This patch adds support for the Power Button keypad found on
Wondermedia netbooks/tablets.
A keymap property is exposed to allowing defining the key
event to be generated when the power button is pressed.
Signed-off-by: Tony Prisk <linux@xxxxxxxxxxxxxxx>
---
.../bindings/input/vt8500-power-keypad.txt | 17 ++
drivers/input/keyboard/Kconfig | 10 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/wmt_power_keypad.c | 174 ++++++++++++++++++++
4 files changed, 202 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/vt8500-power-keypad.txt
create mode 100644 drivers/input/keyboard/wmt_power_keypad.c
diff --git a/Documentation/devicetree/bindings/input/vt8500-power-keypad.txt b/Documentation/devicetree/bindings/input/vt8500-power-keypad.txt
new file mode 100644
index 0000000..bae6228
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/vt8500-power-keypad.txt
@@ -0,0 +1,17 @@
+* Wondermedia Power Keypad device tree bindings
+
+Wondermedia SoCs have a single irq-driven power button attached to
+the power management controller.
+
+Required SoC Specific Properties:
+- compatible: should be one of the following
+ - "wm,power-keypad": For all Wondermedia 8xxx-series SoCs.
+- interrupts: should be the power management controller wakeup interrupt.
+- keymap: linux keycode to generate when power button pressed.
+
+Example:
+ powerkey: pwrkey@0 {
+ compatible = "wm,power-keypad";
+ interrupts = <22>;
+ keymap = <116>; /* KEY_POWER */
+ };
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 5a240c6..c270f27 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -595,6 +595,16 @@ config KEYBOARD_TWL4030
To compile this driver as a module, choose M here: the
module will be called twl4030_keypad.
+config KEYBOARD_WMT_POWER_KEYPAD
+ tristate "Wondermedia Power keypad support"
+ depends on ARCH_VT8500
+ help
+ Say Y here to enable support for the power button keypad
+ on Wondermedia 8xxx-series SoCs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called wmt_power_keypad.
+
config KEYBOARD_XTKBD
tristate "XT keyboard"
select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 44e7600..eea31af 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -52,5 +52,6 @@ obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
obj-$(CONFIG_KEYBOARD_TNETV107X) += tnetv107x-keypad.o
obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
+obj-$(CONFIG_KEYBOARD_WMT_POWER_KEYPAD) += wmt_power_keypad.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
diff --git a/drivers/input/keyboard/wmt_power_keypad.c b/drivers/input/keyboard/wmt_power_keypad.c
new file mode 100644
index 0000000..ce8aa9a
--- /dev/null
+++ b/drivers/input/keyboard/wmt_power_keypad.c
@@ -0,0 +1,174 @@
+/* Wondermedia Power Keypad
+ *
+ * Copyright (C) 2012 Tony Prisk <linux@xxxxxxxxxxxxxxx>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/bitops.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_device.h>
+
+static void __iomem *pmc_base;
+static struct input_dev *kpad_power;
+static spinlock_t kpad_power_lock;
+static int power_button_pressed;
+static struct timer_list kpad_power_timer;
+static unsigned int kpad_power_code;
+
+static inline void kpad_power_timeout(unsigned long fcontext)
+{
+ u32 status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kpad_power_lock, flags);
+
+ status = readl(pmc_base + 0x14);
+
+ if (power_button_pressed) {
+ input_report_key(kpad_power, kpad_power_code, 0);
+ input_sync(kpad_power);
+ power_button_pressed = 0;
+ }
+
+ spin_unlock_irqrestore(&kpad_power_lock, flags);
+}
+
+static irqreturn_t kpad_power_isr(int irq_num, void *data)
+{
+ u32 status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&kpad_power_lock, flags);
+
+ status = readl(pmc_base + 0x14);
+ udelay(100);
+ writel(status, pmc_base + 0x14);
+
+ if (status & BIT(14)) {
+ if (!power_button_pressed) {
+ input_report_key(kpad_power, kpad_power_code, 1);
+ input_sync(kpad_power);
+
+ power_button_pressed = 1;
+
+ mod_timer(&kpad_power_timer,
+ jiffies + msecs_to_jiffies(500));
+ }
+ }
+
+ spin_unlock_irqrestore(&kpad_power_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int vt8500_pwr_kpad_probe(struct platform_device *pdev)
+{
+ struct device_node *np;
+ u32 status;
+ int err;
+ int irq;
+
+ np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
+ if (!np) {
+ dev_err(&pdev->dev, "pmc node not found\n");
+ return -EINVAL;
+ }
+
+ pmc_base = of_iomap(np, 0);
+ if (!pmc_base) {
+ dev_err(&pdev->dev, "unable to map pmc memory\n");
+ return -ENOMEM;
+ }
+
+ np = pdev->dev.of_node;
+ if (!np) {
+ dev_err(&pdev->dev, "devicenode not found\n");
+ return -ENODEV;
+ }
+
+ err = of_property_read_u32(np, "keymap", &kpad_power_code);
+ if (err) {
+ dev_warn(&pdev->dev, "defaulting to KEY_POWER\n");
+ kpad_power_code = KEY_POWER;
+ }
+
+ /* set power button to soft-power */
+ status = readl(pmc_base + 0x54);
+ writel(status | 1, pmc_base + 0x54);
+
+ /* clear any pending interrupts */
+ status = readl(pmc_base + 0x14);
+ writel(status, pmc_base + 0x14);
+
+ kpad_power = input_allocate_device();
+ if (!kpad_power) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&kpad_power_lock);
+ setup_timer(&kpad_power_timer, kpad_power_timeout,
+ (unsigned long)kpad_power);
+
+ irq = irq_of_parse_and_map(np, 0);
+ err = request_irq(irq, &kpad_power_isr, 0, "pwrbtn", NULL);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return err;
+ }
+
+ kpad_power->evbit[0] = BIT_MASK(EV_KEY);
+ set_bit(kpad_power_code, kpad_power->keybit);
+
+ kpad_power->name = "wmt_power_keypad";
+ kpad_power->phys = "wmt_power_keypad";
+ kpad_power->keycode = &kpad_power_code;
+ kpad_power->keycodesize = sizeof(unsigned int);
+ kpad_power->keycodemax = 1;
+
+ err = input_register_device(kpad_power);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static struct of_device_id vt8500_pwr_kpad_dt_ids[] = {
+ { .compatible = "wm,power-keypad" },
+ { /* Sentinel */ },
+};
+
+static struct platform_driver vt8500_pwr_kpad_driver = {
+ .probe = vt8500_pwr_kpad_probe,
+ .driver = {
+ .name = "wmt-power-keypad",
+ .owner = THIS_MODULE,
+ .of_match_table = vt8500_pwr_kpad_dt_ids,
+ },
+};
+
+module_platform_driver(vt8500_pwr_kpad_driver);
+
+MODULE_DESCRIPTION("Wondermedia Power Keypad Driver");
+MODULE_AUTHOR("Tony Prisk <linux@xxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, vt8500_pwr_kpad_dt_ids);
--
1.7.9.5
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