1 /* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor. 2 * 3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net> 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/types.h> 8 #include <linux/slab.h> 9 #include <linux/of_device.h> 10 #include <linux/io.h> 11 #include <linux/hwmon.h> 12 #include <linux/hwmon-sysfs.h> 13 14 #define DRV_MODULE_VERSION "0.1" 15 16 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 17 MODULE_DESCRIPTION("Ultra45 environmental monitor driver"); 18 MODULE_LICENSE("GPL"); 19 MODULE_VERSION(DRV_MODULE_VERSION); 20 21 /* PIC device registers */ 22 #define REG_CMD 0x00UL 23 #define REG_CMD_RESET 0x80 24 #define REG_CMD_ESTAR 0x01 25 #define REG_STAT 0x01UL 26 #define REG_STAT_FWVER 0xf0 27 #define REG_STAT_TGOOD 0x08 28 #define REG_STAT_STALE 0x04 29 #define REG_STAT_BUSY 0x02 30 #define REG_STAT_FAULT 0x01 31 #define REG_DATA 0x40UL 32 #define REG_ADDR 0x41UL 33 #define REG_SIZE 0x42UL 34 35 /* Registers accessed indirectly via REG_DATA/REG_ADDR */ 36 #define IREG_FAN0 0x00 37 #define IREG_FAN1 0x01 38 #define IREG_FAN2 0x02 39 #define IREG_FAN3 0x03 40 #define IREG_FAN4 0x04 41 #define IREG_FAN5 0x05 42 #define IREG_LCL_TEMP 0x06 43 #define IREG_RMT1_TEMP 0x07 44 #define IREG_RMT2_TEMP 0x08 45 #define IREG_RMT3_TEMP 0x09 46 #define IREG_LM95221_TEMP 0x0a 47 #define IREG_FIRE_TEMP 0x0b 48 #define IREG_LSI1064_TEMP 0x0c 49 #define IREG_FRONT_TEMP 0x0d 50 #define IREG_FAN_STAT 0x0e 51 #define IREG_VCORE0 0x0f 52 #define IREG_VCORE1 0x10 53 #define IREG_VMEM0 0x11 54 #define IREG_VMEM1 0x12 55 #define IREG_PSU_TEMP 0x13 56 57 struct env { 58 void __iomem *regs; 59 spinlock_t lock; 60 61 struct device *hwmon_dev; 62 }; 63 64 static u8 env_read(struct env *p, u8 ireg) 65 { 66 u8 ret; 67 68 spin_lock(&p->lock); 69 writeb(ireg, p->regs + REG_ADDR); 70 ret = readb(p->regs + REG_DATA); 71 spin_unlock(&p->lock); 72 73 return ret; 74 } 75 76 static void env_write(struct env *p, u8 ireg, u8 val) 77 { 78 spin_lock(&p->lock); 79 writeb(ireg, p->regs + REG_ADDR); 80 writeb(val, p->regs + REG_DATA); 81 spin_unlock(&p->lock); 82 } 83 84 /* There seems to be a adr7462 providing these values, thus a lot 85 * of these calculations are borrowed from the adt7470 driver. 86 */ 87 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) 88 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM 89 #define FAN_PERIOD_INVALID (0xff << 8) 90 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) 91 92 static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf) 93 { 94 int fan_nr = to_sensor_dev_attr(attr)->index; 95 struct env *p = dev_get_drvdata(dev); 96 int rpm, period; 97 u8 val; 98 99 val = env_read(p, IREG_FAN0 + fan_nr); 100 period = (int) val << 8; 101 if (FAN_DATA_VALID(period)) 102 rpm = FAN_PERIOD_TO_RPM(period); 103 else 104 rpm = 0; 105 106 return sprintf(buf, "%d\n", rpm); 107 } 108 109 static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr, 110 const char *buf, size_t count) 111 { 112 int fan_nr = to_sensor_dev_attr(attr)->index; 113 int rpm = simple_strtol(buf, NULL, 10); 114 struct env *p = dev_get_drvdata(dev); 115 int period; 116 u8 val; 117 118 if (!rpm) 119 return -EINVAL; 120 121 period = FAN_RPM_TO_PERIOD(rpm); 122 val = period >> 8; 123 env_write(p, IREG_FAN0 + fan_nr, val); 124 125 return count; 126 } 127 128 static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, char *buf) 129 { 130 int fan_nr = to_sensor_dev_attr(attr)->index; 131 struct env *p = dev_get_drvdata(dev); 132 u8 val = env_read(p, IREG_FAN_STAT); 133 return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0); 134 } 135 136 #define fan(index) \ 137 static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \ 138 show_fan_speed, set_fan_speed, index); \ 139 static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \ 140 show_fan_fault, NULL, index) 141 142 fan(0); 143 fan(1); 144 fan(2); 145 fan(3); 146 fan(4); 147 148 static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6); 149 150 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) 151 { 152 int temp_nr = to_sensor_dev_attr(attr)->index; 153 struct env *p = dev_get_drvdata(dev); 154 s8 val; 155 156 val = env_read(p, IREG_LCL_TEMP + temp_nr); 157 return sprintf(buf, "%d\n", ((int) val) - 64); 158 } 159 160 static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0); 161 static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1); 162 static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2); 163 static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3); 164 static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4); 165 static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5); 166 static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6); 167 static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7); 168 static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13); 169 170 static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, char *buf) 171 { 172 int index = to_sensor_dev_attr(attr)->index; 173 struct env *p = dev_get_drvdata(dev); 174 u8 val; 175 176 val = readb(p->regs + REG_STAT); 177 return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0); 178 } 179 180 static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0); 181 static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1); 182 static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2); 183 static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 3); 184 185 static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, char *buf) 186 { 187 struct env *p = dev_get_drvdata(dev); 188 u8 val; 189 190 val = readb(p->regs + REG_STAT); 191 return sprintf(buf, "%d\n", val >> 4); 192 } 193 194 static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0); 195 196 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) 197 { 198 return sprintf(buf, "ultra45\n"); 199 } 200 201 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 202 203 static struct attribute *env_attributes[] = { 204 &sensor_dev_attr_fan0_speed.dev_attr.attr, 205 &sensor_dev_attr_fan0_fault.dev_attr.attr, 206 &sensor_dev_attr_fan1_speed.dev_attr.attr, 207 &sensor_dev_attr_fan1_fault.dev_attr.attr, 208 &sensor_dev_attr_fan2_speed.dev_attr.attr, 209 &sensor_dev_attr_fan2_fault.dev_attr.attr, 210 &sensor_dev_attr_fan3_speed.dev_attr.attr, 211 &sensor_dev_attr_fan3_fault.dev_attr.attr, 212 &sensor_dev_attr_fan4_speed.dev_attr.attr, 213 &sensor_dev_attr_fan4_fault.dev_attr.attr, 214 &sensor_dev_attr_psu_fan_fault.dev_attr.attr, 215 &sensor_dev_attr_adt7462_local_temp.dev_attr.attr, 216 &sensor_dev_attr_cpu0_temp.dev_attr.attr, 217 &sensor_dev_attr_cpu1_temp.dev_attr.attr, 218 &sensor_dev_attr_motherboard_temp.dev_attr.attr, 219 &sensor_dev_attr_lm95221_local_temp.dev_attr.attr, 220 &sensor_dev_attr_fire_temp.dev_attr.attr, 221 &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr, 222 &sensor_dev_attr_front_panel_temp.dev_attr.attr, 223 &sensor_dev_attr_psu_temp.dev_attr.attr, 224 &sensor_dev_attr_fan_failure.dev_attr.attr, 225 &sensor_dev_attr_env_bus_busy.dev_attr.attr, 226 &sensor_dev_attr_env_data_stale.dev_attr.attr, 227 &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr, 228 &sensor_dev_attr_firmware_version.dev_attr.attr, 229 &sensor_dev_attr_name.dev_attr.attr, 230 NULL, 231 }; 232 233 static const struct attribute_group env_group = { 234 .attrs = env_attributes, 235 }; 236 237 static int __devinit env_probe(struct of_device *op, 238 const struct of_device_id *match) 239 { 240 struct env *p = kzalloc(sizeof(*p), GFP_KERNEL); 241 int err = -ENOMEM; 242 243 if (!p) 244 goto out; 245 246 spin_lock_init(&p->lock); 247 248 p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747"); 249 if (!p->regs) 250 goto out_free; 251 252 err = sysfs_create_group(&op->dev.kobj, &env_group); 253 if (err) 254 goto out_iounmap; 255 256 p->hwmon_dev = hwmon_device_register(&op->dev); 257 if (IS_ERR(p->hwmon_dev)) { 258 err = PTR_ERR(p->hwmon_dev); 259 goto out_sysfs_remove_group; 260 } 261 262 dev_set_drvdata(&op->dev, p); 263 err = 0; 264 265 out: 266 return err; 267 268 out_sysfs_remove_group: 269 sysfs_remove_group(&op->dev.kobj, &env_group); 270 271 out_iounmap: 272 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 273 274 out_free: 275 kfree(p); 276 goto out; 277 } 278 279 static int __devexit env_remove(struct of_device *op) 280 { 281 struct env *p = dev_get_drvdata(&op->dev); 282 283 if (p) { 284 sysfs_remove_group(&op->dev.kobj, &env_group); 285 hwmon_device_unregister(p->hwmon_dev); 286 of_iounmap(&op->resource[0], p->regs, REG_SIZE); 287 kfree(p); 288 } 289 290 return 0; 291 } 292 293 static const struct of_device_id env_match[] = { 294 { 295 .name = "env-monitor", 296 .compatible = "SUNW,ebus-pic16f747-env", 297 }, 298 {}, 299 }; 300 MODULE_DEVICE_TABLE(of, env_match); 301 302 static struct of_platform_driver env_driver = { 303 .name = "ultra45_env", 304 .match_table = env_match, 305 .probe = env_probe, 306 .remove = __devexit_p(env_remove), 307 }; 308 309 static int __init env_init(void) 310 { 311 return of_register_driver(&env_driver, &of_bus_type); 312 } 313 314 static void __exit env_exit(void) 315 { 316 of_unregister_driver(&env_driver); 317 } 318 319 module_init(env_init); 320 module_exit(env_exit); 321