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Linux/drivers/power/reset/vexpress-poweroff.c

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License version 2 as
  4  * published by the Free Software Foundation.
  5  *
  6  * This program is distributed in the hope that it will be useful,
  7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  * GNU General Public License for more details.
 10  *
 11  * Copyright (C) 2012 ARM Limited
 12  */
 13 
 14 #include <linux/delay.h>
 15 #include <linux/of.h>
 16 #include <linux/of_device.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/stat.h>
 19 #include <linux/vexpress.h>
 20 
 21 #include <asm/system_misc.h>
 22 
 23 static void vexpress_reset_do(struct device *dev, const char *what)
 24 {
 25         int err = -ENOENT;
 26         struct regmap *reg = dev_get_drvdata(dev);
 27 
 28         if (reg) {
 29                 err = regmap_write(reg, 0, 0);
 30                 if (!err)
 31                         mdelay(1000);
 32         }
 33 
 34         dev_emerg(dev, "Unable to %s (%d)\n", what, err);
 35 }
 36 
 37 static struct device *vexpress_power_off_device;
 38 
 39 static void vexpress_power_off(void)
 40 {
 41         vexpress_reset_do(vexpress_power_off_device, "power off");
 42 }
 43 
 44 static struct device *vexpress_restart_device;
 45 
 46 static void vexpress_restart(enum reboot_mode reboot_mode, const char *cmd)
 47 {
 48         vexpress_reset_do(vexpress_restart_device, "restart");
 49 }
 50 
 51 static ssize_t vexpress_reset_active_show(struct device *dev,
 52                 struct device_attribute *attr, char *buf)
 53 {
 54         return sprintf(buf, "%d\n", vexpress_restart_device == dev);
 55 }
 56 
 57 static ssize_t vexpress_reset_active_store(struct device *dev,
 58                 struct device_attribute *attr, const char *buf, size_t count)
 59 {
 60         long value;
 61         int err = kstrtol(buf, 0, &value);
 62 
 63         if (!err && value)
 64                 vexpress_restart_device = dev;
 65 
 66         return err ? err : count;
 67 }
 68 
 69 DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show,
 70                 vexpress_reset_active_store);
 71 
 72 
 73 enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT };
 74 
 75 static struct of_device_id vexpress_reset_of_match[] = {
 76         {
 77                 .compatible = "arm,vexpress-reset",
 78                 .data = (void *)FUNC_RESET,
 79         }, {
 80                 .compatible = "arm,vexpress-shutdown",
 81                 .data = (void *)FUNC_SHUTDOWN
 82         }, {
 83                 .compatible = "arm,vexpress-reboot",
 84                 .data = (void *)FUNC_REBOOT
 85         },
 86         {}
 87 };
 88 
 89 static int vexpress_reset_probe(struct platform_device *pdev)
 90 {
 91         enum vexpress_reset_func func;
 92         const struct of_device_id *match =
 93                         of_match_device(vexpress_reset_of_match, &pdev->dev);
 94         struct regmap *regmap;
 95 
 96         if (match)
 97                 func = (enum vexpress_reset_func)match->data;
 98         else
 99                 func = pdev->id_entry->driver_data;
100 
101         regmap = devm_regmap_init_vexpress_config(&pdev->dev);
102         if (IS_ERR(regmap))
103                 return PTR_ERR(regmap);
104         dev_set_drvdata(&pdev->dev, regmap);
105 
106         switch (func) {
107         case FUNC_SHUTDOWN:
108                 vexpress_power_off_device = &pdev->dev;
109                 pm_power_off = vexpress_power_off;
110                 break;
111         case FUNC_RESET:
112                 if (!vexpress_restart_device)
113                         vexpress_restart_device = &pdev->dev;
114                 arm_pm_restart = vexpress_restart;
115                 device_create_file(&pdev->dev, &dev_attr_active);
116                 break;
117         case FUNC_REBOOT:
118                 vexpress_restart_device = &pdev->dev;
119                 arm_pm_restart = vexpress_restart;
120                 device_create_file(&pdev->dev, &dev_attr_active);
121                 break;
122         };
123 
124         return 0;
125 }
126 
127 static const struct platform_device_id vexpress_reset_id_table[] = {
128         { .name = "vexpress-reset", .driver_data = FUNC_RESET, },
129         { .name = "vexpress-shutdown", .driver_data = FUNC_SHUTDOWN, },
130         { .name = "vexpress-reboot", .driver_data = FUNC_REBOOT, },
131         {}
132 };
133 
134 static struct platform_driver vexpress_reset_driver = {
135         .probe = vexpress_reset_probe,
136         .driver = {
137                 .name = "vexpress-reset",
138                 .of_match_table = vexpress_reset_of_match,
139         },
140         .id_table = vexpress_reset_id_table,
141 };
142 
143 static int __init vexpress_reset_init(void)
144 {
145         return platform_driver_register(&vexpress_reset_driver);
146 }
147 device_initcall(vexpress_reset_init);
148 

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