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fc7a6209d5
The driver core ignores the return value of this callback because there is only little it can do when a device disappears. This is the final bit of a long lasting cleanup quest where several buses were converted to also return void from their remove callback. Additionally some resource leaks were fixed that were caused by drivers returning an error code in the expectation that the driver won't go away. With struct bus_type::remove returning void it's prevented that newly implemented buses return an ignored error code and so don't anticipate wrong expectations for driver authors. Reviewed-by: Tom Rix <trix@redhat.com> (For fpga) Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio) Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts) Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb) Acked-by: Pali Rohár <pali@kernel.org> Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media) Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform) Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-By: Vinod Koul <vkoul@kernel.org> Acked-by: Juergen Gross <jgross@suse.com> (For xen) Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd) Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb) Acked-by: Johan Hovold <johan@kernel.org> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus) Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio) Acked-by: Maximilian Luz <luzmaximilian@gmail.com> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec) Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack) Acked-by: Geoff Levand <geoff@infradead.org> (For ps3) Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt) Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th) Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia) Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI) Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr) Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid) Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM) Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa) Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire) Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid) Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox) Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss) Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC) Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C Acked-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Finn Thain <fthain@linux-m68k.org> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
855 lines
20 KiB
C
855 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic gameport layer
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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* Copyright (c) 2005 Dmitry Torokhov
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/gameport.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h> /* HZ */
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#include <linux/mutex.h>
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#include <linux/timekeeping.h>
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/*#include <asm/io.h>*/
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Generic gameport layer");
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MODULE_LICENSE("GPL");
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static bool use_ktime = true;
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module_param(use_ktime, bool, 0400);
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MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
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/*
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* gameport_mutex protects entire gameport subsystem and is taken
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* every time gameport port or driver registrered or unregistered.
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*/
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static DEFINE_MUTEX(gameport_mutex);
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static LIST_HEAD(gameport_list);
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static struct bus_type gameport_bus;
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static void gameport_add_port(struct gameport *gameport);
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static void gameport_attach_driver(struct gameport_driver *drv);
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static void gameport_reconnect_port(struct gameport *gameport);
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static void gameport_disconnect_port(struct gameport *gameport);
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#if defined(__i386__)
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#include <linux/i8253.h>
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#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0))
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#define GET_TIME(x) do { x = get_time_pit(); } while (0)
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static unsigned int get_time_pit(void)
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{
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unsigned long flags;
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unsigned int count;
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raw_spin_lock_irqsave(&i8253_lock, flags);
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outb_p(0x00, 0x43);
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count = inb_p(0x40);
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count |= inb_p(0x40) << 8;
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raw_spin_unlock_irqrestore(&i8253_lock, flags);
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return count;
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}
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#endif
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/*
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* gameport_measure_speed() measures the gameport i/o speed.
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*/
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static int gameport_measure_speed(struct gameport *gameport)
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{
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unsigned int i, t, tx;
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u64 t1, t2, t3;
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unsigned long flags;
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
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return 0;
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tx = ~0;
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for (i = 0; i < 50; i++) {
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local_irq_save(flags);
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t1 = ktime_get_ns();
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for (t = 0; t < 50; t++)
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gameport_read(gameport);
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t2 = ktime_get_ns();
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t3 = ktime_get_ns();
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local_irq_restore(flags);
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udelay(i * 10);
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t = (t2 - t1) - (t3 - t2);
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if (t < tx)
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tx = t;
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}
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gameport_close(gameport);
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t = 1000000 * 50;
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if (tx)
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t /= tx;
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return t;
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}
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static int old_gameport_measure_speed(struct gameport *gameport)
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{
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#if defined(__i386__)
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unsigned int i, t, t1, t2, t3, tx;
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unsigned long flags;
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
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return 0;
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tx = 1 << 30;
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for(i = 0; i < 50; i++) {
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local_irq_save(flags);
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GET_TIME(t1);
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for (t = 0; t < 50; t++) gameport_read(gameport);
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GET_TIME(t2);
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GET_TIME(t3);
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local_irq_restore(flags);
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udelay(i * 10);
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if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
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}
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gameport_close(gameport);
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return 59659 / (tx < 1 ? 1 : tx);
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#elif defined (__x86_64__)
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unsigned int i, t;
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unsigned long tx, t1, t2, flags;
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
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return 0;
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tx = 1 << 30;
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for(i = 0; i < 50; i++) {
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local_irq_save(flags);
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t1 = rdtsc();
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for (t = 0; t < 50; t++) gameport_read(gameport);
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t2 = rdtsc();
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local_irq_restore(flags);
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udelay(i * 10);
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if (t2 - t1 < tx) tx = t2 - t1;
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}
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gameport_close(gameport);
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return (this_cpu_read(cpu_info.loops_per_jiffy) *
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(unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx);
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#else
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unsigned int j, t = 0;
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
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return 0;
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j = jiffies; while (j == jiffies);
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j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); }
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gameport_close(gameport);
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return t * HZ / 1000;
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#endif
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}
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void gameport_start_polling(struct gameport *gameport)
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{
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spin_lock(&gameport->timer_lock);
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if (!gameport->poll_cnt++) {
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BUG_ON(!gameport->poll_handler);
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BUG_ON(!gameport->poll_interval);
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mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval));
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}
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spin_unlock(&gameport->timer_lock);
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}
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EXPORT_SYMBOL(gameport_start_polling);
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void gameport_stop_polling(struct gameport *gameport)
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{
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spin_lock(&gameport->timer_lock);
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if (!--gameport->poll_cnt)
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del_timer(&gameport->poll_timer);
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spin_unlock(&gameport->timer_lock);
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}
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EXPORT_SYMBOL(gameport_stop_polling);
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static void gameport_run_poll_handler(struct timer_list *t)
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{
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struct gameport *gameport = from_timer(gameport, t, poll_timer);
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gameport->poll_handler(gameport);
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if (gameport->poll_cnt)
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mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval));
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}
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/*
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* Basic gameport -> driver core mappings
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*/
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static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv)
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{
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int error;
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gameport->dev.driver = &drv->driver;
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if (drv->connect(gameport, drv)) {
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gameport->dev.driver = NULL;
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return -ENODEV;
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}
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error = device_bind_driver(&gameport->dev);
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if (error) {
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dev_warn(&gameport->dev,
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"device_bind_driver() failed for %s (%s) and %s, error: %d\n",
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gameport->phys, gameport->name,
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drv->description, error);
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drv->disconnect(gameport);
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gameport->dev.driver = NULL;
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return error;
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}
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return 0;
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}
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static void gameport_find_driver(struct gameport *gameport)
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{
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int error;
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error = device_attach(&gameport->dev);
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if (error < 0)
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dev_warn(&gameport->dev,
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"device_attach() failed for %s (%s), error: %d\n",
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gameport->phys, gameport->name, error);
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}
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/*
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* Gameport event processing.
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*/
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enum gameport_event_type {
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GAMEPORT_REGISTER_PORT,
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GAMEPORT_ATTACH_DRIVER,
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};
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struct gameport_event {
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enum gameport_event_type type;
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void *object;
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struct module *owner;
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struct list_head node;
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};
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static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */
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static LIST_HEAD(gameport_event_list);
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static struct gameport_event *gameport_get_event(void)
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{
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struct gameport_event *event = NULL;
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unsigned long flags;
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spin_lock_irqsave(&gameport_event_lock, flags);
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if (!list_empty(&gameport_event_list)) {
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event = list_first_entry(&gameport_event_list,
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struct gameport_event, node);
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list_del_init(&event->node);
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}
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spin_unlock_irqrestore(&gameport_event_lock, flags);
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return event;
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}
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static void gameport_free_event(struct gameport_event *event)
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{
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module_put(event->owner);
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kfree(event);
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}
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static void gameport_remove_duplicate_events(struct gameport_event *event)
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{
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struct gameport_event *e, *next;
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unsigned long flags;
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spin_lock_irqsave(&gameport_event_lock, flags);
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list_for_each_entry_safe(e, next, &gameport_event_list, node) {
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if (event->object == e->object) {
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/*
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* If this event is of different type we should not
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* look further - we only suppress duplicate events
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* that were sent back-to-back.
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*/
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if (event->type != e->type)
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break;
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list_del_init(&e->node);
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gameport_free_event(e);
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}
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}
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spin_unlock_irqrestore(&gameport_event_lock, flags);
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}
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static void gameport_handle_events(struct work_struct *work)
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{
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struct gameport_event *event;
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mutex_lock(&gameport_mutex);
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/*
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* Note that we handle only one event here to give swsusp
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* a chance to freeze kgameportd thread. Gameport events
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* should be pretty rare so we are not concerned about
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* taking performance hit.
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*/
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if ((event = gameport_get_event())) {
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switch (event->type) {
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case GAMEPORT_REGISTER_PORT:
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gameport_add_port(event->object);
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break;
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case GAMEPORT_ATTACH_DRIVER:
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gameport_attach_driver(event->object);
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break;
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}
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gameport_remove_duplicate_events(event);
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gameport_free_event(event);
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}
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mutex_unlock(&gameport_mutex);
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}
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static DECLARE_WORK(gameport_event_work, gameport_handle_events);
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static int gameport_queue_event(void *object, struct module *owner,
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enum gameport_event_type event_type)
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{
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unsigned long flags;
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struct gameport_event *event;
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int retval = 0;
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spin_lock_irqsave(&gameport_event_lock, flags);
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/*
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* Scan event list for the other events for the same gameport port,
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* starting with the most recent one. If event is the same we
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* do not need add new one. If event is of different type we
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* need to add this event and should not look further because
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* we need to preserve sequence of distinct events.
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*/
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list_for_each_entry_reverse(event, &gameport_event_list, node) {
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if (event->object == object) {
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if (event->type == event_type)
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goto out;
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break;
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}
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}
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event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC);
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if (!event) {
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pr_err("Not enough memory to queue event %d\n", event_type);
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retval = -ENOMEM;
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goto out;
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}
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if (!try_module_get(owner)) {
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pr_warn("Can't get module reference, dropping event %d\n",
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event_type);
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kfree(event);
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retval = -EINVAL;
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goto out;
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}
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event->type = event_type;
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event->object = object;
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event->owner = owner;
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list_add_tail(&event->node, &gameport_event_list);
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queue_work(system_long_wq, &gameport_event_work);
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out:
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spin_unlock_irqrestore(&gameport_event_lock, flags);
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return retval;
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}
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/*
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* Remove all events that have been submitted for a given object,
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* be it a gameport port or a driver.
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*/
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static void gameport_remove_pending_events(void *object)
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{
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struct gameport_event *event, *next;
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unsigned long flags;
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spin_lock_irqsave(&gameport_event_lock, flags);
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list_for_each_entry_safe(event, next, &gameport_event_list, node) {
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if (event->object == object) {
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list_del_init(&event->node);
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gameport_free_event(event);
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}
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}
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spin_unlock_irqrestore(&gameport_event_lock, flags);
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}
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/*
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* Destroy child gameport port (if any) that has not been fully registered yet.
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*
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* Note that we rely on the fact that port can have only one child and therefore
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* only one child registration request can be pending. Additionally, children
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* are registered by driver's connect() handler so there can't be a grandchild
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* pending registration together with a child.
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*/
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static struct gameport *gameport_get_pending_child(struct gameport *parent)
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{
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struct gameport_event *event;
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struct gameport *gameport, *child = NULL;
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unsigned long flags;
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spin_lock_irqsave(&gameport_event_lock, flags);
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list_for_each_entry(event, &gameport_event_list, node) {
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if (event->type == GAMEPORT_REGISTER_PORT) {
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gameport = event->object;
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if (gameport->parent == parent) {
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child = gameport;
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break;
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}
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}
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}
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spin_unlock_irqrestore(&gameport_event_lock, flags);
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return child;
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}
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/*
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* Gameport port operations
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*/
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static ssize_t gameport_description_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct gameport *gameport = to_gameport_port(dev);
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return sprintf(buf, "%s\n", gameport->name);
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}
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static DEVICE_ATTR(description, S_IRUGO, gameport_description_show, NULL);
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static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct gameport *gameport = to_gameport_port(dev);
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struct device_driver *drv;
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|
int error;
|
|
|
|
error = mutex_lock_interruptible(&gameport_mutex);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!strncmp(buf, "none", count)) {
|
|
gameport_disconnect_port(gameport);
|
|
} else if (!strncmp(buf, "reconnect", count)) {
|
|
gameport_reconnect_port(gameport);
|
|
} else if (!strncmp(buf, "rescan", count)) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_find_driver(gameport);
|
|
} else if ((drv = driver_find(buf, &gameport_bus)) != NULL) {
|
|
gameport_disconnect_port(gameport);
|
|
error = gameport_bind_driver(gameport, to_gameport_driver(drv));
|
|
} else {
|
|
error = -EINVAL;
|
|
}
|
|
|
|
mutex_unlock(&gameport_mutex);
|
|
|
|
return error ? error : count;
|
|
}
|
|
static DEVICE_ATTR_WO(drvctl);
|
|
|
|
static struct attribute *gameport_device_attrs[] = {
|
|
&dev_attr_description.attr,
|
|
&dev_attr_drvctl.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(gameport_device);
|
|
|
|
static void gameport_release_port(struct device *dev)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
|
|
kfree(gameport);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
void gameport_set_phys(struct gameport *gameport, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args);
|
|
va_end(args);
|
|
}
|
|
EXPORT_SYMBOL(gameport_set_phys);
|
|
|
|
/*
|
|
* Prepare gameport port for registration.
|
|
*/
|
|
static void gameport_init_port(struct gameport *gameport)
|
|
{
|
|
static atomic_t gameport_no = ATOMIC_INIT(-1);
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
mutex_init(&gameport->drv_mutex);
|
|
device_initialize(&gameport->dev);
|
|
dev_set_name(&gameport->dev, "gameport%lu",
|
|
(unsigned long)atomic_inc_return(&gameport_no));
|
|
gameport->dev.bus = &gameport_bus;
|
|
gameport->dev.release = gameport_release_port;
|
|
if (gameport->parent)
|
|
gameport->dev.parent = &gameport->parent->dev;
|
|
|
|
INIT_LIST_HEAD(&gameport->node);
|
|
spin_lock_init(&gameport->timer_lock);
|
|
timer_setup(&gameport->poll_timer, gameport_run_poll_handler, 0);
|
|
}
|
|
|
|
/*
|
|
* Complete gameport port registration.
|
|
* Driver core will attempt to find appropriate driver for the port.
|
|
*/
|
|
static void gameport_add_port(struct gameport *gameport)
|
|
{
|
|
int error;
|
|
|
|
if (gameport->parent)
|
|
gameport->parent->child = gameport;
|
|
|
|
gameport->speed = use_ktime ?
|
|
gameport_measure_speed(gameport) :
|
|
old_gameport_measure_speed(gameport);
|
|
|
|
list_add_tail(&gameport->node, &gameport_list);
|
|
|
|
if (gameport->io)
|
|
dev_info(&gameport->dev, "%s is %s, io %#x, speed %dkHz\n",
|
|
gameport->name, gameport->phys, gameport->io, gameport->speed);
|
|
else
|
|
dev_info(&gameport->dev, "%s is %s, speed %dkHz\n",
|
|
gameport->name, gameport->phys, gameport->speed);
|
|
|
|
error = device_add(&gameport->dev);
|
|
if (error)
|
|
dev_err(&gameport->dev,
|
|
"device_add() failed for %s (%s), error: %d\n",
|
|
gameport->phys, gameport->name, error);
|
|
}
|
|
|
|
/*
|
|
* gameport_destroy_port() completes deregistration process and removes
|
|
* port from the system
|
|
*/
|
|
static void gameport_destroy_port(struct gameport *gameport)
|
|
{
|
|
struct gameport *child;
|
|
|
|
child = gameport_get_pending_child(gameport);
|
|
if (child) {
|
|
gameport_remove_pending_events(child);
|
|
put_device(&child->dev);
|
|
}
|
|
|
|
if (gameport->parent) {
|
|
gameport->parent->child = NULL;
|
|
gameport->parent = NULL;
|
|
}
|
|
|
|
if (device_is_registered(&gameport->dev))
|
|
device_del(&gameport->dev);
|
|
|
|
list_del_init(&gameport->node);
|
|
|
|
gameport_remove_pending_events(gameport);
|
|
put_device(&gameport->dev);
|
|
}
|
|
|
|
/*
|
|
* Reconnect gameport port and all its children (re-initialize attached devices)
|
|
*/
|
|
static void gameport_reconnect_port(struct gameport *gameport)
|
|
{
|
|
do {
|
|
if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_find_driver(gameport);
|
|
/* Ok, old children are now gone, we are done */
|
|
break;
|
|
}
|
|
gameport = gameport->child;
|
|
} while (gameport);
|
|
}
|
|
|
|
/*
|
|
* gameport_disconnect_port() unbinds a port from its driver. As a side effect
|
|
* all child ports are unbound and destroyed.
|
|
*/
|
|
static void gameport_disconnect_port(struct gameport *gameport)
|
|
{
|
|
struct gameport *s, *parent;
|
|
|
|
if (gameport->child) {
|
|
/*
|
|
* Children ports should be disconnected and destroyed
|
|
* first, staring with the leaf one, since we don't want
|
|
* to do recursion
|
|
*/
|
|
for (s = gameport; s->child; s = s->child)
|
|
/* empty */;
|
|
|
|
do {
|
|
parent = s->parent;
|
|
|
|
device_release_driver(&s->dev);
|
|
gameport_destroy_port(s);
|
|
} while ((s = parent) != gameport);
|
|
}
|
|
|
|
/*
|
|
* Ok, no children left, now disconnect this port
|
|
*/
|
|
device_release_driver(&gameport->dev);
|
|
}
|
|
|
|
/*
|
|
* Submits register request to kgameportd for subsequent execution.
|
|
* Note that port registration is always asynchronous.
|
|
*/
|
|
void __gameport_register_port(struct gameport *gameport, struct module *owner)
|
|
{
|
|
gameport_init_port(gameport);
|
|
gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT);
|
|
}
|
|
EXPORT_SYMBOL(__gameport_register_port);
|
|
|
|
/*
|
|
* Synchronously unregisters gameport port.
|
|
*/
|
|
void gameport_unregister_port(struct gameport *gameport)
|
|
{
|
|
mutex_lock(&gameport_mutex);
|
|
gameport_disconnect_port(gameport);
|
|
gameport_destroy_port(gameport);
|
|
mutex_unlock(&gameport_mutex);
|
|
}
|
|
EXPORT_SYMBOL(gameport_unregister_port);
|
|
|
|
|
|
/*
|
|
* Gameport driver operations
|
|
*/
|
|
|
|
static ssize_t description_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct gameport_driver *driver = to_gameport_driver(drv);
|
|
return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
|
|
}
|
|
static DRIVER_ATTR_RO(description);
|
|
|
|
static struct attribute *gameport_driver_attrs[] = {
|
|
&driver_attr_description.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(gameport_driver);
|
|
|
|
static int gameport_driver_probe(struct device *dev)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
struct gameport_driver *drv = to_gameport_driver(dev->driver);
|
|
|
|
drv->connect(gameport, drv);
|
|
return gameport->drv ? 0 : -ENODEV;
|
|
}
|
|
|
|
static void gameport_driver_remove(struct device *dev)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
struct gameport_driver *drv = to_gameport_driver(dev->driver);
|
|
|
|
drv->disconnect(gameport);
|
|
}
|
|
|
|
static void gameport_attach_driver(struct gameport_driver *drv)
|
|
{
|
|
int error;
|
|
|
|
error = driver_attach(&drv->driver);
|
|
if (error)
|
|
pr_err("driver_attach() failed for %s, error: %d\n",
|
|
drv->driver.name, error);
|
|
}
|
|
|
|
int __gameport_register_driver(struct gameport_driver *drv, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
int error;
|
|
|
|
drv->driver.bus = &gameport_bus;
|
|
drv->driver.owner = owner;
|
|
drv->driver.mod_name = mod_name;
|
|
|
|
/*
|
|
* Temporarily disable automatic binding because probing
|
|
* takes long time and we are better off doing it in kgameportd
|
|
*/
|
|
drv->ignore = true;
|
|
|
|
error = driver_register(&drv->driver);
|
|
if (error) {
|
|
pr_err("driver_register() failed for %s, error: %d\n",
|
|
drv->driver.name, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Reset ignore flag and let kgameportd bind the driver to free ports
|
|
*/
|
|
drv->ignore = false;
|
|
error = gameport_queue_event(drv, NULL, GAMEPORT_ATTACH_DRIVER);
|
|
if (error) {
|
|
driver_unregister(&drv->driver);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__gameport_register_driver);
|
|
|
|
void gameport_unregister_driver(struct gameport_driver *drv)
|
|
{
|
|
struct gameport *gameport;
|
|
|
|
mutex_lock(&gameport_mutex);
|
|
|
|
drv->ignore = true; /* so gameport_find_driver ignores it */
|
|
gameport_remove_pending_events(drv);
|
|
|
|
start_over:
|
|
list_for_each_entry(gameport, &gameport_list, node) {
|
|
if (gameport->drv == drv) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_find_driver(gameport);
|
|
/* we could've deleted some ports, restart */
|
|
goto start_over;
|
|
}
|
|
}
|
|
|
|
driver_unregister(&drv->driver);
|
|
|
|
mutex_unlock(&gameport_mutex);
|
|
}
|
|
EXPORT_SYMBOL(gameport_unregister_driver);
|
|
|
|
static int gameport_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct gameport_driver *gameport_drv = to_gameport_driver(drv);
|
|
|
|
return !gameport_drv->ignore;
|
|
}
|
|
|
|
static struct bus_type gameport_bus = {
|
|
.name = "gameport",
|
|
.dev_groups = gameport_device_groups,
|
|
.drv_groups = gameport_driver_groups,
|
|
.match = gameport_bus_match,
|
|
.probe = gameport_driver_probe,
|
|
.remove = gameport_driver_remove,
|
|
};
|
|
|
|
static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv)
|
|
{
|
|
mutex_lock(&gameport->drv_mutex);
|
|
gameport->drv = drv;
|
|
mutex_unlock(&gameport->drv_mutex);
|
|
}
|
|
|
|
int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode)
|
|
{
|
|
if (gameport->open) {
|
|
if (gameport->open(gameport, mode)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (mode != GAMEPORT_MODE_RAW)
|
|
return -1;
|
|
}
|
|
|
|
gameport_set_drv(gameport, drv);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gameport_open);
|
|
|
|
void gameport_close(struct gameport *gameport)
|
|
{
|
|
del_timer_sync(&gameport->poll_timer);
|
|
gameport->poll_handler = NULL;
|
|
gameport->poll_interval = 0;
|
|
gameport_set_drv(gameport, NULL);
|
|
if (gameport->close)
|
|
gameport->close(gameport);
|
|
}
|
|
EXPORT_SYMBOL(gameport_close);
|
|
|
|
static int __init gameport_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = bus_register(&gameport_bus);
|
|
if (error) {
|
|
pr_err("failed to register gameport bus, error: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit gameport_exit(void)
|
|
{
|
|
bus_unregister(&gameport_bus);
|
|
|
|
/*
|
|
* There should not be any outstanding events but work may
|
|
* still be scheduled so simply cancel it.
|
|
*/
|
|
cancel_work_sync(&gameport_event_work);
|
|
}
|
|
|
|
subsys_initcall(gameport_init);
|
|
module_exit(gameport_exit);
|