1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for the 1250-EV1 audio I/O module
4 *
5 * Copyright 2011 Wolfson Microelectronics plc
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/i2c.h>
12#include <linux/gpio.h>
13
14#include <sound/soc.h>
15#include <sound/soc-dapm.h>
16#include <sound/wm1250-ev1.h>
17
18static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
19	"WM1250 CLK_ENA",
20	"WM1250 CLK_SEL0",
21	"WM1250 CLK_SEL1",
22	"WM1250 OSR",
23	"WM1250 MASTER",
24};
25
26struct wm1250_priv {
27	struct gpio gpios[WM1250_EV1_NUM_GPIOS];
28};
29
30static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
31				     enum snd_soc_bias_level level)
32{
33	struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
34	int ena;
35
36	if (wm1250)
37		ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
38	else
39		ena = -1;
40
41	switch (level) {
42	case SND_SOC_BIAS_ON:
43		break;
44
45	case SND_SOC_BIAS_PREPARE:
46		break;
47
48	case SND_SOC_BIAS_STANDBY:
49		if (ena >= 0)
50			gpio_set_value_cansleep(ena, 1);
51		break;
52
53	case SND_SOC_BIAS_OFF:
54		if (ena >= 0)
55			gpio_set_value_cansleep(ena, 0);
56		break;
57	}
58
59	return 0;
60}
61
62static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
63SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
64SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
65
66SND_SOC_DAPM_INPUT("WM1250 Input"),
67SND_SOC_DAPM_OUTPUT("WM1250 Output"),
68};
69
70static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
71	{ "ADC", NULL, "WM1250 Input" },
72	{ "WM1250 Output", NULL, "DAC" },
73};
74
75static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
76				struct snd_pcm_hw_params *params,
77				struct snd_soc_dai *dai)
78{
79	struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
80
81	switch (params_rate(params)) {
82	case 8000:
83		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
84			       1);
85		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
86			       1);
87		break;
88	case 16000:
89		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
90			       0);
91		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
92			       1);
93		break;
94	case 32000:
95		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
96			       1);
97		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
98			       0);
99		break;
100	case 64000:
101		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
102			       0);
103		gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
104			       0);
105		break;
106	default:
107		return -EINVAL;
108	}
109
110	return 0;
111}
112
113static const struct snd_soc_dai_ops wm1250_ev1_ops = {
114	.hw_params = wm1250_ev1_hw_params,
115};
116
117#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
118			  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
119
120static struct snd_soc_dai_driver wm1250_ev1_dai = {
121	.name = "wm1250-ev1",
122	.playback = {
123		.stream_name = "Playback",
124		.channels_min = 1,
125		.channels_max = 2,
126		.rates = WM1250_EV1_RATES,
127		.formats = SNDRV_PCM_FMTBIT_S16_LE,
128	},
129	.capture = {
130		.stream_name = "Capture",
131		.channels_min = 1,
132		.channels_max = 2,
133		.rates = WM1250_EV1_RATES,
134		.formats = SNDRV_PCM_FMTBIT_S16_LE,
135	},
136	.ops = &wm1250_ev1_ops,
137};
138
139static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
140	.dapm_widgets		= wm1250_ev1_dapm_widgets,
141	.num_dapm_widgets	= ARRAY_SIZE(wm1250_ev1_dapm_widgets),
142	.dapm_routes		= wm1250_ev1_dapm_routes,
143	.num_dapm_routes	= ARRAY_SIZE(wm1250_ev1_dapm_routes),
144	.set_bias_level		= wm1250_ev1_set_bias_level,
145	.use_pmdown_time	= 1,
146	.endianness		= 1,
147};
148
149static int wm1250_ev1_pdata(struct i2c_client *i2c)
150{
151	struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
152	struct wm1250_priv *wm1250;
153	int i, ret;
154
155	if (!pdata)
156		return 0;
157
158	wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
159	if (!wm1250) {
160		ret = -ENOMEM;
161		goto err;
162	}
163
164	for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
165		wm1250->gpios[i].gpio = pdata->gpios[i];
166		wm1250->gpios[i].label = wm1250_gpio_names[i];
167		wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
168	}
169	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
170	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
171
172	ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
173	if (ret != 0) {
174		dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
175		goto err;
176	}
177
178	dev_set_drvdata(&i2c->dev, wm1250);
179
180	return ret;
181
182err:
183	return ret;
184}
185
186static void wm1250_ev1_free(struct i2c_client *i2c)
187{
188	struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
189
190	if (wm1250)
191		gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
192}
193
194static int wm1250_ev1_probe(struct i2c_client *i2c)
195{
196	int id, board, rev, ret;
197
198	dev_set_drvdata(&i2c->dev, NULL);
199
200	board = i2c_smbus_read_byte_data(i2c, 0);
201	if (board < 0) {
202		dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
203		return board;
204	}
205
206	id = (board & 0xfe) >> 2;
207	rev = board & 0x3;
208
209	if (id != 1) {
210		dev_err(&i2c->dev, "Unknown board ID %d\n", id);
211		return -ENODEV;
212	}
213
214	dev_info(&i2c->dev, "revision %d\n", rev + 1);
215
216	ret = wm1250_ev1_pdata(i2c);
217	if (ret != 0)
218		return ret;
219
220	ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
221				     &wm1250_ev1_dai, 1);
222	if (ret != 0) {
223		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
224		wm1250_ev1_free(i2c);
225		return ret;
226	}
227
228	return 0;
229}
230
231static void wm1250_ev1_remove(struct i2c_client *i2c)
232{
233	wm1250_ev1_free(i2c);
234}
235
236static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
237	{ "wm1250-ev1", 0 },
238	{ }
239};
240MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
241
242static struct i2c_driver wm1250_ev1_i2c_driver = {
243	.driver = {
244		.name = "wm1250-ev1",
245	},
246	.probe =    wm1250_ev1_probe,
247	.remove =   wm1250_ev1_remove,
248	.id_table = wm1250_ev1_i2c_id,
249};
250
251module_i2c_driver(wm1250_ev1_i2c_driver);
252
253MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
254MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
255MODULE_LICENSE("GPL");
256