![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
292 lines
6.7 KiB
C
292 lines
6.7 KiB
C
/*
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* HID driver for 3M PCT multitouch panels
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*
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* Copyright (c) 2009 Stephane Chatty <chatty@enac.fr>
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*
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
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MODULE_DESCRIPTION("3M PCT multitouch panels");
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MODULE_LICENSE("GPL");
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#include "hid-ids.h"
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struct mmm_finger {
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__s32 x, y;
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__u8 rank;
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bool touch, valid;
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};
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struct mmm_data {
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struct mmm_finger f[10];
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__u8 curid, num;
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bool touch, valid;
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};
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static int mmm_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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switch (usage->hid & HID_USAGE_PAGE) {
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case HID_UP_BUTTON:
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return -1;
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case HID_UP_GENDESK:
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switch (usage->hid) {
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case HID_GD_X:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_X);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_X,
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field->logical_minimum,
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field->logical_maximum, 0, 0);
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return 1;
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case HID_GD_Y:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_Y);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_Y,
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field->logical_minimum,
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field->logical_maximum, 0, 0);
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return 1;
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}
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return 0;
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case HID_UP_DIGITIZER:
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switch (usage->hid) {
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/* we do not want to map these: no input-oriented meaning */
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case 0x14:
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case 0x23:
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case HID_DG_INPUTMODE:
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case HID_DG_DEVICEINDEX:
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case HID_DG_CONTACTCOUNT:
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case HID_DG_CONTACTMAX:
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case HID_DG_INRANGE:
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case HID_DG_CONFIDENCE:
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return -1;
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case HID_DG_TIPSWITCH:
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/* touchscreen emulation */
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hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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return 1;
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case HID_DG_CONTACTID:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_TRACKING_ID);
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return 1;
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}
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/* let hid-input decide for the others */
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return 0;
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case 0xff000000:
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/* we do not want to map these: no input-oriented meaning */
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return -1;
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}
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return 0;
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}
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static int mmm_input_mapped(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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if (usage->type == EV_KEY || usage->type == EV_ABS)
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clear_bit(usage->code, *bit);
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return 0;
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}
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/*
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* this function is called when a whole packet has been received and processed,
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* so that it can decide what to send to the input layer.
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*/
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static void mmm_filter_event(struct mmm_data *md, struct input_dev *input)
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{
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struct mmm_finger *oldest = 0;
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bool pressed = false, released = false;
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int i;
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/*
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* we need to iterate on all fingers to decide if we have a press
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* or a release event in our touchscreen emulation.
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*/
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for (i = 0; i < 10; ++i) {
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struct mmm_finger *f = &md->f[i];
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if (!f->valid) {
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/* this finger is just placeholder data, ignore */
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} else if (f->touch) {
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/* this finger is on the screen */
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input_event(input, EV_ABS, ABS_MT_TRACKING_ID, i);
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input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
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input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
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input_mt_sync(input);
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/*
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* touchscreen emulation: maintain the age rank
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* of this finger, decide if we have a press
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*/
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if (f->rank == 0) {
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f->rank = ++(md->num);
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if (f->rank == 1)
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pressed = true;
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}
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if (f->rank == 1)
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oldest = f;
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} else {
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/* this finger took off the screen */
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/* touchscreen emulation: maintain age rank of others */
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int j;
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for (j = 0; j < 10; ++j) {
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struct mmm_finger *g = &md->f[j];
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if (g->rank > f->rank) {
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g->rank--;
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if (g->rank == 1)
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oldest = g;
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}
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}
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f->rank = 0;
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--(md->num);
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if (md->num == 0)
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released = true;
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}
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f->valid = 0;
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}
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/* touchscreen emulation */
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if (oldest) {
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if (pressed)
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input_event(input, EV_KEY, BTN_TOUCH, 1);
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input_event(input, EV_ABS, ABS_X, oldest->x);
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input_event(input, EV_ABS, ABS_Y, oldest->y);
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} else if (released) {
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input_event(input, EV_KEY, BTN_TOUCH, 0);
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}
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}
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/*
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* this function is called upon all reports
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* so that we can accumulate contact point information,
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* and call input_mt_sync after each point.
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*/
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static int mmm_event(struct hid_device *hid, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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struct mmm_data *md = hid_get_drvdata(hid);
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/*
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* strangely, this function can be called before
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* field->hidinput is initialized!
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*/
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if (hid->claimed & HID_CLAIMED_INPUT) {
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struct input_dev *input = field->hidinput->input;
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switch (usage->hid) {
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case HID_DG_TIPSWITCH:
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md->touch = value;
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break;
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case HID_DG_CONFIDENCE:
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md->valid = value;
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break;
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case HID_DG_CONTACTID:
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if (md->valid) {
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md->curid = value;
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md->f[value].touch = md->touch;
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md->f[value].valid = 1;
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}
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break;
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case HID_GD_X:
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if (md->valid)
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md->f[md->curid].x = value;
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break;
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case HID_GD_Y:
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if (md->valid)
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md->f[md->curid].y = value;
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break;
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case HID_DG_CONTACTCOUNT:
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mmm_filter_event(md, input);
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break;
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}
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}
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/* we have handled the hidinput part, now remains hiddev */
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if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
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hid->hiddev_hid_event(hid, field, usage, value);
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return 1;
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}
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static int mmm_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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struct mmm_data *md;
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md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
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if (!md) {
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dev_err(&hdev->dev, "cannot allocate 3M data\n");
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return -ENOMEM;
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}
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hid_set_drvdata(hdev, md);
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ret = hid_parse(hdev);
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if (!ret)
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret)
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kfree(md);
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return ret;
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}
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static void mmm_remove(struct hid_device *hdev)
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{
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hid_hw_stop(hdev);
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kfree(hid_get_drvdata(hdev));
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hid_set_drvdata(hdev, NULL);
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}
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static const struct hid_device_id mmm_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, mmm_devices);
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static const struct hid_usage_id mmm_grabbed_usages[] = {
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{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
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{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
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};
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static struct hid_driver mmm_driver = {
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.name = "3m-pct",
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.id_table = mmm_devices,
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.probe = mmm_probe,
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.remove = mmm_remove,
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.input_mapping = mmm_input_mapping,
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.input_mapped = mmm_input_mapped,
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.usage_table = mmm_grabbed_usages,
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.event = mmm_event,
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};
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static int __init mmm_init(void)
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{
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return hid_register_driver(&mmm_driver);
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}
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static void __exit mmm_exit(void)
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{
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hid_unregister_driver(&mmm_driver);
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}
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module_init(mmm_init);
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module_exit(mmm_exit);
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MODULE_LICENSE("GPL");
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