2
* Support for OLPC XO-1 System Control Interrupts (SCI)
4
* Copyright (C) 2010 One Laptop per Child
5
* Copyright (C) 2006 Red Hat, Inc.
6
* Copyright (C) 2006 Advanced Micro Devices, Inc.
8
* This program is free software; you can redistribute it and/or modify
9
* it under the terms of the GNU General Public License as published by
10
* the Free Software Foundation; either version 2 of the License, or
11
* (at your option) any later version.
14
#include <linux/cs5535.h>
15
#include <linux/device.h>
16
#include <linux/gpio.h>
17
#include <linux/input.h>
18
#include <linux/interrupt.h>
19
#include <linux/platform_device.h>
21
#include <linux/mfd/core.h>
22
#include <linux/power_supply.h>
23
#include <linux/suspend.h>
24
#include <linux/workqueue.h>
30
#define DRV_NAME "olpc-xo1-sci"
31
#define PFX DRV_NAME ": "
33
static unsigned long acpi_base;
34
static struct input_dev *power_button_idev;
35
static struct input_dev *ebook_switch_idev;
36
static struct input_dev *lid_switch_idev;
41
static bool lid_inverted;
42
static int lid_wake_mode;
50
static const char * const lid_wake_mode_names[] = {
51
[LID_WAKE_ALWAYS] = "always",
52
[LID_WAKE_OPEN] = "open",
53
[LID_WAKE_CLOSE] = "close",
56
static void battery_status_changed(void)
58
struct power_supply *psy = power_supply_get_by_name("olpc-battery");
61
power_supply_changed(psy);
66
static void ac_status_changed(void)
68
struct power_supply *psy = power_supply_get_by_name("olpc-ac");
71
power_supply_changed(psy);
76
/* Report current ebook switch state through input layer */
77
static void send_ebook_state(void)
81
if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) {
82
pr_err(PFX "failed to get ebook state\n");
86
input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
87
input_sync(ebook_switch_idev);
90
static void flip_lid_inverter(void)
92
/* gpio is high; invert so we'll get l->h event interrupt */
94
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
96
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
97
lid_inverted = !lid_inverted;
100
static void detect_lid_state(void)
103
* the edge detector hookup on the gpio inputs on the geode is
104
* odd, to say the least. See http://dev.laptop.org/ticket/5703
105
* for details, but in a nutshell: we don't use the edge
106
* detectors. instead, we make use of an anomoly: with the both
107
* edge detectors turned off, we still get an edge event on a
108
* positive edge transition. to take advantage of this, we use the
109
* front-end inverter to ensure that that's the edge we're always
115
state = cs5535_gpio_isset(OLPC_GPIO_LID, GPIO_READ_BACK);
116
lid_open = !state ^ !lid_inverted; /* x ^^ y */
123
/* Report current lid switch state through input layer */
124
static void send_lid_state(void)
126
input_report_switch(lid_switch_idev, SW_LID, !lid_open);
127
input_sync(lid_switch_idev);
130
static ssize_t lid_wake_mode_show(struct device *dev,
131
struct device_attribute *attr, char *buf)
133
const char *mode = lid_wake_mode_names[lid_wake_mode];
134
return sprintf(buf, "%s\n", mode);
136
static ssize_t lid_wake_mode_set(struct device *dev,
137
struct device_attribute *attr,
138
const char *buf, size_t count)
141
for (i = 0; i < ARRAY_SIZE(lid_wake_mode_names); i++) {
142
const char *mode = lid_wake_mode_names[i];
143
if (strlen(mode) != count || strncasecmp(mode, buf, count))
151
static DEVICE_ATTR(lid_wake_mode, S_IWUSR | S_IRUGO, lid_wake_mode_show,
155
* Process all items in the EC's SCI queue.
157
* This is handled in a workqueue because olpc_ec_cmd can be slow (and
160
* If propagate_events is false, the queue is drained without events being
161
* generated for the interrupts.
163
static void process_sci_queue(bool propagate_events)
169
r = olpc_ec_sci_query(&data);
173
pr_debug(PFX "SCI 0x%x received\n", data);
176
case EC_SCI_SRC_BATERR:
177
case EC_SCI_SRC_BATSOC:
178
case EC_SCI_SRC_BATTERY:
179
case EC_SCI_SRC_BATCRIT:
180
battery_status_changed();
182
case EC_SCI_SRC_ACPWR:
187
if (data == EC_SCI_SRC_EBOOK && propagate_events)
192
pr_err(PFX "Failed to clear SCI queue");
195
static void process_sci_queue_work(struct work_struct *work)
197
process_sci_queue(true);
200
static DECLARE_WORK(sci_work, process_sci_queue_work);
202
static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
204
struct platform_device *pdev = dev_id;
208
sts = inl(acpi_base + CS5536_PM1_STS);
209
outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
211
gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
212
outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
214
dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
216
if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
217
input_report_key(power_button_idev, KEY_POWER, 1);
218
input_sync(power_button_idev);
219
input_report_key(power_button_idev, KEY_POWER, 0);
220
input_sync(power_button_idev);
223
if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */
224
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
225
schedule_work(&sci_work);
228
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
229
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
236
static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
238
if (device_may_wakeup(&power_button_idev->dev))
239
olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
241
olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
243
if (device_may_wakeup(&ebook_switch_idev->dev))
244
olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK);
246
olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK);
248
if (!device_may_wakeup(&lid_switch_idev->dev)) {
249
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
250
} else if ((lid_open && lid_wake_mode == LID_WAKE_OPEN) ||
251
(!lid_open && lid_wake_mode == LID_WAKE_CLOSE)) {
254
/* we may have just caused an event */
255
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
256
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
258
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
264
static int xo1_sci_resume(struct platform_device *pdev)
267
* We don't know what may have happened while we were asleep.
268
* Reestablish our lid setup so we're sure to catch all transitions.
272
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
274
/* Enable all EC events */
275
olpc_ec_mask_write(EC_SCI_SRC_ALL);
277
/* Power/battery status might have changed too */
278
battery_status_changed();
283
static int __devinit setup_sci_interrupt(struct platform_device *pdev)
289
rdmsr(0x51400020, lo, hi);
290
sci_irq = (lo >> 20) & 15;
293
dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
295
/* Zero means masked */
296
dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
299
wrmsrl(0x51400020, lo);
302
/* Select level triggered in PIC */
304
lo = inb(CS5536_PIC_INT_SEL1);
306
outb(lo, CS5536_PIC_INT_SEL1);
308
lo = inb(CS5536_PIC_INT_SEL2);
309
lo |= 1 << (sci_irq - 8);
310
outb(lo, CS5536_PIC_INT_SEL2);
313
/* Enable SCI from power button, and clear pending interrupts */
314
sts = inl(acpi_base + CS5536_PM1_STS);
315
outl((CS5536_PM_PWRBTN << 16) | 0xffff, acpi_base + CS5536_PM1_STS);
317
r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
319
dev_err(&pdev->dev, "can't request interrupt\n");
324
static int __devinit setup_ec_sci(void)
328
r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI");
332
gpio_direction_input(OLPC_GPIO_ECSCI);
334
/* Clear pending EC SCI events */
335
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
336
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS);
339
* Enable EC SCI events, and map them to both a PME and the SCI
342
* Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can
343
* be mapped to regular interrupts *or* Geode-specific Power
344
* Management Events (PMEs) - events that bring the system out of
345
* suspend. In this case, we want both of those things - the system
346
* wakeup, *and* the ability to get an interrupt when an event occurs.
348
* To achieve this, we map the GPIO to a PME, and then we use one
349
* of the many generic knobs on the CS5535 PIC to additionally map the
350
* PME to the regular SCI interrupt line.
352
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE);
354
/* Set the SCI to cause a PME event on group 7 */
355
cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1);
357
/* And have group 7 also fire the SCI interrupt */
358
cs5535_pic_unreqz_select_high(7, sci_irq);
363
static void free_ec_sci(void)
365
gpio_free(OLPC_GPIO_ECSCI);
368
static int __devinit setup_lid_events(void)
372
r = gpio_request(OLPC_GPIO_LID, "OLPC-LID");
376
gpio_direction_input(OLPC_GPIO_LID);
378
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
381
/* Clear edge detection and event enable for now */
382
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
383
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_EN);
384
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_EN);
385
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
386
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
388
/* Set the LID to cause an PME event on group 6 */
389
cs5535_gpio_setup_event(OLPC_GPIO_LID, 6, 1);
391
/* Set PME group 6 to fire the SCI interrupt */
392
cs5535_gpio_set_irq(6, sci_irq);
394
/* Enable the event */
395
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
400
static void free_lid_events(void)
402
gpio_free(OLPC_GPIO_LID);
405
static int __devinit setup_power_button(struct platform_device *pdev)
409
power_button_idev = input_allocate_device();
410
if (!power_button_idev)
413
power_button_idev->name = "Power Button";
414
power_button_idev->phys = DRV_NAME "/input0";
415
set_bit(EV_KEY, power_button_idev->evbit);
416
set_bit(KEY_POWER, power_button_idev->keybit);
418
power_button_idev->dev.parent = &pdev->dev;
419
device_init_wakeup(&power_button_idev->dev, 1);
421
r = input_register_device(power_button_idev);
423
dev_err(&pdev->dev, "failed to register power button: %d\n", r);
424
input_free_device(power_button_idev);
430
static void free_power_button(void)
432
input_unregister_device(power_button_idev);
433
input_free_device(power_button_idev);
436
static int __devinit setup_ebook_switch(struct platform_device *pdev)
440
ebook_switch_idev = input_allocate_device();
441
if (!ebook_switch_idev)
444
ebook_switch_idev->name = "EBook Switch";
445
ebook_switch_idev->phys = DRV_NAME "/input1";
446
set_bit(EV_SW, ebook_switch_idev->evbit);
447
set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit);
449
ebook_switch_idev->dev.parent = &pdev->dev;
450
device_set_wakeup_capable(&ebook_switch_idev->dev, true);
452
r = input_register_device(ebook_switch_idev);
454
dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r);
455
input_free_device(ebook_switch_idev);
461
static void free_ebook_switch(void)
463
input_unregister_device(ebook_switch_idev);
464
input_free_device(ebook_switch_idev);
467
static int __devinit setup_lid_switch(struct platform_device *pdev)
471
lid_switch_idev = input_allocate_device();
472
if (!lid_switch_idev)
475
lid_switch_idev->name = "Lid Switch";
476
lid_switch_idev->phys = DRV_NAME "/input2";
477
set_bit(EV_SW, lid_switch_idev->evbit);
478
set_bit(SW_LID, lid_switch_idev->swbit);
480
lid_switch_idev->dev.parent = &pdev->dev;
481
device_set_wakeup_capable(&lid_switch_idev->dev, true);
483
r = input_register_device(lid_switch_idev);
485
dev_err(&pdev->dev, "failed to register lid switch: %d\n", r);
489
r = device_create_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
491
dev_err(&pdev->dev, "failed to create wake mode attr: %d\n", r);
492
goto err_create_attr;
498
input_unregister_device(lid_switch_idev);
500
input_free_device(lid_switch_idev);
504
static void free_lid_switch(void)
506
device_remove_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
507
input_unregister_device(lid_switch_idev);
508
input_free_device(lid_switch_idev);
511
static int __devinit xo1_sci_probe(struct platform_device *pdev)
513
struct resource *res;
516
/* don't run on non-XOs */
517
if (!machine_is_olpc())
520
r = mfd_cell_enable(pdev);
524
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
526
dev_err(&pdev->dev, "can't fetch device resource info\n");
529
acpi_base = res->start;
531
r = setup_power_button(pdev);
535
r = setup_ebook_switch(pdev);
539
r = setup_lid_switch(pdev);
543
r = setup_lid_events();
551
/* Enable PME generation for EC-generated events */
552
outl(CS5536_GPIOM6_PME_EN | CS5536_GPIOM7_PME_EN,
553
acpi_base + CS5536_PM_GPE0_EN);
555
/* Clear pending events */
556
outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
557
process_sci_queue(false);
564
r = setup_sci_interrupt(pdev);
568
/* Enable all EC events */
569
olpc_ec_mask_write(EC_SCI_SRC_ALL);
586
static int __devexit xo1_sci_remove(struct platform_device *pdev)
588
mfd_cell_disable(pdev);
589
free_irq(sci_irq, pdev);
590
cancel_work_sync(&sci_work);
600
static struct platform_driver xo1_sci_driver = {
602
.name = "olpc-xo1-sci-acpi",
604
.probe = xo1_sci_probe,
605
.remove = __devexit_p(xo1_sci_remove),
606
.suspend = xo1_sci_suspend,
607
.resume = xo1_sci_resume,
610
static int __init xo1_sci_init(void)
612
return platform_driver_register(&xo1_sci_driver);
614
arch_initcall(xo1_sci_init);