* [RFC ebeam PATCH 3/3] input: misc: New USB eBeam input driver.
[not found] ` <1343433754-3887-1-git-send-email-yann.cantin-QFKgK+z4sOrR7s880joybQ@public.gmane.org>
@ 2012-07-28 0:02 ` Yann Cantin
2012-07-28 1:42 ` Dmitry Torokhov
0 siblings, 1 reply; 8+ messages in thread
From: Yann Cantin @ 2012-07-28 0:02 UTC (permalink / raw)
To: linux-input-u79uwXL29TY76Z2rM5mHXA,
linux-usb-u79uwXL29TY76Z2rM5mHXA
Cc: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r,
dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Yann Cantin
Signed-off-by: Yann Cantin <yann.cantin-QFKgK+z4sOrR7s880joybQ@public.gmane.org>
---
drivers/input/misc/Kconfig | 21 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/ebeam.c | 895 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 917 insertions(+)
create mode 100644 drivers/input/misc/ebeam.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 7faf4a7..0e798cb 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -73,6 +73,27 @@ config INPUT_BMA150
To compile this driver as a module, choose M here: the
module will be called bma150.
+config INPUT_EBEAM_USB
+ tristate "USB eBeam driver"
+ depends on USB_ARCH_HAS_HCD
+ select USB
+ help
+ Say Y here if you have a USB eBeam pointing device and want to
+ use it without any proprietary user space tools.
+
+ Have a look at <http://sourceforge.net/projects/ebeam/> for
+ a usage description and the required user-space tools.
+
+ Currently, only the Classic Projection model is supported.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ebeam.
+
+config INPUT_EBEAM_USB_CLASSIC
+ bool "eBeam Classic Projection support"
+ depends on INPUT_EBEAM_USB
+ default y
+
config INPUT_PCSPKR
tristate "PC Speaker support"
depends on PCSPKR_PLATFORM
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index f55cdf4..4b5e4a9 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
+obj-$(CONFIG_INPUT_EBEAM_USB) += ebeam.o
obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
obj-$(CONFIG_INPUT_GPIO_TILT_POLLED) += gpio_tilt_polled.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
diff --git a/drivers/input/misc/ebeam.c b/drivers/input/misc/ebeam.c
new file mode 100644
index 0000000..a18615a
--- /dev/null
+++ b/drivers/input/misc/ebeam.c
@@ -0,0 +1,895 @@
+/******************************************************************************
+ *
+ * eBeam driver
+ *
+ * Copyright (C) 2012 Yann Cantin (yann.cantin-QFKgK+z4sOrR7s880joybQ@public.gmane.org)
+ *
+ * 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.
+ *
+ * based on
+ *
+ * usbtouchscreen.c by Daniel Ritz <daniel.ritz-OI3hZJvNYWs@public.gmane.org>
+ * aiptek.c (sysfs/settings) by Chris Atenasio <chris-v4AJ0sPprEc@public.gmane.org>
+ * Bryan W. Headley <bwheadley-ihVZJaRskl1bRRN4PJnoQQ@public.gmane.org>
+ *
+ *****************************************************************************/
+
+#define DEBUG
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/hid.h>
+
+#define DRIVER_VERSION "v0.5"
+#define DRIVER_AUTHOR "Yann Cantin <yann.cantin-QFKgK+z4sOrR7s880joybQ@public.gmane.org>"
+#define DRIVER_DESC "USB eBeam Driver"
+
+#define USB_VENDOR_ID_EFI 0x2650 /* Electronics For Imaging, Inc */
+#define USB_DEVICE_ID_EFI_CLASSIC 0x1311 /* Classic projection "La banane" */
+
+#define EBEAM_BTN_TIP 0x1 /* tip */
+#define EBEAM_BTN_LIT 0x2 /* little */
+#define EBEAM_BTN_BIG 0x4 /* big */
+
+/* until KConfig */
+#define CONFIG_INPUT_EBEAM_USB_CLASSIC
+
+/* device specifc data/functions */
+struct ebeam_device;
+struct ebeam_device_info {
+ int min_X;
+ int max_X;
+ int min_Y;
+ int max_Y;
+
+ /*
+ * TODO : Check if it's really necessary, waiting for other device info.
+ * Always service the USB devices irq not just when the input device is
+ * open. This is useful when devices have a watchdog which prevents us
+ * from periodically polling the device. Leave this unset unless your
+ * ebeam device requires it, as it does consume more of the USB
+ * bandwidth.
+ */
+ bool irq_always;
+
+ int rept_size;
+
+ /* optional, generic exist */
+ void (*process_pkt) (struct ebeam_device *ebeam,
+ unsigned char *pkt,
+ int len);
+
+ /* mandatory, model-specific */
+ int (*read_data) (struct ebeam_device *ebeam,
+ unsigned char *pkt);
+ void (*setup_input) (struct ebeam_device *ebeam,
+ struct input_dev *input_dev);
+ void (*report_input) (struct ebeam_device *ebeam);
+
+ /* optional, model-specific */
+ int (*alloc) (struct ebeam_device *ebeam);
+ int (*init) (struct ebeam_device *ebeam);
+ void (*exit) (struct ebeam_device *ebeam);
+};
+
+/* ebeam settings */
+struct ebeam_settings {
+ int min_x;
+ int max_x;
+ int min_y;
+ int max_y;
+
+ /* H matrix */
+ s64 h1;
+ s64 h2;
+ s64 h3;
+ s64 h4;
+ s64 h5;
+ s64 h6;
+ s64 h7;
+ s64 h8;
+ s64 h9;
+};
+
+/* ebeam device */
+struct ebeam_device {
+ unsigned char *data;
+ dma_addr_t data_dma;
+ unsigned char *buffer;
+ int buf_len;
+ struct urb *irq;
+ struct usb_interface *interface;
+ struct input_dev *input;
+ struct ebeam_device_info *type;
+ char name[128];
+ char phys[64];
+ void *priv;
+
+ struct ebeam_settings cursetting; /* device's current settings */
+ struct ebeam_settings newsetting; /* ... and new ones */
+
+ bool calibrated; /* false : send raw
+ * true : send computed */
+ u16 X, Y; /* raw coordinates */
+ int x, y; /* computed coordinates */
+ int btn_map; /* internal buttons map */
+};
+
+
+/* device types */
+enum {
+ DEVTYPE_IGNORE = -1,
+ DEVTYPE_CLASSIC,
+};
+
+static const struct usb_device_id ebeam_devices[] = {
+#ifdef CONFIG_INPUT_EBEAM_USB_CLASSIC
+ {USB_DEVICE(USB_VENDOR_ID_EFI, USB_DEVICE_ID_EFI_CLASSIC),
+ .driver_info = DEVTYPE_CLASSIC},
+#endif
+ {}
+};
+
+/*******************************************************************************
+ * sysfs part
+ */
+
+/*
+ * screen min/max and H matrix coefs
+ * _get return *current* value
+ * _set set new value
+ */
+#define DEVICE_MINMAX_ATTR(MM) \
+static ssize_t ebeam_##MM##_get(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct ebeam_device *ebeam = dev_get_drvdata(dev); \
+ \
+ return snprintf(buf, PAGE_SIZE, "%d\n", ebeam->cursetting.MM); \
+} \
+static ssize_t ebeam_##MM##_set(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, \
+ size_t count) \
+{ \
+ struct ebeam_device *ebeam = dev_get_drvdata(dev); \
+ int err, MM; \
+ \
+ err = kstrtoint(buf, 10, &MM); \
+ if (err) \
+ return err; \
+ \
+ ebeam->newsetting.MM = MM; \
+ return count; \
+} \
+static DEVICE_ATTR(MM, S_IRUGO | S_IWUGO, \
+ ebeam_##MM##_get, \
+ ebeam_##MM##_set)
+
+DEVICE_MINMAX_ATTR(min_x);
+DEVICE_MINMAX_ATTR(max_x);
+DEVICE_MINMAX_ATTR(min_y);
+DEVICE_MINMAX_ATTR(max_y);
+
+#define DEVICE_H_ATTR(SET_ID) \
+static ssize_t ebeam_h##SET_ID##_get(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct ebeam_device *ebeam = dev_get_drvdata(dev); \
+ \
+ return snprintf(buf, PAGE_SIZE, "%lld\n", ebeam->cursetting.h##SET_ID);\
+} \
+static ssize_t ebeam_h##SET_ID##_set(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, \
+ size_t count) \
+{ \
+ struct ebeam_device *ebeam = dev_get_drvdata(dev); \
+ int err; \
+ u64 h; \
+ \
+ err = kstrtoll(buf, 10, &h); \
+ if (err) \
+ return err; \
+ \
+ ebeam->newsetting.h##SET_ID = h; \
+ return count; \
+} \
+static DEVICE_ATTR(h##SET_ID, S_IRUGO | S_IWUGO, \
+ ebeam_h##SET_ID##_get, \
+ ebeam_h##SET_ID##_set)
+
+DEVICE_H_ATTR(1);
+DEVICE_H_ATTR(2);
+DEVICE_H_ATTR(3);
+DEVICE_H_ATTR(4);
+DEVICE_H_ATTR(5);
+DEVICE_H_ATTR(6);
+DEVICE_H_ATTR(7);
+DEVICE_H_ATTR(8);
+DEVICE_H_ATTR(9);
+
+/*
+ * sysfs calibrated
+ * Once H matrix coefs are set, writing 1 to this file triggers
+ * coordinates mapping.
+ * Anything else reset the device to un-calibrated mode,
+ * storing cursetting in newsetting.
+*/
+static ssize_t ebeam_calibrated_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ebeam_device *ebeam = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", ebeam->calibrated);
+}
+
+static ssize_t ebeam_calibrated_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct ebeam_device *ebeam = dev_get_drvdata(dev);
+ int err, c;
+
+ err = kstrtoint(buf, 10, &c);
+ if (err)
+ return err;
+
+ if (c == 1) {
+ memcpy(&ebeam->cursetting, &ebeam->newsetting,
+ sizeof(struct ebeam_settings));
+ ebeam->calibrated = true;
+ ebeam->type->setup_input(ebeam, ebeam->input);
+ } else {
+ memcpy(&ebeam->newsetting, &ebeam->cursetting,
+ sizeof(struct ebeam_settings));
+ ebeam->calibrated = false;
+ ebeam->type->setup_input(ebeam, ebeam->input);
+ }
+
+ return count;
+}
+
+static DEVICE_ATTR(calibrated, S_IRUGO | S_IWUGO,
+ ebeam_calibrated_get, ebeam_calibrated_set);
+
+static struct attribute *ebeam_attrs[] = {
+ &dev_attr_min_x.attr,
+ &dev_attr_min_y.attr,
+ &dev_attr_max_x.attr,
+ &dev_attr_max_y.attr,
+ &dev_attr_h1.attr,
+ &dev_attr_h2.attr,
+ &dev_attr_h3.attr,
+ &dev_attr_h4.attr,
+ &dev_attr_h5.attr,
+ &dev_attr_h6.attr,
+ &dev_attr_h7.attr,
+ &dev_attr_h8.attr,
+ &dev_attr_h9.attr,
+ &dev_attr_calibrated.attr,
+ NULL
+};
+
+static const struct attribute_group ebeam_attr_group = {
+ .attrs = ebeam_attrs,
+};
+
+/*******************************************************************************
+ * classic projection Part
+ */
+
+#ifdef CONFIG_INPUT_EBEAM_USB_CLASSIC
+/* IRQ */
+static int classic_read_data(struct ebeam_device *ebeam, unsigned char *pkt)
+{
+
+/*
+ * Packet description : 8 bytes
+ *
+ * nop packet : FF FF FF FF FF FF FF FF
+ *
+ * pkt[0] : Sensors
+ * bit 1 : ultrasound signal (guessed)
+ * bit 2 : IR signal (tested with a remote...) ;
+ * readings OK : 0x03 (anything else is a show-stopper)
+ *
+ * pkt[1] : X low
+ * pkt[2] : X high
+ *
+ * pkt[3] : Y low
+ * pkt[4] : Y high
+ *
+ * pkt[5] : fiability ?
+ * often 0xC0
+ * > 0x80 : OK
+ *
+ * pkt[6] :
+ * buttons state (low 4 bits)
+ * 0x1 = no buttons
+ * bit 0 : tip (WARNING inversed : 0=pressed)
+ * bit 1 : ? (always 0 during tests)
+ * bit 2 : little (1=pressed)
+ * bit 3 : big (1=pressed)
+ *
+ * pointer ID : (hight 4 bits)
+ * Tested : 0x6=wand ;
+ * Guessed : 0x1=red ; 0x2=blue ; 0x3=green ; 0x4=black ;
+ * 0x5=eraser
+ * bit 4 : pointer ID
+ * bit 5 : pointer ID
+ * bit 6 : pointer ID
+ * bit 7 : pointer ID
+ *
+ *
+ * pkt[7] : fiability ?
+ * often 0xFF
+ *
+ */
+
+ /* Filtering bad/nop packet */
+ if (pkt[0] != 0x03)
+ return 0;
+
+ ebeam->X = (pkt[2] << 8) | pkt[1];
+ ebeam->Y = (pkt[4] << 8) | pkt[3];
+
+ ebeam->btn_map = (!(pkt[6] & 0x1)) |
+ ((pkt[6] & 0x4) >> 1) |
+ ((pkt[6] & 0x8) >> 1);
+
+ return 1;
+}
+
+/* IRQ */
+static void classic_report_input(struct ebeam_device *ebeam)
+{
+ input_report_key(ebeam->input, BTN_LEFT,
+ (ebeam->btn_map & EBEAM_BTN_TIP));
+ input_report_key(ebeam->input, BTN_MIDDLE,
+ (ebeam->btn_map & EBEAM_BTN_LIT));
+ input_report_key(ebeam->input, BTN_RIGHT,
+ (ebeam->btn_map & EBEAM_BTN_BIG));
+
+ input_report_abs(ebeam->input, ABS_X, ebeam->x);
+ input_report_abs(ebeam->input, ABS_Y, ebeam->y);
+
+ input_sync(ebeam->input);
+}
+
+static void classic_setup_input(struct ebeam_device *ebeam,
+ struct input_dev *input_dev)
+{
+ unsigned long flags;
+
+ /* Take event lock while modifying parameters */
+ spin_lock_irqsave(&input_dev->event_lock, flags);
+
+ /* Properties */
+ set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
+
+ /* Events generated */
+ set_bit(EV_KEY, input_dev->evbit);
+ set_bit(EV_ABS, input_dev->evbit);
+
+ /* Keys */
+ set_bit(BTN_LEFT, input_dev->keybit);
+ set_bit(BTN_MIDDLE, input_dev->keybit);
+ set_bit(BTN_RIGHT, input_dev->keybit);
+
+ /* Axis */
+ if (!ebeam->calibrated) {
+ ebeam->cursetting.min_x = ebeam->type->min_X;
+ ebeam->cursetting.max_x = ebeam->type->max_X;
+ ebeam->cursetting.min_y = ebeam->type->min_Y;
+ ebeam->cursetting.max_y = ebeam->type->max_Y;
+ }
+
+ input_set_abs_params(input_dev, ABS_X,
+ ebeam->cursetting.min_x, ebeam->cursetting.max_x,
+ 0, 0);
+ input_set_abs_params(input_dev, ABS_Y,
+ ebeam->cursetting.min_y, ebeam->cursetting.max_y,
+ 0, 0);
+
+ spin_unlock_irqrestore(&input_dev->event_lock, flags);
+}
+
+#endif
+
+/*****************************************************************************
+ * device descriptors
+ */
+static struct ebeam_device_info ebeam_dev_info[] = {
+#ifdef CONFIG_INPUT_EBEAM_USB_CLASSIC
+ [DEVTYPE_CLASSIC] = {
+ .min_X = 0,
+ .max_X = 65535,
+ .min_Y = 0,
+ .max_Y = 65535,
+ .rept_size = 8,
+ .read_data = classic_read_data,
+ .setup_input = classic_setup_input,
+ .report_input = classic_report_input,
+ },
+#endif
+};
+
+/*******************************************************************************
+ * Generic Part
+ * Nothing model-specific below this point
+ */
+
+static void ebeam_init_settings(struct ebeam_device *ebeam)
+{
+ ebeam->calibrated = false;
+
+ /* Init (x,y) min/max to raw ones */
+ ebeam->cursetting.min_x = ebeam->newsetting.min_x = ebeam->type->min_X;
+ ebeam->cursetting.max_x = ebeam->newsetting.max_x = ebeam->type->max_X;
+ ebeam->cursetting.min_y = ebeam->newsetting.min_y = ebeam->type->min_Y;
+ ebeam->cursetting.max_y = ebeam->newsetting.max_y = ebeam->type->max_Y;
+
+ /* Safe values for the H matrix (Identity) */
+ ebeam->cursetting.h1 = ebeam->newsetting.h1 = 1;
+ ebeam->cursetting.h2 = ebeam->newsetting.h2 = 0;
+ ebeam->cursetting.h3 = ebeam->newsetting.h3 = 0;
+
+ ebeam->cursetting.h4 = ebeam->newsetting.h4 = 0;
+ ebeam->cursetting.h5 = ebeam->newsetting.h5 = 1;
+ ebeam->cursetting.h6 = ebeam->newsetting.h6 = 0;
+
+ ebeam->cursetting.h7 = ebeam->newsetting.h7 = 0;
+ ebeam->cursetting.h8 = ebeam->newsetting.h8 = 0;
+ ebeam->cursetting.h9 = ebeam->newsetting.h9 = 1;
+}
+
+/*
+ * IRQ
+ * compute screen coordinates from raw
+ * Overflow and negative values are user space's problem
+ */
+static bool ebeam_calculate_xy(struct ebeam_device *ebeam)
+{
+ /* TODO : check if u64 division is available on all plateform */
+
+ s64 scale;
+
+ if (!ebeam->calibrated) {
+ ebeam->x = ebeam->X;
+ ebeam->y = ebeam->Y;
+ } else {
+ scale = ebeam->cursetting.h7 * ebeam->X +
+ ebeam->cursetting.h8 * ebeam->Y +
+ ebeam->cursetting.h9;
+
+ /* Who want a division by zero in kernel ? */
+ if (scale == 0) {
+ dev_err(&(ebeam->interface)->dev,
+ "%s - Division by zero, wrong calibration.\n",
+ __func__);
+ dev_err(&(ebeam->interface)->dev,
+ "%s - Resetting to un-calibrated mode.\n",
+ __func__);
+ ebeam->calibrated = false;
+ return 0;
+ }
+
+ /*
+ * We *must* round the result, but not with (int) (v1/v2 + 0.5)
+ *
+ * (int) (v1/v2 + 0.5) <=> (int) ( (2*v1 + v2)/(2*v2) )
+ */
+ ebeam->x = (int) ((((ebeam->cursetting.h1 * ebeam->X +
+ ebeam->cursetting.h2 * ebeam->Y +
+ ebeam->cursetting.h3) << 1) + scale) /
+ (scale << 1));
+ ebeam->y = (int) ((((ebeam->cursetting.h4 * ebeam->X +
+ ebeam->cursetting.h5 * ebeam->Y +
+ ebeam->cursetting.h6) << 1) + scale) /
+ (scale << 1));
+ }
+
+ return 1;
+}
+
+/* IRQ */
+/* generic function, may be overloaded */
+static void ebeam_process_pkt(struct ebeam_device *ebeam,
+ unsigned char *pkt, int len)
+{
+ struct ebeam_device_info *type = ebeam->type;
+
+ if (!type->read_data(ebeam, pkt))
+ return;
+
+ if (!ebeam_calculate_xy(ebeam))
+ return;
+
+ type->report_input(ebeam);
+}
+
+/* IRQ
+ * handler */
+static void ebeam_irq(struct urb *urb)
+{
+ struct ebeam_device *ebeam = urb->context;
+ struct device *dev = &ebeam->interface->dev;
+ int retval;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ break;
+ case -ETIME:
+ /* this urb is timing out */
+ dev_dbg(dev,
+ "%s - urb timed out - was the device unplugged?\n",
+ __func__);
+ return;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ case -EPIPE:
+ /* this urb is terminated, clean up */
+ dev_dbg(dev, "%s - urb shutting down with status: %d\n",
+ __func__, urb->status);
+ return;
+ default:
+ dev_dbg(dev, "%s - nonzero urb status received: %d\n",
+ __func__, urb->status);
+ goto exit;
+ }
+
+ ebeam->type->process_pkt(ebeam, ebeam->data, urb->actual_length);
+
+exit:
+ usb_mark_last_busy(interface_to_usbdev(ebeam->interface));
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+ if (retval)
+ dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
+ __func__, retval);
+}
+
+static int ebeam_open(struct input_dev *input)
+{
+ struct ebeam_device *ebeam = input_get_drvdata(input);
+ int r;
+
+ ebeam->irq->dev = interface_to_usbdev(ebeam->interface);
+
+ r = usb_autopm_get_interface(ebeam->interface) ? -EIO : 0;
+ if (r < 0)
+ goto out;
+
+ if (!ebeam->type->irq_always) {
+ if (usb_submit_urb(ebeam->irq, GFP_KERNEL)) {
+ r = -EIO;
+ goto out_put;
+ }
+ }
+
+ ebeam->interface->needs_remote_wakeup = 1;
+out_put:
+ usb_autopm_put_interface(ebeam->interface);
+out:
+ return r;
+}
+
+static void ebeam_close(struct input_dev *input)
+{
+ struct ebeam_device *ebeam = input_get_drvdata(input);
+ int r;
+
+ if (!ebeam->type->irq_always)
+ usb_kill_urb(ebeam->irq);
+
+ r = usb_autopm_get_interface(ebeam->interface);
+ ebeam->interface->needs_remote_wakeup = 0;
+
+ if (!r)
+ usb_autopm_put_interface(ebeam->interface);
+}
+
+static int ebeam_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct ebeam_device *ebeam = usb_get_intfdata(intf);
+
+ usb_kill_urb(ebeam->irq);
+
+ return 0;
+}
+
+static int ebeam_resume(struct usb_interface *intf)
+{
+ struct ebeam_device *ebeam = usb_get_intfdata(intf);
+ struct input_dev *input = ebeam->input;
+ int result = 0;
+
+ mutex_lock(&input->mutex);
+ if (input->users || ebeam->type->irq_always)
+ result = usb_submit_urb(ebeam->irq, GFP_NOIO);
+ mutex_unlock(&input->mutex);
+
+ return result;
+}
+
+static int ebeam_reset_resume(struct usb_interface *intf)
+{
+ struct ebeam_device *ebeam = usb_get_intfdata(intf);
+ struct input_dev *input = ebeam->input;
+ int err = 0;
+
+ /* reinit the device */
+ if (ebeam->type->init) {
+ err = ebeam->type->init(ebeam);
+ if (err) {
+ dev_dbg(&intf->dev,
+ "%s - type->init() failed, err: %d\n",
+ __func__, err);
+ return err;
+ }
+ }
+
+ /* restart IO if needed */
+ mutex_lock(&input->mutex);
+ if (input->users)
+ err = usb_submit_urb(ebeam->irq, GFP_NOIO);
+ mutex_unlock(&input->mutex);
+
+ return err;
+}
+
+static void ebeam_free_buffers(struct usb_device *udev,
+ struct ebeam_device *ebeam)
+{
+ usb_free_coherent(udev, ebeam->type->rept_size,
+ ebeam->data, ebeam->data_dma);
+ kfree(ebeam->buffer);
+}
+
+static struct usb_endpoint_descriptor *
+ebeam_get_input_endpoint(struct usb_host_interface *interface)
+{
+ int i;
+
+ for (i = 0; i < interface->desc.bNumEndpoints; i++)
+ if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
+ return &interface->endpoint[i].desc;
+
+ return NULL;
+}
+
+static int ebeam_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct ebeam_device *ebeam;
+ struct input_dev *input_dev;
+ struct usb_endpoint_descriptor *endpoint;
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct ebeam_device_info *type;
+ int err = -ENOMEM;
+
+ /* some devices are ignored */
+ if (id->driver_info == DEVTYPE_IGNORE)
+ return -ENODEV;
+
+ endpoint = ebeam_get_input_endpoint(intf->cur_altsetting);
+ if (!endpoint)
+ return -ENXIO;
+
+ ebeam = kzalloc(sizeof(struct ebeam_device), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ebeam || !input_dev)
+ goto out_free;
+
+ type = &ebeam_dev_info[id->driver_info];
+ ebeam->type = type;
+ ebeam_init_settings(ebeam);
+
+ if (!type->process_pkt)
+ type->process_pkt = ebeam_process_pkt;
+
+ ebeam->data = usb_alloc_coherent(udev, type->rept_size,
+ GFP_KERNEL, &ebeam->data_dma);
+ if (!ebeam->data)
+ goto out_free;
+
+ ebeam->irq = usb_alloc_urb(0, GFP_KERNEL);
+ if (!ebeam->irq) {
+ dev_dbg(&intf->dev,
+ "%s - usb_alloc_urb failed: ebeam->irq\n", __func__);
+ goto out_free_buffers;
+ }
+
+ ebeam->interface = intf;
+ ebeam->input = input_dev;
+
+ /* setup name */
+ snprintf(ebeam->name, sizeof(ebeam->name),
+ "USB eBeam %04x:%04x",
+ le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct));
+
+ if (udev->manufacturer || udev->product) {
+ strlcat(ebeam->name,
+ " (",
+ sizeof(ebeam->name));
+
+ if (udev->manufacturer)
+ strlcat(ebeam->name,
+ udev->manufacturer,
+ sizeof(ebeam->name));
+
+ if (udev->product) {
+ if (udev->manufacturer)
+ strlcat(ebeam->name,
+ " ",
+ sizeof(ebeam->name));
+ strlcat(ebeam->name,
+ udev->product,
+ sizeof(ebeam->name));
+ }
+
+ strlcat(ebeam->name, ")", sizeof(ebeam->name));
+ }
+
+ /* usb tree */
+ usb_make_path(udev, ebeam->phys, sizeof(ebeam->phys));
+ strlcat(ebeam->phys, "/input0", sizeof(ebeam->phys));
+
+ /* input setup */
+ input_dev->name = ebeam->name;
+ input_dev->phys = ebeam->phys;
+ usb_to_input_id(udev, &input_dev->id);
+ input_dev->dev.parent = &intf->dev;
+
+ input_set_drvdata(input_dev, ebeam);
+
+ input_dev->open = ebeam_open;
+ input_dev->close = ebeam_close;
+
+ /* usb urb setup */
+ if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
+ usb_fill_int_urb(ebeam->irq, udev,
+ usb_rcvintpipe(udev, endpoint->bEndpointAddress),
+ ebeam->data, type->rept_size,
+ ebeam_irq, ebeam, endpoint->bInterval);
+ else
+ usb_fill_bulk_urb(ebeam->irq, udev,
+ usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
+ ebeam->data, type->rept_size,
+ ebeam_irq, ebeam);
+
+ ebeam->irq->dev = udev;
+ ebeam->irq->transfer_dma = ebeam->data_dma;
+ ebeam->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ /* device specific allocations */
+ if (type->alloc) {
+ err = type->alloc(ebeam);
+ if (err) {
+ dev_dbg(&intf->dev,
+ "%s - type->alloc() failed, err: %d\n",
+ __func__, err);
+ goto out_free_urb;
+ }
+ }
+
+ /* device specific initialisation */
+ if (type->init) {
+ err = type->init(ebeam);
+ if (err) {
+ dev_dbg(&intf->dev,
+ "%s - type->init() failed, err: %d\n",
+ __func__, err);
+ goto out_do_exit;
+ }
+ }
+
+ /* input final setup */
+ err = input_register_device(ebeam->input);
+ if (err) {
+ dev_dbg(&intf->dev,
+ "%s - input_register_device failed, err: %d\n",
+ __func__, err);
+ goto out_do_exit;
+ }
+
+ type->setup_input(ebeam, input_dev);
+
+ /* usb final setup */
+ usb_set_intfdata(intf, ebeam);
+
+ if (ebeam->type->irq_always) {
+ /* this can't fail */
+ usb_autopm_get_interface(intf);
+ err = usb_submit_urb(ebeam->irq, GFP_KERNEL);
+ if (err) {
+ usb_autopm_put_interface(intf);
+ dev_err(&intf->dev,
+ "%s - usb_submit_urb failed with result: %d\n",
+ __func__, err);
+ goto out_unregister_input;
+ }
+ }
+
+ /* sysfs setup */
+ err = sysfs_create_group(&intf->dev.kobj, &ebeam_attr_group);
+ if (err) {
+ dev_dbg(&intf->dev,
+ "%s - cannot create sysfs group, err: %d\n",
+ __func__, err);
+ goto out_unregister_input;
+ }
+
+ return 0;
+
+out_unregister_input:
+ input_unregister_device(input_dev);
+ input_dev = NULL;
+out_do_exit:
+ if (type->exit)
+ type->exit(ebeam);
+out_free_urb:
+ usb_free_urb(ebeam->irq);
+out_free_buffers:
+ ebeam_free_buffers(udev, ebeam);
+out_free:
+ input_free_device(input_dev);
+ kfree(ebeam);
+ return err;
+}
+
+static void ebeam_disconnect(struct usb_interface *intf)
+{
+ struct ebeam_device *ebeam = usb_get_intfdata(intf);
+
+ if (!ebeam)
+ return;
+
+ dev_dbg(&intf->dev,
+ "%s - ebeam is initialized, cleaning up\n", __func__);
+
+ usb_set_intfdata(intf, NULL);
+ /* this will stop IO via close */
+ input_unregister_device(ebeam->input);
+ sysfs_remove_group(&intf->dev.kobj, &ebeam_attr_group);
+ usb_free_urb(ebeam->irq);
+ if (ebeam->type->exit)
+ ebeam->type->exit(ebeam);
+ ebeam_free_buffers(interface_to_usbdev(intf), ebeam);
+ kfree(ebeam);
+}
+
+MODULE_DEVICE_TABLE(usb, ebeam_devices);
+
+static struct usb_driver ebeam_driver = {
+ .name = "ebeam",
+ .probe = ebeam_probe,
+ .disconnect = ebeam_disconnect,
+ .suspend = ebeam_suspend,
+ .resume = ebeam_resume,
+ .reset_resume = ebeam_reset_resume,
+ .id_table = ebeam_devices,
+ .supports_autosuspend = 1,
+};
+
+module_usb_driver(ebeam_driver);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
--
1.7.10
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