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Linux/arch/x86/platform/olpc/olpc-xo15-sci.c

  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 #include <linux/olpc-ec.h>
 17 
 18 #include <linux/acpi.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 
 26 static unsigned long                    xo15_sci_gpe;
 27 static 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  */
 40 static int set_lid_wake_behavior(bool wake_on_close)
 41 {
 42         acpi_status status;
 43 
 44         status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
 45         if (ACPI_FAILURE(status)) {
 46                 pr_warning(PFX "failed to set lid behavior\n");
 47                 return 1;
 48         }
 49 
 50         lid_wake_on_close = wake_on_close;
 51 
 52         return 0;
 53 }
 54 
 55 static ssize_t
 56 lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
 57 {
 58         return sprintf(buf, "%u\n", lid_wake_on_close);
 59 }
 60 
 61 static ssize_t lid_wake_on_close_store(struct kobject *s,
 62                                        struct kobj_attribute *attr,
 63                                        const char *buf, size_t n)
 64 {
 65         unsigned int val;
 66 
 67         if (sscanf(buf, "%u", &val) != 1)
 68                 return -EINVAL;
 69 
 70         set_lid_wake_behavior(!!val);
 71 
 72         return n;
 73 }
 74 
 75 static struct kobj_attribute lid_wake_on_close_attr =
 76         __ATTR(lid_wake_on_close, 0644,
 77                lid_wake_on_close_show,
 78                lid_wake_on_close_store);
 79 
 80 static void battery_status_changed(void)
 81 {
 82         struct power_supply *psy = power_supply_get_by_name("olpc-battery");
 83 
 84         if (psy) {
 85                 power_supply_changed(psy);
 86                 put_device(psy->dev);
 87         }
 88 }
 89 
 90 static void ac_status_changed(void)
 91 {
 92         struct power_supply *psy = power_supply_get_by_name("olpc-ac");
 93 
 94         if (psy) {
 95                 power_supply_changed(psy);
 96                 put_device(psy->dev);
 97         }
 98 }
 99 
100 static void process_sci_queue(void)
101 {
102         u16 data;
103         int r;
104 
105         do {
106                 r = olpc_ec_sci_query(&data);
107                 if (r || !data)
108                         break;
109 
110                 pr_debug(PFX "SCI 0x%x received\n", data);
111 
112                 switch (data) {
113                 case EC_SCI_SRC_BATERR:
114                 case EC_SCI_SRC_BATSOC:
115                 case EC_SCI_SRC_BATTERY:
116                 case EC_SCI_SRC_BATCRIT:
117                         battery_status_changed();
118                         break;
119                 case EC_SCI_SRC_ACPWR:
120                         ac_status_changed();
121                         break;
122                 }
123         } while (data);
124 
125         if (r)
126                 pr_err(PFX "Failed to clear SCI queue");
127 }
128 
129 static void process_sci_queue_work(struct work_struct *work)
130 {
131         process_sci_queue();
132 }
133 
134 static DECLARE_WORK(sci_work, process_sci_queue_work);
135 
136 static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
137 {
138         schedule_work(&sci_work);
139         return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
140 }
141 
142 static int xo15_sci_add(struct acpi_device *device)
143 {
144         unsigned long long tmp;
145         acpi_status status;
146         int r;
147 
148         if (!device)
149                 return -EINVAL;
150 
151         strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
152         strcpy(acpi_device_class(device), XO15_SCI_CLASS);
153 
154         /* Get GPE bit assignment (EC events). */
155         status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
156         if (ACPI_FAILURE(status))
157                 return -EINVAL;
158 
159         xo15_sci_gpe = tmp;
160         status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
161                                           ACPI_GPE_EDGE_TRIGGERED,
162                                           xo15_sci_gpe_handler, device);
163         if (ACPI_FAILURE(status))
164                 return -ENODEV;
165 
166         dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
167 
168         r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
169         if (r)
170                 goto err_sysfs;
171 
172         /* Flush queue, and enable all SCI events */
173         process_sci_queue();
174         olpc_ec_mask_write(EC_SCI_SRC_ALL);
175 
176         acpi_enable_gpe(NULL, xo15_sci_gpe);
177 
178         /* Enable wake-on-EC */
179         if (device->wakeup.flags.valid)
180                 device_init_wakeup(&device->dev, true);
181 
182         return 0;
183 
184 err_sysfs:
185         acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
186         cancel_work_sync(&sci_work);
187         return r;
188 }
189 
190 static int xo15_sci_remove(struct acpi_device *device)
191 {
192         acpi_disable_gpe(NULL, xo15_sci_gpe);
193         acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
194         cancel_work_sync(&sci_work);
195         sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
196         return 0;
197 }
198 
199 static int xo15_sci_resume(struct device *dev)
200 {
201         /* Enable all EC events */
202         olpc_ec_mask_write(EC_SCI_SRC_ALL);
203 
204         /* Power/battery status might have changed */
205         battery_status_changed();
206         ac_status_changed();
207 
208         return 0;
209 }
210 
211 static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
212 
213 static const struct acpi_device_id xo15_sci_device_ids[] = {
214         {"XO15EC", 0},
215         {"", 0},
216 };
217 
218 static struct acpi_driver xo15_sci_drv = {
219         .name = DRV_NAME,
220         .class = XO15_SCI_CLASS,
221         .ids = xo15_sci_device_ids,
222         .ops = {
223                 .add = xo15_sci_add,
224                 .remove = xo15_sci_remove,
225         },
226         .drv.pm = &xo15_sci_pm,
227 };
228 
229 static int __init xo15_sci_init(void)
230 {
231         return acpi_bus_register_driver(&xo15_sci_drv);
232 }
233 device_initcall(xo15_sci_init);
234 

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