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336b8423 LPC |
1 | /* |
2 | * soc-ac97.c -- ALSA SoC Audio Layer AC97 support | |
3 | * | |
4 | * Copyright 2005 Wolfson Microelectronics PLC. | |
5 | * Copyright 2005 Openedhand Ltd. | |
6 | * Copyright (C) 2010 Slimlogic Ltd. | |
7 | * Copyright (C) 2010 Texas Instruments Inc. | |
8 | * | |
9 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> | |
10 | * with code, comments and ideas from :- | |
11 | * Richard Purdie <richard@openedhand.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the | |
15 | * Free Software Foundation; either version 2 of the License, or (at your | |
16 | * option) any later version. | |
17 | */ | |
18 | ||
19 | #include <linux/ctype.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/export.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/of_gpio.h> | |
25 | #include <linux/of.h> | |
26 | #include <linux/pinctrl/consumer.h> | |
27 | #include <linux/slab.h> | |
28 | #include <sound/ac97_codec.h> | |
29 | #include <sound/soc.h> | |
30 | ||
31 | struct snd_ac97_reset_cfg { | |
32 | struct pinctrl *pctl; | |
33 | struct pinctrl_state *pstate_reset; | |
34 | struct pinctrl_state *pstate_warm_reset; | |
35 | struct pinctrl_state *pstate_run; | |
36 | int gpio_sdata; | |
37 | int gpio_sync; | |
38 | int gpio_reset; | |
39 | }; | |
40 | ||
eda1a701 LPC |
41 | static struct snd_ac97_bus soc_ac97_bus = { |
42 | .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ | |
43 | }; | |
44 | ||
336b8423 LPC |
45 | static void soc_ac97_device_release(struct device *dev) |
46 | { | |
47 | kfree(to_ac97_t(dev)); | |
48 | } | |
49 | ||
50 | /** | |
51 | * snd_soc_new_ac97_codec - initailise AC97 device | |
52 | * @codec: audio codec | |
336b8423 LPC |
53 | * |
54 | * Initialises AC97 codec resources for use by ad-hoc devices only. | |
55 | */ | |
358a8bb5 | 56 | struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec) |
336b8423 | 57 | { |
358a8bb5 | 58 | struct snd_ac97 *ac97; |
6794f709 LPC |
59 | int ret; |
60 | ||
358a8bb5 LPC |
61 | ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); |
62 | if (ac97 == NULL) | |
63 | return ERR_PTR(-ENOMEM); | |
336b8423 | 64 | |
358a8bb5 LPC |
65 | ac97->bus = &soc_ac97_bus; |
66 | ac97->num = 0; | |
6794f709 | 67 | |
358a8bb5 LPC |
68 | ac97->dev.bus = &ac97_bus_type; |
69 | ac97->dev.parent = codec->component.card->dev; | |
70 | ac97->dev.release = soc_ac97_device_release; | |
336b8423 | 71 | |
358a8bb5 | 72 | dev_set_name(&ac97->dev, "%d-%d:%s", |
6794f709 LPC |
73 | codec->component.card->snd_card->number, 0, |
74 | codec->component.name); | |
75 | ||
358a8bb5 LPC |
76 | ret = device_register(&ac97->dev); |
77 | if (ret) { | |
78 | put_device(&ac97->dev); | |
79 | return ERR_PTR(ret); | |
80 | } | |
336b8423 | 81 | |
358a8bb5 | 82 | return ac97; |
336b8423 LPC |
83 | } |
84 | EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); | |
85 | ||
86 | /** | |
87 | * snd_soc_free_ac97_codec - free AC97 codec device | |
88 | * @codec: audio codec | |
89 | * | |
90 | * Frees AC97 codec device resources. | |
91 | */ | |
358a8bb5 | 92 | void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) |
336b8423 | 93 | { |
358a8bb5 LPC |
94 | device_del(&ac97->dev); |
95 | ac97->bus = NULL; | |
96 | put_device(&ac97->dev); | |
336b8423 LPC |
97 | } |
98 | EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); | |
99 | ||
100 | static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; | |
101 | ||
102 | static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) | |
103 | { | |
104 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
105 | ||
106 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); | |
107 | ||
108 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); | |
109 | ||
110 | udelay(10); | |
111 | ||
112 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
113 | ||
114 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
115 | msleep(2); | |
116 | } | |
117 | ||
118 | static void snd_soc_ac97_reset(struct snd_ac97 *ac97) | |
119 | { | |
120 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
121 | ||
122 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); | |
123 | ||
124 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
125 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); | |
126 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); | |
127 | ||
128 | udelay(10); | |
129 | ||
130 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); | |
131 | ||
132 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
133 | msleep(2); | |
134 | } | |
135 | ||
136 | static int snd_soc_ac97_parse_pinctl(struct device *dev, | |
137 | struct snd_ac97_reset_cfg *cfg) | |
138 | { | |
139 | struct pinctrl *p; | |
140 | struct pinctrl_state *state; | |
141 | int gpio; | |
142 | int ret; | |
143 | ||
144 | p = devm_pinctrl_get(dev); | |
145 | if (IS_ERR(p)) { | |
146 | dev_err(dev, "Failed to get pinctrl\n"); | |
147 | return PTR_ERR(p); | |
148 | } | |
149 | cfg->pctl = p; | |
150 | ||
151 | state = pinctrl_lookup_state(p, "ac97-reset"); | |
152 | if (IS_ERR(state)) { | |
153 | dev_err(dev, "Can't find pinctrl state ac97-reset\n"); | |
154 | return PTR_ERR(state); | |
155 | } | |
156 | cfg->pstate_reset = state; | |
157 | ||
158 | state = pinctrl_lookup_state(p, "ac97-warm-reset"); | |
159 | if (IS_ERR(state)) { | |
160 | dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); | |
161 | return PTR_ERR(state); | |
162 | } | |
163 | cfg->pstate_warm_reset = state; | |
164 | ||
165 | state = pinctrl_lookup_state(p, "ac97-running"); | |
166 | if (IS_ERR(state)) { | |
167 | dev_err(dev, "Can't find pinctrl state ac97-running\n"); | |
168 | return PTR_ERR(state); | |
169 | } | |
170 | cfg->pstate_run = state; | |
171 | ||
172 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); | |
173 | if (gpio < 0) { | |
174 | dev_err(dev, "Can't find ac97-sync gpio\n"); | |
175 | return gpio; | |
176 | } | |
177 | ret = devm_gpio_request(dev, gpio, "AC97 link sync"); | |
178 | if (ret) { | |
179 | dev_err(dev, "Failed requesting ac97-sync gpio\n"); | |
180 | return ret; | |
181 | } | |
182 | cfg->gpio_sync = gpio; | |
183 | ||
184 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); | |
185 | if (gpio < 0) { | |
186 | dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); | |
187 | return gpio; | |
188 | } | |
189 | ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); | |
190 | if (ret) { | |
191 | dev_err(dev, "Failed requesting ac97-sdata gpio\n"); | |
192 | return ret; | |
193 | } | |
194 | cfg->gpio_sdata = gpio; | |
195 | ||
196 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); | |
197 | if (gpio < 0) { | |
198 | dev_err(dev, "Can't find ac97-reset gpio\n"); | |
199 | return gpio; | |
200 | } | |
201 | ret = devm_gpio_request(dev, gpio, "AC97 link reset"); | |
202 | if (ret) { | |
203 | dev_err(dev, "Failed requesting ac97-reset gpio\n"); | |
204 | return ret; | |
205 | } | |
206 | cfg->gpio_reset = gpio; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | struct snd_ac97_bus_ops *soc_ac97_ops; | |
212 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
213 | ||
214 | int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) | |
215 | { | |
216 | if (ops == soc_ac97_ops) | |
217 | return 0; | |
218 | ||
219 | if (soc_ac97_ops && ops) | |
220 | return -EBUSY; | |
221 | ||
222 | soc_ac97_ops = ops; | |
eda1a701 | 223 | soc_ac97_bus.ops = ops; |
336b8423 LPC |
224 | |
225 | return 0; | |
226 | } | |
227 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); | |
228 | ||
229 | /** | |
230 | * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions | |
231 | * | |
232 | * This function sets the reset and warm_reset properties of ops and parses | |
233 | * the device node of pdev to get pinctrl states and gpio numbers to use. | |
234 | */ | |
235 | int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, | |
236 | struct platform_device *pdev) | |
237 | { | |
238 | struct device *dev = &pdev->dev; | |
239 | struct snd_ac97_reset_cfg cfg; | |
240 | int ret; | |
241 | ||
242 | ret = snd_soc_ac97_parse_pinctl(dev, &cfg); | |
243 | if (ret) | |
244 | return ret; | |
245 | ||
246 | ret = snd_soc_set_ac97_ops(ops); | |
247 | if (ret) | |
248 | return ret; | |
249 | ||
250 | ops->warm_reset = snd_soc_ac97_warm_reset; | |
251 | ops->reset = snd_soc_ac97_reset; | |
252 | ||
253 | snd_ac97_rst_cfg = cfg; | |
254 | return 0; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); |