diff options
Diffstat (limited to 'drivers/w1/w1_therm.c')
| -rw-r--r-- | drivers/w1/w1_therm.c | 100 |
1 files changed, 79 insertions, 21 deletions
diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c index 70310f7a722e..165526c9360a 100644 --- a/drivers/w1/w1_therm.c +++ b/drivers/w1/w1_therm.c @@ -1,8 +1,8 @@ /* - * w1_therm.c + * w1_therm.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 therms of the GNU General Public License as published by @@ -38,19 +38,56 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family."); static u8 bad_roms[][9] = { - {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87}, + {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87}, {} }; static ssize_t w1_therm_read_name(struct device *, struct device_attribute *attr, char *); -static ssize_t w1_therm_read_temp(struct device *, struct device_attribute *attr, char *); static ssize_t w1_therm_read_bin(struct kobject *, char *, loff_t, size_t); static struct w1_family_ops w1_therm_fops = { .rname = &w1_therm_read_name, .rbin = &w1_therm_read_bin, - .rval = &w1_therm_read_temp, - .rvalname = "temp1_input", +}; + +static struct w1_family w1_therm_family_DS18S20 = { + .fid = W1_THERM_DS18S20, + .fops = &w1_therm_fops, +}; + +static struct w1_family w1_therm_family_DS18B20 = { + .fid = W1_THERM_DS18B20, + .fops = &w1_therm_fops, +}; +static struct w1_family w1_therm_family_DS1822 = { + .fid = W1_THERM_DS1822, + .fops = &w1_therm_fops, +}; + +struct w1_therm_family_converter +{ + u8 broken; + u16 reserved; + struct w1_family *f; + int (*convert)(u8 rom[9]); +}; + +static inline int w1_DS18B20_convert_temp(u8 rom[9]); +static inline int w1_DS18S20_convert_temp(u8 rom[9]); + +static struct w1_therm_family_converter w1_therm_families[] = { + { + .f = &w1_therm_family_DS18S20, + .convert = w1_DS18S20_convert_temp + }, + { + .f = &w1_therm_family_DS1822, + .convert = w1_DS18B20_convert_temp + }, + { + .f = &w1_therm_family_DS18B20, + .convert = w1_DS18B20_convert_temp + }, }; static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *attr, char *buf) @@ -60,9 +97,19 @@ static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *a return sprintf(buf, "%s\n", sl->name); } -static inline int w1_convert_temp(u8 rom[9]) +static inline int w1_DS18B20_convert_temp(u8 rom[9]) +{ + int t = (rom[1] << 8) | rom[0]; + t /= 16; + return t; +} + +static inline int w1_DS18S20_convert_temp(u8 rom[9]) { int t, h; + + if (!rom[7]) + return 0; if (rom[1] == 0) t = ((s32)rom[0] >> 1)*1000; @@ -77,11 +124,15 @@ static inline int w1_convert_temp(u8 rom[9]) return t; } -static ssize_t w1_therm_read_temp(struct device *dev, struct device_attribute *attr, char *buf) +static inline int w1_convert_temp(u8 rom[9], u8 fid) { - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + int i; + + for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i) + if (w1_therm_families[i].f->fid == fid) + return w1_therm_families[i].convert(rom); - return sprintf(buf, "%d\n", w1_convert_temp(sl->rom)); + return 0; } static int w1_therm_check_rom(u8 rom[9]) @@ -98,7 +149,7 @@ static int w1_therm_check_rom(u8 rom[9]) static ssize_t w1_therm_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); + struct w1_slave, dev); struct w1_master *dev = sl->master; u8 rom[9], crc, verdict; int i, max_trying = 10; @@ -133,7 +184,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si unsigned int tm = 750; memcpy(&match[1], (u64 *) & sl->reg_num, 8); - + w1_write_block(dev, match, 9); w1_write_8(dev, W1_CONVERT_TEMP); @@ -146,7 +197,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si if (!w1_reset_bus (dev)) { w1_write_block(dev, match, 9); - + w1_write_8(dev, W1_READ_SCRATCHPAD); if ((count = w1_read_block(dev, rom, 9)) != 9) { dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count); @@ -176,7 +227,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si for (i = 0; i < 9; ++i) count += sprintf(buf + count, "%02x ", sl->rom[i]); - count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom)); + count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid)); out: up(&dev->mutex); out_dec: @@ -186,19 +237,26 @@ out_dec: return count; } -static struct w1_family w1_therm_family = { - .fid = W1_FAMILY_THERM, - .fops = &w1_therm_fops, -}; - static int __init w1_therm_init(void) { - return w1_register_family(&w1_therm_family); + int err, i; + + for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i) { + err = w1_register_family(w1_therm_families[i].f); + if (err) + w1_therm_families[i].broken = 1; + } + + return 0; } static void __exit w1_therm_fini(void) { - w1_unregister_family(&w1_therm_family); + int i; + + for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i) + if (!w1_therm_families[i].broken) + w1_unregister_family(w1_therm_families[i].f); } module_init(w1_therm_init); |