2 * nct7904.c - driver for Nuvoton NCT7904D.
4 * Copyright (c) 2015 Kontron
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/mutex.h>
23 #include <linux/hwmon.h>
25 #define VENDOR_ID_REG 0x7A /* Any bank */
26 #define NUVOTON_ID 0x50
27 #define CHIP_ID_REG 0x7B /* Any bank */
28 #define NCT7904_ID 0xC5
29 #define DEVICE_ID_REG 0x7C /* Any bank */
31 #define BANK_SEL_REG 0xFF
39 #define FANIN_MAX 12 /* Counted from 1 */
40 #define VSEN_MAX 21 /* VSEN1..14, 3VDD, VBAT, V3VSB,
41 LTD (not a voltage), VSEN17..19 */
42 #define FANCTL_MAX 4 /* Counted from 1 */
43 #define TCPU_MAX 8 /* Counted from 1 */
44 #define TEMP_MAX 4 /* Counted from 1 */
46 #define VT_ADC_CTRL0_REG 0x20 /* Bank 0 */
47 #define VT_ADC_CTRL1_REG 0x21 /* Bank 0 */
48 #define VT_ADC_CTRL2_REG 0x22 /* Bank 0 */
49 #define FANIN_CTRL0_REG 0x24
50 #define FANIN_CTRL1_REG 0x25
51 #define DTS_T_CTRL0_REG 0x26
52 #define DTS_T_CTRL1_REG 0x27
53 #define VT_ADC_MD_REG 0x2E
55 #define VSEN1_HV_REG 0x40 /* Bank 0; 2 regs (HV/LV) per sensor */
56 #define TEMP_CH1_HV_REG 0x42 /* Bank 0; same as VSEN2_HV */
57 #define LTD_HV_REG 0x62 /* Bank 0; 2 regs in VSEN range */
58 #define FANIN1_HV_REG 0x80 /* Bank 0; 2 regs (HV/LV) per sensor */
59 #define T_CPU1_HV_REG 0xA0 /* Bank 0; 2 regs (HV/LV) per sensor */
61 #define PRTS_REG 0x03 /* Bank 2 */
62 #define FANCTL1_FMR_REG 0x00 /* Bank 3; 1 reg per channel */
63 #define FANCTL1_OUT_REG 0x10 /* Bank 3; 1 reg per channel */
65 static const unsigned short normal_i2c[] = {
66 0x2d, 0x2e, I2C_CLIENT_END
70 struct i2c_client *client;
71 struct mutex bank_lock;
76 u8 fan_mode[FANCTL_MAX];
79 /* Access functions */
80 static int nct7904_bank_lock(struct nct7904_data *data, unsigned int bank)
84 mutex_lock(&data->bank_lock);
85 if (data->bank_sel == bank)
87 ret = i2c_smbus_write_byte_data(data->client, BANK_SEL_REG, bank);
89 data->bank_sel = bank;
95 static inline void nct7904_bank_release(struct nct7904_data *data)
97 mutex_unlock(&data->bank_lock);
100 /* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
101 static int nct7904_read_reg(struct nct7904_data *data,
102 unsigned int bank, unsigned int reg)
104 struct i2c_client *client = data->client;
107 ret = nct7904_bank_lock(data, bank);
109 ret = i2c_smbus_read_byte_data(client, reg);
111 nct7904_bank_release(data);
116 * Read 2-byte register. Returns register in big-endian format or
119 static int nct7904_read_reg16(struct nct7904_data *data,
120 unsigned int bank, unsigned int reg)
122 struct i2c_client *client = data->client;
125 ret = nct7904_bank_lock(data, bank);
127 ret = i2c_smbus_read_byte_data(client, reg);
130 ret = i2c_smbus_read_byte_data(client, reg + 1);
136 nct7904_bank_release(data);
140 /* Write 1-byte register. Returns 0 or -ERRNO on error. */
141 static int nct7904_write_reg(struct nct7904_data *data,
142 unsigned int bank, unsigned int reg, u8 val)
144 struct i2c_client *client = data->client;
147 ret = nct7904_bank_lock(data, bank);
149 ret = i2c_smbus_write_byte_data(client, reg, val);
151 nct7904_bank_release(data);
155 static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
158 struct nct7904_data *data = dev_get_drvdata(dev);
159 unsigned int cnt, rpm;
163 case hwmon_fan_input:
164 ret = nct7904_read_reg16(data, BANK_0,
165 FANIN1_HV_REG + channel * 2);
168 cnt = ((ret & 0xff00) >> 3) | (ret & 0x1f);
180 static umode_t nct7904_fan_is_visible(const void *_data, u32 attr, int channel)
182 const struct nct7904_data *data = _data;
184 if (attr == hwmon_fan_input && data->fanin_mask & (1 << channel))
189 static u8 nct7904_chan_to_index[] = {
191 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
195 static int nct7904_read_in(struct device *dev, u32 attr, int channel,
198 struct nct7904_data *data = dev_get_drvdata(dev);
199 int ret, volt, index;
201 index = nct7904_chan_to_index[channel];
205 ret = nct7904_read_reg16(data, BANK_0,
206 VSEN1_HV_REG + index * 2);
209 volt = ((ret & 0xff00) >> 5) | (ret & 0x7);
211 volt *= 2; /* 0.002V scale */
213 volt *= 6; /* 0.006V scale */
221 static umode_t nct7904_in_is_visible(const void *_data, u32 attr, int channel)
223 const struct nct7904_data *data = _data;
224 int index = nct7904_chan_to_index[channel];
226 if (channel > 0 && attr == hwmon_in_input &&
227 (data->vsen_mask & BIT(index)))
233 static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
236 struct nct7904_data *data = dev_get_drvdata(dev);
240 case hwmon_temp_input:
242 ret = nct7904_read_reg16(data, BANK_0, LTD_HV_REG);
244 ret = nct7904_read_reg16(data, BANK_0,
245 T_CPU1_HV_REG + (channel - 1) * 2);
248 temp = ((ret & 0xff00) >> 5) | (ret & 0x7);
249 *val = sign_extend32(temp, 10) * 125;
256 static umode_t nct7904_temp_is_visible(const void *_data, u32 attr, int channel)
258 const struct nct7904_data *data = _data;
260 if (attr == hwmon_temp_input) {
262 if (data->vsen_mask & BIT(17))
265 if (data->tcpu_mask & BIT(channel - 1))
273 static int nct7904_read_pwm(struct device *dev, u32 attr, int channel,
276 struct nct7904_data *data = dev_get_drvdata(dev);
280 case hwmon_pwm_input:
281 ret = nct7904_read_reg(data, BANK_3, FANCTL1_OUT_REG + channel);
286 case hwmon_pwm_enable:
287 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + channel);
298 static int nct7904_write_pwm(struct device *dev, u32 attr, int channel,
301 struct nct7904_data *data = dev_get_drvdata(dev);
305 case hwmon_pwm_input:
306 if (val < 0 || val > 255)
308 ret = nct7904_write_reg(data, BANK_3, FANCTL1_OUT_REG + channel,
311 case hwmon_pwm_enable:
312 if (val < 1 || val > 2 ||
313 (val == 2 && !data->fan_mode[channel]))
315 ret = nct7904_write_reg(data, BANK_3, FANCTL1_FMR_REG + channel,
316 val == 2 ? data->fan_mode[channel] : 0);
323 static umode_t nct7904_pwm_is_visible(const void *_data, u32 attr, int channel)
326 case hwmon_pwm_input:
327 case hwmon_pwm_enable:
328 return S_IRUGO | S_IWUSR;
334 static int nct7904_read(struct device *dev, enum hwmon_sensor_types type,
335 u32 attr, int channel, long *val)
339 return nct7904_read_in(dev, attr, channel, val);
341 return nct7904_read_fan(dev, attr, channel, val);
343 return nct7904_read_pwm(dev, attr, channel, val);
345 return nct7904_read_temp(dev, attr, channel, val);
351 static int nct7904_write(struct device *dev, enum hwmon_sensor_types type,
352 u32 attr, int channel, long val)
356 return nct7904_write_pwm(dev, attr, channel, val);
362 static umode_t nct7904_is_visible(const void *data,
363 enum hwmon_sensor_types type,
364 u32 attr, int channel)
368 return nct7904_in_is_visible(data, attr, channel);
370 return nct7904_fan_is_visible(data, attr, channel);
372 return nct7904_pwm_is_visible(data, attr, channel);
374 return nct7904_temp_is_visible(data, attr, channel);
380 /* Return 0 if detection is successful, -ENODEV otherwise */
381 static int nct7904_detect(struct i2c_client *client,
382 struct i2c_board_info *info)
384 struct i2c_adapter *adapter = client->adapter;
386 if (!i2c_check_functionality(adapter,
387 I2C_FUNC_SMBUS_READ_BYTE |
388 I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
391 /* Determine the chip type. */
392 if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID ||
393 i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID ||
394 (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 ||
395 (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00)
398 strlcpy(info->type, "nct7904", I2C_NAME_SIZE);
403 static const u32 nct7904_in_config[] = {
404 HWMON_I_INPUT, /* dummy, skipped in is_visible */
428 static const struct hwmon_channel_info nct7904_in = {
430 .config = nct7904_in_config,
433 static const u32 nct7904_fan_config[] = {
445 static const struct hwmon_channel_info nct7904_fan = {
447 .config = nct7904_fan_config,
450 static const u32 nct7904_pwm_config[] = {
451 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
452 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
453 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
454 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
458 static const struct hwmon_channel_info nct7904_pwm = {
460 .config = nct7904_pwm_config,
463 static const u32 nct7904_temp_config[] = {
476 static const struct hwmon_channel_info nct7904_temp = {
478 .config = nct7904_temp_config,
481 static const struct hwmon_channel_info *nct7904_info[] = {
489 static const struct hwmon_ops nct7904_hwmon_ops = {
490 .is_visible = nct7904_is_visible,
491 .read = nct7904_read,
492 .write = nct7904_write,
495 static const struct hwmon_chip_info nct7904_chip_info = {
496 .ops = &nct7904_hwmon_ops,
497 .info = nct7904_info,
500 static int nct7904_probe(struct i2c_client *client,
501 const struct i2c_device_id *id)
503 struct nct7904_data *data;
504 struct device *hwmon_dev;
505 struct device *dev = &client->dev;
509 data = devm_kzalloc(dev, sizeof(struct nct7904_data), GFP_KERNEL);
513 data->client = client;
514 mutex_init(&data->bank_lock);
517 /* Setup sensor groups. */
518 /* FANIN attributes */
519 ret = nct7904_read_reg16(data, BANK_0, FANIN_CTRL0_REG);
522 data->fanin_mask = (ret >> 8) | ((ret & 0xff) << 8);
527 * Note: voltage sensors overlap with external temperature
528 * sensors. So, if we ever decide to support the latter
529 * we will have to adjust 'vsen_mask' accordingly.
532 ret = nct7904_read_reg16(data, BANK_0, VT_ADC_CTRL0_REG);
534 mask = (ret >> 8) | ((ret & 0xff) << 8);
535 ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
538 data->vsen_mask = mask;
540 /* CPU_TEMP attributes */
541 ret = nct7904_read_reg16(data, BANK_0, DTS_T_CTRL0_REG);
544 data->tcpu_mask = ((ret >> 8) & 0xf) | ((ret & 0xf) << 4);
546 for (i = 0; i < FANCTL_MAX; i++) {
547 ret = nct7904_read_reg(data, BANK_3, FANCTL1_FMR_REG + i);
550 data->fan_mode[i] = ret;
554 devm_hwmon_device_register_with_info(dev, client->name, data,
555 &nct7904_chip_info, NULL);
556 return PTR_ERR_OR_ZERO(hwmon_dev);
559 static const struct i2c_device_id nct7904_id[] = {
563 MODULE_DEVICE_TABLE(i2c, nct7904_id);
565 static struct i2c_driver nct7904_driver = {
566 .class = I2C_CLASS_HWMON,
570 .probe = nct7904_probe,
571 .id_table = nct7904_id,
572 .detect = nct7904_detect,
573 .address_list = normal_i2c,
576 module_i2c_driver(nct7904_driver);
579 MODULE_DESCRIPTION("Hwmon driver for NUVOTON NCT7904");
580 MODULE_LICENSE("GPL");