1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for PMBus devices 4 * 5 * Copyright (c) 2010, 2011 Ericsson AB. 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/err.h> 12 #include <linux/slab.h> 13 #include <linux/mutex.h> 14 #include <linux/i2c.h> 15 #include <linux/pmbus.h> 16 #include "pmbus.h" 17 18 struct pmbus_device_info { 19 int pages; 20 u32 flags; 21 }; 22 23 /* 24 * Find sensor groups and status registers on each page. 25 */ 26 static void pmbus_find_sensor_groups(struct i2c_client *client, 27 struct pmbus_driver_info *info) 28 { 29 int page; 30 31 /* Sensors detected on page 0 only */ 32 if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN)) 33 info->func[0] |= PMBUS_HAVE_VIN; 34 if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP)) 35 info->func[0] |= PMBUS_HAVE_VCAP; 36 if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN)) 37 info->func[0] |= PMBUS_HAVE_IIN; 38 if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN)) 39 info->func[0] |= PMBUS_HAVE_PIN; 40 if (info->func[0] 41 && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT)) 42 info->func[0] |= PMBUS_HAVE_STATUS_INPUT; 43 if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) && 44 pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) { 45 info->func[0] |= PMBUS_HAVE_FAN12; 46 if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12)) 47 info->func[0] |= PMBUS_HAVE_STATUS_FAN12; 48 } 49 if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) && 50 pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) { 51 info->func[0] |= PMBUS_HAVE_FAN34; 52 if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34)) 53 info->func[0] |= PMBUS_HAVE_STATUS_FAN34; 54 } 55 if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1)) 56 info->func[0] |= PMBUS_HAVE_TEMP; 57 if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2)) 58 info->func[0] |= PMBUS_HAVE_TEMP2; 59 if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3)) 60 info->func[0] |= PMBUS_HAVE_TEMP3; 61 if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 62 | PMBUS_HAVE_TEMP3) 63 && pmbus_check_byte_register(client, 0, 64 PMBUS_STATUS_TEMPERATURE)) 65 info->func[0] |= PMBUS_HAVE_STATUS_TEMP; 66 67 /* Sensors detected on all pages */ 68 for (page = 0; page < info->pages; page++) { 69 if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) { 70 info->func[page] |= PMBUS_HAVE_VOUT; 71 if (pmbus_check_byte_register(client, page, 72 PMBUS_STATUS_VOUT)) 73 info->func[page] |= PMBUS_HAVE_STATUS_VOUT; 74 } 75 if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) { 76 info->func[page] |= PMBUS_HAVE_IOUT; 77 if (pmbus_check_byte_register(client, 0, 78 PMBUS_STATUS_IOUT)) 79 info->func[page] |= PMBUS_HAVE_STATUS_IOUT; 80 } 81 if (pmbus_check_word_register(client, page, PMBUS_READ_POUT)) 82 info->func[page] |= PMBUS_HAVE_POUT; 83 } 84 } 85 86 /* 87 * Identify chip parameters. 88 */ 89 static int pmbus_identify(struct i2c_client *client, 90 struct pmbus_driver_info *info) 91 { 92 int ret = 0; 93 94 if (!info->pages) { 95 /* 96 * Check if the PAGE command is supported. If it is, 97 * keep setting the page number until it fails or until the 98 * maximum number of pages has been reached. Assume that 99 * this is the number of pages supported by the chip. 100 */ 101 if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) { 102 int page; 103 104 info->pages = PMBUS_PAGES; 105 106 for (page = 1; page < PMBUS_PAGES; page++) { 107 if (pmbus_set_page(client, page, 0xff) < 0) 108 break; 109 } 110 pmbus_set_page(client, 0, 0xff); 111 info->pages = page; 112 } else { 113 info->pages = 1; 114 } 115 116 pmbus_clear_faults(client); 117 } 118 119 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) { 120 int vout_mode, i; 121 122 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); 123 if (vout_mode >= 0 && vout_mode != 0xff) { 124 switch (vout_mode >> 5) { 125 case 0: 126 break; 127 case 1: 128 info->format[PSC_VOLTAGE_OUT] = vid; 129 for (i = 0; i < info->pages; i++) 130 info->vrm_version[i] = vr11; 131 break; 132 case 2: 133 info->format[PSC_VOLTAGE_OUT] = direct; 134 break; 135 default: 136 ret = -ENODEV; 137 goto abort; 138 } 139 } 140 } 141 142 /* 143 * We should check if the COEFFICIENTS register is supported. 144 * If it is, and the chip is configured for direct mode, we can read 145 * the coefficients from the chip, one set per group of sensor 146 * registers. 147 * 148 * To do this, we will need access to a chip which actually supports the 149 * COEFFICIENTS command, since the command is too complex to implement 150 * without testing it. Until then, abort if a chip configured for direct 151 * mode was detected. 152 */ 153 if (info->format[PSC_VOLTAGE_OUT] == direct) { 154 ret = -ENODEV; 155 goto abort; 156 } 157 158 /* Try to find sensor groups */ 159 pmbus_find_sensor_groups(client, info); 160 abort: 161 return ret; 162 } 163 164 static int pmbus_probe(struct i2c_client *client) 165 { 166 struct pmbus_driver_info *info; 167 struct pmbus_platform_data *pdata = NULL; 168 struct device *dev = &client->dev; 169 struct pmbus_device_info *device_info; 170 171 info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL); 172 if (!info) 173 return -ENOMEM; 174 175 device_info = (struct pmbus_device_info *)i2c_get_match_data(client); 176 if (device_info->flags) { 177 pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data), 178 GFP_KERNEL); 179 if (!pdata) 180 return -ENOMEM; 181 182 pdata->flags = device_info->flags; 183 } 184 185 info->pages = device_info->pages; 186 info->identify = pmbus_identify; 187 dev->platform_data = pdata; 188 189 return pmbus_do_probe(client, info); 190 } 191 192 static const struct pmbus_device_info pmbus_info_one = { 193 .pages = 1, 194 .flags = 0 195 }; 196 197 static const struct pmbus_device_info pmbus_info_zero = { 198 .pages = 0, 199 .flags = 0 200 }; 201 202 static const struct pmbus_device_info pmbus_info_one_skip = { 203 .pages = 1, 204 .flags = PMBUS_SKIP_STATUS_CHECK 205 }; 206 207 static const struct pmbus_device_info pmbus_info_one_status = { 208 .pages = 1, 209 .flags = PMBUS_READ_STATUS_AFTER_FAILED_CHECK 210 }; 211 212 /* 213 * Use driver_data to set the number of pages supported by the chip. 214 */ 215 static const struct i2c_device_id pmbus_id[] = { 216 { .name = "adp4000", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 217 { .name = "bmr310", .driver_data = (kernel_ulong_t)&pmbus_info_one_status }, 218 { .name = "bmr316", .driver_data = (kernel_ulong_t)&pmbus_info_one}, 219 { .name = "bmr321", .driver_data = (kernel_ulong_t)&pmbus_info_one}, 220 { .name = "bmr350", .driver_data = (kernel_ulong_t)&pmbus_info_one}, 221 { .name = "bmr351", .driver_data = (kernel_ulong_t)&pmbus_info_one}, 222 { .name = "bmr453", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 223 { .name = "bmr454", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 224 { .name = "bmr456", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 225 { .name = "bmr457", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 226 { .name = "bmr458", .driver_data = (kernel_ulong_t)&pmbus_info_one_status }, 227 { .name = "bmr480", .driver_data = (kernel_ulong_t)&pmbus_info_one_status }, 228 { .name = "bmr490", .driver_data = (kernel_ulong_t)&pmbus_info_one_status }, 229 { .name = "bmr491", .driver_data = (kernel_ulong_t)&pmbus_info_one_status }, 230 { .name = "bmr492", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 231 { .name = "dps460", .driver_data = (kernel_ulong_t)&pmbus_info_one_skip }, 232 { .name = "dps650ab", .driver_data = (kernel_ulong_t)&pmbus_info_one_skip }, 233 { .name = "dps800", .driver_data = (kernel_ulong_t)&pmbus_info_one_skip }, 234 { .name = "max20796", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 235 { .name = "mdt040", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 236 { .name = "ncp4200", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 237 { .name = "ncp4208", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 238 { .name = "pdt003", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 239 { .name = "pdt006", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 240 { .name = "pdt012", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 241 { .name = "pmbus", .driver_data = (kernel_ulong_t)&pmbus_info_zero }, 242 { .name = "sgd009", .driver_data = (kernel_ulong_t)&pmbus_info_one_skip }, 243 { .name = "tps40400", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 244 { .name = "tps544b20", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 245 { .name = "tps544b25", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 246 { .name = "tps544c20", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 247 { .name = "tps544c25", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 248 { .name = "udt020", .driver_data = (kernel_ulong_t)&pmbus_info_one }, 249 { } 250 }; 251 252 MODULE_DEVICE_TABLE(i2c, pmbus_id); 253 254 /* This is the driver that will be inserted */ 255 static struct i2c_driver pmbus_driver = { 256 .driver = { 257 .name = "pmbus", 258 }, 259 .probe = pmbus_probe, 260 .id_table = pmbus_id, 261 }; 262 263 module_i2c_driver(pmbus_driver); 264 265 MODULE_AUTHOR("Guenter Roeck"); 266 MODULE_DESCRIPTION("Generic PMBus driver"); 267 MODULE_LICENSE("GPL"); 268 MODULE_IMPORT_NS("PMBUS"); 269