[PATCH v2 6/9] staging: panel: Make two more module params read-only

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

Make keypad_type and lcd_type module params read-only.
This step also starts making it more clear what is
the precedence of device params coming from different
sources (device profile, runtime module param values etc).

Signed-off-by: Mariusz Gorski <marius.gorski@gmail.com>
---
drivers/staging/panel/panel.c | 71 ++++++++++++++++++++++---------------------
1 file changed, 37 insertions(+), 34 deletions(-)

diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index 7e5bb53..5868a28 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -227,6 +227,9 @@ static struct {
bool enabled;
} lcd;

+/* Needed only for init */
+static int selected_lcd_type = NOT_SET;
+
/* contains the LCD config state */
static unsigned long int lcd_flags;
/* contains the LCD X offset */
@@ -1415,7 +1418,7 @@ static void panel_lcd_print(const char *s)
/* initialize the LCD driver */
static void lcd_init(void)
{
- switch (lcd_type) {
+ switch (selected_lcd_type) {
case LCD_TYPE_OLD:
/* parallel mode, 8 bits */
if (lcd_proto == NOT_SET)
@@ -2233,28 +2236,21 @@ static struct parport_driver panel_driver = {
/* init function */
static int __init panel_init_module(void)
{
- /* for backwards compatibility */
- if (keypad_type == NOT_SET)
- keypad_type = keypad_enabled;
-
- if (lcd_type == NOT_SET)
- lcd_type = lcd_enabled;
+ int selected_keypad_type = NOT_SET;

/* take care of an eventual profile */
switch (profile) {
case PANEL_PROFILE_CUSTOM:
/* custom profile */
- if (keypad_type == NOT_SET)
- keypad_type = DEFAULT_KEYPAD_TYPE;
- if (lcd_type == NOT_SET)
- lcd_type = DEFAULT_LCD_TYPE;
+ selected_keypad_type = DEFAULT_KEYPAD_TYPE;
+ selected_lcd_type = DEFAULT_LCD_TYPE;
break;
case PANEL_PROFILE_OLD:
/* 8 bits, 2*16, old keypad */
- if (keypad_type == NOT_SET)
- keypad_type = KEYPAD_TYPE_OLD;
- if (lcd_type == NOT_SET)
- lcd_type = LCD_TYPE_OLD;
+ selected_keypad_type = KEYPAD_TYPE_OLD;
+ selected_lcd_type = LCD_TYPE_OLD;
+
+ /* TODO: This two are a little hacky, sort it out later */
if (lcd_width == NOT_SET)
lcd_width = 16;
if (lcd_hwidth == NOT_SET)
@@ -2262,38 +2258,45 @@ static int __init panel_init_module(void)
break;
case PANEL_PROFILE_NEW:
/* serial, 2*16, new keypad */
- if (keypad_type == NOT_SET)
- keypad_type = KEYPAD_TYPE_NEW;
- if (lcd_type == NOT_SET)
- lcd_type = LCD_TYPE_KS0074;
+ selected_keypad_type = KEYPAD_TYPE_NEW;
+ selected_lcd_type = LCD_TYPE_KS0074;
break;
case PANEL_PROFILE_HANTRONIX:
/* 8 bits, 2*16 hantronix-like, no keypad */
- if (keypad_type == NOT_SET)
- keypad_type = KEYPAD_TYPE_NONE;
- if (lcd_type == NOT_SET)
- lcd_type = LCD_TYPE_HANTRONIX;
+ selected_keypad_type = KEYPAD_TYPE_NONE;
+ selected_lcd_type = LCD_TYPE_HANTRONIX;
break;
case PANEL_PROFILE_NEXCOM:
/* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
- if (keypad_type == NOT_SET)
- keypad_type = KEYPAD_TYPE_NEXCOM;
- if (lcd_type == NOT_SET)
- lcd_type = LCD_TYPE_NEXCOM;
+ selected_keypad_type = KEYPAD_TYPE_NEXCOM;
+ selected_lcd_type = LCD_TYPE_NEXCOM;
break;
case PANEL_PROFILE_LARGE:
/* 8 bits, 2*40, old keypad */
- if (keypad_type == NOT_SET)
- keypad_type = KEYPAD_TYPE_OLD;
- if (lcd_type == NOT_SET)
- lcd_type = LCD_TYPE_OLD;
+ selected_keypad_type = KEYPAD_TYPE_OLD;
+ selected_lcd_type = LCD_TYPE_OLD;
break;
}

- lcd.enabled = (lcd_type > 0);
- keypad.enabled = (keypad_type > 0);
+ /*
+ * Overwrite selection with module param values (both keypad and lcd),
+ * where the deprecated params have lower prio.
+ */
+ if (keypad_enabled > -1)
+ selected_keypad_type = keypad_enabled;
+ if (keypad_type > -1)
+ selected_keypad_type = keypad_type;
+
+ keypad.enabled = (selected_keypad_type > 0);
+
+ if (lcd_enabled > -1)
+ selected_lcd_type = lcd_enabled;
+ if (lcd_type > -1)
+ selected_lcd_type = lcd_type;
+
+ lcd.enabled = (selected_lcd_type > 0);

- switch (keypad_type) {
+ switch (selected_keypad_type) {
case KEYPAD_TYPE_OLD:
keypad_profile = old_keypad_profile;
break;
--
2.1.3