2  * max6650.c - Part of lm_sensors, Linux kernel modules for hardware
17  *        http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
40 #include <linux/hwmon-sysfs.h>
103 /* Minimum and maximum values of the FAN-RPM */
153 	struct i2c_client *client = data->client;  in max6650_update_device()
156 	mutex_lock(&data->update_lock);  in max6650_update_device()
158 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {  in max6650_update_device()
159 		data->speed = i2c_smbus_read_byte_data(client,  in max6650_update_device()
161 		data->config = i2c_smbus_read_byte_data(client,  in max6650_update_device()
163 		for (i = 0; i < data->nr_fans; i++) {  in max6650_update_device()
164 			data->tach[i] = i2c_smbus_read_byte_data(client,  in max6650_update_device()
167 		data->count = i2c_smbus_read_byte_data(client,  in max6650_update_device()
169 		data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);  in max6650_update_device()
176 		data->alarm |= i2c_smbus_read_byte_data(client,  in max6650_update_device()
179 		data->last_updated = jiffies;  in max6650_update_device()
180 		data->valid = 1;  in max6650_update_device()
183 	mutex_unlock(&data->update_lock);  in max6650_update_device()
195 	u8 config = data->config;  in max6650_set_operating_mode()
202 	result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG,  in max6650_set_operating_mode()
207 	data->config = config;  in max6650_set_operating_mode()
224 	 * that the fans produce two pulses per revolution (this seems  in get_fan()
228 	rpm = ((data->tach[attr->index] * 120) / DIV_FROM_REG(data->count));  in get_fan()
287 	kscale = DIV_FROM_REG(data->config);  in fan1_target_show()
288 	ktach = data->speed;  in fan1_target_show()
306 	 *     KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1  in max6650_set_target()
309 	kscale = DIV_FROM_REG(data->config);  in max6650_set_target()
310 	ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;  in max6650_set_target()
315 	data->speed = ktach;  in max6650_set_target()
317 	return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED,  in max6650_set_target()
318 					 data->speed);  in max6650_set_target()
333 	mutex_lock(&data->update_lock);  in fan1_target_store()
337 	mutex_unlock(&data->update_lock);  in fan1_target_store()
361 	 * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.  in pwm1_show()
364 	if (data->config & MAX6650_CFG_V12)  in pwm1_show()
365 		pwm = 255 - (255 * (int)data->dac)/180;  in pwm1_show()
367 		pwm = 255 - (255 * (int)data->dac)/76;  in pwm1_show()
380 	struct i2c_client *client = data->client;  in pwm1_store()
390 	mutex_lock(&data->update_lock);  in pwm1_store()
392 	if (data->config & MAX6650_CFG_V12)  in pwm1_store()
393 		data->dac = 180 - (180 * pwm)/255;  in pwm1_store()
395 		data->dac = 76 - (76 * pwm)/255;  in pwm1_store()
396 	err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);  in pwm1_store()
398 	mutex_unlock(&data->update_lock);  in pwm1_store()
415 	int mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;  in pwm1_enable_show()
440 		return -EINVAL;  in pwm1_enable_store()
442 	mutex_lock(&data->update_lock);  in pwm1_enable_store()
446 	mutex_unlock(&data->update_lock);  in pwm1_enable_store()
469 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->count));  in fan1_div_show()
477 	struct i2c_client *client = data->client;  in fan1_div_store()
485 	mutex_lock(&data->update_lock);  in fan1_div_store()
488 		data->count = 0;  in fan1_div_store()
491 		data->count = 1;  in fan1_div_store()
494 		data->count = 2;  in fan1_div_store()
497 		data->count = 3;  in fan1_div_store()
500 		mutex_unlock(&data->update_lock);  in fan1_div_store()
501 		return -EINVAL;  in fan1_div_store()
504 	i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);  in fan1_div_store()
505 	mutex_unlock(&data->update_lock);  in fan1_div_store()
522 	struct i2c_client *client = data->client;  in get_alarm()
525 	if (data->alarm & attr->index) {  in get_alarm()
526 		mutex_lock(&data->update_lock);  in get_alarm()
528 		data->alarm &= ~attr->index;  in get_alarm()
529 		data->alarm |= i2c_smbus_read_byte_data(client,  in get_alarm()
531 		mutex_unlock(&data->update_lock);  in get_alarm()
561 	struct i2c_client *client = data->client;  in max6650_attrs_visible()
575 		if (!(alarm_en & to_sensor_dev_attr(devattr)->index))  in max6650_attrs_visible()
579 	return a->mode;  in max6650_attrs_visible()
619 	struct device *dev = &client->dev;  in max6650_init_client()
621 	int err = -EIO;  in max6650_init_client()
626 	if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt",  in max6650_init_client()
631 	if (of_property_read_u32(dev->of_node, "maxim,fan-prescale",  in max6650_init_client()
690 	data->config = config;  in max6650_init_client()
691 	data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);  in max6650_init_client()
693 	if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",  in max6650_init_client()
705 	struct device *dev = &client->dev;  in max6650_probe()
714 		return -ENOMEM;  in max6650_probe()
716 	data->client = client;  in max6650_probe()
717 	mutex_init(&data->update_lock);  in max6650_probe()
718 	data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : id->driver_data;  in max6650_probe()
727 	data->groups[0] = &max6650_group;  in max6650_probe()
729 	if (data->nr_fans == 4)  in max6650_probe()
730 		data->groups[1] = &max6651_group;  in max6650_probe()
733 							   client->name, data,  in max6650_probe()
734 							   data->groups);  in max6650_probe()