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1// SPDX-License-Identifier: GPL-2.02/*3 * LG.Philips LB035Q02 LCD Panel Driver4 *5 * Copyright (C) 2019 Texas Instruments Incorporated6 *7 * Based on the omapdrm-specific panel-lgphilips-lb035q02 driver8 *9 * Copyright (C) 2013 Texas Instruments Incorporated10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>11 *12 * Based on a driver by: Steve Sakoman <steve@sakoman.com>13 */14 15#include <linux/gpio/consumer.h>16#include <linux/module.h>17#include <linux/spi/spi.h>18 19#include <drm/drm_connector.h>20#include <drm/drm_modes.h>21#include <drm/drm_panel.h>22 23struct lb035q02_device {24 struct drm_panel panel;25 26 struct spi_device *spi;27 struct gpio_desc *enable_gpio;28};29 30#define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel)31 32static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val)33{34 struct spi_message msg;35 struct spi_transfer index_xfer = {36 .len = 3,37 .cs_change = 1,38 };39 struct spi_transfer value_xfer = {40 .len = 3,41 };42 u8 buffer[16];43 44 spi_message_init(&msg);45 46 /* register index */47 buffer[0] = 0x70;48 buffer[1] = 0x00;49 buffer[2] = reg & 0x7f;50 index_xfer.tx_buf = buffer;51 spi_message_add_tail(&index_xfer, &msg);52 53 /* register value */54 buffer[4] = 0x72;55 buffer[5] = val >> 8;56 buffer[6] = val;57 value_xfer.tx_buf = buffer + 4;58 spi_message_add_tail(&value_xfer, &msg);59 60 return spi_sync(lcd->spi, &msg);61}62 63static int lb035q02_init(struct lb035q02_device *lcd)64{65 /* Init sequence from page 28 of the lb035q02 spec. */66 static const struct {67 u16 index;68 u16 value;69 } init_data[] = {70 { 0x01, 0x6300 },71 { 0x02, 0x0200 },72 { 0x03, 0x0177 },73 { 0x04, 0x04c7 },74 { 0x05, 0xffc0 },75 { 0x06, 0xe806 },76 { 0x0a, 0x4008 },77 { 0x0b, 0x0000 },78 { 0x0d, 0x0030 },79 { 0x0e, 0x2800 },80 { 0x0f, 0x0000 },81 { 0x16, 0x9f80 },82 { 0x17, 0x0a0f },83 { 0x1e, 0x00c1 },84 { 0x30, 0x0300 },85 { 0x31, 0x0007 },86 { 0x32, 0x0000 },87 { 0x33, 0x0000 },88 { 0x34, 0x0707 },89 { 0x35, 0x0004 },90 { 0x36, 0x0302 },91 { 0x37, 0x0202 },92 { 0x3a, 0x0a0d },93 { 0x3b, 0x0806 },94 };95 96 unsigned int i;97 int ret;98 99 for (i = 0; i < ARRAY_SIZE(init_data); ++i) {100 ret = lb035q02_write(lcd, init_data[i].index,101 init_data[i].value);102 if (ret < 0)103 return ret;104 }105 106 return 0;107}108 109static int lb035q02_disable(struct drm_panel *panel)110{111 struct lb035q02_device *lcd = to_lb035q02_device(panel);112 113 gpiod_set_value_cansleep(lcd->enable_gpio, 0);114 115 return 0;116}117 118static int lb035q02_enable(struct drm_panel *panel)119{120 struct lb035q02_device *lcd = to_lb035q02_device(panel);121 122 gpiod_set_value_cansleep(lcd->enable_gpio, 1);123 124 return 0;125}126 127static const struct drm_display_mode lb035q02_mode = {128 .clock = 6500,129 .hdisplay = 320,130 .hsync_start = 320 + 20,131 .hsync_end = 320 + 20 + 2,132 .htotal = 320 + 20 + 2 + 68,133 .vdisplay = 240,134 .vsync_start = 240 + 4,135 .vsync_end = 240 + 4 + 2,136 .vtotal = 240 + 4 + 2 + 18,137 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,138 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,139 .width_mm = 70,140 .height_mm = 53,141};142 143static int lb035q02_get_modes(struct drm_panel *panel,144 struct drm_connector *connector)145{146 struct drm_display_mode *mode;147 148 mode = drm_mode_duplicate(connector->dev, &lb035q02_mode);149 if (!mode)150 return -ENOMEM;151 152 drm_mode_set_name(mode);153 drm_mode_probed_add(connector, mode);154 155 connector->display_info.width_mm = lb035q02_mode.width_mm;156 connector->display_info.height_mm = lb035q02_mode.height_mm;157 /*158 * FIXME: According to the datasheet pixel data is sampled on the159 * rising edge of the clock, but the code running on the Gumstix Overo160 * Palo35 indicates sampling on the negative edge. This should be161 * tested on a real device.162 */163 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH164 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE165 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;166 167 return 1;168}169 170static const struct drm_panel_funcs lb035q02_funcs = {171 .disable = lb035q02_disable,172 .enable = lb035q02_enable,173 .get_modes = lb035q02_get_modes,174};175 176static int lb035q02_probe(struct spi_device *spi)177{178 struct lb035q02_device *lcd;179 int ret;180 181 lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);182 if (!lcd)183 return -ENOMEM;184 185 spi_set_drvdata(spi, lcd);186 lcd->spi = spi;187 188 lcd->enable_gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);189 if (IS_ERR(lcd->enable_gpio)) {190 dev_err(&spi->dev, "failed to parse enable gpio\n");191 return PTR_ERR(lcd->enable_gpio);192 }193 194 ret = lb035q02_init(lcd);195 if (ret < 0)196 return ret;197 198 drm_panel_init(&lcd->panel, &lcd->spi->dev, &lb035q02_funcs,199 DRM_MODE_CONNECTOR_DPI);200 201 drm_panel_add(&lcd->panel);202 203 return 0;204}205 206static void lb035q02_remove(struct spi_device *spi)207{208 struct lb035q02_device *lcd = spi_get_drvdata(spi);209 210 drm_panel_remove(&lcd->panel);211 drm_panel_disable(&lcd->panel);212}213 214static const struct of_device_id lb035q02_of_match[] = {215 { .compatible = "lgphilips,lb035q02", },216 { /* sentinel */ },217};218 219MODULE_DEVICE_TABLE(of, lb035q02_of_match);220 221static const struct spi_device_id lb035q02_ids[] = {222 { "lb035q02", 0 },223 { /* sentinel */ }224};225 226MODULE_DEVICE_TABLE(spi, lb035q02_ids);227 228static struct spi_driver lb035q02_driver = {229 .probe = lb035q02_probe,230 .remove = lb035q02_remove,231 .id_table = lb035q02_ids,232 .driver = {233 .name = "panel-lg-lb035q02",234 .of_match_table = lb035q02_of_match,235 },236};237 238module_spi_driver(lb035q02_driver);239 240MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");241MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");242MODULE_LICENSE("GPL");243