intel_mid_powerbtn: add power button driver for Medfield platform (#3)

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@intel.com> [Minor fixes as noted by Dmitry] Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Matthew Garrett <mjg@redhat.com>

intel_mid_powerbtn: add power button driver for Medfield platform (#3)
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@intel.com> [Minor fixes as noted by Dmitry] Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Hong Liu · Matthew Garrett
1 parent e2d3d44b9a
Showing 3 changed files with 157 additions and 0 deletions Side-by-side Diff
drivers/platform/x86/Kconfig
drivers/platform/x86/Makefile
drivers/platform/x86/intel_mid_powerbtn.c
@@ -616,6 +616,14 @@
 	  Say Y here to support GPIO via the SCU IPC interface
 	  on Intel MID platforms.
  
+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.
+
 config RAR_REGISTER
 	bool "Restricted Access Region Register Driver"
 	depends on PCI && X86_MRST
@@ -36,4 +36,5 @@
 obj-$(CONFIG_XO1_RFKILL)	+= xo1-rfkill.o
 obj-$(CONFIG_XO15_EBOOK)	+= xo15-ebook.o
 obj-$(CONFIG_IBM_RTL)		+= ibm_rtl.o
+obj-$(CONFIG_INTEL_MFLD_THERMAL)	+= intel_mid_thermal.o
+/*
+ * 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;
+	unsigned 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 irq;
+	int error;
+
+	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) {
+		error = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	priv->input = input;
+	priv->irq = irq;
+
+	input->name = pdev->name;
+	input->phys = "power-button/input0";
+	input->id.bustype = BUS_HOST;
+	input->dev.parent = &pdev->dev;
+
+	input_set_capability(input, EV_KEY, KEY_POWER);
+
+	error = request_threaded_irq(priv->irq, NULL, mfld_pb_isr,
+				     0, DRIVER_NAME, priv);
+	if (error) {
+		dev_err(&pdev->dev,
+			"unable to request irq %d for mfld power button\n",
+			irq);
+		goto err_free_mem;
+	}
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(&pdev->dev,
+			"unable to register input dev, error %d\n", error);
+		goto err_free_irq;
+	}
+
+	platform_set_drvdata(pdev, priv);
+	return 0;
+
+err_free_irq:
+	free_irq(priv->irq, priv);
+err_free_mem:
+	input_free_device(input);
+	kfree(priv);
+	return error;
+}
+
+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);
+
+	platform_set_drvdata(pdev, NULL);
+	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);
+}
+module_init(mfld_pb_init);
+
+static void __exit mfld_pb_exit(void)
+{
+	platform_driver_unregister(&mfld_pb_driver);
+}
+module_exit(mfld_pb_exit);
+
+MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
+MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
...	...	@@ -616,6 +616,14 @@
616	616	Say Y here to support GPIO via the SCU IPC interface
617	617	on Intel MID platforms.
618	618
	619	+config INTEL_MID_POWER_BUTTON
	620	+ tristate "power button driver for Intel MID platforms"
	621	+ depends on INTEL_SCU_IPC
	622	+ help
	623	+ This driver handles the power button on the Intel MID platforms.
	624	+
	625	+ If unsure, say N.
	626	+
619	627	config RAR_REGISTER
620	628	bool "Restricted Access Region Register Driver"
621	629	depends on PCI && X86_MRST
...	...	@@ -36,4 +36,5 @@
36	36	obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o
37	37	obj-$(CONFIG_XO15_EBOOK) += xo15-ebook.o
38	38	obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
	39	+obj-$(CONFIG_INTEL_MFLD_THERMAL) += intel_mid_thermal.o
	1	+/*
	2	+ * Power button driver for Medfield.
	3	+ *
	4	+ * Copyright (C) 2010 Intel Corp
	5	+ *
	6	+ * This program is free software; you can redistribute it and/or modify
	7	+ * it under the terms of the GNU General Public License as published by
	8	+ * the Free Software Foundation; version 2 of the License.
	9	+ *
	10	+ * This program is distributed in the hope that it will be useful, but
	11	+ * WITHOUT ANY WARRANTY; without even the implied warranty of
	12	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	+ * General Public License for more details.
	14	+ *
	15	+ * You should have received a copy of the GNU General Public License along
	16	+ * with this program; if not, write to the Free Software Foundation, Inc.,
	17	+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	18	+ */
	19	+
	20	+#include <linux/module.h>
	21	+#include <linux/init.h>
	22	+#include <linux/interrupt.h>
	23	+#include <linux/slab.h>
	24	+#include <linux/platform_device.h>
	25	+#include <linux/input.h>
	26	+#include <asm/intel_scu_ipc.h>
	27	+
	28	+#define DRIVER_NAME "msic_power_btn"
	29	+
	30	+#define MSIC_IRQ_STAT 0x02
	31	+ #define MSIC_IRQ_PB (1 << 0)
	32	+#define MSIC_PB_CONFIG 0x3e
	33	+#define MSIC_PB_STATUS 0x3f
	34	+ #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
	35	+
	36	+struct mfld_pb_priv {
	37	+ struct input_dev *input;
	38	+ unsigned int irq;
	39	+};
	40	+
	41	+static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
	42	+{
	43	+ struct mfld_pb_priv *priv = dev_id;
	44	+ int ret;
	45	+ u8 pbstat;
	46	+
	47	+ ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat);
	48	+ if (ret < 0)
	49	+ return IRQ_HANDLED;
	50	+
	51	+ input_event(priv->input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL));
	52	+ input_sync(priv->input);
	53	+
	54	+ return IRQ_HANDLED;
	55	+}
	56	+
	57	+static int __devinit mfld_pb_probe(struct platform_device *pdev)
	58	+{
	59	+ struct mfld_pb_priv *priv;
	60	+ struct input_dev *input;
	61	+ int irq;
	62	+ int error;
	63	+
	64	+ irq = platform_get_irq(pdev, 0);
	65	+ if (irq < 0)
	66	+ return -EINVAL;
	67	+
	68	+ priv = kzalloc(sizeof(struct mfld_pb_priv), GFP_KERNEL);
	69	+ input = input_allocate_device();
	70	+ if (!priv \|\| !input) {
	71	+ error = -ENOMEM;
	72	+ goto err_free_mem;
	73	+ }
	74	+
	75	+ priv->input = input;
	76	+ priv->irq = irq;
	77	+
	78	+ input->name = pdev->name;
	79	+ input->phys = "power-button/input0";
	80	+ input->id.bustype = BUS_HOST;
	81	+ input->dev.parent = &pdev->dev;
	82	+
	83	+ input_set_capability(input, EV_KEY, KEY_POWER);
	84	+
	85	+ error = request_threaded_irq(priv->irq, NULL, mfld_pb_isr,
	86	+ 0, DRIVER_NAME, priv);
	87	+ if (error) {
	88	+ dev_err(&pdev->dev,
	89	+ "unable to request irq %d for mfld power button\n",
	90	+ irq);
	91	+ goto err_free_mem;
	92	+ }
	93	+
	94	+ error = input_register_device(input);
	95	+ if (error) {
	96	+ dev_err(&pdev->dev,
	97	+ "unable to register input dev, error %d\n", error);
	98	+ goto err_free_irq;
	99	+ }
	100	+
	101	+ platform_set_drvdata(pdev, priv);
	102	+ return 0;
	103	+
	104	+err_free_irq:
	105	+ free_irq(priv->irq, priv);
	106	+err_free_mem:
	107	+ input_free_device(input);
	108	+ kfree(priv);
	109	+ return error;
	110	+}
	111	+
	112	+static int __devexit mfld_pb_remove(struct platform_device *pdev)
	113	+{
	114	+ struct mfld_pb_priv *priv = platform_get_drvdata(pdev);
	115	+
	116	+ free_irq(priv->irq, priv);
	117	+ input_unregister_device(priv->input);
	118	+ kfree(priv);
	119	+
	120	+ platform_set_drvdata(pdev, NULL);
	121	+ return 0;
	122	+}
	123	+
	124	+static struct platform_driver mfld_pb_driver = {
	125	+ .driver = {
	126	+ .name = DRIVER_NAME,
	127	+ .owner = THIS_MODULE,
	128	+ },
	129	+ .probe = mfld_pb_probe,
	130	+ .remove = __devexit_p(mfld_pb_remove),
	131	+};
	132	+
	133	+static int __init mfld_pb_init(void)
	134	+{
	135	+ return platform_driver_register(&mfld_pb_driver);
	136	+}
	137	+module_init(mfld_pb_init);
	138	+
	139	+static void __exit mfld_pb_exit(void)
	140	+{
	141	+ platform_driver_unregister(&mfld_pb_driver);
	142	+}
	143	+module_exit(mfld_pb_exit);
	144	+
	145	+MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
	146	+MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
	147	+MODULE_LICENSE("GPL v2");
	148	+MODULE_ALIAS("platform:" DRIVER_NAME);