[PATCH] introduce .valid callback for pm_ops
[linux-2.6.git] / drivers / acpi / sleep / main.c
1 /*
2  * sleep.c - ACPI sleep support.
3  *
4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
6  * Copyright (c) 2000-2003 Patrick Mochel
7  * Copyright (c) 2003 Open Source Development Lab
8  *
9  * This file is released under the GPLv2.
10  *
11  */
12
13 #include <linux/delay.h>
14 #include <linux/irq.h>
15 #include <linux/dmi.h>
16 #include <linux/device.h>
17 #include <linux/suspend.h>
18 #include <acpi/acpi_bus.h>
19 #include <acpi/acpi_drivers.h>
20 #include "sleep.h"
21
22 u8 sleep_states[ACPI_S_STATE_COUNT];
23
24 static struct pm_ops acpi_pm_ops;
25
26 extern void do_suspend_lowlevel(void);
27
28 static u32 acpi_suspend_states[] = {
29         [PM_SUSPEND_ON] = ACPI_STATE_S0,
30         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
31         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
32         [PM_SUSPEND_DISK] = ACPI_STATE_S4,
33         [PM_SUSPEND_MAX] = ACPI_STATE_S5
34 };
35
36 static int init_8259A_after_S1;
37
38 /**
39  *      acpi_pm_prepare - Do preliminary suspend work.
40  *      @pm_state:              suspend state we're entering.
41  *
42  *      Make sure we support the state. If we do, and we need it, set the
43  *      firmware waking vector and do arch-specific nastiness to get the 
44  *      wakeup code to the waking vector. 
45  */
46
47 extern int acpi_sleep_prepare(u32 acpi_state);
48 extern void acpi_power_off(void);
49
50 static int acpi_pm_prepare(suspend_state_t pm_state)
51 {
52         u32 acpi_state = acpi_suspend_states[pm_state];
53
54         if (!sleep_states[acpi_state]) {
55                 printk("acpi_pm_prepare does not support %d \n", pm_state);
56                 return -EPERM;
57         }
58         return acpi_sleep_prepare(acpi_state);
59 }
60
61 /**
62  *      acpi_pm_enter - Actually enter a sleep state.
63  *      @pm_state:              State we're entering.
64  *
65  *      Flush caches and go to sleep. For STR or STD, we have to call 
66  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
67  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
68  */
69
70 static int acpi_pm_enter(suspend_state_t pm_state)
71 {
72         acpi_status status = AE_OK;
73         unsigned long flags = 0;
74         u32 acpi_state = acpi_suspend_states[pm_state];
75
76         ACPI_FLUSH_CPU_CACHE();
77
78         /* Do arch specific saving of state. */
79         if (pm_state > PM_SUSPEND_STANDBY) {
80                 int error = acpi_save_state_mem();
81                 if (error)
82                         return error;
83         }
84
85         local_irq_save(flags);
86         acpi_enable_wakeup_device(acpi_state);
87         switch (pm_state) {
88         case PM_SUSPEND_STANDBY:
89                 barrier();
90                 status = acpi_enter_sleep_state(acpi_state);
91                 break;
92
93         case PM_SUSPEND_MEM:
94                 do_suspend_lowlevel();
95                 break;
96
97         case PM_SUSPEND_DISK:
98                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
99                         status = acpi_enter_sleep_state(acpi_state);
100                 break;
101         case PM_SUSPEND_MAX:
102                 acpi_power_off();
103                 break;
104
105         default:
106                 return -EINVAL;
107         }
108         local_irq_restore(flags);
109         printk(KERN_DEBUG "Back to C!\n");
110
111         /* restore processor state
112          * We should only be here if we're coming back from STR or STD.
113          * And, in the case of the latter, the memory image should have already
114          * been loaded from disk.
115          */
116         if (pm_state > PM_SUSPEND_STANDBY)
117                 acpi_restore_state_mem();
118
119         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
120 }
121
122 /**
123  *      acpi_pm_finish - Finish up suspend sequence.
124  *      @pm_state:              State we're coming out of.
125  *
126  *      This is called after we wake back up (or if entering the sleep state
127  *      failed). 
128  */
129
130 static int acpi_pm_finish(suspend_state_t pm_state)
131 {
132         u32 acpi_state = acpi_suspend_states[pm_state];
133
134         acpi_leave_sleep_state(acpi_state);
135         acpi_disable_wakeup_device(acpi_state);
136
137         /* reset firmware waking vector */
138         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
139
140         if (init_8259A_after_S1) {
141                 printk("Broken toshiba laptop -> kicking interrupts\n");
142                 init_8259A(0);
143         }
144         return 0;
145 }
146
147 int acpi_suspend(u32 acpi_state)
148 {
149         suspend_state_t states[] = {
150                 [1] = PM_SUSPEND_STANDBY,
151                 [3] = PM_SUSPEND_MEM,
152                 [4] = PM_SUSPEND_DISK,
153                 [5] = PM_SUSPEND_MAX
154         };
155
156         if (acpi_state < 6 && states[acpi_state])
157                 return pm_suspend(states[acpi_state]);
158         return -EINVAL;
159 }
160
161 static int acpi_pm_state_valid(suspend_state_t pm_state)
162 {
163         u32 acpi_state = acpi_suspend_states[pm_state];
164
165         return sleep_states[acpi_state];
166 }
167
168 static struct pm_ops acpi_pm_ops = {
169         .valid = acpi_pm_state_valid,
170         .prepare = acpi_pm_prepare,
171         .enter = acpi_pm_enter,
172         .finish = acpi_pm_finish,
173 };
174
175 /*
176  * Toshiba fails to preserve interrupts over S1, reinitialization
177  * of 8259 is needed after S1 resume.
178  */
179 static int __init init_ints_after_s1(struct dmi_system_id *d)
180 {
181         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
182         init_8259A_after_S1 = 1;
183         return 0;
184 }
185
186 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
187         {
188          .callback = init_ints_after_s1,
189          .ident = "Toshiba Satellite 4030cdt",
190          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
191          },
192         {},
193 };
194
195 static int __init acpi_sleep_init(void)
196 {
197         int i = 0;
198
199         dmi_check_system(acpisleep_dmi_table);
200
201         if (acpi_disabled)
202                 return 0;
203
204         printk(KERN_INFO PREFIX "(supports");
205         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
206                 acpi_status status;
207                 u8 type_a, type_b;
208                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
209                 if (ACPI_SUCCESS(status)) {
210                         sleep_states[i] = 1;
211                         printk(" S%d", i);
212                 }
213                 if (i == ACPI_STATE_S4) {
214                         if (sleep_states[i])
215                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
216                 }
217         }
218         printk(")\n");
219
220         pm_set_ops(&acpi_pm_ops);
221         return 0;
222 }
223
224 late_initcall(acpi_sleep_init);