| Rajendra Nayak | d059c73 | 2016-05-05 14:21:44 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/regmap.h> |
| 17 | #include "tsens.h" |
| 18 | |
| 19 | #define STATUS_OFFSET 0x10a0 |
| 20 | #define LAST_TEMP_MASK 0xfff |
| 21 | #define STATUS_VALID_BIT BIT(21) |
| 22 | #define CODE_SIGN_BIT BIT(11) |
| 23 | |
| 24 | static int get_temp_8996(struct tsens_device *tmdev, int id, int *temp) |
| 25 | { |
| 26 | struct tsens_sensor *s = &tmdev->sensor[id]; |
| 27 | u32 code; |
| 28 | unsigned int sensor_addr; |
| 29 | int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret; |
| 30 | |
| 31 | sensor_addr = STATUS_OFFSET + s->hw_id * 4; |
| 32 | ret = regmap_read(tmdev->map, sensor_addr, &code); |
| 33 | if (ret) |
| 34 | return ret; |
| 35 | last_temp = code & LAST_TEMP_MASK; |
| 36 | if (code & STATUS_VALID_BIT) |
| 37 | goto done; |
| 38 | |
| 39 | /* Try a second time */ |
| 40 | ret = regmap_read(tmdev->map, sensor_addr, &code); |
| 41 | if (ret) |
| 42 | return ret; |
| 43 | if (code & STATUS_VALID_BIT) { |
| 44 | last_temp = code & LAST_TEMP_MASK; |
| 45 | goto done; |
| 46 | } else { |
| 47 | last_temp2 = code & LAST_TEMP_MASK; |
| 48 | } |
| 49 | |
| 50 | /* Try a third/last time */ |
| 51 | ret = regmap_read(tmdev->map, sensor_addr, &code); |
| 52 | if (ret) |
| 53 | return ret; |
| 54 | if (code & STATUS_VALID_BIT) { |
| 55 | last_temp = code & LAST_TEMP_MASK; |
| 56 | goto done; |
| 57 | } else { |
| 58 | last_temp3 = code & LAST_TEMP_MASK; |
| 59 | } |
| 60 | |
| 61 | if (last_temp == last_temp2) |
| 62 | last_temp = last_temp2; |
| 63 | else if (last_temp2 == last_temp3) |
| 64 | last_temp = last_temp3; |
| 65 | done: |
| 66 | /* Code sign bit is the sign extension for a negative value */ |
| 67 | if (last_temp & CODE_SIGN_BIT) |
| 68 | last_temp |= ~CODE_SIGN_BIT; |
| 69 | |
| 70 | /* Temperatures are in deciCelicius */ |
| 71 | *temp = last_temp * 100; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| Eduardo Valentin | 032d405 | 2016-07-01 18:02:09 -0700 | [diff] [blame] | 76 | static const struct tsens_ops ops_8996 = { |
| Rajendra Nayak | d059c73 | 2016-05-05 14:21:44 +0530 | [diff] [blame] | 77 | .init = init_common, |
| 78 | .get_temp = get_temp_8996, |
| 79 | }; |
| 80 | |
| 81 | const struct tsens_data data_8996 = { |
| 82 | .num_sensors = 13, |
| 83 | .ops = &ops_8996, |
| 84 | }; |