diff options
author | Mariusz Gorski <marius.gorski@gmail.com> | 2014-11-27 21:36:51 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-12-03 00:34:34 (GMT) |
commit | 8037e2a3c00dca47ce08fca477394a6c7d82f992 (patch) | |
tree | d6ce2eb65a061550fc383b46f7f51e92ebc765e4 /drivers/staging | |
parent | 87b8e0c88195cfc98c15e717af87034efba533f6 (diff) | |
download | linux-8037e2a3c00dca47ce08fca477394a6c7d82f992.tar.xz |
staging: panel: Refactor LCD init code
Rework lcd_init method to make it a little bit more clear about
the precedence of the params, move LCD geometry and pins layout
to the LCD struct and thus make the LCD-related module params
effectively read-only.
Signed-off-by: Mariusz Gorski <marius.gorski@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/panel/panel.c | 304 |
1 files changed, 163 insertions, 141 deletions
diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c index 5868a28..0bdb447 100644 --- a/drivers/staging/panel/panel.c +++ b/drivers/staging/panel/panel.c @@ -225,6 +225,21 @@ static wait_queue_head_t keypad_read_wait; /* lcd-specific variables */ static struct { bool enabled; + int height; + int width; + int bwidth; + int hwidth; + int charset; + int proto; + /* TODO: use union here? */ + struct { + int e; + int rs; + int rw; + int cl; + int da; + int bl; + } pins; } lcd; /* Needed only for init */ @@ -766,7 +781,7 @@ static void lcd_send_serial(int byte) /* turn the backlight on or off */ static void lcd_backlight(int on) { - if (lcd_bl_pin == PIN_NONE) + if (lcd.pins.bl == PIN_NONE) return; /* The backlight is activated by setting the AUTOFEED line to +5V */ @@ -865,23 +880,23 @@ static void lcd_write_data_tilcd(int data) static void lcd_gotoxy(void) { lcd_write_cmd(0x80 /* set DDRAM address */ - | (lcd_addr_y ? lcd_hwidth : 0) + | (lcd_addr_y ? lcd.hwidth : 0) /* we force the cursor to stay at the end of the line if it wants to go farther */ - | ((lcd_addr_x < lcd_bwidth) ? lcd_addr_x & - (lcd_hwidth - 1) : lcd_bwidth - 1)); + | ((lcd_addr_x < lcd.bwidth) ? lcd_addr_x & + (lcd.hwidth - 1) : lcd.bwidth - 1)); } static void lcd_print(char c) { - if (lcd_addr_x < lcd_bwidth) { + if (lcd_addr_x < lcd.bwidth) { if (lcd_char_conv != NULL) c = lcd_char_conv[(unsigned char)c]; lcd_write_data(c); lcd_addr_x++; } /* prevents the cursor from wrapping onto the next line */ - if (lcd_addr_x == lcd_bwidth) + if (lcd_addr_x == lcd.bwidth) lcd_gotoxy(); } @@ -895,7 +910,7 @@ static void lcd_clear_fast_s(void) lcd_gotoxy(); spin_lock_irq(&pprt_lock); - for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) { + for (pos = 0; pos < lcd.height * lcd.hwidth; pos++) { lcd_send_serial(0x5F); /* R/W=W, RS=1 */ lcd_send_serial(' ' & 0x0F); lcd_send_serial((' ' >> 4) & 0x0F); @@ -918,7 +933,7 @@ static void lcd_clear_fast_p8(void) lcd_gotoxy(); spin_lock_irq(&pprt_lock); - for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) { + for (pos = 0; pos < lcd.height * lcd.hwidth; pos++) { /* present the data to the data port */ w_dtr(pprt, ' '); @@ -956,7 +971,7 @@ static void lcd_clear_fast_tilcd(void) lcd_gotoxy(); spin_lock_irq(&pprt_lock); - for (pos = 0; pos < lcd_height * lcd_hwidth; pos++) { + for (pos = 0; pos < lcd.height * lcd.hwidth; pos++) { /* present the data to the data port */ w_dtr(pprt, ' '); udelay(60); @@ -981,7 +996,7 @@ static void lcd_clear_display(void) static void lcd_init_display(void) { - lcd_flags = ((lcd_height > 1) ? LCD_FLAG_N : 0) + lcd_flags = ((lcd.height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D | LCD_FLAG_C | LCD_FLAG_B; long_sleep(20); /* wait 20 ms after power-up for the paranoid */ @@ -1095,17 +1110,17 @@ static inline int handle_lcd_special_code(void) case 'l': /* Shift Cursor Left */ if (lcd_addr_x > 0) { /* back one char if not at end of line */ - if (lcd_addr_x < lcd_bwidth) + if (lcd_addr_x < lcd.bwidth) lcd_write_cmd(0x10); lcd_addr_x--; } processed = 1; break; case 'r': /* shift cursor right */ - if (lcd_addr_x < lcd_width) { + if (lcd_addr_x < lcd.width) { /* allow the cursor to pass the end of the line */ if (lcd_addr_x < - (lcd_bwidth - 1)) + (lcd.bwidth - 1)) lcd_write_cmd(0x14); lcd_addr_x++; } @@ -1124,7 +1139,7 @@ static inline int handle_lcd_special_code(void) case 'k': { /* kill end of line */ int x; - for (x = lcd_addr_x; x < lcd_bwidth; x++) + for (x = lcd_addr_x; x < lcd.bwidth; x++) lcd_write_data(' '); /* restore cursor position */ @@ -1272,7 +1287,7 @@ static void lcd_write_char(char c) if (lcd_addr_x > 0) { /* check if we're not at the end of the line */ - if (lcd_addr_x < lcd_bwidth) + if (lcd_addr_x < lcd.bwidth) /* back one char */ lcd_write_cmd(0x10); lcd_addr_x--; @@ -1289,10 +1304,10 @@ static void lcd_write_char(char c) case '\n': /* flush the remainder of the current line and go to the beginning of the next line */ - for (; lcd_addr_x < lcd_bwidth; lcd_addr_x++) + for (; lcd_addr_x < lcd.bwidth; lcd_addr_x++) lcd_write_data(' '); lcd_addr_x = 0; - lcd_addr_y = (lcd_addr_y + 1) % lcd_height; + lcd_addr_y = (lcd_addr_y + 1) % lcd.height; lcd_gotoxy(); break; case '\r': @@ -1421,174 +1436,164 @@ static void lcd_init(void) switch (selected_lcd_type) { case LCD_TYPE_OLD: /* parallel mode, 8 bits */ - if (lcd_proto == NOT_SET) - lcd_proto = LCD_PROTO_PARALLEL; - if (lcd_charset == NOT_SET) - lcd_charset = LCD_CHARSET_NORMAL; - if (lcd_e_pin == PIN_NOT_SET) - lcd_e_pin = PIN_STROBE; - if (lcd_rs_pin == PIN_NOT_SET) - lcd_rs_pin = PIN_AUTOLF; - - if (lcd_width == NOT_SET) - lcd_width = 40; - if (lcd_bwidth == NOT_SET) - lcd_bwidth = 40; - if (lcd_hwidth == NOT_SET) - lcd_hwidth = 64; - if (lcd_height == NOT_SET) - lcd_height = 2; + lcd.proto = LCD_PROTO_PARALLEL; + lcd.charset = LCD_CHARSET_NORMAL; + lcd.pins.e = PIN_STROBE; + lcd.pins.rs = PIN_AUTOLF; + + lcd.width = 40; + lcd.bwidth = 40; + lcd.hwidth = 64; + lcd.height = 2; break; case LCD_TYPE_KS0074: /* serial mode, ks0074 */ - if (lcd_proto == NOT_SET) - lcd_proto = LCD_PROTO_SERIAL; - if (lcd_charset == NOT_SET) - lcd_charset = LCD_CHARSET_KS0074; - if (lcd_bl_pin == PIN_NOT_SET) - lcd_bl_pin = PIN_AUTOLF; - if (lcd_cl_pin == PIN_NOT_SET) - lcd_cl_pin = PIN_STROBE; - if (lcd_da_pin == PIN_NOT_SET) - lcd_da_pin = PIN_D0; - - if (lcd_width == NOT_SET) - lcd_width = 16; - if (lcd_bwidth == NOT_SET) - lcd_bwidth = 40; - if (lcd_hwidth == NOT_SET) - lcd_hwidth = 16; - if (lcd_height == NOT_SET) - lcd_height = 2; + lcd.proto = LCD_PROTO_SERIAL; + lcd.charset = LCD_CHARSET_KS0074; + lcd.pins.bl = PIN_AUTOLF; + lcd.pins.cl = PIN_STROBE; + lcd.pins.da = PIN_D0; + + lcd.width = 16; + lcd.bwidth = 40; + lcd.hwidth = 16; + lcd.height = 2; break; case LCD_TYPE_NEXCOM: /* parallel mode, 8 bits, generic */ - if (lcd_proto == NOT_SET) - lcd_proto = LCD_PROTO_PARALLEL; - if (lcd_charset == NOT_SET) - lcd_charset = LCD_CHARSET_NORMAL; - if (lcd_e_pin == PIN_NOT_SET) - lcd_e_pin = PIN_AUTOLF; - if (lcd_rs_pin == PIN_NOT_SET) - lcd_rs_pin = PIN_SELECP; - if (lcd_rw_pin == PIN_NOT_SET) - lcd_rw_pin = PIN_INITP; - - if (lcd_width == NOT_SET) - lcd_width = 16; - if (lcd_bwidth == NOT_SET) - lcd_bwidth = 40; - if (lcd_hwidth == NOT_SET) - lcd_hwidth = 64; - if (lcd_height == NOT_SET) - lcd_height = 2; + lcd.proto = LCD_PROTO_PARALLEL; + lcd.charset = LCD_CHARSET_NORMAL; + lcd.pins.e = PIN_AUTOLF; + lcd.pins.rs = PIN_SELECP; + lcd.pins.rw = PIN_INITP; + + lcd.width = 16; + lcd.bwidth = 40; + lcd.hwidth = 64; + lcd.height = 2; break; case LCD_TYPE_CUSTOM: /* customer-defined */ - if (lcd_proto == NOT_SET) - lcd_proto = DEFAULT_LCD_PROTO; - if (lcd_charset == NOT_SET) - lcd_charset = DEFAULT_LCD_CHARSET; + lcd.proto = DEFAULT_LCD_PROTO; + lcd.charset = DEFAULT_LCD_CHARSET; /* default geometry will be set later */ break; case LCD_TYPE_HANTRONIX: /* parallel mode, 8 bits, hantronix-like */ default: - if (lcd_proto == NOT_SET) - lcd_proto = LCD_PROTO_PARALLEL; - if (lcd_charset == NOT_SET) - lcd_charset = LCD_CHARSET_NORMAL; - if (lcd_e_pin == PIN_NOT_SET) - lcd_e_pin = PIN_STROBE; - if (lcd_rs_pin == PIN_NOT_SET) - lcd_rs_pin = PIN_SELECP; - - if (lcd_width == NOT_SET) - lcd_width = 16; - if (lcd_bwidth == NOT_SET) - lcd_bwidth = 40; - if (lcd_hwidth == NOT_SET) - lcd_hwidth = 64; - if (lcd_height == NOT_SET) - lcd_height = 2; + lcd.proto = LCD_PROTO_PARALLEL; + lcd.charset = LCD_CHARSET_NORMAL; + lcd.pins.e = PIN_STROBE; + lcd.pins.rs = PIN_SELECP; + + lcd.width = 16; + lcd.bwidth = 40; + lcd.hwidth = 64; + lcd.height = 2; break; } + /* Overwrite with module params set on loading */ + if (lcd_height > -1) + lcd.height = lcd_height; + if (lcd_width > -1) + lcd.width = lcd_width; + if (lcd_bwidth > -1) + lcd.bwidth = lcd_bwidth; + if (lcd_hwidth > -1) + lcd.hwidth = lcd_hwidth; + if (lcd_charset > -1) + lcd.charset = lcd_charset; + if (lcd_proto > -1) + lcd.proto = lcd_proto; + if (lcd_e_pin != PIN_NOT_SET) + lcd.pins.e = lcd_e_pin; + if (lcd_rs_pin != PIN_NOT_SET) + lcd.pins.rs = lcd_rs_pin; + if (lcd_rw_pin != PIN_NOT_SET) + lcd.pins.rw = lcd_rw_pin; + if (lcd_cl_pin != PIN_NOT_SET) + lcd.pins.cl = lcd_cl_pin; + if (lcd_da_pin != PIN_NOT_SET) + lcd.pins.da = lcd_da_pin; + if (lcd_bl_pin != PIN_NOT_SET) + lcd.pins.bl = lcd_bl_pin; + /* this is used to catch wrong and default values */ - if (lcd_width <= 0) - lcd_width = DEFAULT_LCD_WIDTH; - if (lcd_bwidth <= 0) - lcd_bwidth = DEFAULT_LCD_BWIDTH; - if (lcd_hwidth <= 0) - lcd_hwidth = DEFAULT_LCD_HWIDTH; - if (lcd_height <= 0) - lcd_height = DEFAULT_LCD_HEIGHT; - - if (lcd_proto == LCD_PROTO_SERIAL) { /* SERIAL */ + if (lcd.width <= 0) + lcd.width = DEFAULT_LCD_WIDTH; + if (lcd.bwidth <= 0) + lcd.bwidth = DEFAULT_LCD_BWIDTH; + if (lcd.hwidth <= 0) + lcd.hwidth = DEFAULT_LCD_HWIDTH; + if (lcd.height <= 0) + lcd.height = DEFAULT_LCD_HEIGHT; + + if (lcd.proto == LCD_PROTO_SERIAL) { /* SERIAL */ lcd_write_cmd = lcd_write_cmd_s; lcd_write_data = lcd_write_data_s; lcd_clear_fast = lcd_clear_fast_s; - if (lcd_cl_pin == PIN_NOT_SET) - lcd_cl_pin = DEFAULT_LCD_PIN_SCL; - if (lcd_da_pin == PIN_NOT_SET) - lcd_da_pin = DEFAULT_LCD_PIN_SDA; + if (lcd.pins.cl == PIN_NOT_SET) + lcd.pins.cl = DEFAULT_LCD_PIN_SCL; + if (lcd.pins.da == PIN_NOT_SET) + lcd.pins.da = DEFAULT_LCD_PIN_SDA; - } else if (lcd_proto == LCD_PROTO_PARALLEL) { /* PARALLEL */ + } else if (lcd.proto == LCD_PROTO_PARALLEL) { /* PARALLEL */ lcd_write_cmd = lcd_write_cmd_p8; lcd_write_data = lcd_write_data_p8; lcd_clear_fast = lcd_clear_fast_p8; - if (lcd_e_pin == PIN_NOT_SET) - lcd_e_pin = DEFAULT_LCD_PIN_E; - if (lcd_rs_pin == PIN_NOT_SET) - lcd_rs_pin = DEFAULT_LCD_PIN_RS; - if (lcd_rw_pin == PIN_NOT_SET) - lcd_rw_pin = DEFAULT_LCD_PIN_RW; + if (lcd.pins.e == PIN_NOT_SET) + lcd.pins.e = DEFAULT_LCD_PIN_E; + if (lcd.pins.rs == PIN_NOT_SET) + lcd.pins.rs = DEFAULT_LCD_PIN_RS; + if (lcd.pins.rw == PIN_NOT_SET) + lcd.pins.rw = DEFAULT_LCD_PIN_RW; } else { lcd_write_cmd = lcd_write_cmd_tilcd; lcd_write_data = lcd_write_data_tilcd; lcd_clear_fast = lcd_clear_fast_tilcd; } - if (lcd_bl_pin == PIN_NOT_SET) - lcd_bl_pin = DEFAULT_LCD_PIN_BL; - - if (lcd_e_pin == PIN_NOT_SET) - lcd_e_pin = PIN_NONE; - if (lcd_rs_pin == PIN_NOT_SET) - lcd_rs_pin = PIN_NONE; - if (lcd_rw_pin == PIN_NOT_SET) - lcd_rw_pin = PIN_NONE; - if (lcd_bl_pin == PIN_NOT_SET) - lcd_bl_pin = PIN_NONE; - if (lcd_cl_pin == PIN_NOT_SET) - lcd_cl_pin = PIN_NONE; - if (lcd_da_pin == PIN_NOT_SET) - lcd_da_pin = PIN_NONE; - - if (lcd_charset == NOT_SET) - lcd_charset = DEFAULT_LCD_CHARSET; - - if (lcd_charset == LCD_CHARSET_KS0074) + if (lcd.pins.bl == PIN_NOT_SET) + lcd.pins.bl = DEFAULT_LCD_PIN_BL; + + if (lcd.pins.e == PIN_NOT_SET) + lcd.pins.e = PIN_NONE; + if (lcd.pins.rs == PIN_NOT_SET) + lcd.pins.rs = PIN_NONE; + if (lcd.pins.rw == PIN_NOT_SET) + lcd.pins.rw = PIN_NONE; + if (lcd.pins.bl == PIN_NOT_SET) + lcd.pins.bl = PIN_NONE; + if (lcd.pins.cl == PIN_NOT_SET) + lcd.pins.cl = PIN_NONE; + if (lcd.pins.da == PIN_NOT_SET) + lcd.pins.da = PIN_NONE; + + if (lcd.charset == NOT_SET) + lcd.charset = DEFAULT_LCD_CHARSET; + + if (lcd.charset == LCD_CHARSET_KS0074) lcd_char_conv = lcd_char_conv_ks0074; else lcd_char_conv = NULL; - if (lcd_bl_pin != PIN_NONE) + if (lcd.pins.bl != PIN_NONE) init_scan_timer(); - pin_to_bits(lcd_e_pin, lcd_bits[LCD_PORT_D][LCD_BIT_E], + pin_to_bits(lcd.pins.e, lcd_bits[LCD_PORT_D][LCD_BIT_E], lcd_bits[LCD_PORT_C][LCD_BIT_E]); - pin_to_bits(lcd_rs_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RS], + pin_to_bits(lcd.pins.rs, lcd_bits[LCD_PORT_D][LCD_BIT_RS], lcd_bits[LCD_PORT_C][LCD_BIT_RS]); - pin_to_bits(lcd_rw_pin, lcd_bits[LCD_PORT_D][LCD_BIT_RW], + pin_to_bits(lcd.pins.rw, lcd_bits[LCD_PORT_D][LCD_BIT_RW], lcd_bits[LCD_PORT_C][LCD_BIT_RW]); - pin_to_bits(lcd_bl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_BL], + pin_to_bits(lcd.pins.bl, lcd_bits[LCD_PORT_D][LCD_BIT_BL], lcd_bits[LCD_PORT_C][LCD_BIT_BL]); - pin_to_bits(lcd_cl_pin, lcd_bits[LCD_PORT_D][LCD_BIT_CL], + pin_to_bits(lcd.pins.cl, lcd_bits[LCD_PORT_D][LCD_BIT_CL], lcd_bits[LCD_PORT_C][LCD_BIT_CL]); - pin_to_bits(lcd_da_pin, lcd_bits[LCD_PORT_D][LCD_BIT_DA], + pin_to_bits(lcd.pins.da, lcd_bits[LCD_PORT_D][LCD_BIT_DA], lcd_bits[LCD_PORT_C][LCD_BIT_DA]); /* before this line, we must NOT send anything to the display. @@ -2279,6 +2284,23 @@ static int __init panel_init_module(void) } /* + * Init lcd struct with load-time values to preserve exact current + * functionality (at least for now). + */ + lcd.height = lcd_height; + lcd.width = lcd_width; + lcd.bwidth = lcd_bwidth; + lcd.hwidth = lcd_hwidth; + lcd.charset = lcd_charset; + lcd.proto = lcd_proto; + lcd.pins.e = lcd_e_pin; + lcd.pins.rs = lcd_rs_pin; + lcd.pins.rw = lcd_rw_pin; + lcd.pins.cl = lcd_cl_pin; + lcd.pins.da = lcd_da_pin; + lcd.pins.bl = lcd_bl_pin; + + /* * Overwrite selection with module param values (both keypad and lcd), * where the deprecated params have lower prio. */ |