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@@ -0,0 +1,614 @@
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+/*
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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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+
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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/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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+
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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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+
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+#define DRV_NAME "olpc-xo1-sci"
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+#define PFX DRV_NAME ": "
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+
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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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+
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+static int sci_irq;
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+
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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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+
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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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+
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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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+
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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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+
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+ if (psy) {
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+ power_supply_changed(psy);
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+ put_device(psy->dev);
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+ }
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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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+
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+ if (psy) {
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+ power_supply_changed(psy);
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+ put_device(psy->dev);
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+ }
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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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+
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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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+
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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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+}
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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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+
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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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+
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+ int state;
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+
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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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+
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+ flip_lid_inverter();
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+}
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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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+ input_report_switch(lid_switch_idev, SW_LID, !lid_open);
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+ input_sync(lid_switch_idev);
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+}
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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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+
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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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+/*
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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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+
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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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+
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+ pr_debug(PFX "SCI 0x%x received\n", data);
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+
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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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+
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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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+
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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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+
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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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+
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+static DECLARE_WORK(sci_work, process_sci_queue_work);
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+
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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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+
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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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+
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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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+
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+ dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
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+
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+ if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
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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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+
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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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+
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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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+
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+ return IRQ_HANDLED;
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+}
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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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+
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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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+
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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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+
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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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+
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+ cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
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+ }
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+
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+ return 0;
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+}
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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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+
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+ /* Enable all EC events */
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+ olpc_ec_mask_write(EC_SCI_SRC_ALL);
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+
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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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+
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+static int __devinit 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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+
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+ rdmsr(0x51400020, lo, hi);
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+ sci_irq = (lo >> 20) & 15;
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+
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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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+
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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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+
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+ /* Enable SCI from power button, and clear pending interrupts */
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+ sts = inl(acpi_base + CS5536_PM1_STS);
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+ outl((CS5536_PM_PWRBTN << 16) | 0xffff, acpi_base + CS5536_PM1_STS);
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+
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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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+
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+ return r;
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+}
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+
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+static int __devinit setup_ec_sci(void)
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+{
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+ int r;
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+
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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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+
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+ gpio_direction_input(OLPC_GPIO_ECSCI);
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+
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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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+ /*
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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+static int __devinit setup_lid_events(void)
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+{
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+ int r;
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+
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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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+
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+ gpio_direction_input(OLPC_GPIO_LID);
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+
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+ cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
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+ lid_inverted = 0;
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+
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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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+
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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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+
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|
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+ /* 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 __devinit 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);
|
|
|
+ input_free_device(power_button_idev);
|
|
|
+}
|
|
|
+
|
|
|
+static int __devinit 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);
|
|
|
+ input_free_device(ebook_switch_idev);
|
|
|
+}
|
|
|
+
|
|
|
+static int __devinit 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;
|
|
|
+ }
|
|
|
+
|
|
|
+ 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);
|
|
|
+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);
|
|
|
+ input_free_device(lid_switch_idev);
|
|
|
+}
|
|
|
+
|
|
|
+static int __devinit 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 __devexit 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 = __devexit_p(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);
|
Linus Torvalds