1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2993) 4 */ 5 6 #include <linux/i2c.h> 7 #include <linux/module.h> 8 #include <linux/of_device.h> 9 #include "pmbus.h" 10 11 #define MP2993_VOUT_OVUV_UINT 125 12 #define MP2993_VOUT_OVUV_DIV 64 13 #define MP2993_VIN_LIMIT_UINT 1 14 #define MP2993_VIN_LIMIT_DIV 8 15 #define MP2993_READ_VIN_UINT 1 16 #define MP2993_READ_VIN_DIV 32 17 18 #define MP2993_PAGE_NUM 2 19 20 #define MP2993_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \ 21 PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \ 22 PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \ 23 PMBUS_HAVE_IIN | \ 24 PMBUS_HAVE_STATUS_VOUT | \ 25 PMBUS_HAVE_STATUS_IOUT | \ 26 PMBUS_HAVE_STATUS_TEMP | \ 27 PMBUS_HAVE_STATUS_INPUT) 28 29 #define MP2993_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \ 30 PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \ 31 PMBUS_HAVE_STATUS_VOUT | \ 32 PMBUS_HAVE_STATUS_IOUT | \ 33 PMBUS_HAVE_STATUS_TEMP | \ 34 PMBUS_HAVE_STATUS_INPUT) 35 36 /* Converts a linear11 data exponent to a specified value */ 37 static u16 mp2993_linear11_exponent_transfer(u16 word, u16 expect_exponent) 38 { 39 s16 exponent, mantissa, target_exponent; 40 41 exponent = ((s16)word) >> 11; 42 mantissa = ((s16)((word & 0x7ff) << 5)) >> 5; 43 target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11; 44 45 if (exponent > target_exponent) 46 mantissa = mantissa << (exponent - target_exponent); 47 else 48 mantissa = mantissa >> (target_exponent - exponent); 49 50 return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800); 51 } 52 53 static int 54 mp2993_set_vout_format(struct i2c_client *client, int page, int format) 55 { 56 int ret; 57 58 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); 59 if (ret < 0) 60 return ret; 61 62 return i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, format); 63 } 64 65 static int mp2993_identify(struct i2c_client *client, struct pmbus_driver_info *info) 66 { 67 int ret; 68 69 /* Set vout to direct format for rail1. */ 70 ret = mp2993_set_vout_format(client, 0, PB_VOUT_MODE_DIRECT); 71 if (ret < 0) 72 return ret; 73 74 /* Set vout to direct format for rail2. */ 75 return mp2993_set_vout_format(client, 1, PB_VOUT_MODE_DIRECT); 76 } 77 78 static int mp2993_read_word_data(struct i2c_client *client, int page, int phase, 79 int reg) 80 { 81 int ret; 82 83 switch (reg) { 84 case PMBUS_VOUT_OV_FAULT_LIMIT: 85 case PMBUS_VOUT_UV_FAULT_LIMIT: 86 ret = pmbus_read_word_data(client, page, phase, reg); 87 if (ret < 0) 88 return ret; 89 90 ret = DIV_ROUND_CLOSEST(ret * MP2993_VOUT_OVUV_UINT, MP2993_VOUT_OVUV_DIV); 91 break; 92 case PMBUS_OT_FAULT_LIMIT: 93 case PMBUS_OT_WARN_LIMIT: 94 /* 95 * The MP2993 ot fault limit value and ot warn limit value 96 * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT 97 * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to 98 * indicates the limit value. 99 */ 100 ret = pmbus_read_word_data(client, 0, phase, reg); 101 break; 102 case PMBUS_READ_VIN: 103 /* The MP2993 vin scale is (1/32V)/Lsb */ 104 ret = pmbus_read_word_data(client, page, phase, reg); 105 if (ret < 0) 106 return ret; 107 108 ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)) * MP2993_READ_VIN_UINT, 109 MP2993_READ_VIN_DIV); 110 break; 111 case PMBUS_VIN_OV_FAULT_LIMIT: 112 case PMBUS_VIN_OV_WARN_LIMIT: 113 case PMBUS_VIN_UV_WARN_LIMIT: 114 case PMBUS_VIN_UV_FAULT_LIMIT: 115 /* The MP2993 vin limit scale is (1/8V)/Lsb */ 116 ret = pmbus_read_word_data(client, page, phase, reg); 117 if (ret < 0) 118 return ret; 119 120 ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * MP2993_VIN_LIMIT_UINT, 121 MP2993_VIN_LIMIT_DIV); 122 break; 123 case PMBUS_READ_IOUT: 124 case PMBUS_READ_IIN: 125 case PMBUS_IIN_OC_WARN_LIMIT: 126 case PMBUS_IOUT_OC_FAULT_LIMIT: 127 case PMBUS_IOUT_OC_WARN_LIMIT: 128 case PMBUS_READ_VOUT: 129 case PMBUS_READ_PIN: 130 case PMBUS_READ_POUT: 131 case PMBUS_READ_TEMPERATURE_1: 132 ret = -ENODATA; 133 break; 134 default: 135 ret = -EINVAL; 136 break; 137 } 138 139 return ret; 140 } 141 142 static int mp2993_write_word_data(struct i2c_client *client, int page, int reg, 143 u16 word) 144 { 145 int ret; 146 147 switch (reg) { 148 case PMBUS_VOUT_OV_FAULT_LIMIT: 149 case PMBUS_VOUT_UV_FAULT_LIMIT: 150 ret = DIV_ROUND_CLOSEST(word * MP2993_VOUT_OVUV_DIV, MP2993_VOUT_OVUV_UINT); 151 ret = pmbus_write_word_data(client, 0, reg, ret); 152 break; 153 case PMBUS_OT_FAULT_LIMIT: 154 case PMBUS_OT_WARN_LIMIT: 155 /* 156 * The MP2993 ot fault limit value and ot warn limit value 157 * per rail are always the same, so only PMBUS_OT_FAULT_LIMIT 158 * and PMBUS_OT_WARN_LIMIT register in page 0 are defined to 159 * config the ot limit value. 160 */ 161 ret = pmbus_write_word_data(client, 0, reg, word); 162 break; 163 case PMBUS_VIN_OV_FAULT_LIMIT: 164 case PMBUS_VIN_OV_WARN_LIMIT: 165 case PMBUS_VIN_UV_WARN_LIMIT: 166 case PMBUS_VIN_UV_FAULT_LIMIT: 167 /* The MP2993 vin limit scale is (1/8V)/Lsb */ 168 ret = pmbus_write_word_data(client, 0, reg, 169 DIV_ROUND_CLOSEST(word * MP2993_VIN_LIMIT_DIV, 170 MP2993_VIN_LIMIT_UINT)); 171 break; 172 case PMBUS_IIN_OC_WARN_LIMIT: 173 /* 174 * The PMBUS_IIN_OC_WARN_LIMIT of MP2993 is linear11 format, 175 * and the exponent is a constant value(5'b00000)， so the 176 * exponent of word parameter should be converted to 5'b00000. 177 */ 178 ret = pmbus_write_word_data(client, page, reg, 179 mp2993_linear11_exponent_transfer(word, 0x00)); 180 break; 181 // 182 case PMBUS_IOUT_OC_FAULT_LIMIT: 183 case PMBUS_IOUT_OC_WARN_LIMIT: 184 /* 185 * The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT 186 * of MP2993 can be regarded as linear11 format, and the 187 * exponent is a 5'b00001 or 5'b00000. To ensure a larger 188 * range of limit value, so the exponent of word parameter 189 * should be converted to 5'b00001. 190 */ 191 ret = pmbus_write_word_data(client, page, reg, 192 mp2993_linear11_exponent_transfer(word, 0x01)); 193 break; 194 default: 195 ret = -EINVAL; 196 break; 197 } 198 199 return ret; 200 } 201 202 static struct pmbus_driver_info mp2993_info = { 203 .pages = MP2993_PAGE_NUM, 204 .format[PSC_VOLTAGE_IN] = direct, 205 .format[PSC_CURRENT_IN] = linear, 206 .format[PSC_CURRENT_OUT] = linear, 207 .format[PSC_TEMPERATURE] = direct, 208 .format[PSC_POWER] = linear, 209 .format[PSC_VOLTAGE_OUT] = direct, 210 211 .m[PSC_VOLTAGE_OUT] = 1, 212 .R[PSC_VOLTAGE_OUT] = 3, 213 .b[PSC_VOLTAGE_OUT] = 0, 214 215 .m[PSC_VOLTAGE_IN] = 1, 216 .R[PSC_VOLTAGE_IN] = 0, 217 .b[PSC_VOLTAGE_IN] = 0, 218 219 .m[PSC_TEMPERATURE] = 1, 220 .R[PSC_TEMPERATURE] = 0, 221 .b[PSC_TEMPERATURE] = 0, 222 223 .func[0] = MP2993_RAIL1_FUNC, 224 .func[1] = MP2993_RAIL2_FUNC, 225 .read_word_data = mp2993_read_word_data, 226 .write_word_data = mp2993_write_word_data, 227 .identify = mp2993_identify, 228 }; 229 230 static int mp2993_probe(struct i2c_client *client) 231 { 232 return pmbus_do_probe(client, &mp2993_info); 233 } 234 235 static const struct i2c_device_id mp2993_id[] = { 236 { "mp2993" }, 237 { } 238 }; 239 MODULE_DEVICE_TABLE(i2c, mp2993_id); 240 241 static const struct of_device_id __maybe_unused mp2993_of_match[] = { 242 {.compatible = "mps,mp2993"}, 243 {} 244 }; 245 MODULE_DEVICE_TABLE(of, mp2993_of_match); 246 247 static struct i2c_driver mp2993_driver = { 248 .driver = { 249 .name = "mp2993", 250 .of_match_table = mp2993_of_match, 251 }, 252 .probe = mp2993_probe, 253 .id_table = mp2993_id, 254 }; 255 256 module_i2c_driver(mp2993_driver); 257 258 MODULE_AUTHOR("Noah Wang <noahwang.wang@outlook.com>"); 259 MODULE_DESCRIPTION("PMBus driver for MPS MP2993"); 260 MODULE_LICENSE("GPL"); 261 MODULE_IMPORT_NS(PMBUS); 262