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/consumer.h>
13
14#include <sound/soc.h>
15#include <sound/soc-dapm.h>
16
17struct wm1250_priv {
18	struct gpio_desc *clk_ena;
19	struct gpio_desc *clk_sel0;
20	struct gpio_desc *clk_sel1;
21	struct gpio_desc *osr;
22	struct gpio_desc *master;
23};
24
25static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
26				     enum snd_soc_bias_level level)
27{
28	struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
29
30	switch (level) {
31	case SND_SOC_BIAS_ON:
32		break;
33
34	case SND_SOC_BIAS_PREPARE:
35		break;
36
37	case SND_SOC_BIAS_STANDBY:
38		gpiod_set_value_cansleep(wm1250->clk_ena, 1);
39		break;
40
41	case SND_SOC_BIAS_OFF:
42		gpiod_set_value_cansleep(wm1250->clk_ena, 0);
43		break;
44	}
45
46	return 0;
47}
48
49static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
50SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
51SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
52
53SND_SOC_DAPM_INPUT("WM1250 Input"),
54SND_SOC_DAPM_OUTPUT("WM1250 Output"),
55};
56
57static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
58	{ "ADC", NULL, "WM1250 Input" },
59	{ "WM1250 Output", NULL, "DAC" },
60};
61
62static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
63				struct snd_pcm_hw_params *params,
64				struct snd_soc_dai *dai)
65{
66	struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
67
68	switch (params_rate(params)) {
69	case 8000:
70		gpiod_set_value(wm1250->clk_sel0, 1);
71		gpiod_set_value(wm1250->clk_sel1, 1);
72		break;
73	case 16000:
74		gpiod_set_value(wm1250->clk_sel0, 0);
75		gpiod_set_value(wm1250->clk_sel1, 1);
76		break;
77	case 32000:
78		gpiod_set_value(wm1250->clk_sel0, 1);
79		gpiod_set_value(wm1250->clk_sel1, 0);
80		break;
81	case 64000:
82		gpiod_set_value(wm1250->clk_sel0, 0);
83		gpiod_set_value(wm1250->clk_sel1, 0);
84		break;
85	default:
86		return -EINVAL;
87	}
88
89	return 0;
90}
91
92static const struct snd_soc_dai_ops wm1250_ev1_ops = {
93	.hw_params = wm1250_ev1_hw_params,
94};
95
96#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
97			  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
98
99static struct snd_soc_dai_driver wm1250_ev1_dai = {
100	.name = "wm1250-ev1",
101	.playback = {
102		.stream_name = "Playback",
103		.channels_min = 1,
104		.channels_max = 2,
105		.rates = WM1250_EV1_RATES,
106		.formats = SNDRV_PCM_FMTBIT_S16_LE,
107	},
108	.capture = {
109		.stream_name = "Capture",
110		.channels_min = 1,
111		.channels_max = 2,
112		.rates = WM1250_EV1_RATES,
113		.formats = SNDRV_PCM_FMTBIT_S16_LE,
114	},
115	.ops = &wm1250_ev1_ops,
116};
117
118static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
119	.dapm_widgets		= wm1250_ev1_dapm_widgets,
120	.num_dapm_widgets	= ARRAY_SIZE(wm1250_ev1_dapm_widgets),
121	.dapm_routes		= wm1250_ev1_dapm_routes,
122	.num_dapm_routes	= ARRAY_SIZE(wm1250_ev1_dapm_routes),
123	.set_bias_level		= wm1250_ev1_set_bias_level,
124	.use_pmdown_time	= 1,
125	.endianness		= 1,
126};
127
128static int wm1250_ev1_pdata(struct i2c_client *i2c)
129{
130	struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
131	struct wm1250_priv *wm1250;
132
133	if (!pdata)
134		return 0;
135
136	wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
137	if (!wm1250)
138		return -ENOMEM;
139
140	wm1250->clk_ena = devm_gpiod_get(&i2c->dev, "clk-ena", GPIOD_OUT_LOW);
141	if (IS_ERR(wm1250->clk_ena))
142		return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_ena),
143				     "failed to get clock enable GPIO\n");
144
145	wm1250->clk_sel0 = devm_gpiod_get(&i2c->dev, "clk-sel0", GPIOD_OUT_HIGH);
146	if (IS_ERR(wm1250->clk_sel0))
147		return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel0),
148				     "failed to get clock sel0 GPIO\n");
149
150	wm1250->clk_sel1 = devm_gpiod_get(&i2c->dev, "clk-sel1", GPIOD_OUT_HIGH);
151	if (IS_ERR(wm1250->clk_sel1))
152		return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel1),
153				     "failed to get clock sel1 GPIO\n");
154
155	wm1250->osr = devm_gpiod_get(&i2c->dev, "osr", GPIOD_OUT_LOW);
156	if (IS_ERR(wm1250->osr))
157		return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->osr),
158				     "failed to get OSR GPIO\n");
159
160	wm1250->master = devm_gpiod_get(&i2c->dev, "master", GPIOD_OUT_LOW);
161	if (IS_ERR(wm1250->master))
162		return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->master),
163				     "failed to get MASTER GPIO\n");
164
165	dev_set_drvdata(&i2c->dev, wm1250);
166
167	return 0;
168}
169
170static int wm1250_ev1_probe(struct i2c_client *i2c)
171{
172	int id, board, rev, ret;
173
174	dev_set_drvdata(&i2c->dev, NULL);
175
176	board = i2c_smbus_read_byte_data(i2c, 0);
177	if (board < 0) {
178		dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
179		return board;
180	}
181
182	id = (board & 0xfe) >> 2;
183	rev = board & 0x3;
184
185	if (id != 1) {
186		dev_err(&i2c->dev, "Unknown board ID %d\n", id);
187		return -ENODEV;
188	}
189
190	dev_info(&i2c->dev, "revision %d\n", rev + 1);
191
192	ret = wm1250_ev1_pdata(i2c);
193	if (ret != 0)
194		return ret;
195
196	ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
197				     &wm1250_ev1_dai, 1);
198	if (ret != 0) {
199		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
200		return ret;
201	}
202
203	return 0;
204}
205
206static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
207	{ "wm1250-ev1", 0 },
208	{ }
209};
210MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
211
212static struct i2c_driver wm1250_ev1_i2c_driver = {
213	.driver = {
214		.name = "wm1250-ev1",
215	},
216	.probe =    wm1250_ev1_probe,
217	.id_table = wm1250_ev1_i2c_id,
218};
219
220module_i2c_driver(wm1250_ev1_i2c_driver);
221
222MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
223MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
224MODULE_LICENSE("GPL");
225