339bcf3b49
Implement an API to allow a list of pincfgs to be remuxed to active and sleep modes, for power saving. This is not exported on purpose, because it is not to be called by drivers directly. Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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* License terms: GNU General Public License (GPL), version 2
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/err.h>
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#include <plat/pincfg.h>
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#include "pins.h"
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static LIST_HEAD(pin_lookups);
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static DEFINE_MUTEX(pin_lookups_mutex);
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static DEFINE_SPINLOCK(pins_lock);
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void __init ux500_pins_add(struct ux500_pin_lookup *pl, size_t num)
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{
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mutex_lock(&pin_lookups_mutex);
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while (num--) {
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list_add_tail(&pl->node, &pin_lookups);
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pl++;
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}
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mutex_unlock(&pin_lookups_mutex);
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}
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struct ux500_pins *ux500_pins_get(const char *name)
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{
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struct ux500_pins *pins = NULL;
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struct ux500_pin_lookup *pl;
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mutex_lock(&pin_lookups_mutex);
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list_for_each_entry(pl, &pin_lookups, node) {
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if (!strcmp(pl->name, name)) {
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pins = pl->pins;
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goto out;
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}
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}
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out:
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mutex_unlock(&pin_lookups_mutex);
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return pins;
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}
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int ux500_pins_enable(struct ux500_pins *pins)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&pins_lock, flags);
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if (pins->usage++ == 0)
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ret = nmk_config_pins(pins->cfg, pins->num);
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spin_unlock_irqrestore(&pins_lock, flags);
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return ret;
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}
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int ux500_pins_disable(struct ux500_pins *pins)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&pins_lock, flags);
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if (WARN_ON(pins->usage == 0))
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goto out;
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if (--pins->usage == 0)
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ret = nmk_config_pins_sleep(pins->cfg, pins->num);
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out:
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spin_unlock_irqrestore(&pins_lock, flags);
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return ret;
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}
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void ux500_pins_put(struct ux500_pins *pins)
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{
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WARN_ON(!pins);
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}
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