1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for BluTek BPA-RS600 Power Supplies 4 * 5 * Copyright 2021 Allied Telesis Labs 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/pmbus.h> 13 #include "pmbus.h" 14 15 enum chips { bpa_rs600, bpd_rs600 }; 16 17 static int bpa_rs600_read_byte_data(struct i2c_client *client, int page, int reg) 18 { 19 int ret; 20 21 if (page > 0) 22 return -ENXIO; 23 24 switch (reg) { 25 case PMBUS_FAN_CONFIG_12: 26 /* 27 * Two fans are reported in PMBUS_FAN_CONFIG_12 but there is 28 * only one fan in the module. Mask out the FAN2 bits. 29 */ 30 ret = pmbus_read_byte_data(client, 0, PMBUS_FAN_CONFIG_12); 31 if (ret >= 0) 32 ret &= ~(PB_FAN_2_INSTALLED | PB_FAN_2_PULSE_MASK); 33 break; 34 default: 35 ret = -ENODATA; 36 break; 37 } 38 39 return ret; 40 } 41 42 /* 43 * The BPA-RS600 violates the PMBus spec. Specifically it treats the 44 * mantissa as unsigned. Deal with this here to allow the PMBus core 45 * to work with correctly encoded data. 46 */ 47 static int bpa_rs600_read_vin(struct i2c_client *client) 48 { 49 int ret, exponent, mantissa; 50 51 ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_READ_VIN); 52 if (ret < 0) 53 return ret; 54 55 if (ret & BIT(10)) { 56 exponent = ret >> 11; 57 mantissa = ret & 0x7ff; 58 59 exponent++; 60 mantissa >>= 1; 61 62 ret = (exponent << 11) | mantissa; 63 } 64 65 return ret; 66 } 67 68 /* 69 * Firmware V5.70 incorrectly reports 1640W for MFR_PIN_MAX. 70 * Deal with this by returning a sensible value. 71 */ 72 static int bpa_rs600_read_pin_max(struct i2c_client *client) 73 { 74 int ret; 75 76 ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_MFR_PIN_MAX); 77 if (ret < 0) 78 return ret; 79 80 /* Detect invalid 1640W (linear encoding) */ 81 if (ret == 0x0b34) 82 /* Report 700W (linear encoding) */ 83 return 0x095e; 84 85 return ret; 86 } 87 88 static int bpa_rs600_read_word_data(struct i2c_client *client, int page, int phase, int reg) 89 { 90 int ret; 91 92 if (page > 0) 93 return -ENXIO; 94 95 switch (reg) { 96 case PMBUS_VIN_UV_WARN_LIMIT: 97 case PMBUS_VIN_OV_WARN_LIMIT: 98 case PMBUS_VOUT_UV_WARN_LIMIT: 99 case PMBUS_VOUT_OV_WARN_LIMIT: 100 case PMBUS_IIN_OC_WARN_LIMIT: 101 case PMBUS_IOUT_OC_WARN_LIMIT: 102 case PMBUS_PIN_OP_WARN_LIMIT: 103 case PMBUS_POUT_OP_WARN_LIMIT: 104 case PMBUS_VIN_UV_FAULT_LIMIT: 105 case PMBUS_VIN_OV_FAULT_LIMIT: 106 case PMBUS_VOUT_UV_FAULT_LIMIT: 107 case PMBUS_VOUT_OV_FAULT_LIMIT: 108 /* These commands return data but it is invalid/un-documented */ 109 ret = -ENXIO; 110 break; 111 case PMBUS_READ_VIN: 112 ret = bpa_rs600_read_vin(client); 113 break; 114 case PMBUS_MFR_PIN_MAX: 115 ret = bpa_rs600_read_pin_max(client); 116 break; 117 default: 118 if (reg >= PMBUS_VIRT_BASE) 119 ret = -ENXIO; 120 else 121 ret = -ENODATA; 122 break; 123 } 124 125 return ret; 126 } 127 128 static struct pmbus_driver_info bpa_rs600_info = { 129 .pages = 1, 130 .format[PSC_VOLTAGE_IN] = linear, 131 .format[PSC_VOLTAGE_OUT] = linear, 132 .format[PSC_CURRENT_IN] = linear, 133 .format[PSC_CURRENT_OUT] = linear, 134 .format[PSC_POWER] = linear, 135 .format[PSC_TEMPERATURE] = linear, 136 .format[PSC_FAN] = linear, 137 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | 138 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | 139 PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | 140 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | 141 PMBUS_HAVE_FAN12 | 142 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | 143 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP | 144 PMBUS_HAVE_STATUS_FAN12, 145 .read_byte_data = bpa_rs600_read_byte_data, 146 .read_word_data = bpa_rs600_read_word_data, 147 }; 148 149 static const struct i2c_device_id bpa_rs600_id[] = { 150 { "bpa-rs600", bpa_rs600 }, 151 { "bpd-rs600", bpd_rs600 }, 152 {}, 153 }; 154 MODULE_DEVICE_TABLE(i2c, bpa_rs600_id); 155 156 static int bpa_rs600_probe(struct i2c_client *client) 157 { 158 struct device *dev = &client->dev; 159 u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; 160 int ret; 161 const struct i2c_device_id *mid; 162 163 if (!i2c_check_functionality(client->adapter, 164 I2C_FUNC_SMBUS_READ_BYTE_DATA 165 | I2C_FUNC_SMBUS_READ_WORD_DATA 166 | I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 167 return -ENODEV; 168 169 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 170 if (ret < 0) { 171 dev_err(dev, "Failed to read Manufacturer Model\n"); 172 return ret; 173 } 174 175 for (mid = bpa_rs600_id; mid->name[0]; mid++) { 176 if (!strncasecmp(buf, mid->name, strlen(mid->name))) 177 break; 178 } 179 if (!mid->name[0]) { 180 buf[ret] = '\0'; 181 dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf); 182 return -ENODEV; 183 } 184 185 return pmbus_do_probe(client, &bpa_rs600_info); 186 } 187 188 static const struct of_device_id __maybe_unused bpa_rs600_of_match[] = { 189 { .compatible = "blutek,bpa-rs600" }, 190 {}, 191 }; 192 MODULE_DEVICE_TABLE(of, bpa_rs600_of_match); 193 194 static struct i2c_driver bpa_rs600_driver = { 195 .driver = { 196 .name = "bpa-rs600", 197 .of_match_table = of_match_ptr(bpa_rs600_of_match), 198 }, 199 .probe_new = bpa_rs600_probe, 200 .id_table = bpa_rs600_id, 201 }; 202 203 module_i2c_driver(bpa_rs600_driver); 204 205 MODULE_AUTHOR("Chris Packham"); 206 MODULE_DESCRIPTION("PMBus driver for BluTek BPA-RS600"); 207 MODULE_LICENSE("GPL"); 208 MODULE_IMPORT_NS(PMBUS); 209