| Gregory Bean | 1963a2a | 2010-08-28 10:05:44 -0700 | [diff] [blame] | 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); |