projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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" | |
| eda9dcfa | 20 | #include "proc_comm.h" |
| 1963a2af GB |
21 | |
| 22 | static DEFINE_SPINLOCK(gpiomux_lock); | |
| 23 | ||
| eda9dcfa RV |
24 | static void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val) |
| 25 | { | |
| 26 | unsigned tlmm_config = (val & ~GPIOMUX_CTL_MASK) | | |
| 27 | ((gpio & 0x3ff) << 4); | |
| 28 | unsigned tlmm_disable = 0; | |
| 29 | int rc; | |
| 30 | ||
| 31 | rc = msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX, | |
| 32 | &tlmm_config, &tlmm_disable); | |
| 33 | if (rc) | |
| 34 | pr_err("%s: unexpected proc_comm failure %d: %08x %08x\n", | |
| 35 | __func__, rc, tlmm_config, tlmm_disable); | |
| 36 | } | |
| 37 | ||
| 1963a2af GB |
38 | int msm_gpiomux_write(unsigned gpio, |
| 39 | gpiomux_config_t active, | |
| 40 | gpiomux_config_t suspended) | |
| 41 | { | |
| 42 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
| 43 | unsigned long irq_flags; | |
| 44 | gpiomux_config_t setting; | |
| 45 | ||
| 46 | if (gpio >= GPIOMUX_NGPIOS) | |
| 47 | return -EINVAL; | |
| 48 | ||
| 49 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
| 50 | ||
| 51 | if (active & GPIOMUX_VALID) | |
| 52 | cfg->active = active; | |
| 53 | ||
| 54 | if (suspended & GPIOMUX_VALID) | |
| 55 | cfg->suspended = suspended; | |
| 56 | ||
| 57 | setting = cfg->ref ? active : suspended; | |
| 58 | if (setting & GPIOMUX_VALID) | |
| 59 | __msm_gpiomux_write(gpio, setting); | |
| 60 | ||
| 61 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
| 62 | return 0; | |
| 63 | } | |
| 64 | EXPORT_SYMBOL(msm_gpiomux_write); | |
| 65 | ||
| 66 | int msm_gpiomux_get(unsigned gpio) | |
| 67 | { | |
| 68 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
| 69 | unsigned long irq_flags; | |
| 70 | ||
| 71 | if (gpio >= GPIOMUX_NGPIOS) | |
| 72 | return -EINVAL; | |
| 73 | ||
| 74 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
| 75 | if (cfg->ref++ == 0 && cfg->active & GPIOMUX_VALID) | |
| 76 | __msm_gpiomux_write(gpio, cfg->active); | |
| 77 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
| 78 | return 0; | |
| 79 | } | |
| 80 | EXPORT_SYMBOL(msm_gpiomux_get); | |
| 81 | ||
| 82 | int msm_gpiomux_put(unsigned gpio) | |
| 83 | { | |
| 84 | struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio; | |
| 85 | unsigned long irq_flags; | |
| 86 | ||
| 87 | if (gpio >= GPIOMUX_NGPIOS) | |
| 88 | return -EINVAL; | |
| 89 | ||
| 90 | spin_lock_irqsave(&gpiomux_lock, irq_flags); | |
| 91 | BUG_ON(cfg->ref == 0); | |
| 92 | if (--cfg->ref == 0 && cfg->suspended & GPIOMUX_VALID) | |
| 93 | __msm_gpiomux_write(gpio, cfg->suspended); | |
| 94 | spin_unlock_irqrestore(&gpiomux_lock, irq_flags); | |
| 95 | return 0; | |
| 96 | } | |
| 97 | EXPORT_SYMBOL(msm_gpiomux_put); | |
| 98 | ||
| 99 | static int __init gpiomux_init(void) | |
| 100 | { | |
| 101 | unsigned n; | |
| 102 | ||
| 103 | for (n = 0; n < GPIOMUX_NGPIOS; ++n) { | |
| 104 | msm_gpiomux_configs[n].ref = 0; | |
| 105 | if (!(msm_gpiomux_configs[n].suspended & GPIOMUX_VALID)) | |
| 106 | continue; | |
| 107 | __msm_gpiomux_write(n, msm_gpiomux_configs[n].suspended); | |
| 108 | } | |
| 109 | return 0; | |
| 110 | } | |
| 111 | postcore_initcall(gpiomux_init); |