^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2010 LaCie
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Simon Guinot <sguinot@lacie.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/thermal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct gpio_fan_speed {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int rpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int ctrl_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct gpio_fan_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* Cooling device if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct thermal_cooling_device *cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct mutex lock; /* lock GPIOs operations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int num_gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct gpio_desc **gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int num_speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct gpio_fan_speed *speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int resume_speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) bool pwm_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct gpio_desc *alarm_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct work_struct alarm_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Alarm GPIO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static void fan_alarm_notify(struct work_struct *ws)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct gpio_fan_data *fan_data =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) container_of(ws, struct gpio_fan_data, alarm_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) sysfs_notify(&fan_data->hwmon_dev->kobj, NULL, "fan1_alarm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) kobject_uevent(&fan_data->hwmon_dev->kobj, KOBJ_CHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct gpio_fan_data *fan_data = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) schedule_work(&fan_data->alarm_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static ssize_t fan1_alarm_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return sprintf(buf, "%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) gpiod_get_value_cansleep(fan_data->alarm_gpio));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static DEVICE_ATTR_RO(fan1_alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int fan_alarm_init(struct gpio_fan_data *fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int alarm_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct device *dev = fan_data->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * If the alarm GPIO don't support interrupts, just leave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * without initializing the fail notification support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) alarm_irq = gpiod_to_irq(fan_data->alarm_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (alarm_irq <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) IRQF_SHARED, "GPIO fan alarm", fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * Control GPIOs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* Must be called with fan_data->lock held, except during initialization. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for (i = 0; i < fan_data->num_gpios; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) gpiod_set_value_cansleep(fan_data->gpios[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) (ctrl_val >> i) & 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int ctrl_val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) for (i = 0; i < fan_data->num_gpios; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) value = gpiod_get_value_cansleep(fan_data->gpios[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ctrl_val |= (value << i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return ctrl_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* Must be called with fan_data->lock held, except during initialization. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (fan_data->speed_index == speed_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) fan_data->speed_index = speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int get_fan_speed_index(struct gpio_fan_data *fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int ctrl_val = __get_fan_ctrl(fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) for (i = 0; i < fan_data->num_speed; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (fan_data->speed[i].ctrl_val == ctrl_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) dev_warn(fan_data->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct gpio_fan_speed *speed = fan_data->speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) for (i = 0; i < fan_data->num_speed; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (speed[i].rpm >= rpm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return fan_data->num_speed - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return sprintf(buf, "%d\n", pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) unsigned long pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (kstrtoul(buf, 10, &pwm) || pwm > 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) mutex_lock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (!fan_data->pwm_enable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) set_fan_speed(fan_data, speed_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) exit_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) mutex_unlock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static ssize_t pwm1_enable_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return sprintf(buf, "%d\n", fan_data->pwm_enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static ssize_t pwm1_enable_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (kstrtoul(buf, 10, &val) || val > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (fan_data->pwm_enable == val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) mutex_lock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) fan_data->pwm_enable = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Disable manual control mode: set fan at full speed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (val == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) set_fan_speed(fan_data, fan_data->num_speed - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) mutex_unlock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static ssize_t pwm1_mode_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return sprintf(buf, "0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static ssize_t fan1_min_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static ssize_t fan1_max_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return sprintf(buf, "%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) fan_data->speed[fan_data->num_speed - 1].rpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static ssize_t fan1_input_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) unsigned long rpm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) int ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (kstrtoul(buf, 10, &rpm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) mutex_lock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (!fan_data->pwm_enable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) goto exit_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) exit_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) mutex_unlock(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static DEVICE_ATTR_RW(pwm1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static DEVICE_ATTR_RW(pwm1_enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static DEVICE_ATTR_RO(pwm1_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static DEVICE_ATTR_RO(fan1_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static DEVICE_ATTR_RO(fan1_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) static DEVICE_ATTR_RO(fan1_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static DEVICE_ATTR(fan1_target, 0644, fan1_input_show, set_rpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static umode_t gpio_fan_is_visible(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct attribute *attr, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct device *dev = container_of(kobj, struct device, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct gpio_fan_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (index == 0 && !data->alarm_gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (index > 0 && !data->gpios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static struct attribute *gpio_fan_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) &dev_attr_fan1_alarm.attr, /* 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) &dev_attr_pwm1.attr, /* 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) &dev_attr_pwm1_enable.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) &dev_attr_pwm1_mode.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) &dev_attr_fan1_input.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) &dev_attr_fan1_target.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) &dev_attr_fan1_min.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) &dev_attr_fan1_max.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static const struct attribute_group gpio_fan_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) .attrs = gpio_fan_attributes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) .is_visible = gpio_fan_is_visible,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static const struct attribute_group *gpio_fan_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) &gpio_fan_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static int fan_ctrl_init(struct gpio_fan_data *fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int num_gpios = fan_data->num_gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct gpio_desc **gpios = fan_data->gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) for (i = 0; i < num_gpios; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * The GPIO descriptors were retrieved with GPIOD_ASIS so here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * we set the GPIO into output mode, carefully preserving the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * current value by setting it to whatever it is already set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * (no surprise changes in default fan speed).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) err = gpiod_direction_output(gpios[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) gpiod_get_value_cansleep(gpios[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) fan_data->pwm_enable = true; /* Enable manual fan speed control. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) fan_data->speed_index = get_fan_speed_index(fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (fan_data->speed_index < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return fan_data->speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) unsigned long *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct gpio_fan_data *fan_data = cdev->devdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (!fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *state = fan_data->num_speed - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) unsigned long *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) struct gpio_fan_data *fan_data = cdev->devdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) if (!fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) *state = fan_data->speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) unsigned long state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct gpio_fan_data *fan_data = cdev->devdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (!fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) set_fan_speed(fan_data, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static const struct thermal_cooling_device_ops gpio_fan_cool_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) .get_max_state = gpio_fan_get_max_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) .get_cur_state = gpio_fan_get_cur_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) .set_cur_state = gpio_fan_set_cur_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * Translate OpenFirmware node properties into platform_data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static int gpio_fan_get_of_data(struct gpio_fan_data *fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct gpio_fan_speed *speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct device *dev = fan_data->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct device_node *np = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct gpio_desc **gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) u32 u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) const __be32 *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* Alarm GPIO if one exists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) fan_data->alarm_gpio = devm_gpiod_get_optional(dev, "alarm", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (IS_ERR(fan_data->alarm_gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return PTR_ERR(fan_data->alarm_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /* Fill GPIO pin array */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) fan_data->num_gpios = gpiod_count(dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (fan_data->num_gpios <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (fan_data->alarm_gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) dev_err(dev, "DT properties empty / missing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) gpios = devm_kcalloc(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) fan_data->num_gpios, sizeof(struct gpio_desc *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (!gpios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) for (i = 0; i < fan_data->num_gpios; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) gpios[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (IS_ERR(gpios[i]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return PTR_ERR(gpios[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) fan_data->gpios = gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) /* Get number of RPM/ctrl_val pairs in speed map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) prop = of_find_property(np, "gpio-fan,speed-map", &i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) dev_err(dev, "gpio-fan,speed-map DT property missing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) i = i / sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (i == 0 || i & 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) fan_data->num_speed = i / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * Populate speed map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) * this needs splitting into pairs to create gpio_fan_speed structs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) speed = devm_kcalloc(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) fan_data->num_speed, sizeof(struct gpio_fan_speed),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (!speed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) for (i = 0; i < fan_data->num_speed; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) p = of_prop_next_u32(prop, p, &u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) speed[i].rpm = u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) p = of_prop_next_u32(prop, p, &u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) speed[i].ctrl_val = u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) fan_data->speed = speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) static const struct of_device_id of_gpio_fan_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) { .compatible = "gpio-fan", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) MODULE_DEVICE_TABLE(of, of_gpio_fan_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) static void gpio_fan_stop(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) set_fan_speed(data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) static int gpio_fan_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) struct gpio_fan_data *fan_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct device_node *np = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) fan_data = devm_kzalloc(dev, sizeof(struct gpio_fan_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (!fan_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) fan_data->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) err = gpio_fan_get_of_data(fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) platform_set_drvdata(pdev, fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) mutex_init(&fan_data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /* Configure control GPIOs if available. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (fan_data->gpios && fan_data->num_gpios > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (!fan_data->speed || fan_data->num_speed <= 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) err = fan_ctrl_init(fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) err = devm_add_action_or_reset(dev, gpio_fan_stop, fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) /* Make this driver part of hwmon class. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) fan_data->hwmon_dev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) devm_hwmon_device_register_with_groups(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) "gpio_fan", fan_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) gpio_fan_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (IS_ERR(fan_data->hwmon_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return PTR_ERR(fan_data->hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) /* Configure alarm GPIO if available. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (fan_data->alarm_gpio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) err = fan_alarm_init(fan_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) /* Optional cooling device register for Device tree platforms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) fan_data->cdev = devm_thermal_of_cooling_device_register(dev, np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) "gpio-fan", fan_data, &gpio_fan_cool_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) dev_info(dev, "GPIO fan initialized\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) static void gpio_fan_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (fan_data->gpios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) set_fan_speed(fan_data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) static int gpio_fan_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) if (fan_data->gpios) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) fan_data->resume_speed = fan_data->speed_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) set_fan_speed(fan_data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) static int gpio_fan_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (fan_data->gpios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) set_fan_speed(fan_data, fan_data->resume_speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) #define GPIO_FAN_PM (&gpio_fan_pm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) #define GPIO_FAN_PM NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) static struct platform_driver gpio_fan_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) .probe = gpio_fan_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) .shutdown = gpio_fan_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) .name = "gpio-fan",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) .pm = GPIO_FAN_PM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) .of_match_table = of_match_ptr(of_gpio_fan_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) module_platform_driver(gpio_fan_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) MODULE_DESCRIPTION("GPIO FAN driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) MODULE_ALIAS("platform:gpio-fan");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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