365 lines
8.4 KiB
C
365 lines
8.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Orisetech OTA5601A TFT LCD panel driver
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*
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* Copyright (C) 2021, Christophe Branchereau <cbranchereau@gmail.com>
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*/
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#include <linux/bits.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.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 OTA5601A_CTL 0x01
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#define OTA5601A_CTL_OFF 0x00
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#define OTA5601A_CTL_ON BIT(0)
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struct ota5601a_panel_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 ota5601a {
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struct drm_panel drm_panel;
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struct regmap *map;
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struct regulator *supply;
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const struct ota5601a_panel_info *panel_info;
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struct gpio_desc *reset_gpio;
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};
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static inline struct ota5601a *to_ota5601a(struct drm_panel *panel)
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{
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return container_of(panel, struct ota5601a, drm_panel);
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}
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static const struct reg_sequence ota5601a_panel_regs[] = {
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{ 0xfd, 0x00 }, /* Page Shift */
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{ 0x02, 0x00 }, /* Reset */
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{ 0x18, 0x00 }, /* Interface Sel: RGB 24 Bits */
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{ 0x34, 0x20 }, /* Undocumented */
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{ 0x0c, 0x01 }, /* Contrast set by CMD1 == within page 0x00 */
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{ 0x0d, 0x48 }, /* R Brightness */
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{ 0x0e, 0x48 }, /* G Brightness */
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{ 0x0f, 0x48 }, /* B Brightness */
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{ 0x07, 0x40 }, /* R Contrast */
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{ 0x08, 0x33 }, /* G Contrast */
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{ 0x09, 0x3a }, /* B Contrast */
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{ 0x16, 0x01 }, /* NTSC Sel */
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{ 0x19, 0x8d }, /* VBLK */
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{ 0x1a, 0x28 }, /* HBLK */
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{ 0x1c, 0x00 }, /* Scan Shift Dir. */
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{ 0xfd, 0xc5 }, /* Page Shift */
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{ 0x82, 0x0c }, /* PWR_CTRL Pump */
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{ 0xa2, 0xb4 }, /* PWR_CTRL VGH/VGL */
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{ 0xfd, 0xc4 }, /* Page Shift - What follows is listed as "RGB 24bit Timing Set" */
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{ 0x82, 0x45 },
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{ 0xfd, 0xc1 },
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{ 0x91, 0x02 },
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{ 0xfd, 0xc0 },
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{ 0xa1, 0x01 },
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{ 0xa2, 0x1f },
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{ 0xa3, 0x0b },
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{ 0xa4, 0x38 },
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{ 0xa5, 0x00 },
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{ 0xa6, 0x0a },
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{ 0xa7, 0x38 },
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{ 0xa8, 0x00 },
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{ 0xa9, 0x0a },
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{ 0xaa, 0x37 },
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{ 0xfd, 0xce },
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{ 0x81, 0x18 },
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{ 0x82, 0x43 },
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{ 0x83, 0x43 },
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{ 0x91, 0x06 },
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{ 0x93, 0x38 },
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{ 0x94, 0x02 },
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{ 0x95, 0x06 },
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{ 0x97, 0x38 },
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{ 0x98, 0x02 },
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{ 0x99, 0x06 },
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{ 0x9b, 0x38 },
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{ 0x9c, 0x02 },
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{ 0xfd, 0x00 }, /* Page Shift */
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};
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static const struct regmap_config ota5601a_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int ota5601a_prepare(struct drm_panel *drm_panel)
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{
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struct ota5601a *panel = to_ota5601a(drm_panel);
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int err;
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err = regulator_enable(panel->supply);
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if (err) {
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dev_err(drm_panel->dev, "Failed to enable power supply: %d\n", err);
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return err;
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}
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/* Reset to be held low for 10us min according to the doc, 10ms before sending commands */
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gpiod_set_value_cansleep(panel->reset_gpio, 1);
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usleep_range(10, 30);
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gpiod_set_value_cansleep(panel->reset_gpio, 0);
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usleep_range(10000, 20000);
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/* Init all registers. */
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err = regmap_multi_reg_write(panel->map, ota5601a_panel_regs,
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ARRAY_SIZE(ota5601a_panel_regs));
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if (err) {
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dev_err(drm_panel->dev, "Failed to init registers: %d\n", err);
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goto err_disable_regulator;
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}
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msleep(120);
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return 0;
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err_disable_regulator:
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regulator_disable(panel->supply);
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return err;
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}
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static int ota5601a_unprepare(struct drm_panel *drm_panel)
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{
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struct ota5601a *panel = to_ota5601a(drm_panel);
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gpiod_set_value_cansleep(panel->reset_gpio, 1);
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regulator_disable(panel->supply);
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return 0;
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}
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static int ota5601a_enable(struct drm_panel *drm_panel)
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{
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struct ota5601a *panel = to_ota5601a(drm_panel);
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int err;
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err = regmap_write(panel->map, OTA5601A_CTL, OTA5601A_CTL_ON);
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if (err) {
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dev_err(drm_panel->dev, "Unable to enable panel: %d\n", err);
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return err;
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}
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if (drm_panel->backlight) {
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/* Wait for the picture to be ready before enabling backlight */
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msleep(120);
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}
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return 0;
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}
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static int ota5601a_disable(struct drm_panel *drm_panel)
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{
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struct ota5601a *panel = to_ota5601a(drm_panel);
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int err;
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err = regmap_write(panel->map, OTA5601A_CTL, OTA5601A_CTL_OFF);
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if (err) {
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dev_err(drm_panel->dev, "Unable to disable panel: %d\n", err);
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return err;
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}
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return 0;
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}
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static int ota5601a_get_modes(struct drm_panel *drm_panel,
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struct drm_connector *connector)
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{
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struct ota5601a *panel = to_ota5601a(drm_panel);
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const struct ota5601a_panel_info *panel_info = panel->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 ota5601a_funcs = {
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.prepare = ota5601a_prepare,
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.unprepare = ota5601a_unprepare,
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.enable = ota5601a_enable,
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.disable = ota5601a_disable,
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.get_modes = ota5601a_get_modes,
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};
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static int ota5601a_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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struct device *dev = &spi->dev;
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struct ota5601a *panel;
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int err;
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panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
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if (!panel)
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return -ENOMEM;
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spi_set_drvdata(spi, panel);
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panel->panel_info = (const struct ota5601a_panel_info *)id->driver_data;
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if (!panel->panel_info)
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return -EINVAL;
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panel->supply = devm_regulator_get(dev, "power");
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if (IS_ERR(panel->supply)) {
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dev_err(dev, "Failed to get power supply\n");
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return PTR_ERR(panel->supply);
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}
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panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(panel->reset_gpio)) {
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dev_err(dev, "Failed to get reset GPIO\n");
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return PTR_ERR(panel->reset_gpio);
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}
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spi->bits_per_word = 8;
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spi->mode = SPI_MODE_3 | SPI_3WIRE;
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err = spi_setup(spi);
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if (err) {
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dev_err(dev, "Failed to setup SPI\n");
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return err;
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}
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panel->map = devm_regmap_init_spi(spi, &ota5601a_regmap_config);
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if (IS_ERR(panel->map)) {
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dev_err(dev, "Failed to init regmap\n");
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return PTR_ERR(panel->map);
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}
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drm_panel_init(&panel->drm_panel, dev, &ota5601a_funcs,
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DRM_MODE_CONNECTOR_DPI);
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err = drm_panel_of_backlight(&panel->drm_panel);
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if (err) {
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if (err != -EPROBE_DEFER)
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dev_err(dev, "Failed to get backlight handle\n");
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return err;
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}
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drm_panel_add(&panel->drm_panel);
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return 0;
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}
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static void ota5601a_remove(struct spi_device *spi)
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{
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struct ota5601a *panel = spi_get_drvdata(spi);
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drm_panel_remove(&panel->drm_panel);
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ota5601a_disable(&panel->drm_panel);
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ota5601a_unprepare(&panel->drm_panel);
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}
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static const struct drm_display_mode gpt3_display_modes[] = {
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{ /* 60 Hz */
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.clock = 27000,
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.hdisplay = 640,
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.hsync_start = 640 + 220,
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.hsync_end = 640 + 220 + 20,
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.htotal = 640 + 220 + 20 + 20,
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.vdisplay = 480,
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.vsync_start = 480 + 7,
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.vsync_end = 480 + 7 + 6,
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.vtotal = 480 + 7 + 6 + 7,
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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 = 24000,
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.hdisplay = 640,
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.hsync_start = 640 + 280,
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.hsync_end = 640 + 280 + 20,
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.htotal = 640 + 280 + 20 + 20,
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.vdisplay = 480,
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.vsync_start = 480 + 7,
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.vsync_end = 480 + 7 + 6,
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.vtotal = 480 + 7 + 6 + 7,
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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 ota5601a_panel_info gpt3_info = {
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.display_modes = gpt3_display_modes,
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.num_modes = ARRAY_SIZE(gpt3_display_modes),
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.width_mm = 71,
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.height_mm = 51,
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.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
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.bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
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};
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static const struct spi_device_id gpt3_id[] = {
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{ "gpt3", (kernel_ulong_t)&gpt3_info },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(spi, gpt3_id);
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static const struct of_device_id ota5601a_of_match[] = {
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{ .compatible = "focaltech,gpt3" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ota5601a_of_match);
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static struct spi_driver ota5601a_driver = {
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.driver = {
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.name = "ota5601a",
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.of_match_table = ota5601a_of_match,
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},
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.id_table = gpt3_id,
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.probe = ota5601a_probe,
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.remove = ota5601a_remove,
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};
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module_spi_driver(ota5601a_driver);
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MODULE_AUTHOR("Christophe Branchereau <cbranchereau@gmail.com>");
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MODULE_LICENSE("GPL");
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