1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /***************************************************************************
3 * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
5 ***************************************************************************/
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/bits.h>
10 #include <linux/minmax.h>
11 #include <linux/module.h>
12 #include <linux/mod_devicetable.h>
14 #include <linux/init.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17 #include <linux/jiffies.h>
18 #include <linux/platform_device.h>
19 #include <linux/hwmon.h>
20 #include <linux/err.h>
21 #include <linux/mutex.h>
22 #include "sch56xx-common.h"
24 #define DRVNAME "sch5627"
25 #define DEVNAME DRVNAME /* We only support one model */
27 #define SCH5627_HWMON_ID 0xa5
28 #define SCH5627_COMPANY_ID 0x5c
29 #define SCH5627_PRIMARY_ID 0xa0
31 #define SCH5627_REG_BUILD_CODE 0x39
32 #define SCH5627_REG_BUILD_ID 0x3a
33 #define SCH5627_REG_HWMON_ID 0x3c
34 #define SCH5627_REG_HWMON_REV 0x3d
35 #define SCH5627_REG_COMPANY_ID 0x3e
36 #define SCH5627_REG_PRIMARY_ID 0x3f
37 #define SCH5627_REG_CTRL 0x40
39 #define SCH5627_CTRL_START BIT(0)
40 #define SCH5627_CTRL_LOCK BIT(1)
41 #define SCH5627_CTRL_VBAT BIT(4)
43 #define SCH5627_NO_TEMPS 8
44 #define SCH5627_NO_FANS 4
45 #define SCH5627_NO_IN 5
47 static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
48 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
49 static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
50 0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
51 static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
52 0, 0, 1, 1, 0, 0, 0, 1 };
53 static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
54 0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
55 static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
56 0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
58 static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
59 0x2C, 0x2E, 0x30, 0x32 };
60 static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
61 0x62, 0x64, 0x66, 0x68 };
63 static const u16 SCH5627_REG_PWM_MAP[SCH5627_NO_FANS] = {
64 0xA0, 0xA1, 0xA2, 0xA3 };
66 static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
67 0x22, 0x23, 0x24, 0x25, 0x189 };
68 static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
69 0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
70 static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
72 static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
73 10745, 3660, 9765, 10745, 3660 };
74 static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
75 "VCC", "VTT", "VBAT", "VTR", "V_IN" };
78 struct regmap *regmap;
82 struct mutex update_lock;
83 unsigned long last_battery; /* In jiffies */
84 char temp_valid; /* !=0 if following fields are valid */
87 unsigned long temp_last_updated; /* In jiffies */
88 unsigned long fan_last_updated;
89 unsigned long in_last_updated;
90 u16 temp[SCH5627_NO_TEMPS];
91 u16 fan[SCH5627_NO_FANS];
92 u16 in[SCH5627_NO_IN];
95 static const struct regmap_range sch5627_tunables_ranges[] = {
96 regmap_reg_range(0x57, 0x57),
97 regmap_reg_range(0x59, 0x59),
98 regmap_reg_range(0x5B, 0x5B),
99 regmap_reg_range(0x5D, 0x5D),
100 regmap_reg_range(0x5F, 0x5F),
101 regmap_reg_range(0x61, 0x69),
102 regmap_reg_range(0x96, 0x9B),
103 regmap_reg_range(0xA0, 0xA3),
104 regmap_reg_range(0x184, 0x184),
105 regmap_reg_range(0x186, 0x186),
106 regmap_reg_range(0x1A8, 0x1A9),
109 static const struct regmap_access_table sch5627_tunables_table = {
110 .yes_ranges = sch5627_tunables_ranges,
111 .n_yes_ranges = ARRAY_SIZE(sch5627_tunables_ranges),
114 static const struct regmap_config sch5627_regmap_config = {
117 .wr_table = &sch5627_tunables_table,
118 .rd_table = &sch5627_tunables_table,
119 .cache_type = REGCACHE_RBTREE,
120 .use_single_read = true,
121 .use_single_write = true,
125 static int sch5627_update_temp(struct sch5627_data *data)
130 mutex_lock(&data->update_lock);
132 /* Cache the values for 1 second */
133 if (time_after(jiffies, data->temp_last_updated + HZ) || !data->temp_valid) {
134 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
135 val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_TEMP_MSB[i],
136 SCH5627_REG_TEMP_LSN[i],
137 SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
138 if (unlikely(val < 0)) {
144 data->temp_last_updated = jiffies;
145 data->temp_valid = 1;
148 mutex_unlock(&data->update_lock);
152 static int sch5627_update_fan(struct sch5627_data *data)
157 mutex_lock(&data->update_lock);
159 /* Cache the values for 1 second */
160 if (time_after(jiffies, data->fan_last_updated + HZ) || !data->fan_valid) {
161 for (i = 0; i < SCH5627_NO_FANS; i++) {
162 val = sch56xx_read_virtual_reg16(data->addr, SCH5627_REG_FAN[i]);
163 if (unlikely(val < 0)) {
169 data->fan_last_updated = jiffies;
173 mutex_unlock(&data->update_lock);
177 static int sch5627_update_in(struct sch5627_data *data)
182 mutex_lock(&data->update_lock);
184 /* Trigger a Vbat voltage measurement every 5 minutes */
185 if (time_after(jiffies, data->last_battery + 300 * HZ)) {
186 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
187 data->control | SCH5627_CTRL_VBAT);
188 data->last_battery = jiffies;
191 /* Cache the values for 1 second */
192 if (time_after(jiffies, data->in_last_updated + HZ) || !data->in_valid) {
193 for (i = 0; i < SCH5627_NO_IN; i++) {
194 val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_IN_MSB[i],
195 SCH5627_REG_IN_LSN[i],
196 SCH5627_REG_IN_HIGH_NIBBLE[i]);
197 if (unlikely(val < 0)) {
203 data->in_last_updated = jiffies;
207 mutex_unlock(&data->update_lock);
211 static int reg_to_temp(u16 reg)
213 return (reg * 625) / 10 - 64000;
216 static int reg_to_temp_limit(u8 reg)
218 return (reg - 64) * 1000;
221 static int reg_to_rpm(u16 reg)
228 return 5400540 / reg;
231 static u8 sch5627_temp_limit_to_reg(long value)
233 long limit = (value / 1000) + 64;
235 return clamp_val(limit, 0, U8_MAX);
238 static u16 sch5627_rpm_to_reg(long value)
245 pulses = 5400540 / value;
247 return clamp_val(pulses, 1, U16_MAX - 1);
250 static umode_t sch5627_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
253 const struct sch5627_data *data = drvdata;
255 /* Once the lock bit is set, the virtual registers become read-only
256 * until the next power cycle.
258 if (data->control & SCH5627_CTRL_LOCK)
265 case hwmon_temp_crit:
281 case hwmon_pwm_auto_channels_temp:
294 static int sch5627_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
297 struct sch5627_data *data = dev_get_drvdata(dev);
303 case hwmon_temp_input:
304 ret = sch5627_update_temp(data);
308 *val = reg_to_temp(data->temp[channel]);
311 ret = regmap_read(data->regmap, SCH5627_REG_TEMP_ABS[channel], &value);
315 *val = reg_to_temp_limit((u8)value);
317 case hwmon_temp_crit:
318 ret = regmap_read(data->regmap, SCH5627_REG_TEMP_HIGH[channel], &value);
322 *val = reg_to_temp_limit((u8)value);
324 case hwmon_temp_fault:
325 ret = sch5627_update_temp(data);
329 *val = (data->temp[channel] == 0);
337 case hwmon_fan_input:
338 ret = sch5627_update_fan(data);
342 ret = reg_to_rpm(data->fan[channel]);
349 ret = sch56xx_regmap_read16(data->regmap, SCH5627_REG_FAN_MIN[channel],
354 ret = reg_to_rpm((u16)value);
360 case hwmon_fan_fault:
361 ret = sch5627_update_fan(data);
365 *val = (data->fan[channel] == 0xffff);
373 case hwmon_pwm_auto_channels_temp:
374 ret = regmap_read(data->regmap, SCH5627_REG_PWM_MAP[channel], &value);
385 ret = sch5627_update_in(data);
390 *val = DIV_ROUND_CLOSEST(data->in[channel] * SCH5627_REG_IN_FACTOR[channel],
404 static int sch5627_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
405 int channel, const char **str)
411 *str = SCH5627_IN_LABELS[channel];
424 static int sch5627_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
427 struct sch5627_data *data = dev_get_drvdata(dev);
433 temp = sch5627_temp_limit_to_reg(val);
437 return regmap_write(data->regmap, SCH5627_REG_TEMP_ABS[channel], temp);
438 case hwmon_temp_crit:
439 return regmap_write(data->regmap, SCH5627_REG_TEMP_HIGH[channel], temp);
447 fan = sch5627_rpm_to_reg(val);
449 return sch56xx_regmap_write16(data->regmap, SCH5627_REG_FAN_MIN[channel],
457 case hwmon_pwm_auto_channels_temp:
458 /* registers are 8 bit wide */
459 if (val > U8_MAX || val < 0)
462 return regmap_write(data->regmap, SCH5627_REG_PWM_MAP[channel], val);
474 static const struct hwmon_ops sch5627_ops = {
475 .is_visible = sch5627_is_visible,
476 .read = sch5627_read,
477 .read_string = sch5627_read_string,
478 .write = sch5627_write,
481 static const struct hwmon_channel_info * const sch5627_info[] = {
482 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
483 HWMON_CHANNEL_INFO(temp,
484 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
485 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
486 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
487 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
488 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
489 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
490 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
491 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT
493 HWMON_CHANNEL_INFO(fan,
494 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
495 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
496 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
497 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT
499 HWMON_CHANNEL_INFO(pwm,
500 HWMON_PWM_AUTO_CHANNELS_TEMP,
501 HWMON_PWM_AUTO_CHANNELS_TEMP,
502 HWMON_PWM_AUTO_CHANNELS_TEMP,
503 HWMON_PWM_AUTO_CHANNELS_TEMP
505 HWMON_CHANNEL_INFO(in,
506 HWMON_I_INPUT | HWMON_I_LABEL,
507 HWMON_I_INPUT | HWMON_I_LABEL,
508 HWMON_I_INPUT | HWMON_I_LABEL,
509 HWMON_I_INPUT | HWMON_I_LABEL,
515 static const struct hwmon_chip_info sch5627_chip_info = {
517 .info = sch5627_info,
520 static int sch5627_probe(struct platform_device *pdev)
522 struct sch5627_data *data;
523 struct device *hwmon_dev;
524 int build_code, build_id, hwmon_rev, val;
526 data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
531 data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
532 mutex_init(&data->update_lock);
533 platform_set_drvdata(pdev, data);
535 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
539 if (val != SCH5627_HWMON_ID) {
540 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
541 val, SCH5627_HWMON_ID);
545 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
549 if (val != SCH5627_COMPANY_ID) {
550 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
551 val, SCH5627_COMPANY_ID);
555 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
559 if (val != SCH5627_PRIMARY_ID) {
560 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
561 val, SCH5627_PRIMARY_ID);
565 build_code = sch56xx_read_virtual_reg(data->addr,
566 SCH5627_REG_BUILD_CODE);
570 build_id = sch56xx_read_virtual_reg16(data->addr,
571 SCH5627_REG_BUILD_ID);
575 hwmon_rev = sch56xx_read_virtual_reg(data->addr,
576 SCH5627_REG_HWMON_REV);
580 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
585 if (!(data->control & SCH5627_CTRL_START)) {
586 pr_err("hardware monitoring not enabled\n");
590 data->regmap = devm_regmap_init_sch56xx(&pdev->dev, &data->update_lock, data->addr,
591 &sch5627_regmap_config);
592 if (IS_ERR(data->regmap))
593 return PTR_ERR(data->regmap);
595 /* Trigger a Vbat voltage measurement, so that we get a valid reading
596 the first time we read Vbat */
597 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL, data->control | SCH5627_CTRL_VBAT);
598 data->last_battery = jiffies;
600 pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
601 pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
602 build_code, build_id, hwmon_rev);
604 hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, DEVNAME, data,
605 &sch5627_chip_info, NULL);
606 if (IS_ERR(hwmon_dev))
607 return PTR_ERR(hwmon_dev);
609 /* Note failing to register the watchdog is not a fatal error */
610 sch56xx_watchdog_register(&pdev->dev, data->addr,
611 (build_code << 24) | (build_id << 8) | hwmon_rev,
612 &data->update_lock, 1);
617 static int sch5627_suspend(struct device *dev)
619 struct sch5627_data *data = dev_get_drvdata(dev);
621 regcache_cache_only(data->regmap, true);
622 regcache_mark_dirty(data->regmap);
627 static int sch5627_resume(struct device *dev)
629 struct sch5627_data *data = dev_get_drvdata(dev);
631 regcache_cache_only(data->regmap, false);
632 /* We must not access the virtual registers when the lock bit is set */
633 if (data->control & SCH5627_CTRL_LOCK)
634 return regcache_drop_region(data->regmap, 0, U16_MAX);
636 return regcache_sync(data->regmap);
639 static DEFINE_SIMPLE_DEV_PM_OPS(sch5627_dev_pm_ops, sch5627_suspend, sch5627_resume);
641 static const struct platform_device_id sch5627_device_id[] = {
647 MODULE_DEVICE_TABLE(platform, sch5627_device_id);
649 static struct platform_driver sch5627_driver = {
652 .pm = pm_sleep_ptr(&sch5627_dev_pm_ops),
654 .probe = sch5627_probe,
655 .id_table = sch5627_device_id,
658 module_platform_driver(sch5627_driver);
660 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
661 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
662 MODULE_LICENSE("GPL");