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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a80b10cc GR |
2 | /* |
3 | * ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor. | |
e0418088 DM |
4 | * |
5 | * Copyright (C) 2008 David S. Miller <davem@davemloft.net> | |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/slab.h> | |
31a1a152 | 11 | #include <linux/module.h> |
e0418088 DM |
12 | #include <linux/of_device.h> |
13 | #include <linux/io.h> | |
14 | #include <linux/hwmon.h> | |
15 | #include <linux/hwmon-sysfs.h> | |
fa845740 | 16 | #include <linux/err.h> |
e0418088 DM |
17 | |
18 | #define DRV_MODULE_VERSION "0.1" | |
19 | ||
20 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
21 | MODULE_DESCRIPTION("Ultra45 environmental monitor driver"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | MODULE_VERSION(DRV_MODULE_VERSION); | |
24 | ||
25 | /* PIC device registers */ | |
26 | #define REG_CMD 0x00UL | |
27 | #define REG_CMD_RESET 0x80 | |
28 | #define REG_CMD_ESTAR 0x01 | |
29 | #define REG_STAT 0x01UL | |
30 | #define REG_STAT_FWVER 0xf0 | |
31 | #define REG_STAT_TGOOD 0x08 | |
32 | #define REG_STAT_STALE 0x04 | |
33 | #define REG_STAT_BUSY 0x02 | |
34 | #define REG_STAT_FAULT 0x01 | |
35 | #define REG_DATA 0x40UL | |
36 | #define REG_ADDR 0x41UL | |
37 | #define REG_SIZE 0x42UL | |
38 | ||
39 | /* Registers accessed indirectly via REG_DATA/REG_ADDR */ | |
40 | #define IREG_FAN0 0x00 | |
41 | #define IREG_FAN1 0x01 | |
42 | #define IREG_FAN2 0x02 | |
43 | #define IREG_FAN3 0x03 | |
44 | #define IREG_FAN4 0x04 | |
45 | #define IREG_FAN5 0x05 | |
46 | #define IREG_LCL_TEMP 0x06 | |
47 | #define IREG_RMT1_TEMP 0x07 | |
48 | #define IREG_RMT2_TEMP 0x08 | |
49 | #define IREG_RMT3_TEMP 0x09 | |
50 | #define IREG_LM95221_TEMP 0x0a | |
51 | #define IREG_FIRE_TEMP 0x0b | |
52 | #define IREG_LSI1064_TEMP 0x0c | |
53 | #define IREG_FRONT_TEMP 0x0d | |
54 | #define IREG_FAN_STAT 0x0e | |
55 | #define IREG_VCORE0 0x0f | |
56 | #define IREG_VCORE1 0x10 | |
57 | #define IREG_VMEM0 0x11 | |
58 | #define IREG_VMEM1 0x12 | |
59 | #define IREG_PSU_TEMP 0x13 | |
60 | ||
61 | struct env { | |
62 | void __iomem *regs; | |
63 | spinlock_t lock; | |
64 | ||
65 | struct device *hwmon_dev; | |
66 | }; | |
67 | ||
68 | static u8 env_read(struct env *p, u8 ireg) | |
69 | { | |
70 | u8 ret; | |
71 | ||
72 | spin_lock(&p->lock); | |
73 | writeb(ireg, p->regs + REG_ADDR); | |
74 | ret = readb(p->regs + REG_DATA); | |
75 | spin_unlock(&p->lock); | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
80 | static void env_write(struct env *p, u8 ireg, u8 val) | |
81 | { | |
82 | spin_lock(&p->lock); | |
83 | writeb(ireg, p->regs + REG_ADDR); | |
84 | writeb(val, p->regs + REG_DATA); | |
85 | spin_unlock(&p->lock); | |
86 | } | |
87 | ||
a80b10cc GR |
88 | /* |
89 | * There seems to be a adr7462 providing these values, thus a lot | |
e0418088 DM |
90 | * of these calculations are borrowed from the adt7470 driver. |
91 | */ | |
92 | #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x)) | |
93 | #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM | |
94 | #define FAN_PERIOD_INVALID (0xff << 8) | |
95 | #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID) | |
96 | ||
a80b10cc GR |
97 | static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, |
98 | char *buf) | |
e0418088 DM |
99 | { |
100 | int fan_nr = to_sensor_dev_attr(attr)->index; | |
101 | struct env *p = dev_get_drvdata(dev); | |
102 | int rpm, period; | |
103 | u8 val; | |
104 | ||
105 | val = env_read(p, IREG_FAN0 + fan_nr); | |
106 | period = (int) val << 8; | |
107 | if (FAN_DATA_VALID(period)) | |
108 | rpm = FAN_PERIOD_TO_RPM(period); | |
109 | else | |
110 | rpm = 0; | |
111 | ||
112 | return sprintf(buf, "%d\n", rpm); | |
113 | } | |
114 | ||
115 | static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr, | |
116 | const char *buf, size_t count) | |
117 | { | |
118 | int fan_nr = to_sensor_dev_attr(attr)->index; | |
a80b10cc | 119 | unsigned long rpm; |
e0418088 DM |
120 | struct env *p = dev_get_drvdata(dev); |
121 | int period; | |
122 | u8 val; | |
a80b10cc GR |
123 | int err; |
124 | ||
125 | err = kstrtoul(buf, 10, &rpm); | |
126 | if (err) | |
127 | return err; | |
e0418088 DM |
128 | |
129 | if (!rpm) | |
130 | return -EINVAL; | |
131 | ||
132 | period = FAN_RPM_TO_PERIOD(rpm); | |
133 | val = period >> 8; | |
134 | env_write(p, IREG_FAN0 + fan_nr, val); | |
135 | ||
136 | return count; | |
137 | } | |
138 | ||
a80b10cc GR |
139 | static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, |
140 | char *buf) | |
e0418088 DM |
141 | { |
142 | int fan_nr = to_sensor_dev_attr(attr)->index; | |
143 | struct env *p = dev_get_drvdata(dev); | |
144 | u8 val = env_read(p, IREG_FAN_STAT); | |
145 | return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0); | |
146 | } | |
147 | ||
148 | #define fan(index) \ | |
149 | static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \ | |
150 | show_fan_speed, set_fan_speed, index); \ | |
151 | static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \ | |
152 | show_fan_fault, NULL, index) | |
153 | ||
154 | fan(0); | |
155 | fan(1); | |
156 | fan(2); | |
157 | fan(3); | |
158 | fan(4); | |
159 | ||
160 | static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6); | |
161 | ||
a80b10cc GR |
162 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, |
163 | char *buf) | |
e0418088 DM |
164 | { |
165 | int temp_nr = to_sensor_dev_attr(attr)->index; | |
166 | struct env *p = dev_get_drvdata(dev); | |
167 | s8 val; | |
168 | ||
169 | val = env_read(p, IREG_LCL_TEMP + temp_nr); | |
170 | return sprintf(buf, "%d\n", ((int) val) - 64); | |
171 | } | |
172 | ||
173 | static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0); | |
174 | static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1); | |
175 | static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2); | |
176 | static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3); | |
177 | static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4); | |
178 | static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5); | |
179 | static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6); | |
180 | static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7); | |
181 | static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13); | |
182 | ||
a80b10cc GR |
183 | static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, |
184 | char *buf) | |
e0418088 DM |
185 | { |
186 | int index = to_sensor_dev_attr(attr)->index; | |
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 & (1 << index)) ? 1 : 0); | |
192 | } | |
193 | ||
194 | static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0); | |
195 | static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1); | |
196 | static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2); | |
a80b10cc GR |
197 | static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, |
198 | 3); | |
e0418088 | 199 | |
a80b10cc GR |
200 | static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, |
201 | char *buf) | |
e0418088 DM |
202 | { |
203 | struct env *p = dev_get_drvdata(dev); | |
204 | u8 val; | |
205 | ||
206 | val = readb(p->regs + REG_STAT); | |
207 | return sprintf(buf, "%d\n", val >> 4); | |
208 | } | |
209 | ||
210 | static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0); | |
211 | ||
a80b10cc GR |
212 | static ssize_t show_name(struct device *dev, struct device_attribute *attr, |
213 | char *buf) | |
e0418088 DM |
214 | { |
215 | return sprintf(buf, "ultra45\n"); | |
216 | } | |
217 | ||
218 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); | |
219 | ||
220 | static struct attribute *env_attributes[] = { | |
221 | &sensor_dev_attr_fan0_speed.dev_attr.attr, | |
222 | &sensor_dev_attr_fan0_fault.dev_attr.attr, | |
223 | &sensor_dev_attr_fan1_speed.dev_attr.attr, | |
224 | &sensor_dev_attr_fan1_fault.dev_attr.attr, | |
225 | &sensor_dev_attr_fan2_speed.dev_attr.attr, | |
226 | &sensor_dev_attr_fan2_fault.dev_attr.attr, | |
227 | &sensor_dev_attr_fan3_speed.dev_attr.attr, | |
228 | &sensor_dev_attr_fan3_fault.dev_attr.attr, | |
229 | &sensor_dev_attr_fan4_speed.dev_attr.attr, | |
230 | &sensor_dev_attr_fan4_fault.dev_attr.attr, | |
231 | &sensor_dev_attr_psu_fan_fault.dev_attr.attr, | |
232 | &sensor_dev_attr_adt7462_local_temp.dev_attr.attr, | |
233 | &sensor_dev_attr_cpu0_temp.dev_attr.attr, | |
234 | &sensor_dev_attr_cpu1_temp.dev_attr.attr, | |
235 | &sensor_dev_attr_motherboard_temp.dev_attr.attr, | |
236 | &sensor_dev_attr_lm95221_local_temp.dev_attr.attr, | |
237 | &sensor_dev_attr_fire_temp.dev_attr.attr, | |
238 | &sensor_dev_attr_lsi1064_local_temp.dev_attr.attr, | |
239 | &sensor_dev_attr_front_panel_temp.dev_attr.attr, | |
240 | &sensor_dev_attr_psu_temp.dev_attr.attr, | |
241 | &sensor_dev_attr_fan_failure.dev_attr.attr, | |
242 | &sensor_dev_attr_env_bus_busy.dev_attr.attr, | |
243 | &sensor_dev_attr_env_data_stale.dev_attr.attr, | |
244 | &sensor_dev_attr_tpm_self_test_passed.dev_attr.attr, | |
245 | &sensor_dev_attr_firmware_version.dev_attr.attr, | |
246 | &sensor_dev_attr_name.dev_attr.attr, | |
247 | NULL, | |
248 | }; | |
249 | ||
250 | static const struct attribute_group env_group = { | |
251 | .attrs = env_attributes, | |
252 | }; | |
253 | ||
6c931ae1 | 254 | static int env_probe(struct platform_device *op) |
e0418088 | 255 | { |
e8cba3cd | 256 | struct env *p = devm_kzalloc(&op->dev, sizeof(*p), GFP_KERNEL); |
e0418088 DM |
257 | int err = -ENOMEM; |
258 | ||
259 | if (!p) | |
260 | goto out; | |
261 | ||
262 | spin_lock_init(&p->lock); | |
263 | ||
264 | p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747"); | |
265 | if (!p->regs) | |
e8cba3cd | 266 | goto out; |
e0418088 DM |
267 | |
268 | err = sysfs_create_group(&op->dev.kobj, &env_group); | |
269 | if (err) | |
270 | goto out_iounmap; | |
271 | ||
272 | p->hwmon_dev = hwmon_device_register(&op->dev); | |
273 | if (IS_ERR(p->hwmon_dev)) { | |
274 | err = PTR_ERR(p->hwmon_dev); | |
275 | goto out_sysfs_remove_group; | |
276 | } | |
277 | ||
95de3b25 | 278 | platform_set_drvdata(op, p); |
e0418088 DM |
279 | err = 0; |
280 | ||
281 | out: | |
282 | return err; | |
283 | ||
284 | out_sysfs_remove_group: | |
285 | sysfs_remove_group(&op->dev.kobj, &env_group); | |
286 | ||
287 | out_iounmap: | |
288 | of_iounmap(&op->resource[0], p->regs, REG_SIZE); | |
289 | ||
e0418088 DM |
290 | goto out; |
291 | } | |
292 | ||
281dfd0b | 293 | static int env_remove(struct platform_device *op) |
e0418088 | 294 | { |
95de3b25 | 295 | struct env *p = platform_get_drvdata(op); |
e0418088 DM |
296 | |
297 | if (p) { | |
298 | sysfs_remove_group(&op->dev.kobj, &env_group); | |
299 | hwmon_device_unregister(p->hwmon_dev); | |
300 | of_iounmap(&op->resource[0], p->regs, REG_SIZE); | |
e0418088 DM |
301 | } |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
fd098316 | 306 | static const struct of_device_id env_match[] = { |
e0418088 DM |
307 | { |
308 | .name = "env-monitor", | |
309 | .compatible = "SUNW,ebus-pic16f747-env", | |
310 | }, | |
311 | {}, | |
312 | }; | |
313 | MODULE_DEVICE_TABLE(of, env_match); | |
314 | ||
4ebb24f7 | 315 | static struct platform_driver env_driver = { |
4018294b GL |
316 | .driver = { |
317 | .name = "ultra45_env", | |
4018294b GL |
318 | .of_match_table = env_match, |
319 | }, | |
e0418088 | 320 | .probe = env_probe, |
9e5e9b7a | 321 | .remove = env_remove, |
e0418088 DM |
322 | }; |
323 | ||
25a236a5 | 324 | module_platform_driver(env_driver); |