332 lines
8.1 KiB
C
332 lines
8.1 KiB
C
/*
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* Power control for Samsung LTV350QV Quarter VGA LCD Panel
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*
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* Copyright (C) 2006, 2007 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/lcd.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include "ltv350qv.h"
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#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
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struct ltv350qv {
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struct spi_device *spi;
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u8 *buffer;
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int power;
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struct lcd_device *ld;
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};
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/*
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* The power-on and power-off sequences are taken from the
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* LTV350QV-F04 data sheet from Samsung. The register definitions are
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* taken from the S6F2002 command list also from Samsung. Both
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* documents are distributed with the AVR32 Linux BSP CD from Atmel.
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*
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* There's still some voodoo going on here, but it's a lot better than
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* in the first incarnation of the driver where all we had was the raw
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* numbers from the initialization sequence.
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*/
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static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val)
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{
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struct spi_message msg;
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struct spi_transfer index_xfer = {
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.len = 3,
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.cs_change = 1,
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};
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struct spi_transfer value_xfer = {
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.len = 3,
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};
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spi_message_init(&msg);
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/* register index */
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lcd->buffer[0] = LTV_OPC_INDEX;
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lcd->buffer[1] = 0x00;
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lcd->buffer[2] = reg & 0x7f;
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index_xfer.tx_buf = lcd->buffer;
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spi_message_add_tail(&index_xfer, &msg);
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/* register value */
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lcd->buffer[4] = LTV_OPC_DATA;
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lcd->buffer[5] = val >> 8;
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lcd->buffer[6] = val;
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value_xfer.tx_buf = lcd->buffer + 4;
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spi_message_add_tail(&value_xfer, &msg);
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return spi_sync(lcd->spi, &msg);
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}
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/* The comments are taken straight from the data sheet */
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static int ltv350qv_power_on(struct ltv350qv *lcd)
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{
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int ret;
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/* Power On Reset Display off State */
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if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000))
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goto err;
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msleep(15);
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/* Power Setting Function 1 */
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if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE))
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goto err;
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if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE))
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goto err_power1;
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/* Power Setting Function 2 */
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if (ltv350qv_write_reg(lcd, LTV_PWRCTL1,
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LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
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| LTV_SUPPLY_CURRENT(5)))
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goto err_power2;
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msleep(55);
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/* Instruction Setting */
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ret = ltv350qv_write_reg(lcd, LTV_IFCTL,
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LTV_NMD | LTV_REV | LTV_NL(0x1d));
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ret |= ltv350qv_write_reg(lcd, LTV_DATACTL,
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LTV_DS_SAME | LTV_CHS_480
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| LTV_DF_RGB | LTV_RGB_BGR);
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ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE,
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LTV_VSPL_ACTIVE_LOW
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| LTV_HSPL_ACTIVE_LOW
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| LTV_DPL_SAMPLE_RISING
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| LTV_EPL_ACTIVE_LOW
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| LTV_SS_RIGHT_TO_LEFT);
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ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3));
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ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
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LTV_NW_INV_1LINE | LTV_FWI(3));
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ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a);
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ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021);
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ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0));
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004);
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ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000);
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if (ret)
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goto err_settings;
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/* Wait more than 2 frames */
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msleep(20);
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/* Display On Sequence */
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ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
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LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE
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| LTV_POWER_ON | LTV_DRIVE_CURRENT(5)
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| LTV_SUPPLY_CURRENT(5));
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ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
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LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3));
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if (ret)
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goto err_disp_on;
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/* Display should now be ON. Phew. */
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return 0;
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err_disp_on:
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/*
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* Try to recover. Error handling probably isn't very useful
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* at this point, just make a best effort to switch the panel
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* off.
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*/
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ltv350qv_write_reg(lcd, LTV_PWRCTL1,
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LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
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| LTV_SUPPLY_CURRENT(5));
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ltv350qv_write_reg(lcd, LTV_GATECTL2,
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LTV_NW_INV_1LINE | LTV_FWI(3));
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err_settings:
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err_power2:
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err_power1:
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ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
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msleep(1);
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err:
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ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
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return -EIO;
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}
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static int ltv350qv_power_off(struct ltv350qv *lcd)
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{
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int ret;
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/* Display Off Sequence */
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ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
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LTV_VCOM_DISABLE
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| LTV_DRIVE_CURRENT(5)
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| LTV_SUPPLY_CURRENT(5));
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ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
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LTV_NW_INV_1LINE | LTV_FWI(3));
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/* Power down setting 1 */
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ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
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/* Wait at least 1 ms */
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msleep(1);
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/* Power down setting 2 */
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ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
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/*
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* No point in trying to recover here. If we can't switch the
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* panel off, what are we supposed to do other than inform the
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* user about the failure?
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*/
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if (ret)
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return -EIO;
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/* Display power should now be OFF */
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return 0;
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}
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static int ltv350qv_power(struct ltv350qv *lcd, int power)
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{
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int ret = 0;
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if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
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ret = ltv350qv_power_on(lcd);
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else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
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ret = ltv350qv_power_off(lcd);
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if (!ret)
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lcd->power = power;
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return ret;
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}
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static int ltv350qv_set_power(struct lcd_device *ld, int power)
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{
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struct ltv350qv *lcd = lcd_get_data(ld);
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return ltv350qv_power(lcd, power);
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}
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static int ltv350qv_get_power(struct lcd_device *ld)
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{
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struct ltv350qv *lcd = lcd_get_data(ld);
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return lcd->power;
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}
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static struct lcd_ops ltv_ops = {
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.get_power = ltv350qv_get_power,
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.set_power = ltv350qv_set_power,
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};
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static int __devinit ltv350qv_probe(struct spi_device *spi)
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{
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struct ltv350qv *lcd;
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struct lcd_device *ld;
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int ret;
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lcd = kzalloc(sizeof(struct ltv350qv), GFP_KERNEL);
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if (!lcd)
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return -ENOMEM;
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lcd->spi = spi;
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lcd->power = FB_BLANK_POWERDOWN;
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lcd->buffer = kzalloc(8, GFP_KERNEL);
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ld = lcd_device_register("ltv350qv", &spi->dev, lcd, <v_ops);
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if (IS_ERR(ld)) {
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ret = PTR_ERR(ld);
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goto out_free_lcd;
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}
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lcd->ld = ld;
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ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK);
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if (ret)
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goto out_unregister;
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dev_set_drvdata(&spi->dev, lcd);
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return 0;
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out_unregister:
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lcd_device_unregister(ld);
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out_free_lcd:
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kfree(lcd);
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return ret;
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}
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static int __devexit ltv350qv_remove(struct spi_device *spi)
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{
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struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
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ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
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lcd_device_unregister(lcd->ld);
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kfree(lcd);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ltv350qv_suspend(struct spi_device *spi, pm_message_t state)
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{
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struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
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return ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
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}
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static int ltv350qv_resume(struct spi_device *spi)
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{
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struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
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return ltv350qv_power(lcd, FB_BLANK_UNBLANK);
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}
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#else
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#define ltv350qv_suspend NULL
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#define ltv350qv_resume NULL
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#endif
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/* Power down all displays on reboot, poweroff or halt */
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static void ltv350qv_shutdown(struct spi_device *spi)
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{
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struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
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ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
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}
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static struct spi_driver ltv350qv_driver = {
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.driver = {
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.name = "ltv350qv",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = ltv350qv_probe,
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.remove = __devexit_p(ltv350qv_remove),
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.shutdown = ltv350qv_shutdown,
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.suspend = ltv350qv_suspend,
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.resume = ltv350qv_resume,
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};
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static int __init ltv350qv_init(void)
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{
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return spi_register_driver(<v350qv_driver);
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}
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static void __exit ltv350qv_exit(void)
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{
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spi_unregister_driver(<v350qv_driver);
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}
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module_init(ltv350qv_init);
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module_exit(ltv350qv_exit);
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MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
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MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("spi:ltv350qv");
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