diff options
Diffstat (limited to 'drivers/w1/ds_w1_bridge.c')
| -rw-r--r-- | drivers/w1/ds_w1_bridge.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/w1/ds_w1_bridge.c b/drivers/w1/ds_w1_bridge.c new file mode 100644 index 00000000000..0baaeb5fd63 --- /dev/null +++ b/drivers/w1/ds_w1_bridge.c @@ -0,0 +1,174 @@ +/* + * ds_w1_bridge.c + * + * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/module.h> +#include <linux/types.h> + +#include "../w1/w1.h" +#include "../w1/w1_int.h" +#include "dscore.h" + +static struct ds_device *ds_dev; +static struct w1_bus_master *ds_bus_master; + +static u8 ds9490r_touch_bit(unsigned long data, u8 bit) +{ + u8 ret; + struct ds_device *dev = (struct ds_device *)data; + + if (ds_touch_bit(dev, bit, &ret)) + return 0; + + return ret; +} + +static void ds9490r_write_bit(unsigned long data, u8 bit) +{ + struct ds_device *dev = (struct ds_device *)data; + + ds_write_bit(dev, bit); +} + +static void ds9490r_write_byte(unsigned long data, u8 byte) +{ + struct ds_device *dev = (struct ds_device *)data; + + ds_write_byte(dev, byte); +} + +static u8 ds9490r_read_bit(unsigned long data) +{ + struct ds_device *dev = (struct ds_device *)data; + int err; + u8 bit = 0; + + err = ds_touch_bit(dev, 1, &bit); + if (err) + return 0; + //err = ds_read_bit(dev, &bit); + //if (err) + // return 0; + + return bit & 1; +} + +static u8 ds9490r_read_byte(unsigned long data) +{ + struct ds_device *dev = (struct ds_device *)data; + int err; + u8 byte = 0; + + err = ds_read_byte(dev, &byte); + if (err) + return 0; + + return byte; +} + +static void ds9490r_write_block(unsigned long data, u8 *buf, int len) +{ + struct ds_device *dev = (struct ds_device *)data; + + ds_write_block(dev, buf, len); +} + +static u8 ds9490r_read_block(unsigned long data, u8 *buf, int len) +{ + struct ds_device *dev = (struct ds_device *)data; + int err; + + err = ds_read_block(dev, buf, len); + if (err < 0) + return 0; + + return len; +} + +static u8 ds9490r_reset(unsigned long data) +{ + struct ds_device *dev = (struct ds_device *)data; + struct ds_status st; + int err; + + memset(&st, 0, sizeof(st)); + + err = ds_reset(dev, &st); + if (err) + return 1; + + return 0; +} + +static int __devinit ds_w1_init(void) +{ + int err; + + ds_bus_master = kmalloc(sizeof(*ds_bus_master), GFP_KERNEL); + if (!ds_bus_master) { + printk(KERN_ERR "Failed to allocate DS9490R USB<->W1 bus_master structure.\n"); + return -ENOMEM; + } + + ds_dev = ds_get_device(); + if (!ds_dev) { + printk(KERN_ERR "DS9490R is not registered.\n"); + err = -ENODEV; + goto err_out_free_bus_master; + } + + memset(ds_bus_master, 0, sizeof(*ds_bus_master)); + + ds_bus_master->data = (unsigned long)ds_dev; + ds_bus_master->touch_bit = &ds9490r_touch_bit; + ds_bus_master->read_bit = &ds9490r_read_bit; + ds_bus_master->write_bit = &ds9490r_write_bit; + ds_bus_master->read_byte = &ds9490r_read_byte; + ds_bus_master->write_byte = &ds9490r_write_byte; + ds_bus_master->read_block = &ds9490r_read_block; + ds_bus_master->write_block = &ds9490r_write_block; + ds_bus_master->reset_bus = &ds9490r_reset; + + err = w1_add_master_device(ds_bus_master); + if (err) + goto err_out_put_device; + + return 0; + +err_out_put_device: + ds_put_device(ds_dev); +err_out_free_bus_master: + kfree(ds_bus_master); + + return err; +} + +static void __devexit ds_w1_fini(void) +{ + w1_remove_master_device(ds_bus_master); + ds_put_device(ds_dev); + kfree(ds_bus_master); +} + +module_init(ds_w1_init); +module_exit(ds_w1_fini); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); |