| // 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 <maramaopercheseimorto@gmail.com> |
| * Inspired by Marek Vasut work in l4f00242t03.c |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/lcd.h> |
| #include <linux/slab.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/spi/spi.h> |
| |
| 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 <= FB_BLANK_NORMAL) { |
| if (priv->lcd_state <= FB_BLANK_NORMAL) { |
| /* Do nothing, the LCD is running */ |
| } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { |
| 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 == FB_BLANK_POWERDOWN */ |
| l4f00242t03_lcd_init(spi); |
| priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; |
| l4f00242t03_lcd_power_set(priv->ld, power); |
| } |
| } else if (power < FB_BLANK_POWERDOWN) { |
| if (priv->lcd_state <= FB_BLANK_NORMAL) { |
| /* 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 < FB_BLANK_POWERDOWN) { |
| /* Do nothing, the LCD is already in standby */ |
| } else { |
| /* priv->lcd_state == FB_BLANK_POWERDOWN */ |
| l4f00242t03_lcd_init(spi); |
| priv->lcd_state = FB_BLANK_UNBLANK; |
| l4f00242t03_lcd_power_set(ld, power); |
| } |
| } else { |
| /* power == FB_BLANK_POWERDOWN */ |
| if (priv->lcd_state != FB_BLANK_POWERDOWN) { |
| /* 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; |
| |
| 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; |
| spi_setup(spi); |
| |
| 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 = FB_BLANK_VSYNC_SUSPEND; |
| l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK); |
| |
| 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, FB_BLANK_POWERDOWN); |
| } |
| |
| static void l4f00242t03_shutdown(struct spi_device *spi) |
| { |
| struct l4f00242t03_priv *priv = spi_get_drvdata(spi); |
| |
| if (priv) |
| l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); |
| |
| } |
| |
| 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 <maramaopercheseimorto@gmail.com>"); |
| MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); |
| MODULE_LICENSE("GPL v2"); |