14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * You should have received a copy of the GNU General Public License
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
38 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
41  * If it was disabled a parasite powered device might not get the require
42  * current to do a temperature conversion.  If it is enabled parasite powered
43  * devices have a better chance of getting the current required.
46 module_param_named(strong_pullup, w1_strong_pullup, int, 0);
48 static u8 bad_roms[][9] = {
49 				{0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
61 	return device_create_file(&sl->dev, &w1_therm_attr);  in w1_therm_add_slave()
66 	device_remove_file(&sl->dev, &w1_therm_attr);  in w1_therm_remove_slave()
98 	struct w1_family	*f;  member
99 	int			(*convert)(u8 rom[9]);
103 static inline int w1_DS18B20_convert_temp(u8 rom[9]);
104 static inline int w1_DS18S20_convert_temp(u8 rom[9]);
108 		.f		= &w1_therm_family_DS18S20,
112 		.f		= &w1_therm_family_DS1822,
116 		.f		= &w1_therm_family_DS18B20,
120 		.f		= &w1_therm_family_DS28EA00,
125 static inline int w1_DS18B20_convert_temp(u8 rom[9])  in w1_DS18B20_convert_temp()  argument
131 static inline int w1_DS18S20_convert_temp(u8 rom[9])  in w1_DS18S20_convert_temp()  argument
136 		return 0;  in w1_DS18S20_convert_temp()
138 	if (rom[1] == 0)  in w1_DS18S20_convert_temp()
139 		t = ((s32)rom[0] >> 1)*1000;  in w1_DS18S20_convert_temp()
141 		t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);  in w1_DS18S20_convert_temp()
143 	t -= 250;  in w1_DS18S20_convert_temp()
144 	h = 1000*((s32)rom[7] - (s32)rom[6]);  in w1_DS18S20_convert_temp()
151 static inline int w1_convert_temp(u8 rom[9], u8 fid)  in w1_convert_temp()  argument
155 	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)  in w1_convert_temp()
156 		if (w1_therm_families[i].f->fid == fid)  in w1_convert_temp()
159 	return 0;  in w1_convert_temp()
162 static int w1_therm_check_rom(u8 rom[9])  in w1_therm_check_rom()  argument
166 	for (i=0; i<sizeof(bad_roms)/9; ++i)  in w1_therm_check_rom()
167 		if (!memcmp(bad_roms[i], rom, 9))  in w1_therm_check_rom()
170 	return 0;  in w1_therm_check_rom()
177 	struct w1_master *dev = sl->master;  in w1_therm_read()
178 	u8 rom[9], crc, verdict, external_power;  in w1_therm_read()
182 	i = mutex_lock_interruptible(&dev->mutex);  in w1_therm_read()
183 	if (i != 0)  in w1_therm_read()
186 	memset(rom, 0, sizeof(rom));  in w1_therm_read()
188 	verdict = 0;  in w1_therm_read()
189 	crc = 0;  in w1_therm_read()
191 	while (max_trying--) {  in w1_therm_read()
193 			int count = 0;  in w1_therm_read()
210 				mutex_unlock(&dev->mutex);  in w1_therm_read()
213 				if (sleep_rem != 0)  in w1_therm_read()
214 					return -EINTR;  in w1_therm_read()
216 				i = mutex_lock_interruptible(&dev->mutex);  in w1_therm_read()
217 				if (i != 0)  in w1_therm_read()
221 				if (sleep_rem != 0) {  in w1_therm_read()
222 					mutex_unlock(&dev->mutex);  in w1_therm_read()
223 					return -EINTR;  in w1_therm_read()
230 				if ((count = w1_read_block(dev, rom, 9)) != 9) {  in w1_therm_read()
232 						"returned %u instead of 9.\n",  in w1_therm_read()
247 	for (i = 0; i < 9; ++i)  in w1_therm_read()
248 		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", rom[i]);  in w1_therm_read()
249 	c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",  in w1_therm_read()
252 		memcpy(sl->rom, rom, sizeof(sl->rom));  in w1_therm_read()
256 	for (i = 0; i < 9; ++i)  in w1_therm_read()
257 		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", sl->rom[i]);  in w1_therm_read()
259 	c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",  in w1_therm_read()
260 		w1_convert_temp(rom, sl->family->fid));  in w1_therm_read()
261 	mutex_unlock(&dev->mutex);  in w1_therm_read()
263 	return PAGE_SIZE - c;  in w1_therm_read()
270 	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {  in w1_therm_init()
271 		err = w1_register_family(w1_therm_families[i].f);  in w1_therm_init()
276 	return 0;  in w1_therm_init()
283 	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)  in w1_therm_fini()
285 			w1_unregister_family(w1_therm_families[i].f);  in w1_therm_fini()