parport: add device-model to parport subsystem
parport subsystem starts using the device-model. Drivers using the device-model has to define devmodel as true and should register the device with parport using parport_register_dev_model(). Tested-by: Jean Delvare <jdelvare@suse.de> Tested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee
Greg Kroah-Hartman
parent
208250dd4c
commit
6fa45a2268
4 changed files with 379 additions and 28 deletions
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@ -2255,7 +2255,7 @@ struct parport *parport_pc_probe_port(unsigned long int base,
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release_region(base+0x3, 5);
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release_region(base, 3);
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out4:
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parport_put_port(p);
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parport_del_port(p);
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out3:
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kfree(priv);
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out2:
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@ -2294,7 +2294,7 @@ void parport_pc_unregister_port(struct parport *p)
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priv->dma_handle);
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#endif
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kfree(p->private_data);
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parport_put_port(p);
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parport_del_port(p);
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kfree(ops); /* hope no-one cached it */
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}
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EXPORT_SYMBOL(parport_pc_unregister_port);
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@ -21,6 +21,7 @@
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#include <linux/parport.h>
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#include <linux/ctype.h>
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#include <linux/sysctl.h>
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#include <linux/device.h>
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#include <asm/uaccess.h>
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@ -558,8 +559,18 @@ int parport_device_proc_unregister(struct pardevice *device)
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static int __init parport_default_proc_register(void)
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{
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int ret;
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parport_default_sysctl_table.sysctl_header =
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register_sysctl_table(parport_default_sysctl_table.dev_dir);
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if (!parport_default_sysctl_table.sysctl_header)
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return -ENOMEM;
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ret = parport_bus_init();
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if (ret) {
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unregister_sysctl_table(parport_default_sysctl_table.
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sysctl_header);
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return ret;
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}
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return 0;
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}
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@ -570,6 +581,7 @@ static void __exit parport_default_proc_unregister(void)
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sysctl_header);
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parport_default_sysctl_table.sysctl_header = NULL;
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}
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parport_bus_exit();
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}
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#else /* no sysctl or no procfs*/
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@ -596,11 +608,12 @@ int parport_device_proc_unregister(struct pardevice *device)
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static int __init parport_default_proc_register (void)
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{
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return 0;
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return parport_bus_init();
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}
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static void __exit parport_default_proc_unregister (void)
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{
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parport_bus_exit();
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}
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#endif
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@ -29,6 +29,7 @@
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/kmod.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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@ -100,13 +101,91 @@ static struct parport_operations dead_ops = {
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.owner = NULL,
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};
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static struct device_type parport_device_type = {
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.name = "parport",
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};
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static int is_parport(struct device *dev)
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{
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return dev->type == &parport_device_type;
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}
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static int parport_probe(struct device *dev)
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{
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struct parport_driver *drv;
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if (is_parport(dev))
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return -ENODEV;
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drv = to_parport_driver(dev->driver);
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if (!drv->probe) {
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/* if driver has not defined a custom probe */
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struct pardevice *par_dev = to_pardevice(dev);
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if (strcmp(par_dev->name, drv->name))
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return -ENODEV;
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return 0;
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}
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/* if driver defined its own probe */
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return drv->probe(to_pardevice(dev));
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}
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static struct bus_type parport_bus_type = {
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.name = "parport",
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.probe = parport_probe,
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};
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int parport_bus_init(void)
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{
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return bus_register(&parport_bus_type);
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}
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void parport_bus_exit(void)
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{
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bus_unregister(&parport_bus_type);
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}
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/*
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* iterates through all the drivers registered with the bus and sends the port
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* details to the match_port callback of the driver, so that the driver can
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* know about the new port that just regsitered with the bus and decide if it
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* wants to use this new port.
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*/
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static int driver_check(struct device_driver *dev_drv, void *_port)
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{
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struct parport *port = _port;
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struct parport_driver *drv = to_parport_driver(dev_drv);
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if (drv->match_port)
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drv->match_port(port);
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return 0;
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}
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/* Call attach(port) for each registered driver. */
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static void attach_driver_chain(struct parport *port)
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{
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/* caller has exclusive registration_lock */
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struct parport_driver *drv;
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list_for_each_entry(drv, &drivers, list)
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drv->attach(port);
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/*
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* call the driver_check function of the drivers registered in
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* new device model
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*/
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bus_for_each_drv(&parport_bus_type, NULL, port, driver_check);
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}
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static int driver_detach(struct device_driver *_drv, void *_port)
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{
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struct parport *port = _port;
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struct parport_driver *drv = to_parport_driver(_drv);
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if (drv->detach)
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drv->detach(port);
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return 0;
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}
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/* Call detach(port) for each registered driver. */
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@ -116,6 +195,13 @@ static void detach_driver_chain(struct parport *port)
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/* caller has exclusive registration_lock */
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list_for_each_entry(drv, &drivers, list)
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drv->detach (port);
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/*
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* call the detach function of the drivers registered in
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* new device model
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*/
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bus_for_each_drv(&parport_bus_type, NULL, port, driver_detach);
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}
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/* Ask kmod for some lowlevel drivers. */
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@ -126,17 +212,39 @@ static void get_lowlevel_driver (void)
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request_module ("parport_lowlevel");
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}
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/*
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* iterates through all the devices connected to the bus and sends the device
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* details to the match_port callback of the driver, so that the driver can
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* know what are all the ports that are connected to the bus and choose the
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* port to which it wants to register its device.
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*/
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static int port_check(struct device *dev, void *dev_drv)
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{
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struct parport_driver *drv = dev_drv;
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/* only send ports, do not send other devices connected to bus */
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if (is_parport(dev))
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drv->match_port(to_parport_dev(dev));
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return 0;
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}
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/**
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* parport_register_driver - register a parallel port device driver
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* @drv: structure describing the driver
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* @owner: owner module of drv
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* @mod_name: module name string
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*
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* This can be called by a parallel port device driver in order
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* to receive notifications about ports being found in the
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* system, as well as ports no longer available.
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*
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* If devmodel is true then the new device model is used
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* for registration.
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*
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* The @drv structure is allocated by the caller and must not be
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* deallocated until after calling parport_unregister_driver().
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*
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* If using the non device model:
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* The driver's attach() function may block. The port that
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* attach() is given will be valid for the duration of the
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* callback, but if the driver wants to take a copy of the
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@ -148,21 +256,57 @@ static void get_lowlevel_driver (void)
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* callback, but if the driver wants to take a copy of the
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* pointer it must call parport_get_port() to do so.
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*
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* Returns 0 on success. Currently it always succeeds.
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*
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* Returns 0 on success. The non device model will always succeeds.
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* but the new device model can fail and will return the error code.
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**/
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int parport_register_driver (struct parport_driver *drv)
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int __parport_register_driver(struct parport_driver *drv, struct module *owner,
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const char *mod_name)
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{
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struct parport *port;
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if (list_empty(&portlist))
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get_lowlevel_driver ();
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mutex_lock(®istration_lock);
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list_for_each_entry(port, &portlist, list)
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drv->attach(port);
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list_add(&drv->list, &drivers);
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mutex_unlock(®istration_lock);
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if (drv->devmodel) {
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/* using device model */
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int ret;
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/* initialize common driver fields */
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drv->driver.name = drv->name;
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drv->driver.bus = &parport_bus_type;
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drv->driver.owner = owner;
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drv->driver.mod_name = mod_name;
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ret = driver_register(&drv->driver);
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if (ret)
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return ret;
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mutex_lock(®istration_lock);
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if (drv->match_port)
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bus_for_each_dev(&parport_bus_type, NULL, drv,
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port_check);
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mutex_unlock(®istration_lock);
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} else {
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struct parport *port;
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drv->devmodel = false;
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mutex_lock(®istration_lock);
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list_for_each_entry(port, &portlist, list)
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drv->attach(port);
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list_add(&drv->list, &drivers);
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mutex_unlock(®istration_lock);
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}
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return 0;
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}
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EXPORT_SYMBOL(__parport_register_driver);
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static int port_detach(struct device *dev, void *_drv)
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{
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struct parport_driver *drv = _drv;
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if (is_parport(dev) && drv->detach)
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drv->detach(to_parport_dev(dev));
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return 0;
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}
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@ -189,15 +333,22 @@ void parport_unregister_driver (struct parport_driver *drv)
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struct parport *port;
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mutex_lock(®istration_lock);
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list_del_init(&drv->list);
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list_for_each_entry(port, &portlist, list)
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drv->detach(port);
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if (drv->devmodel) {
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bus_for_each_dev(&parport_bus_type, NULL, drv, port_detach);
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driver_unregister(&drv->driver);
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} else {
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list_del_init(&drv->list);
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list_for_each_entry(port, &portlist, list)
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drv->detach(port);
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}
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mutex_unlock(®istration_lock);
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}
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static void free_port (struct parport *port)
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static void free_port(struct device *dev)
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{
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int d;
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struct parport *port = to_parport_dev(dev);
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spin_lock(&full_list_lock);
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list_del(&port->full_list);
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spin_unlock(&full_list_lock);
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@ -223,25 +374,29 @@ static void free_port (struct parport *port)
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struct parport *parport_get_port (struct parport *port)
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{
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atomic_inc (&port->ref_count);
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return port;
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struct device *dev = get_device(&port->bus_dev);
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return to_parport_dev(dev);
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}
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void parport_del_port(struct parport *port)
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{
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device_unregister(&port->bus_dev);
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}
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EXPORT_SYMBOL(parport_del_port);
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/**
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* parport_put_port - decrement a port's reference count
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* @port: the port
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*
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* This should be called once for each call to parport_get_port(),
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* once the port is no longer needed.
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* once the port is no longer needed. When the reference count reaches
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* zero (port is no longer used), free_port is called.
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**/
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void parport_put_port (struct parport *port)
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{
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if (atomic_dec_and_test (&port->ref_count))
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/* Can destroy it now. */
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free_port (port);
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return;
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put_device(&port->bus_dev);
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}
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/**
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@ -281,6 +436,7 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
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int num;
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int device;
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char *name;
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int ret;
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tmp = kzalloc(sizeof(struct parport), GFP_KERNEL);
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if (!tmp) {
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@ -333,6 +489,10 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
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*/
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sprintf(name, "parport%d", tmp->portnum = tmp->number);
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tmp->name = name;
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tmp->bus_dev.bus = &parport_bus_type;
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tmp->bus_dev.release = free_port;
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dev_set_name(&tmp->bus_dev, name);
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tmp->bus_dev.type = &parport_device_type;
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for (device = 0; device < 5; device++)
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/* assume the worst */
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@ -340,6 +500,12 @@ struct parport *parport_register_port(unsigned long base, int irq, int dma,
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tmp->waithead = tmp->waittail = NULL;
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ret = device_register(&tmp->bus_dev);
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if (ret) {
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put_device(&tmp->bus_dev);
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return NULL;
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}
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return tmp;
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}
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@ -575,6 +741,7 @@ parport_register_device(struct parport *port, const char *name,
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tmp->irq_func = irq_func;
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tmp->waiting = 0;
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tmp->timeout = 5 * HZ;
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tmp->devmodel = false;
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/* Chain this onto the list */
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tmp->prev = NULL;
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@ -630,6 +797,136 @@ parport_register_device(struct parport *port, const char *name,
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return NULL;
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}
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static void free_pardevice(struct device *dev)
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{
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struct pardevice *par_dev = to_pardevice(dev);
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kfree(par_dev->name);
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kfree(par_dev);
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}
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struct pardevice *
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parport_register_dev_model(struct parport *port, const char *name,
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const struct pardev_cb *par_dev_cb, int id)
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{
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struct pardevice *par_dev;
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int ret;
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char *devname;
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if (port->physport->flags & PARPORT_FLAG_EXCL) {
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/* An exclusive device is registered. */
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pr_err("%s: no more devices allowed\n", port->name);
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return NULL;
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}
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if (par_dev_cb->flags & PARPORT_DEV_LURK) {
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if (!par_dev_cb->preempt || !par_dev_cb->wakeup) {
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pr_info("%s: refused to register lurking device (%s) without callbacks\n",
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port->name, name);
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return NULL;
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}
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}
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if (!try_module_get(port->ops->owner))
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return NULL;
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parport_get_port(port);
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par_dev = kzalloc(sizeof(*par_dev), GFP_KERNEL);
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if (!par_dev)
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goto err_put_port;
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par_dev->state = kzalloc(sizeof(*par_dev->state), GFP_KERNEL);
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if (!par_dev->state)
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goto err_put_par_dev;
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devname = kstrdup(name, GFP_KERNEL);
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if (!devname)
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goto err_free_par_dev;
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par_dev->name = devname;
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par_dev->port = port;
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par_dev->daisy = -1;
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par_dev->preempt = par_dev_cb->preempt;
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par_dev->wakeup = par_dev_cb->wakeup;
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par_dev->private = par_dev_cb->private;
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par_dev->flags = par_dev_cb->flags;
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par_dev->irq_func = par_dev_cb->irq_func;
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par_dev->waiting = 0;
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par_dev->timeout = 5 * HZ;
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par_dev->dev.parent = &port->bus_dev;
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par_dev->dev.bus = &parport_bus_type;
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ret = dev_set_name(&par_dev->dev, "%s.%d", devname, id);
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if (ret)
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goto err_free_devname;
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par_dev->dev.release = free_pardevice;
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par_dev->devmodel = true;
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ret = device_register(&par_dev->dev);
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if (ret)
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goto err_put_dev;
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/* Chain this onto the list */
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par_dev->prev = NULL;
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/*
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* This function must not run from an irq handler so we don' t need
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* to clear irq on the local CPU. -arca
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*/
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spin_lock(&port->physport->pardevice_lock);
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if (par_dev_cb->flags & PARPORT_DEV_EXCL) {
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if (port->physport->devices) {
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spin_unlock(&port->physport->pardevice_lock);
|
||||
pr_debug("%s: cannot grant exclusive access for device %s\n",
|
||||
port->name, name);
|
||||
goto err_put_dev;
|
||||
}
|
||||
port->flags |= PARPORT_FLAG_EXCL;
|
||||
}
|
||||
|
||||
par_dev->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'
|
||||
*/
|
||||
if (port->physport->devices)
|
||||
port->physport->devices->prev = par_dev;
|
||||
port->physport->devices = par_dev;
|
||||
spin_unlock(&port->physport->pardevice_lock);
|
||||
|
||||
init_waitqueue_head(&par_dev->wait_q);
|
||||
par_dev->timeslice = parport_default_timeslice;
|
||||
par_dev->waitnext = NULL;
|
||||
par_dev->waitprev = NULL;
|
||||
|
||||
/*
|
||||
* This has to be run as last thing since init_state may need other
|
||||
* pardevice fields. -arca
|
||||
*/
|
||||
port->ops->init_state(par_dev, par_dev->state);
|
||||
port->proc_device = par_dev;
|
||||
parport_device_proc_register(par_dev);
|
||||
|
||||
return par_dev;
|
||||
|
||||
err_put_dev:
|
||||
put_device(&par_dev->dev);
|
||||
err_free_devname:
|
||||
kfree(devname);
|
||||
err_free_par_dev:
|
||||
kfree(par_dev->state);
|
||||
err_put_par_dev:
|
||||
if (!par_dev->devmodel)
|
||||
kfree(par_dev);
|
||||
err_put_port:
|
||||
parport_put_port(port);
|
||||
module_put(port->ops->owner);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(parport_register_dev_model);
|
||||
|
||||
/**
|
||||
* parport_unregister_device - deregister a device on a parallel port
|
||||
* @dev: pointer to structure representing device
|
||||
|
|
@ -691,7 +988,10 @@ void parport_unregister_device(struct pardevice *dev)
|
|||
spin_unlock_irq(&port->waitlist_lock);
|
||||
|
||||
kfree(dev->state);
|
||||
kfree(dev);
|
||||
if (dev->devmodel)
|
||||
device_unregister(&dev->dev);
|
||||
else
|
||||
kfree(dev);
|
||||
|
||||
module_put(port->ops->owner);
|
||||
parport_put_port (port);
|
||||
|
|
@ -1019,7 +1319,6 @@ EXPORT_SYMBOL(parport_release);
|
|||
EXPORT_SYMBOL(parport_register_port);
|
||||
EXPORT_SYMBOL(parport_announce_port);
|
||||
EXPORT_SYMBOL(parport_remove_port);
|
||||
EXPORT_SYMBOL(parport_register_driver);
|
||||
EXPORT_SYMBOL(parport_unregister_driver);
|
||||
EXPORT_SYMBOL(parport_register_device);
|
||||
EXPORT_SYMBOL(parport_unregister_device);
|
||||
|
|
|
|||
|
|
@ -13,6 +13,7 @@
|
|||
#include <linux/wait.h>
|
||||
#include <linux/irqreturn.h>
|
||||
#include <linux/semaphore.h>
|
||||
#include <linux/device.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include <uapi/linux/parport.h>
|
||||
|
||||
|
|
@ -145,6 +146,8 @@ struct pardevice {
|
|||
unsigned int flags;
|
||||
struct pardevice *next;
|
||||
struct pardevice *prev;
|
||||
struct device dev;
|
||||
bool devmodel;
|
||||
struct parport_state *state; /* saved status over preemption */
|
||||
wait_queue_head_t wait_q;
|
||||
unsigned long int time;
|
||||
|
|
@ -156,6 +159,8 @@ struct pardevice {
|
|||
void * sysctl_table;
|
||||
};
|
||||
|
||||
#define to_pardevice(n) container_of(n, struct pardevice, dev)
|
||||
|
||||
/* IEEE1284 information */
|
||||
|
||||
/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
|
||||
|
|
@ -195,7 +200,7 @@ struct parport {
|
|||
* This may unfortulately be null if the
|
||||
* port has a legacy driver.
|
||||
*/
|
||||
|
||||
struct device bus_dev; /* to link with the bus */
|
||||
struct parport *physport;
|
||||
/* If this is a non-default mux
|
||||
parport, i.e. we're a clone of a real
|
||||
|
|
@ -245,15 +250,26 @@ struct parport {
|
|||
struct parport *slaves[3];
|
||||
};
|
||||
|
||||
#define to_parport_dev(n) container_of(n, struct parport, bus_dev)
|
||||
|
||||
#define DEFAULT_SPIN_TIME 500 /* us */
|
||||
|
||||
struct parport_driver {
|
||||
const char *name;
|
||||
void (*attach) (struct parport *);
|
||||
void (*detach) (struct parport *);
|
||||
void (*match_port)(struct parport *);
|
||||
int (*probe)(struct pardevice *);
|
||||
struct device_driver driver;
|
||||
bool devmodel;
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
#define to_parport_driver(n) container_of(n, struct parport_driver, driver)
|
||||
|
||||
int parport_bus_init(void);
|
||||
void parport_bus_exit(void);
|
||||
|
||||
/* parport_register_port registers a new parallel port at the given
|
||||
address (if one does not already exist) and returns a pointer to it.
|
||||
This entails claiming the I/O region, IRQ and DMA. NULL is returned
|
||||
|
|
@ -272,10 +288,20 @@ void parport_announce_port (struct parport *port);
|
|||
extern void parport_remove_port(struct parport *port);
|
||||
|
||||
/* Register a new high-level driver. */
|
||||
extern int parport_register_driver (struct parport_driver *);
|
||||
|
||||
int __must_check __parport_register_driver(struct parport_driver *,
|
||||
struct module *,
|
||||
const char *mod_name);
|
||||
/*
|
||||
* parport_register_driver must be a macro so that KBUILD_MODNAME can
|
||||
* be expanded
|
||||
*/
|
||||
#define parport_register_driver(driver) \
|
||||
__parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
|
||||
|
||||
/* Unregister a high-level driver. */
|
||||
extern void parport_unregister_driver (struct parport_driver *);
|
||||
void parport_unregister_driver(struct parport_driver *);
|
||||
|
||||
/* If parport_register_driver doesn't fit your needs, perhaps
|
||||
* parport_find_xxx does. */
|
||||
|
|
@ -288,6 +314,15 @@ extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
|
|||
/* Reference counting for ports. */
|
||||
extern struct parport *parport_get_port (struct parport *);
|
||||
extern void parport_put_port (struct parport *);
|
||||
void parport_del_port(struct parport *);
|
||||
|
||||
struct pardev_cb {
|
||||
int (*preempt)(void *);
|
||||
void (*wakeup)(void *);
|
||||
void *private;
|
||||
void (*irq_func)(void *);
|
||||
unsigned int flags;
|
||||
};
|
||||
|
||||
/* parport_register_device declares that a device is connected to a
|
||||
port, and tells the kernel all it needs to know.
|
||||
|
|
@ -301,6 +336,10 @@ struct pardevice *parport_register_device(struct parport *port,
|
|||
void (*irq_func)(void *),
|
||||
int flags, void *handle);
|
||||
|
||||
struct pardevice *
|
||||
parport_register_dev_model(struct parport *port, const char *name,
|
||||
const struct pardev_cb *par_dev_cb, int cnt);
|
||||
|
||||
/* parport_unregister unlinks a device from the chain. */
|
||||
extern void parport_unregister_device(struct pardevice *dev);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue