[PATCH 2/4] twl6030: add power button as an input key
Vicente Bergas
vicencb at gmail.com
Sun Mar 10 19:36:05 EDT 2013
Signed-off-by: Vicente Bergas <vicencb at gmail.com>
---
drivers/input/Kconfig | 7 ++++
drivers/input/Makefile | 1 +
drivers/input/twl6030_pwrbtn.c | 95 ++++++++++++++++++++++++++++++++++++++++++
include/twl6030_pwrbtn.h | 23 ++++++++++
4 files changed, 126 insertions(+)
create mode 100644 drivers/input/twl6030_pwrbtn.c
create mode 100644 include/twl6030_pwrbtn.h
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index a6f1f47..3d9016b 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -38,4 +38,11 @@ config KEYBOARD_QT1070
Say Y here if you want to use Atmel AT42QT1070 QTouch
Sensor chip as input device.
+config KEYBOARD_TWL6030
+ tristate "TWL6030 power button"
+ depends on MFD_TWL6030
+ select POLLER
+ help
+ Say Y here if you want to use TWL6030 power button as a key.
+
endmenu
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index d042980..b9bcc82 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
+obj-$(CONFIG_KEYBOARD_TWL6030) += twl6030_pwrbtn.o
obj-$(CONFIG_KEYBOARD_IMX_KEYPAD) += imx_keypad.o
obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o
diff --git a/drivers/input/twl6030_pwrbtn.c b/drivers/input/twl6030_pwrbtn.c
new file mode 100644
index 0000000..b22404c
--- /dev/null
+++ b/drivers/input/twl6030_pwrbtn.c
@@ -0,0 +1,95 @@
+/*
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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 <common.h>
+#include <errno.h>
+#include <init.h>
+#include <clock.h>
+#include <poller.h>
+#include <twl6030_pwrbtn.h>
+
+#define PWR_PWRON_IRQ (1 << 0)
+
+static void ic2_key_poller(struct poller_struct *poller)
+{
+ struct twl6030_pwrbtn_platform_data *pdata = container_of(
+ poller, struct twl6030_pwrbtn_platform_data, poller);
+ u8 val;
+
+ if (twl6030_reg_read(pdata->twl6030, TWL6030_PMCM_HW, &val)) {
+ pr_err("reading i2c\n");
+ return;
+ }
+ val = !(val & PWR_PWRON_IRQ);
+ if (val != pdata->previous_state && val) {
+ kfifo_put(pdata->recv_fifo, (u_char *)&pdata->code,
+ sizeof(int));
+ debug("pressed power button as %d\n", pdata->code);
+ }
+ pdata->previous_state = val;
+}
+
+static int twl6030_pwrbtn_tstc(struct console_device *cdev)
+{
+ struct twl6030_pwrbtn_platform_data *pdata = container_of(
+ cdev, struct twl6030_pwrbtn_platform_data, cdev);
+
+ return (kfifo_len(pdata->recv_fifo) == 0) ? 0 : 1;
+}
+
+static int twl6030_pwrbtn_getc(struct console_device *cdev)
+{
+ int code = 0;
+ struct twl6030_pwrbtn_platform_data *pdata = container_of(
+ cdev, struct twl6030_pwrbtn_platform_data, cdev);
+
+ kfifo_get(pdata->recv_fifo, (u_char *)&code, sizeof(int));
+ return code;
+}
+
+static int __init twl6030_pwrbtn_probe(struct device_d *dev)
+{
+ struct twl6030_pwrbtn_platform_data *pdata;
+ struct console_device *cdev;
+
+ pdata = dev->platform_data;
+
+ if (!pdata) {
+ pr_err("missing platform_data\n");
+ return -ENODEV;
+ }
+
+ pdata->twl6030 = twl6030_get();
+ if (!pdata->fifo_size)
+ pdata->fifo_size = 4;
+
+ pdata->recv_fifo = kfifo_alloc(pdata->fifo_size);
+
+ pdata->poller.func = ic2_key_poller;
+
+ cdev = &pdata->cdev;
+ dev->type_data = cdev;
+ cdev->dev = dev;
+ cdev->f_caps = CONSOLE_STDIN;
+ cdev->tstc = twl6030_pwrbtn_tstc;
+ cdev->getc = twl6030_pwrbtn_getc;
+
+ console_register(&pdata->cdev);
+
+ return poller_register(&pdata->poller);
+}
+
+static struct driver_d twl6030_pwrbtn_driver = {
+ .name = "twl6030_pwrbtn",
+ .probe = twl6030_pwrbtn_probe,
+};
+device_platform_driver(twl6030_pwrbtn_driver);
diff --git a/include/twl6030_pwrbtn.h b/include/twl6030_pwrbtn.h
new file mode 100644
index 0000000..e7e8383
--- /dev/null
+++ b/include/twl6030_pwrbtn.h
@@ -0,0 +1,23 @@
+#ifndef _TWL6030_PWRBTN_H
+#define _TWL6030_PWRBTN_H
+
+#include <poller.h>
+#include <kfifo.h>
+#include <mfd/twl6030.h>
+
+struct twl6030_pwrbtn_platform_data {
+ /* Configuration parameters */
+ int code;
+ /* optional */
+ int fifo_size;
+
+ /* internal */
+ u8 previous_state;
+
+ struct twl6030 *twl6030;
+ struct kfifo *recv_fifo;
+ struct poller_struct poller;
+ struct console_device cdev;
+};
+
+#endif
--
1.8.1.5
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