1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2015, The Linux Foundation. All rights reserved. 4 * Copyright (c) 2018, Linaro Limited 5 */ 6 7 #include <linux/regmap.h> 8 #include <linux/bitops.h> 9 #include "tsens.h" 10 11 #define STATUS_OFFSET 0xa0 12 #define LAST_TEMP_MASK 0xfff 13 #define STATUS_VALID_BIT BIT(21) 14 15 static int get_temp_tsens_v2(struct tsens_device *tmdev, int id, int *temp) 16 { 17 struct tsens_sensor *s = &tmdev->sensor[id]; 18 u32 code; 19 unsigned int status_reg; 20 u32 last_temp = 0, last_temp2 = 0, last_temp3 = 0; 21 int ret; 22 23 status_reg = tmdev->tm_offset + STATUS_OFFSET + s->hw_id * 4; 24 ret = regmap_read(tmdev->tm_map, status_reg, &code); 25 if (ret) 26 return ret; 27 last_temp = code & LAST_TEMP_MASK; 28 if (code & STATUS_VALID_BIT) 29 goto done; 30 31 /* Try a second time */ 32 ret = regmap_read(tmdev->tm_map, status_reg, &code); 33 if (ret) 34 return ret; 35 if (code & STATUS_VALID_BIT) { 36 last_temp = code & LAST_TEMP_MASK; 37 goto done; 38 } else { 39 last_temp2 = code & LAST_TEMP_MASK; 40 } 41 42 /* Try a third/last time */ 43 ret = regmap_read(tmdev->tm_map, status_reg, &code); 44 if (ret) 45 return ret; 46 if (code & STATUS_VALID_BIT) { 47 last_temp = code & LAST_TEMP_MASK; 48 goto done; 49 } else { 50 last_temp3 = code & LAST_TEMP_MASK; 51 } 52 53 if (last_temp == last_temp2) 54 last_temp = last_temp2; 55 else if (last_temp2 == last_temp3) 56 last_temp = last_temp3; 57 done: 58 /* Convert temperature from deciCelsius to milliCelsius */ 59 *temp = sign_extend32(last_temp, fls(LAST_TEMP_MASK) - 1) * 100; 60 61 return 0; 62 } 63 64 static const struct tsens_ops ops_generic_v2 = { 65 .init = init_common, 66 .get_temp = get_temp_tsens_v2, 67 }; 68 69 const struct tsens_data data_tsens_v2 = { 70 .ops = &ops_generic_v2, 71 .reg_offsets = { [SROT_CTRL_OFFSET] = 0x4 }, 72 }; 73 74 /* Kept around for backward compatibility with old msm8996.dtsi */ 75 const struct tsens_data data_8996 = { 76 .num_sensors = 13, 77 .ops = &ops_generic_v2, 78 .reg_offsets = { [SROT_CTRL_OFFSET] = 0x4 }, 79 }; 80