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1/*
2 * Support for OLPC XO-1.5 System Control Interrupts (SCI)
3 *
4 * Copyright (C) 2009-2010 One Laptop per Child
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/device.h>
13#include <linux/slab.h>
14#include <linux/workqueue.h>
15#include <linux/power_supply.h>
16
17#include <acpi/acpi_bus.h>
18#include <acpi/acpi_drivers.h>
19#include <asm/olpc.h>
20
21#define DRV_NAME "olpc-xo15-sci"
22#define PFX DRV_NAME ": "
23#define XO15_SCI_CLASS DRV_NAME
24#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
25
26static unsigned long xo15_sci_gpe;
27static bool lid_wake_on_close;
28
29/*
30 * The normal ACPI LID wakeup behavior is wake-on-open, but not
31 * wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
32 *
33 * We provide here a sysfs attribute that will additionally enable
34 * wake-on-close behavior. This is useful (e.g.) when we oportunistically
35 * suspend with the display running; if the lid is then closed, we want to
36 * wake up to turn the display off.
37 *
38 * This is controlled through a custom method in the XO-1.5 DSDT.
39 */
40static int set_lid_wake_behavior(bool wake_on_close)
41{
42 struct acpi_object_list arg_list;
43 union acpi_object arg;
44 acpi_status status;
45
46 arg_list.count = 1;
47 arg_list.pointer = &arg;
48 arg.type = ACPI_TYPE_INTEGER;
49 arg.integer.value = wake_on_close;
50
51 status = acpi_evaluate_object(NULL, "\\_SB.PCI0.LID.LIDW", &arg_list, NULL);
52 if (ACPI_FAILURE(status)) {
53 pr_warning(PFX "failed to set lid behavior\n");
54 return 1;
55 }
56
57 lid_wake_on_close = wake_on_close;
58
59 return 0;
60}
61
62static ssize_t
63lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
64{
65 return sprintf(buf, "%u\n", lid_wake_on_close);
66}
67
68static ssize_t lid_wake_on_close_store(struct kobject *s,
69 struct kobj_attribute *attr,
70 const char *buf, size_t n)
71{
72 unsigned int val;
73
74 if (sscanf(buf, "%u", &val) != 1)
75 return -EINVAL;
76
77 set_lid_wake_behavior(!!val);
78
79 return n;
80}
81
82static struct kobj_attribute lid_wake_on_close_attr =
83 __ATTR(lid_wake_on_close, 0644,
84 lid_wake_on_close_show,
85 lid_wake_on_close_store);
86
87static void battery_status_changed(void)
88{
89 struct power_supply *psy = power_supply_get_by_name("olpc-battery");
90
91 if (psy) {
92 power_supply_changed(psy);
93 put_device(psy->dev);
94 }
95}
96
97static void ac_status_changed(void)
98{
99 struct power_supply *psy = power_supply_get_by_name("olpc-ac");
100
101 if (psy) {
102 power_supply_changed(psy);
103 put_device(psy->dev);
104 }
105}
106
107static void process_sci_queue(void)
108{
109 u16 data;
110 int r;
111
112 do {
113 r = olpc_ec_sci_query(&data);
114 if (r || !data)
115 break;
116
117 pr_debug(PFX "SCI 0x%x received\n", data);
118
119 switch (data) {
120 case EC_SCI_SRC_BATERR:
121 case EC_SCI_SRC_BATSOC:
122 case EC_SCI_SRC_BATTERY:
123 case EC_SCI_SRC_BATCRIT:
124 battery_status_changed();
125 break;
126 case EC_SCI_SRC_ACPWR:
127 ac_status_changed();
128 break;
129 }
130 } while (data);
131
132 if (r)
133 pr_err(PFX "Failed to clear SCI queue");
134}
135
136static void process_sci_queue_work(struct work_struct *work)
137{
138 process_sci_queue();
139}
140
141static DECLARE_WORK(sci_work, process_sci_queue_work);
142
143static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
144{
145 schedule_work(&sci_work);
146 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
147}
148
149static int xo15_sci_add(struct acpi_device *device)
150{
151 unsigned long long tmp;
152 acpi_status status;
153 int r;
154
155 if (!device)
156 return -EINVAL;
157
158 strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
159 strcpy(acpi_device_class(device), XO15_SCI_CLASS);
160
161 /* Get GPE bit assignment (EC events). */
162 status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
163 if (ACPI_FAILURE(status))
164 return -EINVAL;
165
166 xo15_sci_gpe = tmp;
167 status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
168 ACPI_GPE_EDGE_TRIGGERED,
169 xo15_sci_gpe_handler, device);
170 if (ACPI_FAILURE(status))
171 return -ENODEV;
172
173 dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
174
175 r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
176 if (r)
177 goto err_sysfs;
178
179 /* Flush queue, and enable all SCI events */
180 process_sci_queue();
181 olpc_ec_mask_write(EC_SCI_SRC_ALL);
182
183 acpi_enable_gpe(NULL, xo15_sci_gpe);
184
185 /* Enable wake-on-EC */
186 if (device->wakeup.flags.valid)
187 device_init_wakeup(&device->dev, true);
188
189 return 0;
190
191err_sysfs:
192 acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
193 cancel_work_sync(&sci_work);
194 return r;
195}
196
197static int xo15_sci_remove(struct acpi_device *device, int type)
198{
199 acpi_disable_gpe(NULL, xo15_sci_gpe);
200 acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
201 cancel_work_sync(&sci_work);
202 sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
203 return 0;
204}
205
206static int xo15_sci_resume(struct acpi_device *device)
207{
208 /* Enable all EC events */
209 olpc_ec_mask_write(EC_SCI_SRC_ALL);
210
211 /* Power/battery status might have changed */
212 battery_status_changed();
213 ac_status_changed();
214
215 return 0;
216}
217
218static const struct acpi_device_id xo15_sci_device_ids[] = {
219 {"XO15EC", 0},
220 {"", 0},
221};
222
223static struct acpi_driver xo15_sci_drv = {
224 .name = DRV_NAME,
225 .class = XO15_SCI_CLASS,
226 .ids = xo15_sci_device_ids,
227 .ops = {
228 .add = xo15_sci_add,
229 .remove = xo15_sci_remove,
230 .resume = xo15_sci_resume,
231 },
232};
233
234static int __init xo15_sci_init(void)
235{
236 return acpi_bus_register_driver(&xo15_sci_drv);
237}
238device_initcall(xo15_sci_init);
1/*
2 * Support for OLPC XO-1.5 System Control Interrupts (SCI)
3 *
4 * Copyright (C) 2009-2010 One Laptop per Child
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/device.h>
13#include <linux/slab.h>
14#include <linux/workqueue.h>
15#include <linux/power_supply.h>
16
17#include <acpi/acpi_bus.h>
18#include <acpi/acpi_drivers.h>
19#include <asm/olpc.h>
20
21#define DRV_NAME "olpc-xo15-sci"
22#define PFX DRV_NAME ": "
23#define XO15_SCI_CLASS DRV_NAME
24#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
25
26static unsigned long xo15_sci_gpe;
27
28static void battery_status_changed(void)
29{
30 struct power_supply *psy = power_supply_get_by_name("olpc-battery");
31
32 if (psy) {
33 power_supply_changed(psy);
34 put_device(psy->dev);
35 }
36}
37
38static void ac_status_changed(void)
39{
40 struct power_supply *psy = power_supply_get_by_name("olpc-ac");
41
42 if (psy) {
43 power_supply_changed(psy);
44 put_device(psy->dev);
45 }
46}
47
48static void process_sci_queue(void)
49{
50 u16 data;
51 int r;
52
53 do {
54 r = olpc_ec_sci_query(&data);
55 if (r || !data)
56 break;
57
58 pr_debug(PFX "SCI 0x%x received\n", data);
59
60 switch (data) {
61 case EC_SCI_SRC_BATERR:
62 case EC_SCI_SRC_BATSOC:
63 case EC_SCI_SRC_BATTERY:
64 case EC_SCI_SRC_BATCRIT:
65 battery_status_changed();
66 break;
67 case EC_SCI_SRC_ACPWR:
68 ac_status_changed();
69 break;
70 }
71 } while (data);
72
73 if (r)
74 pr_err(PFX "Failed to clear SCI queue");
75}
76
77static void process_sci_queue_work(struct work_struct *work)
78{
79 process_sci_queue();
80}
81
82static DECLARE_WORK(sci_work, process_sci_queue_work);
83
84static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
85{
86 schedule_work(&sci_work);
87 return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
88}
89
90static int xo15_sci_add(struct acpi_device *device)
91{
92 unsigned long long tmp;
93 acpi_status status;
94
95 if (!device)
96 return -EINVAL;
97
98 strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
99 strcpy(acpi_device_class(device), XO15_SCI_CLASS);
100
101 /* Get GPE bit assignment (EC events). */
102 status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
103 if (ACPI_FAILURE(status))
104 return -EINVAL;
105
106 xo15_sci_gpe = tmp;
107 status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
108 ACPI_GPE_EDGE_TRIGGERED,
109 xo15_sci_gpe_handler, device);
110 if (ACPI_FAILURE(status))
111 return -ENODEV;
112
113 dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
114
115 /* Flush queue, and enable all SCI events */
116 process_sci_queue();
117 olpc_ec_mask_write(EC_SCI_SRC_ALL);
118
119 acpi_enable_gpe(NULL, xo15_sci_gpe);
120
121 /* Enable wake-on-EC */
122 if (device->wakeup.flags.valid)
123 device_init_wakeup(&device->dev, true);
124
125 return 0;
126}
127
128static int xo15_sci_remove(struct acpi_device *device, int type)
129{
130 acpi_disable_gpe(NULL, xo15_sci_gpe);
131 acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
132 cancel_work_sync(&sci_work);
133 return 0;
134}
135
136static int xo15_sci_resume(struct acpi_device *device)
137{
138 /* Enable all EC events */
139 olpc_ec_mask_write(EC_SCI_SRC_ALL);
140
141 /* Power/battery status might have changed */
142 battery_status_changed();
143 ac_status_changed();
144
145 return 0;
146}
147
148static const struct acpi_device_id xo15_sci_device_ids[] = {
149 {"XO15EC", 0},
150 {"", 0},
151};
152
153static struct acpi_driver xo15_sci_drv = {
154 .name = DRV_NAME,
155 .class = XO15_SCI_CLASS,
156 .ids = xo15_sci_device_ids,
157 .ops = {
158 .add = xo15_sci_add,
159 .remove = xo15_sci_remove,
160 .resume = xo15_sci_resume,
161 },
162};
163
164static int __init xo15_sci_init(void)
165{
166 return acpi_bus_register_driver(&xo15_sci_drv);
167}
168device_initcall(xo15_sci_init);