diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/auxdisplay/charlcd.c | 95 | ||||
| -rw-r--r-- | drivers/auxdisplay/charlcd.h | 9 | ||||
| -rw-r--r-- | drivers/auxdisplay/hd44780.c | 2 | ||||
| -rw-r--r-- | drivers/auxdisplay/hd44780_common.c | 88 | ||||
| -rw-r--r-- | drivers/auxdisplay/hd44780_common.h | 2 | ||||
| -rw-r--r-- | drivers/auxdisplay/panel.c | 3 |
6 files changed, 110 insertions, 89 deletions
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c index 9631f70e8128..94f6b0afab13 100644 --- a/drivers/auxdisplay/charlcd.c +++ b/drivers/auxdisplay/charlcd.c @@ -8,7 +8,6 @@ #include <linux/atomic.h> #include <linux/ctype.h> -#include <linux/delay.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/module.h> @@ -26,17 +25,7 @@ /* Keep the backlight on this many seconds for each flash */ #define LCD_BL_TEMPO_PERIOD 4 -#define LCD_FLAG_B 0x0004 /* Blink on */ -#define LCD_FLAG_C 0x0008 /* Cursor on */ -#define LCD_FLAG_D 0x0010 /* Display on */ -#define LCD_FLAG_F 0x0020 /* Large font mode */ -#define LCD_FLAG_N 0x0040 /* 2-rows mode */ -#define LCD_FLAG_L 0x0080 /* Backlight enabled */ - /* LCD commands */ -#define LCD_CMD_ENTRY_MODE 0x04 /* Set entry mode */ -#define LCD_CMD_CURSOR_INC 0x02 /* Increment cursor */ - #define LCD_CMD_DISPLAY_CTRL 0x08 /* Display control */ #define LCD_CMD_DISPLAY_ON 0x04 /* Set display on */ #define LCD_CMD_CURSOR_ON 0x02 /* Set cursor on */ @@ -84,12 +73,6 @@ struct charlcd_priv { /* Device single-open policy control */ static atomic_t charlcd_available = ATOMIC_INIT(1); -/* sleeps that many milliseconds with a reschedule */ -static void long_sleep(int ms) -{ - schedule_timeout_interruptible(msecs_to_jiffies(ms)); -} - /* turn the backlight on or off */ void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on) { @@ -177,76 +160,6 @@ static void charlcd_clear_fast(struct charlcd *lcd) charlcd_home(lcd); } -static int charlcd_init_display(struct charlcd *lcd) -{ - void (*write_cmd_raw)(struct hd44780_common *hdc, int cmd); - struct charlcd_priv *priv = charlcd_to_priv(lcd); - struct hd44780_common *hdc = lcd->drvdata; - u8 init; - - if (hdc->ifwidth != 4 && hdc->ifwidth != 8) - return -EINVAL; - - priv->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 */ - - /* - * 8-bit mode, 1 line, small fonts; let's do it 3 times, to make sure - * the LCD is in 8-bit mode afterwards - */ - init = LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS; - if (hdc->ifwidth == 4) { - init >>= 4; - write_cmd_raw = hdc->write_cmd_raw4; - } else { - write_cmd_raw = hdc->write_cmd; - } - write_cmd_raw(hdc, init); - long_sleep(10); - write_cmd_raw(hdc, init); - long_sleep(10); - write_cmd_raw(hdc, init); - long_sleep(10); - - if (hdc->ifwidth == 4) { - /* Switch to 4-bit mode, 1 line, small fonts */ - hdc->write_cmd_raw4(hdc, LCD_CMD_FUNCTION_SET >> 4); - long_sleep(10); - } - - /* set font height and lines number */ - hdc->write_cmd(hdc, - LCD_CMD_FUNCTION_SET | - ((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) | - ((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) | - ((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0)); - long_sleep(10); - - /* display off, cursor off, blink off */ - hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CTRL); - long_sleep(10); - - hdc->write_cmd(hdc, - LCD_CMD_DISPLAY_CTRL | /* set display mode */ - ((priv->flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) | - ((priv->flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) | - ((priv->flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0)); - - charlcd_backlight(lcd, (priv->flags & LCD_FLAG_L) ? 1 : 0); - - long_sleep(10); - - /* entry mode set : increment, cursor shifting */ - hdc->write_cmd(hdc, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC); - - lcd->ops->clear_display(lcd); - lcd->addr.x = 0; - lcd->addr.y = 0; - return 0; -} - /* * Parses a movement command of the form "(.*);", where the group can be * any number of subcommands of the form "(x|y)[0-9]+". @@ -418,7 +331,9 @@ static inline int handle_lcd_special_code(struct charlcd *lcd) break; } case 'I': /* reinitialize display */ - charlcd_init_display(lcd); + lcd->ops->init_display(lcd); + priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D | + LCD_FLAG_C | LCD_FLAG_B; processed = 1; break; case 'G': { @@ -727,6 +642,8 @@ static int charlcd_init(struct charlcd *lcd) struct charlcd_priv *priv = charlcd_to_priv(lcd); int ret; + priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D | + LCD_FLAG_C | LCD_FLAG_B; if (lcd->ops->backlight) { mutex_init(&priv->bl_tempo_lock); INIT_DELAYED_WORK(&priv->bl_work, charlcd_bl_off); @@ -737,7 +654,7 @@ static int charlcd_init(struct charlcd *lcd) * Since charlcd_init_display() needs to write data, we have to * enable mark the LCD initialized just before. */ - ret = charlcd_init_display(lcd); + ret = lcd->ops->init_display(lcd); if (ret) return ret; diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h index a3210305cae7..dd40fd814a57 100644 --- a/drivers/auxdisplay/charlcd.h +++ b/drivers/auxdisplay/charlcd.h @@ -9,6 +9,13 @@ #ifndef _CHARLCD_H #define _CHARLCD_H +#define LCD_FLAG_B 0x0004 /* Blink on */ +#define LCD_FLAG_C 0x0008 /* Cursor on */ +#define LCD_FLAG_D 0x0010 /* Display on */ +#define LCD_FLAG_F 0x0020 /* Large font mode */ +#define LCD_FLAG_N 0x0040 /* 2-rows mode */ +#define LCD_FLAG_L 0x0080 /* Backlight enabled */ + enum charlcd_onoff { CHARLCD_OFF = 0, CHARLCD_ON, @@ -46,6 +53,7 @@ struct charlcd { * @clear_display: Again clear the whole display, set the cursor to 0, 0. The * values in addr.x and addr.y are set to 0, 0 by charlcd prior to calling this * function. + * @init_display: Initialize the display. */ struct charlcd_ops { void (*clear_fast)(struct charlcd *lcd); @@ -54,6 +62,7 @@ struct charlcd_ops { int (*gotoxy)(struct charlcd *lcd); int (*home)(struct charlcd *lcd); int (*clear_display)(struct charlcd *lcd); + int (*init_display)(struct charlcd *lcd); }; void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on); diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c index 40ea6d25dbe1..5916da09f738 100644 --- a/drivers/auxdisplay/hd44780.c +++ b/drivers/auxdisplay/hd44780.c @@ -130,6 +130,7 @@ static const struct charlcd_ops hd44780_ops_gpio8 = { .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, .clear_display = hd44780_common_clear_display, + .init_display = hd44780_common_init_display, }; /* Send a command to the LCD panel in 4 bit GPIO mode */ @@ -177,6 +178,7 @@ static const struct charlcd_ops hd44780_ops_gpio4 = { .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, .clear_display = hd44780_common_clear_display, + .init_display = hd44780_common_init_display, }; static int hd44780_probe(struct platform_device *pdev) diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c index 2f7d55668eb4..7d4aea36cc55 100644 --- a/drivers/auxdisplay/hd44780_common.c +++ b/drivers/auxdisplay/hd44780_common.c @@ -9,6 +9,19 @@ /* LCD commands */ #define LCD_CMD_DISPLAY_CLEAR 0x01 /* Clear entire display */ +#define LCD_CMD_ENTRY_MODE 0x04 /* Set entry mode */ +#define LCD_CMD_CURSOR_INC 0x02 /* Increment cursor */ + +#define LCD_CMD_DISPLAY_CTRL 0x08 /* Display control */ +#define LCD_CMD_DISPLAY_ON 0x04 /* Set display on */ +#define LCD_CMD_CURSOR_ON 0x02 /* Set cursor on */ +#define LCD_CMD_BLINK_ON 0x01 /* Set blink on */ + +#define LCD_CMD_FUNCTION_SET 0x20 /* Set function */ +#define LCD_CMD_DATA_LEN_8BITS 0x10 /* Set data length to 8 bits */ +#define LCD_CMD_TWO_LINES 0x08 /* Set to two display lines */ +#define LCD_CMD_FONT_5X10_DOTS 0x04 /* Set char font to 5x10 dots */ + #define LCD_CMD_SET_DDRAM_ADDR 0x80 /* Set display data RAM address */ /* sleeps that many milliseconds with a reschedule */ @@ -70,6 +83,81 @@ int hd44780_common_clear_display(struct charlcd *lcd) } EXPORT_SYMBOL_GPL(hd44780_common_clear_display); +int hd44780_common_init_display(struct charlcd *lcd) +{ + struct hd44780_common *hdc = lcd->drvdata; + + void (*write_cmd_raw)(struct hd44780_common *hdc, int cmd); + u8 init; + + if (hdc->ifwidth != 4 && hdc->ifwidth != 8) + return -EINVAL; + + hdc->hd44780_common_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 */ + + /* + * 8-bit mode, 1 line, small fonts; let's do it 3 times, to make sure + * the LCD is in 8-bit mode afterwards + */ + init = LCD_CMD_FUNCTION_SET | LCD_CMD_DATA_LEN_8BITS; + if (hdc->ifwidth == 4) { + init >>= 4; + write_cmd_raw = hdc->write_cmd_raw4; + } else { + write_cmd_raw = hdc->write_cmd; + } + write_cmd_raw(hdc, init); + long_sleep(10); + write_cmd_raw(hdc, init); + long_sleep(10); + write_cmd_raw(hdc, init); + long_sleep(10); + + if (hdc->ifwidth == 4) { + /* Switch to 4-bit mode, 1 line, small fonts */ + hdc->write_cmd_raw4(hdc, LCD_CMD_FUNCTION_SET >> 4); + long_sleep(10); + } + + /* set font height and lines number */ + hdc->write_cmd(hdc, + LCD_CMD_FUNCTION_SET | + ((hdc->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_F) ? + LCD_CMD_FONT_5X10_DOTS : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_N) ? + LCD_CMD_TWO_LINES : 0)); + long_sleep(10); + + /* display off, cursor off, blink off */ + hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CTRL); + long_sleep(10); + + hdc->write_cmd(hdc, + LCD_CMD_DISPLAY_CTRL | /* set display mode */ + ((hdc->hd44780_common_flags & LCD_FLAG_D) ? + LCD_CMD_DISPLAY_ON : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_C) ? + LCD_CMD_CURSOR_ON : 0) | + ((hdc->hd44780_common_flags & LCD_FLAG_B) ? + LCD_CMD_BLINK_ON : 0)); + + charlcd_backlight(lcd, + (hdc->hd44780_common_flags & LCD_FLAG_L) ? 1 : 0); + + long_sleep(10); + + /* entry mode set : increment, cursor shifting */ + hdc->write_cmd(hdc, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC); + + hd44780_common_clear_display(lcd); + return 0; +} +EXPORT_SYMBOL_GPL(hd44780_common_init_display); + struct hd44780_common *hd44780_common_alloc(void) { struct hd44780_common *hd; diff --git a/drivers/auxdisplay/hd44780_common.h b/drivers/auxdisplay/hd44780_common.h index ef11935a3764..a8e322891ce2 100644 --- a/drivers/auxdisplay/hd44780_common.h +++ b/drivers/auxdisplay/hd44780_common.h @@ -7,6 +7,7 @@ struct hd44780_common { int ifwidth; /* 4-bit or 8-bit (default) */ int bwidth; /* Default set by hd44780_alloc() */ int hwidth; /* Default set by hd44780_alloc() */ + unsigned long hd44780_common_flags; void (*write_data)(struct hd44780_common *hdc, int data); void (*write_cmd)(struct hd44780_common *hdc, int cmd); /* write_cmd_raw4 is for 4-bit connected displays only */ @@ -18,4 +19,5 @@ int hd44780_common_print(struct charlcd *lcd, int c); int hd44780_common_gotoxy(struct charlcd *lcd); int hd44780_common_home(struct charlcd *lcd); int hd44780_common_clear_display(struct charlcd *lcd); +int hd44780_common_init_display(struct charlcd *lcd); struct hd44780_common *hd44780_common_alloc(void); diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index 8adf627529f1..583bd22d3abd 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -878,6 +878,7 @@ static const struct charlcd_ops charlcd_serial_ops = { .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, .clear_display = hd44780_common_clear_display, + .init_display = hd44780_common_init_display, }; static const struct charlcd_ops charlcd_parallel_ops = { @@ -886,6 +887,7 @@ static const struct charlcd_ops charlcd_parallel_ops = { .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, .clear_display = hd44780_common_clear_display, + .init_display = hd44780_common_init_display, }; static const struct charlcd_ops charlcd_tilcd_ops = { @@ -894,6 +896,7 @@ static const struct charlcd_ops charlcd_tilcd_ops = { .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, .clear_display = hd44780_common_clear_display, + .init_display = hd44780_common_init_display, }; /* initialize the LCD driver */ |