[deliverable/linux.git] / arch / mips / lasat / picvue_proc.c

/*
 * Picvue PVC160206 display driver
 *
 * Brian Murphy <brian.murphy@eicon.com>
 *
 */
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>

#include <linux/timer.h>
#include <linux/mutex.h>

#include "picvue.h"

static DEFINE_MUTEX(pvc_mutex);
static char pvc_lines[PVC_NLINES][PVC_LINELEN+1];
static int pvc_linedata[PVC_NLINES];
static char *pvc_linename[PVC_NLINES] = {"line1", "line2"};
#define DISPLAY_DIR_NAME "display"
static int scroll_dir, scroll_interval;

static struct timer_list timer;

static void pvc_display(unsigned long data)
{
	int i;

	pvc_clear();
	for (i = 0; i < PVC_NLINES; i++)
		pvc_write_string(pvc_lines[i], 0, i);
}

static DECLARE_TASKLET(pvc_display_tasklet, &pvc_display, 0);

static int pvc_line_proc_show(struct seq_file *m, void *v)
{
	int lineno = *(int *)m->private;

	if (lineno < 0 || lineno > PVC_NLINES) {
		printk(KERN_WARNING "proc_read_line: invalid lineno %d\n", lineno);
		return 0;
	}

	mutex_lock(&pvc_mutex);
	seq_printf(m, "%s\n", pvc_lines[lineno]);
	mutex_unlock(&pvc_mutex);

	return 0;
}

static int pvc_line_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pvc_line_proc_show, PDE_DATA(inode));
}

static ssize_t pvc_line_proc_write(struct file *file, const char __user *buf,
				   size_t count, loff_t *pos)
{
	int lineno = *(int *)PDE_DATA(file_inode(file));
	char kbuf[PVC_LINELEN];
	size_t len;

	BUG_ON(lineno < 0 || lineno > PVC_NLINES);

	len = min(count, sizeof(kbuf) - 1);
	if (copy_from_user(kbuf, buf, len))
		return -EFAULT;
	kbuf[len] = '\0';

	if (len > 0 && kbuf[len - 1] == '\n')
		len--;

	mutex_lock(&pvc_mutex);
	strncpy(pvc_lines[lineno], kbuf, len);
	pvc_lines[lineno][len] = '\0';
	mutex_unlock(&pvc_mutex);

	tasklet_schedule(&pvc_display_tasklet);

	return count;
}

static const struct file_operations pvc_line_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pvc_line_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= pvc_line_proc_write,
};

static ssize_t pvc_scroll_proc_write(struct file *file, const char __user *buf,
				     size_t count, loff_t *pos)
{
	char kbuf[42];
	size_t len;
	int cmd;

	len = min(count, sizeof(kbuf) - 1);
	if (copy_from_user(kbuf, buf, len))
		return -EFAULT;
	kbuf[len] = '\0';

	cmd = simple_strtol(kbuf, NULL, 10);

	mutex_lock(&pvc_mutex);
	if (scroll_interval != 0)
		del_timer(&timer);

	if (cmd == 0) {
		scroll_dir = 0;
		scroll_interval = 0;
	} else {
		if (cmd < 0) {
			scroll_dir = -1;
			scroll_interval = -cmd;
		} else {
			scroll_dir = 1;
			scroll_interval = cmd;
		}
		add_timer(&timer);
	}
	mutex_unlock(&pvc_mutex);

	return count;
}

static int pvc_scroll_proc_show(struct seq_file *m, void *v)
{
	mutex_lock(&pvc_mutex);
	seq_printf(m, "%d\n", scroll_dir * scroll_interval);
	mutex_unlock(&pvc_mutex);

	return 0;
}

static int pvc_scroll_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pvc_scroll_proc_show, NULL);
}

static const struct file_operations pvc_scroll_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pvc_scroll_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= pvc_scroll_proc_write,
};

void pvc_proc_timerfunc(unsigned long data)
{
	if (scroll_dir < 0)
		pvc_move(DISPLAY|RIGHT);
	else if (scroll_dir > 0)
		pvc_move(DISPLAY|LEFT);

	timer.expires = jiffies + scroll_interval;
	add_timer(&timer);
}

static void pvc_proc_cleanup(void)
{
	remove_proc_subtree(DISPLAY_DIR_NAME, NULL);
	del_timer_sync(&timer);
}

static int __init pvc_proc_init(void)
{
	struct proc_dir_entry *dir, *proc_entry;
	int i;

	dir = proc_mkdir(DISPLAY_DIR_NAME, NULL);
	if (dir == NULL)
		goto error;

	for (i = 0; i < PVC_NLINES; i++) {
		strcpy(pvc_lines[i], "");
		pvc_linedata[i] = i;
	}
	for (i = 0; i < PVC_NLINES; i++) {
		proc_entry = proc_create_data(pvc_linename[i], 0644, dir,
					&pvc_line_proc_fops, &pvc_linedata[i]);
		if (proc_entry == NULL)
			goto error;
	}
	proc_entry = proc_create("scroll", 0644, dir,
				 &pvc_scroll_proc_fops);
	if (proc_entry == NULL)
		goto error;

	init_timer(&timer);
	timer.function = pvc_proc_timerfunc;

	return 0;
error:
	pvc_proc_cleanup();
	return -ENOMEM;
}

module_init(pvc_proc_init);
module_exit(pvc_proc_cleanup);
MODULE_LICENSE("GPL");
Commit	Line	Data
1f21d2bd BM	1	/*
	2	* Picvue PVC160206 display driver
	3	*
	4	* Brian Murphy <brian.murphy@eicon.com>
	5	*
	6	*/
c0b4abdd	7	#include <linux/bug.h>
1f21d2bd BM	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/errno.h>
	12
	13	#include <linux/proc_fs.h>
c0b4abdd	14	#include <linux/seq_file.h>
1f21d2bd BM	15	#include <linux/interrupt.h>
	16
	17	#include <linux/timer.h>
8a39c520	18	#include <linux/mutex.h>
1f21d2bd BM	19
	20	#include "picvue.h"
	21
8a39c520	22	static DEFINE_MUTEX(pvc_mutex);
1f21d2bd BM	23	static char pvc_lines[PVC_NLINES][PVC_LINELEN+1];
1f21d2bd BM	24	static int pvc_linedata[PVC_NLINES];
1f21d2bd BM	25	static char *pvc_linename[PVC_NLINES] = {"line1", "line2"};
	26	#define DISPLAY_DIR_NAME "display"
	27	static int scroll_dir, scroll_interval;
	28
	29	static struct timer_list timer;
	30
	31	static void pvc_display(unsigned long data)
	32	{
	33	int i;
	34
	35	pvc_clear();
	36	for (i = 0; i < PVC_NLINES; i++)
	37	pvc_write_string(pvc_lines[i], 0, i);
	38	}
	39
	40	static DECLARE_TASKLET(pvc_display_tasklet, &pvc_display, 0);
	41
c0b4abdd	42	static int pvc_line_proc_show(struct seq_file m, void v)
1f21d2bd	43	{
c0b4abdd	44	int lineno = (int )m->private;
1f21d2bd BM	45
	46	if (lineno < 0 \|\| lineno > PVC_NLINES) {
	47	printk(KERN_WARNING "proc_read_line: invalid lineno %d\n", lineno);
	48	return 0;
	49	}
	50
8a39c520	51	mutex_lock(&pvc_mutex);
c0b4abdd	52	seq_printf(m, "%s\n", pvc_lines[lineno]);
8a39c520	53	mutex_unlock(&pvc_mutex);
1f21d2bd	54
c0b4abdd	55	return 0;
1f21d2bd BM	56	}
1f21d2bd BM	57
c0b4abdd	58	static int pvc_line_proc_open(struct inode inode, struct file file)
1f21d2bd	59	{
d9dda78b	60	return single_open(file, pvc_line_proc_show, PDE_DATA(inode));
c0b4abdd	61	}
1f21d2bd	62
c0b4abdd AD	63	static ssize_t pvc_line_proc_write(struct file file, const char __user buf,
	64	size_t count, loff_t *pos)
	65	{
d9dda78b	66	int lineno = (int )PDE_DATA(file_inode(file));
c0b4abdd AD	67	char kbuf[PVC_LINELEN];
	68	size_t len;
	69
	70	BUG_ON(lineno < 0 \|\| lineno > PVC_NLINES);
1f21d2bd	71
c0b4abdd AD	72	len = min(count, sizeof(kbuf) - 1);
	73	if (copy_from_user(kbuf, buf, len))
	74	return -EFAULT;
	75	kbuf[len] = '\0';
1f21d2bd	76
c0b4abdd AD	77	if (len > 0 && kbuf[len - 1] == '\n')
c0b4abdd AD	78	len--;
1f21d2bd	79
8a39c520	80	mutex_lock(&pvc_mutex);
c0b4abdd AD	81	strncpy(pvc_lines[lineno], kbuf, len);
c0b4abdd AD	82	pvc_lines[lineno][len] = '\0';
8a39c520	83	mutex_unlock(&pvc_mutex);
1f21d2bd BM	84
	85	tasklet_schedule(&pvc_display_tasklet);
	86
c0b4abdd	87	return count;
1f21d2bd BM	88	}
1f21d2bd BM	89
c0b4abdd AD	90	static const struct file_operations pvc_line_proc_fops = {
	91	.owner = THIS_MODULE,
	92	.open = pvc_line_proc_open,
	93	.read = seq_read,
	94	.llseek = seq_lseek,
	95	.release = single_release,
	96	.write = pvc_line_proc_write,
	97	};
	98
	99	static ssize_t pvc_scroll_proc_write(struct file file, const char __user buf,
	100	size_t count, loff_t *pos)
1f21d2bd	101	{
c0b4abdd AD	102	char kbuf[42];
	103	size_t len;
	104	int cmd;
	105
	106	len = min(count, sizeof(kbuf) - 1);
	107	if (copy_from_user(kbuf, buf, len))
	108	return -EFAULT;
	109	kbuf[len] = '\0';
	110
	111	cmd = simple_strtol(kbuf, NULL, 10);
1f21d2bd	112
8a39c520	113	mutex_lock(&pvc_mutex);
1f21d2bd BM	114	if (scroll_interval != 0)
	115	del_timer(&timer);
	116
	117	if (cmd == 0) {
	118	scroll_dir = 0;
	119	scroll_interval = 0;
	120	} else {
	121	if (cmd < 0) {
	122	scroll_dir = -1;
	123	scroll_interval = -cmd;
	124	} else {
	125	scroll_dir = 1;
	126	scroll_interval = cmd;
	127	}
	128	add_timer(&timer);
	129	}
8a39c520	130	mutex_unlock(&pvc_mutex);
1f21d2bd	131
c0b4abdd	132	return count;
1f21d2bd BM	133	}
1f21d2bd BM	134
c0b4abdd	135	static int pvc_scroll_proc_show(struct seq_file m, void v)
1f21d2bd	136	{
8a39c520	137	mutex_lock(&pvc_mutex);
c0b4abdd	138	seq_printf(m, "%d\n", scroll_dir * scroll_interval);
8a39c520	139	mutex_unlock(&pvc_mutex);
1f21d2bd	140
c0b4abdd	141	return 0;
1f21d2bd BM	142	}
1f21d2bd BM	143
c0b4abdd AD	144	static int pvc_scroll_proc_open(struct inode inode, struct file file)
	145	{
	146	return single_open(file, pvc_scroll_proc_show, NULL);
	147	}
	148
	149	static const struct file_operations pvc_scroll_proc_fops = {
	150	.owner = THIS_MODULE,
	151	.open = pvc_scroll_proc_open,
	152	.read = seq_read,
	153	.llseek = seq_lseek,
	154	.release = single_release,
	155	.write = pvc_scroll_proc_write,
	156	};
1f21d2bd BM	157
	158	void pvc_proc_timerfunc(unsigned long data)
	159	{
	160	if (scroll_dir < 0)
	161	pvc_move(DISPLAY\|RIGHT);
	162	else if (scroll_dir > 0)
	163	pvc_move(DISPLAY\|LEFT);
	164
	165	timer.expires = jiffies + scroll_interval;
	166	add_timer(&timer);
	167	}
	168
	169	static void pvc_proc_cleanup(void)
	170	{
c62432b4	171	remove_proc_subtree(DISPLAY_DIR_NAME, NULL);
49992cb1	172	del_timer_sync(&timer);
1f21d2bd BM	173	}
	174
	175	static int __init pvc_proc_init(void)
	176	{
c62432b4	177	struct proc_dir_entry dir, proc_entry;
1f21d2bd BM	178	int i;
1f21d2bd BM	179
c62432b4 AV	180	dir = proc_mkdir(DISPLAY_DIR_NAME, NULL);
c62432b4 AV	181	if (dir == NULL)
1f21d2bd BM	182	goto error;
	183
	184	for (i = 0; i < PVC_NLINES; i++) {
	185	strcpy(pvc_lines[i], "");
	186	pvc_linedata[i] = i;
	187	}
	188	for (i = 0; i < PVC_NLINES; i++) {
c62432b4	189	proc_entry = proc_create_data(pvc_linename[i], 0644, dir,
c0b4abdd	190	&pvc_line_proc_fops, &pvc_linedata[i]);
1f21d2bd BM	191	if (proc_entry == NULL)
1f21d2bd BM	192	goto error;
1f21d2bd	193	}
c62432b4	194	proc_entry = proc_create("scroll", 0644, dir,
c0b4abdd	195	&pvc_scroll_proc_fops);
1f21d2bd BM	196	if (proc_entry == NULL)
	197	goto error;
	198
1f21d2bd BM	199	init_timer(&timer);
	200	timer.function = pvc_proc_timerfunc;
	201
	202	return 0;
	203	error:
	204	pvc_proc_cleanup();
	205	return -ENOMEM;
	206	}
	207
	208	module_init(pvc_proc_init);
	209	module_exit(pvc_proc_cleanup);
	210	MODULE_LICENSE("GPL");