From: Hong Liu <hong.liu@xxxxxxxxx>
The power button is connected to MSIC on Medfield, we will get two
interrupts from IOAPIC when pressing or releasing the power button.
Signed-off-by: Hong Liu <hong.liu@xxxxxxxxx>
[Minor fixes as noted by Dmitry]
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 8 ++
drivers/platform/x86/Makefile | 2
drivers/platform/x86/intel_mid_powerbtn.c | 143 +++++++++++++++++++++++++++++
3 files changed, 153 insertions(+), 0 deletions(-)
create mode 100644 drivers/platform/x86/intel_mid_powerbtn.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index d163bc2..95817b0 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -654,4 +654,12 @@ config XO1_RFKILL
Support for enabling/disabling the WLAN interface on the OLPC XO-1
laptop.
+config INTEL_MID_POWER_BUTTON
+ tristate "power button driver for Intel MID platforms"
+ depends on INTEL_SCU_IPC
+ help
+ This driver handles the power button on the Intel MID platforms.
+
+ If unsure, say N.
+
endif # X86_PLATFORM_DEVICES
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 4ec4ff8..a24cd62 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -34,3 +34,5 @@ obj-$(CONFIG_INTEL_IPS) += intel_ips.o
obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o
obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o
obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
+obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
+
diff --git a/drivers/platform/x86/intel_mid_powerbtn.c b/drivers/platform/x86/intel_mid_powerbtn.c
new file mode 100644
index 0000000..0617668
--- /dev/null
+++ b/drivers/platform/x86/intel_mid_powerbtn.c
@@ -0,0 +1,143 @@
+/*
+ * Power button driver for Medfield.
+ *
+ * Copyright (C) 2010 Intel Corp
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <asm/intel_scu_ipc.h>
+
+#define DRIVER_NAME "msic_power_btn"
+
+#define MSIC_IRQ_STAT 0x02
+ #define MSIC_IRQ_PB (1 << 0)
+#define MSIC_PB_CONFIG 0x3e
+#define MSIC_PB_STATUS 0x3f
+ #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
+
+struct mfld_pb_priv {
+ struct input_dev *input;
+ int irq;
+};
+
+static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
+{
+ struct mfld_pb_priv *priv = dev_id;
+ int ret;
+ u8 pbstat;
+
+ ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ input_event(priv->input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL));
+ input_sync(priv->input);
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit mfld_pb_probe(struct platform_device *pdev)
+{
+ struct mfld_pb_priv *priv;
+ struct input_dev *input;
+ int ret;
+ int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -EINVAL;
+
+ priv = kzalloc(sizeof(struct mfld_pb_priv), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!priv || !input) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ priv->input = input;
+ priv->irq = irq;
+ platform_set_drvdata(pdev, priv);
+
+ input->name = pdev->name;
+ input->phys = "power-button/input0";
+ input->dev.parent = &pdev->dev;
+
+ input_set_capability(input, EV_KEY, KEY_POWER);
+
+ ret = request_threaded_irq(priv->irq, NULL, mfld_pb_isr,
+ 0, DRIVER_NAME, priv);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "unable to request irq %d for mfld power button\n",
+ irq);
+ goto fail;
+ }
+
+ ret = input_register_device(input);
+ if (ret == 0)
+ return 0;
+
+ dev_err(&pdev->dev, "unable to register input dev, error %d\n", ret);
+ free_irq(priv->irq, priv);
+
+fail:
+ platform_set_drvdata(pdev, NULL);
+ input_free_device(input);
+ kfree(priv);
+ return ret;
+}
+
+static int __devexit mfld_pb_remove(struct platform_device *pdev)
+{
+ struct mfld_pb_priv *priv = platform_get_drvdata(pdev);
+
+ free_irq(priv->irq, priv);
+ input_unregister_device(priv->input);
+ kfree(priv);
+
+ return 0;
+}
+
+static struct platform_driver mfld_pb_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = mfld_pb_probe,
+ .remove = __devexit_p(mfld_pb_remove),
+};
+
+static int __init mfld_pb_init(void)
+{
+ return platform_driver_register(&mfld_pb_driver);
+}
+
+static void __exit mfld_pb_exit(void)
+{
+ platform_driver_unregister(&mfld_pb_driver);
+}
+
+module_init(mfld_pb_init);
+module_exit(mfld_pb_exit);
+
+MODULE_AUTHOR("Hong Liu <hong.liu@xxxxxxxxx>");
+MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
+MODULE_LICENSE("GPL v2");
--
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