staging: panel: fix sparse warnings in lcd_write
This patch fixes two sparse warnings related to lcd_write : warning: incorrect type in argument 1 (different address spaces) warning: incorrect type in initializer (incompatible argument 2 (different address spaces)) lcd_write can be used from kernel space (in panel_lcd_print) or from user space. So we introduce the lcd_write_char function that will write a char to the device. We modify lcd_write and panel_lcd_print to use it. Finally we add __user annotation missing in lcd_write. Signed-off-by: Bastien Armand <armand.bastien@laposte.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bastien Armand
Greg Kroah-Hartman
parent
e112f89bcc
commit
70a8c3eb85
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@ -1217,111 +1217,113 @@ static inline int handle_lcd_special_code(void)
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return processed;
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}
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static ssize_t lcd_write(struct file *file,
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const char *buf, size_t count, loff_t *ppos)
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static void lcd_write_char(char c)
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{
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const char *tmp = buf;
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/* first, we'll test if we're in escape mode */
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if ((c != '\n') && lcd_escape_len >= 0) {
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/* yes, let's add this char to the buffer */
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lcd_escape[lcd_escape_len++] = c;
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lcd_escape[lcd_escape_len] = 0;
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} else {
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/* aborts any previous escape sequence */
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lcd_escape_len = -1;
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switch (c) {
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case LCD_ESCAPE_CHAR:
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/* start of an escape sequence */
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lcd_escape_len = 0;
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lcd_escape[lcd_escape_len] = 0;
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break;
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case '\b':
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/* go back one char and clear it */
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if (lcd_addr_x > 0) {
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/* check if we're not at the
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end of the line */
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if (lcd_addr_x < lcd_bwidth)
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/* back one char */
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lcd_write_cmd(0x10);
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lcd_addr_x--;
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}
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/* replace with a space */
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lcd_write_data(' ');
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/* back one char again */
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lcd_write_cmd(0x10);
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break;
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case '\014':
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/* quickly clear the display */
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lcd_clear_fast();
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break;
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case '\n':
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/* flush the remainder of the current line and
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go to the beginning of the next line */
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for (; lcd_addr_x < lcd_bwidth; lcd_addr_x++)
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lcd_write_data(' ');
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lcd_addr_x = 0;
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lcd_addr_y = (lcd_addr_y + 1) % lcd_height;
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lcd_gotoxy();
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break;
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case '\r':
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/* go to the beginning of the same line */
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lcd_addr_x = 0;
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lcd_gotoxy();
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break;
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case '\t':
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/* print a space instead of the tab */
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lcd_print(' ');
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break;
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default:
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/* simply print this char */
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lcd_print(c);
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break;
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}
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}
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/* now we'll see if we're in an escape mode and if the current
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escape sequence can be understood. */
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if (lcd_escape_len >= 2) {
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int processed = 0;
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if (!strcmp(lcd_escape, "[2J")) {
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/* clear the display */
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lcd_clear_fast();
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processed = 1;
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} else if (!strcmp(lcd_escape, "[H")) {
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/* cursor to home */
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lcd_addr_x = lcd_addr_y = 0;
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lcd_gotoxy();
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processed = 1;
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}
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/* codes starting with ^[[L */
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else if ((lcd_escape_len >= 3) &&
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(lcd_escape[0] == '[') &&
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(lcd_escape[1] == 'L')) {
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processed = handle_lcd_special_code();
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}
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/* LCD special escape codes */
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/* flush the escape sequence if it's been processed
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or if it is getting too long. */
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if (processed || (lcd_escape_len >= LCD_ESCAPE_LEN))
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lcd_escape_len = -1;
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} /* escape codes */
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}
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static ssize_t lcd_write(struct file *file,
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const char __user *buf, size_t count, loff_t *ppos)
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{
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const char __user *tmp = buf;
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char c;
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for (; count-- > 0; (ppos ? (*ppos)++ : 0), ++tmp) {
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for (; count-- > 0; (*ppos)++, tmp++) {
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if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
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/* let's be a little nice with other processes
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that need some CPU */
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schedule();
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if (ppos == NULL && file == NULL)
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/* let's not use get_user() from the kernel ! */
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c = *tmp;
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else if (get_user(c, tmp))
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if (get_user(c, buf))
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return -EFAULT;
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/* first, we'll test if we're in escape mode */
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if ((c != '\n') && lcd_escape_len >= 0) {
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/* yes, let's add this char to the buffer */
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lcd_escape[lcd_escape_len++] = c;
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lcd_escape[lcd_escape_len] = 0;
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} else {
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/* aborts any previous escape sequence */
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lcd_escape_len = -1;
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switch (c) {
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case LCD_ESCAPE_CHAR:
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/* start of an escape sequence */
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lcd_escape_len = 0;
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lcd_escape[lcd_escape_len] = 0;
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break;
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case '\b':
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/* go back one char and clear it */
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if (lcd_addr_x > 0) {
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/* check if we're not at the
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end of the line */
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if (lcd_addr_x < lcd_bwidth)
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/* back one char */
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lcd_write_cmd(0x10);
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lcd_addr_x--;
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}
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/* replace with a space */
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lcd_write_data(' ');
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/* back one char again */
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lcd_write_cmd(0x10);
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break;
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case '\014':
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/* quickly clear the display */
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lcd_clear_fast();
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break;
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case '\n':
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/* flush the remainder of the current line and
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go to the beginning of the next line */
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for (; lcd_addr_x < lcd_bwidth; lcd_addr_x++)
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lcd_write_data(' ');
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lcd_addr_x = 0;
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lcd_addr_y = (lcd_addr_y + 1) % lcd_height;
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lcd_gotoxy();
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break;
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case '\r':
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/* go to the beginning of the same line */
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lcd_addr_x = 0;
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lcd_gotoxy();
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break;
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case '\t':
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/* print a space instead of the tab */
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lcd_print(' ');
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break;
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default:
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/* simply print this char */
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lcd_print(c);
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break;
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}
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}
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/* now we'll see if we're in an escape mode and if the current
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escape sequence can be understood. */
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if (lcd_escape_len >= 2) {
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int processed = 0;
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if (!strcmp(lcd_escape, "[2J")) {
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/* clear the display */
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lcd_clear_fast();
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processed = 1;
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} else if (!strcmp(lcd_escape, "[H")) {
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/* cursor to home */
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lcd_addr_x = lcd_addr_y = 0;
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lcd_gotoxy();
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processed = 1;
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}
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/* codes starting with ^[[L */
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else if ((lcd_escape_len >= 3) &&
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(lcd_escape[0] == '[') &&
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(lcd_escape[1] == 'L')) {
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processed = handle_lcd_special_code();
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}
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/* LCD special escape codes */
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/* flush the escape sequence if it's been processed
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or if it is getting too long. */
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if (processed || (lcd_escape_len >= LCD_ESCAPE_LEN))
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lcd_escape_len = -1;
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} /* escape codes */
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lcd_write_char(c);
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}
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return tmp - buf;
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@ -1365,8 +1367,19 @@ static struct miscdevice lcd_dev = {
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/* public function usable from the kernel for any purpose */
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static void panel_lcd_print(const char *s)
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{
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if (lcd_enabled && lcd_initialized)
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lcd_write(NULL, s, strlen(s), NULL);
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const char *tmp = s;
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int count = strlen(s);
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if (lcd_enabled && lcd_initialized) {
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for (; count-- > 0; tmp++) {
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if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
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/* let's be a little nice with other processes
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that need some CPU */
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schedule();
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lcd_write_char(*tmp);
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}
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}
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}
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/* initialize the LCD driver */
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