From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001 From: AndrĂ© Fabian Silva Delgado Date: Fri, 25 Mar 2016 03:53:42 -0300 Subject: Linux-libre 4.5-gnu --- drivers/parport/share.c | 246 +++++++++++++++++++++++++----------------------- 1 file changed, 126 insertions(+), 120 deletions(-) (limited to 'drivers/parport') diff --git a/drivers/parport/share.c b/drivers/parport/share.c index 5ce5ef211..3308427ed 100644 --- a/drivers/parport/share.c +++ b/drivers/parport/share.c @@ -1,6 +1,6 @@ /* * Parallel-port resource manager code. - * + * * Authors: David Campbell * Tim Waugh * Jose Renau @@ -54,16 +54,16 @@ static LIST_HEAD(drivers); static DEFINE_MUTEX(registration_lock); /* What you can do to a port that's gone away.. */ -static void dead_write_lines (struct parport *p, unsigned char b){} -static unsigned char dead_read_lines (struct parport *p) { return 0; } -static unsigned char dead_frob_lines (struct parport *p, unsigned char b, +static void dead_write_lines(struct parport *p, unsigned char b){} +static unsigned char dead_read_lines(struct parport *p) { return 0; } +static unsigned char dead_frob_lines(struct parport *p, unsigned char b, unsigned char c) { return 0; } -static void dead_onearg (struct parport *p){} -static void dead_initstate (struct pardevice *d, struct parport_state *s) { } -static void dead_state (struct parport *p, struct parport_state *s) { } -static size_t dead_write (struct parport *p, const void *b, size_t l, int f) +static void dead_onearg(struct parport *p){} +static void dead_initstate(struct pardevice *d, struct parport_state *s) { } +static void dead_state(struct parport *p, struct parport_state *s) { } +static size_t dead_write(struct parport *p, const void *b, size_t l, int f) { return 0; } -static size_t dead_read (struct parport *p, void *b, size_t l, int f) +static size_t dead_read(struct parport *p, void *b, size_t l, int f) { return 0; } static struct parport_operations dead_ops = { .write_data = dead_write_lines, /* data */ @@ -93,7 +93,7 @@ static struct parport_operations dead_ops = { .ecp_write_data = dead_write, /* ecp */ .ecp_read_data = dead_read, .ecp_write_addr = dead_write, - + .compat_write_data = dead_write, /* compat */ .nibble_read_data = dead_read, /* nibble */ .byte_read_data = dead_read, /* byte */ @@ -148,7 +148,7 @@ void parport_bus_exit(void) /* * iterates through all the drivers registered with the bus and sends the port * details to the match_port callback of the driver, so that the driver can - * know about the new port that just regsitered with the bus and decide if it + * know about the new port that just registered with the bus and decide if it * wants to use this new port. */ static int driver_check(struct device_driver *dev_drv, void *_port) @@ -194,7 +194,7 @@ static void detach_driver_chain(struct parport *port) struct parport_driver *drv; /* caller has exclusive registration_lock */ list_for_each_entry(drv, &drivers, list) - drv->detach (port); + drv->detach(port); /* * call the detach function of the drivers registered in @@ -205,11 +205,13 @@ static void detach_driver_chain(struct parport *port) } /* Ask kmod for some lowlevel drivers. */ -static void get_lowlevel_driver (void) +static void get_lowlevel_driver(void) { - /* There is no actual module called this: you should set - * up an alias for modutils. */ - request_module ("parport_lowlevel"); + /* + * There is no actual module called this: you should set + * up an alias for modutils. + */ + request_module("parport_lowlevel"); } /* @@ -265,7 +267,7 @@ int __parport_register_driver(struct parport_driver *drv, struct module *owner, const char *mod_name) { if (list_empty(&portlist)) - get_lowlevel_driver (); + get_lowlevel_driver(); if (drv->devmodel) { /* using device model */ @@ -328,7 +330,7 @@ static int port_detach(struct device *dev, void *_drv) * finished by the time this function returns. **/ -void parport_unregister_driver (struct parport_driver *drv) +void parport_unregister_driver(struct parport_driver *drv) { struct parport *port; @@ -343,6 +345,7 @@ void parport_unregister_driver (struct parport_driver *drv) } mutex_unlock(®istration_lock); } +EXPORT_SYMBOL(parport_unregister_driver); static void free_port(struct device *dev) { @@ -372,12 +375,13 @@ static void free_port(struct device *dev) * until the matching parport_put_port() call. **/ -struct parport *parport_get_port (struct parport *port) +struct parport *parport_get_port(struct parport *port) { struct device *dev = get_device(&port->bus_dev); return to_parport_dev(dev); } +EXPORT_SYMBOL(parport_get_port); void parport_del_port(struct parport *port) { @@ -394,10 +398,11 @@ EXPORT_SYMBOL(parport_del_port); * zero (port is no longer used), free_port is called. **/ -void parport_put_port (struct parport *port) +void parport_put_port(struct parport *port) { put_device(&port->bus_dev); } +EXPORT_SYMBOL(parport_put_port); /** * parport_register_port - register a parallel port @@ -439,10 +444,8 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma, int ret; tmp = kzalloc(sizeof(struct parport), GFP_KERNEL); - if (!tmp) { - printk(KERN_WARNING "parport: memory squeeze\n"); + if (!tmp) return NULL; - } /* Init our structure */ tmp->base = base; @@ -450,12 +453,12 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma, tmp->dma = dma; tmp->muxport = tmp->daisy = tmp->muxsel = -1; tmp->modes = 0; - INIT_LIST_HEAD(&tmp->list); + INIT_LIST_HEAD(&tmp->list); tmp->devices = tmp->cad = NULL; tmp->flags = 0; tmp->ops = ops; tmp->physport = tmp; - memset (tmp->probe_info, 0, 5 * sizeof (struct parport_device_info)); + memset(tmp->probe_info, 0, 5 * sizeof(struct parport_device_info)); rwlock_init(&tmp->cad_lock); spin_lock_init(&tmp->waitlist_lock); spin_lock_init(&tmp->pardevice_lock); @@ -463,12 +466,11 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma, tmp->ieee1284.phase = IEEE1284_PH_FWD_IDLE; sema_init(&tmp->ieee1284.irq, 0); tmp->spintime = parport_default_spintime; - atomic_set (&tmp->ref_count, 1); + atomic_set(&tmp->ref_count, 1); INIT_LIST_HEAD(&tmp->full_list); name = kmalloc(15, GFP_KERNEL); if (!name) { - printk(KERN_ERR "parport: memory squeeze\n"); kfree(tmp); return NULL; } @@ -508,6 +510,7 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma, return tmp; } +EXPORT_SYMBOL(parport_register_port); /** * parport_announce_port - tell device drivers about a parallel port @@ -521,7 +524,7 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma, * functions will be called, with @port as the parameter. **/ -void parport_announce_port (struct parport *port) +void parport_announce_port(struct parport *port) { int i; @@ -531,9 +534,8 @@ void parport_announce_port (struct parport *port) #endif if (!port->dev) - printk(KERN_WARNING "%s: fix this legacy " - "no-device port driver!\n", - port->name); + printk(KERN_WARNING "%s: fix this legacy no-device port driver!\n", + port->name); parport_proc_register(port); mutex_lock(®istration_lock); @@ -547,7 +549,7 @@ void parport_announce_port (struct parport *port) spin_unlock_irq(&parportlist_lock); /* Let drivers know that new port(s) has arrived. */ - attach_driver_chain (port); + attach_driver_chain(port); for (i = 1; i < 3; i++) { struct parport *slave = port->slaves[i-1]; if (slave) @@ -555,6 +557,7 @@ void parport_announce_port (struct parport *port) } mutex_unlock(®istration_lock); } +EXPORT_SYMBOL(parport_announce_port); /** * parport_remove_port - deregister a parallel port @@ -582,7 +585,7 @@ void parport_remove_port(struct parport *port) mutex_lock(®istration_lock); /* Spread the word. */ - detach_driver_chain (port); + detach_driver_chain(port); #ifdef CONFIG_PARPORT_1284 /* Forget the IEEE1284.3 topology of the port. */ @@ -616,6 +619,7 @@ void parport_remove_port(struct parport *port) parport_put_port(slave); } } +EXPORT_SYMBOL(parport_remove_port); /** * parport_register_device - register a device on a parallel port @@ -689,14 +693,14 @@ void parport_remove_port(struct parport *port) struct pardevice * parport_register_device(struct parport *port, const char *name, int (*pf)(void *), void (*kf)(void *), - void (*irq_func)(void *), + void (*irq_func)(void *), int flags, void *handle) { struct pardevice *tmp; if (port->physport->flags & PARPORT_FLAG_EXCL) { /* An exclusive device is registered. */ - printk (KERN_DEBUG "%s: no more devices allowed\n", + printk(KERN_DEBUG "%s: no more devices allowed\n", port->name); return NULL; } @@ -722,28 +726,24 @@ parport_register_device(struct parport *port, const char *name, } } - /* We up our own module reference count, and that of the port - on which a device is to be registered, to ensure that - neither of us gets unloaded while we sleep in (e.g.) - kmalloc. - */ - if (!try_module_get(port->ops->owner)) { + /* + * We up our own module reference count, and that of the port + * on which a device is to be registered, to ensure that + * neither of us gets unloaded while we sleep in (e.g.) + * kmalloc. + */ + if (!try_module_get(port->ops->owner)) return NULL; - } - - parport_get_port (port); + + parport_get_port(port); tmp = kmalloc(sizeof(struct pardevice), GFP_KERNEL); - if (tmp == NULL) { - printk(KERN_WARNING "%s: memory squeeze, couldn't register %s.\n", port->name, name); + if (!tmp) goto out; - } tmp->state = kmalloc(sizeof(struct parport_state), GFP_KERNEL); - if (tmp->state == NULL) { - printk(KERN_WARNING "%s: memory squeeze, couldn't register %s.\n", port->name, name); + if (!tmp->state) goto out_free_pardevice; - } tmp->name = name; tmp->port = port; @@ -767,19 +767,21 @@ parport_register_device(struct parport *port, const char *name, if (flags & PARPORT_DEV_EXCL) { if (port->physport->devices) { - spin_unlock (&port->physport->pardevice_lock); - printk (KERN_DEBUG - "%s: cannot grant exclusive access for " - "device %s\n", port->name, name); + spin_unlock(&port->physport->pardevice_lock); + printk(KERN_DEBUG + "%s: cannot grant exclusive access for device %s\n", + port->name, name); goto out_free_all; } port->flags |= PARPORT_FLAG_EXCL; } tmp->next = port->physport->devices; - wmb(); /* Make sure that tmp->next is written before it's - added to the list; see comments marked 'no locking - required' */ + wmb(); /* + * Make sure that tmp->next is written before it's + * added to the list; see comments marked 'no locking + * required' + */ if (port->physport->devices) port->physport->devices->prev = tmp; port->physport->devices = tmp; @@ -805,11 +807,12 @@ parport_register_device(struct parport *port, const char *name, out_free_pardevice: kfree(tmp); out: - parport_put_port (port); + parport_put_port(port); module_put(port->ops->owner); return NULL; } +EXPORT_SYMBOL(parport_register_device); static void free_pardevice(struct device *dev) { @@ -968,7 +971,7 @@ void parport_unregister_device(struct pardevice *dev) struct parport *port; #ifdef PARPORT_PARANOID - if (dev == NULL) { + if (!dev) { printk(KERN_ERR "parport_unregister_device: passed NULL\n"); return; } @@ -985,7 +988,7 @@ void parport_unregister_device(struct pardevice *dev) if (port->cad == dev) { printk(KERN_DEBUG "%s: %s forgot to release port\n", port->name, dev->name); - parport_release (dev); + parport_release(dev); } spin_lock(&port->pardevice_lock); @@ -1001,8 +1004,10 @@ void parport_unregister_device(struct pardevice *dev) spin_unlock(&port->pardevice_lock); - /* Make sure we haven't left any pointers around in the wait - * list. */ + /* + * Make sure we haven't left any pointers around in the wait + * list. + */ spin_lock_irq(&port->waitlist_lock); if (dev->waitprev || dev->waitnext || port->waithead == dev) { if (dev->waitprev) @@ -1023,8 +1028,9 @@ void parport_unregister_device(struct pardevice *dev) kfree(dev); module_put(port->ops->owner); - parport_put_port (port); + parport_put_port(port); } +EXPORT_SYMBOL(parport_unregister_device); /** * parport_find_number - find a parallel port by number @@ -1038,23 +1044,24 @@ void parport_unregister_device(struct pardevice *dev) * gives you, use parport_put_port(). */ -struct parport *parport_find_number (int number) +struct parport *parport_find_number(int number) { struct parport *port, *result = NULL; if (list_empty(&portlist)) - get_lowlevel_driver (); + get_lowlevel_driver(); - spin_lock (&parportlist_lock); + spin_lock(&parportlist_lock); list_for_each_entry(port, &portlist, list) { if (port->number == number) { - result = parport_get_port (port); + result = parport_get_port(port); break; } } - spin_unlock (&parportlist_lock); + spin_unlock(&parportlist_lock); return result; } +EXPORT_SYMBOL(parport_find_number); /** * parport_find_base - find a parallel port by base address @@ -1068,23 +1075,24 @@ struct parport *parport_find_number (int number) * gives you, use parport_put_port(). */ -struct parport *parport_find_base (unsigned long base) +struct parport *parport_find_base(unsigned long base) { struct parport *port, *result = NULL; if (list_empty(&portlist)) - get_lowlevel_driver (); + get_lowlevel_driver(); - spin_lock (&parportlist_lock); + spin_lock(&parportlist_lock); list_for_each_entry(port, &portlist, list) { if (port->base == base) { - result = parport_get_port (port); + result = parport_get_port(port); break; } } - spin_unlock (&parportlist_lock); + spin_unlock(&parportlist_lock); return result; } +EXPORT_SYMBOL(parport_find_base); /** * parport_claim - claim access to a parallel port device @@ -1111,8 +1119,9 @@ int parport_claim(struct pardevice *dev) } /* Preempt any current device */ - write_lock_irqsave (&port->cad_lock, flags); - if ((oldcad = port->cad) != NULL) { + write_lock_irqsave(&port->cad_lock, flags); + oldcad = port->cad; + if (oldcad) { if (oldcad->preempt) { if (oldcad->preempt(oldcad->private)) goto blocked; @@ -1121,8 +1130,10 @@ int parport_claim(struct pardevice *dev) goto blocked; if (port->cad != oldcad) { - /* I think we'll actually deadlock rather than - get here, but just in case.. */ + /* + * I think we'll actually deadlock rather than + * get here, but just in case.. + */ printk(KERN_WARNING "%s: %s released port when preempted!\n", port->name, oldcad->name); @@ -1136,7 +1147,7 @@ int parport_claim(struct pardevice *dev) dev->waiting = 0; /* Take ourselves out of the wait list again. */ - spin_lock_irq (&port->waitlist_lock); + spin_lock_irq(&port->waitlist_lock); if (dev->waitprev) dev->waitprev->waitnext = dev->waitnext; else @@ -1145,7 +1156,7 @@ int parport_claim(struct pardevice *dev) dev->waitnext->waitprev = dev->waitprev; else port->waittail = dev->waitprev; - spin_unlock_irq (&port->waitlist_lock); + spin_unlock_irq(&port->waitlist_lock); dev->waitprev = dev->waitnext = NULL; } @@ -1162,7 +1173,7 @@ int parport_claim(struct pardevice *dev) /* If it's a daisy chain device, select it. */ if (dev->daisy >= 0) { /* This could be lazier. */ - if (!parport_daisy_select (port, dev->daisy, + if (!parport_daisy_select(port, dev->daisy, IEEE1284_MODE_COMPAT)) port->daisy = dev->daisy; } @@ -1175,13 +1186,15 @@ int parport_claim(struct pardevice *dev) return 0; blocked: - /* If this is the first time we tried to claim the port, register an - interest. This is only allowed for devices sleeping in - parport_claim_or_block(), or those with a wakeup function. */ + /* + * If this is the first time we tried to claim the port, register an + * interest. This is only allowed for devices sleeping in + * parport_claim_or_block(), or those with a wakeup function. + */ /* The cad_lock is still held for writing here */ if (dev->waiting & 2 || dev->wakeup) { - spin_lock (&port->waitlist_lock); + spin_lock(&port->waitlist_lock); if (test_and_set_bit(0, &dev->waiting) == 0) { /* First add ourselves to the end of the wait list. */ dev->waitnext = NULL; @@ -1192,11 +1205,12 @@ blocked: } else port->waithead = port->waittail = dev; } - spin_unlock (&port->waitlist_lock); + spin_unlock(&port->waitlist_lock); } - write_unlock_irqrestore (&port->cad_lock, flags); + write_unlock_irqrestore(&port->cad_lock, flags); return -EAGAIN; } +EXPORT_SYMBOL(parport_claim); /** * parport_claim_or_block - claim access to a parallel port device @@ -1212,8 +1226,10 @@ int parport_claim_or_block(struct pardevice *dev) { int r; - /* Signal to parport_claim() that we can wait even without a - wakeup function. */ + /* + * Signal to parport_claim() that we can wait even without a + * wakeup function. + */ dev->waiting = 2; /* Try to claim the port. If this fails, we need to sleep. */ @@ -1231,14 +1247,15 @@ int parport_claim_or_block(struct pardevice *dev) * See also parport_release() */ - /* If dev->waiting is clear now, an interrupt - gave us the port and we would deadlock if we slept. */ + /* + * If dev->waiting is clear now, an interrupt + * gave us the port and we would deadlock if we slept. + */ if (dev->waiting) { wait_event_interruptible(dev->wait_q, !dev->waiting); - if (signal_pending (current)) { + if (signal_pending(current)) return -EINTR; - } r = 1; } else { r = 0; @@ -1250,15 +1267,15 @@ int parport_claim_or_block(struct pardevice *dev) #ifdef PARPORT_DEBUG_SHARING if (dev->port->physport->cad != dev) - printk(KERN_DEBUG "%s: exiting parport_claim_or_block " - "but %s owns port!\n", dev->name, - dev->port->physport->cad ? + printk(KERN_DEBUG "%s: exiting parport_claim_or_block but %s owns port!\n", + dev->name, dev->port->physport->cad ? dev->port->physport->cad->name:"nobody"); #endif } dev->waiting = 0; return r; } +EXPORT_SYMBOL(parport_claim_or_block); /** * parport_release - give up access to a parallel port device @@ -1278,9 +1295,9 @@ void parport_release(struct pardevice *dev) /* Make sure that dev is the current device */ write_lock_irqsave(&port->cad_lock, flags); if (port->cad != dev) { - write_unlock_irqrestore (&port->cad_lock, flags); - printk(KERN_WARNING "%s: %s tried to release parport " - "when not owner\n", port->name, dev->name); + write_unlock_irqrestore(&port->cad_lock, flags); + printk(KERN_WARNING "%s: %s tried to release parport when not owner\n", + port->name, dev->name); return; } @@ -1293,7 +1310,7 @@ void parport_release(struct pardevice *dev) /* If this is a daisy device, deselect it. */ if (dev->daisy >= 0) { - parport_daisy_deselect_all (port); + parport_daisy_deselect_all(port); port->daisy = -1; } #endif @@ -1304,8 +1321,10 @@ void parport_release(struct pardevice *dev) /* Save control registers */ port->ops->save_state(port, dev->state); - /* If anybody is waiting, find out who's been there longest and - then wake them up. (Note: no locking required) */ + /* + * If anybody is waiting, find out who's been there longest and + * then wake them up. (Note: no locking required) + */ /* !!! LOCKING IS NEEDED HERE */ for (pd = port->waithead; pd; pd = pd->waitnext) { if (pd->waiting & 2) { /* sleeping in claim_or_block */ @@ -1322,14 +1341,17 @@ void parport_release(struct pardevice *dev) } } - /* Nobody was waiting, so walk the list to see if anyone is - interested in being woken up. (Note: no locking required) */ + /* + * Nobody was waiting, so walk the list to see if anyone is + * interested in being woken up. (Note: no locking required) + */ /* !!! LOCKING IS NEEDED HERE */ - for (pd = port->devices; (port->cad == NULL) && pd; pd = pd->next) { + for (pd = port->devices; !port->cad && pd; pd = pd->next) { if (pd->wakeup && pd != dev) pd->wakeup(pd->private); } } +EXPORT_SYMBOL(parport_release); irqreturn_t parport_irq_handler(int irq, void *dev_id) { @@ -1339,22 +1361,6 @@ irqreturn_t parport_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } - -/* Exported symbols for modules. */ - -EXPORT_SYMBOL(parport_claim); -EXPORT_SYMBOL(parport_claim_or_block); -EXPORT_SYMBOL(parport_release); -EXPORT_SYMBOL(parport_register_port); -EXPORT_SYMBOL(parport_announce_port); -EXPORT_SYMBOL(parport_remove_port); -EXPORT_SYMBOL(parport_unregister_driver); -EXPORT_SYMBOL(parport_register_device); -EXPORT_SYMBOL(parport_unregister_device); -EXPORT_SYMBOL(parport_get_port); -EXPORT_SYMBOL(parport_put_port); -EXPORT_SYMBOL(parport_find_number); -EXPORT_SYMBOL(parport_find_base); EXPORT_SYMBOL(parport_irq_handler); MODULE_LICENSE("GPL"); -- cgit v1.2.3-54-g00ecf