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 for pfe3000 devices, because some devices report 21 * communication error (invalid command) for VOUT_MODE command (0x20) 22 * although correct VOUT_MODE (0x16) is returned: it leads to incorrect 23 * exponent in linear mode. 24 */ 25 static struct pmbus_platform_data pfe3000_plat_data = { 26 .flags = PMBUS_SKIP_STATUS_CHECK, 27 }; 28 29 static struct pmbus_driver_info pfe_driver_info[] = { 30 [pfe1100] = { 31 .pages = 1, 32 .format[PSC_VOLTAGE_IN] = linear, 33 .format[PSC_VOLTAGE_OUT] = linear, 34 .format[PSC_CURRENT_IN] = linear, 35 .format[PSC_CURRENT_OUT] = linear, 36 .format[PSC_POWER] = linear, 37 .format[PSC_TEMPERATURE] = linear, 38 .format[PSC_FAN] = linear, 39 40 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 41 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 42 PMBUS_HAVE_POUT | 43 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | 44 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 45 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | 46 PMBUS_HAVE_STATUS_TEMP | 47 PMBUS_HAVE_FAN12, 48 }, 49 50 [pfe3000] = { 51 .pages = 7, 52 .format[PSC_VOLTAGE_IN] = linear, 53 .format[PSC_VOLTAGE_OUT] = linear, 54 .format[PSC_CURRENT_IN] = linear, 55 .format[PSC_CURRENT_OUT] = linear, 56 .format[PSC_POWER] = linear, 57 .format[PSC_TEMPERATURE] = linear, 58 .format[PSC_FAN] = linear, 59 60 /* Page 0: V1. */ 61 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 62 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 63 PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 | 64 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | 65 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 66 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | 67 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP | 68 PMBUS_HAVE_VCAP, 69 70 /* Page 1: Vsb. */ 71 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 72 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 73 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | 74 PMBUS_HAVE_POUT, 75 76 /* 77 * Page 2: V1 Ishare. 78 * Page 3: Reserved. 79 * Page 4: V1 Cathode. 80 * Page 5: Vsb Cathode. 81 * Page 6: V1 Sense. 82 */ 83 .func[2] = PMBUS_HAVE_VOUT, 84 .func[4] = PMBUS_HAVE_VOUT, 85 .func[5] = PMBUS_HAVE_VOUT, 86 .func[6] = PMBUS_HAVE_VOUT, 87 }, 88 }; 89 90 static int pfe_pmbus_probe(struct i2c_client *client, 91 const struct i2c_device_id *id) 92 { 93 int model; 94 95 model = (int)id->driver_data; 96 97 /* 98 * PFE3000-12-069RA devices may not stay in page 0 during device 99 * probe which leads to probe failure (read status word failed). 100 * So let's set the device to page 0 at the beginning. 101 */ 102 if (model == pfe3000) { 103 client->dev.platform_data = &pfe3000_plat_data; 104 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); 105 } 106 107 return pmbus_do_probe(client, id, &pfe_driver_info[model]); 108 } 109 110 static const struct i2c_device_id pfe_device_id[] = { 111 {"pfe1100", pfe1100}, 112 {"pfe3000", pfe3000}, 113 {} 114 }; 115 116 MODULE_DEVICE_TABLE(i2c, pfe_device_id); 117 118 static struct i2c_driver pfe_pmbus_driver = { 119 .driver = { 120 .name = "bel-pfe", 121 }, 122 .probe = pfe_pmbus_probe, 123 .remove = pmbus_do_remove, 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