1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for MPS MPQ8785 Step-Down Converter 4 */ 5 6 #include <linux/i2c.h> 7 #include <linux/module.h> 8 #include <linux/of_device.h> 9 #include "pmbus.h" 10 11 static int mpq8785_identify(struct i2c_client *client, 12 struct pmbus_driver_info *info) 13 { 14 int vout_mode; 15 16 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); 17 if (vout_mode < 0 || vout_mode == 0xff) 18 return vout_mode < 0 ? vout_mode : -ENODEV; 19 switch (vout_mode >> 5) { 20 case 0: 21 info->format[PSC_VOLTAGE_OUT] = linear; 22 break; 23 case 1: 24 case 2: 25 info->format[PSC_VOLTAGE_OUT] = direct, 26 info->m[PSC_VOLTAGE_OUT] = 64; 27 info->b[PSC_VOLTAGE_OUT] = 0; 28 info->R[PSC_VOLTAGE_OUT] = 1; 29 break; 30 default: 31 return -ENODEV; 32 } 33 34 return 0; 35 }; 36 37 static struct pmbus_driver_info mpq8785_info = { 38 .pages = 1, 39 .format[PSC_VOLTAGE_IN] = direct, 40 .format[PSC_CURRENT_OUT] = direct, 41 .format[PSC_TEMPERATURE] = direct, 42 .m[PSC_VOLTAGE_IN] = 4, 43 .b[PSC_VOLTAGE_IN] = 0, 44 .R[PSC_VOLTAGE_IN] = 1, 45 .m[PSC_CURRENT_OUT] = 16, 46 .b[PSC_CURRENT_OUT] = 0, 47 .R[PSC_CURRENT_OUT] = 0, 48 .m[PSC_TEMPERATURE] = 1, 49 .b[PSC_TEMPERATURE] = 0, 50 .R[PSC_TEMPERATURE] = 0, 51 .func[0] = 52 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | 53 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 54 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 55 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 56 .identify = mpq8785_identify, 57 }; 58 59 static int mpq8785_probe(struct i2c_client *client) 60 { 61 return pmbus_do_probe(client, &mpq8785_info); 62 }; 63 64 static const struct i2c_device_id mpq8785_id[] = { 65 { "mpq8785" }, 66 { }, 67 }; 68 MODULE_DEVICE_TABLE(i2c, mpq8785_id); 69 70 static const struct of_device_id __maybe_unused mpq8785_of_match[] = { 71 { .compatible = "mps,mpq8785" }, 72 {} 73 }; 74 MODULE_DEVICE_TABLE(of, mpq8785_of_match); 75 76 static struct i2c_driver mpq8785_driver = { 77 .driver = { 78 .name = "mpq8785", 79 .of_match_table = of_match_ptr(mpq8785_of_match), 80 }, 81 .probe = mpq8785_probe, 82 .id_table = mpq8785_id, 83 }; 84 85 module_i2c_driver(mpq8785_driver); 86 87 MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>"); 88 MODULE_DESCRIPTION("PMBus driver for MPS MPQ8785"); 89 MODULE_LICENSE("GPL"); 90 MODULE_IMPORT_NS(PMBUS); 91