280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* DRM driver for Ilitek ILI9486 panels
|
|
*
|
|
* Copyright 2020 Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>
|
|
*/
|
|
|
|
#include <linux/backlight.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/module.h>
|
|
#include <linux/property.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#include <video/mipi_display.h>
|
|
|
|
#include <drm/drm_atomic_helper.h>
|
|
#include <drm/drm_drv.h>
|
|
#include <drm/drm_fb_helper.h>
|
|
#include <drm/drm_gem_atomic_helper.h>
|
|
#include <drm/drm_gem_dma_helper.h>
|
|
#include <drm/drm_managed.h>
|
|
#include <drm/drm_mipi_dbi.h>
|
|
#include <drm/drm_modeset_helper.h>
|
|
|
|
#define ILI9486_ITFCTR1 0xb0
|
|
#define ILI9486_PWCTRL1 0xc2
|
|
#define ILI9486_VMCTRL1 0xc5
|
|
#define ILI9486_PGAMCTRL 0xe0
|
|
#define ILI9486_NGAMCTRL 0xe1
|
|
#define ILI9486_DGAMCTRL 0xe2
|
|
#define ILI9486_MADCTL_BGR BIT(3)
|
|
#define ILI9486_MADCTL_MV BIT(5)
|
|
#define ILI9486_MADCTL_MX BIT(6)
|
|
#define ILI9486_MADCTL_MY BIT(7)
|
|
|
|
/*
|
|
* The PiScreen/waveshare rpi-lcd-35 has a SPI to 16-bit parallel bus converter
|
|
* in front of the display controller. This means that 8-bit values have to be
|
|
* transferred as 16-bit.
|
|
*/
|
|
static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par,
|
|
size_t num)
|
|
{
|
|
struct spi_device *spi = mipi->spi;
|
|
unsigned int bpw = 8;
|
|
void *data = par;
|
|
u32 speed_hz;
|
|
int i, ret;
|
|
__be16 *buf;
|
|
|
|
buf = kmalloc(32 * sizeof(u16), GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* The displays are Raspberry Pi HATs and connected to the 8-bit only
|
|
* SPI controller, so 16-bit command and parameters need byte swapping
|
|
* before being transferred as 8-bit on the big endian SPI bus.
|
|
*/
|
|
buf[0] = cpu_to_be16(*cmd);
|
|
gpiod_set_value_cansleep(mipi->dc, 0);
|
|
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 2);
|
|
ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, buf, 2);
|
|
if (ret || !num)
|
|
goto free;
|
|
|
|
/* 8-bit configuration data, not 16-bit pixel data */
|
|
if (num <= 32) {
|
|
for (i = 0; i < num; i++)
|
|
buf[i] = cpu_to_be16(par[i]);
|
|
num *= 2;
|
|
data = buf;
|
|
}
|
|
|
|
/*
|
|
* Check whether pixel data bytes needs to be swapped or not
|
|
*/
|
|
if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)
|
|
bpw = 16;
|
|
|
|
gpiod_set_value_cansleep(mipi->dc, 1);
|
|
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
|
|
ret = mipi_dbi_spi_transfer(spi, speed_hz, bpw, data, num);
|
|
free:
|
|
kfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void waveshare_enable(struct drm_simple_display_pipe *pipe,
|
|
struct drm_crtc_state *crtc_state,
|
|
struct drm_plane_state *plane_state)
|
|
{
|
|
struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
|
|
struct mipi_dbi *dbi = &dbidev->dbi;
|
|
u8 addr_mode;
|
|
int ret, idx;
|
|
|
|
if (!drm_dev_enter(pipe->crtc.dev, &idx))
|
|
return;
|
|
|
|
DRM_DEBUG_KMS("\n");
|
|
|
|
ret = mipi_dbi_poweron_conditional_reset(dbidev);
|
|
if (ret < 0)
|
|
goto out_exit;
|
|
if (ret == 1)
|
|
goto out_enable;
|
|
|
|
mipi_dbi_command(dbi, ILI9486_ITFCTR1);
|
|
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
|
|
msleep(250);
|
|
|
|
mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
|
|
|
|
mipi_dbi_command(dbi, ILI9486_PWCTRL1, 0x44);
|
|
|
|
mipi_dbi_command(dbi, ILI9486_VMCTRL1, 0x00, 0x00, 0x00, 0x00);
|
|
|
|
mipi_dbi_command(dbi, ILI9486_PGAMCTRL,
|
|
0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
|
|
0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x0);
|
|
mipi_dbi_command(dbi, ILI9486_NGAMCTRL,
|
|
0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
|
|
0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
|
|
mipi_dbi_command(dbi, ILI9486_DGAMCTRL,
|
|
0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
|
|
0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00);
|
|
|
|
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
|
|
msleep(100);
|
|
|
|
out_enable:
|
|
switch (dbidev->rotation) {
|
|
case 90:
|
|
addr_mode = ILI9486_MADCTL_MY;
|
|
break;
|
|
case 180:
|
|
addr_mode = ILI9486_MADCTL_MV;
|
|
break;
|
|
case 270:
|
|
addr_mode = ILI9486_MADCTL_MX;
|
|
break;
|
|
default:
|
|
addr_mode = ILI9486_MADCTL_MV | ILI9486_MADCTL_MY |
|
|
ILI9486_MADCTL_MX;
|
|
break;
|
|
}
|
|
addr_mode |= ILI9486_MADCTL_BGR;
|
|
mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
|
|
mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
|
|
out_exit:
|
|
drm_dev_exit(idx);
|
|
}
|
|
|
|
static const struct drm_simple_display_pipe_funcs waveshare_pipe_funcs = {
|
|
.mode_valid = mipi_dbi_pipe_mode_valid,
|
|
.enable = waveshare_enable,
|
|
.disable = mipi_dbi_pipe_disable,
|
|
.update = mipi_dbi_pipe_update,
|
|
};
|
|
|
|
static const struct drm_display_mode waveshare_mode = {
|
|
DRM_SIMPLE_MODE(480, 320, 73, 49),
|
|
};
|
|
|
|
DEFINE_DRM_GEM_DMA_FOPS(ili9486_fops);
|
|
|
|
static const struct drm_driver ili9486_driver = {
|
|
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
|
|
.fops = &ili9486_fops,
|
|
DRM_GEM_DMA_DRIVER_OPS_VMAP,
|
|
.debugfs_init = mipi_dbi_debugfs_init,
|
|
.name = "ili9486",
|
|
.desc = "Ilitek ILI9486",
|
|
.date = "20200118",
|
|
.major = 1,
|
|
.minor = 0,
|
|
};
|
|
|
|
static const struct of_device_id ili9486_of_match[] = {
|
|
{ .compatible = "waveshare,rpi-lcd-35" },
|
|
{ .compatible = "ozzmaker,piscreen" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ili9486_of_match);
|
|
|
|
static const struct spi_device_id ili9486_id[] = {
|
|
{ "ili9486", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ili9486_id);
|
|
|
|
static int ili9486_probe(struct spi_device *spi)
|
|
{
|
|
struct device *dev = &spi->dev;
|
|
struct mipi_dbi_dev *dbidev;
|
|
struct drm_device *drm;
|
|
struct mipi_dbi *dbi;
|
|
struct gpio_desc *dc;
|
|
u32 rotation = 0;
|
|
int ret;
|
|
|
|
dbidev = devm_drm_dev_alloc(dev, &ili9486_driver,
|
|
struct mipi_dbi_dev, drm);
|
|
if (IS_ERR(dbidev))
|
|
return PTR_ERR(dbidev);
|
|
|
|
dbi = &dbidev->dbi;
|
|
drm = &dbidev->drm;
|
|
|
|
dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|
|
if (IS_ERR(dbi->reset))
|
|
return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
|
|
|
|
dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
|
|
if (IS_ERR(dc))
|
|
return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
|
|
|
|
dbidev->backlight = devm_of_find_backlight(dev);
|
|
if (IS_ERR(dbidev->backlight))
|
|
return PTR_ERR(dbidev->backlight);
|
|
|
|
device_property_read_u32(dev, "rotation", &rotation);
|
|
|
|
ret = mipi_dbi_spi_init(spi, dbi, dc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dbi->command = waveshare_command;
|
|
dbi->read_commands = NULL;
|
|
|
|
ret = mipi_dbi_dev_init(dbidev, &waveshare_pipe_funcs,
|
|
&waveshare_mode, rotation);
|
|
if (ret)
|
|
return ret;
|
|
|
|
drm_mode_config_reset(drm);
|
|
|
|
ret = drm_dev_register(drm, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
spi_set_drvdata(spi, drm);
|
|
|
|
drm_fbdev_generic_setup(drm, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ili9486_remove(struct spi_device *spi)
|
|
{
|
|
struct drm_device *drm = spi_get_drvdata(spi);
|
|
|
|
drm_dev_unplug(drm);
|
|
drm_atomic_helper_shutdown(drm);
|
|
}
|
|
|
|
static void ili9486_shutdown(struct spi_device *spi)
|
|
{
|
|
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
|
|
}
|
|
|
|
static struct spi_driver ili9486_spi_driver = {
|
|
.driver = {
|
|
.name = "ili9486",
|
|
.of_match_table = ili9486_of_match,
|
|
},
|
|
.id_table = ili9486_id,
|
|
.probe = ili9486_probe,
|
|
.remove = ili9486_remove,
|
|
.shutdown = ili9486_shutdown,
|
|
};
|
|
module_spi_driver(ili9486_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("Ilitek ILI9486 DRM driver");
|
|
MODULE_AUTHOR("Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|