1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor 4 * 5 * Copyright (c) 2022 9elements GmbH 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/i2c.h> 10 #include <linux/module.h> 11 #include <linux/pmbus.h> 12 #include <linux/regulator/driver.h> 13 #include "pmbus.h" 14 15 /* 16 * The capability command is only supported at page 0. Probing the device while 17 * the page register is set to 1 will falsely enable PEC support. Disable 18 * capability probing accordingly, since the PLI1209BC does not have any 19 * additional capabilities. 20 */ 21 static struct pmbus_platform_data pli1209bc_plat_data = { 22 .flags = PMBUS_NO_CAPABILITY, 23 }; 24 25 static int pli1209bc_read_word_data(struct i2c_client *client, int page, 26 int phase, int reg) 27 { 28 int data; 29 30 switch (reg) { 31 /* PMBUS_READ_POUT uses a direct format with R=0 */ 32 case PMBUS_READ_POUT: 33 data = pmbus_read_word_data(client, page, phase, reg); 34 if (data < 0) 35 return data; 36 data = sign_extend32(data, 15) * 10; 37 return clamp_val(data, -32768, 32767) & 0xffff; 38 /* 39 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data 40 * when the BCM is turned off. Since it is not possible to return 41 * ENODATA error, return zero instead. 42 */ 43 case PMBUS_READ_VOUT: 44 case PMBUS_READ_TEMPERATURE_1: 45 data = pmbus_read_word_data(client, page, phase, 46 PMBUS_STATUS_WORD); 47 if (data < 0) 48 return data; 49 if (data & PB_STATUS_POWER_GOOD_N) 50 return 0; 51 return pmbus_read_word_data(client, page, phase, reg); 52 default: 53 return -ENODATA; 54 } 55 } 56 57 static int pli1209bc_write_byte(struct i2c_client *client, int page, u8 reg) 58 { 59 int ret; 60 61 switch (reg) { 62 case PMBUS_CLEAR_FAULTS: 63 ret = pmbus_write_byte(client, page, reg); 64 /* 65 * PLI1209 takes 230 usec to execute the CLEAR_FAULTS command. 66 * During that time it's busy and NACKs all requests on the 67 * SMBUS interface. It also NACKs reads on PMBUS_STATUS_BYTE 68 * making it impossible to poll the BUSY flag. 69 * 70 * Just wait for not BUSY unconditionally. 71 */ 72 usleep_range(250, 300); 73 break; 74 default: 75 ret = -ENODATA; 76 break; 77 } 78 return ret; 79 } 80 81 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 82 static const struct regulator_desc pli1209bc_reg_desc = { 83 .name = "vout2", 84 .id = 1, 85 .of_match = of_match_ptr("vout2"), 86 .regulators_node = of_match_ptr("regulators"), 87 .ops = &pmbus_regulator_ops, 88 .type = REGULATOR_VOLTAGE, 89 .owner = THIS_MODULE, 90 }; 91 #endif 92 93 static struct pmbus_driver_info pli1209bc_info = { 94 .pages = 2, 95 .format[PSC_VOLTAGE_IN] = direct, 96 .format[PSC_VOLTAGE_OUT] = direct, 97 .format[PSC_CURRENT_IN] = direct, 98 .format[PSC_CURRENT_OUT] = direct, 99 .format[PSC_POWER] = direct, 100 .format[PSC_TEMPERATURE] = direct, 101 .m[PSC_VOLTAGE_IN] = 1, 102 .b[PSC_VOLTAGE_IN] = 0, 103 .R[PSC_VOLTAGE_IN] = 1, 104 .m[PSC_VOLTAGE_OUT] = 1, 105 .b[PSC_VOLTAGE_OUT] = 0, 106 .R[PSC_VOLTAGE_OUT] = 1, 107 .m[PSC_CURRENT_IN] = 1, 108 .b[PSC_CURRENT_IN] = 0, 109 .R[PSC_CURRENT_IN] = 3, 110 .m[PSC_CURRENT_OUT] = 1, 111 .b[PSC_CURRENT_OUT] = 0, 112 .R[PSC_CURRENT_OUT] = 2, 113 .m[PSC_POWER] = 1, 114 .b[PSC_POWER] = 0, 115 .R[PSC_POWER] = 1, 116 .m[PSC_TEMPERATURE] = 1, 117 .b[PSC_TEMPERATURE] = 0, 118 .R[PSC_TEMPERATURE] = 0, 119 /* 120 * Page 0 sums up all attributes except voltage readings. 121 * The pli1209 digital supervisor only contains a single BCM, making 122 * page 0 redundant. 123 */ 124 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT 125 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT 126 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT 127 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 128 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT, 129 .read_word_data = pli1209bc_read_word_data, 130 .write_byte = pli1209bc_write_byte, 131 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR) 132 .num_regulators = 1, 133 .reg_desc = &pli1209bc_reg_desc, 134 #endif 135 }; 136 137 static int pli1209bc_probe(struct i2c_client *client) 138 { 139 client->dev.platform_data = &pli1209bc_plat_data; 140 return pmbus_do_probe(client, &pli1209bc_info); 141 } 142 143 static const struct i2c_device_id pli1209bc_id[] = { 144 {"pli1209bc", 0}, 145 {} 146 }; 147 148 MODULE_DEVICE_TABLE(i2c, pli1209bc_id); 149 150 #ifdef CONFIG_OF 151 static const struct of_device_id pli1209bc_of_match[] = { 152 { .compatible = "vicor,pli1209bc" }, 153 { }, 154 }; 155 MODULE_DEVICE_TABLE(of, pli1209bc_of_match); 156 #endif 157 158 static struct i2c_driver pli1209bc_driver = { 159 .driver = { 160 .name = "pli1209bc", 161 .of_match_table = of_match_ptr(pli1209bc_of_match), 162 }, 163 .probe = pli1209bc_probe, 164 .id_table = pli1209bc_id, 165 }; 166 167 module_i2c_driver(pli1209bc_driver); 168 169 MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>"); 170 MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC"); 171 MODULE_LICENSE("GPL"); 172 MODULE_IMPORT_NS(PMBUS); 173