![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>
289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
/*
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* Copyright (c) Intel Corp. 2007.
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* All Rights Reserved.
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*
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* Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
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* develop this driver.
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*
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* This file is part of the Carillo Ranch video subsystem driver.
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* The Carillo Ranch video subsystem driver is free software;
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* you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* The Carillo Ranch video subsystem driver is distributed
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* 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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* You should have received a copy of the GNU General Public License
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* along with this driver; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors:
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* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
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* Alan Hourihane <alanh-at-tungstengraphics-dot-com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/lcd.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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/* The LVDS- and panel power controls sits on the
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* GPIO port of the ISA bridge.
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*/
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#define CRVML_DEVICE_LPC 0x27B8
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#define CRVML_REG_GPIOBAR 0x48
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#define CRVML_REG_GPIOEN 0x4C
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#define CRVML_GPIOEN_BIT (1 << 4)
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#define CRVML_PANEL_PORT 0x38
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#define CRVML_LVDS_ON 0x00000001
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#define CRVML_PANEL_ON 0x00000002
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#define CRVML_BACKLIGHT_OFF 0x00000004
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/* The PLL Clock register sits on Host bridge */
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#define CRVML_DEVICE_MCH 0x5001
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#define CRVML_REG_MCHBAR 0x44
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#define CRVML_REG_MCHEN 0x54
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#define CRVML_MCHEN_BIT (1 << 28)
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#define CRVML_MCHMAP_SIZE 4096
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#define CRVML_REG_CLOCK 0xc3c
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#define CRVML_CLOCK_SHIFT 8
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#define CRVML_CLOCK_MASK 0x00000f00
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static struct pci_dev *lpc_dev;
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static u32 gpio_bar;
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struct cr_panel {
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struct backlight_device *cr_backlight_device;
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struct lcd_device *cr_lcd_device;
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};
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static int cr_backlight_set_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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if (bd->props.power == FB_BLANK_UNBLANK)
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intensity = FB_BLANK_UNBLANK;
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if (bd->props.fb_blank == FB_BLANK_UNBLANK)
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intensity = FB_BLANK_UNBLANK;
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if (bd->props.power == FB_BLANK_POWERDOWN)
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intensity = FB_BLANK_POWERDOWN;
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if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
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intensity = FB_BLANK_POWERDOWN;
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if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
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cur &= ~CRVML_BACKLIGHT_OFF;
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outl(cur, addr);
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} else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
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cur |= CRVML_BACKLIGHT_OFF;
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outl(cur, addr);
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} /* anything else, don't bother */
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return 0;
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}
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static int cr_backlight_get_intensity(struct backlight_device *bd)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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u8 intensity;
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if (cur & CRVML_BACKLIGHT_OFF)
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intensity = FB_BLANK_POWERDOWN;
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else
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intensity = FB_BLANK_UNBLANK;
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return intensity;
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}
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static const struct backlight_ops cr_backlight_ops = {
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.get_brightness = cr_backlight_get_intensity,
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.update_status = cr_backlight_set_intensity,
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};
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static void cr_panel_on(void)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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if (!(cur & CRVML_PANEL_ON)) {
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/* Make sure LVDS controller is down. */
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if (cur & 0x00000001) {
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cur &= ~CRVML_LVDS_ON;
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outl(cur, addr);
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}
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/* Power up Panel */
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schedule_timeout(HZ / 10);
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cur |= CRVML_PANEL_ON;
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outl(cur, addr);
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}
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/* Power up LVDS controller */
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if (!(cur & CRVML_LVDS_ON)) {
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schedule_timeout(HZ / 10);
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outl(cur | CRVML_LVDS_ON, addr);
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}
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}
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static void cr_panel_off(void)
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{
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u32 addr = gpio_bar + CRVML_PANEL_PORT;
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u32 cur = inl(addr);
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/* Power down LVDS controller first to avoid high currents */
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if (cur & CRVML_LVDS_ON) {
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cur &= ~CRVML_LVDS_ON;
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outl(cur, addr);
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}
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if (cur & CRVML_PANEL_ON) {
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schedule_timeout(HZ / 10);
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outl(cur & ~CRVML_PANEL_ON, addr);
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}
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}
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static int cr_lcd_set_power(struct lcd_device *ld, int power)
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{
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if (power == FB_BLANK_UNBLANK)
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cr_panel_on();
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if (power == FB_BLANK_POWERDOWN)
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cr_panel_off();
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return 0;
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}
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static struct lcd_ops cr_lcd_ops = {
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.set_power = cr_lcd_set_power,
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};
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static int cr_backlight_probe(struct platform_device *pdev)
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{
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struct backlight_properties props;
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struct backlight_device *bdp;
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struct lcd_device *ldp;
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struct cr_panel *crp;
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u8 dev_en;
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lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
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CRVML_DEVICE_LPC, NULL);
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if (!lpc_dev) {
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printk("INTEL CARILLO RANCH LPC not found.\n");
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return -ENODEV;
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}
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pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
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if (!(dev_en & CRVML_GPIOEN_BIT)) {
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printk(KERN_ERR
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"Carillo Ranch GPIO device was not enabled.\n");
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pci_dev_put(lpc_dev);
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return -ENODEV;
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}
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memset(&props, 0, sizeof(struct backlight_properties));
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bdp = backlight_device_register("cr-backlight", &pdev->dev, NULL,
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&cr_backlight_ops, &props);
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if (IS_ERR(bdp)) {
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pci_dev_put(lpc_dev);
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return PTR_ERR(bdp);
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}
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ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops);
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if (IS_ERR(ldp)) {
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backlight_device_unregister(bdp);
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pci_dev_put(lpc_dev);
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return PTR_ERR(ldp);
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}
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pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
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&gpio_bar);
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gpio_bar &= ~0x3F;
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crp = kzalloc(sizeof(*crp), GFP_KERNEL);
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if (!crp) {
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lcd_device_unregister(ldp);
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backlight_device_unregister(bdp);
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pci_dev_put(lpc_dev);
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return -ENOMEM;
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}
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crp->cr_backlight_device = bdp;
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crp->cr_lcd_device = ldp;
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crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
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crp->cr_backlight_device->props.brightness = 0;
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cr_backlight_set_intensity(crp->cr_backlight_device);
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cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
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platform_set_drvdata(pdev, crp);
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return 0;
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}
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static int cr_backlight_remove(struct platform_device *pdev)
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{
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struct cr_panel *crp = platform_get_drvdata(pdev);
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crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
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crp->cr_backlight_device->props.brightness = 0;
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crp->cr_backlight_device->props.max_brightness = 0;
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cr_backlight_set_intensity(crp->cr_backlight_device);
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cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
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backlight_device_unregister(crp->cr_backlight_device);
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lcd_device_unregister(crp->cr_lcd_device);
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pci_dev_put(lpc_dev);
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return 0;
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}
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static struct platform_driver cr_backlight_driver = {
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.probe = cr_backlight_probe,
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.remove = cr_backlight_remove,
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.driver = {
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.name = "cr_backlight",
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},
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};
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static struct platform_device *crp;
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static int __init cr_backlight_init(void)
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{
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int ret = platform_driver_register(&cr_backlight_driver);
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if (ret)
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return ret;
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crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
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if (IS_ERR(crp)) {
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platform_driver_unregister(&cr_backlight_driver);
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return PTR_ERR(crp);
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}
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printk("Carillo Ranch Backlight Driver Initialized.\n");
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return 0;
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}
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static void __exit cr_backlight_exit(void)
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{
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platform_device_unregister(crp);
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platform_driver_unregister(&cr_backlight_driver);
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}
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module_init(cr_backlight_init);
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module_exit(cr_backlight_exit);
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MODULE_AUTHOR("Tungsten Graphics Inc.");
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MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
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MODULE_LICENSE("GPL");
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