diff options
Diffstat (limited to 'drivers/video/backlight/tdo24m.c')
| -rw-r--r-- | drivers/video/backlight/tdo24m.c | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/drivers/video/backlight/tdo24m.c b/drivers/video/backlight/tdo24m.c new file mode 100644 index 0000000..8427669 --- /dev/null +++ b/drivers/video/backlight/tdo24m.c @@ -0,0 +1,396 @@ +/* + * tdo24m - SPI-based drivers for Toppoly TDO24M series LCD panels + * + * Copyright (C) 2008 Marvell International Ltd. + * Eric Miao <eric.miao@marvell.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * publishhed by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/spi/spi.h> +#include <linux/fb.h> +#include <linux/lcd.h> + +#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) + +#define TDO24M_SPI_BUFF_SIZE (4) +#define MODE_QVGA 0 +#define MODE_VGA 1 + +struct tdo24m { + struct spi_device *spi_dev; + struct lcd_device *lcd_dev; + + struct spi_message msg; + struct spi_transfer xfer; + uint8_t *buf; + + int power; + int mode; +}; + +/* use bit 30, 31 as the indicator of command parameter number */ +#define CMD0(x) ((0 << 30) | (x)) +#define CMD1(x, x1) ((1 << 30) | ((x) << 9) | 0x100 | (x1)) +#define CMD2(x, x1, x2) ((2 << 30) | ((x) << 18) | 0x20000 |\ + ((x1) << 9) | 0x100 | (x2)) +#define CMD_NULL (-1) + +static uint32_t lcd_panel_reset[] = { + CMD0(0x1), /* reset */ + CMD0(0x0), /* nop */ + CMD0(0x0), /* nop */ + CMD0(0x0), /* nop */ + CMD_NULL, +}; + +static uint32_t lcd_panel_on[] = { + CMD0(0x29), /* Display ON */ + CMD2(0xB8, 0xFF, 0xF9), /* Output Control */ + CMD0(0x11), /* Sleep out */ + CMD1(0xB0, 0x16), /* Wake */ + CMD_NULL, +}; + +static uint32_t lcd_panel_off[] = { + CMD0(0x28), /* Display OFF */ + CMD2(0xB8, 0x80, 0x02), /* Output Control */ + CMD0(0x10), /* Sleep in */ + CMD1(0xB0, 0x00), /* Deep stand by in */ + CMD_NULL, +}; + +static uint32_t lcd_vga_pass_through[] = { + CMD1(0xB0, 0x16), + CMD1(0xBC, 0x80), + CMD1(0xE1, 0x00), + CMD1(0x36, 0x50), + CMD1(0x3B, 0x00), + CMD_NULL, +}; + +static uint32_t lcd_qvga_pass_through[] = { + CMD1(0xB0, 0x16), + CMD1(0xBC, 0x81), + CMD1(0xE1, 0x00), + CMD1(0x36, 0x50), + CMD1(0x3B, 0x22), + CMD_NULL, +}; + +static uint32_t lcd_vga_transfer[] = { + CMD1(0xcf, 0x02), /* Blanking period control (1) */ + CMD2(0xd0, 0x08, 0x04), /* Blanking period control (2) */ + CMD1(0xd1, 0x01), /* CKV timing control on/off */ + CMD2(0xd2, 0x14, 0x00), /* CKV 1,2 timing control */ + CMD2(0xd3, 0x1a, 0x0f), /* OEV timing control */ + CMD2(0xd4, 0x1f, 0xaf), /* ASW timing control (1) */ + CMD1(0xd5, 0x14), /* ASW timing control (2) */ + CMD0(0x21), /* Invert for normally black display */ + CMD0(0x29), /* Display on */ + CMD_NULL, +}; + +static uint32_t lcd_qvga_transfer[] = { + CMD1(0xd6, 0x02), /* Blanking period control (1) */ + CMD2(0xd7, 0x08, 0x04), /* Blanking period control (2) */ + CMD1(0xd8, 0x01), /* CKV timing control on/off */ + CMD2(0xd9, 0x00, 0x08), /* CKV 1,2 timing control */ + CMD2(0xde, 0x05, 0x0a), /* OEV timing control */ + CMD2(0xdf, 0x0a, 0x19), /* ASW timing control (1) */ + CMD1(0xe0, 0x0a), /* ASW timing control (2) */ + CMD0(0x21), /* Invert for normally black display */ + CMD0(0x29), /* Display on */ + CMD_NULL, +}; + +static uint32_t lcd_panel_config[] = { + CMD2(0xb8, 0xff, 0xf9), /* Output control */ + CMD0(0x11), /* sleep out */ + CMD1(0xba, 0x01), /* Display mode (1) */ + CMD1(0xbb, 0x00), /* Display mode (2) */ + CMD1(0x3a, 0x60), /* Display mode 18-bit RGB */ + CMD1(0xbf, 0x10), /* Drive system change control */ + CMD1(0xb1, 0x56), /* Booster operation setup */ + CMD1(0xb2, 0x33), /* Booster mode setup */ + CMD1(0xb3, 0x11), /* Booster frequency setup */ + CMD1(0xb4, 0x02), /* Op amp/system clock */ + CMD1(0xb5, 0x35), /* VCS voltage */ + CMD1(0xb6, 0x40), /* VCOM voltage */ + CMD1(0xb7, 0x03), /* External display signal */ + CMD1(0xbd, 0x00), /* ASW slew rate */ + CMD1(0xbe, 0x00), /* Dummy data for QuadData operation */ + CMD1(0xc0, 0x11), /* Sleep out FR count (A) */ + CMD1(0xc1, 0x11), /* Sleep out FR count (B) */ + CMD1(0xc2, 0x11), /* Sleep out FR count (C) */ + CMD2(0xc3, 0x20, 0x40), /* Sleep out FR count (D) */ + CMD2(0xc4, 0x60, 0xc0), /* Sleep out FR count (E) */ + CMD2(0xc5, 0x10, 0x20), /* Sleep out FR count (F) */ + CMD1(0xc6, 0xc0), /* Sleep out FR count (G) */ + CMD2(0xc7, 0x33, 0x43), /* Gamma 1 fine tuning (1) */ + CMD1(0xc8, 0x44), /* Gamma 1 fine tuning (2) */ + CMD1(0xc9, 0x33), /* Gamma 1 inclination adjustment */ + CMD1(0xca, 0x00), /* Gamma 1 blue offset adjustment */ + CMD2(0xec, 0x01, 0xf0), /* Horizontal clock cycles */ + CMD_NULL, +}; + +static int tdo24m_writes(struct tdo24m *lcd, uint32_t *array) +{ + struct spi_transfer *x = &lcd->xfer; + uint32_t data, *p = array; + int nparams, err = 0; + + for (; *p != CMD_NULL; p++) { + + nparams = (*p >> 30) & 0x3; + + data = *p << (7 - nparams); + switch (nparams) { + case 0: + lcd->buf[0] = (data >> 8) & 0xff; + lcd->buf[1] = data & 0xff; + break; + case 1: + lcd->buf[0] = (data >> 16) & 0xff; + lcd->buf[1] = (data >> 8) & 0xff; + lcd->buf[2] = data & 0xff; + break; + case 2: + lcd->buf[0] = (data >> 24) & 0xff; + lcd->buf[1] = (data >> 16) & 0xff; + lcd->buf[2] = (data >> 8) & 0xff; + lcd->buf[3] = data & 0xff; + break; + default: + continue; + } + x->len = nparams + 2; + err = spi_sync(lcd->spi_dev, &lcd->msg); + if (err) + break; + } + + return err; +} + +static int tdo24m_adj_mode(struct tdo24m *lcd, int mode) +{ + switch (mode) { + case MODE_VGA: + tdo24m_writes(lcd, lcd_vga_pass_through); + tdo24m_writes(lcd, lcd_panel_config); + tdo24m_writes(lcd, lcd_vga_transfer); + break; + case MODE_QVGA: + tdo24m_writes(lcd, lcd_qvga_pass_through); + tdo24m_writes(lcd, lcd_panel_config); + tdo24m_writes(lcd, lcd_qvga_transfer); + break; + default: + return -EINVAL; + } + + lcd->mode = mode; + return 0; +} + +static int tdo24m_power_on(struct tdo24m *lcd) +{ + int err; + + err = tdo24m_writes(lcd, lcd_panel_on); + if (err) + goto out; + + err = tdo24m_writes(lcd, lcd_panel_reset); + if (err) + goto out; + + err = tdo24m_adj_mode(lcd, lcd->mode); +out: + return err; +} + +static int tdo24m_power_off(struct tdo24m *lcd) +{ + return tdo24m_writes(lcd, lcd_panel_off); +} + +static int tdo24m_power(struct tdo24m *lcd, int power) +{ + int ret = 0; + + if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) + ret = tdo24m_power_on(lcd); + else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) + ret = tdo24m_power_off(lcd); + + if (!ret) + lcd->power = power; + + return ret; +} + + +static int tdo24m_set_power(struct lcd_device *ld, int power) +{ + struct tdo24m *lcd = lcd_get_data(ld); + return tdo24m_power(lcd, power); +} + +static int tdo24m_get_power(struct lcd_device *ld) +{ + struct tdo24m *lcd = lcd_get_data(ld); + return lcd->power; +} + +static int tdo24m_set_mode(struct lcd_device *ld, struct fb_videomode *m) +{ + struct tdo24m *lcd = lcd_get_data(ld); + int mode = MODE_QVGA; + + if (m->xres == 640 || m->xres == 480) + mode = MODE_VGA; + + if (lcd->mode == mode) + return 0; + + return tdo24m_adj_mode(lcd, mode); +} + +static struct lcd_ops tdo24m_ops = { + .get_power = tdo24m_get_power, + .set_power = tdo24m_set_power, + .set_mode = tdo24m_set_mode, +}; + +static int __devinit tdo24m_probe(struct spi_device *spi) +{ + struct tdo24m *lcd; + struct spi_message *m; + struct spi_transfer *x; + int err; + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_3; + err = spi_setup(spi); + if (err) + return err; + + lcd = kzalloc(sizeof(struct tdo24m), GFP_KERNEL); + if (!lcd) + return -ENOMEM; + + lcd->spi_dev = spi; + lcd->power = FB_BLANK_POWERDOWN; + lcd->mode = MODE_VGA; /* default to VGA */ + + lcd->buf = kmalloc(TDO24M_SPI_BUFF_SIZE, sizeof(GFP_KERNEL)); + if (lcd->buf == NULL) { + kfree(lcd); + return -ENOMEM; + } + + m = &lcd->msg; + x = &lcd->xfer; + + spi_message_init(m); + + x->tx_buf = &lcd->buf[0]; + spi_message_add_tail(x, m); + + lcd->lcd_dev = lcd_device_register("tdo24m", &spi->dev, + lcd, &tdo24m_ops); + if (IS_ERR(lcd->lcd_dev)) { + err = PTR_ERR(lcd->lcd_dev); + goto out_free; + } + + dev_set_drvdata(&spi->dev, lcd); + err = tdo24m_power(lcd, FB_BLANK_UNBLANK); + if (err) + goto out_unregister; + + return 0; + +out_unregister: + lcd_device_unregister(lcd->lcd_dev); +out_free: + kfree(lcd->buf); + kfree(lcd); + return err; +} + +static int __devexit tdo24m_remove(struct spi_device *spi) +{ + struct tdo24m *lcd = dev_get_drvdata(&spi->dev); + + tdo24m_power(lcd, FB_BLANK_POWERDOWN); + lcd_device_unregister(lcd->lcd_dev); + kfree(lcd->buf); + kfree(lcd); + + return 0; +} + +#ifdef CONFIG_PM +static int tdo24m_suspend(struct spi_device *spi, pm_message_t state) +{ + struct tdo24m *lcd = dev_get_drvdata(&spi->dev); + + return tdo24m_power(lcd, FB_BLANK_POWERDOWN); +} + +static int tdo24m_resume(struct spi_device *spi) +{ + struct tdo24m *lcd = dev_get_drvdata(&spi->dev); + + return tdo24m_power(lcd, FB_BLANK_UNBLANK); +} +#else +#define tdo24m_suspend NULL +#define tdo24m_resume NULL +#endif + +/* Power down all displays on reboot, poweroff or halt */ +static void tdo24m_shutdown(struct spi_device *spi) +{ + struct tdo24m *lcd = dev_get_drvdata(&spi->dev); + + tdo24m_power(lcd, FB_BLANK_POWERDOWN); +} + +static struct spi_driver tdo24m_driver = { + .driver = { + .name = "tdo24m", + .owner = THIS_MODULE, + }, + .probe = tdo24m_probe, + .remove = __devexit_p(tdo24m_remove), + .shutdown = tdo24m_shutdown, + .suspend = tdo24m_suspend, + .resume = tdo24m_resume, +}; + +static int __init tdo24m_init(void) +{ + return spi_register_driver(&tdo24m_driver); +} +module_init(tdo24m_init); + +static void __exit tdo24m_exit(void) +{ + spi_unregister_driver(&tdo24m_driver); +} +module_exit(tdo24m_exit); + +MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); +MODULE_DESCRIPTION("Driver for Toppoly TDO24M LCD Panel"); +MODULE_LICENSE("GPL"); |
