![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>
400 lines
11 KiB
C
400 lines
11 KiB
C
/* drivers/input/misc/gpio_matrix.c
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*
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* Copyright (C) 2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/gpio_event.h>
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#include <linux/hrtimer.h>
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#include <linux/interrupt.h>
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struct gpio_kp {
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struct input_dev *input_dev;
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struct gpio_event_matrix_info *keypad_info;
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struct hrtimer timer;
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int current_output;
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unsigned int use_irq:1;
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unsigned int key_state_changed:1;
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unsigned int last_key_state_changed:1;
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unsigned int some_keys_pressed:2;
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unsigned long keys_pressed[0];
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};
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static void clear_phantom_key(struct gpio_kp *kp, int out, int in)
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{
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struct gpio_event_matrix_info *mi = kp->keypad_info;
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int key_index = out * mi->ninputs + in;
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unsigned short keycode = mi->keymap[key_index];;
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if (!test_bit(keycode, kp->input_dev->key)) {
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if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
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pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
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"cleared\n", keycode, out, in,
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mi->output_gpios[out], mi->input_gpios[in]);
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__clear_bit(key_index, kp->keys_pressed);
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} else {
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if (mi->flags & GPIOKPF_PRINT_PHANTOM_KEYS)
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pr_info("gpiomatrix: phantom key %x, %d-%d (%d-%d) "
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"not cleared\n", keycode, out, in,
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mi->output_gpios[out], mi->input_gpios[in]);
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}
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}
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static int restore_keys_for_input(struct gpio_kp *kp, int out, int in)
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{
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int rv = 0;
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int key_index;
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key_index = out * kp->keypad_info->ninputs + in;
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while (out < kp->keypad_info->noutputs) {
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if (test_bit(key_index, kp->keys_pressed)) {
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rv = 1;
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clear_phantom_key(kp, out, in);
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}
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key_index += kp->keypad_info->ninputs;
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out++;
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}
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return rv;
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}
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static void remove_phantom_keys(struct gpio_kp *kp)
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{
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int out, in, inp;
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int key_index;
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if (kp->some_keys_pressed < 3)
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return;
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for (out = 0; out < kp->keypad_info->noutputs; out++) {
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inp = -1;
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key_index = out * kp->keypad_info->ninputs;
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for (in = 0; in < kp->keypad_info->ninputs; in++, key_index++) {
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if (test_bit(key_index, kp->keys_pressed)) {
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if (inp == -1) {
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inp = in;
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continue;
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}
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if (inp >= 0) {
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if (!restore_keys_for_input(kp, out + 1,
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inp))
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break;
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clear_phantom_key(kp, out, inp);
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inp = -2;
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}
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restore_keys_for_input(kp, out, in);
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}
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}
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}
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}
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static void report_key(struct gpio_kp *kp, int key_index, int out, int in)
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{
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struct gpio_event_matrix_info *mi = kp->keypad_info;
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int pressed = test_bit(key_index, kp->keys_pressed);
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unsigned short keycode = mi->keymap[key_index];
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if (pressed != test_bit(keycode, kp->input_dev->key)) {
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if (keycode == KEY_RESERVED) {
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if (mi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS)
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pr_info("gpiomatrix: unmapped key, %d-%d "
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"(%d-%d) changed to %d\n",
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out, in, mi->output_gpios[out],
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mi->input_gpios[in], pressed);
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} else {
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if (mi->flags & GPIOKPF_PRINT_MAPPED_KEYS)
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pr_info("gpiomatrix: key %x, %d-%d (%d-%d) "
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"changed to %d\n", keycode,
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out, in, mi->output_gpios[out],
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mi->input_gpios[in], pressed);
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input_report_key(kp->input_dev, keycode, pressed);
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}
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}
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}
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static enum hrtimer_restart gpio_keypad_timer_func(struct hrtimer *timer)
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{
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int out, in;
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int key_index;
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int gpio;
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struct gpio_kp *kp = container_of(timer, struct gpio_kp, timer);
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struct gpio_event_matrix_info *mi = kp->keypad_info;
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unsigned gpio_keypad_flags = mi->flags;
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unsigned polarity = !!(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH);
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out = kp->current_output;
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if (out == mi->noutputs) {
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out = 0;
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kp->last_key_state_changed = kp->key_state_changed;
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kp->key_state_changed = 0;
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kp->some_keys_pressed = 0;
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} else {
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key_index = out * mi->ninputs;
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for (in = 0; in < mi->ninputs; in++, key_index++) {
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gpio = mi->input_gpios[in];
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if (gpio_get_value(gpio) ^ !polarity) {
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if (kp->some_keys_pressed < 3)
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kp->some_keys_pressed++;
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kp->key_state_changed |= !__test_and_set_bit(
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key_index, kp->keys_pressed);
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} else
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kp->key_state_changed |= __test_and_clear_bit(
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key_index, kp->keys_pressed);
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}
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gpio = mi->output_gpios[out];
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if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
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gpio_set_value(gpio, !polarity);
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else
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gpio_direction_input(gpio);
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out++;
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}
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kp->current_output = out;
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if (out < mi->noutputs) {
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gpio = mi->output_gpios[out];
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if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
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gpio_set_value(gpio, polarity);
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else
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gpio_direction_output(gpio, polarity);
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hrtimer_start(timer, mi->settle_time, HRTIMER_MODE_REL);
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return HRTIMER_NORESTART;
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}
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if (gpio_keypad_flags & GPIOKPF_DEBOUNCE) {
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if (kp->key_state_changed) {
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hrtimer_start(&kp->timer, mi->debounce_delay,
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HRTIMER_MODE_REL);
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return HRTIMER_NORESTART;
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}
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kp->key_state_changed = kp->last_key_state_changed;
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}
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if (kp->key_state_changed) {
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if (gpio_keypad_flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS)
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remove_phantom_keys(kp);
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key_index = 0;
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for (out = 0; out < mi->noutputs; out++)
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for (in = 0; in < mi->ninputs; in++, key_index++)
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report_key(kp, key_index, out, in);
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}
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if (!kp->use_irq || kp->some_keys_pressed) {
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hrtimer_start(timer, mi->poll_time, HRTIMER_MODE_REL);
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return HRTIMER_NORESTART;
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}
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/* No keys are pressed, reenable interrupt */
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for (out = 0; out < mi->noutputs; out++) {
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if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
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gpio_set_value(mi->output_gpios[out], polarity);
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else
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gpio_direction_output(mi->output_gpios[out], polarity);
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}
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for (in = 0; in < mi->ninputs; in++)
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enable_irq(gpio_to_irq(mi->input_gpios[in]));
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return HRTIMER_NORESTART;
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}
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static irqreturn_t gpio_keypad_irq_handler(int irq_in, void *dev_id)
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{
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int i;
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struct gpio_kp *kp = dev_id;
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struct gpio_event_matrix_info *mi = kp->keypad_info;
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unsigned gpio_keypad_flags = mi->flags;
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if (!kp->use_irq) /* ignore interrupt while registering the handler */
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return IRQ_HANDLED;
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for (i = 0; i < mi->ninputs; i++)
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disable_irq(gpio_to_irq(mi->input_gpios[i]));
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for (i = 0; i < mi->noutputs; i++) {
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if (gpio_keypad_flags & GPIOKPF_DRIVE_INACTIVE)
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gpio_set_value(mi->output_gpios[i],
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!(gpio_keypad_flags & GPIOKPF_ACTIVE_HIGH));
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else
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gpio_direction_input(mi->output_gpios[i]);
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}
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hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
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return IRQ_HANDLED;
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}
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static int gpio_keypad_request_irqs(struct gpio_kp *kp)
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{
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int i;
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int err;
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unsigned int irq;
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unsigned long request_flags;
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struct gpio_event_matrix_info *mi = kp->keypad_info;
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switch (mi->flags & (GPIOKPF_ACTIVE_HIGH|GPIOKPF_LEVEL_TRIGGERED_IRQ)) {
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default:
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request_flags = IRQF_TRIGGER_FALLING;
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break;
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case GPIOKPF_ACTIVE_HIGH:
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request_flags = IRQF_TRIGGER_RISING;
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break;
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case GPIOKPF_LEVEL_TRIGGERED_IRQ:
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request_flags = IRQF_TRIGGER_LOW;
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break;
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case GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_ACTIVE_HIGH:
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request_flags = IRQF_TRIGGER_HIGH;
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break;
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}
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for (i = 0; i < mi->ninputs; i++) {
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err = irq = gpio_to_irq(mi->input_gpios[i]);
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if (err < 0)
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goto err_gpio_get_irq_num_failed;
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err = request_irq(irq, gpio_keypad_irq_handler, request_flags,
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"gpio_kp", kp);
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if (err) {
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pr_err("gpiomatrix: request_irq failed for input %d, "
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"irq %d\n", mi->input_gpios[i], irq);
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goto err_request_irq_failed;
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}
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err = set_irq_wake(irq, 1);
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if (err) {
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pr_err("gpiomatrix: set_irq_wake failed for input %d, "
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"irq %d\n", mi->input_gpios[i], irq);
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}
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disable_irq(irq);
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}
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return 0;
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for (i = mi->noutputs - 1; i >= 0; i--) {
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free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
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err_request_irq_failed:
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err_gpio_get_irq_num_failed:
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;
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}
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return err;
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}
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int gpio_event_matrix_func(struct input_dev *input_dev,
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struct gpio_event_info *info, void **data, int func)
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{
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int i;
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int err;
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int key_count;
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struct gpio_kp *kp;
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struct gpio_event_matrix_info *mi;
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mi = container_of(info, struct gpio_event_matrix_info, info);
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if (func == GPIO_EVENT_FUNC_SUSPEND || func == GPIO_EVENT_FUNC_RESUME) {
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/* TODO: disable scanning */
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return 0;
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}
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if (func == GPIO_EVENT_FUNC_INIT) {
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if (mi->keymap == NULL ||
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mi->input_gpios == NULL ||
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mi->output_gpios == NULL) {
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err = -ENODEV;
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pr_err("gpiomatrix: Incomplete pdata\n");
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goto err_invalid_platform_data;
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}
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key_count = mi->ninputs * mi->noutputs;
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*data = kp = kzalloc(sizeof(*kp) + sizeof(kp->keys_pressed[0]) *
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BITS_TO_LONGS(key_count), GFP_KERNEL);
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if (kp == NULL) {
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err = -ENOMEM;
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pr_err("gpiomatrix: Failed to allocate private data\n");
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goto err_kp_alloc_failed;
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}
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kp->input_dev = input_dev;
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kp->keypad_info = mi;
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set_bit(EV_KEY, input_dev->evbit);
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for (i = 0; i < key_count; i++) {
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if (mi->keymap[i])
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set_bit(mi->keymap[i] & KEY_MAX,
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input_dev->keybit);
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}
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for (i = 0; i < mi->noutputs; i++) {
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if (gpio_cansleep(mi->output_gpios[i])) {
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pr_err("gpiomatrix: unsupported output gpio %d,"
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" can sleep\n", mi->output_gpios[i]);
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err = -EINVAL;
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goto err_request_output_gpio_failed;
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}
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err = gpio_request(mi->output_gpios[i], "gpio_kp_out");
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if (err) {
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pr_err("gpiomatrix: gpio_request failed for "
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"output %d\n", mi->output_gpios[i]);
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goto err_request_output_gpio_failed;
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}
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if (mi->flags & GPIOKPF_DRIVE_INACTIVE)
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err = gpio_direction_output(mi->output_gpios[i],
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!(mi->flags & GPIOKPF_ACTIVE_HIGH));
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else
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err = gpio_direction_input(mi->output_gpios[i]);
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if (err) {
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pr_err("gpiomatrix: gpio_configure failed for "
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"output %d\n", mi->output_gpios[i]);
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goto err_output_gpio_configure_failed;
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}
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}
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for (i = 0; i < mi->ninputs; i++) {
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err = gpio_request(mi->input_gpios[i], "gpio_kp_in");
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if (err) {
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pr_err("gpiomatrix: gpio_request failed for "
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"input %d\n", mi->input_gpios[i]);
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goto err_request_input_gpio_failed;
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}
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err = gpio_direction_input(mi->input_gpios[i]);
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if (err) {
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pr_err("gpiomatrix: gpio_direction_input failed"
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" for input %d\n", mi->input_gpios[i]);
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goto err_gpio_direction_input_failed;
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}
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}
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kp->current_output = mi->noutputs;
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kp->key_state_changed = 1;
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hrtimer_init(&kp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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kp->timer.function = gpio_keypad_timer_func;
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err = gpio_keypad_request_irqs(kp);
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kp->use_irq = err == 0;
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pr_info("GPIO Matrix Keypad Driver: Start keypad matrix for %s "
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"in %s mode\n", input_dev->name,
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kp->use_irq ? "interrupt" : "polling");
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hrtimer_start(&kp->timer, ktime_set(0, 0), HRTIMER_MODE_REL);
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return 0;
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}
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err = 0;
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kp = *data;
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if (kp->use_irq)
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for (i = mi->noutputs - 1; i >= 0; i--)
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free_irq(gpio_to_irq(mi->input_gpios[i]), kp);
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hrtimer_cancel(&kp->timer);
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for (i = mi->noutputs - 1; i >= 0; i--) {
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err_gpio_direction_input_failed:
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gpio_free(mi->input_gpios[i]);
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err_request_input_gpio_failed:
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;
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}
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for (i = mi->noutputs - 1; i >= 0; i--) {
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err_output_gpio_configure_failed:
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gpio_free(mi->output_gpios[i]);
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err_request_output_gpio_failed:
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;
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}
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kfree(kp);
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err_kp_alloc_failed:
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err_invalid_platform_data:
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return err;
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}
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