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Diffstat (limited to 'arch/mips/lasat/picvue_proc.c')
-rw-r--r--arch/mips/lasat/picvue_proc.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/mips/lasat/picvue_proc.c b/arch/mips/lasat/picvue_proc.c
new file mode 100644
index 000000000000..eaa2b4625124
--- /dev/null
+++ b/arch/mips/lasat/picvue_proc.c
@@ -0,0 +1,186 @@
+/*
+ * Picvue PVC160206 display driver
+ *
+ * Brian Murphy <brian.murphy@eicon.com>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+
+#include <linux/proc_fs.h>
+#include <linux/interrupt.h>
+
+#include <linux/timer.h>
+
+#include "picvue.h"
+
+static char pvc_lines[PVC_NLINES][PVC_LINELEN+1];
+static int pvc_linedata[PVC_NLINES];
+static struct proc_dir_entry *pvc_display_dir;
+static char *pvc_linename[PVC_NLINES] = {"line1", "line2"};
+#define DISPLAY_DIR_NAME "display"
+static int scroll_dir = 0, scroll_interval = 0;
+
+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_proc_read_line(char *page, char **start,
+ off_t off, int count,
+ int *eof, void *data)
+{
+ char *origpage = page;
+ int lineno = *(int *)data;
+
+ if (lineno < 0 || lineno > PVC_NLINES) {
+ printk("proc_read_line: invalid lineno %d\n", lineno);
+ return 0;
+ }
+
+ down(&pvc_sem);
+ page += sprintf(page, "%s\n", pvc_lines[lineno]);
+ up(&pvc_sem);
+
+ return page - origpage;
+}
+
+static int pvc_proc_write_line(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ int origcount = count;
+ int lineno = *(int *)data;
+
+ if (lineno < 0 || lineno > PVC_NLINES) {
+ printk("proc_write_line: invalid lineno %d\n", lineno);
+ return origcount;
+ }
+
+ if (count > PVC_LINELEN)
+ count = PVC_LINELEN;
+
+ if (buffer[count-1] == '\n')
+ count--;
+
+ down(&pvc_sem);
+ strncpy(pvc_lines[lineno], buffer, count);
+ pvc_lines[lineno][count] = '\0';
+ up(&pvc_sem);
+
+ tasklet_schedule(&pvc_display_tasklet);
+
+ return origcount;
+}
+
+static int pvc_proc_write_scroll(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ int origcount = count;
+ int cmd = simple_strtol(buffer, NULL, 10);
+
+ down(&pvc_sem);
+ 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);
+ }
+ up(&pvc_sem);
+
+ return origcount;
+}
+
+static int pvc_proc_read_scroll(char *page, char **start,
+ off_t off, int count,
+ int *eof, void *data)
+{
+ char *origpage = page;
+
+ down(&pvc_sem);
+ page += sprintf(page, "%d\n", scroll_dir * scroll_interval);
+ up(&pvc_sem);
+
+ return page - origpage;
+}
+
+
+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)
+{
+ int i;
+ for (i=0; i<PVC_NLINES; i++)
+ remove_proc_entry(pvc_linename[i], pvc_display_dir);
+ remove_proc_entry("scroll", pvc_display_dir);
+ remove_proc_entry(DISPLAY_DIR_NAME, NULL);
+
+ del_timer(&timer);
+}
+
+static int __init pvc_proc_init(void)
+{
+ struct proc_dir_entry *proc_entry;
+ int i;
+
+ pvc_display_dir = proc_mkdir(DISPLAY_DIR_NAME, NULL);
+ if (pvc_display_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 = create_proc_entry(pvc_linename[i], 0644, pvc_display_dir);
+ if (proc_entry == NULL)
+ goto error;
+ proc_entry->read_proc = pvc_proc_read_line;
+ proc_entry->write_proc = pvc_proc_write_line;
+ proc_entry->data = &pvc_linedata[i];
+ }
+ proc_entry = create_proc_entry("scroll", 0644, pvc_display_dir);
+ if (proc_entry == NULL)
+ goto error;
+ proc_entry->write_proc = pvc_proc_write_scroll;
+ proc_entry->read_proc = pvc_proc_read_scroll;
+
+ 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");