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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>
357 lines
9.2 KiB
C
357 lines
9.2 KiB
C
/*
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* gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices
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*
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* Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
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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/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/usb.h>
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#include <linux/workqueue.h>
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#include <linux/regulator/consumer.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/gpio_vbus.h>
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#include <linux/usb/otg.h>
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/*
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* A simple GPIO VBUS sensing driver for B peripheral only devices
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* with internal transceivers. It can control a D+ pullup GPIO and
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* a regulator to limit the current drawn from VBUS.
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*
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* Needs to be loaded before the UDC driver that will use it.
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*/
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struct gpio_vbus_data {
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struct otg_transceiver otg;
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struct device *dev;
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struct regulator *vbus_draw;
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int vbus_draw_enabled;
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unsigned mA;
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struct work_struct work;
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};
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/*
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* This driver relies on "both edges" triggering. VBUS has 100 msec to
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* stabilize, so the peripheral controller driver may need to cope with
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* some bouncing due to current surges (e.g. charging local capacitance)
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* and contact chatter.
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*
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* REVISIT in desperate straits, toggling between rising and falling
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* edges might be workable.
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*/
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#define VBUS_IRQ_FLAGS \
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( IRQF_SAMPLE_RANDOM | IRQF_SHARED \
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| IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING )
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/* interface to regulator framework */
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static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
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{
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struct regulator *vbus_draw = gpio_vbus->vbus_draw;
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int enabled;
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if (!vbus_draw)
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return;
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enabled = gpio_vbus->vbus_draw_enabled;
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if (mA) {
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regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
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if (!enabled) {
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regulator_enable(vbus_draw);
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gpio_vbus->vbus_draw_enabled = 1;
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}
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} else {
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if (enabled) {
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regulator_disable(vbus_draw);
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gpio_vbus->vbus_draw_enabled = 0;
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}
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}
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gpio_vbus->mA = mA;
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}
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static int is_vbus_powered(struct gpio_vbus_mach_info *pdata)
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{
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int vbus;
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vbus = gpio_get_value(pdata->gpio_vbus);
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if (pdata->gpio_vbus_inverted)
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vbus = !vbus;
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return vbus;
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}
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static void gpio_vbus_work(struct work_struct *work)
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{
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struct gpio_vbus_data *gpio_vbus =
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container_of(work, struct gpio_vbus_data, work);
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struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
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int gpio;
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if (!gpio_vbus->otg.gadget)
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return;
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/* Peripheral controllers which manage the pullup themselves won't have
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* gpio_pullup configured here. If it's configured here, we'll do what
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* isp1301_omap::b_peripheral() does and enable the pullup here... although
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* that may complicate usb_gadget_{,dis}connect() support.
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*/
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gpio = pdata->gpio_pullup;
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if (is_vbus_powered(pdata)) {
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gpio_vbus->otg.state = OTG_STATE_B_PERIPHERAL;
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usb_gadget_vbus_connect(gpio_vbus->otg.gadget);
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/* drawing a "unit load" is *always* OK, except for OTG */
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set_vbus_draw(gpio_vbus, 100);
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/* optionally enable D+ pullup */
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if (gpio_is_valid(gpio))
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gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
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} else {
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/* optionally disable D+ pullup */
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if (gpio_is_valid(gpio))
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gpio_set_value(gpio, pdata->gpio_pullup_inverted);
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set_vbus_draw(gpio_vbus, 0);
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usb_gadget_vbus_disconnect(gpio_vbus->otg.gadget);
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gpio_vbus->otg.state = OTG_STATE_B_IDLE;
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}
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}
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/* VBUS change IRQ handler */
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static irqreturn_t gpio_vbus_irq(int irq, void *data)
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{
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struct platform_device *pdev = data;
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struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
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struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
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dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
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is_vbus_powered(pdata) ? "supplied" : "inactive",
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gpio_vbus->otg.gadget ? gpio_vbus->otg.gadget->name : "none");
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if (gpio_vbus->otg.gadget)
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schedule_work(&gpio_vbus->work);
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return IRQ_HANDLED;
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}
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/* OTG transceiver interface */
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/* bind/unbind the peripheral controller */
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static int gpio_vbus_set_peripheral(struct otg_transceiver *otg,
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struct usb_gadget *gadget)
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{
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struct gpio_vbus_data *gpio_vbus;
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struct gpio_vbus_mach_info *pdata;
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struct platform_device *pdev;
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int gpio, irq;
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gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
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pdev = to_platform_device(gpio_vbus->dev);
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pdata = gpio_vbus->dev->platform_data;
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irq = gpio_to_irq(pdata->gpio_vbus);
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gpio = pdata->gpio_pullup;
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if (!gadget) {
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dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
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otg->gadget->name);
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/* optionally disable D+ pullup */
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if (gpio_is_valid(gpio))
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gpio_set_value(gpio, pdata->gpio_pullup_inverted);
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set_vbus_draw(gpio_vbus, 0);
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usb_gadget_vbus_disconnect(otg->gadget);
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otg->state = OTG_STATE_UNDEFINED;
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otg->gadget = NULL;
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return 0;
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}
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otg->gadget = gadget;
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dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);
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/* initialize connection state */
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gpio_vbus_irq(irq, pdev);
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return 0;
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}
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/* effective for B devices, ignored for A-peripheral */
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static int gpio_vbus_set_power(struct otg_transceiver *otg, unsigned mA)
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{
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struct gpio_vbus_data *gpio_vbus;
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gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
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if (otg->state == OTG_STATE_B_PERIPHERAL)
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set_vbus_draw(gpio_vbus, mA);
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return 0;
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}
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/* for non-OTG B devices: set/clear transceiver suspend mode */
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static int gpio_vbus_set_suspend(struct otg_transceiver *otg, int suspend)
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{
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struct gpio_vbus_data *gpio_vbus;
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gpio_vbus = container_of(otg, struct gpio_vbus_data, otg);
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/* draw max 0 mA from vbus in suspend mode; or the previously
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* recorded amount of current if not suspended
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*
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* NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
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* if they're wake-enabled ... we don't handle that yet.
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*/
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return gpio_vbus_set_power(otg, suspend ? 0 : gpio_vbus->mA);
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}
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/* platform driver interface */
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static int __init gpio_vbus_probe(struct platform_device *pdev)
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{
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struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
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struct gpio_vbus_data *gpio_vbus;
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struct resource *res;
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int err, gpio, irq;
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if (!pdata || !gpio_is_valid(pdata->gpio_vbus))
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return -EINVAL;
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gpio = pdata->gpio_vbus;
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gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
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if (!gpio_vbus)
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return -ENOMEM;
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platform_set_drvdata(pdev, gpio_vbus);
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gpio_vbus->dev = &pdev->dev;
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gpio_vbus->otg.label = "gpio-vbus";
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gpio_vbus->otg.state = OTG_STATE_UNDEFINED;
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gpio_vbus->otg.set_peripheral = gpio_vbus_set_peripheral;
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gpio_vbus->otg.set_power = gpio_vbus_set_power;
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gpio_vbus->otg.set_suspend = gpio_vbus_set_suspend;
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err = gpio_request(gpio, "vbus_detect");
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if (err) {
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dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
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gpio, err);
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goto err_gpio;
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}
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gpio_direction_input(gpio);
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (res) {
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irq = res->start;
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res->flags &= IRQF_TRIGGER_MASK;
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res->flags |= IRQF_SAMPLE_RANDOM | IRQF_SHARED;
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} else
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irq = gpio_to_irq(gpio);
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/* if data line pullup is in use, initialize it to "not pulling up" */
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gpio = pdata->gpio_pullup;
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if (gpio_is_valid(gpio)) {
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err = gpio_request(gpio, "udc_pullup");
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if (err) {
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dev_err(&pdev->dev,
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"can't request pullup gpio %d, err: %d\n",
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gpio, err);
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gpio_free(pdata->gpio_vbus);
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goto err_gpio;
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}
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gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
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}
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err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
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"vbus_detect", pdev);
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if (err) {
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dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
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irq, err);
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goto err_irq;
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}
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INIT_WORK(&gpio_vbus->work, gpio_vbus_work);
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/* only active when a gadget is registered */
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err = otg_set_transceiver(&gpio_vbus->otg);
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if (err) {
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dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
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err);
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goto err_otg;
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}
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gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
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if (IS_ERR(gpio_vbus->vbus_draw)) {
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dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
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PTR_ERR(gpio_vbus->vbus_draw));
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gpio_vbus->vbus_draw = NULL;
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}
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return 0;
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err_otg:
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free_irq(irq, &pdev->dev);
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err_irq:
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if (gpio_is_valid(pdata->gpio_pullup))
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gpio_free(pdata->gpio_pullup);
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gpio_free(pdata->gpio_vbus);
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err_gpio:
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platform_set_drvdata(pdev, NULL);
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kfree(gpio_vbus);
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return err;
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}
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static int __exit gpio_vbus_remove(struct platform_device *pdev)
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{
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struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
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struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
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int gpio = pdata->gpio_vbus;
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regulator_put(gpio_vbus->vbus_draw);
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otg_set_transceiver(NULL);
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free_irq(gpio_to_irq(gpio), &pdev->dev);
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if (gpio_is_valid(pdata->gpio_pullup))
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gpio_free(pdata->gpio_pullup);
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gpio_free(gpio);
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platform_set_drvdata(pdev, NULL);
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kfree(gpio_vbus);
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return 0;
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}
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/* NOTE: the gpio-vbus device may *NOT* be hotplugged */
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MODULE_ALIAS("platform:gpio-vbus");
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static struct platform_driver gpio_vbus_driver = {
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.driver = {
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.name = "gpio-vbus",
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.owner = THIS_MODULE,
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},
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.remove = __exit_p(gpio_vbus_remove),
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};
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static int __init gpio_vbus_init(void)
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{
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return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe);
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}
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module_init(gpio_vbus_init);
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static void __exit gpio_vbus_exit(void)
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{
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platform_driver_unregister(&gpio_vbus_driver);
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}
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module_exit(gpio_vbus_exit);
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MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
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MODULE_AUTHOR("Philipp Zabel");
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MODULE_LICENSE("GPL");
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