diff options
Diffstat (limited to 'arch/mips/lasat/picvue_proc.c')
| -rw-r--r-- | arch/mips/lasat/picvue_proc.c | 191 |
1 files changed, 191 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..9947c1525822 --- /dev/null +++ b/arch/mips/lasat/picvue_proc.c @@ -0,0 +1,191 @@ +/* + * 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, 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_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(KERN_WARNING "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(KERN_WARNING "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"); |