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Date: Thu, 11 Feb 2016 13:29:23 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, linux-kernel@...r.kernel.org,
Daniel Chromik <daniel.chromik@...nam.cz>,
Jiri Slaby <jslaby@...e.cz>, Willy Tarreau <willy@...roxy.com>,
Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Subject: [PATCH] misc: panel, convert struct to bitmap
From: Daniel Chromik <daniel.chromik@...nam.cz>
There is an anonymous struct which is actually used as a bitmap. So
convert the struct to a bitmap and change code accordingly where
needed.
This also allows for a cleanup of set_data_bits and set_ctrl_bits as
they can use a common helper now. The helper can also be converted to
a for loop instead of doing bit OR. And given it is a for loop now,
bit masking (using BIT_MSK) is moved from the callers there too.
Signed-off-by: Daniel Chromik <daniel.chromik@...nam.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Willy Tarreau <willy@...roxy.com>
Cc: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
---
drivers/misc/panel.c | 87 ++++++++++++++++++++++++----------------------------
1 file changed, 40 insertions(+), 47 deletions(-)
diff --git a/drivers/misc/panel.c b/drivers/misc/panel.c
index 4262db0237f9..6030ac5b8c63 100644
--- a/drivers/misc/panel.c
+++ b/drivers/misc/panel.c
@@ -648,34 +648,28 @@ static const char nexcom_keypad_profile[][4][9] = {
static const char (*keypad_profile)[4][9] = old_keypad_profile;
-/* FIXME: this should be converted to a bit array containing signals states */
-static struct {
- unsigned char e; /* parallel LCD E (data latch on falling edge) */
- unsigned char rs; /* parallel LCD RS (0 = cmd, 1 = data) */
- unsigned char rw; /* parallel LCD R/W (0 = W, 1 = R) */
- unsigned char bl; /* parallel LCD backlight (0 = off, 1 = on) */
- unsigned char cl; /* serial LCD clock (latch on rising edge) */
- unsigned char da; /* serial LCD data */
-} bits;
+static DECLARE_BITMAP(bits, LCD_BITS);
+
+static void lcd_get_bits(unsigned int port, int *val)
+{
+ unsigned int bit, state;
+
+ for (bit = 0; bit < LCD_BITS; bit++) {
+ state = test_bit(bit, bits) ? BIT_SET : BIT_CLR;
+ *val &= lcd_bits[port][bit][BIT_MSK];
+ *val |= lcd_bits[port][bit][state];
+ }
+}
static void init_scan_timer(void);
/* sets data port bits according to current signals values */
static int set_data_bits(void)
{
- int val, bit;
+ int val;
val = r_dtr(pprt);
- for (bit = 0; bit < LCD_BITS; bit++)
- val &= lcd_bits[LCD_PORT_D][bit][BIT_MSK];
-
- val |= lcd_bits[LCD_PORT_D][LCD_BIT_E][bits.e]
- | lcd_bits[LCD_PORT_D][LCD_BIT_RS][bits.rs]
- | lcd_bits[LCD_PORT_D][LCD_BIT_RW][bits.rw]
- | lcd_bits[LCD_PORT_D][LCD_BIT_BL][bits.bl]
- | lcd_bits[LCD_PORT_D][LCD_BIT_CL][bits.cl]
- | lcd_bits[LCD_PORT_D][LCD_BIT_DA][bits.da];
-
+ lcd_get_bits(LCD_PORT_D, &val);
w_dtr(pprt, val);
return val;
}
@@ -683,19 +677,10 @@ static int set_data_bits(void)
/* sets ctrl port bits according to current signals values */
static int set_ctrl_bits(void)
{
- int val, bit;
+ int val;
val = r_ctr(pprt);
- for (bit = 0; bit < LCD_BITS; bit++)
- val &= lcd_bits[LCD_PORT_C][bit][BIT_MSK];
-
- val |= lcd_bits[LCD_PORT_C][LCD_BIT_E][bits.e]
- | lcd_bits[LCD_PORT_C][LCD_BIT_RS][bits.rs]
- | lcd_bits[LCD_PORT_C][LCD_BIT_RW][bits.rw]
- | lcd_bits[LCD_PORT_C][LCD_BIT_BL][bits.bl]
- | lcd_bits[LCD_PORT_C][LCD_BIT_CL][bits.cl]
- | lcd_bits[LCD_PORT_C][LCD_BIT_DA][bits.da];
-
+ lcd_get_bits(LCD_PORT_C, &val);
w_ctr(pprt, val);
return val;
}
@@ -791,12 +776,17 @@ static void lcd_send_serial(int byte)
* LCD reads D0 on STROBE's rising edge.
*/
for (bit = 0; bit < 8; bit++) {
- bits.cl = BIT_CLR; /* CLK low */
+ clear_bit(LCD_BIT_CL, bits); /* CLK low */
panel_set_bits();
- bits.da = byte & 1;
+ if (byte & 1) {
+ set_bit(LCD_BIT_DA, bits);
+ } else {
+ clear_bit(LCD_BIT_DA, bits);
+ }
+
panel_set_bits();
udelay(2); /* maintain the data during 2 us before CLK up */
- bits.cl = BIT_SET; /* CLK high */
+ set_bit(LCD_BIT_CL, bits); /* CLK high */
panel_set_bits();
udelay(1); /* maintain the strobe during 1 us */
byte >>= 1;
@@ -811,7 +801,10 @@ static void lcd_backlight(int on)
/* The backlight is activated by setting the AUTOFEED line to +5V */
spin_lock_irq(&pprt_lock);
- bits.bl = on;
+ if (on)
+ set_bit(LCD_BIT_BL, bits);
+ else
+ clear_bit(LCD_BIT_BL, bits);
panel_set_bits();
spin_unlock_irq(&pprt_lock);
}
@@ -846,14 +839,14 @@ static void lcd_write_cmd_p8(int cmd)
w_dtr(pprt, cmd);
udelay(20); /* maintain the data during 20 us before the strobe */
- bits.e = BIT_SET;
- bits.rs = BIT_CLR;
- bits.rw = BIT_CLR;
+ set_bit(LCD_BIT_E, bits);
+ clear_bit(LCD_BIT_RS, bits);
+ clear_bit(LCD_BIT_RW, bits);
set_ctrl_bits();
udelay(40); /* maintain the strobe during 40 us */
- bits.e = BIT_CLR;
+ clear_bit(LCD_BIT_E, bits);
set_ctrl_bits();
udelay(120); /* the shortest command takes at least 120 us */
@@ -868,14 +861,14 @@ static void lcd_write_data_p8(int data)
w_dtr(pprt, data);
udelay(20); /* maintain the data during 20 us before the strobe */
- bits.e = BIT_SET;
- bits.rs = BIT_SET;
- bits.rw = BIT_CLR;
+ set_bit(LCD_BIT_E, bits);
+ set_bit(LCD_BIT_RS, bits);
+ clear_bit(LCD_BIT_RW, bits);
set_ctrl_bits();
udelay(40); /* maintain the strobe during 40 us */
- bits.e = BIT_CLR;
+ clear_bit(LCD_BIT_E, bits);
set_ctrl_bits();
udelay(45); /* the shortest data takes at least 45 us */
@@ -968,15 +961,15 @@ static void lcd_clear_fast_p8(void)
/* maintain the data during 20 us before the strobe */
udelay(20);
- bits.e = BIT_SET;
- bits.rs = BIT_SET;
- bits.rw = BIT_CLR;
+ set_bit(LCD_BIT_E, bits);
+ set_bit(LCD_BIT_RS, bits);
+ clear_bit(LCD_BIT_RW, bits);
set_ctrl_bits();
/* maintain the strobe during 40 us */
udelay(40);
- bits.e = BIT_CLR;
+ clear_bit(LCD_BIT_E, bits);
set_ctrl_bits();
/* the shortest data takes at least 45 us */
--
2.7.1
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