1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * /proc interface for comedi 4 * 5 * COMEDI - Linux Control and Measurement Device Interface 6 * Copyright (C) 1998 David A. Schleef <ds@schleef.org> 7 */ 8 9 /* 10 * This is some serious bloatware. 11 * 12 * Taken from Dave A.'s PCL-711 driver, 'cuz I thought it 13 * was cool. 14 */ 15 16 #include <linux/comedi/comedidev.h> 17 #include "comedi_internal.h" 18 #include <linux/proc_fs.h> 19 #include <linux/seq_file.h> 20 21 static int comedi_read(struct seq_file *m, void *v) 22 { 23 int i; 24 int devices_q = 0; 25 struct comedi_driver *driv; 26 27 seq_printf(m, "comedi version " COMEDI_RELEASE "\nformat string: %s\n", 28 "\"%2d: %-20s %-20s %4d\", i, driver_name, board_name, n_subdevices"); 29 30 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { 31 struct comedi_device *dev = comedi_dev_get_from_minor(i); 32 33 if (!dev) 34 continue; 35 36 down_read(&dev->attach_lock); 37 if (dev->attached) { 38 devices_q = 1; 39 seq_printf(m, "%2d: %-20s %-20s %4d\n", 40 i, dev->driver->driver_name, 41 dev->board_name, dev->n_subdevices); 42 } 43 up_read(&dev->attach_lock); 44 comedi_dev_put(dev); 45 } 46 if (!devices_q) 47 seq_puts(m, "no devices\n"); 48 49 mutex_lock(&comedi_drivers_list_lock); 50 for (driv = comedi_drivers; driv; driv = driv->next) { 51 seq_printf(m, "%s:\n", driv->driver_name); 52 for (i = 0; i < driv->num_names; i++) 53 seq_printf(m, " %s\n", 54 *(char **)((char *)driv->board_name + 55 i * driv->offset)); 56 57 if (!driv->num_names) 58 seq_printf(m, " %s\n", driv->driver_name); 59 } 60 mutex_unlock(&comedi_drivers_list_lock); 61 62 return 0; 63 } 64 65 void __init comedi_proc_init(void) 66 { 67 if (!proc_create_single("comedi", 0444, NULL, comedi_read)) 68 pr_warn("comedi: unable to create proc entry\n"); 69 } 70 71 void comedi_proc_cleanup(void) 72 { 73 remove_proc_entry("comedi", NULL); 74 } 75