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Linux/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c

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  1 /*
  2  * MPIC timer wakeup driver
  3  *
  4  * Copyright 2013 Freescale Semiconductor, Inc.
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the
  8  * Free Software Foundation; either version 2 of the License, or (at your
  9  * option) any later version.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/slab.h>
 14 #include <linux/errno.h>
 15 #include <linux/module.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/device.h>
 18 
 19 #include <asm/mpic_timer.h>
 20 #include <asm/mpic.h>
 21 
 22 struct fsl_mpic_timer_wakeup {
 23         struct mpic_timer *timer;
 24         struct work_struct free_work;
 25 };
 26 
 27 static struct fsl_mpic_timer_wakeup *fsl_wakeup;
 28 static DEFINE_MUTEX(sysfs_lock);
 29 
 30 static void fsl_free_resource(struct work_struct *ws)
 31 {
 32         struct fsl_mpic_timer_wakeup *wakeup =
 33                 container_of(ws, struct fsl_mpic_timer_wakeup, free_work);
 34 
 35         mutex_lock(&sysfs_lock);
 36 
 37         if (wakeup->timer) {
 38                 disable_irq_wake(wakeup->timer->irq);
 39                 mpic_free_timer(wakeup->timer);
 40         }
 41 
 42         wakeup->timer = NULL;
 43         mutex_unlock(&sysfs_lock);
 44 }
 45 
 46 static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id)
 47 {
 48         struct fsl_mpic_timer_wakeup *wakeup = dev_id;
 49 
 50         schedule_work(&wakeup->free_work);
 51 
 52         return wakeup->timer ? IRQ_HANDLED : IRQ_NONE;
 53 }
 54 
 55 static ssize_t fsl_timer_wakeup_show(struct device *dev,
 56                                 struct device_attribute *attr,
 57                                 char *buf)
 58 {
 59         struct timeval interval;
 60         int val = 0;
 61 
 62         mutex_lock(&sysfs_lock);
 63         if (fsl_wakeup->timer) {
 64                 mpic_get_remain_time(fsl_wakeup->timer, &interval);
 65                 val = interval.tv_sec + 1;
 66         }
 67         mutex_unlock(&sysfs_lock);
 68 
 69         return sprintf(buf, "%d\n", val);
 70 }
 71 
 72 static ssize_t fsl_timer_wakeup_store(struct device *dev,
 73                                 struct device_attribute *attr,
 74                                 const char *buf,
 75                                 size_t count)
 76 {
 77         struct timeval interval;
 78         int ret;
 79 
 80         interval.tv_usec = 0;
 81         if (kstrtol(buf, 0, &interval.tv_sec))
 82                 return -EINVAL;
 83 
 84         mutex_lock(&sysfs_lock);
 85 
 86         if (fsl_wakeup->timer) {
 87                 disable_irq_wake(fsl_wakeup->timer->irq);
 88                 mpic_free_timer(fsl_wakeup->timer);
 89                 fsl_wakeup->timer = NULL;
 90         }
 91 
 92         if (!interval.tv_sec) {
 93                 mutex_unlock(&sysfs_lock);
 94                 return count;
 95         }
 96 
 97         fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq,
 98                                                 fsl_wakeup, &interval);
 99         if (!fsl_wakeup->timer) {
100                 mutex_unlock(&sysfs_lock);
101                 return -EINVAL;
102         }
103 
104         ret = enable_irq_wake(fsl_wakeup->timer->irq);
105         if (ret) {
106                 mpic_free_timer(fsl_wakeup->timer);
107                 fsl_wakeup->timer = NULL;
108                 mutex_unlock(&sysfs_lock);
109 
110                 return ret;
111         }
112 
113         mpic_start_timer(fsl_wakeup->timer);
114 
115         mutex_unlock(&sysfs_lock);
116 
117         return count;
118 }
119 
120 static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
121                         fsl_timer_wakeup_show, fsl_timer_wakeup_store);
122 
123 static int __init fsl_wakeup_sys_init(void)
124 {
125         int ret;
126 
127         fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
128         if (!fsl_wakeup)
129                 return -ENOMEM;
130 
131         INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource);
132 
133         ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes);
134         if (ret)
135                 kfree(fsl_wakeup);
136 
137         return ret;
138 }
139 
140 static void __exit fsl_wakeup_sys_exit(void)
141 {
142         device_remove_file(mpic_subsys.dev_root, &mpic_attributes);
143 
144         mutex_lock(&sysfs_lock);
145 
146         if (fsl_wakeup->timer) {
147                 disable_irq_wake(fsl_wakeup->timer->irq);
148                 mpic_free_timer(fsl_wakeup->timer);
149         }
150 
151         kfree(fsl_wakeup);
152 
153         mutex_unlock(&sysfs_lock);
154 }
155 
156 module_init(fsl_wakeup_sys_init);
157 module_exit(fsl_wakeup_sys_exit);
158 
159 MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
160 MODULE_LICENSE("GPL v2");
161 MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
162 

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