Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Support for polling mode for input devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "input-poller.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) struct input_dev_poller {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	void (*poll)(struct input_dev *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	unsigned int poll_interval; /* msec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	unsigned int poll_interval_max; /* msec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	unsigned int poll_interval_min; /* msec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct delayed_work work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static void input_dev_poller_queue_work(struct input_dev_poller *poller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	unsigned long delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	delay = msecs_to_jiffies(poller->poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (delay >= HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		delay = round_jiffies_relative(delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	queue_delayed_work(system_freezable_wq, &poller->work, delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static void input_dev_poller_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct input_dev_poller *poller =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		container_of(work, struct input_dev_poller, work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	poller->poll(poller->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	input_dev_poller_queue_work(poller);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) void input_dev_poller_finalize(struct input_dev_poller *poller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (!poller->poll_interval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		poller->poll_interval = 500;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (!poller->poll_interval_max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		poller->poll_interval_max = poller->poll_interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) void input_dev_poller_start(struct input_dev_poller *poller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	/* Only start polling if polling is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if (poller->poll_interval > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		poller->poll(poller->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		input_dev_poller_queue_work(poller);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) void input_dev_poller_stop(struct input_dev_poller *poller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	cancel_delayed_work_sync(&poller->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) int input_setup_polling(struct input_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			void (*poll_fn)(struct input_dev *dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct input_dev_poller *poller;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	poller = kzalloc(sizeof(*poller), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (!poller) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		 * We want to show message even though kzalloc() may have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		 * printed backtrace as knowing what instance of input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		 * device we were dealing with is helpful.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		dev_err(dev->dev.parent ?: &dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			"%s: unable to allocate poller structure\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	INIT_DELAYED_WORK(&poller->work, input_dev_poller_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	poller->input = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	poller->poll = poll_fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	dev->poller = poller;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) EXPORT_SYMBOL(input_setup_polling);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static bool input_dev_ensure_poller(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (!dev->poller) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		dev_err(dev->dev.parent ?: &dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			"poller structure has not been set up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) void input_set_poll_interval(struct input_dev *dev, unsigned int interval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (input_dev_ensure_poller(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		dev->poller->poll_interval = interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) EXPORT_SYMBOL(input_set_poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void input_set_min_poll_interval(struct input_dev *dev, unsigned int interval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (input_dev_ensure_poller(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		dev->poller->poll_interval_min = interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) EXPORT_SYMBOL(input_set_min_poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) void input_set_max_poll_interval(struct input_dev *dev, unsigned int interval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (input_dev_ensure_poller(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		dev->poller->poll_interval_max = interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) EXPORT_SYMBOL(input_set_max_poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int input_get_poll_interval(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (!dev->poller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	return dev->poller->poll_interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) EXPORT_SYMBOL(input_get_poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* SYSFS interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static ssize_t input_dev_get_poll_interval(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 					   struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 					   char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct input_dev *input = to_input_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return sprintf(buf, "%d\n", input->poller->poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static ssize_t input_dev_set_poll_interval(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 					   struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 					   const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct input_dev *input = to_input_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	struct input_dev_poller *poller = input->poller;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	unsigned int interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	err = kstrtouint(buf, 0, &interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (interval < poller->poll_interval_min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (interval > poller->poll_interval_max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	mutex_lock(&input->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	poller->poll_interval = interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (input->users) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		cancel_delayed_work_sync(&poller->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (poller->poll_interval > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			input_dev_poller_queue_work(poller);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	mutex_unlock(&input->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static DEVICE_ATTR(poll, 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		   input_dev_get_poll_interval, input_dev_set_poll_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static ssize_t input_dev_get_poll_max(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 				      struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	struct input_dev *input = to_input_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return sprintf(buf, "%d\n", input->poller->poll_interval_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static DEVICE_ATTR(max, 0444, input_dev_get_poll_max, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static ssize_t input_dev_get_poll_min(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 				     struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	struct input_dev *input = to_input_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	return sprintf(buf, "%d\n", input->poller->poll_interval_min);
^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 DEVICE_ATTR(min, 0444, input_dev_get_poll_min, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static umode_t input_poller_attrs_visible(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 					  struct attribute *attr, int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	struct device *dev = kobj_to_dev(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	struct input_dev *input = to_input_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return input->poller ? attr->mode : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static struct attribute *input_poller_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	&dev_attr_poll.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	&dev_attr_max.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	&dev_attr_min.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct attribute_group input_poller_attribute_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	.is_visible	= input_poller_attrs_visible,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	.attrs		= input_poller_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) };