1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Hardware monitoring driver for BEL PFE family power supplies. 4 * 5 * Copyright (c) 2019 Facebook Inc. 6 */ 7 8 #include <linux/err.h> 9 #include <linux/i2c.h> 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/pmbus.h> 14 15 #include "pmbus.h" 16 17 enum chips {pfe1100, pfe3000}; 18 19 /* 20 * Disable status check because some devices report communication error 21 * (invalid command) for VOUT_MODE command (0x20) although the correct 22 * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear 23 * mode. 24 * This affects both pfe3000 and pfe1100. 25 */ 26 static struct pmbus_platform_data pfe_plat_data = { 27 .flags = PMBUS_SKIP_STATUS_CHECK, 28 }; 29 30 static struct pmbus_driver_info pfe_driver_info[] = { 31 [pfe1100] = { 32 .pages = 1, 33 .format[PSC_VOLTAGE_IN] = linear, 34 .format[PSC_VOLTAGE_OUT] = linear, 35 .format[PSC_CURRENT_IN] = linear, 36 .format[PSC_CURRENT_OUT] = linear, 37 .format[PSC_POWER] = linear, 38 .format[PSC_TEMPERATURE] = linear, 39 .format[PSC_FAN] = linear, 40 41 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 42 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 43 PMBUS_HAVE_POUT | 44 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | 45 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 46 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | 47 PMBUS_HAVE_STATUS_TEMP | 48 PMBUS_HAVE_FAN12, 49 }, 50 51 [pfe3000] = { 52 .pages = 7, 53 .format[PSC_VOLTAGE_IN] = linear, 54 .format[PSC_VOLTAGE_OUT] = linear, 55 .format[PSC_CURRENT_IN] = linear, 56 .format[PSC_CURRENT_OUT] = linear, 57 .format[PSC_POWER] = linear, 58 .format[PSC_TEMPERATURE] = linear, 59 .format[PSC_FAN] = linear, 60 61 /* Page 0: V1. */ 62 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 63 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 64 PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 | 65 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | 66 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 67 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | 68 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP | 69 PMBUS_HAVE_VCAP, 70 71 /* Page 1: Vsb. */ 72 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 73 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 74 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 75 PMBUS_HAVE_POUT, 76 77 /* 78 * Page 2: V1 Ishare. 79 * Page 3: Reserved. 80 * Page 4: V1 Cathode. 81 * Page 5: Vsb Cathode. 82 * Page 6: V1 Sense. 83 */ 84 .func[2] = PMBUS_HAVE_VOUT, 85 .func[4] = PMBUS_HAVE_VOUT, 86 .func[5] = PMBUS_HAVE_VOUT, 87 .func[6] = PMBUS_HAVE_VOUT, 88 }, 89 }; 90 91 static const struct i2c_device_id pfe_device_id[]; 92 93 static int pfe_pmbus_probe(struct i2c_client *client) 94 { 95 int model; 96 97 model = (int)i2c_match_id(pfe_device_id, client)->driver_data; 98 client->dev.platform_data = &pfe_plat_data; 99 100 /* 101 * PFE3000-12-069RA devices may not stay in page 0 during device 102 * probe which leads to probe failure (read status word failed). 103 * So let's set the device to page 0 at the beginning. 104 */ 105 if (model == pfe3000) 106 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); 107 108 return pmbus_do_probe(client, &pfe_driver_info[model]); 109 } 110 111 static const struct i2c_device_id pfe_device_id[] = { 112 {"pfe1100", pfe1100}, 113 {"pfe3000", pfe3000}, 114 {} 115 }; 116 117 MODULE_DEVICE_TABLE(i2c, pfe_device_id); 118 119 static struct i2c_driver pfe_pmbus_driver = { 120 .driver = { 121 .name = "bel-pfe", 122 }, 123 .probe = pfe_pmbus_probe, 124 .id_table = pfe_device_id, 125 }; 126 127 module_i2c_driver(pfe_pmbus_driver); 128 129 MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>"); 130 MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies"); 131 MODULE_LICENSE("GPL"); 132 MODULE_IMPORT_NS(PMBUS); 133