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13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/i2c.h>
17#include <linux/gpio.h>
18
19#include <sound/soc.h>
20#include <sound/soc-dapm.h>
21#include <sound/wm1250-ev1.h>
22
23static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
24 "WM1250 CLK_ENA",
25 "WM1250 CLK_SEL0",
26 "WM1250 CLK_SEL1",
27 "WM1250 OSR",
28 "WM1250 MASTER",
29};
30
31struct wm1250_priv {
32 struct gpio gpios[WM1250_EV1_NUM_GPIOS];
33};
34
35static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
36 enum snd_soc_bias_level level)
37{
38 struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
39 int ena;
40
41 if (wm1250)
42 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
43 else
44 ena = -1;
45
46 switch (level) {
47 case SND_SOC_BIAS_ON:
48 break;
49
50 case SND_SOC_BIAS_PREPARE:
51 break;
52
53 case SND_SOC_BIAS_STANDBY:
54 if (ena >= 0)
55 gpio_set_value_cansleep(ena, 1);
56 break;
57
58 case SND_SOC_BIAS_OFF:
59 if (ena >= 0)
60 gpio_set_value_cansleep(ena, 0);
61 break;
62 }
63
64 codec->dapm.bias_level = level;
65
66 return 0;
67}
68
69static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
70SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
71SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
72
73SND_SOC_DAPM_INPUT("WM1250 Input"),
74SND_SOC_DAPM_OUTPUT("WM1250 Output"),
75};
76
77static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
78 { "ADC", NULL, "WM1250 Input" },
79 { "WM1250 Output", NULL, "DAC" },
80};
81
82static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
83 struct snd_pcm_hw_params *params,
84 struct snd_soc_dai *dai)
85{
86 struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
87
88 switch (params_rate(params)) {
89 case 8000:
90 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
91 1);
92 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
93 1);
94 break;
95 case 16000:
96 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
97 0);
98 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
99 1);
100 break;
101 case 32000:
102 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
103 1);
104 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
105 0);
106 break;
107 case 64000:
108 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
109 0);
110 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
111 0);
112 break;
113 default:
114 return -EINVAL;
115 }
116
117 return 0;
118}
119
120static const struct snd_soc_dai_ops wm1250_ev1_ops = {
121 .hw_params = wm1250_ev1_hw_params,
122};
123
124#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
125 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
126
127static struct snd_soc_dai_driver wm1250_ev1_dai = {
128 .name = "wm1250-ev1",
129 .playback = {
130 .stream_name = "Playback",
131 .channels_min = 1,
132 .channels_max = 2,
133 .rates = WM1250_EV1_RATES,
134 .formats = SNDRV_PCM_FMTBIT_S16_LE,
135 },
136 .capture = {
137 .stream_name = "Capture",
138 .channels_min = 1,
139 .channels_max = 2,
140 .rates = WM1250_EV1_RATES,
141 .formats = SNDRV_PCM_FMTBIT_S16_LE,
142 },
143 .ops = &wm1250_ev1_ops,
144};
145
146static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
147 .dapm_widgets = wm1250_ev1_dapm_widgets,
148 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
149 .dapm_routes = wm1250_ev1_dapm_routes,
150 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
151
152 .set_bias_level = wm1250_ev1_set_bias_level,
153 .idle_bias_off = true,
154};
155
156static int wm1250_ev1_pdata(struct i2c_client *i2c)
157{
158 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
159 struct wm1250_priv *wm1250;
160 int i, ret;
161
162 if (!pdata)
163 return 0;
164
165 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
166 if (!wm1250) {
167 dev_err(&i2c->dev, "Unable to allocate private data\n");
168 ret = -ENOMEM;
169 goto err;
170 }
171
172 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
173 wm1250->gpios[i].gpio = pdata->gpios[i];
174 wm1250->gpios[i].label = wm1250_gpio_names[i];
175 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
176 }
177 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
178 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
179
180 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
181 if (ret != 0) {
182 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
183 goto err;
184 }
185
186 dev_set_drvdata(&i2c->dev, wm1250);
187
188 return ret;
189
190err:
191 return ret;
192}
193
194static void wm1250_ev1_free(struct i2c_client *i2c)
195{
196 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
197
198 if (wm1250)
199 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
200}
201
202static int wm1250_ev1_probe(struct i2c_client *i2c,
203 const struct i2c_device_id *i2c_id)
204{
205 int id, board, rev, ret;
206
207 dev_set_drvdata(&i2c->dev, NULL);
208
209 board = i2c_smbus_read_byte_data(i2c, 0);
210 if (board < 0) {
211 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
212 return board;
213 }
214
215 id = (board & 0xfe) >> 2;
216 rev = board & 0x3;
217
218 if (id != 1) {
219 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
220 return -ENODEV;
221 }
222
223 dev_info(&i2c->dev, "revision %d\n", rev + 1);
224
225 ret = wm1250_ev1_pdata(i2c);
226 if (ret != 0)
227 return ret;
228
229 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
230 &wm1250_ev1_dai, 1);
231 if (ret != 0) {
232 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
233 wm1250_ev1_free(i2c);
234 return ret;
235 }
236
237 return 0;
238}
239
240static int wm1250_ev1_remove(struct i2c_client *i2c)
241{
242 snd_soc_unregister_codec(&i2c->dev);
243 wm1250_ev1_free(i2c);
244
245 return 0;
246}
247
248static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
249 { "wm1250-ev1", 0 },
250 { }
251};
252MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
253
254static struct i2c_driver wm1250_ev1_i2c_driver = {
255 .driver = {
256 .name = "wm1250-ev1",
257 .owner = THIS_MODULE,
258 },
259 .probe = wm1250_ev1_probe,
260 .remove = wm1250_ev1_remove,
261 .id_table = wm1250_ev1_i2c_id,
262};
263
264module_i2c_driver(wm1250_ev1_i2c_driver);
265
266MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
267MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
268MODULE_LICENSE("GPL");
269
