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-rw-r--r--drivers/input/misc/Kconfig25
-rw-r--r--drivers/input/misc/Makefile28
-rw-r--r--drivers/input/misc/ati_remote2.c277
-rw-r--r--drivers/input/misc/rb532_button.c120
-rw-r--r--drivers/input/misc/rotary_encoder.c221
5 files changed, 641 insertions, 30 deletions
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 67e5553f699..5c0a631d145 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -214,7 +214,7 @@ config INPUT_SGI_BTNS
config HP_SDC_RTC
tristate "HP SDC Real Time Clock"
- depends on GSC || HP300
+ depends on (GSC || HP300) && SERIO
select HP_SDC
help
Say Y here if you want to support the built-in real time clock
@@ -227,4 +227,27 @@ config INPUT_PCF50633_PMU
Say Y to include support for delivering PMU events via input
layer on NXP PCF50633.
+config INPUT_GPIO_ROTARY_ENCODER
+ tristate "Rotary encoders connected to GPIO pins"
+ depends on GPIOLIB && GENERIC_GPIO
+ help
+ Say Y here to add support for rotary encoders connected to GPIO lines.
+ Check file:Documentation/incput/rotary_encoder.txt for more
+ information.
+
+ To compile this driver as a module, choose M here: the
+ module will be called rotary_encoder.
+
+config INPUT_RB532_BUTTON
+ tristate "Mikrotik Routerboard 532 button interface"
+ depends on MIKROTIK_RB532
+ depends on GPIOLIB && GENERIC_GPIO
+ select INPUT_POLLDEV
+ help
+ Say Y here if you want support for the S1 button built into
+ Mikrotik's Routerboard 532.
+
+ To compile this driver as a module, choose M here: the
+ module will be called rb532_button.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index bb62e6efacf..eb3f407baed 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -4,21 +4,23 @@
# Each configuration option enables a list of files.
-obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
-obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
-obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
-obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
-obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
-obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
-obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas_btns.o
+obj-$(CONFIG_INPUT_APANEL) += apanel.o
obj-$(CONFIG_INPUT_ATI_REMOTE) += ati_remote.o
obj-$(CONFIG_INPUT_ATI_REMOTE2) += ati_remote2.o
-obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
-obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
-obj-$(CONFIG_INPUT_YEALINK) += yealink.o
+obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas_btns.o
obj-$(CONFIG_INPUT_CM109) += cm109.o
+obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
-obj-$(CONFIG_INPUT_UINPUT) += uinput.o
-obj-$(CONFIG_INPUT_APANEL) += apanel.o
-obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
+obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
+obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
+obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
+obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
+obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
+obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
+obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
+obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
+obj-$(CONFIG_INPUT_SPARCSPKR) += sparcspkr.o
+obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
+obj-$(CONFIG_INPUT_YEALINK) += yealink.o
diff --git a/drivers/input/misc/ati_remote2.c b/drivers/input/misc/ati_remote2.c
index 3c9988dc0e9..922c0514158 100644
--- a/drivers/input/misc/ati_remote2.c
+++ b/drivers/input/misc/ati_remote2.c
@@ -31,12 +31,73 @@ MODULE_LICENSE("GPL");
* newly configured "channel".
*/
-static unsigned int channel_mask = 0xFFFF;
-module_param(channel_mask, uint, 0644);
+enum {
+ ATI_REMOTE2_MAX_CHANNEL_MASK = 0xFFFF,
+ ATI_REMOTE2_MAX_MODE_MASK = 0x1F,
+};
+
+static int ati_remote2_set_mask(const char *val,
+ struct kernel_param *kp, unsigned int max)
+{
+ unsigned long mask;
+ int ret;
+
+ if (!val)
+ return -EINVAL;
+
+ ret = strict_strtoul(val, 0, &mask);
+ if (ret)
+ return ret;
+
+ if (mask & ~max)
+ return -EINVAL;
+
+ *(unsigned int *)kp->arg = mask;
+
+ return 0;
+}
+
+static int ati_remote2_set_channel_mask(const char *val,
+ struct kernel_param *kp)
+{
+ pr_debug("%s()\n", __func__);
+
+ return ati_remote2_set_mask(val, kp, ATI_REMOTE2_MAX_CHANNEL_MASK);
+}
+
+static int ati_remote2_get_channel_mask(char *buffer, struct kernel_param *kp)
+{
+ pr_debug("%s()\n", __func__);
+
+ return sprintf(buffer, "0x%04x", *(unsigned int *)kp->arg);
+}
+
+static int ati_remote2_set_mode_mask(const char *val, struct kernel_param *kp)
+{
+ pr_debug("%s()\n", __func__);
+
+ return ati_remote2_set_mask(val, kp, ATI_REMOTE2_MAX_MODE_MASK);
+}
+
+static int ati_remote2_get_mode_mask(char *buffer, struct kernel_param *kp)
+{
+ pr_debug("%s()\n", __func__);
+
+ return sprintf(buffer, "0x%02x", *(unsigned int *)kp->arg);
+}
+
+static unsigned int channel_mask = ATI_REMOTE2_MAX_CHANNEL_MASK;
+#define param_check_channel_mask(name, p) __param_check(name, p, unsigned int)
+#define param_set_channel_mask ati_remote2_set_channel_mask
+#define param_get_channel_mask ati_remote2_get_channel_mask
+module_param(channel_mask, channel_mask, 0644);
MODULE_PARM_DESC(channel_mask, "Bitmask of channels to accept <15:Channel16>...<1:Channel2><0:Channel1>");
-static unsigned int mode_mask = 0x1F;
-module_param(mode_mask, uint, 0644);
+static unsigned int mode_mask = ATI_REMOTE2_MAX_MODE_MASK;
+#define param_check_mode_mask(name, p) __param_check(name, p, unsigned int)
+#define param_set_mode_mask ati_remote2_set_mode_mask
+#define param_get_mode_mask ati_remote2_get_mode_mask
+module_param(mode_mask, mode_mask, 0644);
MODULE_PARM_DESC(mode_mask, "Bitmask of modes to accept <4:PC><3:AUX4><2:AUX3><1:AUX2><0:AUX1>");
static struct usb_device_id ati_remote2_id_table[] = {
@@ -133,12 +194,18 @@ struct ati_remote2 {
u16 keycode[ATI_REMOTE2_MODES][ARRAY_SIZE(ati_remote2_key_table)];
unsigned int flags;
+
+ unsigned int channel_mask;
+ unsigned int mode_mask;
};
static int ati_remote2_probe(struct usb_interface *interface, const struct usb_device_id *id);
static void ati_remote2_disconnect(struct usb_interface *interface);
static int ati_remote2_suspend(struct usb_interface *interface, pm_message_t message);
static int ati_remote2_resume(struct usb_interface *interface);
+static int ati_remote2_reset_resume(struct usb_interface *interface);
+static int ati_remote2_pre_reset(struct usb_interface *interface);
+static int ati_remote2_post_reset(struct usb_interface *interface);
static struct usb_driver ati_remote2_driver = {
.name = "ati_remote2",
@@ -147,6 +214,9 @@ static struct usb_driver ati_remote2_driver = {
.id_table = ati_remote2_id_table,
.suspend = ati_remote2_suspend,
.resume = ati_remote2_resume,
+ .reset_resume = ati_remote2_reset_resume,
+ .pre_reset = ati_remote2_pre_reset,
+ .post_reset = ati_remote2_post_reset,
.supports_autosuspend = 1,
};
@@ -238,7 +308,7 @@ static void ati_remote2_input_mouse(struct ati_remote2 *ar2)
channel = data[0] >> 4;
- if (!((1 << channel) & channel_mask))
+ if (!((1 << channel) & ar2->channel_mask))
return;
mode = data[0] & 0x0F;
@@ -250,7 +320,7 @@ static void ati_remote2_input_mouse(struct ati_remote2 *ar2)
return;
}
- if (!((1 << mode) & mode_mask))
+ if (!((1 << mode) & ar2->mode_mask))
return;
input_event(idev, EV_REL, REL_X, (s8) data[1]);
@@ -277,7 +347,7 @@ static void ati_remote2_input_key(struct ati_remote2 *ar2)
channel = data[0] >> 4;
- if (!((1 << channel) & channel_mask))
+ if (!((1 << channel) & ar2->channel_mask))
return;
mode = data[0] & 0x0F;
@@ -305,7 +375,7 @@ static void ati_remote2_input_key(struct ati_remote2 *ar2)
ar2->mode = mode;
}
- if (!((1 << mode) & mode_mask))
+ if (!((1 << mode) & ar2->mode_mask))
return;
index = ati_remote2_lookup(hw_code);
@@ -410,7 +480,7 @@ static int ati_remote2_getkeycode(struct input_dev *idev,
int index, mode;
mode = scancode >> 8;
- if (mode > ATI_REMOTE2_PC || !((1 << mode) & mode_mask))
+ if (mode > ATI_REMOTE2_PC || !((1 << mode) & ar2->mode_mask))
return -EINVAL;
index = ati_remote2_lookup(scancode & 0xFF);
@@ -427,7 +497,7 @@ static int ati_remote2_setkeycode(struct input_dev *idev, int scancode, int keyc
int index, mode, old_keycode;
mode = scancode >> 8;
- if (mode > ATI_REMOTE2_PC || !((1 << mode) & mode_mask))
+ if (mode > ATI_REMOTE2_PC || !((1 << mode) & ar2->mode_mask))
return -EINVAL;
index = ati_remote2_lookup(scancode & 0xFF);
@@ -550,7 +620,7 @@ static void ati_remote2_urb_cleanup(struct ati_remote2 *ar2)
}
}
-static int ati_remote2_setup(struct ati_remote2 *ar2)
+static int ati_remote2_setup(struct ati_remote2 *ar2, unsigned int ch_mask)
{
int r, i, channel;
@@ -565,8 +635,8 @@ static int ati_remote2_setup(struct ati_remote2 *ar2)
channel = 0;
for (i = 0; i < 16; i++) {
- if ((1 << i) & channel_mask) {
- if (!(~(1 << i) & 0xFFFF & channel_mask))
+ if ((1 << i) & ch_mask) {
+ if (!(~(1 << i) & ch_mask))
channel = i + 1;
break;
}
@@ -585,6 +655,99 @@ static int ati_remote2_setup(struct ati_remote2 *ar2)
return 0;
}
+static ssize_t ati_remote2_show_channel_mask(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
+ struct ati_remote2 *ar2 = usb_get_intfdata(intf);
+
+ return sprintf(buf, "0x%04x\n", ar2->channel_mask);
+}
+
+static ssize_t ati_remote2_store_channel_mask(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
+ struct ati_remote2 *ar2 = usb_get_intfdata(intf);
+ unsigned long mask;
+ int r;
+
+ if (strict_strtoul(buf, 0, &mask))
+ return -EINVAL;
+
+ if (mask & ~ATI_REMOTE2_MAX_CHANNEL_MASK)
+ return -EINVAL;
+
+ r = usb_autopm_get_interface(ar2->intf[0]);
+ if (r) {
+ dev_err(&ar2->intf[0]->dev,
+ "%s(): usb_autopm_get_interface() = %d\n", __func__, r);
+ return r;
+ }
+
+ mutex_lock(&ati_remote2_mutex);
+
+ if (mask != ar2->channel_mask && !ati_remote2_setup(ar2, mask))
+ ar2->channel_mask = mask;
+
+ mutex_unlock(&ati_remote2_mutex);
+
+ usb_autopm_put_interface(ar2->intf[0]);
+
+ return count;
+}
+
+static ssize_t ati_remote2_show_mode_mask(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
+ struct ati_remote2 *ar2 = usb_get_intfdata(intf);
+
+ return sprintf(buf, "0x%02x\n", ar2->mode_mask);
+}
+
+static ssize_t ati_remote2_store_mode_mask(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
+ struct ati_remote2 *ar2 = usb_get_intfdata(intf);
+ unsigned long mask;
+
+ if (strict_strtoul(buf, 0, &mask))
+ return -EINVAL;
+
+ if (mask & ~ATI_REMOTE2_MAX_MODE_MASK)
+ return -EINVAL;
+
+ ar2->mode_mask = mask;
+
+ return count;
+}
+
+static DEVICE_ATTR(channel_mask, 0644, ati_remote2_show_channel_mask,
+ ati_remote2_store_channel_mask);
+
+static DEVICE_ATTR(mode_mask, 0644, ati_remote2_show_mode_mask,
+ ati_remote2_store_mode_mask);
+
+static struct attribute *ati_remote2_attrs[] = {
+ &dev_attr_channel_mask.attr,
+ &dev_attr_mode_mask.attr,
+ NULL,
+};
+
+static struct attribute_group ati_remote2_attr_group = {
+ .attrs = ati_remote2_attrs,
+};
+
static int ati_remote2_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
@@ -615,7 +778,10 @@ static int ati_remote2_probe(struct usb_interface *interface, const struct usb_d
if (r)
goto fail2;
- r = ati_remote2_setup(ar2);
+ ar2->channel_mask = channel_mask;
+ ar2->mode_mask = mode_mask;
+
+ r = ati_remote2_setup(ar2, ar2->channel_mask);
if (r)
goto fail2;
@@ -624,19 +790,24 @@ static int ati_remote2_probe(struct usb_interface *interface, const struct usb_d
strlcat(ar2->name, "ATI Remote Wonder II", sizeof(ar2->name));
- r = ati_remote2_input_init(ar2);
+ r = sysfs_create_group(&udev->dev.kobj, &ati_remote2_attr_group);
if (r)
goto fail2;
+ r = ati_remote2_input_init(ar2);
+ if (r)
+ goto fail3;
+
usb_set_intfdata(interface, ar2);
interface->needs_remote_wakeup = 1;
return 0;
+ fail3:
+ sysfs_remove_group(&udev->dev.kobj, &ati_remote2_attr_group);
fail2:
ati_remote2_urb_cleanup(ar2);
-
usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);
fail1:
kfree(ar2);
@@ -657,6 +828,8 @@ static void ati_remote2_disconnect(struct usb_interface *interface)
input_unregister_device(ar2->idev);
+ sysfs_remove_group(&ar2->udev->dev.kobj, &ati_remote2_attr_group);
+
ati_remote2_urb_cleanup(ar2);
usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);
@@ -715,6 +888,78 @@ static int ati_remote2_resume(struct usb_interface *interface)
return r;
}
+static int ati_remote2_reset_resume(struct usb_interface *interface)
+{
+ struct ati_remote2 *ar2;
+ struct usb_host_interface *alt = interface->cur_altsetting;
+ int r = 0;
+
+ if (alt->desc.bInterfaceNumber)
+ return 0;
+
+ ar2 = usb_get_intfdata(interface);
+
+ dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
+
+ mutex_lock(&ati_remote2_mutex);
+
+ r = ati_remote2_setup(ar2, ar2->channel_mask);
+ if (r)
+ goto out;
+
+ if (ar2->flags & ATI_REMOTE2_OPENED)
+ r = ati_remote2_submit_urbs(ar2);
+
+ if (!r)
+ ar2->flags &= ~ATI_REMOTE2_SUSPENDED;
+
+ out:
+ mutex_unlock(&ati_remote2_mutex);
+
+ return r;
+}
+
+static int ati_remote2_pre_reset(struct usb_interface *interface)
+{
+ struct ati_remote2 *ar2;
+ struct usb_host_interface *alt = interface->cur_altsetting;
+
+ if (alt->desc.bInterfaceNumber)
+ return 0;
+
+ ar2 = usb_get_intfdata(interface);
+
+ dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
+
+ mutex_lock(&ati_remote2_mutex);
+
+ if (ar2->flags == ATI_REMOTE2_OPENED)
+ ati_remote2_kill_urbs(ar2);
+
+ return 0;
+}
+
+static int ati_remote2_post_reset(struct usb_interface *interface)
+{
+ struct ati_remote2 *ar2;
+ struct usb_host_interface *alt = interface->cur_altsetting;
+ int r = 0;
+
+ if (alt->desc.bInterfaceNumber)
+ return 0;
+
+ ar2 = usb_get_intfdata(interface);
+
+ dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
+
+ if (ar2->flags == ATI_REMOTE2_OPENED)
+ r = ati_remote2_submit_urbs(ar2);
+
+ mutex_unlock(&ati_remote2_mutex);
+
+ return r;
+}
+
static int __init ati_remote2_init(void)
{
int r;
diff --git a/drivers/input/misc/rb532_button.c b/drivers/input/misc/rb532_button.c
new file mode 100644
index 00000000000..e2c7f622a0b
--- /dev/null
+++ b/drivers/input/misc/rb532_button.c
@@ -0,0 +1,120 @@
+/*
+ * Support for the S1 button on Routerboard 532
+ *
+ * Copyright (C) 2009 Phil Sutter <n0-1@freewrt.org>
+ */
+
+#include <linux/input-polldev.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-rc32434/gpio.h>
+#include <asm/mach-rc32434/rb.h>
+
+#define DRV_NAME "rb532-button"
+
+#define RB532_BTN_RATE 100 /* msec */
+#define RB532_BTN_KSYM BTN_0
+
+/* The S1 button state is provided by GPIO pin 1. But as this
+ * pin is also used for uart input as alternate function, the
+ * operational modes must be switched first:
+ * 1) disable uart using set_latch_u5()
+ * 2) turn off alternate function implicitly through
+ * gpio_direction_input()
+ * 3) read the GPIO's current value
+ * 4) undo step 2 by enabling alternate function (in this
+ * mode the GPIO direction is fixed, so no change needed)
+ * 5) turn on uart again
+ * The GPIO value occurs to be inverted, so pin high means
+ * button is not pressed.
+ */
+static bool rb532_button_pressed(void)
+{
+ int val;
+
+ set_latch_u5(0, LO_FOFF);
+ gpio_direction_input(GPIO_BTN_S1);
+
+ val = gpio_get_value(GPIO_BTN_S1);
+
+ rb532_gpio_set_func(GPIO_BTN_S1);
+ set_latch_u5(LO_FOFF, 0);
+
+ return !val;
+}
+
+static void rb532_button_poll(struct input_polled_dev *poll_dev)
+{
+ input_report_key(poll_dev->input, RB532_BTN_KSYM,
+ rb532_button_pressed());
+ input_sync(poll_dev->input);
+}
+
+static int __devinit rb532_button_probe(struct platform_device *pdev)
+{
+ struct input_polled_dev *poll_dev;
+ int error;
+
+ poll_dev = input_allocate_polled_device();
+ if (!poll_dev)
+ return -ENOMEM;
+
+ poll_dev->poll = rb532_button_poll;
+ poll_dev->poll_interval = RB532_BTN_RATE;
+
+ poll_dev->input->name = "rb532 button";
+ poll_dev->input->phys = "rb532/button0";
+ poll_dev->input->id.bustype = BUS_HOST;
+ poll_dev->input->dev.parent = &pdev->dev;
+
+ dev_set_drvdata(&pdev->dev, poll_dev);
+
+ input_set_capability(poll_dev->input, EV_KEY, RB532_BTN_KSYM);
+
+ error = input_register_polled_device(poll_dev);
+ if (error) {
+ input_free_polled_device(poll_dev);
+ return error;
+ }
+
+ return 0;
+}
+
+static int __devexit rb532_button_remove(struct platform_device *pdev)
+{
+ struct input_polled_dev *poll_dev = dev_get_drvdata(&pdev->dev);
+
+ input_unregister_polled_device(poll_dev);
+ input_free_polled_device(poll_dev);
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver rb532_button_driver = {
+ .probe = rb532_button_probe,
+ .remove = __devexit_p(rb532_button_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init rb532_button_init(void)
+{
+ return platform_driver_register(&rb532_button_driver);
+}
+
+static void __exit rb532_button_exit(void)
+{
+ platform_driver_unregister(&rb532_button_driver);
+}
+
+module_init(rb532_button_init);
+module_exit(rb532_button_exit);
+
+MODULE_AUTHOR("Phil Sutter <n0-1@freewrt.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Support for S1 button on Routerboard 532");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c
new file mode 100644
index 00000000000..5bb3ab51b8c
--- /dev/null
+++ b/drivers/input/misc/rotary_encoder.c
@@ -0,0 +1,221 @@
+/*
+ * rotary_encoder.c
+ *
+ * (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * state machine code inspired by code from Tim Ruetz
+ *
+ * A generic driver for rotary encoders connected to GPIO lines.
+ * See file:Documentation/input/rotary_encoder.txt for more information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/rotary_encoder.h>
+
+#define DRV_NAME "rotary-encoder"
+
+struct rotary_encoder {
+ unsigned int irq_a;
+ unsigned int irq_b;
+ unsigned int pos;
+ unsigned int armed;
+ unsigned int dir;
+ struct input_dev *input;
+ struct rotary_encoder_platform_data *pdata;
+};
+
+static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
+{
+ struct rotary_encoder *encoder = dev_id;
+ struct rotary_encoder_platform_data *pdata = encoder->pdata;
+ int a = !!gpio_get_value(pdata->gpio_a);
+ int b = !!gpio_get_value(pdata->gpio_b);
+ int state;
+
+ a ^= pdata->inverted_a;
+ b ^= pdata->inverted_b;
+ state = (a << 1) | b;
+
+ switch (state) {
+
+ case 0x0:
+ if (!encoder->armed)
+ break;
+
+ if (encoder->dir) {
+ /* turning counter-clockwise */
+ encoder->pos += pdata->steps;
+ encoder->pos--;
+ encoder->pos %= pdata->steps;
+ } else {
+ /* turning clockwise */
+ encoder->pos++;
+ encoder->pos %= pdata->steps;
+ }
+
+ input_report_abs(encoder->input, pdata->axis, encoder->pos);
+ input_sync(encoder->input);
+
+ encoder->armed = 0;
+ break;
+
+ case 0x1:
+ case 0x2:
+ if (encoder->armed)
+ encoder->dir = state - 1;
+ break;
+
+ case 0x3:
+ encoder->armed = 1;
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit rotary_encoder_probe(struct platform_device *pdev)
+{
+ struct rotary_encoder_platform_data *pdata = pdev->dev.platform_data;
+ struct rotary_encoder *encoder;
+ struct input_dev *input;
+ int err;
+
+ if (!pdata || !pdata->steps) {
+ dev_err(&pdev->dev, "invalid platform data\n");
+ return -ENOENT;
+ }
+
+ encoder = kzalloc(sizeof(struct rotary_encoder), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!encoder || !input) {
+ dev_err(&pdev->dev, "failed to allocate memory for device\n");
+ err = -ENOMEM;
+ goto exit_free_mem;
+ }
+
+ encoder->input = input;
+ encoder->pdata = pdata;
+ encoder->irq_a = gpio_to_irq(pdata->gpio_a);
+ encoder->irq_b = gpio_to_irq(pdata->gpio_b);
+
+ /* create and register the input driver */
+ input->name = pdev->name;
+ input->id.bustype = BUS_HOST;
+ input->dev.parent = &pdev->dev;
+ input->evbit[0] = BIT_MASK(EV_ABS);
+ input_set_abs_params(encoder->input,
+ pdata->axis, 0, pdata->steps, 0, 1);
+
+ err = input_register_device(input);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto exit_free_mem;
+ }
+
+ /* request the GPIOs */
+ err = gpio_request(pdata->gpio_a, DRV_NAME);
+ if (err) {
+ dev_err(&pdev->dev, "unable to request GPIO %d\n",
+ pdata->gpio_a);
+ goto exit_unregister_input;
+ }
+
+ err = gpio_request(pdata->gpio_b, DRV_NAME);
+ if (err) {
+ dev_err(&pdev->dev, "unable to request GPIO %d\n",
+ pdata->gpio_b);
+ goto exit_free_gpio_a;
+ }
+
+ /* request the IRQs */
+ err = request_irq(encoder->irq_a, &rotary_encoder_irq,
+ IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE,
+ DRV_NAME, encoder);
+ if (err) {
+ dev_err(&pdev->dev, "unable to request IRQ %d\n",
+ encoder->irq_a);
+ goto exit_free_gpio_b;
+ }
+
+ err = request_irq(encoder->irq_b, &rotary_encoder_irq,
+ IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE,
+ DRV_NAME, encoder);
+ if (err) {
+ dev_err(&pdev->dev, "unable to request IRQ %d\n",
+ encoder->irq_b);
+ goto exit_free_irq_a;
+ }
+
+ platform_set_drvdata(pdev, encoder);
+
+ return 0;
+
+exit_free_irq_a:
+ free_irq(encoder->irq_a, encoder);
+exit_free_gpio_b:
+ gpio_free(pdata->gpio_b);
+exit_free_gpio_a:
+ gpio_free(pdata->gpio_a);
+exit_unregister_input:
+ input_unregister_device(input);
+ input = NULL; /* so we don't try to free it */
+exit_free_mem:
+ input_free_device(input);
+ kfree(encoder);
+ return err;
+}
+
+static int __devexit rotary_encoder_remove(struct platform_device *pdev)
+{
+ struct rotary_encoder *encoder = platform_get_drvdata(pdev);
+ struct rotary_encoder_platform_data *pdata = pdev->dev.platform_data;
+
+ free_irq(encoder->irq_a, encoder);
+ free_irq(encoder->irq_b, encoder);
+ gpio_free(pdata->gpio_a);
+ gpio_free(pdata->gpio_b);
+ input_unregister_device(encoder->input);
+ platform_set_drvdata(pdev, NULL);
+ kfree(encoder);
+
+ return 0;
+}
+
+static struct platform_driver rotary_encoder_driver = {
+ .probe = rotary_encoder_probe,
+ .remove = __devexit_p(rotary_encoder_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ }
+};
+
+static int __init rotary_encoder_init(void)
+{
+ return platform_driver_register(&rotary_encoder_driver);
+}
+
+static void __exit rotary_encoder_exit(void)
+{
+ platform_driver_unregister(&rotary_encoder_driver);
+}
+
+module_init(rotary_encoder_init);
+module_exit(rotary_encoder_exit);
+
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DESCRIPTION("GPIO rotary encoder driver");
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_LICENSE("GPL v2");
+