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Message-ID: <250116b5-4339-4608-99ba-9c0dba489dc4@suse.de>
Date: Thu, 4 Sep 2025 12:34:36 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: LiangCheng Wang <zaq14760@...il.com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Wig Cheng <onlywig@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v5 3/3] drm: tiny: Add support for Mayqueen Pixpaper e-ink
panel
Hi
Am 02.09.25 um 08:53 schrieb LiangCheng Wang:
> Introduce a DRM driver for the Mayqueen Pixpaper e-ink display panel,
> which is controlled via SPI. The driver supports a 122x250 resolution
> display with XRGB8888 format.
>
> Also, add a MAINTAINERS entry for the Pixpaper driver.
>
> Signed-off-by: LiangCheng Wang <zaq14760@...il.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
Thank you so much for the driver. I will merge the series into
drm-misc-next soon.
Best regards
Thomas
> ---
> MAINTAINERS | 7 +
> drivers/gpu/drm/tiny/Kconfig | 15 +
> drivers/gpu/drm/tiny/Makefile | 1 +
> drivers/gpu/drm/tiny/pixpaper.c | 1171 +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 1194 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6dcfbd11efef87927041f5cf58d70633dbb4b18d..790bc2d0b34fc08e9f73c9caa1e6ddada57d07ac 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7866,6 +7866,13 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git
> F: Documentation/devicetree/bindings/display/repaper.txt
> F: drivers/gpu/drm/tiny/repaper.c
>
> +DRM DRIVER FOR PIXPAPER E-INK PANEL
> +M: LiangCheng Wang <zaq14760@...il.com>
> +L: dri-devel@...ts.freedesktop.org
> +S: Maintained
> +F: Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml
> +F: drivers/gpu/drm/tiny/pixpaper.c
> +
> DRM DRIVER FOR QEMU'S CIRRUS DEVICE
> M: Dave Airlie <airlied@...hat.com>
> M: Gerd Hoffmann <kraxel@...hat.com>
> diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
> index 06e54694a7f2fe1649e1886f039926b24f698e0d..94a5bf61a115929640022128e20c723ab7c0e735 100644
> --- a/drivers/gpu/drm/tiny/Kconfig
> +++ b/drivers/gpu/drm/tiny/Kconfig
> @@ -82,6 +82,21 @@ config DRM_PANEL_MIPI_DBI
> https://github.com/notro/panel-mipi-dbi/wiki.
> To compile this driver as a module, choose M here.
>
> +config DRM_PIXPAPER
> + tristate "DRM support for PIXPAPER display panels"
> + depends on DRM && SPI
> + select DRM_CLIENT_SELECTION
> + select DRM_GEM_DMA_HELPER
> + select DRM_KMS_HELPER
> + help
> + DRM driver for the Mayqueen Pixpaper e-ink display panel.
> +
> + This driver supports small e-paper displays connected over SPI,
> + with a resolution of 122x250 and XRGB8888 framebuffer format.
> + It is intended for low-power embedded applications.
> +
> + If M is selected, the module will be built as pixpaper.ko.
> +
> config TINYDRM_HX8357D
> tristate "DRM support for HX8357D display panels"
> depends on DRM && SPI
> diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
> index 4a9ff61ec25420e2c0a648c04eaab7ca25dd5407..48d30bf6152f979404ac1004174587823a30109e 100644
> --- a/drivers/gpu/drm/tiny/Makefile
> +++ b/drivers/gpu/drm/tiny/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs.o
> obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus-qemu.o
> obj-$(CONFIG_DRM_GM12U320) += gm12u320.o
> obj-$(CONFIG_DRM_PANEL_MIPI_DBI) += panel-mipi-dbi.o
> +obj-$(CONFIG_DRM_PIXPAPER) += pixpaper.o
> obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o
> obj-$(CONFIG_TINYDRM_ILI9163) += ili9163.o
> obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o
> diff --git a/drivers/gpu/drm/tiny/pixpaper.c b/drivers/gpu/drm/tiny/pixpaper.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..80ac8af1ba280483d3d210f10f5143441764ee94
> --- /dev/null
> +++ b/drivers/gpu/drm/tiny/pixpaper.c
> @@ -0,0 +1,1171 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * DRM driver for PIXPAPER e-ink panel
> + *
> + * Author: LiangCheng Wang <zaq14760@...il.com>,
> + */
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/spi/spi.h>
> +
> +#include <drm/clients/drm_client_setup.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fbdev_shmem.h>
> +#include <drm/drm_framebuffer.h>
> +#include <drm/drm_gem_atomic_helper.h>
> +#include <drm/drm_gem_shmem_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_probe_helper.h>
> +
> +/*
> + * Note on Undocumented Commands/Registers:
> + *
> + * Several commands and register parameters defined in this header are not
> + * documented in the datasheet. Their values and usage have been derived
> + * through analysis of existing userspace example programs.
> + *
> + * These 'unknown' definitions are crucial for the proper initialization
> + * and stable operation of the panel. Modifying these values without
> + * thorough understanding may lead to display anomalies, panel damage,
> + * or unexpected behavior.
> + */
> +
> +/* Command definitions */
> +#define PIXPAPER_CMD_PANEL_SETTING 0x00 /* R00H: Panel settings */
> +#define PIXPAPER_CMD_POWER_SETTING 0x01 /* R01H: Power settings */
> +#define PIXPAPER_CMD_POWER_OFF 0x02 /* R02H: Power off */
> +#define PIXPAPER_CMD_POWER_OFF_SEQUENCE 0x03 /* R03H: Power off sequence */
> +#define PIXPAPER_CMD_POWER_ON 0x04 /* R04H: Power on */
> +#define PIXPAPER_CMD_BOOSTER_SOFT_START 0x06 /* R06H: Booster soft start */
> +#define PIXPAPER_CMD_DEEP_SLEEP 0x07 /* R07H: Deep sleep */
> +#define PIXPAPER_CMD_DATA_START_TRANSMISSION 0x10
> +/* R10H: Data transmission start */
> +#define PIXPAPER_CMD_DISPLAY_REFRESH 0x12 /* R12H: Display refresh */
> +#define PIXPAPER_CMD_PLL_CONTROL 0x30 /* R30H: PLL control */
> +#define PIXPAPER_CMD_TEMP_SENSOR_CALIB 0x41
> +/* R41H: Temperature sensor calibration */
> +#define PIXPAPER_CMD_UNKNOWN_4D 0x4D /* R4DH: Unknown command */
> +#define PIXPAPER_CMD_VCOM_INTERVAL 0x50 /* R50H: VCOM interval */
> +#define PIXPAPER_CMD_UNKNOWN_60 0x60 /* R60H: Unknown command */
> +#define PIXPAPER_CMD_RESOLUTION_SETTING 0x61 /* R61H: Resolution settings */
> +#define PIXPAPER_CMD_GATE_SOURCE_START 0x65 /* R65H: Gate/source start */
> +#define PIXPAPER_CMD_UNKNOWN_B4 0xB4 /* RB4H: Unknown command */
> +#define PIXPAPER_CMD_UNKNOWN_B5 0xB5 /* RB5H: Unknown command */
> +#define PIXPAPER_CMD_UNKNOWN_E0 0xE0 /* RE0H: Unknown command */
> +#define PIXPAPER_CMD_POWER_SAVING 0xE3 /* RE3H: Power saving */
> +#define PIXPAPER_CMD_UNKNOWN_E7 0xE7 /* RE7H: Unknown command */
> +#define PIXPAPER_CMD_UNKNOWN_E9 0xE9 /* RE9H: Unknown command */
> +
> +/* R00H PSR - First Parameter */
> +#define PIXPAPER_PSR_RST_N BIT(0)
> +/* Bit 0: RST_N, 1=no effect (default), 0=reset with booster OFF */
> +#define PIXPAPER_PSR_SHD_N BIT(1)
> +/* Bit 1: SHD_N, 1=booster ON (default), 0=booster OFF */
> +#define PIXPAPER_PSR_SHL BIT(2)
> +/* Bit 2: SHL, 1=shift right (default), 0=shift left */
> +#define PIXPAPER_PSR_UD BIT(3)
> +/* Bit 3: UD, 1=scan up (default), 0=scan down */
> +#define PIXPAPER_PSR_PST_MODE BIT(5)
> +/* Bit 5: PST_MODE, 0=frame scanning (default), 1=external */
> +#define PIXPAPER_PSR_RES_MASK (3 << 6)
> +/* Bits 7-6: RES[1:0], resolution setting */
> +#define PIXPAPER_PSR_RES_176x296 (0x0 << 6) /* 00: 176x296 */
> +#define PIXPAPER_PSR_RES_128x296 (0x1 << 6) /* 01: 128x296 */
> +#define PIXPAPER_PSR_RES_128x250 (0x2 << 6) /* 10: 128x250 */
> +#define PIXPAPER_PSR_RES_112x204 (0x3 << 6) /* 11: 112x204 */
> +#define PIXPAPER_PSR_CONFIG \
> + (PIXPAPER_PSR_RST_N | PIXPAPER_PSR_SHD_N | PIXPAPER_PSR_SHL | \
> + PIXPAPER_PSR_UD)
> +/* 0x0F: Default settings, resolution set by R61H */
> +
> +/* R00H PSR - Second Parameter */
> +#define PIXPAPER_PSR2_VC_LUTZ \
> + (1 << 0) /* Bit 0: VC_LUTZ, 1=VCOM float after refresh (default), 0=no effect */
> +#define PIXPAPER_PSR2_NORG \
> + (1 << 1) /* Bit 1: NORG, 1=VCOM to GND before power off, 0=no effect (default) */
> +#define PIXPAPER_PSR2_TIEG \
> + (1 << 2) /* Bit 2: TIEG, 1=VGN to GND on power off, 0=no effect (default) */
> +#define PIXPAPER_PSR2_TS_AUTO \
> + (1 << 3) /* Bit 3: TS_AUTO, 1=sensor on RST_N low to high (default), 0=on booster */
> +#define PIXPAPER_PSR2_VCMZ \
> + (1 << 4) /* Bit 4: VCMZ, 1=VCOM always floating, 0=no effect (default) */
> +#define PIXPAPER_PSR2_FOPT \
> + (1 << 5) /* Bit 5: FOPT, 0=scan 1 frame (default), 1=no scan, HiZ */
> +#define PIXPAPER_PSR_CONFIG2 \
> + (PIXPAPER_PSR2_VC_LUTZ | \
> + PIXPAPER_PSR2_TS_AUTO) /* 0x09: Default VCOM and temp sensor settings */
> +
> +/* R01H PWR - Power Setting Register */
> +/* First Parameter */
> +#define PIXPAPER_PWR_VDG_EN \
> + (1 << 0) /* Bit 0: VDG_EN, 1=internal DCDC for VGP/VGN (default), 0=external */
> +#define PIXPAPER_PWR_VDS_EN \
> + (1 << 1) /* Bit 1: VDS_EN, 1=internal regulator for VSP/VSN (default), 0=external */
> +#define PIXPAPER_PWR_VSC_EN \
> + (1 << 2) /* Bit 2: VSC_EN, 1=internal regulator for VSPL (default), 0=external */
> +#define PIXPAPER_PWR_V_MODE \
> + (1 << 3) /* Bit 3: V_MODE, 0=Mode0 (default), 1=Mode1 */
> +#define PIXPAPER_PWR_CONFIG1 \
> + (PIXPAPER_PWR_VDG_EN | PIXPAPER_PWR_VDS_EN | \
> + PIXPAPER_PWR_VSC_EN) /* 0x07: Internal power for VGP/VGN, VSP/VSN, VSPL */
> +
> +/* Second Parameter */
> +#define PIXPAPER_PWR_VGPN_MASK \
> + (3 << 0) /* Bits 1-0: VGPN, VGP/VGN voltage levels */
> +#define PIXPAPER_PWR_VGPN_20V (0x0 << 0) /* 00: VGP=20V, VGN=-20V (default) */
> +#define PIXPAPER_PWR_VGPN_17V (0x1 << 0) /* 01: VGP=17V, VGN=-17V */
> +#define PIXPAPER_PWR_VGPN_15V (0x2 << 0) /* 10: VGP=15V, VGN=-15V */
> +#define PIXPAPER_PWR_VGPN_10V (0x3 << 0) /* 11: VGP=10V, VGN=-10V */
> +#define PIXPAPER_PWR_CONFIG2 PIXPAPER_PWR_VGPN_20V /* 0x00: VGP=20V, VGN=-20V */
> +
> +/* Third, Fourth, Sixth Parameters (VSP_1, VSPL_0, VSPL_1) */
> +#define PIXPAPER_PWR_VSP_8_2V 0x22 /* VSP_1/VSPL_1: 8.2V (34 decimal) */
> +#define PIXPAPER_PWR_VSPL_15V 0x78 /* VSPL_0: 15V (120 decimal) */
> +
> +/* Fifth Parameter (VSN_1) */
> +#define PIXPAPER_PWR_VSN_4V 0x0A /* VSN_1: -4V (10 decimal) */
> +
> +/* R03H PFS - Power Off Sequence Setting Register */
> +/* First Parameter */
> +#define PIXPAPER_PFS_T_VDS_OFF_MASK \
> + (3 << 0) /* Bits 1-0: T_VDS_OFF, VSP/VSN power-off sequence */
> +#define PIXPAPER_PFS_T_VDS_OFF_20MS (0x0 << 0) /* 00: 20 ms (default) */
> +#define PIXPAPER_PFS_T_VDS_OFF_40MS (0x1 << 0) /* 01: 40 ms */
> +#define PIXPAPER_PFS_T_VDS_OFF_60MS (0x2 << 0) /* 10: 60 ms */
> +#define PIXPAPER_PFS_T_VDS_OFF_80MS (0x3 << 0) /* 11: 80 ms */
> +#define PIXPAPER_PFS_T_VDPG_OFF_MASK \
> + (3 << 4) /* Bits 5-4: T_VDPG_OFF, VGP/VGN power-off sequence */
> +#define PIXPAPER_PFS_T_VDPG_OFF_20MS (0x0 << 4) /* 00: 20 ms (default) */
> +#define PIXPAPER_PFS_T_VDPG_OFF_40MS (0x1 << 4) /* 01: 40 ms */
> +#define PIXPAPER_PFS_T_VDPG_OFF_60MS (0x2 << 4) /* 10: 60 ms */
> +#define PIXPAPER_PFS_T_VDPG_OFF_80MS (0x3 << 4) /* 11: 80 ms */
> +#define PIXPAPER_PFS_CONFIG1 \
> + (PIXPAPER_PFS_T_VDS_OFF_20MS | \
> + PIXPAPER_PFS_T_VDPG_OFF_20MS) /* 0x10: Default 20 ms for VSP/VSN and VGP/VGN */
> +
> +/* Second Parameter */
> +#define PIXPAPER_PFS_VGP_EXT_MASK \
> + (0xF << 0) /* Bits 3-0: VGP_EXT, VGP extension time */
> +#define PIXPAPER_PFS_VGP_EXT_0MS (0x0 << 0) /* 0000: 0 ms */
> +#define PIXPAPER_PFS_VGP_EXT_500MS (0x1 << 0) /* 0001: 500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_1000MS (0x2 << 0) /* 0010: 1000 ms */
> +#define PIXPAPER_PFS_VGP_EXT_1500MS (0x3 << 0) /* 0011: 1500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
> +#define PIXPAPER_PFS_VGP_EXT_2500MS (0x5 << 0) /* 0101: 2500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_3000MS (0x6 << 0) /* 0110: 3000 ms */
> +#define PIXPAPER_PFS_VGP_EXT_3500MS (0x7 << 0) /* 0111: 3500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_4000MS (0x8 << 0) /* 1000: 4000 ms */
> +#define PIXPAPER_PFS_VGP_EXT_4500MS (0x9 << 0) /* 1001: 4500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_5000MS (0xA << 0) /* 1010: 5000 ms */
> +#define PIXPAPER_PFS_VGP_EXT_5500MS (0xB << 0) /* 1011: 5500 ms */
> +#define PIXPAPER_PFS_VGP_EXT_6000MS (0xC << 0) /* 1100: 6000 ms */
> +#define PIXPAPER_PFS_VGP_EXT_6500MS (0xD << 0) /* 1101: 6500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_MASK \
> + (0xF << 4) /* Bits 7-4: VGP_LEN, VGP at 10V during power-off */
> +#define PIXPAPER_PFS_VGP_LEN_0MS (0x0 << 4) /* 0000: 0 ms */
> +#define PIXPAPER_PFS_VGP_LEN_500MS (0x1 << 4) /* 0001: 500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_1000MS (0x2 << 4) /* 0010: 1000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_1500MS (0x3 << 4) /* 0011: 1500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_2000MS (0x4 << 4) /* 0100: 2000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_2500MS (0x5 << 4) /* 0101: 2500 ms (default) */
> +#define PIXPAPER_PFS_VGP_LEN_3000MS (0x6 << 4) /* 0110: 3000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_3500MS (0x7 << 4) /* 0111: 3500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_4000MS (0x8 << 4) /* 1000: 4000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_4500MS (0x9 << 4) /* 1001: 4500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_5000MS (0xA << 4) /* 1010: 5000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_5500MS (0xB << 4) /* 1011: 5500 ms */
> +#define PIXPAPER_PFS_VGP_LEN_6000MS (0xC << 4) /* 1100: 6000 ms */
> +#define PIXPAPER_PFS_VGP_LEN_6500MS (0xD << 4) /* 1101: 6500 ms */
> +#define PIXPAPER_PFS_CONFIG2 \
> + (PIXPAPER_PFS_VGP_EXT_1000MS | \
> + PIXPAPER_PFS_VGP_LEN_2500MS) /* 0x54: VGP extension 1000 ms, VGP at 10V for 2500 ms */
> +
> +/* Third Parameter */
> +#define PIXPAPER_PFS_XON_LEN_MASK \
> + (0xF << 0) /* Bits 3-0: XON_LEN, XON enable time */
> +#define PIXPAPER_PFS_XON_LEN_0MS (0x0 << 0) /* 0000: 0 ms */
> +#define PIXPAPER_PFS_XON_LEN_500MS (0x1 << 0) /* 0001: 500 ms */
> +#define PIXPAPER_PFS_XON_LEN_1000MS (0x2 << 0) /* 0010: 1000 ms */
> +#define PIXPAPER_PFS_XON_LEN_1500MS (0x3 << 0) /* 0011: 1500 ms */
> +#define PIXPAPER_PFS_XON_LEN_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */
> +#define PIXPAPER_PFS_XON_LEN_2500MS (0x5 << 0) /* 0101: 2500 ms */
> +#define PIXPAPER_PFS_XON_LEN_3000MS (0x6 << 0) /* 0110: 3000 ms */
> +#define PIXPAPER_PFS_XON_LEN_3500MS (0x7 << 0) /* 0111: 3500 ms */
> +#define PIXPAPER_PFS_XON_LEN_4000MS (0x8 << 0) /* 1000: 4000 ms */
> +#define PIXPAPER_PFS_XON_LEN_4500MS (0x9 << 0) /* 1001: 4500 ms */
> +#define PIXPAPER_PFS_XON_LEN_5000MS (0xA << 0) /* 1010: 5000 ms */
> +#define PIXPAPER_PFS_XON_LEN_5500MS (0xB << 0) /* 1011: 5500 ms */
> +#define PIXPAPER_PFS_XON_LEN_6000MS (0xC << 0) /* 1100: 6000 ms */
> +#define PIXPAPER_PFS_XON_DLY_MASK \
> + (0xF << 4) /* Bits 7-4: XON_DLY, XON delay time */
> +#define PIXPAPER_PFS_XON_DLY_0MS (0x0 << 4) /* 0000: 0 ms */
> +#define PIXPAPER_PFS_XON_DLY_500MS (0x1 << 4) /* 0001: 500 ms */
> +#define PIXPAPER_PFS_XON_DLY_1000MS (0x2 << 4) /* 0010: 1000 ms */
> +#define PIXPAPER_PFS_XON_DLY_1500MS (0x3 << 4) /* 0011: 1500 ms */
> +#define PIXPAPER_PFS_XON_DLY_2000MS (0x4 << 4) /* 0100: 2000 ms (default) */
> +#define PIXPAPER_PFS_XON_DLY_2500MS (0x5 << 4) /* 0101: 2500 ms */
> +#define PIXPAPER_PFS_XON_DLY_3000MS (0x6 << 4) /* 0110: 3000 ms */
> +#define PIXPAPER_PFS_XON_DLY_3500MS (0x7 << 4) /* 0111: 3500 ms */
> +#define PIXPAPER_PFS_XON_DLY_4000MS (0x8 << 4) /* 1000: 4000 ms */
> +#define PIXPAPER_PFS_XON_DLY_4500MS (0x9 << 4) /* 1001: 4500 ms */
> +#define PIXPAPER_PFS_XON_DLY_5000MS (0xA << 4) /* 1010: 5000 ms */
> +#define PIXPAPER_PFS_XON_DLY_5500MS (0xB << 4) /* 1011: 5500 ms */
> +#define PIXPAPER_PFS_XON_DLY_6000MS (0xC << 4) /* 1100: 6000 ms */
> +#define PIXPAPER_PFS_CONFIG3 \
> + (PIXPAPER_PFS_XON_LEN_2000MS | \
> + PIXPAPER_PFS_XON_DLY_2000MS) /* 0x44: XON enable and delay at 2000 ms */
> +
> +/* R06H BTST - Booster Soft Start Command */
> +/* First Parameter */
> +#define PIXPAPER_BTST_PHA_SFT_MASK \
> + (3 << 0) /* Bits 1-0: PHA_SFT, soft start period for phase A */
> +#define PIXPAPER_BTST_PHA_SFT_10MS (0x0 << 0) /* 00: 10 ms (default) */
> +#define PIXPAPER_BTST_PHA_SFT_20MS (0x1 << 0) /* 01: 20 ms */
> +#define PIXPAPER_BTST_PHA_SFT_30MS (0x2 << 0) /* 10: 30 ms */
> +#define PIXPAPER_BTST_PHA_SFT_40MS (0x3 << 0) /* 11: 40 ms */
> +#define PIXPAPER_BTST_PHB_SFT_MASK \
> + (3 << 2) /* Bits 3-2: PHB_SFT, soft start period for phase B */
> +#define PIXPAPER_BTST_PHB_SFT_10MS (0x0 << 2) /* 00: 10 ms (default) */
> +#define PIXPAPER_BTST_PHB_SFT_20MS (0x1 << 2) /* 01: 20 ms */
> +#define PIXPAPER_BTST_PHB_SFT_30MS (0x2 << 2) /* 10: 30 ms */
> +#define PIXPAPER_BTST_PHB_SFT_40MS (0x3 << 2) /* 11: 40 ms */
> +#define PIXPAPER_BTST_CONFIG1 \
> + (PIXPAPER_BTST_PHA_SFT_40MS | \
> + PIXPAPER_BTST_PHB_SFT_40MS) /* 0x0F: 40 ms for phase A and B */
> +
> +/* Second to Seventh Parameters (Driving Strength or Minimum OFF Time) */
> +#define PIXPAPER_BTST_CONFIG2 0x0A /* Strength11 */
> +#define PIXPAPER_BTST_CONFIG3 0x2F /* Period48 */
> +#define PIXPAPER_BTST_CONFIG4 0x25 /* Strength38 */
> +#define PIXPAPER_BTST_CONFIG5 0x22 /* Period35 */
> +#define PIXPAPER_BTST_CONFIG6 0x2E /* Strength47 */
> +#define PIXPAPER_BTST_CONFIG7 0x21 /* Period34 */
> +
> +/* R12H: DRF (Display Refresh) */
> +#define PIXPAPER_DRF_VCOM_AC 0x00 /* AC VCOM: VCOM follows LUTC (default) */
> +#define PIXPAPER_DRF_VCOM_DC 0x01 /* DC VCOM: VCOM fixed to VCOMDC */
> +
> +/* R30H PLL - PLL Control Register */
> +/* First Parameter */
> +#define PIXPAPER_PLL_FR_MASK (0x7 << 0) /* Bits 2-0: FR, frame rate */
> +#define PIXPAPER_PLL_FR_12_5HZ (0x0 << 0) /* 000: 12.5 Hz */
> +#define PIXPAPER_PLL_FR_25HZ (0x1 << 0) /* 001: 25 Hz */
> +#define PIXPAPER_PLL_FR_50HZ (0x2 << 0) /* 010: 50 Hz (default) */
> +#define PIXPAPER_PLL_FR_65HZ (0x3 << 0) /* 011: 65 Hz */
> +#define PIXPAPER_PLL_FR_75HZ (0x4 << 0) /* 100: 75 Hz */
> +#define PIXPAPER_PLL_FR_85HZ (0x5 << 0) /* 101: 85 Hz */
> +#define PIXPAPER_PLL_FR_100HZ (0x6 << 0) /* 110: 100 Hz */
> +#define PIXPAPER_PLL_FR_120HZ (0x7 << 0) /* 111: 120 Hz */
> +#define PIXPAPER_PLL_DFR \
> + (1 << 3) /* Bit 3: Dynamic frame rate, 0=disabled (default), 1=enabled */
> +#define PIXPAPER_PLL_CONFIG \
> + (PIXPAPER_PLL_FR_50HZ) /* 0x02: 50 Hz, dynamic frame rate disabled */
> +
> +/* R41H TSE - Temperature Sensor Calibration Register */
> +/* First Parameter */
> +#define PIXPAPER_TSE_TO_MASK \
> + (0xF << 0) /* Bits 3-0: TO[3:0], temperature offset */
> +#define PIXPAPER_TSE_TO_POS_0C (0x0 << 0) /* 0000: +0°C (default) */
> +#define PIXPAPER_TSE_TO_POS_0_5C (0x1 << 0) /* 0001: +0.5°C */
> +#define PIXPAPER_TSE_TO_POS_1C (0x2 << 0) /* 0010: +1°C */
> +#define PIXPAPER_TSE_TO_POS_1_5C (0x3 << 0) /* 0011: +1.5°C */
> +#define PIXPAPER_TSE_TO_POS_2C (0x4 << 0) /* 0100: +2°C */
> +#define PIXPAPER_TSE_TO_POS_2_5C (0x5 << 0) /* 0101: +2.5°C */
> +#define PIXPAPER_TSE_TO_POS_3C (0x6 << 0) /* 0110: +3°C */
> +#define PIXPAPER_TSE_TO_POS_3_5C (0x7 << 0) /* 0111: +3.5°C */
> +#define PIXPAPER_TSE_TO_NEG_4C (0x8 << 0) /* 1000: -4°C */
> +#define PIXPAPER_TSE_TO_NEG_3_5C (0x9 << 0) /* 1001: -3.5°C */
> +#define PIXPAPER_TSE_TO_NEG_3C (0xA << 0) /* 1010: -3°C */
> +#define PIXPAPER_TSE_TO_NEG_2_5C (0xB << 0) /* 1011: -2.5°C */
> +#define PIXPAPER_TSE_TO_NEG_2C (0xC << 0) /* 1100: -2°C */
> +#define PIXPAPER_TSE_TO_NEG_1_5C (0xD << 0) /* 1101: -1.5°C */
> +#define PIXPAPER_TSE_TO_NEG_1C (0xE << 0) /* 1110: -1°C */
> +#define PIXPAPER_TSE_TO_NEG_0_5C (0xF << 0) /* 1111: -0.5°C */
> +#define PIXPAPER_TSE_TO_FINE_MASK \
> + (0x3 << 4) /* Bits 5-4: TO[5:4], fine adjustment for positive offsets */
> +#define PIXPAPER_TSE_TO_FINE_0C (0x0 << 4) /* 00: +0.0°C (default) */
> +#define PIXPAPER_TSE_TO_FINE_0_25C (0x1 << 4) /* 01: +0.25°C */
> +#define PIXPAPER_TSE_ENABLE \
> + (0 << 7) /* Bit 7: TSE, 0=internal sensor enabled (default), 1=disabled (external) */
> +#define PIXPAPER_TSE_DISABLE \
> + (1 << 7) /* Bit 7: TSE, 1=internal sensor disabled, use external */
> +#define PIXPAPER_TSE_CONFIG \
> + (PIXPAPER_TSE_TO_POS_0C | PIXPAPER_TSE_TO_FINE_0C | \
> + PIXPAPER_TSE_ENABLE) /* 0x00: Internal sensor enabled, +0°C offset */
> +
> +/* R4DH */
> +#define PIXPAPER_UNKNOWN_4D_CONFIG \
> + 0x78 /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* R50H CDI - VCOM and DATA Interval Setting Register */
> +/* First Parameter */
> +#define PIXPAPER_CDI_INTERVAL_MASK \
> + (0xF << 0) /* Bits 3-0: CDI[3:0], VCOM and data interval (hsync) */
> +#define PIXPAPER_CDI_17_HSYNC (0x0 << 0) /* 0000: 17 hsync */
> +#define PIXPAPER_CDI_16_HSYNC (0x1 << 0) /* 0001: 16 hsync */
> +#define PIXPAPER_CDI_15_HSYNC (0x2 << 0) /* 0010: 15 hsync */
> +#define PIXPAPER_CDI_14_HSYNC (0x3 << 0) /* 0011: 14 hsync */
> +#define PIXPAPER_CDI_13_HSYNC (0x4 << 0) /* 0100: 13 hsync */
> +#define PIXPAPER_CDI_12_HSYNC (0x5 << 0) /* 0101: 12 hsync */
> +#define PIXPAPER_CDI_11_HSYNC (0x6 << 0) /* 0110: 11 hsync */
> +#define PIXPAPER_CDI_10_HSYNC (0x7 << 0) /* 0111: 10 hsync (default) */
> +#define PIXPAPER_CDI_9_HSYNC (0x8 << 0) /* 1000: 9 hsync */
> +#define PIXPAPER_CDI_8_HSYNC (0x9 << 0) /* 1001: 8 hsync */
> +#define PIXPAPER_CDI_7_HSYNC (0xA << 0) /* 1010: 7 hsync */
> +#define PIXPAPER_CDI_6_HSYNC (0xB << 0) /* 1011: 6 hsync */
> +#define PIXPAPER_CDI_5_HSYNC (0xC << 0) /* 1100: 5 hsync */
> +#define PIXPAPER_CDI_4_HSYNC (0xD << 0) /* 1101: 4 hsync */
> +#define PIXPAPER_CDI_3_HSYNC (0xE << 0) /* 1110: 3 hsync */
> +#define PIXPAPER_CDI_2_HSYNC (0xF << 0) /* 1111: 2 hsync */
> +#define PIXPAPER_CDI_DDX \
> + (1 << 4) /* Bit 4: DDX, 0=grayscale mapping 0, 1=grayscale mapping 1 (default) */
> +#define PIXPAPER_CDI_VBD_MASK \
> + (0x7 << 5) /* Bits 7-5: VBD[2:0], border data selection */
> +#define PIXPAPER_CDI_VBD_FLOAT (0x0 << 5) /* 000: Floating (DDX=0 or 1) */
> +#define PIXPAPER_CDI_VBD_GRAY3_DDX0 \
> + (0x1 << 5) /* 001: Gray3 (border_buf=011) when DDX=0 */
> +#define PIXPAPER_CDI_VBD_GRAY2_DDX0 \
> + (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=0 */
> +#define PIXPAPER_CDI_VBD_GRAY1_DDX0 \
> + (0x3 << 5) /* 011: Gray1 (border_buf=001) when DDX=0 */
> +#define PIXPAPER_CDI_VBD_GRAY0_DDX0 \
> + (0x4 << 5) /* 100: Gray0 (border_buf=000) when DDX=0 */
> +#define PIXPAPER_CDI_VBD_GRAY0_DDX1 \
> + (0x0 << 5) /* 000: Gray0 (border_buf=000) when DDX=1 */
> +#define PIXPAPER_CDI_VBD_GRAY1_DDX1 \
> + (0x1 << 5) /* 001: Gray1 (border_buf=001) when DDX=1 */
> +#define PIXPAPER_CDI_VBD_GRAY2_DDX1 \
> + (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=1 */
> +#define PIXPAPER_CDI_VBD_GRAY3_DDX1 \
> + (0x3 << 5) /* 011: Gray3 (border_buf=011) when DDX=1 */
> +#define PIXPAPER_CDI_VBD_FLOAT_DDX1 (0x4 << 5) /* 100: Floating when DDX=1 */
> +#define PIXPAPER_CDI_CONFIG \
> + (PIXPAPER_CDI_10_HSYNC | PIXPAPER_CDI_DDX | \
> + PIXPAPER_CDI_VBD_GRAY1_DDX1) /* 0x37: 10 hsync, DDX=1, border Gray1 */
> +
> +/* R60H */
> +#define PIXPAPER_UNKNOWN_60_CONFIG1 \
> + 0x02 /* This value is essential for initialization, derived from userspace examples. */
> +#define PIXPAPER_UNKNOWN_60_CONFIG2 \
> + 0x02 /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* R61H TRES - Resolution Setting Register */
> +#define PIXPAPER_TRES_HRES_H \
> + ((PIXPAPER_PANEL_BUFFER_WIDTH >> 8) & \
> + 0xFF) /* HRES[9:8]: High byte of horizontal resolution (128) */
> +#define PIXPAPER_TRES_HRES_L \
> + (PIXPAPER_PANEL_BUFFER_WIDTH & \
> + 0xFF) /* HRES[7:0]: Low byte of horizontal resolution (128 = 0x80) */
> +#define PIXPAPER_TRES_VRES_H \
> + ((PIXPAPER_HEIGHT >> 8) & \
> + 0xFF) /* VRES[9:8]: High byte of vertical resolution (250) */
> +#define PIXPAPER_TRES_VRES_L \
> + (PIXPAPER_HEIGHT & \
> + 0xFF) /* VRES[7:0]: Low byte of vertical resolution (250 = 0xFA) */
> +
> +/* R65H GSST - Gate/Source Start Setting Register */
> +#define PIXPAPER_GSST_S_START 0x00 /* S_Start[7:0]: First source line (S0) */
> +#define PIXPAPER_GSST_RESERVED 0x00 /* Reserved byte */
> +#define PIXPAPER_GSST_G_START_H \
> + 0x00 /* G_Start[8]: High bit of first gate line (G0) */
> +#define PIXPAPER_GSST_G_START_L \
> + 0x00 /* G_Start[7:0]: Low byte of first gate line (G0) */
> +
> +/* RB4H */
> +#define PIXPAPER_UNKNOWN_B4_CONFIG \
> + 0xD0 /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* RB5H */
> +#define PIXPAPER_UNKNOWN_B5_CONFIG \
> + 0x03 /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* RE0H */
> +#define PIXPAPER_UNKNOWN_E0_CONFIG \
> + 0x00 /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* RE3H PWS - Power Saving Register */
> +/* First Parameter */
> +#define PIXPAPER_PWS_VCOM_W_MASK \
> + (0xF \
> + << 4) /* Bits 7-4: VCOM_W[3:0], VCOM power-saving width (line periods) */
> +#define PIXPAPER_PWS_VCOM_W_0 (0x0 << 4) /* 0000: 0 line periods */
> +#define PIXPAPER_PWS_VCOM_W_1 (0x1 << 4) /* 0001: 1 line period */
> +#define PIXPAPER_PWS_VCOM_W_2 (0x2 << 4) /* 0010: 2 line periods */
> +#define PIXPAPER_PWS_VCOM_W_3 (0x3 << 4) /* 0011: 3 line periods */
> +#define PIXPAPER_PWS_VCOM_W_4 (0x4 << 4) /* 0100: 4 line periods */
> +#define PIXPAPER_PWS_VCOM_W_5 (0x5 << 4) /* 0101: 5 line periods */
> +#define PIXPAPER_PWS_VCOM_W_6 (0x6 << 4) /* 0110: 6 line periods */
> +#define PIXPAPER_PWS_VCOM_W_7 (0x7 << 4) /* 0111: 7 line periods */
> +#define PIXPAPER_PWS_VCOM_W_8 (0x8 << 4) /* 1000: 8 line periods */
> +#define PIXPAPER_PWS_VCOM_W_9 (0x9 << 4) /* 1001: 9 line periods */
> +#define PIXPAPER_PWS_VCOM_W_10 (0xA << 4) /* 1010: 10 line periods */
> +#define PIXPAPER_PWS_VCOM_W_11 (0xB << 4) /* 1011: 11 line periods */
> +#define PIXPAPER_PWS_VCOM_W_12 (0xC << 4) /* 1100: 12 line periods */
> +#define PIXPAPER_PWS_VCOM_W_13 (0xD << 4) /* 1101: 13 line periods */
> +#define PIXPAPER_PWS_VCOM_W_14 (0xE << 4) /* 1110: 14 line periods */
> +#define PIXPAPER_PWS_VCOM_W_15 (0xF << 4) /* 1111: 15 line periods */
> +#define PIXPAPER_PWS_SD_W_MASK \
> + (0xF << 0) /* Bits 3-0: SD_W[3:0], source power-saving width (660 ns units) */
> +#define PIXPAPER_PWS_SD_W_0 (0x0 << 0) /* 0000: 0 ns */
> +#define PIXPAPER_PWS_SD_W_1 (0x1 << 0) /* 0001: 660 ns */
> +#define PIXPAPER_PWS_SD_W_2 (0x2 << 0) /* 0010: 1320 ns */
> +#define PIXPAPER_PWS_SD_W_3 (0x3 << 0) /* 0011: 1980 ns */
> +#define PIXPAPER_PWS_SD_W_4 (0x4 << 0) /* 0100: 2640 ns */
> +#define PIXPAPER_PWS_SD_W_5 (0x5 << 0) /* 0101: 3300 ns */
> +#define PIXPAPER_PWS_SD_W_6 (0x6 << 0) /* 0110: 3960 ns */
> +#define PIXPAPER_PWS_SD_W_7 (0x7 << 0) /* 0111: 4620 ns */
> +#define PIXPAPER_PWS_SD_W_8 (0x8 << 0) /* 1000: 5280 ns */
> +#define PIXPAPER_PWS_SD_W_9 (0x9 << 0) /* 1001: 5940 ns */
> +#define PIXPAPER_PWS_SD_W_10 (0xA << 0) /* 1010: 6600 ns */
> +#define PIXPAPER_PWS_SD_W_11 (0xB << 0) /* 1011: 7260 ns */
> +#define PIXPAPER_PWS_SD_W_12 (0xC << 0) /* 1100: 7920 ns */
> +#define PIXPAPER_PWS_SD_W_13 (0xD << 0) /* 1101: 8580 ns */
> +#define PIXPAPER_PWS_SD_W_14 (0xE << 0) /* 1110: 9240 ns */
> +#define PIXPAPER_PWS_SD_W_15 (0xF << 0) /* 1111: 9900 ns */
> +#define PIXPAPER_PWS_CONFIG \
> + (PIXPAPER_PWS_VCOM_W_2 | \
> + PIXPAPER_PWS_SD_W_2) /* 0x22: VCOM 2 line periods (160 µs), source 1320 ns */
> +
> +/* RE7H */
> +#define PIXPAPER_UNKNOWN_E7_CONFIG \
> + 0x1C /* This value is essential for initialization, derived from userspace examples. */
> +
> +/* RE9H */
> +#define PIXPAPER_UNKNOWN_E9_CONFIG \
> + 0x01 /* This value is essential for initialization, derived from userspace examples. */
> +
> +MODULE_IMPORT_NS("DMA_BUF");
> +
> +/*
> + * The panel has a visible resolution of 122x250.
> + * However, the controller requires the horizontal resolution to be aligned to 128 pixels.
> + * No porch or sync timing values are provided in the datasheet, so we define minimal
> + * placeholder values to satisfy the DRM framework.
> + */
> +
> +/* Panel visible resolution */
> +#define PIXPAPER_WIDTH 122
> +#define PIXPAPER_HEIGHT 250
> +
> +/* Controller requires 128 horizontal pixels total (for memory alignment) */
> +#define PIXPAPER_HTOTAL 128
> +#define PIXPAPER_HFP 2
> +#define PIXPAPER_HSYNC 2
> +#define PIXPAPER_HBP (PIXPAPER_HTOTAL - PIXPAPER_WIDTH - PIXPAPER_HFP - PIXPAPER_HSYNC)
> +
> +/*
> + * According to the datasheet, the total vertical blanking must be 55 lines,
> + * regardless of how the vertical back porch is set.
> + * Here we allocate VFP=2, VSYNC=2, and VBP=51 to sum up to 55 lines.
> + * Total vertical lines = 250 (visible) + 55 (blanking) = 305.
> + */
> +#define PIXPAPER_VTOTAL (250 + 55)
> +#define PIXPAPER_VFP 2
> +#define PIXPAPER_VSYNC 2
> +#define PIXPAPER_VBP (55 - PIXPAPER_VFP - PIXPAPER_VSYNC)
> +
> +/*
> + * Pixel clock calculation:
> + * pixel_clock = htotal * vtotal * refresh_rate
> + * = 128 * 305 * 50
> + * = 1,952,000 Hz = 1952 kHz
> + */
> +#define PIXPAPER_PIXEL_CLOCK 1952
> +
> +#define PIXPAPER_WIDTH_MM 24 /* approximate from 23.7046mm */
> +#define PIXPAPER_HEIGHT_MM 49 /* approximate from 48.55mm */
> +
> +#define PIXPAPER_SPI_BITS_PER_WORD 8
> +#define PIXPAPER_SPI_SPEED_DEFAULT 1000000
> +
> +#define PIXPAPER_PANEL_BUFFER_WIDTH 128
> +#define PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW (PIXPAPER_PANEL_BUFFER_WIDTH / 4)
> +
> +#define PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL 60
> +#define PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL 200
> +#define PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN 180
> +
> +struct pixpaper_error_ctx {
> + int errno_code;
> +};
> +
> +struct pixpaper_panel {
> + struct drm_device drm;
> + struct drm_plane plane;
> + struct drm_crtc crtc;
> + struct drm_encoder encoder;
> + struct drm_connector connector;
> +
> + struct spi_device *spi;
> + struct gpio_desc *reset;
> + struct gpio_desc *busy;
> + struct gpio_desc *dc;
> +};
> +
> +static inline struct pixpaper_panel *to_pixpaper_panel(struct drm_device *drm)
> +{
> + return container_of(drm, struct pixpaper_panel, drm);
> +}
> +
> +static void pixpaper_wait_for_panel(struct pixpaper_panel *panel)
> +{
> + unsigned int timeout_ms = 10000;
> + unsigned long timeout_jiffies = jiffies + msecs_to_jiffies(timeout_ms);
> +
> + usleep_range(1000, 1500);
> + while (gpiod_get_value_cansleep(panel->busy) != 1) {
> + if (time_after(jiffies, timeout_jiffies)) {
> + drm_warn(&panel->drm, "Busy wait timed out\n");
> + return;
> + }
> + usleep_range(100, 200);
> + }
> +}
> +
> +static void pixpaper_spi_sync(struct spi_device *spi, struct spi_message *msg,
> + struct pixpaper_error_ctx *err)
> +{
> + if (err->errno_code)
> + return;
> +
> + int ret = spi_sync(spi, msg);
> +
> + if (ret < 0)
> + err->errno_code = ret;
> +}
> +
> +static void pixpaper_send_cmd(struct pixpaper_panel *panel, u8 cmd,
> + struct pixpaper_error_ctx *err)
> +{
> + if (err->errno_code)
> + return;
> +
> + struct spi_transfer xfer = {
> + .tx_buf = &cmd,
> + .len = 1,
> + };
> + struct spi_message msg;
> +
> + spi_message_init(&msg);
> + spi_message_add_tail(&xfer, &msg);
> +
> + gpiod_set_value_cansleep(panel->dc, 0);
> + usleep_range(1, 5);
> + pixpaper_spi_sync(panel->spi, &msg, err);
> +}
> +
> +static void pixpaper_send_data(struct pixpaper_panel *panel, u8 data,
> + struct pixpaper_error_ctx *err)
> +{
> + if (err->errno_code)
> + return;
> +
> + struct spi_transfer xfer = {
> + .tx_buf = &data,
> + .len = 1,
> + };
> + struct spi_message msg;
> +
> + spi_message_init(&msg);
> + spi_message_add_tail(&xfer, &msg);
> +
> + gpiod_set_value_cansleep(panel->dc, 1);
> + usleep_range(1, 5);
> + pixpaper_spi_sync(panel->spi, &msg, err);
> +}
> +
> +static int pixpaper_panel_hw_init(struct pixpaper_panel *panel)
> +{
> + struct pixpaper_error_ctx err = { .errno_code = 0 };
> +
> + gpiod_set_value_cansleep(panel->reset, 0);
> + msleep(50);
> + gpiod_set_value_cansleep(panel->reset, 1);
> + msleep(50);
> +
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING, &err);
> + pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG, &err);
> + pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG2, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG1, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG2, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_VSPL_15V, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_VSN_4V, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE, &err);
> + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG1, &err);
> + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG2, &err);
> + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG3, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG1, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG2, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG3, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG4, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG5, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG6, &err);
> + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG7, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL, &err);
> + pixpaper_send_data(panel, PIXPAPER_PLL_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB, &err);
> + pixpaper_send_data(panel, PIXPAPER_TSE_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL, &err);
> + pixpaper_send_data(panel, PIXPAPER_CDI_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_60, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG1, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG2, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING, &err);
> + pixpaper_send_data(panel, PIXPAPER_TRES_HRES_H, &err);
> + pixpaper_send_data(panel, PIXPAPER_TRES_HRES_L, &err);
> + pixpaper_send_data(panel, PIXPAPER_TRES_VRES_H, &err);
> + pixpaper_send_data(panel, PIXPAPER_TRES_VRES_L, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START, &err);
> + pixpaper_send_data(panel, PIXPAPER_GSST_S_START, &err);
> + pixpaper_send_data(panel, PIXPAPER_GSST_RESERVED, &err);
> + pixpaper_send_data(panel, PIXPAPER_GSST_G_START_H, &err);
> + pixpaper_send_data(panel, PIXPAPER_GSST_G_START_L, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E7, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E7_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING, &err);
> + pixpaper_send_data(panel, PIXPAPER_PWS_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E0, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E0_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B4_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B5_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9, &err);
> + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E9_CONFIG, &err);
> + if (err.errno_code)
> + goto init_fail;
> + pixpaper_wait_for_panel(panel);
> +
> + return 0;
> +
> +init_fail:
> + drm_err(&panel->drm, "Hardware initialization failed (err=%d)\n",
> + err.errno_code);
> + return err.errno_code;
> +}
> +
> +/*
> + * Convert framebuffer pixels to 2-bit e-paper format:
> + * 00 - White
> + * 01 - Black
> + * 10 - Yellow
> + * 11 - Red
> + */
> +static u8 pack_pixels_to_byte(__le32 *src_pixels, int i, int j,
> + struct drm_framebuffer *fb)
> +{
> + u8 packed_byte = 0;
> + int k;
> +
> + for (k = 0; k < 4; k++) {
> + int current_pixel_x = j * 4 + k;
> + u8 two_bit_val;
> +
> + if (current_pixel_x < PIXPAPER_WIDTH) {
> + u32 pixel_offset =
> + (i * (fb->pitches[0] / 4)) + current_pixel_x;
> + u32 pixel = le32_to_cpu(src_pixels[pixel_offset]);
> + u32 r = (pixel >> 16) & 0xFF;
> + u32 g = (pixel >> 8) & 0xFF;
> + u32 b = pixel & 0xFF;
> +
> + if (r < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
> + g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
> + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
> + two_bit_val = 0b00;
> + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
> + g > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
> + b > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL) {
> + two_bit_val = 0b01;
> + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
> + g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL &&
> + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
> + two_bit_val = 0b11;
> + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL &&
> + g > PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN &&
> + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) {
> + two_bit_val = 0b10;
> + } else {
> + two_bit_val = 0b01;
> + }
> + } else {
> + two_bit_val = 0b01;
> + }
> +
> + packed_byte |= two_bit_val << ((3 - k) * 2);
> + }
> +
> + return packed_byte;
> +}
> +
> +static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane,
> + struct drm_atomic_state *state)
> +{
> + struct drm_plane_state *new_plane_state =
> + drm_atomic_get_new_plane_state(state, plane);
> + struct drm_crtc *new_crtc = new_plane_state->crtc;
> + struct drm_crtc_state *new_crtc_state = NULL;
> + int ret;
> +
> + if (new_crtc)
> + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
> +
> + ret = drm_atomic_helper_check_plane_state(new_plane_state,
> + new_crtc_state, DRM_PLANE_NO_SCALING,
> + DRM_PLANE_NO_SCALING, false, false);
> + if (ret)
> + return ret;
> + else if (!new_plane_state->visible)
> + return 0;
> +
> + return 0;
> +}
> +
> +static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc,
> + struct drm_atomic_state *state)
> +{
> + struct drm_crtc_state *crtc_state =
> + drm_atomic_get_new_crtc_state(state, crtc);
> +
> + if (!crtc_state->enable)
> + return 0;
> +
> + return drm_atomic_helper_check_crtc_primary_plane(crtc_state);
> +}
> +
> +static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc,
> + struct drm_atomic_state *state)
> +{
> + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
> + struct drm_device *drm = &panel->drm;
> + int idx;
> + struct pixpaper_error_ctx err = { .errno_code = 0 };
> +
> + if (!drm_dev_enter(drm, &idx))
> + return;
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
> + if (err.errno_code) {
> + drm_err_once(drm, "Failed to send PON command: %d\n",
> + err.errno_code);
> + goto exit_drm_dev;
> + }
> +
> + pixpaper_wait_for_panel(panel);
> +
> + drm_dbg(drm, "Panel enabled and powered on\n");
> +
> +exit_drm_dev:
> + drm_dev_exit(idx);
> +}
> +
> +static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc,
> + struct drm_atomic_state *state)
> +{
> + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
> + struct drm_device *drm = &panel->drm;
> + struct pixpaper_error_ctx err = { .errno_code = 0 };
> + int idx;
> +
> + if (!drm_dev_enter(drm, &idx))
> + return;
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF, &err);
> + if (err.errno_code) {
> + drm_err_once(drm, "Failed to send POF command: %d\n",
> + err.errno_code);
> + goto exit_drm_dev;
> + }
> + pixpaper_wait_for_panel(panel);
> +
> + drm_dbg(drm, "Panel disabled\n");
> +
> +exit_drm_dev:
> + drm_dev_exit(idx);
> +}
> +
> +static void pixpaper_plane_atomic_update(struct drm_plane *plane,
> + struct drm_atomic_state *state)
> +{
> + struct drm_plane_state *plane_state =
> + drm_atomic_get_new_plane_state(state, plane);
> + struct drm_shadow_plane_state *shadow_plane_state =
> + to_drm_shadow_plane_state(plane_state);
> + struct drm_crtc *crtc = plane_state->crtc;
> + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev);
> +
> + struct drm_device *drm = &panel->drm;
> + struct drm_framebuffer *fb = plane_state->fb;
> + struct iosys_map map = shadow_plane_state->data[0];
> + void *vaddr = map.vaddr;
> + int i, j, idx;
> + __le32 *src_pixels = NULL;
> + struct pixpaper_error_ctx err = { .errno_code = 0 };
> +
> + if (!drm_dev_enter(drm, &idx))
> + return;
> +
> + drm_dbg(drm, "Starting frame update (phys=%dx%d, buf_w=%d)\n",
> + PIXPAPER_WIDTH, PIXPAPER_HEIGHT, PIXPAPER_PANEL_BUFFER_WIDTH);
> +
> + if (!fb || !plane_state->visible) {
> + drm_err_once(drm,
> + "No framebuffer or plane not visible, skipping update\n");
> + goto update_cleanup;
> + }
> +
> + src_pixels = (__le32 *)vaddr;
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_DATA_START_TRANSMISSION, &err);
> + if (err.errno_code)
> + goto update_cleanup;
> +
> + pixpaper_wait_for_panel(panel);
> +
> + for (i = 0; i < PIXPAPER_HEIGHT; i++) {
> + for (j = 0; j < PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW; j++) {
> + u8 packed_byte =
> + pack_pixels_to_byte(src_pixels, i, j, fb);
> +
> + pixpaper_wait_for_panel(panel);
> + pixpaper_send_data(panel, packed_byte, &err);
> + }
> + }
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err);
> + if (err.errno_code) {
> + drm_err_once(drm, "Failed to send PON command: %d\n",
> + err.errno_code);
> + goto update_cleanup;
> + }
> + pixpaper_wait_for_panel(panel);
> +
> + pixpaper_send_cmd(panel, PIXPAPER_CMD_DISPLAY_REFRESH, &err);
> + pixpaper_send_data(panel, PIXPAPER_DRF_VCOM_AC, &err);
> + if (err.errno_code) {
> + drm_err_once(drm, "Failed sending data after DRF: %d\n",
> + err.errno_code);
> + goto update_cleanup;
> + }
> + pixpaper_wait_for_panel(panel);
> +
> +update_cleanup:
> + if (err.errno_code && err.errno_code != -ETIMEDOUT)
> + drm_err_once(drm, "Frame update function failed with error %d\n",
> + err.errno_code);
> +
> + drm_dev_exit(idx);
> +}
> +
> +static const struct drm_display_mode pixpaper_mode = {
> + .clock = PIXPAPER_PIXEL_CLOCK,
> + .hdisplay = PIXPAPER_WIDTH,
> + .hsync_start = PIXPAPER_WIDTH + PIXPAPER_HFP,
> + .hsync_end = PIXPAPER_WIDTH + PIXPAPER_HFP + PIXPAPER_HSYNC,
> + .htotal = PIXPAPER_HTOTAL,
> + .vdisplay = PIXPAPER_HEIGHT,
> + .vsync_start = PIXPAPER_HEIGHT + PIXPAPER_VFP,
> + .vsync_end = PIXPAPER_HEIGHT + PIXPAPER_VFP + PIXPAPER_VSYNC,
> + .vtotal = PIXPAPER_VTOTAL,
> + .width_mm = PIXPAPER_WIDTH_MM,
> + .height_mm = PIXPAPER_HEIGHT_MM,
> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> +};
> +
> +static int pixpaper_connector_get_modes(struct drm_connector *connector)
> +{
> + return drm_connector_helper_get_modes_fixed(connector, &pixpaper_mode);
> +}
> +
> +static const struct drm_plane_funcs pixpaper_plane_funcs = {
> + .update_plane = drm_atomic_helper_update_plane,
> + .disable_plane = drm_atomic_helper_disable_plane,
> + .destroy = drm_plane_cleanup,
> + DRM_GEM_SHADOW_PLANE_FUNCS,
> +};
> +
> +static const struct drm_plane_helper_funcs pixpaper_plane_helper_funcs = {
> + DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
> + .atomic_check = pixpaper_plane_helper_atomic_check,
> + .atomic_update = pixpaper_plane_atomic_update,
> +};
> +
> +static const struct drm_crtc_funcs pixpaper_crtc_funcs = {
> + .set_config = drm_atomic_helper_set_config,
> + .page_flip = drm_atomic_helper_page_flip,
> + .reset = drm_atomic_helper_crtc_reset,
> + .destroy = drm_crtc_cleanup,
> + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static int pixpaper_mode_valid(struct drm_crtc *crtc,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->hdisplay == PIXPAPER_WIDTH &&
> + mode->vdisplay == PIXPAPER_HEIGHT) {
> + return MODE_OK;
> + }
> + return MODE_BAD;
> +}
> +
> +static const struct drm_crtc_helper_funcs pixpaper_crtc_helper_funcs = {
> + .mode_valid = pixpaper_mode_valid,
> + .atomic_check = pixpaper_crtc_helper_atomic_check,
> + .atomic_enable = pixpaper_crtc_atomic_enable,
> + .atomic_disable = pixpaper_crtc_atomic_disable,
> +};
> +
> +static const struct drm_encoder_funcs pixpaper_encoder_funcs = {
> + .destroy = drm_encoder_cleanup,
> +};
> +
> +static const struct drm_connector_funcs pixpaper_connector_funcs = {
> + .reset = drm_atomic_helper_connector_reset,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = drm_connector_cleanup,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static const struct drm_connector_helper_funcs pixpaper_connector_helper_funcs = {
> + .get_modes = pixpaper_connector_get_modes,
> +};
> +
> +DEFINE_DRM_GEM_FOPS(pixpaper_fops);
> +
> +static struct drm_driver pixpaper_drm_driver = {
> + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> + .fops = &pixpaper_fops,
> + .name = "pixpaper",
> + .desc = "DRM driver for PIXPAPER e-ink",
> + .major = 1,
> + .minor = 0,
> + DRM_GEM_SHMEM_DRIVER_OPS,
> + DRM_FBDEV_SHMEM_DRIVER_OPS,
> +};
> +
> +static const struct drm_mode_config_funcs pixpaper_mode_config_funcs = {
> + .fb_create = drm_gem_fb_create_with_dirty,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static int pixpaper_probe(struct spi_device *spi)
> +{
> + struct device *dev = &spi->dev;
> + struct pixpaper_panel *panel;
> + struct drm_device *drm;
> + int ret;
> +
> + panel = devm_drm_dev_alloc(dev, &pixpaper_drm_driver,
> + struct pixpaper_panel, drm);
> + if (IS_ERR(panel))
> + return PTR_ERR(panel);
> +
> + drm = &panel->drm;
> + panel->spi = spi;
> + spi_set_drvdata(spi, panel);
> +
> + spi->mode = SPI_MODE_0;
> + spi->bits_per_word = PIXPAPER_SPI_BITS_PER_WORD;
> +
> + if (!spi->max_speed_hz) {
> + drm_warn(drm,
> + "spi-max-frequency not specified in DT, using default %u Hz\n",
> + PIXPAPER_SPI_SPEED_DEFAULT);
> + spi->max_speed_hz = PIXPAPER_SPI_SPEED_DEFAULT;
> + }
> +
> + ret = spi_setup(spi);
> + if (ret < 0) {
> + drm_err(drm, "SPI setup failed: %d\n", ret);
> + return ret;
> + }
> +
> + if (!dev->dma_mask)
> + dev->dma_mask = &dev->coherent_dma_mask;
> + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (ret) {
> + drm_err(drm, "Failed to set DMA mask: %d\n", ret);
> + return ret;
> + }
> +
> + panel->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(panel->reset))
> + return PTR_ERR(panel->reset);
> +
> + panel->busy = devm_gpiod_get(dev, "busy", GPIOD_IN);
> + if (IS_ERR(panel->busy))
> + return PTR_ERR(panel->busy);
> +
> + panel->dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH);
> + if (IS_ERR(panel->dc))
> + return PTR_ERR(panel->dc);
> +
> + ret = pixpaper_panel_hw_init(panel);
> + if (ret) {
> + drm_err(drm, "Panel hardware initialization failed: %d\n", ret);
> + return ret;
> + }
> +
> + ret = drmm_mode_config_init(drm);
> + if (ret)
> + return ret;
> + drm->mode_config.funcs = &pixpaper_mode_config_funcs;
> + drm->mode_config.min_width = PIXPAPER_WIDTH;
> + drm->mode_config.max_width = PIXPAPER_WIDTH;
> + drm->mode_config.min_height = PIXPAPER_HEIGHT;
> + drm->mode_config.max_height = PIXPAPER_HEIGHT;
> +
> + ret = drm_universal_plane_init(drm, &panel->plane, 1,
> + &pixpaper_plane_funcs,
> + (const uint32_t[]){ DRM_FORMAT_XRGB8888 },
> + 1, NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> + if (ret)
> + return ret;
> + drm_plane_helper_add(&panel->plane, &pixpaper_plane_helper_funcs);
> +
> + ret = drm_crtc_init_with_planes(drm, &panel->crtc, &panel->plane, NULL,
> + &pixpaper_crtc_funcs, NULL);
> + if (ret)
> + return ret;
> + drm_crtc_helper_add(&panel->crtc, &pixpaper_crtc_helper_funcs);
> +
> + ret = drm_encoder_init(drm, &panel->encoder, &pixpaper_encoder_funcs,
> + DRM_MODE_ENCODER_NONE, NULL);
> + if (ret)
> + return ret;
> + panel->encoder.possible_crtcs = drm_crtc_mask(&panel->crtc);
> +
> + ret = drm_connector_init(drm, &panel->connector,
> + &pixpaper_connector_funcs,
> + DRM_MODE_CONNECTOR_SPI);
> + if (ret)
> + return ret;
> +
> + drm_connector_helper_add(&panel->connector,
> + &pixpaper_connector_helper_funcs);
> + drm_connector_attach_encoder(&panel->connector, &panel->encoder);
> +
> + drm_mode_config_reset(drm);
> +
> + ret = drm_dev_register(drm, 0);
> + if (ret)
> + return ret;
> +
> + drm_client_setup(drm, NULL);
> +
> + return 0;
> +}
> +
> +static void pixpaper_remove(struct spi_device *spi)
> +{
> + struct pixpaper_panel *panel = spi_get_drvdata(spi);
> +
> + if (!panel)
> + return;
> +
> + drm_dev_unplug(&panel->drm);
> + drm_atomic_helper_shutdown(&panel->drm);
> +}
> +
> +static const struct spi_device_id pixpaper_ids[] = { { "pixpaper", 0 }, {} };
> +MODULE_DEVICE_TABLE(spi, pixpaper_ids);
> +
> +static const struct of_device_id pixpaper_dt_ids[] = {
> + { .compatible = "mayqueen,pixpaper" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, pixpaper_dt_ids);
> +
> +static struct spi_driver pixpaper_spi_driver = {
> + .driver = {
> + .name = "pixpaper",
> + .of_match_table = pixpaper_dt_ids,
> + },
> + .id_table = pixpaper_ids,
> + .probe = pixpaper_probe,
> + .remove = pixpaper_remove,
> +};
> +
> +module_spi_driver(pixpaper_spi_driver);
> +
> +MODULE_AUTHOR("LiangCheng Wang");
> +MODULE_DESCRIPTION("DRM SPI driver for PIXPAPER e-ink panel");
> +MODULE_LICENSE("GPL");
>
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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