lineage_kernel_xcoverpro/drivers/misc/samsung/scsc/mx250_fm_test.c

144 lines
3.4 KiB
C
Executable File

/****************************************************************************
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd. All rights reserved.
*
****************************************************************************/
#include <linux/version.h>
#include <linux/slab.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <scsc/scsc_logring.h>
#include <scsc/scsc_mx.h>
#include "scsc_mx_impl.h"
/* char device entry declarations */
static dev_t mx250_fm_test_dev_t;
static struct class *mx250_fm_test_class;
static struct cdev *mx250_fm_test_cdev;
static int mx250_fm_test_dev_open(struct inode *inode, struct file *file)
{
return 0;
}
static int mx250_fm_test_dev_release(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t mx250_fm_test_dev_write(struct file *file, const char *data, size_t len, loff_t *offset)
{
unsigned long count;
char str[20]; /* One value and carry return */
long val = 0;
struct wlbt_fm_params params;
int r;
count = copy_from_user(str, data, len);
str[sizeof(str) - 1] = 0;
if (len < sizeof(str))
str[len - 1] = 0;
r = kstrtol(str, 0, &val);
if (r) {
SCSC_TAG_ERR(FM_TEST, "parse error %d, l=%zd\n", r, len);
goto error;
}
if (val == 1)
mx250_fm_request();
else if (val == 0)
mx250_fm_release();
else {
/* All other values are frequency info */
params.freq = (u32)val;
SCSC_TAG_INFO(FM_TEST, "FM freq=%u\n", params.freq);
mx250_fm_set_params(&params);
}
error:
return len;
}
static ssize_t mx250_fm_test_dev_read(struct file *filp, char *buffer, size_t length, loff_t *offset)
{
return length;
}
static const struct file_operations mx250_fm_test_dev_fops = {
.owner = THIS_MODULE,
.open = mx250_fm_test_dev_open,
.read = mx250_fm_test_dev_read,
.write = mx250_fm_test_dev_write,
.release = mx250_fm_test_dev_release,
};
/* FM service driver registration */
void mx250_fm_test_init(void)
{
int ret;
SCSC_TAG_INFO(FM_TEST, "Registering mx250 TEST\n");
ret = alloc_chrdev_region(&mx250_fm_test_dev_t, 0, 1, "mx250_fm_test-cdev");
if (ret < 0) {
SCSC_TAG_ERR(FM_TEST, "failed to alloc chrdev region\n");
goto fail_alloc_chrdev_region;
}
mx250_fm_test_cdev = cdev_alloc();
if (!mx250_fm_test_cdev) {
ret = -ENOMEM;
SCSC_TAG_ERR(FM_TEST, "failed to alloc cdev\n");
goto fail_alloc_cdev;
}
cdev_init(mx250_fm_test_cdev, &mx250_fm_test_dev_fops);
ret = cdev_add(mx250_fm_test_cdev, mx250_fm_test_dev_t, 1);
if (ret < 0) {
SCSC_TAG_ERR(FM_TEST, "failed to add cdev\n");
goto fail_add_cdev;
}
mx250_fm_test_class = class_create(THIS_MODULE, "mx250_fm_test");
if (!mx250_fm_test_class) {
ret = -EEXIST;
SCSC_TAG_ERR(FM_TEST, "failed to create class\n");
goto fail_create_class;
}
if (!device_create(mx250_fm_test_class, NULL, mx250_fm_test_dev_t, NULL, "mx250_fm_test_%d",
MINOR(mx250_fm_test_dev_t))) {
ret = -EINVAL;
SCSC_TAG_ERR(FM_TEST, "failed to create device\n");
goto fail_create_device;
}
return;
fail_create_device:
class_destroy(mx250_fm_test_class);
fail_create_class:
cdev_del(mx250_fm_test_cdev);
fail_add_cdev:
fail_alloc_cdev:
unregister_chrdev_region(mx250_fm_test_dev_t, 1);
fail_alloc_chrdev_region:
return;
}
void mx250_fm_test_exit(void)
{
device_destroy(mx250_fm_test_class, mx250_fm_test_dev_t);
class_destroy(mx250_fm_test_class);
cdev_del(mx250_fm_test_cdev);
unregister_chrdev_region(mx250_fm_test_dev_t, 1);
}