diff options
Diffstat (limited to 'drivers/w1/w1_smem.c')
| -rw-r--r-- | drivers/w1/w1_smem.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/w1/w1_smem.c b/drivers/w1/w1_smem.c new file mode 100644 index 000000000000..ab82eb7ed74f --- /dev/null +++ b/drivers/w1/w1_smem.c @@ -0,0 +1,118 @@ +/* + * w1_smem.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 smems 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 <asm/types.h> + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> + +#include "w1.h" +#include "w1_io.h" +#include "w1_int.h" +#include "w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); +MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); + +static ssize_t w1_smem_read_name(struct device *, char *); +static ssize_t w1_smem_read_val(struct device *, char *); +static ssize_t w1_smem_read_bin(struct kobject *, char *, loff_t, size_t); + +static struct w1_family_ops w1_smem_fops = { + .rname = &w1_smem_read_name, + .rbin = &w1_smem_read_bin, + .rval = &w1_smem_read_val, + .rvalname = "id", +}; + +static ssize_t w1_smem_read_name(struct device *dev, char *buf) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + return sprintf(buf, "%s\n", sl->name); +} + +static ssize_t w1_smem_read_val(struct device *dev, char *buf) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + int i; + ssize_t count = 0; + + for (i = 0; i < 9; ++i) + count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]); + count += sprintf(buf + count, "\n"); + + return count; +} + +static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count) +{ + struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj), + struct w1_slave, dev); + int i; + + atomic_inc(&sl->refcnt); + if (down_interruptible(&sl->master->mutex)) { + count = 0; + goto out_dec; + } + + if (off > W1_SLAVE_DATA_SIZE) { + count = 0; + goto out; + } + if (off + count > W1_SLAVE_DATA_SIZE) { + count = 0; + goto out; + } + for (i = 0; i < 9; ++i) + count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]); + count += sprintf(buf + count, "\n"); + +out: + up(&sl->master->mutex); +out_dec: + atomic_dec(&sl->refcnt); + + return count; +} + +static struct w1_family w1_smem_family = { + .fid = W1_FAMILY_SMEM, + .fops = &w1_smem_fops, +}; + +static int __init w1_smem_init(void) +{ + return w1_register_family(&w1_smem_family); +} + +static void __exit w1_smem_fini(void) +{ + w1_unregister_family(&w1_smem_family); +} + +module_init(w1_smem_init); +module_exit(w1_smem_fini); |