309 lines
7.5 KiB
C
309 lines
7.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* AU Optronics A030JTN01.0 TFT LCD panel driver
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*
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* Copyright (C) 2023, Paul Cercueil <paul@crapouillou.net>
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* Copyright (C) 2023, Christophe Branchereau <cbranchereau@gmail.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/media-bus-format.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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#define REG05 0x05
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#define REG06 0x06
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#define REG07 0x07
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#define REG05_STDBY BIT(0)
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#define REG06_VBLK GENMASK(4, 0)
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#define REG07_HBLK GENMASK(7, 0)
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struct a030jtn01_info {
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const struct drm_display_mode *display_modes;
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unsigned int num_modes;
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u16 width_mm, height_mm;
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u32 bus_format, bus_flags;
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};
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struct a030jtn01 {
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struct drm_panel panel;
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struct spi_device *spi;
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struct regmap *map;
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const struct a030jtn01_info *panel_info;
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struct regulator *supply;
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struct gpio_desc *reset_gpio;
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};
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static inline struct a030jtn01 *to_a030jtn01(struct drm_panel *panel)
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{
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return container_of(panel, struct a030jtn01, panel);
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}
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static int a030jtn01_prepare(struct drm_panel *panel)
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{
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struct a030jtn01 *priv = to_a030jtn01(panel);
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struct device *dev = &priv->spi->dev;
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unsigned int dummy;
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int err;
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err = regulator_enable(priv->supply);
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if (err) {
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dev_err(dev, "Failed to enable power supply: %d\n", err);
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return err;
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}
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usleep_range(1000, 8000);
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/* Reset the chip */
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gpiod_set_value_cansleep(priv->reset_gpio, 1);
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usleep_range(100, 8000);
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gpiod_set_value_cansleep(priv->reset_gpio, 0);
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usleep_range(2000, 8000);
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/*
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* No idea why, but a register read (doesn't matter which) is needed to
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* properly initialize the chip after a reset; otherwise, the colors
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* will be wrong. It doesn't seem to be timing-related as a msleep(200)
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* doesn't fix it.
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*/
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err = regmap_read(priv->map, REG05, &dummy);
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if (err)
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goto err_disable_regulator;
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/* Use (24 + 6) == 0x1e as the vertical back porch */
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err = regmap_write(priv->map, REG06, FIELD_PREP(REG06_VBLK, 0x1e));
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if (err)
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goto err_disable_regulator;
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/* Use (42 + 30) * 3 == 0xd8 as the horizontal back porch */
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err = regmap_write(priv->map, REG07, FIELD_PREP(REG07_HBLK, 0xd8));
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if (err)
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goto err_disable_regulator;
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return 0;
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err_disable_regulator:
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gpiod_set_value_cansleep(priv->reset_gpio, 1);
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regulator_disable(priv->supply);
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return err;
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}
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static int a030jtn01_unprepare(struct drm_panel *panel)
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{
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struct a030jtn01 *priv = to_a030jtn01(panel);
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gpiod_set_value_cansleep(priv->reset_gpio, 1);
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regulator_disable(priv->supply);
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return 0;
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}
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static int a030jtn01_enable(struct drm_panel *panel)
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{
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struct a030jtn01 *priv = to_a030jtn01(panel);
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int ret;
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ret = regmap_set_bits(priv->map, REG05, REG05_STDBY);
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if (ret)
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return ret;
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/* Wait for the picture to be stable */
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if (panel->backlight)
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msleep(100);
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return 0;
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}
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static int a030jtn01_disable(struct drm_panel *panel)
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{
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struct a030jtn01 *priv = to_a030jtn01(panel);
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return regmap_clear_bits(priv->map, REG05, REG05_STDBY);
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}
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static int a030jtn01_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct a030jtn01 *priv = to_a030jtn01(panel);
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const struct a030jtn01_info *panel_info = priv->panel_info;
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struct drm_display_mode *mode;
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unsigned int i;
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for (i = 0; i < panel_info->num_modes; i++) {
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mode = drm_mode_duplicate(connector->dev,
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&panel_info->display_modes[i]);
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if (!mode)
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return -ENOMEM;
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drm_mode_set_name(mode);
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mode->type = DRM_MODE_TYPE_DRIVER;
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if (panel_info->num_modes == 1)
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mode->type |= DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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}
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connector->display_info.bpc = 8;
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connector->display_info.width_mm = panel_info->width_mm;
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connector->display_info.height_mm = panel_info->height_mm;
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drm_display_info_set_bus_formats(&connector->display_info,
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&panel_info->bus_format, 1);
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connector->display_info.bus_flags = panel_info->bus_flags;
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return panel_info->num_modes;
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}
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static const struct drm_panel_funcs a030jtn01_funcs = {
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.prepare = a030jtn01_prepare,
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.unprepare = a030jtn01_unprepare,
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.enable = a030jtn01_enable,
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.disable = a030jtn01_disable,
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.get_modes = a030jtn01_get_modes,
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};
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static bool a030jtn01_has_reg(struct device *dev, unsigned int reg)
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{
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static const u32 a030jtn01_regs_mask = 0x001823f1fb;
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return a030jtn01_regs_mask & BIT(reg);
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};
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static const struct regmap_config a030jtn01_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.read_flag_mask = 0x40,
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.max_register = 0x1c,
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.readable_reg = a030jtn01_has_reg,
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.writeable_reg = a030jtn01_has_reg,
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};
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static int a030jtn01_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct a030jtn01 *priv;
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int err;
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spi->mode |= SPI_MODE_3 | SPI_3WIRE;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->spi = spi;
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spi_set_drvdata(spi, priv);
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priv->map = devm_regmap_init_spi(spi, &a030jtn01_regmap_config);
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if (IS_ERR(priv->map))
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return dev_err_probe(dev, PTR_ERR(priv->map), "Unable to init regmap");
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priv->panel_info = spi_get_device_match_data(spi);
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if (!priv->panel_info)
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return -EINVAL;
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priv->supply = devm_regulator_get(dev, "power");
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if (IS_ERR(priv->supply))
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return dev_err_probe(dev, PTR_ERR(priv->supply), "Failed to get power supply");
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priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(priv->reset_gpio))
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return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), "Failed to get reset GPIO");
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drm_panel_init(&priv->panel, dev, &a030jtn01_funcs,
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DRM_MODE_CONNECTOR_DPI);
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err = drm_panel_of_backlight(&priv->panel);
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if (err)
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return err;
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drm_panel_add(&priv->panel);
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return 0;
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}
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static void a030jtn01_remove(struct spi_device *spi)
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{
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struct a030jtn01 *priv = spi_get_drvdata(spi);
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drm_panel_remove(&priv->panel);
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drm_panel_disable(&priv->panel);
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drm_panel_unprepare(&priv->panel);
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}
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static const struct drm_display_mode a030jtn01_modes[] = {
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{ /* 60 Hz */
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.clock = 14400,
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.hdisplay = 320,
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.hsync_start = 320 + 8,
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.hsync_end = 320 + 8 + 42,
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.htotal = 320 + 8 + 42 + 30,
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.vdisplay = 480,
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.vsync_start = 480 + 90,
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.vsync_end = 480 + 90 + 24,
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.vtotal = 480 + 90 + 24 + 6,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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},
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{ /* 50 Hz */
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.clock = 12000,
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.hdisplay = 320,
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.hsync_start = 320 + 8,
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.hsync_end = 320 + 8 + 42,
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.htotal = 320 + 8 + 42 + 30,
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.vdisplay = 480,
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.vsync_start = 480 + 90,
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.vsync_end = 480 + 90 + 24,
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.vtotal = 480 + 90 + 24 + 6,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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},
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};
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static const struct a030jtn01_info a030jtn01_info = {
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.display_modes = a030jtn01_modes,
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.num_modes = ARRAY_SIZE(a030jtn01_modes),
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.width_mm = 70,
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.height_mm = 51,
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.bus_format = MEDIA_BUS_FMT_RGB888_3X8_DELTA,
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.bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
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};
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static const struct spi_device_id a030jtn01_id[] = {
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{ "a030jtn01", (kernel_ulong_t) &a030jtn01_info },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(spi, a030jtn01_id);
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static const struct of_device_id a030jtn01_of_match[] = {
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{ .compatible = "auo,a030jtn01" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, a030jtn01_of_match);
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static struct spi_driver a030jtn01_driver = {
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.driver = {
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.name = "auo-a030jtn01",
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.of_match_table = a030jtn01_of_match,
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},
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.id_table = a030jtn01_id,
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.probe = a030jtn01_probe,
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.remove = a030jtn01_remove,
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};
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module_spi_driver(a030jtn01_driver);
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MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
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MODULE_AUTHOR("Christophe Branchereau <cbranchereau@gmail.com>");
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MODULE_LICENSE("GPL");
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