450 lines
14 KiB
C
450 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 Free Electrons
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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/regulator/consumer.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_device.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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#define ST7789V_COLMOD_RGB_FMT_18BITS (6 << 4)
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#define ST7789V_COLMOD_CTRL_FMT_18BITS (6 << 0)
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#define ST7789V_RAMCTRL_CMD 0xb0
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#define ST7789V_RAMCTRL_RM_RGB BIT(4)
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#define ST7789V_RAMCTRL_DM_RGB BIT(0)
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#define ST7789V_RAMCTRL_MAGIC (3 << 6)
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#define ST7789V_RAMCTRL_EPF(n) (((n) & 3) << 4)
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#define ST7789V_RGBCTRL_CMD 0xb1
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#define ST7789V_RGBCTRL_WO BIT(7)
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#define ST7789V_RGBCTRL_RCM(n) (((n) & 3) << 5)
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#define ST7789V_RGBCTRL_VSYNC_HIGH BIT(3)
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#define ST7789V_RGBCTRL_HSYNC_HIGH BIT(2)
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#define ST7789V_RGBCTRL_PCLK_HIGH BIT(1)
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#define ST7789V_RGBCTRL_VBP(n) ((n) & 0x7f)
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#define ST7789V_RGBCTRL_HBP(n) ((n) & 0x1f)
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#define ST7789V_PORCTRL_CMD 0xb2
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#define ST7789V_PORCTRL_IDLE_BP(n) (((n) & 0xf) << 4)
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#define ST7789V_PORCTRL_IDLE_FP(n) ((n) & 0xf)
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#define ST7789V_PORCTRL_PARTIAL_BP(n) (((n) & 0xf) << 4)
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#define ST7789V_PORCTRL_PARTIAL_FP(n) ((n) & 0xf)
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#define ST7789V_GCTRL_CMD 0xb7
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#define ST7789V_GCTRL_VGHS(n) (((n) & 7) << 4)
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#define ST7789V_GCTRL_VGLS(n) ((n) & 7)
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#define ST7789V_VCOMS_CMD 0xbb
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#define ST7789V_LCMCTRL_CMD 0xc0
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#define ST7789V_LCMCTRL_XBGR BIT(5)
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#define ST7789V_LCMCTRL_XMX BIT(3)
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#define ST7789V_LCMCTRL_XMH BIT(2)
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#define ST7789V_VDVVRHEN_CMD 0xc2
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#define ST7789V_VDVVRHEN_CMDEN BIT(0)
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#define ST7789V_VRHS_CMD 0xc3
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#define ST7789V_VDVS_CMD 0xc4
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#define ST7789V_FRCTRL2_CMD 0xc6
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#define ST7789V_PWCTRL1_CMD 0xd0
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#define ST7789V_PWCTRL1_MAGIC 0xa4
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#define ST7789V_PWCTRL1_AVDD(n) (((n) & 3) << 6)
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#define ST7789V_PWCTRL1_AVCL(n) (((n) & 3) << 4)
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#define ST7789V_PWCTRL1_VDS(n) ((n) & 3)
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#define ST7789V_PVGAMCTRL_CMD 0xe0
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#define ST7789V_PVGAMCTRL_JP0(n) (((n) & 3) << 4)
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#define ST7789V_PVGAMCTRL_JP1(n) (((n) & 3) << 4)
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#define ST7789V_PVGAMCTRL_VP0(n) ((n) & 0xf)
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#define ST7789V_PVGAMCTRL_VP1(n) ((n) & 0x3f)
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#define ST7789V_PVGAMCTRL_VP2(n) ((n) & 0x3f)
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#define ST7789V_PVGAMCTRL_VP4(n) ((n) & 0x1f)
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#define ST7789V_PVGAMCTRL_VP6(n) ((n) & 0x1f)
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#define ST7789V_PVGAMCTRL_VP13(n) ((n) & 0xf)
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#define ST7789V_PVGAMCTRL_VP20(n) ((n) & 0x7f)
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#define ST7789V_PVGAMCTRL_VP27(n) ((n) & 7)
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#define ST7789V_PVGAMCTRL_VP36(n) (((n) & 7) << 4)
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#define ST7789V_PVGAMCTRL_VP43(n) ((n) & 0x7f)
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#define ST7789V_PVGAMCTRL_VP50(n) ((n) & 0xf)
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#define ST7789V_PVGAMCTRL_VP57(n) ((n) & 0x1f)
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#define ST7789V_PVGAMCTRL_VP59(n) ((n) & 0x1f)
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#define ST7789V_PVGAMCTRL_VP61(n) ((n) & 0x3f)
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#define ST7789V_PVGAMCTRL_VP62(n) ((n) & 0x3f)
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#define ST7789V_PVGAMCTRL_VP63(n) (((n) & 0xf) << 4)
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#define ST7789V_NVGAMCTRL_CMD 0xe1
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#define ST7789V_NVGAMCTRL_JN0(n) (((n) & 3) << 4)
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#define ST7789V_NVGAMCTRL_JN1(n) (((n) & 3) << 4)
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#define ST7789V_NVGAMCTRL_VN0(n) ((n) & 0xf)
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#define ST7789V_NVGAMCTRL_VN1(n) ((n) & 0x3f)
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#define ST7789V_NVGAMCTRL_VN2(n) ((n) & 0x3f)
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#define ST7789V_NVGAMCTRL_VN4(n) ((n) & 0x1f)
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#define ST7789V_NVGAMCTRL_VN6(n) ((n) & 0x1f)
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#define ST7789V_NVGAMCTRL_VN13(n) ((n) & 0xf)
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#define ST7789V_NVGAMCTRL_VN20(n) ((n) & 0x7f)
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#define ST7789V_NVGAMCTRL_VN27(n) ((n) & 7)
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#define ST7789V_NVGAMCTRL_VN36(n) (((n) & 7) << 4)
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#define ST7789V_NVGAMCTRL_VN43(n) ((n) & 0x7f)
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#define ST7789V_NVGAMCTRL_VN50(n) ((n) & 0xf)
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#define ST7789V_NVGAMCTRL_VN57(n) ((n) & 0x1f)
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#define ST7789V_NVGAMCTRL_VN59(n) ((n) & 0x1f)
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#define ST7789V_NVGAMCTRL_VN61(n) ((n) & 0x3f)
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#define ST7789V_NVGAMCTRL_VN62(n) ((n) & 0x3f)
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#define ST7789V_NVGAMCTRL_VN63(n) (((n) & 0xf) << 4)
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#define ST7789V_TEST(val, func) \
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do { \
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if ((val = (func))) \
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return val; \
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} while (0)
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struct st7789v {
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struct drm_panel panel;
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struct spi_device *spi;
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struct gpio_desc *reset;
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struct backlight_device *backlight;
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struct regulator *power;
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};
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enum st7789v_prefix {
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ST7789V_COMMAND = 0,
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ST7789V_DATA = 1,
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};
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static inline struct st7789v *panel_to_st7789v(struct drm_panel *panel)
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{
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return container_of(panel, struct st7789v, panel);
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}
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static int st7789v_spi_write(struct st7789v *ctx, enum st7789v_prefix prefix,
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u8 data)
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{
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struct spi_transfer xfer = { };
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struct spi_message msg;
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u16 txbuf = ((prefix & 1) << 8) | data;
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spi_message_init(&msg);
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xfer.tx_buf = &txbuf;
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xfer.bits_per_word = 9;
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xfer.len = sizeof(txbuf);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(ctx->spi, &msg);
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}
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static int st7789v_write_command(struct st7789v *ctx, u8 cmd)
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{
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return st7789v_spi_write(ctx, ST7789V_COMMAND, cmd);
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}
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static int st7789v_write_data(struct st7789v *ctx, u8 cmd)
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{
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return st7789v_spi_write(ctx, ST7789V_DATA, cmd);
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}
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static const struct drm_display_mode default_mode = {
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.clock = 7000,
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.hdisplay = 240,
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.hsync_start = 240 + 38,
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.hsync_end = 240 + 38 + 10,
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.htotal = 240 + 38 + 10 + 10,
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.vdisplay = 320,
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.vsync_start = 320 + 8,
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.vsync_end = 320 + 8 + 4,
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.vtotal = 320 + 8 + 4 + 4,
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.vrefresh = 60,
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};
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static int st7789v_get_modes(struct drm_panel *panel)
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{
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struct drm_connector *connector = panel->connector;
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(panel->drm, &default_mode);
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if (!mode) {
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dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
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default_mode.hdisplay, default_mode.vdisplay,
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default_mode.vrefresh);
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return -ENOMEM;
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}
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drm_mode_set_name(mode);
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mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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panel->connector->display_info.width_mm = 61;
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panel->connector->display_info.height_mm = 103;
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return 1;
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}
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static int st7789v_prepare(struct drm_panel *panel)
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{
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struct st7789v *ctx = panel_to_st7789v(panel);
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int ret;
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ret = regulator_enable(ctx->power);
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if (ret)
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return ret;
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gpiod_set_value(ctx->reset, 1);
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msleep(30);
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gpiod_set_value(ctx->reset, 0);
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msleep(120);
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ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_EXIT_SLEEP_MODE));
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/* We need to wait 120ms after a sleep out command */
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msleep(120);
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ST7789V_TEST(ret, st7789v_write_command(ctx,
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MIPI_DCS_SET_ADDRESS_MODE));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
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ST7789V_TEST(ret, st7789v_write_command(ctx,
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MIPI_DCS_SET_PIXEL_FORMAT));
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ST7789V_TEST(ret, st7789v_write_data(ctx,
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(MIPI_DCS_PIXEL_FMT_18BIT << 4) |
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(MIPI_DCS_PIXEL_FMT_18BIT)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PORCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0xc));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PORCTRL_IDLE_BP(3) |
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ST7789V_PORCTRL_IDLE_FP(3)));
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ST7789V_TEST(ret, st7789v_write_data(ctx,
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ST7789V_PORCTRL_PARTIAL_BP(3) |
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ST7789V_PORCTRL_PARTIAL_FP(3)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_GCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_GCTRL_VGLS(5) |
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ST7789V_GCTRL_VGHS(3)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VCOMS_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0x2b));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_LCMCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_LCMCTRL_XMH |
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ST7789V_LCMCTRL_XMX |
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ST7789V_LCMCTRL_XBGR));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVVRHEN_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_VDVVRHEN_CMDEN));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VRHS_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_VDVS_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0x20));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_FRCTRL2_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, 0xf));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PWCTRL1_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_MAGIC));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PWCTRL1_AVDD(2) |
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ST7789V_PWCTRL1_AVCL(2) |
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ST7789V_PWCTRL1_VDS(1)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_PVGAMCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP63(0xd)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP1(0xca)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP2(0xe)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP4(8)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP6(9)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP13(7)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP20(0x2d)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP27(0xb) |
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ST7789V_PVGAMCTRL_VP36(3)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP43(0x3d)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_JP1(3) |
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ST7789V_PVGAMCTRL_VP50(4)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP57(0xa)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP59(0xa)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP61(0x1b)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_PVGAMCTRL_VP62(0x28)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_NVGAMCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN63(0xd)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN1(0xca)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN2(0xf)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN4(8)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN6(8)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN13(7)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN20(0x2e)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN27(0xc) |
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ST7789V_NVGAMCTRL_VN36(5)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN43(0x40)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_JN1(3) |
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ST7789V_NVGAMCTRL_VN50(4)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN57(9)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN59(0xb)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN61(0x1b)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_NVGAMCTRL_VN62(0x28)));
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ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_INVERT_MODE));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RAMCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_DM_RGB |
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ST7789V_RAMCTRL_RM_RGB));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RAMCTRL_EPF(3) |
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ST7789V_RAMCTRL_MAGIC));
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ST7789V_TEST(ret, st7789v_write_command(ctx, ST7789V_RGBCTRL_CMD));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_WO |
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ST7789V_RGBCTRL_RCM(2) |
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ST7789V_RGBCTRL_VSYNC_HIGH |
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ST7789V_RGBCTRL_HSYNC_HIGH |
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ST7789V_RGBCTRL_PCLK_HIGH));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_VBP(8)));
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ST7789V_TEST(ret, st7789v_write_data(ctx, ST7789V_RGBCTRL_HBP(20)));
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return 0;
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}
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static int st7789v_enable(struct drm_panel *panel)
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{
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struct st7789v *ctx = panel_to_st7789v(panel);
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if (ctx->backlight) {
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ctx->backlight->props.state &= ~BL_CORE_FBBLANK;
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ctx->backlight->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(ctx->backlight);
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}
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return st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_ON);
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}
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static int st7789v_disable(struct drm_panel *panel)
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{
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struct st7789v *ctx = panel_to_st7789v(panel);
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int ret;
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ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_SET_DISPLAY_OFF));
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if (ctx->backlight) {
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ctx->backlight->props.power = FB_BLANK_POWERDOWN;
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ctx->backlight->props.state |= BL_CORE_FBBLANK;
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backlight_update_status(ctx->backlight);
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}
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return 0;
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}
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static int st7789v_unprepare(struct drm_panel *panel)
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{
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struct st7789v *ctx = panel_to_st7789v(panel);
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int ret;
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ST7789V_TEST(ret, st7789v_write_command(ctx, MIPI_DCS_ENTER_SLEEP_MODE));
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regulator_disable(ctx->power);
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return 0;
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|
}
|
|
|
|
static const struct drm_panel_funcs st7789v_drm_funcs = {
|
|
.disable = st7789v_disable,
|
|
.enable = st7789v_enable,
|
|
.get_modes = st7789v_get_modes,
|
|
.prepare = st7789v_prepare,
|
|
.unprepare = st7789v_unprepare,
|
|
};
|
|
|
|
static int st7789v_probe(struct spi_device *spi)
|
|
{
|
|
struct device_node *backlight;
|
|
struct st7789v *ctx;
|
|
int ret;
|
|
|
|
ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
spi_set_drvdata(spi, ctx);
|
|
ctx->spi = spi;
|
|
|
|
ctx->panel.dev = &spi->dev;
|
|
ctx->panel.funcs = &st7789v_drm_funcs;
|
|
|
|
ctx->power = devm_regulator_get(&spi->dev, "power");
|
|
if (IS_ERR(ctx->power))
|
|
return PTR_ERR(ctx->power);
|
|
|
|
ctx->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ctx->reset)) {
|
|
dev_err(&spi->dev, "Couldn't get our reset line\n");
|
|
return PTR_ERR(ctx->reset);
|
|
}
|
|
|
|
backlight = of_parse_phandle(spi->dev.of_node, "backlight", 0);
|
|
if (backlight) {
|
|
ctx->backlight = of_find_backlight_by_node(backlight);
|
|
of_node_put(backlight);
|
|
|
|
if (!ctx->backlight)
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
ret = drm_panel_add(&ctx->panel);
|
|
if (ret < 0)
|
|
goto err_free_backlight;
|
|
|
|
return 0;
|
|
|
|
err_free_backlight:
|
|
if (ctx->backlight)
|
|
put_device(&ctx->backlight->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int st7789v_remove(struct spi_device *spi)
|
|
{
|
|
struct st7789v *ctx = spi_get_drvdata(spi);
|
|
|
|
drm_panel_remove(&ctx->panel);
|
|
|
|
if (ctx->backlight)
|
|
put_device(&ctx->backlight->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id st7789v_of_match[] = {
|
|
{ .compatible = "sitronix,st7789v" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, st7789v_of_match);
|
|
|
|
static struct spi_driver st7789v_driver = {
|
|
.probe = st7789v_probe,
|
|
.remove = st7789v_remove,
|
|
.driver = {
|
|
.name = "st7789v",
|
|
.of_match_table = st7789v_of_match,
|
|
},
|
|
};
|
|
module_spi_driver(st7789v_driver);
|
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("Sitronix st7789v LCD Driver");
|
|
MODULE_LICENSE("GPL v2");
|