1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright (c) 2025, Qualcomm Technologies, Inc. and/or its subsidiaries. 3 4 #include <linux/export.h> 5 #include <linux/module.h> 6 #include <linux/init.h> 7 #include <linux/device.h> 8 #include <linux/of.h> 9 #include <linux/printk.h> 10 11 #include "wcd-common.h" 12 13 #define WCD_MIN_MICBIAS_MV 1000 14 #define WCD_DEF_MICBIAS_MV 1800 15 #define WCD_MAX_MICBIAS_MV 2850 16 17 int wcd_get_micb_vout_ctl_val(struct device *dev, u32 micb_mv) 18 { 19 /* min micbias voltage is 1V and maximum is 2.85V */ 20 if (micb_mv < WCD_MIN_MICBIAS_MV || micb_mv > WCD_MAX_MICBIAS_MV) { 21 dev_err(dev, "Unsupported micbias voltage (%u mV)\n", micb_mv); 22 return -EINVAL; 23 } 24 25 return (micb_mv - WCD_MIN_MICBIAS_MV) / 50; 26 } 27 EXPORT_SYMBOL_GPL(wcd_get_micb_vout_ctl_val); 28 29 static int wcd_get_micbias_val(struct device *dev, int micb_num, u32 *micb_mv) 30 { 31 char micbias[64]; 32 int mv; 33 34 sprintf(micbias, "qcom,micbias%d-microvolt", micb_num); 35 36 if (of_property_read_u32(dev->of_node, micbias, &mv)) { 37 dev_err(dev, "%s value not found, using default\n", micbias); 38 mv = WCD_DEF_MICBIAS_MV; 39 } else { 40 /* convert it to milli volts */ 41 mv = mv/1000; 42 } 43 if (micb_mv) 44 *micb_mv = mv; 45 46 mv = wcd_get_micb_vout_ctl_val(dev, mv); 47 if (mv < 0) { 48 dev_err(dev, "Unsupported %s voltage (%d mV), falling back to default (%d mV)\n", 49 micbias, mv, WCD_DEF_MICBIAS_MV); 50 return wcd_get_micb_vout_ctl_val(dev, WCD_DEF_MICBIAS_MV); 51 } 52 53 return mv; 54 } 55 56 int wcd_dt_parse_micbias_info(struct wcd_common *common) 57 { 58 int i; 59 60 for (i = 0; i < common->max_bias; i++) { 61 common->micb_vout[i] = wcd_get_micbias_val(common->dev, i + 1, &common->micb_mv[i]); 62 if (common->micb_vout[i] < 0) 63 return -EINVAL; 64 } 65 66 return 0; 67 } 68 EXPORT_SYMBOL_GPL(wcd_dt_parse_micbias_info); 69 MODULE_DESCRIPTION("Common Qualcomm WCD Codec helpers driver"); 70 MODULE_LICENSE("GPL"); 71