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256 lines
6.5 KiB
256 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Inspired by Marek Vasut work in l4f00242t03.c |
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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/consumer.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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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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struct gpio_desc *reset; |
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struct gpio_desc *enable; |
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}; |
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static void l4f00242t03_reset(struct gpio_desc *gpiod) |
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{ |
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pr_debug("l4f00242t03_reset.\n"); |
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gpiod_set_value(gpiod, 1); |
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mdelay(100); |
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gpiod_set_value(gpiod, 0); |
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mdelay(10); /* tRES >= 100us */ |
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gpiod_set_value(gpiod, 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_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(priv->reset); |
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gpiod_set_value(priv->enable, 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_priv *priv = spi_get_drvdata(spi); |
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dev_dbg(&spi->dev, "Powering down LCD\n"); |
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gpiod_set_value(priv->enable, 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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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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priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH); |
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if (IS_ERR(priv->reset)) { |
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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 PTR_ERR(priv->reset); |
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} |
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gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset"); |
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priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW); |
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if (IS_ERR(priv->enable)) { |
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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 PTR_ERR(priv->enable); |
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} |
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gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable"); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); |
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MODULE_LICENSE("GPL v2");
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