| Ricardo Ribalda Delgado | d0039d4 | 2008-07-23 19:10:14 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2008 |
| 3 | * Ricado Ribalda-Universidad Autonoma de Madrid, ricardo.ribalda@uam.es |
| 4 | * This work has been supported by: QTechnology http://qtec.com/ |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <common.h> |
| 19 | #include <i2c.h> |
| 20 | #include <dtt.h> |
| 21 | |
| 22 | #define ADT7460_ADDRESS 0x2c |
| 23 | #define ADT7460_INVALID 128 |
| 24 | #define ADT7460_CONFIG 0x40 |
| 25 | #define ADT7460_REM1_TEMP 0x25 |
| 26 | #define ADT7460_LOCAL_TEMP 0x26 |
| 27 | #define ADT7460_REM2_TEMP 0x27 |
| 28 | |
| 29 | int dtt_read(int sensor, int reg) |
| 30 | { |
| 31 | u8 dir = reg; |
| 32 | u8 data; |
| 33 | |
| 34 | if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1) |
| 35 | return -1; |
| 36 | if (data == ADT7460_INVALID) |
| 37 | return -1; |
| 38 | |
| 39 | return data; |
| 40 | } |
| 41 | |
| 42 | int dtt_write(int sensor, int reg, int val) |
| 43 | { |
| 44 | u8 dir = reg; |
| 45 | u8 data = val; |
| 46 | |
| 47 | if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1) |
| 48 | return -1; |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | int dtt_init(void) |
| 54 | { |
| 55 | printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS); |
| 56 | |
| 57 | if (dtt_write(0, ADT7460_CONFIG, 1) == -1) { |
| 58 | puts("Error initialiting ADT7460\n"); |
| 59 | return -1; |
| 60 | } |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | int dtt_get_temp(int sensor) |
| 66 | { |
| 67 | int aux; |
| 68 | u8 table[] = |
| 69 | { ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP }; |
| 70 | |
| 71 | if (sensor > 2) { |
| 72 | puts("DTT sensor does not exist\n"); |
| 73 | return -1; |
| 74 | } |
| 75 | |
| 76 | aux = dtt_read(0, table[sensor]); |
| 77 | if (aux == -1) { |
| 78 | puts("DTT temperature read failed\n"); |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | return aux; |
| 83 | } |