hwmon: (emc2305) add support for EMC2301/2/3/5 RPM-based PWM Fan Speed Controller.
Add driver for Microchip EMC2301/2/3/5 RPM-based PWM Fan Speed Controller. Modify Makefile and Kconfig to support Microchip EMC2305 RPM-based PWM Fan Speed Controller. Signed-off-by: Michael Shych <michaelsh@nvidia.com> Reviewed-by: Vadim Pasternak <vadimp@nvidia.com> Link: https://lore.kernel.org/r/20220810171552.56417-3-michaelsh@nvidia.com [groeck: Drop unnecessary () around DIV_ROUND_CLOSEST()] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Michael Shych
Guenter Roeck
parent
41929b72eb
commit
0d8400c5a2
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@ -1785,6 +1785,19 @@ config SENSORS_EMC2103
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This driver can also be built as a module. If so, the module
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will be called emc2103.
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config SENSORS_EMC2305
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tristate "Microchip EMC2305 and compatible EMC2301/2/3"
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depends on I2C
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imply THERMAL
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help
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If you say yes here you get support for the Microchip EMC2305
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fan controller chips.
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The Microchip EMC2305 is a fan controller for up to 5 fans.
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Fan rotation speeds are reported in RPM.
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This driver can also be built as a module. If so, the module
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will be called emc2305.
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config SENSORS_EMC6W201
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tristate "SMSC EMC6W201"
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depends on I2C
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@ -69,6 +69,7 @@ obj-$(CONFIG_SENSORS_DS620) += ds620.o
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obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
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obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
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obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o
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obj-$(CONFIG_SENSORS_EMC2305) += emc2305.o
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obj-$(CONFIG_SENSORS_EMC6W201) += emc6w201.o
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obj-$(CONFIG_SENSORS_F71805F) += f71805f.o
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obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o
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@ -0,0 +1,624 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hardware monitoring driver for EMC2305 fan controller
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*
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* Copyright (C) 2022 Nvidia Technologies Ltd.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/platform_data/emc2305.h>
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#include <linux/thermal.h>
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#include <linux/version.h>
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static const unsigned short
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emc2305_normal_i2c[] = { 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d, I2C_CLIENT_END };
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#define EMC2305_REG_DRIVE_FAIL_STATUS 0x27
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#define EMC2305_REG_DEVICE 0xfd
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#define EMC2305_REG_VENDOR 0xfe
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#define EMC2305_FAN_MAX 0xff
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#define EMC2305_FAN_MIN 0x00
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#define EMC2305_FAN_MAX_STATE 10
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#define EMC2305_DEVICE 0x34
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#define EMC2305_VENDOR 0x5d
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#define EMC2305_REG_PRODUCT_ID 0xfd
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#define EMC2305_TACH_REGS_UNUSE_BITS 3
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#define EMC2305_TACH_CNT_MULTIPLIER 0x02
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#define EMC2305_TACH_RANGE_MIN 480
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#define EMC2305_PWM_DUTY2STATE(duty, max_state, pwm_max) \
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DIV_ROUND_CLOSEST((duty) * (max_state), (pwm_max))
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#define EMC2305_PWM_STATE2DUTY(state, max_state, pwm_max) \
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DIV_ROUND_CLOSEST((state) * (pwm_max), (max_state))
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/*
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* Factor by equations [2] and [3] from data sheet; valid for fans where the number of edges
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* equal (poles * 2 + 1).
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*/
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#define EMC2305_RPM_FACTOR 3932160
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#define EMC2305_REG_FAN_DRIVE(n) (0x30 + 0x10 * (n))
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#define EMC2305_REG_FAN_MIN_DRIVE(n) (0x38 + 0x10 * (n))
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#define EMC2305_REG_FAN_TACH(n) (0x3e + 0x10 * (n))
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enum emc230x_product_id {
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EMC2305 = 0x34,
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EMC2303 = 0x35,
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EMC2302 = 0x36,
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EMC2301 = 0x37,
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};
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static const struct i2c_device_id emc2305_ids[] = {
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{ "emc2305", 0 },
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{ "emc2303", 0 },
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{ "emc2302", 0 },
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{ "emc2301", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, emc2305_ids);
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/**
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* @cdev: cooling device;
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* @curr_state: cooling current state;
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* @last_hwmon_state: last cooling state updated by hwmon subsystem;
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* @last_thermal_state: last cooling state updated by thermal subsystem;
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*
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* The 'last_hwmon_state' and 'last_thermal_state' fields are provided to support fan low limit
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* speed feature. The purpose of this feature is to provides ability to limit fan speed
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* according to some system wise considerations, like absence of some replaceable units (PSU or
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* line cards), high system ambient temperature, unreliable transceivers temperature sensing or
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* some other factors which indirectly impacts system's airflow
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* Fan low limit feature is supported through 'hwmon' interface: 'hwmon' 'pwm' attribute is
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* used for setting low limit for fan speed in case 'thermal' subsystem is configured in
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* kernel. In this case setting fan speed through 'hwmon' will never let the 'thermal'
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* subsystem to select a lower duty cycle than the duty cycle selected with the 'pwm'
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* attribute.
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* From other side, fan speed is to be updated in hardware through 'pwm' only in case the
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* requested fan speed is above last speed set by 'thermal' subsystem, otherwise requested fan
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* speed will be just stored with no PWM update.
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*/
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struct emc2305_cdev_data {
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struct thermal_cooling_device *cdev;
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unsigned int cur_state;
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unsigned long last_hwmon_state;
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unsigned long last_thermal_state;
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};
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/**
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* @client: i2c client;
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* @hwmon_dev: hwmon device;
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* @max_state: maximum cooling state of the cooling device;
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* @pwm_num: number of PWM channels;
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* @pwm_separate: separate PWM settings for every channel;
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* @pwm_min: array of minimum PWM per channel;
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* @cdev_data: array of cooling devices data;
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*/
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struct emc2305_data {
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struct i2c_client *client;
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struct device *hwmon_dev;
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u8 max_state;
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u8 pwm_num;
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bool pwm_separate;
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u8 pwm_min[EMC2305_PWM_MAX];
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struct emc2305_cdev_data cdev_data[EMC2305_PWM_MAX];
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};
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static char *emc2305_fan_name[] = {
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"emc2305_fan",
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"emc2305_fan1",
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"emc2305_fan2",
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"emc2305_fan3",
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"emc2305_fan4",
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"emc2305_fan5",
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};
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static void emc2305_unset_tz(struct device *dev);
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static int emc2305_get_max_channel(const struct emc2305_data *data)
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{
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return data->pwm_num;
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}
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static int emc2305_get_cdev_idx(struct thermal_cooling_device *cdev)
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{
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struct emc2305_data *data = cdev->devdata;
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size_t len = strlen(cdev->type);
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int ret;
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if (len <= 0)
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return -EINVAL;
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/*
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* Returns index of cooling device 0..4 in case of separate PWM setting.
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* Zero index is used in case of one common PWM setting.
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* If the mode is not set as pwm_separate, all PWMs are to be bound
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* to the common thermal zone and should work at the same speed
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* to perform cooling for the same thermal junction.
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* Otherwise, return specific channel that will be used in bound
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* related PWM to the thermal zone.
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*/
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if (!data->pwm_separate)
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return 0;
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ret = cdev->type[len - 1];
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switch (ret) {
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case '1' ... '5':
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return ret - '1';
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default:
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break;
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}
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return -EINVAL;
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}
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static int emc2305_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state)
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{
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int cdev_idx;
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struct emc2305_data *data = cdev->devdata;
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cdev_idx = emc2305_get_cdev_idx(cdev);
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if (cdev_idx < 0)
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return cdev_idx;
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*state = data->cdev_data[cdev_idx].cur_state;
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return 0;
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}
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static int emc2305_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state)
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{
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struct emc2305_data *data = cdev->devdata;
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*state = data->max_state;
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return 0;
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}
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static int emc2305_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
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int cdev_idx, ret;
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struct emc2305_data *data = cdev->devdata;
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struct i2c_client *client = data->client;
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u8 val, i;
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if (state > data->max_state)
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return -EINVAL;
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cdev_idx = emc2305_get_cdev_idx(cdev);
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if (cdev_idx < 0)
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return cdev_idx;
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/* Save thermal state. */
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data->cdev_data[cdev_idx].last_thermal_state = state;
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state = max_t(unsigned long, state, data->cdev_data[cdev_idx].last_hwmon_state);
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val = EMC2305_PWM_STATE2DUTY(state, data->max_state, EMC2305_FAN_MAX);
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if (val > EMC2305_FAN_MAX)
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return -EINVAL;
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data->cdev_data[cdev_idx].cur_state = state;
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if (data->pwm_separate) {
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ret = i2c_smbus_write_byte_data(client, EMC2305_REG_FAN_DRIVE(cdev_idx), val);
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if (ret < 0)
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return ret;
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} else {
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/*
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* Set the same PWM value in all channels
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* if common PWM channel is used.
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*/
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for (i = 0; i < data->pwm_num; i++) {
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ret = i2c_smbus_write_byte_data(client, EMC2305_REG_FAN_DRIVE(i), val);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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static const struct thermal_cooling_device_ops emc2305_cooling_ops = {
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.get_max_state = emc2305_get_max_state,
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.get_cur_state = emc2305_get_cur_state,
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.set_cur_state = emc2305_set_cur_state,
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};
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static int emc2305_show_fault(struct device *dev, int channel)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int status_reg;
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status_reg = i2c_smbus_read_byte_data(client, EMC2305_REG_DRIVE_FAIL_STATUS);
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if (status_reg < 0)
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return status_reg;
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return status_reg & (1 << channel) ? 1 : 0;
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}
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static int emc2305_show_fan(struct device *dev, int channel)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int ret;
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ret = i2c_smbus_read_word_swapped(client, EMC2305_REG_FAN_TACH(channel));
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if (ret <= 0)
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return ret;
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ret = ret >> EMC2305_TACH_REGS_UNUSE_BITS;
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ret = EMC2305_RPM_FACTOR / ret;
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if (ret <= EMC2305_TACH_RANGE_MIN)
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return 0;
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return ret * EMC2305_TACH_CNT_MULTIPLIER;
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}
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static int emc2305_show_pwm(struct device *dev, int channel)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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return i2c_smbus_read_byte_data(client, EMC2305_REG_FAN_DRIVE(channel));
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}
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static int emc2305_set_pwm(struct device *dev, long val, int channel)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int ret;
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if (val < data->pwm_min[channel] || val > EMC2305_FAN_MAX)
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return -EINVAL;
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ret = i2c_smbus_write_byte_data(client, EMC2305_REG_FAN_DRIVE(channel), val);
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if (ret < 0)
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return ret;
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data->cdev_data[channel].cur_state = EMC2305_PWM_DUTY2STATE(val, data->max_state,
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EMC2305_FAN_MAX);
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return 0;
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}
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static int emc2305_set_single_tz(struct device *dev, int idx)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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long pwm;
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int i, cdev_idx, ret;
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cdev_idx = (idx) ? idx - 1 : 0;
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pwm = data->pwm_min[cdev_idx];
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data->cdev_data[cdev_idx].cdev =
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thermal_cooling_device_register(emc2305_fan_name[idx], data,
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&emc2305_cooling_ops);
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if (IS_ERR(data->cdev_data[cdev_idx].cdev)) {
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dev_err(dev, "Failed to register cooling device %s\n", emc2305_fan_name[idx]);
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return PTR_ERR(data->cdev_data[cdev_idx].cdev);
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}
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/* Set minimal PWM speed. */
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if (data->pwm_separate) {
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ret = emc2305_set_pwm(dev, pwm, cdev_idx);
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if (ret < 0)
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return ret;
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} else {
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for (i = 0; i < data->pwm_num; i++) {
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ret = emc2305_set_pwm(dev, pwm, i);
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if (ret < 0)
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return ret;
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}
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}
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data->cdev_data[cdev_idx].cur_state =
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EMC2305_PWM_DUTY2STATE(data->pwm_min[cdev_idx], data->max_state,
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EMC2305_FAN_MAX);
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data->cdev_data[cdev_idx].last_hwmon_state =
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EMC2305_PWM_DUTY2STATE(data->pwm_min[cdev_idx], data->max_state,
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EMC2305_FAN_MAX);
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return 0;
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}
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static int emc2305_set_tz(struct device *dev)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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int i, ret;
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if (!data->pwm_separate)
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return emc2305_set_single_tz(dev, 0);
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for (i = 0; i < data->pwm_num; i++) {
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ret = emc2305_set_single_tz(dev, i + 1);
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if (ret)
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goto thermal_cooling_device_register_fail;
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}
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return 0;
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thermal_cooling_device_register_fail:
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emc2305_unset_tz(dev);
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return ret;
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}
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static void emc2305_unset_tz(struct device *dev)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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int i;
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/* Unregister cooling device. */
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for (i = 0; i < EMC2305_PWM_MAX; i++)
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if (data->cdev_data[i].cdev)
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thermal_cooling_device_unregister(data->cdev_data[i].cdev);
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}
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static umode_t
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emc2305_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel)
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{
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int max_channel = emc2305_get_max_channel(data);
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/* Don't show channels which are not physically connected. */
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if (channel >= max_channel)
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return 0;
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switch (type) {
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_input:
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return 0444;
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case hwmon_fan_fault:
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return 0444;
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default:
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break;
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}
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break;
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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return 0644;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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};
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static int
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emc2305_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val)
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{
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struct emc2305_data *data = dev_get_drvdata(dev);
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int cdev_idx;
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switch (type) {
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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/* If thermal is configured - handle PWM limit setting. */
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if (IS_REACHABLE(CONFIG_THERMAL)) {
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if (data->pwm_separate)
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cdev_idx = channel;
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else
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cdev_idx = 0;
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data->cdev_data[cdev_idx].last_hwmon_state =
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EMC2305_PWM_DUTY2STATE(val, data->max_state,
|
||||
EMC2305_FAN_MAX);
|
||||
/*
|
||||
* Update PWM only in case requested state is not less than the
|
||||
* last thermal state.
|
||||
*/
|
||||
if (data->cdev_data[cdev_idx].last_hwmon_state >=
|
||||
data->cdev_data[cdev_idx].last_thermal_state)
|
||||
return emc2305_set_cur_state(data->cdev_data[cdev_idx].cdev,
|
||||
data->cdev_data[cdev_idx].last_hwmon_state);
|
||||
return 0;
|
||||
}
|
||||
return emc2305_set_pwm(dev, val, channel);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return -EOPNOTSUPP;
|
||||
};
|
||||
|
||||
static int
|
||||
emc2305_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val)
|
||||
{
|
||||
int ret;
|
||||
|
||||
switch (type) {
|
||||
case hwmon_fan:
|
||||
switch (attr) {
|
||||
case hwmon_fan_input:
|
||||
ret = emc2305_show_fan(dev, channel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = ret;
|
||||
return 0;
|
||||
case hwmon_fan_fault:
|
||||
ret = emc2305_show_fault(dev, channel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = ret;
|
||||
return 0;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case hwmon_pwm:
|
||||
switch (attr) {
|
||||
case hwmon_pwm_input:
|
||||
ret = emc2305_show_pwm(dev, channel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = ret;
|
||||
return 0;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return -EOPNOTSUPP;
|
||||
};
|
||||
|
||||
static const struct hwmon_ops emc2305_ops = {
|
||||
.is_visible = emc2305_is_visible,
|
||||
.read = emc2305_read,
|
||||
.write = emc2305_write,
|
||||
};
|
||||
|
||||
static const struct hwmon_channel_info *emc2305_info[] = {
|
||||
HWMON_CHANNEL_INFO(fan,
|
||||
HWMON_F_INPUT | HWMON_F_FAULT,
|
||||
HWMON_F_INPUT | HWMON_F_FAULT,
|
||||
HWMON_F_INPUT | HWMON_F_FAULT,
|
||||
HWMON_F_INPUT | HWMON_F_FAULT,
|
||||
HWMON_F_INPUT | HWMON_F_FAULT),
|
||||
HWMON_CHANNEL_INFO(pwm,
|
||||
HWMON_PWM_INPUT,
|
||||
HWMON_PWM_INPUT,
|
||||
HWMON_PWM_INPUT,
|
||||
HWMON_PWM_INPUT,
|
||||
HWMON_PWM_INPUT),
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct hwmon_chip_info emc2305_chip_info = {
|
||||
.ops = &emc2305_ops,
|
||||
.info = emc2305_info,
|
||||
};
|
||||
|
||||
static int emc2305_identify(struct device *dev)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct emc2305_data *data = i2c_get_clientdata(client);
|
||||
int ret;
|
||||
|
||||
ret = i2c_smbus_read_byte_data(client, EMC2305_REG_PRODUCT_ID);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
switch (ret) {
|
||||
case EMC2305:
|
||||
data->pwm_num = 5;
|
||||
break;
|
||||
case EMC2303:
|
||||
data->pwm_num = 3;
|
||||
break;
|
||||
case EMC2302:
|
||||
data->pwm_num = 2;
|
||||
break;
|
||||
case EMC2301:
|
||||
data->pwm_num = 1;
|
||||
break;
|
||||
default:
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int emc2305_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
||||
{
|
||||
struct i2c_adapter *adapter = client->adapter;
|
||||
struct device *dev = &client->dev;
|
||||
struct emc2305_data *data;
|
||||
struct emc2305_platform_data *pdata;
|
||||
int vendor, device;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
vendor = i2c_smbus_read_byte_data(client, EMC2305_REG_VENDOR);
|
||||
if (vendor != EMC2305_VENDOR)
|
||||
return -ENODEV;
|
||||
|
||||
device = i2c_smbus_read_byte_data(client, EMC2305_REG_DEVICE);
|
||||
if (device != EMC2305_DEVICE)
|
||||
return -ENODEV;
|
||||
|
||||
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, data);
|
||||
data->client = client;
|
||||
|
||||
ret = emc2305_identify(dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
pdata = dev_get_platdata(&client->dev);
|
||||
if (pdata) {
|
||||
if (!pdata->max_state || pdata->max_state > EMC2305_FAN_MAX_STATE)
|
||||
return -EINVAL;
|
||||
data->max_state = pdata->max_state;
|
||||
/*
|
||||
* Validate a number of active PWM channels. Note that
|
||||
* configured number can be less than the actual maximum
|
||||
* supported by the device.
|
||||
*/
|
||||
if (!pdata->pwm_num || pdata->pwm_num > EMC2305_PWM_MAX)
|
||||
return -EINVAL;
|
||||
data->pwm_num = pdata->pwm_num;
|
||||
data->pwm_separate = pdata->pwm_separate;
|
||||
for (i = 0; i < EMC2305_PWM_MAX; i++)
|
||||
data->pwm_min[i] = pdata->pwm_min[i];
|
||||
} else {
|
||||
data->max_state = EMC2305_FAN_MAX_STATE;
|
||||
data->pwm_separate = false;
|
||||
for (i = 0; i < EMC2305_PWM_MAX; i++)
|
||||
data->pwm_min[i] = EMC2305_FAN_MIN;
|
||||
}
|
||||
|
||||
data->hwmon_dev = devm_hwmon_device_register_with_info(dev, "emc2305", data,
|
||||
&emc2305_chip_info, NULL);
|
||||
if (IS_ERR(data->hwmon_dev))
|
||||
return PTR_ERR(data->hwmon_dev);
|
||||
|
||||
if (IS_REACHABLE(CONFIG_THERMAL)) {
|
||||
ret = emc2305_set_tz(dev);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
for (i = 0; i < data->pwm_num; i++) {
|
||||
ret = i2c_smbus_write_byte_data(client, EMC2305_REG_FAN_MIN_DRIVE(i),
|
||||
data->pwm_min[i]);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int emc2305_remove(struct i2c_client *client)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
|
||||
if (IS_REACHABLE(CONFIG_THERMAL))
|
||||
emc2305_unset_tz(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver emc2305_driver = {
|
||||
.class = I2C_CLASS_HWMON,
|
||||
.driver = {
|
||||
.name = "emc2305",
|
||||
},
|
||||
.probe = emc2305_probe,
|
||||
.remove = emc2305_remove,
|
||||
.id_table = emc2305_ids,
|
||||
.address_list = emc2305_normal_i2c,
|
||||
};
|
||||
|
||||
module_i2c_driver(emc2305_driver);
|
||||
|
||||
MODULE_AUTHOR("Nvidia");
|
||||
MODULE_DESCRIPTION("Microchip EMC2305 fan controller driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue