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