v4.19.13 snapshot.
diff --git a/arch/mips/lasat/picvue_proc.c b/arch/mips/lasat/picvue_proc.c
new file mode 100644
index 0000000..5d89e1e
--- /dev/null
+++ b/arch/mips/lasat/picvue_proc.c
@@ -0,0 +1,210 @@
+/*
+ * 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 <linux/uaccess.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(struct timer_list *unused)
+{
+ 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;
+
+ timer_setup(&timer, pvc_proc_timerfunc, 0);
+
+ return 0;
+error:
+ pvc_proc_cleanup();
+ return -ENOMEM;
+}
+
+module_init(pvc_proc_init);
+module_exit(pvc_proc_cleanup);
+MODULE_LICENSE("GPL");