1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2025 Liebherr-Electronics and Drives GmbH 4 */ 5 6 #include <linux/auxiliary_bus.h> 7 #include <linux/bitfield.h> 8 #include <linux/bitops.h> 9 #include <linux/hwmon.h> 10 #include <linux/mc33xs2410.h> 11 #include <linux/module.h> 12 13 /* ctrl registers */ 14 15 #define MC33XS2410_TEMP_WT 0x29 16 #define MC33XS2410_TEMP_WT_MASK GENMASK(7, 0) 17 18 /* diag registers */ 19 20 /* chan in { 1 ... 4 } */ 21 #define MC33XS2410_OUT_STA(chan) (0x02 + (chan) - 1) 22 #define MC33XS2410_OUT_STA_OTW BIT(8) 23 24 #define MC33XS2410_TS_TEMP_DIE 0x26 25 #define MC33XS2410_TS_TEMP_MASK GENMASK(9, 0) 26 27 /* chan in { 1 ... 4 } */ 28 #define MC33XS2410_TS_TEMP(chan) (0x2f + (chan) - 1) 29 30 static const struct hwmon_channel_info * const mc33xs2410_hwmon_info[] = { 31 HWMON_CHANNEL_INFO(temp, 32 HWMON_T_LABEL | HWMON_T_INPUT, 33 HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | 34 HWMON_T_ALARM, 35 HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | 36 HWMON_T_ALARM, 37 HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | 38 HWMON_T_ALARM, 39 HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | 40 HWMON_T_ALARM), 41 NULL, 42 }; 43 44 static umode_t mc33xs2410_hwmon_is_visible(const void *data, 45 enum hwmon_sensor_types type, 46 u32 attr, int channel) 47 { 48 switch (attr) { 49 case hwmon_temp_input: 50 case hwmon_temp_alarm: 51 case hwmon_temp_label: 52 return 0444; 53 case hwmon_temp_max: 54 return 0644; 55 default: 56 return 0; 57 } 58 } 59 60 static int mc33xs2410_hwmon_read(struct device *dev, 61 enum hwmon_sensor_types type, 62 u32 attr, int channel, long *val) 63 { 64 struct spi_device *spi = dev_get_drvdata(dev); 65 u16 reg_val; 66 int ret; 67 u8 reg; 68 69 switch (attr) { 70 case hwmon_temp_input: 71 reg = (channel == 0) ? MC33XS2410_TS_TEMP_DIE : 72 MC33XS2410_TS_TEMP(channel); 73 ret = mc33xs2410_read_reg_diag(spi, reg, ®_val); 74 if (ret < 0) 75 return ret; 76 77 /* LSB is 0.25 degree celsius */ 78 *val = FIELD_GET(MC33XS2410_TS_TEMP_MASK, reg_val) * 250 - 40000; 79 return 0; 80 case hwmon_temp_alarm: 81 ret = mc33xs2410_read_reg_diag(spi, MC33XS2410_OUT_STA(channel), 82 ®_val); 83 if (ret < 0) 84 return ret; 85 86 *val = FIELD_GET(MC33XS2410_OUT_STA_OTW, reg_val); 87 return 0; 88 case hwmon_temp_max: 89 ret = mc33xs2410_read_reg_ctrl(spi, MC33XS2410_TEMP_WT, ®_val); 90 if (ret < 0) 91 return ret; 92 93 /* LSB is 1 degree celsius */ 94 *val = FIELD_GET(MC33XS2410_TEMP_WT_MASK, reg_val) * 1000 - 40000; 95 return 0; 96 default: 97 return -EOPNOTSUPP; 98 } 99 } 100 101 static int mc33xs2410_hwmon_write(struct device *dev, 102 enum hwmon_sensor_types type, u32 attr, 103 int channel, long val) 104 { 105 struct spi_device *spi = dev_get_drvdata(dev); 106 107 switch (attr) { 108 case hwmon_temp_max: 109 val = clamp_val(val, -40000, 215000); 110 111 /* LSB is 1 degree celsius */ 112 val = (val / 1000) + 40; 113 return mc33xs2410_modify_reg(spi, MC33XS2410_TEMP_WT, 114 MC33XS2410_TEMP_WT_MASK, val); 115 default: 116 return -EOPNOTSUPP; 117 } 118 } 119 120 static const char *const mc33xs2410_temp_label[] = { 121 "Central die temperature", 122 "Channel 1 temperature", 123 "Channel 2 temperature", 124 "Channel 3 temperature", 125 "Channel 4 temperature", 126 }; 127 128 static int mc33xs2410_read_string(struct device *dev, 129 enum hwmon_sensor_types type, 130 u32 attr, int channel, const char **str) 131 { 132 *str = mc33xs2410_temp_label[channel]; 133 134 return 0; 135 } 136 137 static const struct hwmon_ops mc33xs2410_hwmon_hwmon_ops = { 138 .is_visible = mc33xs2410_hwmon_is_visible, 139 .read = mc33xs2410_hwmon_read, 140 .read_string = mc33xs2410_read_string, 141 .write = mc33xs2410_hwmon_write, 142 }; 143 144 static const struct hwmon_chip_info mc33xs2410_hwmon_chip_info = { 145 .ops = &mc33xs2410_hwmon_hwmon_ops, 146 .info = mc33xs2410_hwmon_info, 147 }; 148 149 static int mc33xs2410_hwmon_probe(struct auxiliary_device *adev, 150 const struct auxiliary_device_id *id) 151 { 152 struct device *dev = &adev->dev; 153 struct spi_device *spi = container_of(dev->parent, struct spi_device, dev); 154 struct device *hwmon; 155 156 hwmon = devm_hwmon_device_register_with_info(dev, NULL, spi, 157 &mc33xs2410_hwmon_chip_info, 158 NULL); 159 return PTR_ERR_OR_ZERO(hwmon); 160 } 161 162 static const struct auxiliary_device_id mc33xs2410_hwmon_ids[] = { 163 { 164 .name = "pwm_mc33xs2410.hwmon", 165 }, 166 { } 167 }; 168 MODULE_DEVICE_TABLE(auxiliary, mc33xs2410_hwmon_ids); 169 170 static struct auxiliary_driver mc33xs2410_hwmon_driver = { 171 .probe = mc33xs2410_hwmon_probe, 172 .id_table = mc33xs2410_hwmon_ids, 173 }; 174 module_auxiliary_driver(mc33xs2410_hwmon_driver); 175 176 MODULE_DESCRIPTION("NXP MC33XS2410 hwmon driver"); 177 MODULE_AUTHOR("Dimitri Fedrau <dimitri.fedrau@liebherr.com>"); 178 MODULE_LICENSE("GPL"); 179