[PATCH v3] input: vt8500: Add power button keypad driver
Tony Prisk
linux at prisktech.co.nz
Mon Dec 31 16:34:07 EST 2012
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 at prisktech.co.nz>
---
CC: linux-kernel at vger.kernel.org
CC: linux-arm-kernel at lists.infradead.org
CC: vt8500-wm8505-linux-kernel at googlegroups.com
CC: linux-input at vger.kernel.org
v2:
Remove devicetree binding for keycode
Add dependency on OF in Kconfig
Move static variables in a struct
Remove redundant inline modifier from kpad_power_timeout()
Remove unneccessary checks against power_button_pressed. Drop variable.
Cleanup the fail path code and add a .remove function.
Change the button behaviour so that a key-released event is only generated once
the key is released, not after timeout.
*Changes tested on WM8650 tablet.
v3:
Remove dependency on PMC node, and change binding document accordingly.
Remove mod_timer call in kpad_power_timeout()
Unmap io memory in fail path and .remove
Update name & phys fields to be more meaningful
Use del_timer_sync rather than del_timer
Fix usage of input_unregister_device/input_free_device
.../bindings/input/vt8500-power-keypad.txt | 17 ++
drivers/input/keyboard/Kconfig | 10 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/wmt_power_keypad.c | 182 ++++++++++++++++++++
4 files changed, 210 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..f6996d5
--- /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.
+- reg : Should contain the register range of the Power Mgmt controller
+- interrupts: should be the power management controller wakeup interrupt.
+
+Example:
+ powerkey: pwrkey at 0 {
+ compatible = "wm,power-keypad";
+ reg = <0xd8130000 0x1000>;
+ interrupts = <22>;
+ };
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 5a240c6..bb1e04f 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 (OF && 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..383b73e
--- /dev/null
+++ b/drivers/input/keyboard/wmt_power_keypad.c
@@ -0,0 +1,182 @@
+/* Wondermedia Power Keypad
+ *
+ * Copyright (C) 2012 Tony Prisk <linux at prisktech.co.nz>
+ *
+ * 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>
+
+struct kpad_pwr_data {
+ struct input_dev *kpad_power;
+ void __iomem *pmc_base;
+ int irq;
+ struct timer_list timer;
+ spinlock_t lock;
+ unsigned int keycode;
+};
+
+static void kpad_power_timeout(unsigned long fcontext)
+{
+ struct kpad_pwr_data *data = (struct kpad_pwr_data *)fcontext;
+ unsigned long flags;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ input_report_key(data->kpad_power, data->keycode, 0);
+ input_sync(data->kpad_power);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+}
+
+static irqreturn_t kpad_power_isr(int irq_num, void *priv)
+{
+ struct kpad_pwr_data *data = priv;
+ u32 status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ status = readl(data->pmc_base + 0x14);
+ writel(status, data->pmc_base + 0x14);
+
+ if (status & BIT(14)) {
+ input_report_key(data->kpad_power, data->keycode, 1);
+ input_sync(data->kpad_power);
+ mod_timer(&data->timer, jiffies + msecs_to_jiffies(250));
+ }
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int vt8500_pwr_kpad_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct kpad_pwr_data *data;
+ u32 status;
+ int err;
+
+ if (!np) {
+ dev_err(&pdev->dev, "devicenode not found\n");
+ return -ENODEV;
+ }
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ dev_err(&pdev->dev, "unable to allocate private data\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, data);
+ data->keycode = KEY_POWER;
+ spin_lock_init(&data->lock);
+
+ data->pmc_base = of_iomap(np, 0);
+ if (!data->pmc_base) {
+ dev_err(&pdev->dev, "unable to map pmc memory\n");
+ return -ENOMEM;
+ }
+
+ /* set power button to soft-power */
+ status = readl(data->pmc_base + 0x54);
+ writel(status | 1, data->pmc_base + 0x54);
+
+ /* clear any pending interrupts */
+ status = readl(data->pmc_base + 0x14);
+ writel(status, data->pmc_base + 0x14);
+
+ data->kpad_power = input_allocate_device();
+ if (!data->kpad_power) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input_set_capability(data->kpad_power, EV_KEY, data->keycode);
+
+ data->kpad_power->name = "Wondermedia Power Button";
+ data->kpad_power->phys = "vt8500-pmc/input0";
+ data->kpad_power->keycode = &data->keycode;
+ data->kpad_power->keycodesize = sizeof(unsigned int);
+ data->kpad_power->keycodemax = 1;
+
+ setup_timer(&data->timer, kpad_power_timeout, (unsigned long)data);
+
+ data->irq = irq_of_parse_and_map(np, 0);
+ err = request_irq(data->irq, &kpad_power_isr, 0, "pwrbtn", data);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ goto cleanup_irq;
+ }
+
+ err = input_register_device(data->kpad_power);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto cleanup_input;
+ }
+
+ return 0;
+
+cleanup_input:
+ free_irq(data->irq, NULL);
+cleanup_irq:
+ del_timer(&data->timer);
+ input_free_device(data->kpad_power);
+ iounmap(data->pmc_base);
+ return err;
+}
+
+static int vt8500_pwr_kpad_remove(struct platform_device *pdev)
+
+{
+ struct kpad_pwr_data *data = platform_get_drvdata(pdev);
+
+ free_irq(data->irq, data);
+ del_timer_sync(&data->timer);
+ input_unregister_device(data->kpad_power);
+ iounmap(data->pmc_base);
+
+ 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,
+ .remove = vt8500_pwr_kpad_remove,
+ .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 at prisktech.co.nz>");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, vt8500_pwr_kpad_dt_ids);
--
1.7.9.5
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