314 lines
7.0 KiB
C
Executable File
314 lines
7.0 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Input driver for resistor ladder connected on ADC
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*
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* Copyright (c) 2016 Alexandre Belloni
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*/
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#include <linux/err.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/types.h>
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#include <linux/input.h>
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#include <linux/input-polldev.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/proc_fs.h>
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#include <linux/version.h>
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static struct proc_dir_entry *root_entry_adckey;
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static int g_key_counter = 0;
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static int adckey_status = 0;
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static int adckey_open(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static ssize_t adckey_write(struct file *file, const char *buffer,size_t count, loff_t *data)
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{
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adckey_status = 1;
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return count;
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}
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static ssize_t adckey_read(struct file *file, char __user * buffer, size_t count, loff_t *data)
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{
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//char adc = 0;
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int len = 0;
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char s[10] = {0};
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if(*data)
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return 0;
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// printk("adckey_status %d\n",adckey_status);
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len = sprintf(s+len, "%d\n",adckey_status);
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return simple_read_from_buffer(buffer, count, data, s, 2);
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}
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
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static const struct proc_ops adckey_ops = {
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.proc_open = adckey_open,
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.proc_write = adckey_write,
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.proc_read = adckey_read,
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};
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#else
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static const struct file_operations adckey_ops = {
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.owner = THIS_MODULE,
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.open = adckey_open,
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.write = adckey_write,
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.read = adckey_read,
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};
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#endif
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struct adc_keys_button {
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u32 voltage;
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u32 keycode;
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};
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struct adc_keys_state {
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struct iio_channel *channel;
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u32 num_keys;
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u32 last_key;
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u32 keyup_voltage;
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const struct adc_keys_button *map;
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};
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//---------rpdzkj --
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static int usb_mode_change(void)
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{
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int fd;
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static char *mode_state = "host";
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mm_segment_t old_fs=get_fs();
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set_fs(KERNEL_DS);
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fd=do_sys_open(AT_FDCWD,"/sys/kernel/debug/usb/fc000000.usb/mode",O_CREAT|O_RDWR, 0666);
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if(fd>=0)
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{
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int i;
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char after_buff[32]="0";
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char before_buff[32]="0";
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ksys_read(fd,before_buff,sizeof(before_buff));
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if (!strncmp(before_buff,"host",4))
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mode_state = "device";
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else
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mode_state = "host";
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for ( i = 0; i < 3; i++){
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ksys_write(fd,mode_state,sizeof(mode_state));
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msleep(1000);
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ksys_read(fd,after_buff,sizeof(after_buff));
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if (!strncmp(after_buff, before_buff, 4))
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break;
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}
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ksys_close(fd);
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}
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set_fs(old_fs);
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return 0;
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}
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//---------
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static void adc_keys_poll(struct input_dev *input)
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{
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struct adc_keys_state *st = input_get_drvdata(input);
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int i, value, ret;
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u32 diff, closest = 0xffffffff;
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int keycode = 0;
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ret = iio_read_channel_processed(st->channel, &value);
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if (unlikely(ret < 0)) {
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/* Forcibly release key if any was pressed */
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value = st->keyup_voltage;
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} else {
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for (i = 0; i < st->num_keys; i++) {
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diff = abs(st->map[i].voltage - value);
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if (diff < closest) {
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closest = diff;
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keycode = st->map[i].keycode;
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}
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}
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}
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if (abs(st->keyup_voltage - value) < closest)
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keycode = 0;
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if (st->last_key && st->last_key != keycode)
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input_report_key(input, st->last_key, 0);
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if (keycode)
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input_report_key(input, keycode, 1);
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if (keycode == KEY_VOLUMEUP || keycode == KEY_VOLUMEDOWN)
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{
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g_key_counter++;
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if (g_key_counter == 20)
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usb_mode_change();
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else if (g_key_counter == 60)
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adckey_status = 1;
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}
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else
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{
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g_key_counter = 0;
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}
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input_sync(input);
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st->last_key = keycode;
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}
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static int adc_keys_load_keymap(struct device *dev, struct adc_keys_state *st)
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{
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struct adc_keys_button *map;
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struct fwnode_handle *child;
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int i;
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st->num_keys = device_get_child_node_count(dev);
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if (st->num_keys == 0) {
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dev_err(dev, "keymap is missing\n");
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return -EINVAL;
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}
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map = devm_kmalloc_array(dev, st->num_keys, sizeof(*map), GFP_KERNEL);
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if (!map)
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return -ENOMEM;
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i = 0;
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device_for_each_child_node(dev, child) {
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if (fwnode_property_read_u32(child, "press-threshold-microvolt",
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&map[i].voltage)) {
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dev_err(dev, "Key with invalid or missing voltage\n");
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fwnode_handle_put(child);
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return -EINVAL;
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}
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map[i].voltage /= 1000;
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if (fwnode_property_read_u32(child, "linux,code",
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&map[i].keycode)) {
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dev_err(dev, "Key with invalid or missing linux,code\n");
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fwnode_handle_put(child);
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return -EINVAL;
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}
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i++;
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}
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st->map = map;
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return 0;
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}
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static int adc_keys_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct adc_keys_state *st;
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struct input_dev *input;
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enum iio_chan_type type;
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int i, value;
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int error;
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st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
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if (!st)
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return -ENOMEM;
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st->channel = devm_iio_channel_get(dev, "buttons");
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if (IS_ERR(st->channel))
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return PTR_ERR(st->channel);
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if (!st->channel->indio_dev)
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return -ENXIO;
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error = iio_get_channel_type(st->channel, &type);
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if (error < 0)
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return error;
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if (type != IIO_VOLTAGE) {
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dev_err(dev, "Incompatible channel type %d\n", type);
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return -EINVAL;
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}
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if (device_property_read_u32(dev, "keyup-threshold-microvolt",
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&st->keyup_voltage)) {
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dev_err(dev, "Invalid or missing keyup voltage\n");
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return -EINVAL;
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}
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st->keyup_voltage /= 1000;
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error = adc_keys_load_keymap(dev, st);
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if (error)
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return error;
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input = devm_input_allocate_device(dev);
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if (!input) {
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dev_err(dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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input_set_drvdata(input, st);
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input->name = pdev->name;
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input->phys = "adc-keys/input0";
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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__set_bit(EV_KEY, input->evbit);
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for (i = 0; i < st->num_keys; i++)
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__set_bit(st->map[i].keycode, input->keybit);
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if (device_property_read_bool(dev, "autorepeat"))
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__set_bit(EV_REP, input->evbit);
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error = input_setup_polling(input, adc_keys_poll);
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if (error) {
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dev_err(dev, "Unable to set up polling: %d\n", error);
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return error;
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}
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if (!device_property_read_u32(dev, "poll-interval", &value))
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input_set_poll_interval(input, value);
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error = input_register_device(input);
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if (error) {
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dev_err(dev, "Unable to register input device: %d\n", error);
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return error;
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}
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root_entry_adckey = proc_mkdir("adckey", NULL);
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proc_create("status", 0666 , root_entry_adckey , &adckey_ops);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id adc_keys_of_match[] = {
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{ .compatible = "adc-keys", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adc_keys_of_match);
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#endif
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static struct platform_driver __refdata adc_keys_driver = {
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.driver = {
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.name = "adc_keys",
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.of_match_table = of_match_ptr(adc_keys_of_match),
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},
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.probe = adc_keys_probe,
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};
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module_platform_driver(adc_keys_driver);
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MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
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MODULE_DESCRIPTION("Input driver for resistor ladder connected on ADC");
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MODULE_LICENSE("GPL v2");
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