Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 1 | /* |
| 2 | * via-cputemp.c - Driver for VIA CPU core temperature monitoring |
| 3 | * Copyright (C) 2009 VIA Technologies, Inc. |
| 4 | * |
| 5 | * based on existing coretemp.c, which is |
| 6 | * |
| 7 | * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; version 2 of the License. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 21 | * 02110-1301 USA. |
| 22 | */ |
| 23 | |
Joe Perches | edb8d53 | 2010-10-20 06:51:50 +0000 | [diff] [blame] | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 25 | |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 26 | #include <linux/module.h> |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 27 | #include <linux/init.h> |
| 28 | #include <linux/slab.h> |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 29 | #include <linux/hwmon.h> |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 30 | #include <linux/hwmon-vid.h> |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 31 | #include <linux/sysfs.h> |
| 32 | #include <linux/hwmon-sysfs.h> |
| 33 | #include <linux/err.h> |
| 34 | #include <linux/mutex.h> |
| 35 | #include <linux/list.h> |
| 36 | #include <linux/platform_device.h> |
| 37 | #include <linux/cpu.h> |
| 38 | #include <asm/msr.h> |
| 39 | #include <asm/processor.h> |
Andi Kleen | 267fc97 | 2012-01-26 00:09:09 +0100 | [diff] [blame] | 40 | #include <asm/cpu_device_id.h> |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 41 | |
| 42 | #define DRVNAME "via_cputemp" |
| 43 | |
H. Peter Anvin | f279941 | 2010-08-14 21:09:02 +0200 | [diff] [blame] | 44 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * Functions declaration |
| 48 | */ |
| 49 | |
| 50 | struct via_cputemp_data { |
| 51 | struct device *hwmon_dev; |
| 52 | const char *name; |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 53 | u8 vrm; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 54 | u32 id; |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 55 | u32 msr_temp; |
| 56 | u32 msr_vid; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * Sysfs stuff |
| 61 | */ |
| 62 | |
| 63 | static ssize_t show_name(struct device *dev, struct device_attribute |
| 64 | *devattr, char *buf) |
| 65 | { |
| 66 | int ret; |
| 67 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 68 | struct via_cputemp_data *data = dev_get_drvdata(dev); |
| 69 | |
| 70 | if (attr->index == SHOW_NAME) |
| 71 | ret = sprintf(buf, "%s\n", data->name); |
| 72 | else /* show label */ |
| 73 | ret = sprintf(buf, "Core %d\n", data->id); |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | static ssize_t show_temp(struct device *dev, |
| 78 | struct device_attribute *devattr, char *buf) |
| 79 | { |
| 80 | struct via_cputemp_data *data = dev_get_drvdata(dev); |
| 81 | u32 eax, edx; |
| 82 | int err; |
| 83 | |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 84 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 85 | if (err) |
| 86 | return -EAGAIN; |
| 87 | |
| 88 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); |
| 89 | } |
| 90 | |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 91 | static ssize_t show_cpu_vid(struct device *dev, |
| 92 | struct device_attribute *devattr, char *buf) |
| 93 | { |
| 94 | struct via_cputemp_data *data = dev_get_drvdata(dev); |
| 95 | u32 eax, edx; |
| 96 | int err; |
| 97 | |
| 98 | err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx); |
| 99 | if (err) |
| 100 | return -EAGAIN; |
| 101 | |
| 102 | return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm)); |
| 103 | } |
| 104 | |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 105 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, |
| 106 | SHOW_TEMP); |
| 107 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); |
| 108 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); |
| 109 | |
| 110 | static struct attribute *via_cputemp_attributes[] = { |
| 111 | &sensor_dev_attr_name.dev_attr.attr, |
| 112 | &sensor_dev_attr_temp1_label.dev_attr.attr, |
| 113 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 114 | NULL |
| 115 | }; |
| 116 | |
| 117 | static const struct attribute_group via_cputemp_group = { |
| 118 | .attrs = via_cputemp_attributes, |
| 119 | }; |
| 120 | |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 121 | /* Optional attributes */ |
| 122 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL); |
| 123 | |
Bill Pemberton | 6c931ae | 2012-11-19 13:22:35 -0500 | [diff] [blame] | 124 | static int via_cputemp_probe(struct platform_device *pdev) |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 125 | { |
| 126 | struct via_cputemp_data *data; |
| 127 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); |
| 128 | int err; |
| 129 | u32 eax, edx; |
| 130 | |
Guenter Roeck | 505dc0c | 2012-06-02 13:12:58 -0700 | [diff] [blame] | 131 | data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data), |
| 132 | GFP_KERNEL); |
| 133 | if (!data) |
| 134 | return -ENOMEM; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 135 | |
| 136 | data->id = pdev->id; |
| 137 | data->name = "via_cputemp"; |
| 138 | |
| 139 | switch (c->x86_model) { |
| 140 | case 0xA: |
| 141 | /* C7 A */ |
| 142 | case 0xD: |
| 143 | /* C7 D */ |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 144 | data->msr_temp = 0x1169; |
| 145 | data->msr_vid = 0x198; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 146 | break; |
| 147 | case 0xF: |
| 148 | /* Nano */ |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 149 | data->msr_temp = 0x1423; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 150 | break; |
| 151 | default: |
Guenter Roeck | 505dc0c | 2012-06-02 13:12:58 -0700 | [diff] [blame] | 152 | return -ENODEV; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | /* test if we can access the TEMPERATURE MSR */ |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 156 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 157 | if (err) { |
| 158 | dev_err(&pdev->dev, |
| 159 | "Unable to access TEMPERATURE MSR, giving up\n"); |
Guenter Roeck | 505dc0c | 2012-06-02 13:12:58 -0700 | [diff] [blame] | 160 | return err; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | platform_set_drvdata(pdev, data); |
| 164 | |
| 165 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); |
| 166 | if (err) |
Guenter Roeck | 505dc0c | 2012-06-02 13:12:58 -0700 | [diff] [blame] | 167 | return err; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 168 | |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 169 | if (data->msr_vid) |
| 170 | data->vrm = vid_which_vrm(); |
| 171 | |
| 172 | if (data->vrm) { |
| 173 | err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); |
| 174 | if (err) |
| 175 | goto exit_remove; |
| 176 | } |
| 177 | |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 178 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
| 179 | if (IS_ERR(data->hwmon_dev)) { |
| 180 | err = PTR_ERR(data->hwmon_dev); |
| 181 | dev_err(&pdev->dev, "Class registration failed (%d)\n", |
| 182 | err); |
| 183 | goto exit_remove; |
| 184 | } |
| 185 | |
| 186 | return 0; |
| 187 | |
| 188 | exit_remove: |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 189 | if (data->vrm) |
| 190 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 191 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 192 | return err; |
| 193 | } |
| 194 | |
Bill Pemberton | 281dfd0 | 2012-11-19 13:25:51 -0500 | [diff] [blame] | 195 | static int via_cputemp_remove(struct platform_device *pdev) |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 196 | { |
| 197 | struct via_cputemp_data *data = platform_get_drvdata(pdev); |
| 198 | |
| 199 | hwmon_device_unregister(data->hwmon_dev); |
Jean Delvare | 764e043 | 2011-07-25 21:46:10 +0200 | [diff] [blame] | 200 | if (data->vrm) |
| 201 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 202 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static struct platform_driver via_cputemp_driver = { |
| 207 | .driver = { |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 208 | .name = DRVNAME, |
| 209 | }, |
| 210 | .probe = via_cputemp_probe, |
Bill Pemberton | 9e5e9b7 | 2012-11-19 13:21:20 -0500 | [diff] [blame] | 211 | .remove = via_cputemp_remove, |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 212 | }; |
| 213 | |
| 214 | struct pdev_entry { |
| 215 | struct list_head list; |
| 216 | struct platform_device *pdev; |
| 217 | unsigned int cpu; |
| 218 | }; |
| 219 | |
| 220 | static LIST_HEAD(pdev_list); |
| 221 | static DEFINE_MUTEX(pdev_list_mutex); |
| 222 | |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 223 | static int via_cputemp_online(unsigned int cpu) |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 224 | { |
| 225 | int err; |
| 226 | struct platform_device *pdev; |
| 227 | struct pdev_entry *pdev_entry; |
| 228 | |
| 229 | pdev = platform_device_alloc(DRVNAME, cpu); |
| 230 | if (!pdev) { |
| 231 | err = -ENOMEM; |
Joe Perches | edb8d53 | 2010-10-20 06:51:50 +0000 | [diff] [blame] | 232 | pr_err("Device allocation failed\n"); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 233 | goto exit; |
| 234 | } |
| 235 | |
| 236 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); |
| 237 | if (!pdev_entry) { |
| 238 | err = -ENOMEM; |
| 239 | goto exit_device_put; |
| 240 | } |
| 241 | |
| 242 | err = platform_device_add(pdev); |
| 243 | if (err) { |
Joe Perches | edb8d53 | 2010-10-20 06:51:50 +0000 | [diff] [blame] | 244 | pr_err("Device addition failed (%d)\n", err); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 245 | goto exit_device_free; |
| 246 | } |
| 247 | |
| 248 | pdev_entry->pdev = pdev; |
| 249 | pdev_entry->cpu = cpu; |
| 250 | mutex_lock(&pdev_list_mutex); |
| 251 | list_add_tail(&pdev_entry->list, &pdev_list); |
| 252 | mutex_unlock(&pdev_list_mutex); |
| 253 | |
| 254 | return 0; |
| 255 | |
| 256 | exit_device_free: |
| 257 | kfree(pdev_entry); |
| 258 | exit_device_put: |
| 259 | platform_device_put(pdev); |
| 260 | exit: |
| 261 | return err; |
| 262 | } |
| 263 | |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 264 | static int via_cputemp_down_prep(unsigned int cpu) |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 265 | { |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 266 | struct pdev_entry *p; |
| 267 | |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 268 | mutex_lock(&pdev_list_mutex); |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 269 | list_for_each_entry(p, &pdev_list, list) { |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 270 | if (p->cpu == cpu) { |
| 271 | platform_device_unregister(p->pdev); |
| 272 | list_del(&p->list); |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 273 | mutex_unlock(&pdev_list_mutex); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 274 | kfree(p); |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 275 | return 0; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 276 | } |
| 277 | } |
| 278 | mutex_unlock(&pdev_list_mutex); |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 279 | return 0; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 280 | } |
| 281 | |
Jan Beulich | e273bd9 | 2012-07-30 11:33:00 +0200 | [diff] [blame] | 282 | static const struct x86_cpu_id __initconst cputemp_ids[] = { |
Andi Kleen | 267fc97 | 2012-01-26 00:09:09 +0100 | [diff] [blame] | 283 | { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */ |
| 284 | { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */ |
| 285 | { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */ |
| 286 | {} |
| 287 | }; |
| 288 | MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); |
| 289 | |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 290 | static enum cpuhp_state via_temp_online; |
| 291 | |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 292 | static int __init via_cputemp_init(void) |
| 293 | { |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 294 | int err; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 295 | |
Andi Kleen | 267fc97 | 2012-01-26 00:09:09 +0100 | [diff] [blame] | 296 | if (!x86_match_cpu(cputemp_ids)) |
| 297 | return -ENODEV; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 298 | |
| 299 | err = platform_driver_register(&via_cputemp_driver); |
| 300 | if (err) |
| 301 | goto exit; |
| 302 | |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 303 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online", |
| 304 | via_cputemp_online, via_cputemp_down_prep); |
| 305 | if (err < 0) |
| 306 | goto exit_driver_unreg; |
| 307 | via_temp_online = err; |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 308 | |
| 309 | #ifndef CONFIG_HOTPLUG_CPU |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 310 | if (list_empty(&pdev_list)) { |
| 311 | err = -ENODEV; |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 312 | goto exit_hp_unreg; |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 313 | } |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 314 | #endif |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 315 | return 0; |
| 316 | |
Jan Beulich | ae9e0ce | 2010-12-06 11:48:35 -0500 | [diff] [blame] | 317 | #ifndef CONFIG_HOTPLUG_CPU |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 318 | exit_hp_unreg: |
| 319 | cpuhp_remove_state_nocalls(via_temp_online); |
| 320 | #endif |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 321 | exit_driver_unreg: |
| 322 | platform_driver_unregister(&via_cputemp_driver); |
| 323 | exit: |
| 324 | return err; |
| 325 | } |
| 326 | |
| 327 | static void __exit via_cputemp_exit(void) |
| 328 | { |
Sebastian Andrzej Siewior | df60d70 | 2016-11-18 16:09:50 +0100 | [diff] [blame] | 329 | cpuhp_remove_state(via_temp_online); |
Harald Welte | 70c3877 | 2009-12-16 21:38:28 +0100 | [diff] [blame] | 330 | platform_driver_unregister(&via_cputemp_driver); |
| 331 | } |
| 332 | |
| 333 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); |
| 334 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); |
| 335 | MODULE_LICENSE("GPL"); |
| 336 | |
| 337 | module_init(via_cputemp_init) |
| 338 | module_exit(via_cputemp_exit) |