diff options
Diffstat (limited to 'drivers/dio/dio-driver.c')
| -rw-r--r-- | drivers/dio/dio-driver.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c new file mode 100644 index 00000000000..ffe6f44ac76 --- /dev/null +++ b/drivers/dio/dio-driver.c @@ -0,0 +1,163 @@ +/* + * DIO Driver Services + * + * Copyright (C) 2004 Jochen Friedrich + * + * Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/dio.h> + + + /** + * dio_match_device - Tell if a DIO device structure has a matching + * DIO device id structure + * @ids: array of DIO device id structures to search in + * @dev: the DIO device structure to match against + * + * Used by a driver to check whether a DIO device present in the + * system is in its list of supported devices. Returns the matching + * dio_device_id structure or %NULL if there is no match. + */ + +const struct dio_device_id * +dio_match_device(const struct dio_device_id *ids, + const struct dio_dev *d) +{ + while (ids->id) { + if (ids->id == DIO_WILDCARD) + return ids; + if (DIO_NEEDSSECID(ids->id & 0xff)) { + if (ids->id == d->id) + return ids; + } else { + if ((ids->id & 0xff) == (d->id & 0xff)) + return ids; + } + ids++; + } + return NULL; +} + +static int dio_device_probe(struct device *dev) +{ + int error = 0; + struct dio_driver *drv = to_dio_driver(dev->driver); + struct dio_dev *d = to_dio_dev(dev); + + if (!d->driver && drv->probe) { + const struct dio_device_id *id; + + id = dio_match_device(drv->id_table, d); + if (id) + error = drv->probe(d, id); + if (error >= 0) { + d->driver = drv; + error = 0; + } + } + return error; +} + + + /** + * dio_register_driver - register a new DIO driver + * @drv: the driver structure to register + * + * Adds the driver structure to the list of registered drivers + * Returns the number of DIO devices which were claimed by the driver + * during registration. The driver remains registered even if the + * return value is zero. + */ + +int dio_register_driver(struct dio_driver *drv) +{ + int count = 0; + + /* initialize common driver fields */ + drv->driver.name = drv->name; + drv->driver.bus = &dio_bus_type; + drv->driver.probe = dio_device_probe; + + /* register with core */ + count = driver_register(&drv->driver); + return count ? count : 1; +} + + + /** + * dio_unregister_driver - unregister a DIO driver + * @drv: the driver structure to unregister + * + * Deletes the driver structure from the list of registered DIO drivers, + * gives it a chance to clean up by calling its remove() function for + * each device it was responsible for, and marks those devices as + * driverless. + */ + +void dio_unregister_driver(struct dio_driver *drv) +{ + driver_unregister(&drv->driver); +} + + + /** + * dio_bus_match - Tell if a DIO device structure has a matching DIO + * device id structure + * @ids: array of DIO device id structures to search in + * @dev: the DIO device structure to match against + * + * Used by a driver to check whether a DIO device present in the + * system is in its list of supported devices. Returns the matching + * dio_device_id structure or %NULL if there is no match. + */ + +static int dio_bus_match(struct device *dev, struct device_driver *drv) +{ + struct dio_dev *d = to_dio_dev(dev); + struct dio_driver *dio_drv = to_dio_driver(drv); + const struct dio_device_id *ids = dio_drv->id_table; + + if (!ids) + return 0; + + while (ids->id) { + if (ids->id == DIO_WILDCARD) + return 1; + if (DIO_NEEDSSECID(ids->id & 0xff)) { + if (ids->id == d->id) + return 1; + } else { + if ((ids->id & 0xff) == (d->id & 0xff)) + return 1; + } + ids++; + } + return 0; +} + + +struct bus_type dio_bus_type = { + .name = "dio", + .match = dio_bus_match +}; + + +static int __init dio_driver_init(void) +{ + return bus_register(&dio_bus_type); +} + +postcore_initcall(dio_driver_init); + +EXPORT_SYMBOL(dio_match_device); +EXPORT_SYMBOL(dio_register_driver); +EXPORT_SYMBOL(dio_unregister_driver); +EXPORT_SYMBOL(dio_dev_driver); +EXPORT_SYMBOL(dio_bus_type); |