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![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>
218 lines
5 KiB
C
218 lines
5 KiB
C
/*
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* LEDs driver for LT3593 controllers
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*
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* See the datasheet at http://cds.linear.com/docs/Datasheet/3593f.pdf
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*
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* Based on leds-gpio.c,
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*
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* Copyright (C) 2007 8D Technologies inc.
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* Raphael Assenat <raph@8d.com>
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* Copyright (C) 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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/leds.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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struct lt3593_led_data {
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struct led_classdev cdev;
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unsigned gpio;
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struct work_struct work;
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u8 new_level;
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};
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static void lt3593_led_work(struct work_struct *work)
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{
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int pulses;
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struct lt3593_led_data *led_dat =
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container_of(work, struct lt3593_led_data, work);
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/*
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* The LT3593 resets its internal current level register to the maximum
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* level on the first falling edge on the control pin. Each following
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* falling edge decreases the current level by 625uA. Up to 32 pulses
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* can be sent, so the maximum power reduction is 20mA.
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* After a timeout of 128us, the value is taken from the register and
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* applied is to the output driver.
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*/
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if (led_dat->new_level == 0) {
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gpio_set_value_cansleep(led_dat->gpio, 0);
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return;
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}
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pulses = 32 - (led_dat->new_level * 32) / 255;
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if (pulses == 0) {
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gpio_set_value_cansleep(led_dat->gpio, 0);
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mdelay(1);
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gpio_set_value_cansleep(led_dat->gpio, 1);
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return;
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}
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gpio_set_value_cansleep(led_dat->gpio, 1);
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while (pulses--) {
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gpio_set_value_cansleep(led_dat->gpio, 0);
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udelay(1);
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gpio_set_value_cansleep(led_dat->gpio, 1);
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udelay(1);
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}
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}
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static void lt3593_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct lt3593_led_data *led_dat =
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container_of(led_cdev, struct lt3593_led_data, cdev);
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led_dat->new_level = value;
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schedule_work(&led_dat->work);
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}
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static int __devinit create_lt3593_led(const struct gpio_led *template,
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struct lt3593_led_data *led_dat, struct device *parent)
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{
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int ret, state;
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/* skip leds on GPIOs that aren't available */
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if (!gpio_is_valid(template->gpio)) {
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printk(KERN_INFO "%s: skipping unavailable LT3593 LED at gpio %d (%s)\n",
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KBUILD_MODNAME, template->gpio, template->name);
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return 0;
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}
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ret = gpio_request(template->gpio, template->name);
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if (ret < 0)
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return ret;
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led_dat->cdev.name = template->name;
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led_dat->cdev.default_trigger = template->default_trigger;
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led_dat->gpio = template->gpio;
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led_dat->cdev.brightness_set = lt3593_led_set;
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state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
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led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
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if (!template->retain_state_suspended)
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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ret = gpio_direction_output(led_dat->gpio, state);
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if (ret < 0)
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goto err;
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INIT_WORK(&led_dat->work, lt3593_led_work);
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ret = led_classdev_register(parent, &led_dat->cdev);
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if (ret < 0)
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goto err;
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printk(KERN_INFO "%s: registered LT3593 LED '%s' at GPIO %d\n",
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KBUILD_MODNAME, template->name, template->gpio);
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return 0;
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err:
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gpio_free(led_dat->gpio);
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return ret;
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}
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static void delete_lt3593_led(struct lt3593_led_data *led)
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{
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if (!gpio_is_valid(led->gpio))
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return;
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led_classdev_unregister(&led->cdev);
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cancel_work_sync(&led->work);
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gpio_free(led->gpio);
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}
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static int __devinit lt3593_led_probe(struct platform_device *pdev)
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{
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struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
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struct lt3593_led_data *leds_data;
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int i, ret = 0;
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if (!pdata)
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return -EBUSY;
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leds_data = kzalloc(sizeof(struct lt3593_led_data) * pdata->num_leds,
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GFP_KERNEL);
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if (!leds_data)
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return -ENOMEM;
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for (i = 0; i < pdata->num_leds; i++) {
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ret = create_lt3593_led(&pdata->leds[i], &leds_data[i],
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&pdev->dev);
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if (ret < 0)
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goto err;
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}
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platform_set_drvdata(pdev, leds_data);
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return 0;
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err:
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for (i = i - 1; i >= 0; i--)
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delete_lt3593_led(&leds_data[i]);
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kfree(leds_data);
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return ret;
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}
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static int __devexit lt3593_led_remove(struct platform_device *pdev)
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{
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int i;
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struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
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struct lt3593_led_data *leds_data;
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leds_data = platform_get_drvdata(pdev);
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for (i = 0; i < pdata->num_leds; i++)
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delete_lt3593_led(&leds_data[i]);
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kfree(leds_data);
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return 0;
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}
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static struct platform_driver lt3593_led_driver = {
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.probe = lt3593_led_probe,
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.remove = __devexit_p(lt3593_led_remove),
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.driver = {
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.name = "leds-lt3593",
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS("platform:leds-lt3593");
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static int __init lt3593_led_init(void)
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{
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return platform_driver_register(<3593_led_driver);
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}
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static void __exit lt3593_led_exit(void)
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{
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platform_driver_unregister(<3593_led_driver);
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}
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module_init(lt3593_led_init);
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module_exit(lt3593_led_exit);
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
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MODULE_DESCRIPTION("LED driver for LT3593 controllers");
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MODULE_LICENSE("GPL");
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