1 /* 2 * Hardware monitoring driver for Maxim MAX34440/MAX34441 3 * 4 * Copyright (c) 2011 Ericsson AB. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/err.h> 25 #include <linux/i2c.h> 26 #include "pmbus.h" 27 28 enum chips { max34440, max34441 }; 29 30 #define MAX34440_MFR_VOUT_PEAK 0xd4 31 #define MAX34440_MFR_IOUT_PEAK 0xd5 32 #define MAX34440_MFR_TEMPERATURE_PEAK 0xd6 33 34 #define MAX34440_STATUS_OC_WARN (1 << 0) 35 #define MAX34440_STATUS_OC_FAULT (1 << 1) 36 #define MAX34440_STATUS_OT_FAULT (1 << 5) 37 #define MAX34440_STATUS_OT_WARN (1 << 6) 38 39 static int max34440_read_word_data(struct i2c_client *client, int page, int reg) 40 { 41 int ret; 42 43 switch (reg) { 44 case PMBUS_VIRT_READ_VOUT_MAX: 45 ret = pmbus_read_word_data(client, page, 46 MAX34440_MFR_VOUT_PEAK); 47 break; 48 case PMBUS_VIRT_READ_IOUT_MAX: 49 ret = pmbus_read_word_data(client, page, 50 MAX34440_MFR_IOUT_PEAK); 51 break; 52 case PMBUS_VIRT_READ_TEMP_MAX: 53 ret = pmbus_read_word_data(client, page, 54 MAX34440_MFR_TEMPERATURE_PEAK); 55 break; 56 case PMBUS_VIRT_RESET_VOUT_HISTORY: 57 case PMBUS_VIRT_RESET_IOUT_HISTORY: 58 case PMBUS_VIRT_RESET_TEMP_HISTORY: 59 ret = 0; 60 break; 61 default: 62 ret = -ENODATA; 63 break; 64 } 65 return ret; 66 } 67 68 static int max34440_write_word_data(struct i2c_client *client, int page, 69 int reg, u16 word) 70 { 71 int ret; 72 73 switch (reg) { 74 case PMBUS_VIRT_RESET_VOUT_HISTORY: 75 ret = pmbus_write_word_data(client, page, 76 MAX34440_MFR_VOUT_PEAK, 0); 77 break; 78 case PMBUS_VIRT_RESET_IOUT_HISTORY: 79 ret = pmbus_write_word_data(client, page, 80 MAX34440_MFR_IOUT_PEAK, 0); 81 break; 82 case PMBUS_VIRT_RESET_TEMP_HISTORY: 83 ret = pmbus_write_word_data(client, page, 84 MAX34440_MFR_TEMPERATURE_PEAK, 85 0xffff); 86 break; 87 default: 88 ret = -ENODATA; 89 break; 90 } 91 return ret; 92 } 93 94 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg) 95 { 96 int ret = 0; 97 int mfg_status; 98 99 if (page >= 0) { 100 ret = pmbus_set_page(client, page); 101 if (ret < 0) 102 return ret; 103 } 104 105 switch (reg) { 106 case PMBUS_STATUS_IOUT: 107 mfg_status = pmbus_read_word_data(client, 0, 108 PMBUS_STATUS_MFR_SPECIFIC); 109 if (mfg_status < 0) 110 return mfg_status; 111 if (mfg_status & MAX34440_STATUS_OC_WARN) 112 ret |= PB_IOUT_OC_WARNING; 113 if (mfg_status & MAX34440_STATUS_OC_FAULT) 114 ret |= PB_IOUT_OC_FAULT; 115 break; 116 case PMBUS_STATUS_TEMPERATURE: 117 mfg_status = pmbus_read_word_data(client, 0, 118 PMBUS_STATUS_MFR_SPECIFIC); 119 if (mfg_status < 0) 120 return mfg_status; 121 if (mfg_status & MAX34440_STATUS_OT_WARN) 122 ret |= PB_TEMP_OT_WARNING; 123 if (mfg_status & MAX34440_STATUS_OT_FAULT) 124 ret |= PB_TEMP_OT_FAULT; 125 break; 126 default: 127 ret = -ENODATA; 128 break; 129 } 130 return ret; 131 } 132 133 static struct pmbus_driver_info max34440_info[] = { 134 [max34440] = { 135 .pages = 14, 136 .format[PSC_VOLTAGE_IN] = direct, 137 .format[PSC_VOLTAGE_OUT] = direct, 138 .format[PSC_TEMPERATURE] = direct, 139 .format[PSC_CURRENT_OUT] = direct, 140 .m[PSC_VOLTAGE_IN] = 1, 141 .b[PSC_VOLTAGE_IN] = 0, 142 .R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */ 143 .m[PSC_VOLTAGE_OUT] = 1, 144 .b[PSC_VOLTAGE_OUT] = 0, 145 .R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */ 146 .m[PSC_CURRENT_OUT] = 1, 147 .b[PSC_CURRENT_OUT] = 0, 148 .R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */ 149 .m[PSC_TEMPERATURE] = 1, 150 .b[PSC_TEMPERATURE] = 0, 151 .R[PSC_TEMPERATURE] = 2, 152 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 153 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 154 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 155 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 156 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 157 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 158 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 159 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 160 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 161 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 162 .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 163 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 164 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 165 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 166 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 167 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 168 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 169 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 170 .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 171 .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 172 .read_byte_data = max34440_read_byte_data, 173 .read_word_data = max34440_read_word_data, 174 .write_word_data = max34440_write_word_data, 175 }, 176 [max34441] = { 177 .pages = 12, 178 .format[PSC_VOLTAGE_IN] = direct, 179 .format[PSC_VOLTAGE_OUT] = direct, 180 .format[PSC_TEMPERATURE] = direct, 181 .format[PSC_CURRENT_OUT] = direct, 182 .format[PSC_FAN] = direct, 183 .m[PSC_VOLTAGE_IN] = 1, 184 .b[PSC_VOLTAGE_IN] = 0, 185 .R[PSC_VOLTAGE_IN] = 3, 186 .m[PSC_VOLTAGE_OUT] = 1, 187 .b[PSC_VOLTAGE_OUT] = 0, 188 .R[PSC_VOLTAGE_OUT] = 3, 189 .m[PSC_CURRENT_OUT] = 1, 190 .b[PSC_CURRENT_OUT] = 0, 191 .R[PSC_CURRENT_OUT] = 3, 192 .m[PSC_TEMPERATURE] = 1, 193 .b[PSC_TEMPERATURE] = 0, 194 .R[PSC_TEMPERATURE] = 2, 195 .m[PSC_FAN] = 1, 196 .b[PSC_FAN] = 0, 197 .R[PSC_FAN] = 0, 198 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 199 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 200 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 201 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 202 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 203 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 204 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 205 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 206 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 207 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT, 208 .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, 209 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 210 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 211 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 212 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 213 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 214 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP, 215 .read_byte_data = max34440_read_byte_data, 216 .read_word_data = max34440_read_word_data, 217 .write_word_data = max34440_write_word_data, 218 }, 219 }; 220 221 static int max34440_probe(struct i2c_client *client, 222 const struct i2c_device_id *id) 223 { 224 return pmbus_do_probe(client, id, &max34440_info[id->driver_data]); 225 } 226 227 static int max34440_remove(struct i2c_client *client) 228 { 229 pmbus_do_remove(client); 230 return 0; 231 } 232 233 static const struct i2c_device_id max34440_id[] = { 234 {"max34440", max34440}, 235 {"max34441", max34441}, 236 {} 237 }; 238 239 MODULE_DEVICE_TABLE(i2c, max34440_id); 240 241 /* This is the driver that will be inserted */ 242 static struct i2c_driver max34440_driver = { 243 .driver = { 244 .name = "max34440", 245 }, 246 .probe = max34440_probe, 247 .remove = max34440_remove, 248 .id_table = max34440_id, 249 }; 250 251 static int __init max34440_init(void) 252 { 253 return i2c_add_driver(&max34440_driver); 254 } 255 256 static void __exit max34440_exit(void) 257 { 258 i2c_del_driver(&max34440_driver); 259 } 260 261 MODULE_AUTHOR("Guenter Roeck"); 262 MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441"); 263 MODULE_LICENSE("GPL"); 264 module_init(max34440_init); 265 module_exit(max34440_exit); 266