->dev, "vcc");
272 	if (IS_ERR(omap3pandora_dac_reg)) {
273 		pr_err(PREFIX "Failed to get DAC regulator from %s: %ld\n",
274 			dev_name(&omap3pandora_snd_device->dev),
275 			PTR_ERR(omap3pandora_dac_reg));
276 		ret = PTR_ERR(omap3pandora_dac_reg);
277 		goto fail3;
278 	}
279 
280 	return 0;
281 
282 fail3:
283 	platform_device_del(omap3pandora_snd_device);
284 fail2:
285 	platform_device_put(omap3pandora_snd_device);
286 fail1:
287 	gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
288 fail0:
289 	gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
290 	return ret;
291 }
292 module_init(omap3pandora_soc_init);
293 
omap3pandora_soc_exit(void)294 static void __exit omap3pandora_soc_exit(void)
295 {
296 	regulator_put(omap3pandora_dac_reg);
297 	platform_device_unregister(omap3pandora_snd_device);
298 	gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
299 	gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
300 }
301 module_exit(omap3pandora_soc_exit);
302 
303 MODULE_AUTHOR("Grazvydas Ignotas <notasas@gmail.com>");
304 MODULE_DESCRIPTION("ALSA SoC OMAP3 Pandora");
305 MODULE_LICENSE("GPL");
306