forked from Minki/linux
9d5645ad1b
This protects device resources from use after device removal.
There are 3 ways for driver-device unbinding to happen:
- The driver module is unloaded causing the driver to be unregistered.
This can't happen as long as there are open file handles because a
reference is taken on the module.
- The device is removed (Device Tree overlay unloading).
This can happen at any time.
- The driver sysfs unbind file can be used to unbind the driver from the
device. This can happen any time.
v2: Since drm_atomic_helper_shutdown() has to be called after
drm_dev_unplug() we don't want do block ->disable after unplug.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-8-noralf@tronnes.org
246 lines
6.0 KiB
C
246 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* DRM driver for Sitronix ST7735R panels
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*
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* Copyright 2017 David Lechner <david@lechnology.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/dma-buf.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_fb_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/tinydrm/mipi-dbi.h>
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#include <drm/tinydrm/tinydrm-helpers.h>
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#define ST7735R_FRMCTR1 0xb1
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#define ST7735R_FRMCTR2 0xb2
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#define ST7735R_FRMCTR3 0xb3
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#define ST7735R_INVCTR 0xb4
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#define ST7735R_PWCTR1 0xc0
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#define ST7735R_PWCTR2 0xc1
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#define ST7735R_PWCTR3 0xc2
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#define ST7735R_PWCTR4 0xc3
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#define ST7735R_PWCTR5 0xc4
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#define ST7735R_VMCTR1 0xc5
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#define ST7735R_GAMCTRP1 0xe0
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#define ST7735R_GAMCTRN1 0xe1
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#define ST7735R_MY BIT(7)
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#define ST7735R_MX BIT(6)
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#define ST7735R_MV BIT(5)
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static void jd_t18003_t01_pipe_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 *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
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int ret, idx;
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u8 addr_mode;
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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_reset(mipi);
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if (ret)
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goto out_exit;
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msleep(150);
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mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
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msleep(500);
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mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
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mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
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mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
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0x2d);
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mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
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mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
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mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
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mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
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mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
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mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
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mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
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mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
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switch (mipi->rotation) {
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default:
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addr_mode = ST7735R_MX | ST7735R_MY;
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break;
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case 90:
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addr_mode = ST7735R_MX | ST7735R_MV;
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break;
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case 180:
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addr_mode = 0;
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break;
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case 270:
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addr_mode = ST7735R_MY | ST7735R_MV;
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break;
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}
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mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
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mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
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MIPI_DCS_PIXEL_FMT_16BIT);
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mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
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0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
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0x03, 0x10);
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mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
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0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
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0x02, 0x10);
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mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
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msleep(100);
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mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
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msleep(20);
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mipi_dbi_enable_flush(mipi, 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 jd_t18003_t01_pipe_funcs = {
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.enable = jd_t18003_t01_pipe_enable,
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.disable = mipi_dbi_pipe_disable,
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.update = mipi_dbi_pipe_update,
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.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
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};
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static const struct drm_display_mode jd_t18003_t01_mode = {
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DRM_SIMPLE_MODE(128, 160, 28, 35),
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};
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DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
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static struct drm_driver st7735r_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
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DRIVER_ATOMIC,
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.fops = &st7735r_fops,
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.release = mipi_dbi_release,
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DRM_GEM_CMA_VMAP_DRIVER_OPS,
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.debugfs_init = mipi_dbi_debugfs_init,
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.name = "st7735r",
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.desc = "Sitronix ST7735R",
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.date = "20171128",
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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 st7735r_of_match[] = {
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{ .compatible = "jianda,jd-t18003-t01" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, st7735r_of_match);
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static const struct spi_device_id st7735r_id[] = {
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{ "jd-t18003-t01", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, st7735r_id);
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static int st7735r_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct drm_device *drm;
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struct mipi_dbi *mipi;
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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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mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
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if (!mipi)
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return -ENOMEM;
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drm = &mipi->drm;
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ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
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if (ret) {
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kfree(mipi);
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return ret;
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}
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drm_mode_config_init(drm);
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mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(mipi->reset)) {
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DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
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return PTR_ERR(mipi->reset);
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}
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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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DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
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return PTR_ERR(dc);
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}
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mipi->backlight = devm_of_find_backlight(dev);
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if (IS_ERR(mipi->backlight))
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return PTR_ERR(mipi->backlight);
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device_property_read_u32(dev, "rotation", &rotation);
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ret = mipi_dbi_spi_init(spi, mipi, dc);
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if (ret)
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return ret;
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/* Cannot read from Adafruit 1.8" display via SPI */
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mipi->read_commands = NULL;
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ret = mipi_dbi_init(mipi, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_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, 32);
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return 0;
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}
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static int st7735r_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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return 0;
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}
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static void st7735r_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 st7735r_spi_driver = {
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.driver = {
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.name = "st7735r",
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.owner = THIS_MODULE,
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.of_match_table = st7735r_of_match,
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},
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.id_table = st7735r_id,
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.probe = st7735r_probe,
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.remove = st7735r_remove,
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.shutdown = st7735r_shutdown,
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};
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module_spi_driver(st7735r_spi_driver);
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MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
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MODULE_AUTHOR("David Lechner <david@lechnology.com>");
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MODULE_LICENSE("GPL");
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