[PATCH v2 5/9] staging: panel: Start making module params read-only

Mariusz Gorski
2014-11-19T20:47:21Z

Start decoupling module params from the actual device state,
both for lcd and keypad, by keeping the params read-only
and moving the device state to related structs.

Signed-off-by: Mariusz Gorski <marius.gorski@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
---
drivers/staging/panel/panel.c | 35 +++++++++++++++++++++--------------
1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index 5288990..7e5bb53 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -212,6 +212,10 @@ static pmask_t phys_prev;
static char inputs_stable;

/* these variables are specific to the keypad */
+static struct {
+ bool enabled;
+} keypad;
+
static char keypad_buffer[KEYPAD_BUFFER];
static int keypad_buflen;
static int keypad_start;
@@ -219,6 +223,9 @@ static char keypressed;
static wait_queue_head_t keypad_read_wait;

/* lcd-specific variables */
+static struct {
+ bool enabled;
+} lcd;

/* contains the LCD config state */
static unsigned long int lcd_flags;
@@ -1393,7 +1400,7 @@ static void panel_lcd_print(const char *s)
const char *tmp = s;
int count = strlen(s);

- if (lcd_enabled && lcd_initialized) {
+ if (lcd.enabled && lcd_initialized) {
for (; count-- > 0; tmp++) {
if (!in_interrupt() && (((count + 1) & 0x1f) == 0))
/* let's be a little nice with other processes
@@ -1923,7 +1930,7 @@ static void panel_process_inputs(void)

static void panel_scan_timer(void)
{
- if (keypad_enabled && keypad_initialized) {
+ if (keypad.enabled && keypad_initialized) {
if (spin_trylock_irq(&pprt_lock)) {
phys_scan_contacts();

@@ -1935,7 +1942,7 @@ static void panel_scan_timer(void)
panel_process_inputs();
}

- if (lcd_enabled && lcd_initialized) {
+ if (lcd.enabled && lcd_initialized) {
if (keypressed) {
if (light_tempo == 0 && ((lcd_flags & LCD_FLAG_L) == 0))
lcd_backlight(1);
@@ -2114,7 +2121,7 @@ static void keypad_init(void)
static int panel_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
- if (lcd_enabled && lcd_initialized) {
+ if (lcd.enabled && lcd_initialized) {
switch (code) {
case SYS_DOWN:
panel_lcd_print
@@ -2170,13 +2177,13 @@ static void panel_attach(struct parport *port)
/* must init LCD first, just in case an IRQ from the keypad is
* generated at keypad init
*/
- if (lcd_enabled) {
+ if (lcd.enabled) {
lcd_init();
if (misc_register(&lcd_dev))
goto err_unreg_device;
}

- if (keypad_enabled) {
+ if (keypad.enabled) {
keypad_init();
if (misc_register(&keypad_dev))
goto err_lcd_unreg;
@@ -2184,7 +2191,7 @@ static void panel_attach(struct parport *port)
return;

err_lcd_unreg:
- if (lcd_enabled)
+ if (lcd.enabled)
misc_deregister(&lcd_dev);
err_unreg_device:
parport_unregister_device(pprt);
@@ -2202,12 +2209,12 @@ static void panel_detach(struct parport *port)
return;
}

- if (keypad_enabled && keypad_initialized) {
+ if (keypad.enabled && keypad_initialized) {
misc_deregister(&keypad_dev);
keypad_initialized = 0;
}

- if (lcd_enabled && lcd_initialized) {
+ if (lcd.enabled && lcd_initialized) {
misc_deregister(&lcd_dev);
lcd_initialized = 0;
}
@@ -2283,8 +2290,8 @@ static int __init panel_init_module(void)
break;
}

- lcd_enabled = (lcd_type > 0);
- keypad_enabled = (keypad_type > 0);
+ lcd.enabled = (lcd_type > 0);
+ keypad.enabled = (keypad_type > 0);

switch (keypad_type) {
case KEYPAD_TYPE_OLD:
@@ -2309,7 +2316,7 @@ static int __init panel_init_module(void)
return -EIO;
}

- if (!lcd_enabled && !keypad_enabled) {
+ if (!lcd.enabled && !keypad.enabled) {
/* no device enabled, let's release the parport */
if (pprt) {
parport_release(pprt);
@@ -2344,12 +2351,12 @@ static void __exit panel_cleanup_module(void)
del_timer_sync(&scan_timer);

if (pprt != NULL) {
- if (keypad_enabled) {
+ if (keypad.enabled) {
misc_deregister(&keypad_dev);
keypad_initialized = 0;
}

- if (lcd_enabled) {
+ if (lcd.enabled) {
panel_lcd_print("\x0cLCD driver " PANEL_VERSION
"\nunloaded.\x1b[Lc\x1b[Lb\x1b[L-");
misc_deregister(&lcd_dev);
--
2.1.3