mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
629 lines
15 KiB
629 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Support for OLPC XO-1 System Control Interrupts (SCI) |
|
* |
|
* Copyright (C) 2010 One Laptop per Child |
|
* Copyright (C) 2006 Red Hat, Inc. |
|
* Copyright (C) 2006 Advanced Micro Devices, Inc. |
|
*/ |
|
|
|
#include <linux/cs5535.h> |
|
#include <linux/device.h> |
|
#include <linux/gpio.h> |
|
#include <linux/input.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/pm.h> |
|
#include <linux/pm_wakeup.h> |
|
#include <linux/power_supply.h> |
|
#include <linux/suspend.h> |
|
#include <linux/workqueue.h> |
|
#include <linux/olpc-ec.h> |
|
|
|
#include <asm/io.h> |
|
#include <asm/msr.h> |
|
#include <asm/olpc.h> |
|
|
|
#define DRV_NAME "olpc-xo1-sci" |
|
#define PFX DRV_NAME ": " |
|
|
|
static unsigned long acpi_base; |
|
static struct input_dev *power_button_idev; |
|
static struct input_dev *ebook_switch_idev; |
|
static struct input_dev *lid_switch_idev; |
|
|
|
static int sci_irq; |
|
|
|
static bool lid_open; |
|
static bool lid_inverted; |
|
static int lid_wake_mode; |
|
|
|
enum lid_wake_modes { |
|
LID_WAKE_ALWAYS, |
|
LID_WAKE_OPEN, |
|
LID_WAKE_CLOSE, |
|
}; |
|
|
|
static const char * const lid_wake_mode_names[] = { |
|
[LID_WAKE_ALWAYS] = "always", |
|
[LID_WAKE_OPEN] = "open", |
|
[LID_WAKE_CLOSE] = "close", |
|
}; |
|
|
|
static void battery_status_changed(void) |
|
{ |
|
struct power_supply *psy = power_supply_get_by_name("olpc_battery"); |
|
|
|
if (psy) { |
|
power_supply_changed(psy); |
|
power_supply_put(psy); |
|
} |
|
} |
|
|
|
static void ac_status_changed(void) |
|
{ |
|
struct power_supply *psy = power_supply_get_by_name("olpc_ac"); |
|
|
|
if (psy) { |
|
power_supply_changed(psy); |
|
power_supply_put(psy); |
|
} |
|
} |
|
|
|
/* Report current ebook switch state through input layer */ |
|
static void send_ebook_state(void) |
|
{ |
|
unsigned char state; |
|
|
|
if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) { |
|
pr_err(PFX "failed to get ebook state\n"); |
|
return; |
|
} |
|
|
|
if (!!test_bit(SW_TABLET_MODE, ebook_switch_idev->sw) == state) |
|
return; /* Nothing new to report. */ |
|
|
|
input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state); |
|
input_sync(ebook_switch_idev); |
|
pm_wakeup_event(&ebook_switch_idev->dev, 0); |
|
} |
|
|
|
static void flip_lid_inverter(void) |
|
{ |
|
/* gpio is high; invert so we'll get l->h event interrupt */ |
|
if (lid_inverted) |
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT); |
|
else |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_INPUT_INVERT); |
|
lid_inverted = !lid_inverted; |
|
} |
|
|
|
static void detect_lid_state(void) |
|
{ |
|
/* |
|
* the edge detector hookup on the gpio inputs on the geode is |
|
* odd, to say the least. See http://dev.laptop.org/ticket/5703 |
|
* for details, but in a nutshell: we don't use the edge |
|
* detectors. instead, we make use of an anomaly: with the both |
|
* edge detectors turned off, we still get an edge event on a |
|
* positive edge transition. to take advantage of this, we use the |
|
* front-end inverter to ensure that that's the edge we're always |
|
* going to see next. |
|
*/ |
|
|
|
int state; |
|
|
|
state = cs5535_gpio_isset(OLPC_GPIO_LID, GPIO_READ_BACK); |
|
lid_open = !state ^ !lid_inverted; /* x ^^ y */ |
|
if (!state) |
|
return; |
|
|
|
flip_lid_inverter(); |
|
} |
|
|
|
/* Report current lid switch state through input layer */ |
|
static void send_lid_state(void) |
|
{ |
|
if (!!test_bit(SW_LID, lid_switch_idev->sw) == !lid_open) |
|
return; /* Nothing new to report. */ |
|
|
|
input_report_switch(lid_switch_idev, SW_LID, !lid_open); |
|
input_sync(lid_switch_idev); |
|
pm_wakeup_event(&lid_switch_idev->dev, 0); |
|
} |
|
|
|
static ssize_t lid_wake_mode_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
const char *mode = lid_wake_mode_names[lid_wake_mode]; |
|
return sprintf(buf, "%s\n", mode); |
|
} |
|
static ssize_t lid_wake_mode_set(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
int i; |
|
for (i = 0; i < ARRAY_SIZE(lid_wake_mode_names); i++) { |
|
const char *mode = lid_wake_mode_names[i]; |
|
if (strlen(mode) != count || strncasecmp(mode, buf, count)) |
|
continue; |
|
|
|
lid_wake_mode = i; |
|
return count; |
|
} |
|
return -EINVAL; |
|
} |
|
static DEVICE_ATTR(lid_wake_mode, S_IWUSR | S_IRUGO, lid_wake_mode_show, |
|
lid_wake_mode_set); |
|
|
|
static struct attribute *lid_attrs[] = { |
|
&dev_attr_lid_wake_mode.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(lid); |
|
|
|
/* |
|
* Process all items in the EC's SCI queue. |
|
* |
|
* This is handled in a workqueue because olpc_ec_cmd can be slow (and |
|
* can even timeout). |
|
* |
|
* If propagate_events is false, the queue is drained without events being |
|
* generated for the interrupts. |
|
*/ |
|
static void process_sci_queue(bool propagate_events) |
|
{ |
|
int r; |
|
u16 data; |
|
|
|
do { |
|
r = olpc_ec_sci_query(&data); |
|
if (r || !data) |
|
break; |
|
|
|
pr_debug(PFX "SCI 0x%x received\n", data); |
|
|
|
switch (data) { |
|
case EC_SCI_SRC_BATERR: |
|
case EC_SCI_SRC_BATSOC: |
|
case EC_SCI_SRC_BATTERY: |
|
case EC_SCI_SRC_BATCRIT: |
|
battery_status_changed(); |
|
break; |
|
case EC_SCI_SRC_ACPWR: |
|
ac_status_changed(); |
|
break; |
|
} |
|
|
|
if (data == EC_SCI_SRC_EBOOK && propagate_events) |
|
send_ebook_state(); |
|
} while (data); |
|
|
|
if (r) |
|
pr_err(PFX "Failed to clear SCI queue"); |
|
} |
|
|
|
static void process_sci_queue_work(struct work_struct *work) |
|
{ |
|
process_sci_queue(true); |
|
} |
|
|
|
static DECLARE_WORK(sci_work, process_sci_queue_work); |
|
|
|
static irqreturn_t xo1_sci_intr(int irq, void *dev_id) |
|
{ |
|
struct platform_device *pdev = dev_id; |
|
u32 sts; |
|
u32 gpe; |
|
|
|
sts = inl(acpi_base + CS5536_PM1_STS); |
|
outl(sts | 0xffff, acpi_base + CS5536_PM1_STS); |
|
|
|
gpe = inl(acpi_base + CS5536_PM_GPE0_STS); |
|
outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS); |
|
|
|
dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe); |
|
|
|
if (sts & CS5536_PWRBTN_FLAG) { |
|
if (!(sts & CS5536_WAK_FLAG)) { |
|
/* Only report power button input when it was pressed |
|
* during regular operation (as opposed to when it |
|
* was used to wake the system). */ |
|
input_report_key(power_button_idev, KEY_POWER, 1); |
|
input_sync(power_button_idev); |
|
input_report_key(power_button_idev, KEY_POWER, 0); |
|
input_sync(power_button_idev); |
|
} |
|
/* Report the wakeup event in all cases. */ |
|
pm_wakeup_event(&power_button_idev->dev, 0); |
|
} |
|
|
|
if ((sts & (CS5536_RTC_FLAG | CS5536_WAK_FLAG)) == |
|
(CS5536_RTC_FLAG | CS5536_WAK_FLAG)) { |
|
/* When the system is woken by the RTC alarm, report the |
|
* event on the rtc device. */ |
|
struct device *rtc = bus_find_device_by_name( |
|
&platform_bus_type, NULL, "rtc_cmos"); |
|
if (rtc) { |
|
pm_wakeup_event(rtc, 0); |
|
put_device(rtc); |
|
} |
|
} |
|
|
|
if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */ |
|
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS); |
|
schedule_work(&sci_work); |
|
} |
|
|
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS); |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS); |
|
detect_lid_state(); |
|
send_lid_state(); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state) |
|
{ |
|
if (device_may_wakeup(&power_button_idev->dev)) |
|
olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN); |
|
else |
|
olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN); |
|
|
|
if (device_may_wakeup(&ebook_switch_idev->dev)) |
|
olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK); |
|
else |
|
olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK); |
|
|
|
if (!device_may_wakeup(&lid_switch_idev->dev)) { |
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE); |
|
} else if ((lid_open && lid_wake_mode == LID_WAKE_OPEN) || |
|
(!lid_open && lid_wake_mode == LID_WAKE_CLOSE)) { |
|
flip_lid_inverter(); |
|
|
|
/* we may have just caused an event */ |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS); |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS); |
|
|
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int xo1_sci_resume(struct platform_device *pdev) |
|
{ |
|
/* |
|
* We don't know what may have happened while we were asleep. |
|
* Reestablish our lid setup so we're sure to catch all transitions. |
|
*/ |
|
detect_lid_state(); |
|
send_lid_state(); |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE); |
|
|
|
/* Enable all EC events */ |
|
olpc_ec_mask_write(EC_SCI_SRC_ALL); |
|
|
|
/* Power/battery status might have changed too */ |
|
battery_status_changed(); |
|
ac_status_changed(); |
|
return 0; |
|
} |
|
|
|
static int setup_sci_interrupt(struct platform_device *pdev) |
|
{ |
|
u32 lo, hi; |
|
u32 sts; |
|
int r; |
|
|
|
rdmsr(0x51400020, lo, hi); |
|
sci_irq = (lo >> 20) & 15; |
|
|
|
if (sci_irq) { |
|
dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq); |
|
} else { |
|
/* Zero means masked */ |
|
dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n"); |
|
sci_irq = 3; |
|
lo |= 0x00300000; |
|
wrmsrl(0x51400020, lo); |
|
} |
|
|
|
/* Select level triggered in PIC */ |
|
if (sci_irq < 8) { |
|
lo = inb(CS5536_PIC_INT_SEL1); |
|
lo |= 1 << sci_irq; |
|
outb(lo, CS5536_PIC_INT_SEL1); |
|
} else { |
|
lo = inb(CS5536_PIC_INT_SEL2); |
|
lo |= 1 << (sci_irq - 8); |
|
outb(lo, CS5536_PIC_INT_SEL2); |
|
} |
|
|
|
/* Enable interesting SCI events, and clear pending interrupts */ |
|
sts = inl(acpi_base + CS5536_PM1_STS); |
|
outl(((CS5536_PM_PWRBTN | CS5536_PM_RTC) << 16) | 0xffff, |
|
acpi_base + CS5536_PM1_STS); |
|
|
|
r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev); |
|
if (r) |
|
dev_err(&pdev->dev, "can't request interrupt\n"); |
|
|
|
return r; |
|
} |
|
|
|
static int setup_ec_sci(void) |
|
{ |
|
int r; |
|
|
|
r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI"); |
|
if (r) |
|
return r; |
|
|
|
gpio_direction_input(OLPC_GPIO_ECSCI); |
|
|
|
/* Clear pending EC SCI events */ |
|
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS); |
|
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS); |
|
|
|
/* |
|
* Enable EC SCI events, and map them to both a PME and the SCI |
|
* interrupt. |
|
* |
|
* Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can |
|
* be mapped to regular interrupts *or* Geode-specific Power |
|
* Management Events (PMEs) - events that bring the system out of |
|
* suspend. In this case, we want both of those things - the system |
|
* wakeup, *and* the ability to get an interrupt when an event occurs. |
|
* |
|
* To achieve this, we map the GPIO to a PME, and then we use one |
|
* of the many generic knobs on the CS5535 PIC to additionally map the |
|
* PME to the regular SCI interrupt line. |
|
*/ |
|
cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE); |
|
|
|
/* Set the SCI to cause a PME event on group 7 */ |
|
cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1); |
|
|
|
/* And have group 7 also fire the SCI interrupt */ |
|
cs5535_pic_unreqz_select_high(7, sci_irq); |
|
|
|
return 0; |
|
} |
|
|
|
static void free_ec_sci(void) |
|
{ |
|
gpio_free(OLPC_GPIO_ECSCI); |
|
} |
|
|
|
static int setup_lid_events(void) |
|
{ |
|
int r; |
|
|
|
r = gpio_request(OLPC_GPIO_LID, "OLPC-LID"); |
|
if (r) |
|
return r; |
|
|
|
gpio_direction_input(OLPC_GPIO_LID); |
|
|
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT); |
|
lid_inverted = 0; |
|
|
|
/* Clear edge detection and event enable for now */ |
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE); |
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_EN); |
|
cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_EN); |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS); |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS); |
|
|
|
/* Set the LID to cause an PME event on group 6 */ |
|
cs5535_gpio_setup_event(OLPC_GPIO_LID, 6, 1); |
|
|
|
/* Set PME group 6 to fire the SCI interrupt */ |
|
cs5535_gpio_set_irq(6, sci_irq); |
|
|
|
/* Enable the event */ |
|
cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE); |
|
|
|
return 0; |
|
} |
|
|
|
static void free_lid_events(void) |
|
{ |
|
gpio_free(OLPC_GPIO_LID); |
|
} |
|
|
|
static int setup_power_button(struct platform_device *pdev) |
|
{ |
|
int r; |
|
|
|
power_button_idev = input_allocate_device(); |
|
if (!power_button_idev) |
|
return -ENOMEM; |
|
|
|
power_button_idev->name = "Power Button"; |
|
power_button_idev->phys = DRV_NAME "/input0"; |
|
set_bit(EV_KEY, power_button_idev->evbit); |
|
set_bit(KEY_POWER, power_button_idev->keybit); |
|
|
|
power_button_idev->dev.parent = &pdev->dev; |
|
device_init_wakeup(&power_button_idev->dev, 1); |
|
|
|
r = input_register_device(power_button_idev); |
|
if (r) { |
|
dev_err(&pdev->dev, "failed to register power button: %d\n", r); |
|
input_free_device(power_button_idev); |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static void free_power_button(void) |
|
{ |
|
input_unregister_device(power_button_idev); |
|
} |
|
|
|
static int setup_ebook_switch(struct platform_device *pdev) |
|
{ |
|
int r; |
|
|
|
ebook_switch_idev = input_allocate_device(); |
|
if (!ebook_switch_idev) |
|
return -ENOMEM; |
|
|
|
ebook_switch_idev->name = "EBook Switch"; |
|
ebook_switch_idev->phys = DRV_NAME "/input1"; |
|
set_bit(EV_SW, ebook_switch_idev->evbit); |
|
set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit); |
|
|
|
ebook_switch_idev->dev.parent = &pdev->dev; |
|
device_set_wakeup_capable(&ebook_switch_idev->dev, true); |
|
|
|
r = input_register_device(ebook_switch_idev); |
|
if (r) { |
|
dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r); |
|
input_free_device(ebook_switch_idev); |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static void free_ebook_switch(void) |
|
{ |
|
input_unregister_device(ebook_switch_idev); |
|
} |
|
|
|
static int setup_lid_switch(struct platform_device *pdev) |
|
{ |
|
int r; |
|
|
|
lid_switch_idev = input_allocate_device(); |
|
if (!lid_switch_idev) |
|
return -ENOMEM; |
|
|
|
lid_switch_idev->name = "Lid Switch"; |
|
lid_switch_idev->phys = DRV_NAME "/input2"; |
|
set_bit(EV_SW, lid_switch_idev->evbit); |
|
set_bit(SW_LID, lid_switch_idev->swbit); |
|
|
|
lid_switch_idev->dev.parent = &pdev->dev; |
|
device_set_wakeup_capable(&lid_switch_idev->dev, true); |
|
|
|
r = input_register_device(lid_switch_idev); |
|
if (r) { |
|
dev_err(&pdev->dev, "failed to register lid switch: %d\n", r); |
|
goto err_register; |
|
} |
|
|
|
return 0; |
|
|
|
err_register: |
|
input_free_device(lid_switch_idev); |
|
return r; |
|
} |
|
|
|
static void free_lid_switch(void) |
|
{ |
|
input_unregister_device(lid_switch_idev); |
|
} |
|
|
|
static int xo1_sci_probe(struct platform_device *pdev) |
|
{ |
|
struct resource *res; |
|
int r; |
|
|
|
/* don't run on non-XOs */ |
|
if (!machine_is_olpc()) |
|
return -ENODEV; |
|
|
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
|
if (!res) { |
|
dev_err(&pdev->dev, "can't fetch device resource info\n"); |
|
return -EIO; |
|
} |
|
acpi_base = res->start; |
|
|
|
r = setup_power_button(pdev); |
|
if (r) |
|
return r; |
|
|
|
r = setup_ebook_switch(pdev); |
|
if (r) |
|
goto err_ebook; |
|
|
|
r = setup_lid_switch(pdev); |
|
if (r) |
|
goto err_lid; |
|
|
|
r = setup_lid_events(); |
|
if (r) |
|
goto err_lidevt; |
|
|
|
r = setup_ec_sci(); |
|
if (r) |
|
goto err_ecsci; |
|
|
|
/* Enable PME generation for EC-generated events */ |
|
outl(CS5536_GPIOM6_PME_EN | CS5536_GPIOM7_PME_EN, |
|
acpi_base + CS5536_PM_GPE0_EN); |
|
|
|
/* Clear pending events */ |
|
outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS); |
|
process_sci_queue(false); |
|
|
|
/* Initial sync */ |
|
send_ebook_state(); |
|
detect_lid_state(); |
|
send_lid_state(); |
|
|
|
r = setup_sci_interrupt(pdev); |
|
if (r) |
|
goto err_sci; |
|
|
|
/* Enable all EC events */ |
|
olpc_ec_mask_write(EC_SCI_SRC_ALL); |
|
|
|
return r; |
|
|
|
err_sci: |
|
free_ec_sci(); |
|
err_ecsci: |
|
free_lid_events(); |
|
err_lidevt: |
|
free_lid_switch(); |
|
err_lid: |
|
free_ebook_switch(); |
|
err_ebook: |
|
free_power_button(); |
|
return r; |
|
} |
|
|
|
static int xo1_sci_remove(struct platform_device *pdev) |
|
{ |
|
free_irq(sci_irq, pdev); |
|
cancel_work_sync(&sci_work); |
|
free_ec_sci(); |
|
free_lid_events(); |
|
free_lid_switch(); |
|
free_ebook_switch(); |
|
free_power_button(); |
|
acpi_base = 0; |
|
return 0; |
|
} |
|
|
|
static struct platform_driver xo1_sci_driver = { |
|
.driver = { |
|
.name = "olpc-xo1-sci-acpi", |
|
.dev_groups = lid_groups, |
|
}, |
|
.probe = xo1_sci_probe, |
|
.remove = xo1_sci_remove, |
|
.suspend = xo1_sci_suspend, |
|
.resume = xo1_sci_resume, |
|
}; |
|
|
|
static int __init xo1_sci_init(void) |
|
{ |
|
return platform_driver_register(&xo1_sci_driver); |
|
} |
|
arch_initcall(xo1_sci_init);
|
|
|