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// SPDX-License-Identifier: GPL-2.0
/*
* LG.Philips LB035Q02 LCD Panel Driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific panel-lgphilips-lb035q02 driver
*
* Copyright (C) 2013 Texas Instruments Incorporated
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* Based on a driver by: Steve Sakoman <steve@sakoman.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct lb035q02_device {
struct drm_panel panel;
struct spi_device *spi;
struct gpio_desc *enable_gpio;
};
#define to_lb035q02_device(p) container_of(p, struct lb035q02_device, panel)
static int lb035q02_write(struct lb035q02_device *lcd, u16 reg, u16 val)
{
struct spi_message msg;
struct spi_transfer index_xfer = {
.len = 3,
.cs_change = 1,
};
struct spi_transfer value_xfer = {
.len = 3,
};
u8 buffer[16];
spi_message_init(&msg);
/* register index */
buffer[0] = 0x70;
buffer[1] = 0x00;
buffer[2] = reg & 0x7f;
index_xfer.tx_buf = buffer;
spi_message_add_tail(&index_xfer, &msg);
/* register value */
buffer[4] = 0x72;
buffer[5] = val >> 8;
buffer[6] = val;
value_xfer.tx_buf = buffer + 4;
spi_message_add_tail(&value_xfer, &msg);
return spi_sync(lcd->spi, &msg);
}
static int lb035q02_init(struct lb035q02_device *lcd)
{
/* Init sequence from page 28 of the lb035q02 spec. */
static const struct {
u16 index;
u16 value;
} init_data[] = {
{ 0x01, 0x6300 },
{ 0x02, 0x0200 },
{ 0x03, 0x0177 },
{ 0x04, 0x04c7 },
{ 0x05, 0xffc0 },
{ 0x06, 0xe806 },
{ 0x0a, 0x4008 },
{ 0x0b, 0x0000 },
{ 0x0d, 0x0030 },
{ 0x0e, 0x2800 },
{ 0x0f, 0x0000 },
{ 0x16, 0x9f80 },
{ 0x17, 0x0a0f },
{ 0x1e, 0x00c1 },
{ 0x30, 0x0300 },
{ 0x31, 0x0007 },
{ 0x32, 0x0000 },
{ 0x33, 0x0000 },
{ 0x34, 0x0707 },
{ 0x35, 0x0004 },
{ 0x36, 0x0302 },
{ 0x37, 0x0202 },
{ 0x3a, 0x0a0d },
{ 0x3b, 0x0806 },
};
unsigned int i;
int ret;
for (i = 0; i < ARRAY_SIZE(init_data); ++i) {
ret = lb035q02_write(lcd, init_data[i].index,
init_data[i].value);
if (ret < 0)
return ret;
}
return 0;
}
static int lb035q02_disable(struct drm_panel *panel)
{
struct lb035q02_device *lcd = to_lb035q02_device(panel);
gpiod_set_value_cansleep(lcd->enable_gpio, 0);
return 0;
}
static int lb035q02_enable(struct drm_panel *panel)
{
struct lb035q02_device *lcd = to_lb035q02_device(panel);
gpiod_set_value_cansleep(lcd->enable_gpio, 1);
return 0;
}
static const struct drm_display_mode lb035q02_mode = {
.clock = 6500,
.hdisplay = 320,
.hsync_start = 320 + 20,
.hsync_end = 320 + 20 + 2,
.htotal = 320 + 20 + 2 + 68,
.vdisplay = 240,
.vsync_start = 240 + 4,
.vsync_end = 240 + 4 + 2,
.vtotal = 240 + 4 + 2 + 18,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 70,
.height_mm = 53,
};
static int lb035q02_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &lb035q02_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = lb035q02_mode.width_mm;
connector->display_info.height_mm = lb035q02_mode.height_mm;
/*
* FIXME: According to the datasheet pixel data is sampled on the
* rising edge of the clock, but the code running on the Gumstix Overo
* Palo35 indicates sampling on the negative edge. This should be
* tested on a real device.
*/
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
| DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
return 1;
}
static const struct drm_panel_funcs lb035q02_funcs = {
.disable = lb035q02_disable,
.enable = lb035q02_enable,
.get_modes = lb035q02_get_modes,
};
static int lb035q02_probe(struct spi_device *spi)
{
struct lb035q02_device *lcd;
int ret;
lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
spi_set_drvdata(spi, lcd);
lcd->spi = spi;
lcd->enable_gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(lcd->enable_gpio)) {
dev_err(&spi->dev, "failed to parse enable gpio\n");
return PTR_ERR(lcd->enable_gpio);
}
ret = lb035q02_init(lcd);
if (ret < 0)
return ret;
drm_panel_init(&lcd->panel, &lcd->spi->dev, &lb035q02_funcs,
DRM_MODE_CONNECTOR_DPI);
return drm_panel_add(&lcd->panel);
}
static int lb035q02_remove(struct spi_device *spi)
{
struct lb035q02_device *lcd = spi_get_drvdata(spi);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
return 0;
}
static const struct of_device_id lb035q02_of_match[] = {
{ .compatible = "lgphilips,lb035q02", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lb035q02_of_match);
static const struct spi_device_id lb035q02_ids[] = {
{ "lb035q02", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, lb035q02_ids);
static struct spi_driver lb035q02_driver = {
.probe = lb035q02_probe,
.remove = lb035q02_remove,
.id_table = lb035q02_ids,
.driver = {
.name = "panel-lg-lb035q02",
.of_match_table = lb035q02_of_match,
},
};
module_spi_driver(lb035q02_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
MODULE_LICENSE("GPL");
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