// SPDX-License-Identifier: GPL-2.0-only /* * l4f00242t03.c -- support for Epson L4F00242T03 LCD * * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. * * Copyright (c) 2009 Alberto Panizzo * Inspired by Marek Vasut work in l4f00242t03.c */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include struct l4f00242t03_priv { struct spi_device *spi; struct lcd_device *ld; int lcd_state; struct regulator *io_reg; struct regulator *core_reg; struct gpio_desc *reset; struct gpio_desc *enable; }; static void l4f00242t03_reset(struct gpio_desc *gpiod) { pr_debug("l4f00242t03_reset.\n"); gpiod_set_value(gpiod, 1); mdelay(100); gpiod_set_value(gpiod, 0); mdelay(10); /* tRES >= 100us */ gpiod_set_value(gpiod, 1); mdelay(20); } #define param(x) ((x) | 0x100) static void l4f00242t03_lcd_init(struct spi_device *spi) { struct l4f00242t03_priv *priv = spi_get_drvdata(spi); const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) }; int ret; dev_dbg(&spi->dev, "initializing LCD\n"); ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000); if (ret) { dev_err(&spi->dev, "failed to set the IO regulator voltage.\n"); return; } ret = regulator_enable(priv->io_reg); if (ret) { dev_err(&spi->dev, "failed to enable the IO regulator.\n"); return; } ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000); if (ret) { dev_err(&spi->dev, "failed to set the core regulator voltage.\n"); regulator_disable(priv->io_reg); return; } ret = regulator_enable(priv->core_reg); if (ret) { dev_err(&spi->dev, "failed to enable the core regulator.\n"); regulator_disable(priv->io_reg); return; } l4f00242t03_reset(priv->reset); gpiod_set_value(priv->enable, 1); msleep(60); spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16)); } static void l4f00242t03_lcd_powerdown(struct spi_device *spi) { struct l4f00242t03_priv *priv = spi_get_drvdata(spi); dev_dbg(&spi->dev, "Powering down LCD\n"); gpiod_set_value(priv->enable, 0); regulator_disable(priv->io_reg); regulator_disable(priv->core_reg); } static int l4f00242t03_lcd_power_get(struct lcd_device *ld) { struct l4f00242t03_priv *priv = lcd_get_data(ld); return priv->lcd_state; } static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power) { struct l4f00242t03_priv *priv = lcd_get_data(ld); struct spi_device *spi = priv->spi; const u16 slpout = 0x11; const u16 dison = 0x29; const u16 slpin = 0x10; const u16 disoff = 0x28; if (power <= LCD_POWER_REDUCED) { if (priv->lcd_state <= LCD_POWER_REDUCED) { /* Do nothing, the LCD is running */ } else if (priv->lcd_state < LCD_POWER_OFF) { dev_dbg(&spi->dev, "Resuming LCD\n"); spi_write(spi, (const u8 *)&slpout, sizeof(u16)); msleep(60); spi_write(spi, (const u8 *)&dison, sizeof(u16)); } else { /* priv->lcd_state == LCD_POWER_OFF */ l4f00242t03_lcd_init(spi); priv->lcd_state = LCD_POWER_REDUCED_VSYNC_SUSPEND; l4f00242t03_lcd_power_set(priv->ld, power); } } else if (power < LCD_POWER_OFF) { if (priv->lcd_state <= LCD_POWER_REDUCED) { /* Send the display in standby */ dev_dbg(&spi->dev, "Standby the LCD\n"); spi_write(spi, (const u8 *)&disoff, sizeof(u16)); msleep(60); spi_write(spi, (const u8 *)&slpin, sizeof(u16)); } else if (priv->lcd_state < LCD_POWER_OFF) { /* Do nothing, the LCD is already in standby */ } else { /* priv->lcd_state == LCD_POWER_OFF */ l4f00242t03_lcd_init(spi); priv->lcd_state = LCD_POWER_ON; l4f00242t03_lcd_power_set(ld, power); } } else { /* power == LCD_POWER_OFF */ if (priv->lcd_state != LCD_POWER_OFF) { /* Clear the screen before shutting down */ spi_write(spi, (const u8 *)&disoff, sizeof(u16)); msleep(60); l4f00242t03_lcd_powerdown(spi); } } priv->lcd_state = power; return 0; } static const struct lcd_ops l4f_ops = { .set_power = l4f00242t03_lcd_power_set, .get_power = l4f00242t03_lcd_power_get, }; static int l4f00242t03_probe(struct spi_device *spi) { struct l4f00242t03_priv *priv; int ret; priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv), GFP_KERNEL); if (priv == NULL) return -ENOMEM; spi_set_drvdata(spi, priv); spi->bits_per_word = 9; ret = spi_setup(spi); if (ret < 0) return dev_err_probe(&spi->dev, ret, "Unable to setup spi.\n"); priv->spi = spi; priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(priv->reset)) return dev_err_probe(&spi->dev, PTR_ERR(priv->reset), "Unable to get the lcd l4f00242t03 reset gpio.\n"); gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset"); priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW); if (IS_ERR(priv->enable)) return dev_err_probe(&spi->dev, PTR_ERR(priv->enable), "Unable to get the lcd l4f00242t03 data en gpio.\n"); gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable"); priv->io_reg = devm_regulator_get(&spi->dev, "vdd"); if (IS_ERR(priv->io_reg)) return dev_err_probe(&spi->dev, PTR_ERR(priv->io_reg), "%s: Unable to get the IO regulator\n", __func__); priv->core_reg = devm_regulator_get(&spi->dev, "vcore"); if (IS_ERR(priv->core_reg)) return dev_err_probe(&spi->dev, PTR_ERR(priv->core_reg), "%s: Unable to get the core regulator\n", __func__); priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev, priv, &l4f_ops); if (IS_ERR(priv->ld)) return PTR_ERR(priv->ld); /* Init the LCD */ l4f00242t03_lcd_init(spi); priv->lcd_state = LCD_POWER_REDUCED_VSYNC_SUSPEND; l4f00242t03_lcd_power_set(priv->ld, LCD_POWER_ON); dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); return 0; } static void l4f00242t03_remove(struct spi_device *spi) { struct l4f00242t03_priv *priv = spi_get_drvdata(spi); l4f00242t03_lcd_power_set(priv->ld, LCD_POWER_OFF); } static void l4f00242t03_shutdown(struct spi_device *spi) { struct l4f00242t03_priv *priv = spi_get_drvdata(spi); if (priv) l4f00242t03_lcd_power_set(priv->ld, LCD_POWER_OFF); } static struct spi_driver l4f00242t03_driver = { .driver = { .name = "l4f00242t03", }, .probe = l4f00242t03_probe, .remove = l4f00242t03_remove, .shutdown = l4f00242t03_shutdown, }; module_spi_driver(l4f00242t03_driver); MODULE_AUTHOR("Alberto Panizzo "); MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); MODULE_LICENSE("GPL v2");