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1963a2af GB |
1 | /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | * | |
12 | * You should have received a copy of the GNU General Public License | |
13 | * along with this program; if not, write to the Free Software | |
14 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
15 | * 02110-1301, USA. | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include "gpiomux.h" | |
20 | ||
21 | static DEFINE_SPINLOCK(gpiomux_lock); | |
22 | ||
23 | int msm_gpiomux_write(unsigned gpio, | |
24 | gpiomux_config_t active, | |
25 | gpiomux_config_t suspended) | |
26 | { | |
27 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
28 | unsigned long irq_flags; | |
29 | gpiomux_config_t setting; | |
30 | ||
31 | if (gpio >= GPIOMUX_NGPIOS) | |
32 | return -EINVAL; | |
33 | ||
34 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
35 | ||
36 | if (active & GPIOMUX_VALID) | |
37 | cfg->active = active; | |
38 | ||
39 | if (suspended & GPIOMUX_VALID) | |
40 | cfg->suspended = suspended; | |
41 | ||
42 | setting = cfg->ref ? active : suspended; | |
43 | if (setting & GPIOMUX_VALID) | |
44 | __msm_gpiomux_write(gpio, setting); | |
45 | ||
46 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
47 | return 0; | |
48 | } | |
49 | EXPORT_SYMBOL(msm_gpiomux_write); | |
50 | ||
51 | int msm_gpiomux_get(unsigned gpio) | |
52 | { | |
53 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
54 | unsigned long irq_flags; | |
55 | ||
56 | if (gpio >= GPIOMUX_NGPIOS) | |
57 | return -EINVAL; | |
58 | ||
59 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
60 | if (cfg->ref++ == 0 && cfg->active & GPIOMUX_VALID) | |
61 | __msm_gpiomux_write(gpio, cfg->active); | |
62 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
63 | return 0; | |
64 | } | |
65 | EXPORT_SYMBOL(msm_gpiomux_get); | |
66 | ||
67 | int msm_gpiomux_put(unsigned gpio) | |
68 | { | |
69 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
70 | unsigned long irq_flags; | |
71 | ||
72 | if (gpio >= GPIOMUX_NGPIOS) | |
73 | return -EINVAL; | |
74 | ||
75 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
76 | BUG_ON(cfg->ref == 0); | |
77 | if (--cfg->ref == 0 && cfg->suspended & GPIOMUX_VALID) | |
78 | __msm_gpiomux_write(gpio, cfg->suspended); | |
79 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
80 | return 0; | |
81 | } | |
82 | EXPORT_SYMBOL(msm_gpiomux_put); | |
83 | ||
84 | static int __init gpiomux_init(void) | |
85 | { | |
86 | unsigned n; | |
87 | ||
88 | for (n = 0; n < GPIOMUX_NGPIOS; ++n) { | |
89 | msm_gpiomux_configs[n].ref = 0; | |
90 | if (!(msm_gpiomux_configs[n].suspended & GPIOMUX_VALID)) | |
91 | continue; | |
92 | __msm_gpiomux_write(n, msm_gpiomux_configs[n].suspended); | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | postcore_initcall(gpiomux_init); |