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1 | /* | |
2 | * MFD driver for twl4030 audio submodule, which contains an audio codec, and | |
3 | * the vibra control. | |
4 | * | |
5 | * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> | |
6 | * | |
7 | * Copyright: (C) 2009 Nokia Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/i2c/twl.h> | |
32 | #include <linux/mfd/core.h> | |
33 | #include <linux/mfd/twl4030-audio.h> | |
34 | ||
35 | #define TWL4030_AUDIO_CELLS 2 | |
36 | ||
37 | static struct platform_device *twl4030_audio_dev; | |
38 | ||
39 | struct twl4030_audio_resource { | |
40 | int request_count; | |
41 | u8 reg; | |
42 | u8 mask; | |
43 | }; | |
44 | ||
45 | struct twl4030_audio { | |
46 | unsigned int audio_mclk; | |
47 | struct mutex mutex; | |
48 | struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX]; | |
49 | struct mfd_cell cells[TWL4030_AUDIO_CELLS]; | |
50 | }; | |
51 | ||
52 | /* | |
53 | * Modify the resource, the function returns the content of the register | |
54 | * after the modification. | |
55 | */ | |
56 | static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable) | |
57 | { | |
58 | struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); | |
59 | u8 val; | |
60 | ||
61 | twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val, | |
62 | audio->resource[id].reg); | |
63 | ||
64 | if (enable) | |
65 | val |= audio->resource[id].mask; | |
66 | else | |
67 | val &= ~audio->resource[id].mask; | |
68 | ||
69 | twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, | |
70 | val, audio->resource[id].reg); | |
71 | ||
72 | return val; | |
73 | } | |
74 | ||
75 | static inline int twl4030_audio_get_resource(enum twl4030_audio_res id) | |
76 | { | |
77 | struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); | |
78 | u8 val; | |
79 | ||
80 | twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val, | |
81 | audio->resource[id].reg); | |
82 | ||
83 | return val; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Enable the resource. | |
88 | * The function returns with error or the content of the register | |
89 | */ | |
90 | int twl4030_audio_enable_resource(enum twl4030_audio_res id) | |
91 | { | |
92 | struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); | |
93 | int val; | |
94 | ||
95 | if (id >= TWL4030_AUDIO_RES_MAX) { | |
96 | dev_err(&twl4030_audio_dev->dev, | |
97 | "Invalid resource ID (%u)\n", id); | |
98 | return -EINVAL; | |
99 | } | |
100 | ||
101 | mutex_lock(&audio->mutex); | |
102 | if (!audio->resource[id].request_count) | |
103 | /* Resource was disabled, enable it */ | |
104 | val = twl4030_audio_set_resource(id, 1); | |
105 | else | |
106 | val = twl4030_audio_get_resource(id); | |
107 | ||
108 | audio->resource[id].request_count++; | |
109 | mutex_unlock(&audio->mutex); | |
110 | ||
111 | return val; | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource); | |
114 | ||
115 | /* | |
116 | * Disable the resource. | |
117 | * The function returns with error or the content of the register | |
118 | */ | |
119 | int twl4030_audio_disable_resource(unsigned id) | |
120 | { | |
121 | struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); | |
122 | int val; | |
123 | ||
124 | if (id >= TWL4030_AUDIO_RES_MAX) { | |
125 | dev_err(&twl4030_audio_dev->dev, | |
126 | "Invalid resource ID (%u)\n", id); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | mutex_lock(&audio->mutex); | |
131 | if (!audio->resource[id].request_count) { | |
132 | dev_err(&twl4030_audio_dev->dev, | |
133 | "Resource has been disabled already (%u)\n", id); | |
134 | mutex_unlock(&audio->mutex); | |
135 | return -EPERM; | |
136 | } | |
137 | audio->resource[id].request_count--; | |
138 | ||
139 | if (!audio->resource[id].request_count) | |
140 | /* Resource can be disabled now */ | |
141 | val = twl4030_audio_set_resource(id, 0); | |
142 | else | |
143 | val = twl4030_audio_get_resource(id); | |
144 | ||
145 | mutex_unlock(&audio->mutex); | |
146 | ||
147 | return val; | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource); | |
150 | ||
151 | unsigned int twl4030_audio_get_mclk(void) | |
152 | { | |
153 | struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev); | |
154 | ||
155 | return audio->audio_mclk; | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk); | |
158 | ||
159 | static int __devinit twl4030_audio_probe(struct platform_device *pdev) | |
160 | { | |
161 | struct twl4030_audio *audio; | |
162 | struct twl4030_audio_data *pdata = pdev->dev.platform_data; | |
163 | struct mfd_cell *cell = NULL; | |
164 | int ret, childs = 0; | |
165 | u8 val; | |
166 | ||
167 | if (!pdata) { | |
168 | dev_err(&pdev->dev, "Platform data is missing\n"); | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | /* Configure APLL_INFREQ and disable APLL if enabled */ | |
173 | val = 0; | |
174 | switch (pdata->audio_mclk) { | |
175 | case 19200000: | |
176 | val |= TWL4030_APLL_INFREQ_19200KHZ; | |
177 | break; | |
178 | case 26000000: | |
179 | val |= TWL4030_APLL_INFREQ_26000KHZ; | |
180 | break; | |
181 | case 38400000: | |
182 | val |= TWL4030_APLL_INFREQ_38400KHZ; | |
183 | break; | |
184 | default: | |
185 | dev_err(&pdev->dev, "Invalid audio_mclk\n"); | |
186 | return -EINVAL; | |
187 | } | |
188 | twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, | |
189 | val, TWL4030_REG_APLL_CTL); | |
190 | ||
191 | audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL); | |
192 | if (!audio) | |
193 | return -ENOMEM; | |
194 | ||
195 | platform_set_drvdata(pdev, audio); | |
196 | ||
197 | twl4030_audio_dev = pdev; | |
198 | mutex_init(&audio->mutex); | |
199 | audio->audio_mclk = pdata->audio_mclk; | |
200 | ||
201 | /* Codec power */ | |
202 | audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE; | |
203 | audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ; | |
204 | ||
205 | /* PLL */ | |
206 | audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL; | |
207 | audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN; | |
208 | ||
209 | if (pdata->codec) { | |
210 | cell = &audio->cells[childs]; | |
211 | cell->name = "twl4030-codec"; | |
212 | cell->platform_data = pdata->codec; | |
213 | cell->pdata_size = sizeof(*pdata->codec); | |
214 | childs++; | |
215 | } | |
216 | if (pdata->vibra) { | |
217 | cell = &audio->cells[childs]; | |
218 | cell->name = "twl4030-vibra"; | |
219 | cell->platform_data = pdata->vibra; | |
220 | cell->pdata_size = sizeof(*pdata->vibra); | |
221 | childs++; | |
222 | } | |
223 | ||
224 | if (childs) | |
225 | ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells, | |
226 | childs, NULL, 0); | |
227 | else { | |
228 | dev_err(&pdev->dev, "No platform data found for childs\n"); | |
229 | ret = -ENODEV; | |
230 | } | |
231 | ||
232 | if (!ret) | |
233 | return 0; | |
234 | ||
235 | platform_set_drvdata(pdev, NULL); | |
236 | kfree(audio); | |
237 | twl4030_audio_dev = NULL; | |
238 | return ret; | |
239 | } | |
240 | ||
241 | static int __devexit twl4030_audio_remove(struct platform_device *pdev) | |
242 | { | |
243 | struct twl4030_audio *audio = platform_get_drvdata(pdev); | |
244 | ||
245 | mfd_remove_devices(&pdev->dev); | |
246 | platform_set_drvdata(pdev, NULL); | |
247 | kfree(audio); | |
248 | twl4030_audio_dev = NULL; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | MODULE_ALIAS("platform:twl4030-audio"); | |
254 | ||
255 | static struct platform_driver twl4030_audio_driver = { | |
256 | .probe = twl4030_audio_probe, | |
257 | .remove = __devexit_p(twl4030_audio_remove), | |
258 | .driver = { | |
259 | .owner = THIS_MODULE, | |
260 | .name = "twl4030-audio", | |
261 | }, | |
262 | }; | |
263 | ||
264 | module_platform_driver(twl4030_audio_driver); | |
265 | ||
266 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
267 | MODULE_LICENSE("GPL"); |