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268 lines
6.8 KiB
268 lines
6.8 KiB
/*
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* l4f00242t03.c -- support for Epson L4F00242T03 LCD
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*
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* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
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* Inspired by Marek Vasut work in l4f00242t03.c
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/lcd.h>
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#include <linux/slab.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/l4f00242t03.h>
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struct l4f00242t03_priv {
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struct spi_device *spi;
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struct lcd_device *ld;
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int lcd_state;
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struct regulator *io_reg;
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struct regulator *core_reg;
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};
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static void l4f00242t03_reset(unsigned int gpio)
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{
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pr_debug("l4f00242t03_reset.\n");
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gpio_set_value(gpio, 1);
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mdelay(100);
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gpio_set_value(gpio, 0);
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mdelay(10); /* tRES >= 100us */
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gpio_set_value(gpio, 1);
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mdelay(20);
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}
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#define param(x) ((x) | 0x100)
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static void l4f00242t03_lcd_init(struct spi_device *spi)
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{
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struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
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struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
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const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
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int ret;
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dev_dbg(&spi->dev, "initializing LCD\n");
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ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
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if (ret) {
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dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
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return;
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}
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ret = regulator_enable(priv->io_reg);
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if (ret) {
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dev_err(&spi->dev, "failed to enable the IO regulator.\n");
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return;
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}
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ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
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if (ret) {
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dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
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regulator_disable(priv->io_reg);
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return;
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}
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ret = regulator_enable(priv->core_reg);
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if (ret) {
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dev_err(&spi->dev, "failed to enable the core regulator.\n");
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regulator_disable(priv->io_reg);
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return;
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}
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l4f00242t03_reset(pdata->reset_gpio);
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gpio_set_value(pdata->data_enable_gpio, 1);
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msleep(60);
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spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
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}
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static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
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{
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struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
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struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
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dev_dbg(&spi->dev, "Powering down LCD\n");
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gpio_set_value(pdata->data_enable_gpio, 0);
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regulator_disable(priv->io_reg);
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regulator_disable(priv->core_reg);
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}
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static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
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{
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struct l4f00242t03_priv *priv = lcd_get_data(ld);
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return priv->lcd_state;
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}
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static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
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{
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struct l4f00242t03_priv *priv = lcd_get_data(ld);
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struct spi_device *spi = priv->spi;
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const u16 slpout = 0x11;
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const u16 dison = 0x29;
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const u16 slpin = 0x10;
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const u16 disoff = 0x28;
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if (power <= FB_BLANK_NORMAL) {
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if (priv->lcd_state <= FB_BLANK_NORMAL) {
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/* Do nothing, the LCD is running */
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} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
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dev_dbg(&spi->dev, "Resuming LCD\n");
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spi_write(spi, (const u8 *)&slpout, sizeof(u16));
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msleep(60);
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spi_write(spi, (const u8 *)&dison, sizeof(u16));
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} else {
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/* priv->lcd_state == FB_BLANK_POWERDOWN */
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l4f00242t03_lcd_init(spi);
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priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
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l4f00242t03_lcd_power_set(priv->ld, power);
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}
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} else if (power < FB_BLANK_POWERDOWN) {
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if (priv->lcd_state <= FB_BLANK_NORMAL) {
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/* Send the display in standby */
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dev_dbg(&spi->dev, "Standby the LCD\n");
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spi_write(spi, (const u8 *)&disoff, sizeof(u16));
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msleep(60);
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spi_write(spi, (const u8 *)&slpin, sizeof(u16));
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} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
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/* Do nothing, the LCD is already in standby */
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} else {
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/* priv->lcd_state == FB_BLANK_POWERDOWN */
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l4f00242t03_lcd_init(spi);
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priv->lcd_state = FB_BLANK_UNBLANK;
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l4f00242t03_lcd_power_set(ld, power);
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}
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} else {
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/* power == FB_BLANK_POWERDOWN */
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if (priv->lcd_state != FB_BLANK_POWERDOWN) {
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/* Clear the screen before shutting down */
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spi_write(spi, (const u8 *)&disoff, sizeof(u16));
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msleep(60);
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l4f00242t03_lcd_powerdown(spi);
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}
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}
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priv->lcd_state = power;
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return 0;
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}
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static struct lcd_ops l4f_ops = {
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.set_power = l4f00242t03_lcd_power_set,
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.get_power = l4f00242t03_lcd_power_get,
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};
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static int l4f00242t03_probe(struct spi_device *spi)
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{
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struct l4f00242t03_priv *priv;
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struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
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int ret;
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if (pdata == NULL) {
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dev_err(&spi->dev, "Uninitialized platform data.\n");
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return -EINVAL;
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}
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priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
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GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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spi_set_drvdata(spi, priv);
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spi->bits_per_word = 9;
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spi_setup(spi);
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priv->spi = spi;
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ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
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GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
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if (ret) {
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dev_err(&spi->dev,
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"Unable to get the lcd l4f00242t03 reset gpio.\n");
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return ret;
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}
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ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
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GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
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if (ret) {
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dev_err(&spi->dev,
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"Unable to get the lcd l4f00242t03 data en gpio.\n");
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return ret;
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}
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priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
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if (IS_ERR(priv->io_reg)) {
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dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
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__func__);
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return PTR_ERR(priv->io_reg);
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}
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priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
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if (IS_ERR(priv->core_reg)) {
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dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
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__func__);
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return PTR_ERR(priv->core_reg);
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}
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priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
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priv, &l4f_ops);
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if (IS_ERR(priv->ld))
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return PTR_ERR(priv->ld);
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/* Init the LCD */
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l4f00242t03_lcd_init(spi);
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priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
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l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
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dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
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return 0;
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}
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static int l4f00242t03_remove(struct spi_device *spi)
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{
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struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
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l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
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return 0;
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}
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static void l4f00242t03_shutdown(struct spi_device *spi)
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{
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struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
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if (priv)
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l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
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}
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static struct spi_driver l4f00242t03_driver = {
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.driver = {
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.name = "l4f00242t03",
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},
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.probe = l4f00242t03_probe,
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.remove = l4f00242t03_remove,
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.shutdown = l4f00242t03_shutdown,
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};
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module_spi_driver(l4f00242t03_driver);
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MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
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MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
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MODULE_LICENSE("GPL v2");
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