/*
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* Support for OLPC XO-1 System Control Interrupts (SCI)
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*
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* Copyright (C) 2010 One Laptop per Child
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* Copyright (C) 2006 Red Hat, Inc.
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* Copyright (C) 2006 Advanced Micro Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/cs5535.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/pm_wakeup.h>
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#include <linux/mfd/core.h>
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#include <linux/power_supply.h>
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#include <linux/suspend.h>
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#include <linux/workqueue.h>
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#include <linux/olpc-ec.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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#include <asm/olpc.h>
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#define DRV_NAME "olpc-xo1-sci"
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#define PFX DRV_NAME ": "
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static unsigned long acpi_base;
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static struct input_dev *power_button_idev;
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static struct input_dev *ebook_switch_idev;
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static struct input_dev *lid_switch_idev;
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static int sci_irq;
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static bool lid_open;
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static bool lid_inverted;
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static int lid_wake_mode;
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enum lid_wake_modes {
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LID_WAKE_ALWAYS,
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LID_WAKE_OPEN,
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LID_WAKE_CLOSE,
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};
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static const char * const lid_wake_mode_names[] = {
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[LID_WAKE_ALWAYS] = "always",
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[LID_WAKE_OPEN] = "open",
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[LID_WAKE_CLOSE] = "close",
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};
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static void battery_status_changed(void)
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{
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struct power_supply *psy = power_supply_get_by_name("olpc-battery");
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if (psy) {
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power_supply_changed(psy);
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power_supply_put(psy);
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}
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}
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static void ac_status_changed(void)
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{
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struct power_supply *psy = power_supply_get_by_name("olpc-ac");
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if (psy) {
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power_supply_changed(psy);
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power_supply_put(psy);
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}
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}
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/* Report current ebook switch state through input layer */
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static void send_ebook_state(void)
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{
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unsigned char state;
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if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) {
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pr_err(PFX "failed to get ebook state\n");
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return;
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}
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if (!!test_bit(SW_TABLET_MODE, ebook_switch_idev->sw) == state)
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return; /* Nothing new to report. */
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input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
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input_sync(ebook_switch_idev);
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pm_wakeup_event(&ebook_switch_idev->dev, 0);
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}
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static void flip_lid_inverter(void)
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{
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/* gpio is high; invert so we'll get l->h event interrupt */
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if (lid_inverted)
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
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else
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
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lid_inverted = !lid_inverted;
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}
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static void detect_lid_state(void)
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{
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/*
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* the edge detector hookup on the gpio inputs on the geode is
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* odd, to say the least. See http://dev.laptop.org/ticket/5703
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* for details, but in a nutshell: we don't use the edge
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* detectors. instead, we make use of an anomoly: with the both
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* edge detectors turned off, we still get an edge event on a
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* positive edge transition. to take advantage of this, we use the
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* front-end inverter to ensure that that's the edge we're always
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* going to see next.
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*/
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int state;
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state = cs5535_gpio_isset(OLPC_GPIO_LID, GPIO_READ_BACK);
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lid_open = !state ^ !lid_inverted; /* x ^^ y */
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if (!state)
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return;
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flip_lid_inverter();
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}
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/* Report current lid switch state through input layer */
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static void send_lid_state(void)
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{
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if (!!test_bit(SW_LID, lid_switch_idev->sw) == !lid_open)
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return; /* Nothing new to report. */
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input_report_switch(lid_switch_idev, SW_LID, !lid_open);
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input_sync(lid_switch_idev);
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pm_wakeup_event(&lid_switch_idev->dev, 0);
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}
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static ssize_t lid_wake_mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const char *mode = lid_wake_mode_names[lid_wake_mode];
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return sprintf(buf, "%s\n", mode);
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}
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static ssize_t lid_wake_mode_set(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(lid_wake_mode_names); i++) {
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const char *mode = lid_wake_mode_names[i];
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if (strlen(mode) != count || strncasecmp(mode, buf, count))
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continue;
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lid_wake_mode = i;
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return count;
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}
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return -EINVAL;
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}
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static DEVICE_ATTR(lid_wake_mode, S_IWUSR | S_IRUGO, lid_wake_mode_show,
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lid_wake_mode_set);
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/*
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* Process all items in the EC's SCI queue.
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*
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* This is handled in a workqueue because olpc_ec_cmd can be slow (and
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* can even timeout).
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*
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* If propagate_events is false, the queue is drained without events being
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* generated for the interrupts.
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*/
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static void process_sci_queue(bool propagate_events)
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{
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int r;
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u16 data;
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do {
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r = olpc_ec_sci_query(&data);
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if (r || !data)
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break;
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pr_debug(PFX "SCI 0x%x received\n", data);
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switch (data) {
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case EC_SCI_SRC_BATERR:
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case EC_SCI_SRC_BATSOC:
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case EC_SCI_SRC_BATTERY:
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case EC_SCI_SRC_BATCRIT:
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battery_status_changed();
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break;
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case EC_SCI_SRC_ACPWR:
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ac_status_changed();
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break;
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}
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if (data == EC_SCI_SRC_EBOOK && propagate_events)
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send_ebook_state();
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} while (data);
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if (r)
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pr_err(PFX "Failed to clear SCI queue");
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}
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static void process_sci_queue_work(struct work_struct *work)
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{
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process_sci_queue(true);
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}
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static DECLARE_WORK(sci_work, process_sci_queue_work);
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static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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u32 sts;
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u32 gpe;
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sts = inl(acpi_base + CS5536_PM1_STS);
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outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
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gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
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outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
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dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
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if (sts & CS5536_PWRBTN_FLAG) {
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if (!(sts & CS5536_WAK_FLAG)) {
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/* Only report power button input when it was pressed
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* during regular operation (as opposed to when it
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* was used to wake the system). */
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input_report_key(power_button_idev, KEY_POWER, 1);
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input_sync(power_button_idev);
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input_report_key(power_button_idev, KEY_POWER, 0);
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input_sync(power_button_idev);
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}
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/* Report the wakeup event in all cases. */
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pm_wakeup_event(&power_button_idev->dev, 0);
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}
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if ((sts & (CS5536_RTC_FLAG | CS5536_WAK_FLAG)) ==
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(CS5536_RTC_FLAG | CS5536_WAK_FLAG)) {
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/* When the system is woken by the RTC alarm, report the
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* event on the rtc device. */
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struct device *rtc = bus_find_device_by_name(
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&platform_bus_type, NULL, "rtc_cmos");
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if (rtc) {
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pm_wakeup_event(rtc, 0);
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put_device(rtc);
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}
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}
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if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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schedule_work(&sci_work);
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}
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
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detect_lid_state();
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send_lid_state();
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return IRQ_HANDLED;
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}
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static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
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{
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if (device_may_wakeup(&power_button_idev->dev))
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olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
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else
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olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
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if (device_may_wakeup(&ebook_switch_idev->dev))
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olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK);
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else
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olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK);
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if (!device_may_wakeup(&lid_switch_idev->dev)) {
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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} else if ((lid_open && lid_wake_mode == LID_WAKE_OPEN) ||
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(!lid_open && lid_wake_mode == LID_WAKE_CLOSE)) {
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flip_lid_inverter();
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/* we may have just caused an event */
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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}
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return 0;
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}
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static int xo1_sci_resume(struct platform_device *pdev)
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{
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/*
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* We don't know what may have happened while we were asleep.
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* Reestablish our lid setup so we're sure to catch all transitions.
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*/
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detect_lid_state();
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send_lid_state();
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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/* Power/battery status might have changed too */
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battery_status_changed();
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ac_status_changed();
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return 0;
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}
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static int setup_sci_interrupt(struct platform_device *pdev)
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{
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u32 lo, hi;
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u32 sts;
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int r;
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rdmsr(0x51400020, lo, hi);
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sci_irq = (lo >> 20) & 15;
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if (sci_irq) {
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dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
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} else {
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/* Zero means masked */
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dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
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sci_irq = 3;
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lo |= 0x00300000;
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wrmsrl(0x51400020, lo);
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}
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/* Select level triggered in PIC */
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if (sci_irq < 8) {
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lo = inb(CS5536_PIC_INT_SEL1);
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lo |= 1 << sci_irq;
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outb(lo, CS5536_PIC_INT_SEL1);
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} else {
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lo = inb(CS5536_PIC_INT_SEL2);
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lo |= 1 << (sci_irq - 8);
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outb(lo, CS5536_PIC_INT_SEL2);
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}
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/* Enable interesting SCI events, and clear pending interrupts */
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sts = inl(acpi_base + CS5536_PM1_STS);
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outl(((CS5536_PM_PWRBTN | CS5536_PM_RTC) << 16) | 0xffff,
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acpi_base + CS5536_PM1_STS);
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r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
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if (r)
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dev_err(&pdev->dev, "can't request interrupt\n");
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return r;
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}
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static int setup_ec_sci(void)
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{
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int r;
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r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI");
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if (r)
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return r;
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gpio_direction_input(OLPC_GPIO_ECSCI);
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/* Clear pending EC SCI events */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS);
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/*
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* Enable EC SCI events, and map them to both a PME and the SCI
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* interrupt.
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*
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* Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can
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* be mapped to regular interrupts *or* Geode-specific Power
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* Management Events (PMEs) - events that bring the system out of
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* suspend. In this case, we want both of those things - the system
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* wakeup, *and* the ability to get an interrupt when an event occurs.
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*
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* To achieve this, we map the GPIO to a PME, and then we use one
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* of the many generic knobs on the CS5535 PIC to additionally map the
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* PME to the regular SCI interrupt line.
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*/
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE);
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/* Set the SCI to cause a PME event on group 7 */
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cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1);
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/* And have group 7 also fire the SCI interrupt */
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cs5535_pic_unreqz_select_high(7, sci_irq);
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return 0;
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}
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static void free_ec_sci(void)
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{
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gpio_free(OLPC_GPIO_ECSCI);
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}
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static int setup_lid_events(void)
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{
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int r;
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r = gpio_request(OLPC_GPIO_LID, "OLPC-LID");
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if (r)
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return r;
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gpio_direction_input(OLPC_GPIO_LID);
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
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lid_inverted = 0;
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/* Clear edge detection and event enable for now */
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_EN);
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cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_EN);
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
|
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/* Set the LID to cause an PME event on group 6 */
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cs5535_gpio_setup_event(OLPC_GPIO_LID, 6, 1);
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/* Set PME group 6 to fire the SCI interrupt */
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cs5535_gpio_set_irq(6, sci_irq);
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/* Enable the event */
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cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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return 0;
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}
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static void free_lid_events(void)
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{
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gpio_free(OLPC_GPIO_LID);
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}
|
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static int setup_power_button(struct platform_device *pdev)
|
{
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int r;
|
|
power_button_idev = input_allocate_device();
|
if (!power_button_idev)
|
return -ENOMEM;
|
|
power_button_idev->name = "Power Button";
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power_button_idev->phys = DRV_NAME "/input0";
|
set_bit(EV_KEY, power_button_idev->evbit);
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set_bit(KEY_POWER, power_button_idev->keybit);
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|
power_button_idev->dev.parent = &pdev->dev;
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device_init_wakeup(&power_button_idev->dev, 1);
|
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r = input_register_device(power_button_idev);
|
if (r) {
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dev_err(&pdev->dev, "failed to register power button: %d\n", r);
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input_free_device(power_button_idev);
|
}
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return r;
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}
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static void free_power_button(void)
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{
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input_unregister_device(power_button_idev);
|
}
|
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static int setup_ebook_switch(struct platform_device *pdev)
|
{
|
int r;
|
|
ebook_switch_idev = input_allocate_device();
|
if (!ebook_switch_idev)
|
return -ENOMEM;
|
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ebook_switch_idev->name = "EBook Switch";
|
ebook_switch_idev->phys = DRV_NAME "/input1";
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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;
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}
|
|
static void free_ebook_switch(void)
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{
|
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);
|
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r = input_register_device(lid_switch_idev);
|
if (r) {
|
dev_err(&pdev->dev, "failed to register lid switch: %d\n", r);
|
goto err_register;
|
}
|
|
r = device_create_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
|
if (r) {
|
dev_err(&pdev->dev, "failed to create wake mode attr: %d\n", r);
|
goto err_create_attr;
|
}
|
|
return 0;
|
|
err_create_attr:
|
input_unregister_device(lid_switch_idev);
|
lid_switch_idev = NULL;
|
err_register:
|
input_free_device(lid_switch_idev);
|
return r;
|
}
|
|
static void free_lid_switch(void)
|
{
|
device_remove_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
|
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;
|
|
r = mfd_cell_enable(pdev);
|
if (r)
|
return r;
|
|
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)
|
{
|
mfd_cell_disable(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",
|
},
|
.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);
|
