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Message-Id: <20251024-st7571-split-v1-5-d3092b98130f@gmail.com>
Date: Fri, 24 Oct 2025 12:56:56 +0200
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH 5/6] drm/sitronix/st7571: split up the driver into a common
and an i2c part
Split up the driver to make it possible to add support for hw interfaces
other than I2C.
Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
MAINTAINERS | 1 +
drivers/gpu/drm/sitronix/Kconfig | 26 +-
drivers/gpu/drm/sitronix/Makefile | 1 +
drivers/gpu/drm/sitronix/st7571-i2c.c | 924 +---------------------------------
drivers/gpu/drm/sitronix/st7571.c | 918 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/sitronix/st7571.h | 6 +
6 files changed, 959 insertions(+), 917 deletions(-)
diff --git a/MAINTAINERS b/MAINTAINERS
index 2814faae61eceecae1bccaaf92010e22dca81376..66e9ffb757c8bb19dbb894eb51f88f589ee83af6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8083,6 +8083,7 @@ S: Maintained
F: Documentation/devicetree/bindings/display/sitronix,st7567.yaml
F: Documentation/devicetree/bindings/display/sitronix,st7571.yaml
F: drivers/gpu/drm/sitronix/st7571-i2c.c
+F: drivers/gpu/drm/sitronix/st7571.c
F: drivers/gpu/drm/sitronix/st7571.h
DRM DRIVER FOR SITRONIX ST7701 PANELS
diff --git a/drivers/gpu/drm/sitronix/Kconfig b/drivers/gpu/drm/sitronix/Kconfig
index 6de7d92d9b74c72746915b945869dba91f161d2b..0676a86661caa4ab81f226ff2e990a3e2526f74d 100644
--- a/drivers/gpu/drm/sitronix/Kconfig
+++ b/drivers/gpu/drm/sitronix/Kconfig
@@ -1,13 +1,29 @@
-config DRM_ST7571_I2C
- tristate "DRM support for Sitronix ST7571 display panels (I2C)"
- depends on DRM && I2C && MMU
+config DRM_ST7571
+ tristate "DRM support for Sitronix ST7567/ST7571 display panels"
+ depends on DRM && MMU
select DRM_CLIENT_SELECTION
select DRM_GEM_SHMEM_HELPER
select DRM_KMS_HELPER
- select REGMAP_I2C
select VIDEOMODE_HELPERS
help
- DRM driver for Sitronix ST7571 panels controlled over I2C.
+ Sitronix ST7571 is a driver and controller for 4-level gray
+ scale and monochrome dot matrix LCD panels.
+
+ DRM driver for Sitronix ST7567/ST7571 panels.
+ This is only the core driver, a driver for the appropriate bus
+ transport in your chip also must be selected.
+
+ if M is selected the module will be called st7571.
+
+config DRM_ST7571_I2C
+ tristate "DRM support for Sitronix ST7567/ST7571 display panels (I2C)"
+ depends on DRM_ST7571 && I2C
+ select REGMAP_I2C
+ help
+ Sitronix ST7571 is a driver and controller for 4-level gray
+ scale and monochrome dot matrix LCD panels.
+
+ DRM driver for Sitronix ST7565/ST7571 panels connected via I2C bus.
if M is selected the module will be called st7571-i2c.
diff --git a/drivers/gpu/drm/sitronix/Makefile b/drivers/gpu/drm/sitronix/Makefile
index bd139e5a6995fa026cc635b3c29782473d1efad7..8073bb776ff94de750f350b636fd9db3d54fdd46 100644
--- a/drivers/gpu/drm/sitronix/Makefile
+++ b/drivers/gpu/drm/sitronix/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_DRM_ST7571) += st7571.o
obj-$(CONFIG_DRM_ST7571_I2C) += st7571-i2c.o
obj-$(CONFIG_DRM_ST7586) += st7586.o
obj-$(CONFIG_DRM_ST7735R) += st7735r.o
diff --git a/drivers/gpu/drm/sitronix/st7571-i2c.c b/drivers/gpu/drm/sitronix/st7571-i2c.c
index f994ace407390dba30c0968ca99f437382badfab..038a7c2b6f26169f40305a382dace7031d9efc43 100644
--- a/drivers/gpu/drm/sitronix/st7571-i2c.c
+++ b/drivers/gpu/drm/sitronix/st7571-i2c.c
@@ -1,85 +1,16 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * Driver for Sitronix ST7571, a 4 level gray scale dot matrix LCD controller
+ * Driver for Sitronix ST7571 connected via I2C bus.
*
* Copyright (C) 2025 Marcus Folkesson <marcus.folkesson@...il.com>
*/
-#include <linux/bitfield.h>
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
-#include <drm/clients/drm_client_setup.h>
-#include <drm/drm_atomic.h>
-#include <drm/drm_atomic_helper.h>
-#include <drm/drm_connector.h>
-#include <drm/drm_crtc_helper.h>
-#include <drm/drm_damage_helper.h>
-#include <drm/drm_drv.h>
-#include <drm/drm_encoder.h>
-#include <drm/drm_fb_helper.h>
-#include <drm/drm_fbdev_shmem.h>
-#include <drm/drm_fourcc.h>
-#include <drm/drm_framebuffer.h>
-#include <drm/drm_gem_atomic_helper.h>
-#include <drm/drm_gem_framebuffer_helper.h>
-#include <drm/drm_gem_shmem_helper.h>
-#include <drm/drm_modeset_helper_vtables.h>
-#include <drm/drm_module.h>
-#include <drm/drm_plane.h>
-#include <drm/drm_probe_helper.h>
-
-#include <video/display_timing.h>
-#include <video/of_display_timing.h>
-
#include "st7571.h"
-#define ST7571_COMMAND_MODE (0x00)
-#define ST7571_DATA_MODE (0x40)
-
-/* Normal mode command set */
-#define ST7571_DISPLAY_OFF (0xae)
-#define ST7571_DISPLAY_ON (0xaf)
-#define ST7571_OSC_ON (0xab)
-#define ST7571_SET_COLUMN_LSB(c) (0x00 | FIELD_PREP(GENMASK(3, 0), (c)))
-#define ST7571_SET_COLUMN_MSB(c) (0x10 | FIELD_PREP(GENMASK(2, 0), (c) >> 4))
-#define ST7571_SET_COM0_LSB(x) (FIELD_PREP(GENMASK(6, 0), (x)))
-#define ST7571_SET_COM0_MSB (0x44)
-#define ST7571_SET_COM_SCAN_DIR(d) (0xc0 | FIELD_PREP(GENMASK(3, 3), (d)))
-#define ST7571_SET_CONTRAST_LSB(c) (FIELD_PREP(GENMASK(5, 0), (c)))
-#define ST7571_SET_CONTRAST_MSB (0x81)
-#define ST7571_SET_DISPLAY_DUTY_LSB(d) (FIELD_PREP(GENMASK(7, 0), (d)))
-#define ST7571_SET_DISPLAY_DUTY_MSB (0x48)
-#define ST7571_SET_ENTIRE_DISPLAY_ON(p) (0xa4 | FIELD_PREP(GENMASK(0, 0), (p)))
-#define ST7571_SET_LCD_BIAS(b) (0x50 | FIELD_PREP(GENMASK(2, 0), (b)))
-#define ST7571_SET_MODE_LSB(m) (FIELD_PREP(GENMASK(7, 2), (m)))
-#define ST7571_SET_MODE_MSB (0x38)
-#define ST7571_SET_PAGE(p) (0xb0 | FIELD_PREP(GENMASK(3, 0), (p)))
-#define ST7571_SET_POWER(p) (0x28 | FIELD_PREP(GENMASK(2, 0), (p)))
-#define ST7571_SET_REGULATOR_REG(r) (0x20 | FIELD_PREP(GENMASK(2, 0), (r)))
-#define ST7571_SET_REVERSE(r) (0xa6 | FIELD_PREP(GENMASK(0, 0), (r)))
-#define ST7571_SET_SEG_SCAN_DIR(d) (0xa0 | FIELD_PREP(GENMASK(0, 0), (d)))
-#define ST7571_SET_START_LINE_LSB(l) (FIELD_PREP(GENMASK(6, 0), (l)))
-#define ST7571_SET_START_LINE_MSB (0x40)
-
-/* Extension command set 3 */
-#define ST7571_COMMAND_SET_3 (0x7b)
-#define ST7571_SET_COLOR_MODE(c) (0x10 | FIELD_PREP(GENMASK(0, 0), (c)))
-#define ST7571_COMMAND_SET_NORMAL (0x00)
-
-/* ST7567 commands */
-#define ST7567_SET_LCD_BIAS(m) (0xa2 | FIELD_PREP(GENMASK(0, 0), (m)))
-
-#define ST7571_PAGE_HEIGHT 8
-
-#define DRIVER_NAME "st7571"
-#define DRIVER_DESC "ST7571 DRM driver"
-#define DRIVER_MAJOR 1
-#define DRIVER_MINOR 0
-
struct st7571_i2c_transport {
struct i2c_client *client;
@@ -107,12 +38,7 @@ struct st7571_i2c_transport {
bool ignore_nak;
};
-static inline struct st7571_device *drm_to_st7571(struct drm_device *drm)
-{
- return container_of(drm, struct st7571_device, drm);
-}
-
-static int st7571_regmap_write(void *context, const void *data, size_t count)
+static int st7571_i2c_regmap_write(void *context, const void *data, size_t count)
{
struct st7571_i2c_transport *t = context;
int ret;
@@ -139,825 +65,23 @@ static int st7571_regmap_write(void *context, const void *data, size_t count)
}
/* The st7571 driver does not read registers but regmap expects a .read */
-static int st7571_regmap_read(void *context, const void *reg_buf,
- size_t reg_size, void *val_buf, size_t val_size)
+static int st7571_i2c_regmap_read(void *context, const void *reg_buf,
+ size_t reg_size, void *val_buf, size_t val_size)
{
return -EOPNOTSUPP;
}
-static int st7571_send_command_list(struct st7571_device *st7571,
- const u8 *cmd_list, size_t len)
-{
- int ret;
-
- for (int i = 0; i < len; i++) {
- ret = regmap_write(st7571->regmap, ST7571_COMMAND_MODE, cmd_list[i]);
- if (ret < 0)
- return ret;
- }
-
- return ret;
-}
-
-static inline u8 st7571_transform_xy(const char *p, int x, int y, u8 bpp)
-{
- int xrest = x % 8;
- u8 result = 0;
- u8 row_len = 16 * bpp;
-
- /*
- * Transforms an (x, y) pixel coordinate into a vertical 8-bit
- * column from the framebuffer. It calculates the corresponding byte in the
- * framebuffer, extracts the bit at the given x position across 8 consecutive
- * rows, and packs those bits into a single byte.
- *
- * Return an 8-bit value representing a vertical column of pixels.
- */
- x = x / 8;
- y = (y / 8) * 8;
-
- for (int i = 0; i < 8; i++) {
- int row_idx = y + i;
- u8 byte = p[row_idx * row_len + x];
- u8 bit = (byte >> xrest) & 1;
-
- result |= (bit << i);
- }
-
- return result;
-}
-
-static int st7571_set_position(struct st7571_device *st7571, int x, int y)
-{
- u8 cmd_list[] = {
- ST7571_SET_COLUMN_LSB(x),
- ST7571_SET_COLUMN_MSB(x),
- ST7571_SET_PAGE(y / ST7571_PAGE_HEIGHT),
- };
-
- return st7571_send_command_list(st7571, cmd_list, ARRAY_SIZE(cmd_list));
-}
-
-static int st7571_fb_clear_screen(struct st7571_device *st7571)
-{
- u32 npixels = st7571->ncols * round_up(st7571->nlines, ST7571_PAGE_HEIGHT) * st7571->bpp;
- char pixelvalue = 0x00;
-
- st7571_set_position(st7571, 0, 0);
- for (int i = 0; i < npixels; i++)
- regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, &pixelvalue, 1);
-
- return 0;
-}
-
-static void st7571_prepare_buffer_monochrome(struct st7571_device *st7571,
- const struct iosys_map *vmap,
- struct drm_framebuffer *fb,
- struct drm_rect *rect,
- struct drm_format_conv_state *fmtcnv_state)
-{
- unsigned int dst_pitch;
- struct iosys_map dst;
- u32 size;
-
- switch (fb->format->format) {
- case DRM_FORMAT_XRGB8888:
- dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 8);
- iosys_map_set_vaddr(&dst, st7571->hwbuf);
-
- drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
- break;
-
- case DRM_FORMAT_R1:
- size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
- memcpy(st7571->hwbuf, vmap->vaddr, size);
- break;
- }
-}
-
-static void st7571_prepare_buffer_grayscale(struct st7571_device *st7571,
- const struct iosys_map *vmap,
- struct drm_framebuffer *fb,
- struct drm_rect *rect,
- struct drm_format_conv_state *fmtcnv_state)
-{
- u32 size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
- unsigned int dst_pitch;
- struct iosys_map dst;
-
- switch (fb->format->format) {
- case DRM_FORMAT_XRGB8888:
- dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 4);
- iosys_map_set_vaddr(&dst, st7571->hwbuf);
-
- drm_fb_xrgb8888_to_gray2(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
- break;
-
- case DRM_FORMAT_R1:
- size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
- memcpy(st7571->hwbuf, vmap->vaddr, size);
- break;
-
- case DRM_FORMAT_R2:
- size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 4;
- memcpy(st7571->hwbuf, vmap->vaddr, size);
- break;
- }
-}
-
-static int st7571_fb_update_rect_monochrome(struct drm_framebuffer *fb, struct drm_rect *rect)
-{
- struct st7571_device *st7571 = drm_to_st7571(fb->dev);
- char *row = st7571->row;
-
- /* Align y to display page boundaries */
- rect->y1 = round_down(rect->y1, ST7571_PAGE_HEIGHT);
- rect->y2 = min_t(unsigned int, round_up(rect->y2, ST7571_PAGE_HEIGHT), st7571->nlines);
-
- for (int y = rect->y1; y < rect->y2; y += ST7571_PAGE_HEIGHT) {
- for (int x = rect->x1; x < rect->x2; x++)
- row[x] = st7571_transform_xy(st7571->hwbuf, x, y, 1);
-
- st7571_set_position(st7571, rect->x1, y);
-
- /* TODO: Investige why we can't write multiple bytes at once */
- for (int x = rect->x1; x < rect->x2; x++)
- regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
- }
-
- return 0;
-}
-
-static int st7571_fb_update_rect_grayscale(struct drm_framebuffer *fb, struct drm_rect *rect)
-{
- struct st7571_device *st7571 = drm_to_st7571(fb->dev);
- u32 format = fb->format->format;
- char *row = st7571->row;
- int x1;
- int x2;
-
- /* Align y to display page boundaries */
- rect->y1 = round_down(rect->y1, ST7571_PAGE_HEIGHT);
- rect->y2 = min_t(unsigned int, round_up(rect->y2, ST7571_PAGE_HEIGHT), st7571->nlines);
-
- switch (format) {
- case DRM_FORMAT_R1:
- x1 = rect->x1 * 1;
- x2 = rect->x2 * 1;
- break;
- case DRM_FORMAT_R2:
- fallthrough;
- case DRM_FORMAT_XRGB8888:
- x1 = rect->x1 * 2;
- x2 = rect->x2 * 2;
- break;
- }
-
- for (int y = rect->y1; y < rect->y2; y += ST7571_PAGE_HEIGHT) {
- for (int x = x1; x < x2; x++)
- row[x] = st7571_transform_xy(st7571->hwbuf, x, y, 2);
-
- st7571_set_position(st7571, rect->x1, y);
-
- /* TODO: Investige why we can't write multiple bytes at once */
- for (int x = x1; x < x2; x++) {
- regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
-
- /*
- * As the display supports grayscale, all pixels must be written as two bits
- * even if the format is monochrome.
- *
- * The bit values maps to the following grayscale:
- * 0 0 = Black
- * 0 1 = Dark gray
- * 1 0 = Light gray
- * 1 1 = White
- *
- * For monochrome formats, write the same value twice to get
- * either a black or white pixel.
- */
- if (format == DRM_FORMAT_R1)
- regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
- }
- }
-
- return 0;
-}
-
-static int st7571_connector_get_modes(struct drm_connector *conn)
-{
- struct st7571_device *st7571 = drm_to_st7571(conn->dev);
-
- return drm_connector_helper_get_modes_fixed(conn, &st7571->mode);
-}
-
-static const struct drm_connector_helper_funcs st7571_connector_helper_funcs = {
- .get_modes = st7571_connector_get_modes,
-};
-
-static const struct st7571_panel_format st7571_monochrome = {
- .prepare_buffer = st7571_prepare_buffer_monochrome,
- .update_rect = st7571_fb_update_rect_monochrome,
- .mode = ST7571_COLOR_MODE_BLACKWHITE,
- .formats = {
- DRM_FORMAT_XRGB8888,
- DRM_FORMAT_R1,
- },
- .nformats = 2,
-};
-
-static const struct st7571_panel_format st7571_grayscale = {
- .prepare_buffer = st7571_prepare_buffer_grayscale,
- .update_rect = st7571_fb_update_rect_grayscale,
- .mode = ST7571_COLOR_MODE_GRAY,
- .formats = {
- DRM_FORMAT_XRGB8888,
- DRM_FORMAT_R1,
- DRM_FORMAT_R2,
- },
- .nformats = 3,
-};
-
-static const u64 st7571_primary_plane_fmtmods[] = {
- DRM_FORMAT_MOD_LINEAR,
- DRM_FORMAT_MOD_INVALID
-};
-
-static int st7571_primary_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;
-
- if (new_crtc)
- new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
-
- return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
- DRM_PLANE_NO_SCALING,
- DRM_PLANE_NO_SCALING,
- false, false);
-}
-
-static void st7571_primary_plane_helper_atomic_update(struct drm_plane *plane,
- struct drm_atomic_state *state)
-{
- struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
- 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_framebuffer *fb = plane_state->fb;
- struct drm_atomic_helper_damage_iter iter;
- struct drm_device *drm = plane->dev;
- struct drm_rect damage;
- struct st7571_device *st7571 = drm_to_st7571(plane->dev);
- int ret, idx;
-
- if (!fb)
- return; /* no framebuffer; plane is disabled */
-
- ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
- if (ret)
- return;
-
- if (!drm_dev_enter(drm, &idx))
- goto out_drm_gem_fb_end_cpu_access;
-
- drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
- drm_atomic_for_each_plane_damage(&iter, &damage) {
- st7571->pformat->prepare_buffer(st7571,
- &shadow_plane_state->data[0],
- fb, &damage,
- &shadow_plane_state->fmtcnv_state);
-
- st7571->pformat->update_rect(fb, &damage);
- }
-
- drm_dev_exit(idx);
-
-out_drm_gem_fb_end_cpu_access:
- drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
-}
-
-static void st7571_primary_plane_helper_atomic_disable(struct drm_plane *plane,
- struct drm_atomic_state *state)
-{
- struct drm_device *drm = plane->dev;
- struct st7571_device *st7571 = drm_to_st7571(plane->dev);
- int idx;
-
- if (!drm_dev_enter(drm, &idx))
- return;
-
- st7571_fb_clear_screen(st7571);
- drm_dev_exit(idx);
-}
-
-static const struct drm_plane_helper_funcs st7571_primary_plane_helper_funcs = {
- DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
- .atomic_check = st7571_primary_plane_helper_atomic_check,
- .atomic_update = st7571_primary_plane_helper_atomic_update,
- .atomic_disable = st7571_primary_plane_helper_atomic_disable,
-};
-
-static const struct drm_plane_funcs st7571_primary_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,
-};
-
-/*
- * CRTC
- */
-
-static enum drm_mode_status st7571_crtc_mode_valid(struct drm_crtc *crtc,
- const struct drm_display_mode *mode)
-{
- struct st7571_device *st7571 = drm_to_st7571(crtc->dev);
-
- return drm_crtc_helper_mode_valid_fixed(crtc, mode, &st7571->mode);
-}
-
-static const struct drm_crtc_helper_funcs st7571_crtc_helper_funcs = {
- .atomic_check = drm_crtc_helper_atomic_check,
- .mode_valid = st7571_crtc_mode_valid,
-};
-
-static const struct drm_crtc_funcs st7571_crtc_funcs = {
- .reset = drm_atomic_helper_crtc_reset,
- .destroy = drm_crtc_cleanup,
- .set_config = drm_atomic_helper_set_config,
- .page_flip = drm_atomic_helper_page_flip,
- .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
-};
-
-/*
- * Encoder
- */
-
-static void st7571_encoder_atomic_enable(struct drm_encoder *encoder,
- struct drm_atomic_state *state)
-{
- struct drm_device *drm = encoder->dev;
- struct st7571_device *st7571 = drm_to_st7571(drm);
- u8 command = ST7571_DISPLAY_ON;
- int ret;
-
- ret = st7571->pdata->init(st7571);
- if (ret)
- return;
-
- st7571_send_command_list(st7571, &command, 1);
-}
-
-static void st7571_encoder_atomic_disable(struct drm_encoder *encoder,
- struct drm_atomic_state *state)
-{
- struct drm_device *drm = encoder->dev;
- struct st7571_device *st7571 = drm_to_st7571(drm);
- u8 command = ST7571_DISPLAY_OFF;
-
- st7571_send_command_list(st7571, &command, 1);
-}
-
-static const struct drm_encoder_funcs st7571_encoder_funcs = {
- .destroy = drm_encoder_cleanup,
-
-};
-
-static const struct drm_encoder_helper_funcs st7571_encoder_helper_funcs = {
- .atomic_enable = st7571_encoder_atomic_enable,
- .atomic_disable = st7571_encoder_atomic_disable,
-};
-
-/*
- * Connector
- */
-
-static const struct drm_connector_funcs st7571_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_mode_config_funcs st7571_mode_config_funcs = {
- .fb_create = drm_gem_fb_create_with_dirty,
- .atomic_check = drm_atomic_helper_check,
- .atomic_commit = drm_atomic_helper_commit,
+static const struct regmap_bus st7571_i2c_regmap_bus = {
+ .read = st7571_i2c_regmap_read,
+ .write = st7571_i2c_regmap_write,
};
-static struct drm_display_mode st7571_mode(struct st7571_device *st7571)
-{
- struct drm_display_mode mode = {
- DRM_SIMPLE_MODE(st7571->ncols, st7571->nlines,
- st7571->width_mm, st7571->height_mm),
- };
-
- return mode;
-}
-
-static int st7571_mode_config_init(struct st7571_device *st7571)
-{
- struct drm_device *drm = &st7571->drm;
- const struct st7571_panel_constraints *constraints = &st7571->pdata->constraints;
- int ret;
-
- ret = drmm_mode_config_init(drm);
- if (ret)
- return ret;
-
- drm->mode_config.min_width = constraints->min_ncols;
- drm->mode_config.min_height = constraints->min_nlines;
- drm->mode_config.max_width = constraints->max_ncols;
- drm->mode_config.max_height = constraints->max_nlines;
- drm->mode_config.preferred_depth = 24;
- drm->mode_config.funcs = &st7571_mode_config_funcs;
-
- return 0;
-}
-
-static int st7571_plane_init(struct st7571_device *st7571,
- const struct st7571_panel_format *pformat)
-{
- struct drm_plane *primary_plane = &st7571->primary_plane;
- struct drm_device *drm = &st7571->drm;
- int ret;
-
- ret = drm_universal_plane_init(drm, primary_plane, 0,
- &st7571_primary_plane_funcs,
- pformat->formats,
- pformat->nformats,
- st7571_primary_plane_fmtmods,
- DRM_PLANE_TYPE_PRIMARY, NULL);
- if (ret)
- return ret;
-
- drm_plane_helper_add(primary_plane, &st7571_primary_plane_helper_funcs);
- drm_plane_enable_fb_damage_clips(primary_plane);
-
- return 0;
-}
-
-static int st7571_crtc_init(struct st7571_device *st7571)
-{
- struct drm_plane *primary_plane = &st7571->primary_plane;
- struct drm_crtc *crtc = &st7571->crtc;
- struct drm_device *drm = &st7571->drm;
- int ret;
-
- ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
- &st7571_crtc_funcs, NULL);
- if (ret)
- return ret;
-
- drm_crtc_helper_add(crtc, &st7571_crtc_helper_funcs);
-
- return 0;
-}
-
-static int st7571_encoder_init(struct st7571_device *st7571)
-{
- struct drm_encoder *encoder = &st7571->encoder;
- struct drm_crtc *crtc = &st7571->crtc;
- struct drm_device *drm = &st7571->drm;
- int ret;
-
- ret = drm_encoder_init(drm, encoder, &st7571_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
- if (ret)
- return ret;
-
- drm_encoder_helper_add(encoder, &st7571_encoder_helper_funcs);
-
- encoder->possible_crtcs = drm_crtc_mask(crtc);
-
- return 0;
-}
-
-static int st7571_connector_init(struct st7571_device *st7571)
-{
- struct drm_connector *connector = &st7571->connector;
- struct drm_encoder *encoder = &st7571->encoder;
- struct drm_device *drm = &st7571->drm;
- int ret;
-
- ret = drm_connector_init(drm, connector, &st7571_connector_funcs,
- DRM_MODE_CONNECTOR_Unknown);
- if (ret)
- return ret;
-
- drm_connector_helper_add(connector, &st7571_connector_helper_funcs);
-
- return drm_connector_attach_encoder(connector, encoder);
-}
-
-DEFINE_DRM_GEM_FOPS(st7571_fops);
-
-static const struct drm_driver st7571_driver = {
- .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
-
- .name = DRIVER_NAME,
- .desc = DRIVER_DESC,
- .major = DRIVER_MAJOR,
- .minor = DRIVER_MINOR,
-
- .fops = &st7571_fops,
- DRM_GEM_SHMEM_DRIVER_OPS,
- DRM_FBDEV_SHMEM_DRIVER_OPS,
-};
-
-static const struct regmap_bus st7571_regmap_bus = {
- .read = st7571_regmap_read,
- .write = st7571_regmap_write,
-};
-
-static const struct regmap_config st7571_regmap_config = {
+static const struct regmap_config st7571_i2c_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.use_single_write = true,
};
-static int st7571_validate_parameters(struct st7571_device *st7571)
-{
- struct device *dev = st7571->dev;
- const struct st7571_panel_constraints *constraints = &st7571->pdata->constraints;
-
- if (st7571->width_mm == 0) {
- dev_err(dev, "Invalid panel width\n");
- return -EINVAL;
- }
-
- if (st7571->height_mm == 0) {
- dev_err(dev, "Invalid panel height\n");
- return -EINVAL;
- }
-
- if (st7571->nlines < constraints->min_nlines ||
- st7571->nlines > constraints->max_nlines) {
- dev_err(dev, "Invalid timing configuration.\n");
- return -EINVAL;
- }
-
- if (st7571->startline + st7571->nlines > constraints->max_nlines) {
- dev_err(dev, "Invalid timing configuration.\n");
- return -EINVAL;
- }
-
- if (st7571->ncols < constraints->min_ncols ||
- st7571->ncols > constraints->max_ncols) {
- dev_err(dev, "Invalid timing configuration.\n");
- return -EINVAL;
- }
-
- if (st7571->grayscale && !constraints->support_grayscale) {
- dev_err(dev, "Grayscale not supported\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int st7567_parse_dt(struct st7571_device *st7567)
-{
- struct device *dev = st7567->dev;
- struct device_node *np = dev->of_node;
- struct display_timing dt;
- int ret;
-
- ret = of_get_display_timing(np, "panel-timing", &dt);
- if (ret) {
- dev_err(dev, "Failed to get display timing from DT\n");
- return ret;
- }
-
- of_property_read_u32(np, "width-mm", &st7567->width_mm);
- of_property_read_u32(np, "height-mm", &st7567->height_mm);
- st7567->inverted = of_property_read_bool(np, "sitronix,inverted");
-
- st7567->pformat = &st7571_monochrome;
- st7567->bpp = 1;
-
- st7567->startline = dt.vfront_porch.typ;
- st7567->nlines = dt.vactive.typ;
- st7567->ncols = dt.hactive.typ;
-
- return 0;
-}
-
-static int st7571_parse_dt(struct st7571_device *st7571)
-{
- struct device *dev = st7571->dev;
- struct device_node *np = dev->of_node;
- struct display_timing dt;
- int ret;
-
- ret = of_get_display_timing(np, "panel-timing", &dt);
- if (ret) {
- dev_err(dev, "Failed to get display timing from DT\n");
- return ret;
- }
-
- of_property_read_u32(np, "width-mm", &st7571->width_mm);
- of_property_read_u32(np, "height-mm", &st7571->height_mm);
- st7571->grayscale = of_property_read_bool(np, "sitronix,grayscale");
- st7571->inverted = of_property_read_bool(np, "sitronix,inverted");
-
- if (st7571->grayscale) {
- st7571->pformat = &st7571_grayscale;
- st7571->bpp = 2;
- } else {
- st7571->pformat = &st7571_monochrome;
- st7571->bpp = 1;
- }
-
- st7571->startline = dt.vfront_porch.typ;
- st7571->nlines = dt.vactive.typ;
- st7571->ncols = dt.hactive.typ;
-
- st7571->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(st7571->reset))
- return dev_err_probe(dev, PTR_ERR(st7571->reset),
- "Failed to get reset gpio\n");
-
-
- return 0;
-}
-
-static void st7571_reset(struct st7571_device *st7571)
-{
- gpiod_set_value_cansleep(st7571->reset, 1);
- fsleep(20);
- gpiod_set_value_cansleep(st7571->reset, 0);
-}
-
-static int st7567_lcd_init(struct st7571_device *st7567)
-{
- /*
- * Most of the initialization sequence is taken directly from the
- * referential initial code in the ST7567 datasheet.
- */
- u8 commands[] = {
- ST7571_DISPLAY_OFF,
-
- ST7567_SET_LCD_BIAS(1),
-
- ST7571_SET_SEG_SCAN_DIR(0),
- ST7571_SET_COM_SCAN_DIR(1),
-
- ST7571_SET_REGULATOR_REG(4),
- ST7571_SET_CONTRAST_MSB,
- ST7571_SET_CONTRAST_LSB(0x20),
-
- ST7571_SET_START_LINE_MSB,
- ST7571_SET_START_LINE_LSB(st7567->startline),
-
- ST7571_SET_POWER(0x4), /* Power Control, VC: ON, VR: OFF, VF: OFF */
- ST7571_SET_POWER(0x6), /* Power Control, VC: ON, VR: ON, VF: OFF */
- ST7571_SET_POWER(0x7), /* Power Control, VC: ON, VR: ON, VF: ON */
-
- ST7571_SET_REVERSE(st7567->inverted ? 1 : 0),
- ST7571_SET_ENTIRE_DISPLAY_ON(0),
- };
-
- return st7571_send_command_list(st7567, commands, ARRAY_SIZE(commands));
-}
-
-static int st7571_lcd_init(struct st7571_device *st7571)
-{
- /*
- * Most of the initialization sequence is taken directly from the
- * referential initial code in the ST7571 datasheet.
- */
- u8 commands[] = {
- ST7571_DISPLAY_OFF,
-
- ST7571_SET_MODE_MSB,
- ST7571_SET_MODE_LSB(0x2e),
-
- ST7571_SET_SEG_SCAN_DIR(0),
- ST7571_SET_COM_SCAN_DIR(1),
-
- ST7571_SET_COM0_MSB,
- ST7571_SET_COM0_LSB(0x00),
-
- ST7571_SET_START_LINE_MSB,
- ST7571_SET_START_LINE_LSB(st7571->startline),
-
- ST7571_OSC_ON,
- ST7571_SET_REGULATOR_REG(5),
- ST7571_SET_CONTRAST_MSB,
- ST7571_SET_CONTRAST_LSB(0x33),
- ST7571_SET_LCD_BIAS(0x04),
- ST7571_SET_DISPLAY_DUTY_MSB,
- ST7571_SET_DISPLAY_DUTY_LSB(st7571->nlines),
-
- ST7571_SET_POWER(0x4), /* Power Control, VC: ON, VR: OFF, VF: OFF */
- ST7571_SET_POWER(0x6), /* Power Control, VC: ON, VR: ON, VF: OFF */
- ST7571_SET_POWER(0x7), /* Power Control, VC: ON, VR: ON, VF: ON */
-
- ST7571_COMMAND_SET_3,
- ST7571_SET_COLOR_MODE(st7571->pformat->mode),
- ST7571_COMMAND_SET_NORMAL,
-
- ST7571_SET_REVERSE(st7571->inverted ? 1 : 0),
- ST7571_SET_ENTIRE_DISPLAY_ON(0),
- };
-
- /* Perform a reset before initializing the controller */
- st7571_reset(st7571);
-
- return st7571_send_command_list(st7571, commands, ARRAY_SIZE(commands));
-}
-
-static struct st7571_device *st7571_probe(struct device *dev,
- struct regmap *regmap)
-{
- struct st7571_device *st7571;
- struct drm_device *drm;
- int ret;
-
- st7571 = devm_drm_dev_alloc(dev, &st7571_driver,
- struct st7571_device, drm);
- if (IS_ERR(st7571))
- return st7571;
-
- drm = &st7571->drm;
- st7571->dev = dev;
- st7571->pdata = device_get_match_data(st7571->dev);
-
- ret = st7571->pdata->parse_dt(st7571);
- if (ret)
- return ERR_PTR(ret);
-
- ret = st7571_validate_parameters(st7571);
- if (ret)
- return ERR_PTR(ret);
-
- st7571->mode = st7571_mode(st7571);
- st7571->regmap = regmap;
-
-
- st7571->hwbuf = devm_kzalloc(st7571->dev,
- (st7571->nlines * st7571->ncols * st7571->bpp) / 8,
- GFP_KERNEL);
- if (!st7571->hwbuf)
- return ERR_PTR(-ENOMEM);
-
- st7571->row = devm_kzalloc(st7571->dev,
- (st7571->ncols * st7571->bpp),
- GFP_KERNEL);
- if (!st7571->row)
- return ERR_PTR(-ENOMEM);
-
- ret = st7571_mode_config_init(st7571);
- if (ret) {
- dev_err(st7571->dev, "Failed to initialize mode config\n");
- return ERR_PTR(ret);
- }
-
- ret = st7571_plane_init(st7571, st7571->pformat);
- if (ret) {
- dev_err(st7571->dev, "Failed to initialize primary plane\n");
- return ERR_PTR(ret);
- }
-
- ret = st7571_crtc_init(st7571);
- if (ret < 0) {
- dev_err(st7571->dev, "Failed to initialize CRTC\n");
- return ERR_PTR(ret);
- }
-
- ret = st7571_encoder_init(st7571);
- if (ret < 0) {
- dev_err(st7571->dev, "Failed to initialize encoder\n");
- return ERR_PTR(ret);
- }
-
- ret = st7571_connector_init(st7571);
- if (ret < 0) {
- dev_err(st7571->dev, "Failed to initialize connector\n");
- return ERR_PTR(ret);
- }
-
- drm_mode_config_reset(drm);
-
- ret = drm_dev_register(drm, 0);
- if (ret) {
- dev_err(st7571->dev, "Failed to register DRM device\n");
- return ERR_PTR(ret);
- }
-
- drm_client_setup(drm, NULL);
- return st7571;
-}
-
-static void st7571_remove(struct st7571_device *st7571)
-{
- drm_dev_unplug(&st7571->drm);
-}
-
static int st7571_i2c_probe(struct i2c_client *client)
{
struct st7571_device *st7571;
@@ -979,8 +103,8 @@ static int st7571_i2c_probe(struct i2c_client *client)
if (i2c_check_functionality(client->adapter, I2C_FUNC_PROTOCOL_MANGLING))
t->ignore_nak = true;
- regmap = devm_regmap_init(&client->dev, &st7571_regmap_bus,
- t, &st7571_regmap_config);
+ regmap = devm_regmap_init(&client->dev, &st7571_i2c_regmap_bus,
+ t, &st7571_i2c_regmap_config);
if (IS_ERR(regmap)) {
return dev_err_probe(&client->dev, PTR_ERR(regmap),
"Failed to initialize regmap\n");
@@ -1002,30 +126,6 @@ static void st7571_i2c_remove(struct i2c_client *client)
st7571_remove(st7571);
}
-static const struct st7571_panel_data st7567_config = {
- .init = st7567_lcd_init,
- .parse_dt = st7567_parse_dt,
- .constraints = {
- .min_nlines = 1,
- .max_nlines = 64,
- .min_ncols = 128,
- .max_ncols = 128,
- .support_grayscale = false,
- },
-};
-
-static const struct st7571_panel_data st7571_config = {
- .init = st7571_lcd_init,
- .parse_dt = st7571_parse_dt,
- .constraints = {
- .min_nlines = 1,
- .max_nlines = 128,
- .min_ncols = 128,
- .max_ncols = 128,
- .support_grayscale = true,
- },
-};
-
static const struct of_device_id st7571_of_match[] = {
{ .compatible = "sitronix,st7567", .data = &st7567_config },
{ .compatible = "sitronix,st7571", .data = &st7571_config },
@@ -1042,7 +142,7 @@ MODULE_DEVICE_TABLE(i2c, st7571_id);
static struct i2c_driver st7571_i2c_driver = {
.driver = {
- .name = "st7571",
+ .name = "st7571-i2c",
.of_match_table = st7571_of_match,
},
.probe = st7571_i2c_probe,
@@ -1053,5 +153,5 @@ static struct i2c_driver st7571_i2c_driver = {
module_i2c_driver(st7571_i2c_driver);
MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@...il.com>");
-MODULE_DESCRIPTION("DRM Driver for Sitronix ST7571 LCD controller");
+MODULE_DESCRIPTION("DRM Driver for Sitronix ST7571 LCD controller (I2C)");
MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/sitronix/st7571.c b/drivers/gpu/drm/sitronix/st7571.c
new file mode 100644
index 0000000000000000000000000000000000000000..5fd575d972a2e3b6654af7ed0a4ab5c4323e7a33
--- /dev/null
+++ b/drivers/gpu/drm/sitronix/st7571.c
@@ -0,0 +1,918 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Sitronix ST7571, a 4 level gray scale dot matrix LCD controller
+ *
+ * Copyright (C) 2025 Marcus Folkesson <marcus.folkesson@...il.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fbdev_shmem.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_module.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_probe_helper.h>
+
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+
+#include "st7571.h"
+
+#define ST7571_COMMAND_MODE (0x00)
+#define ST7571_DATA_MODE (0x40)
+
+/* Normal mode command set */
+#define ST7571_DISPLAY_OFF (0xae)
+#define ST7571_DISPLAY_ON (0xaf)
+#define ST7571_OSC_ON (0xab)
+#define ST7571_SET_COLUMN_LSB(c) (0x00 | FIELD_PREP(GENMASK(3, 0), (c)))
+#define ST7571_SET_COLUMN_MSB(c) (0x10 | FIELD_PREP(GENMASK(2, 0), (c) >> 4))
+#define ST7571_SET_COM0_LSB(x) (FIELD_PREP(GENMASK(6, 0), (x)))
+#define ST7571_SET_COM0_MSB (0x44)
+#define ST7571_SET_COM_SCAN_DIR(d) (0xc0 | FIELD_PREP(GENMASK(3, 3), (d)))
+#define ST7571_SET_CONTRAST_LSB(c) (FIELD_PREP(GENMASK(5, 0), (c)))
+#define ST7571_SET_CONTRAST_MSB (0x81)
+#define ST7571_SET_DISPLAY_DUTY_LSB(d) (FIELD_PREP(GENMASK(7, 0), (d)))
+#define ST7571_SET_DISPLAY_DUTY_MSB (0x48)
+#define ST7571_SET_ENTIRE_DISPLAY_ON(p) (0xa4 | FIELD_PREP(GENMASK(0, 0), (p)))
+#define ST7571_SET_LCD_BIAS(b) (0x50 | FIELD_PREP(GENMASK(2, 0), (b)))
+#define ST7571_SET_MODE_LSB(m) (FIELD_PREP(GENMASK(7, 2), (m)))
+#define ST7571_SET_MODE_MSB (0x38)
+#define ST7571_SET_PAGE(p) (0xb0 | FIELD_PREP(GENMASK(3, 0), (p)))
+#define ST7571_SET_POWER(p) (0x28 | FIELD_PREP(GENMASK(2, 0), (p)))
+#define ST7571_SET_REGULATOR_REG(r) (0x20 | FIELD_PREP(GENMASK(2, 0), (r)))
+#define ST7571_SET_REVERSE(r) (0xa6 | FIELD_PREP(GENMASK(0, 0), (r)))
+#define ST7571_SET_SEG_SCAN_DIR(d) (0xa0 | FIELD_PREP(GENMASK(0, 0), (d)))
+#define ST7571_SET_START_LINE_LSB(l) (FIELD_PREP(GENMASK(6, 0), (l)))
+#define ST7571_SET_START_LINE_MSB (0x40)
+
+/* Extension command set 3 */
+#define ST7571_COMMAND_SET_3 (0x7b)
+#define ST7571_SET_COLOR_MODE(c) (0x10 | FIELD_PREP(GENMASK(0, 0), (c)))
+#define ST7571_COMMAND_SET_NORMAL (0x00)
+
+/* ST7567 commands */
+#define ST7567_SET_LCD_BIAS(m) (0xa2 | FIELD_PREP(GENMASK(0, 0), (m)))
+
+#define ST7571_PAGE_HEIGHT 8
+
+#define DRIVER_NAME "st7571"
+#define DRIVER_DESC "ST7571 DRM driver"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+static inline struct st7571_device *drm_to_st7571(struct drm_device *drm)
+{
+ return container_of(drm, struct st7571_device, drm);
+}
+
+static int st7571_send_command_list(struct st7571_device *st7571,
+ const u8 *cmd_list, size_t len)
+{
+ int ret;
+
+ for (int i = 0; i < len; i++) {
+ ret = regmap_write(st7571->regmap, ST7571_COMMAND_MODE, cmd_list[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
+static inline u8 st7571_transform_xy(const char *p, int x, int y, u8 bpp)
+{
+ int xrest = x % 8;
+ u8 result = 0;
+ u8 row_len = 16 * bpp;
+
+ /*
+ * Transforms an (x, y) pixel coordinate into a vertical 8-bit
+ * column from the framebuffer. It calculates the corresponding byte in the
+ * framebuffer, extracts the bit at the given x position across 8 consecutive
+ * rows, and packs those bits into a single byte.
+ *
+ * Return an 8-bit value representing a vertical column of pixels.
+ */
+ x = x / 8;
+ y = (y / 8) * 8;
+
+ for (int i = 0; i < 8; i++) {
+ int row_idx = y + i;
+ u8 byte = p[row_idx * row_len + x];
+ u8 bit = (byte >> xrest) & 1;
+
+ result |= (bit << i);
+ }
+
+ return result;
+}
+
+static int st7571_set_position(struct st7571_device *st7571, int x, int y)
+{
+ u8 cmd_list[] = {
+ ST7571_SET_COLUMN_LSB(x),
+ ST7571_SET_COLUMN_MSB(x),
+ ST7571_SET_PAGE(y / ST7571_PAGE_HEIGHT),
+ };
+
+ return st7571_send_command_list(st7571, cmd_list, ARRAY_SIZE(cmd_list));
+}
+
+static int st7571_fb_clear_screen(struct st7571_device *st7571)
+{
+ u32 npixels = st7571->ncols * round_up(st7571->nlines, ST7571_PAGE_HEIGHT) * st7571->bpp;
+ char pixelvalue = 0x00;
+
+ st7571_set_position(st7571, 0, 0);
+ for (int i = 0; i < npixels; i++)
+ regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, &pixelvalue, 1);
+
+ return 0;
+}
+
+static void st7571_prepare_buffer_monochrome(struct st7571_device *st7571,
+ const struct iosys_map *vmap,
+ struct drm_framebuffer *fb,
+ struct drm_rect *rect,
+ struct drm_format_conv_state *fmtcnv_state)
+{
+ unsigned int dst_pitch;
+ struct iosys_map dst;
+ u32 size;
+
+ switch (fb->format->format) {
+ case DRM_FORMAT_XRGB8888:
+ dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 8);
+ iosys_map_set_vaddr(&dst, st7571->hwbuf);
+
+ drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
+ break;
+
+ case DRM_FORMAT_R1:
+ size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
+ memcpy(st7571->hwbuf, vmap->vaddr, size);
+ break;
+ }
+}
+
+static void st7571_prepare_buffer_grayscale(struct st7571_device *st7571,
+ const struct iosys_map *vmap,
+ struct drm_framebuffer *fb,
+ struct drm_rect *rect,
+ struct drm_format_conv_state *fmtcnv_state)
+{
+ u32 size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
+ unsigned int dst_pitch;
+ struct iosys_map dst;
+
+ switch (fb->format->format) {
+ case DRM_FORMAT_XRGB8888:
+ dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 4);
+ iosys_map_set_vaddr(&dst, st7571->hwbuf);
+
+ drm_fb_xrgb8888_to_gray2(&dst, &dst_pitch, vmap, fb, rect, fmtcnv_state);
+ break;
+
+ case DRM_FORMAT_R1:
+ size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 8;
+ memcpy(st7571->hwbuf, vmap->vaddr, size);
+ break;
+
+ case DRM_FORMAT_R2:
+ size = (rect->x2 - rect->x1) * (rect->y2 - rect->y1) / 4;
+ memcpy(st7571->hwbuf, vmap->vaddr, size);
+ break;
+ }
+}
+
+static int st7571_fb_update_rect_monochrome(struct drm_framebuffer *fb, struct drm_rect *rect)
+{
+ struct st7571_device *st7571 = drm_to_st7571(fb->dev);
+ char *row = st7571->row;
+
+ /* Align y to display page boundaries */
+ rect->y1 = round_down(rect->y1, ST7571_PAGE_HEIGHT);
+ rect->y2 = min_t(unsigned int, round_up(rect->y2, ST7571_PAGE_HEIGHT), st7571->nlines);
+
+ for (int y = rect->y1; y < rect->y2; y += ST7571_PAGE_HEIGHT) {
+ for (int x = rect->x1; x < rect->x2; x++)
+ row[x] = st7571_transform_xy(st7571->hwbuf, x, y, 1);
+
+ st7571_set_position(st7571, rect->x1, y);
+
+ /* TODO: Investige why we can't write multiple bytes at once */
+ for (int x = rect->x1; x < rect->x2; x++)
+ regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
+ }
+
+ return 0;
+}
+
+static int st7571_fb_update_rect_grayscale(struct drm_framebuffer *fb, struct drm_rect *rect)
+{
+ struct st7571_device *st7571 = drm_to_st7571(fb->dev);
+ u32 format = fb->format->format;
+ char *row = st7571->row;
+ int x1;
+ int x2;
+
+ /* Align y to display page boundaries */
+ rect->y1 = round_down(rect->y1, ST7571_PAGE_HEIGHT);
+ rect->y2 = min_t(unsigned int, round_up(rect->y2, ST7571_PAGE_HEIGHT), st7571->nlines);
+
+ switch (format) {
+ case DRM_FORMAT_R1:
+ x1 = rect->x1 * 1;
+ x2 = rect->x2 * 1;
+ break;
+ case DRM_FORMAT_R2:
+ fallthrough;
+ case DRM_FORMAT_XRGB8888:
+ x1 = rect->x1 * 2;
+ x2 = rect->x2 * 2;
+ break;
+ }
+
+ for (int y = rect->y1; y < rect->y2; y += ST7571_PAGE_HEIGHT) {
+ for (int x = x1; x < x2; x++)
+ row[x] = st7571_transform_xy(st7571->hwbuf, x, y, 2);
+
+ st7571_set_position(st7571, rect->x1, y);
+
+ /* TODO: Investige why we can't write multiple bytes at once */
+ for (int x = x1; x < x2; x++) {
+ regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
+
+ /*
+ * As the display supports grayscale, all pixels must be written as two bits
+ * even if the format is monochrome.
+ *
+ * The bit values maps to the following grayscale:
+ * 0 0 = Black
+ * 0 1 = Dark gray
+ * 1 0 = Light gray
+ * 1 1 = White
+ *
+ * For monochrome formats, write the same value twice to get
+ * either a black or white pixel.
+ */
+ if (format == DRM_FORMAT_R1)
+ regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, row + x, 1);
+ }
+ }
+
+ return 0;
+}
+
+static int st7571_connector_get_modes(struct drm_connector *conn)
+{
+ struct st7571_device *st7571 = drm_to_st7571(conn->dev);
+
+ return drm_connector_helper_get_modes_fixed(conn, &st7571->mode);
+}
+
+static const struct drm_connector_helper_funcs st7571_connector_helper_funcs = {
+ .get_modes = st7571_connector_get_modes,
+};
+
+static const struct st7571_panel_format st7571_monochrome = {
+ .prepare_buffer = st7571_prepare_buffer_monochrome,
+ .update_rect = st7571_fb_update_rect_monochrome,
+ .mode = ST7571_COLOR_MODE_BLACKWHITE,
+ .formats = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_R1,
+ },
+ .nformats = 2,
+};
+
+static const struct st7571_panel_format st7571_grayscale = {
+ .prepare_buffer = st7571_prepare_buffer_grayscale,
+ .update_rect = st7571_fb_update_rect_grayscale,
+ .mode = ST7571_COLOR_MODE_GRAY,
+ .formats = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_R1,
+ DRM_FORMAT_R2,
+ },
+ .nformats = 3,
+};
+
+static const u64 st7571_primary_plane_fmtmods[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID
+};
+
+static int st7571_primary_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;
+
+ if (new_crtc)
+ new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+ return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+ DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING,
+ false, false);
+}
+
+static void st7571_primary_plane_helper_atomic_update(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+ 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_framebuffer *fb = plane_state->fb;
+ struct drm_atomic_helper_damage_iter iter;
+ struct drm_device *drm = plane->dev;
+ struct drm_rect damage;
+ struct st7571_device *st7571 = drm_to_st7571(plane->dev);
+ int ret, idx;
+
+ if (!fb)
+ return; /* no framebuffer; plane is disabled */
+
+ ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+ if (ret)
+ return;
+
+ if (!drm_dev_enter(drm, &idx))
+ goto out_drm_gem_fb_end_cpu_access;
+
+ drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+ drm_atomic_for_each_plane_damage(&iter, &damage) {
+ st7571->pformat->prepare_buffer(st7571,
+ &shadow_plane_state->data[0],
+ fb, &damage,
+ &shadow_plane_state->fmtcnv_state);
+
+ st7571->pformat->update_rect(fb, &damage);
+ }
+
+ drm_dev_exit(idx);
+
+out_drm_gem_fb_end_cpu_access:
+ drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+}
+
+static void st7571_primary_plane_helper_atomic_disable(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *drm = plane->dev;
+ struct st7571_device *st7571 = drm_to_st7571(plane->dev);
+ int idx;
+
+ if (!drm_dev_enter(drm, &idx))
+ return;
+
+ st7571_fb_clear_screen(st7571);
+ drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs st7571_primary_plane_helper_funcs = {
+ DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+ .atomic_check = st7571_primary_plane_helper_atomic_check,
+ .atomic_update = st7571_primary_plane_helper_atomic_update,
+ .atomic_disable = st7571_primary_plane_helper_atomic_disable,
+};
+
+static const struct drm_plane_funcs st7571_primary_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,
+};
+
+/*
+ * CRTC
+ */
+
+static enum drm_mode_status st7571_crtc_mode_valid(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode)
+{
+ struct st7571_device *st7571 = drm_to_st7571(crtc->dev);
+
+ return drm_crtc_helper_mode_valid_fixed(crtc, mode, &st7571->mode);
+}
+
+static const struct drm_crtc_helper_funcs st7571_crtc_helper_funcs = {
+ .atomic_check = drm_crtc_helper_atomic_check,
+ .mode_valid = st7571_crtc_mode_valid,
+};
+
+static const struct drm_crtc_funcs st7571_crtc_funcs = {
+ .reset = drm_atomic_helper_crtc_reset,
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+/*
+ * Encoder
+ */
+
+static void st7571_encoder_atomic_enable(struct drm_encoder *encoder,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *drm = encoder->dev;
+ struct st7571_device *st7571 = drm_to_st7571(drm);
+ u8 command = ST7571_DISPLAY_ON;
+ int ret;
+
+ ret = st7571->pdata->init(st7571);
+ if (ret)
+ return;
+
+ st7571_send_command_list(st7571, &command, 1);
+}
+
+static void st7571_encoder_atomic_disable(struct drm_encoder *encoder,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *drm = encoder->dev;
+ struct st7571_device *st7571 = drm_to_st7571(drm);
+ u8 command = ST7571_DISPLAY_OFF;
+
+ st7571_send_command_list(st7571, &command, 1);
+}
+
+static const struct drm_encoder_funcs st7571_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+
+};
+
+static const struct drm_encoder_helper_funcs st7571_encoder_helper_funcs = {
+ .atomic_enable = st7571_encoder_atomic_enable,
+ .atomic_disable = st7571_encoder_atomic_disable,
+};
+
+/*
+ * Connector
+ */
+
+static const struct drm_connector_funcs st7571_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_mode_config_funcs st7571_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static struct drm_display_mode st7571_mode(struct st7571_device *st7571)
+{
+ struct drm_display_mode mode = {
+ DRM_SIMPLE_MODE(st7571->ncols, st7571->nlines,
+ st7571->width_mm, st7571->height_mm),
+ };
+
+ return mode;
+}
+
+static int st7571_mode_config_init(struct st7571_device *st7571)
+{
+ struct drm_device *drm = &st7571->drm;
+ const struct st7571_panel_constraints *constraints = &st7571->pdata->constraints;
+ int ret;
+
+ ret = drmm_mode_config_init(drm);
+ if (ret)
+ return ret;
+
+ drm->mode_config.min_width = constraints->min_ncols;
+ drm->mode_config.min_height = constraints->min_nlines;
+ drm->mode_config.max_width = constraints->max_ncols;
+ drm->mode_config.max_height = constraints->max_nlines;
+ drm->mode_config.preferred_depth = 24;
+ drm->mode_config.funcs = &st7571_mode_config_funcs;
+
+ return 0;
+}
+
+static int st7571_plane_init(struct st7571_device *st7571,
+ const struct st7571_panel_format *pformat)
+{
+ struct drm_plane *primary_plane = &st7571->primary_plane;
+ struct drm_device *drm = &st7571->drm;
+ int ret;
+
+ ret = drm_universal_plane_init(drm, primary_plane, 0,
+ &st7571_primary_plane_funcs,
+ pformat->formats,
+ pformat->nformats,
+ st7571_primary_plane_fmtmods,
+ DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (ret)
+ return ret;
+
+ drm_plane_helper_add(primary_plane, &st7571_primary_plane_helper_funcs);
+ drm_plane_enable_fb_damage_clips(primary_plane);
+
+ return 0;
+}
+
+static int st7571_crtc_init(struct st7571_device *st7571)
+{
+ struct drm_plane *primary_plane = &st7571->primary_plane;
+ struct drm_crtc *crtc = &st7571->crtc;
+ struct drm_device *drm = &st7571->drm;
+ int ret;
+
+ ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
+ &st7571_crtc_funcs, NULL);
+ if (ret)
+ return ret;
+
+ drm_crtc_helper_add(crtc, &st7571_crtc_helper_funcs);
+
+ return 0;
+}
+
+static int st7571_encoder_init(struct st7571_device *st7571)
+{
+ struct drm_encoder *encoder = &st7571->encoder;
+ struct drm_crtc *crtc = &st7571->crtc;
+ struct drm_device *drm = &st7571->drm;
+ int ret;
+
+ ret = drm_encoder_init(drm, encoder, &st7571_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL);
+ if (ret)
+ return ret;
+
+ drm_encoder_helper_add(encoder, &st7571_encoder_helper_funcs);
+
+ encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+ return 0;
+}
+
+static int st7571_connector_init(struct st7571_device *st7571)
+{
+ struct drm_connector *connector = &st7571->connector;
+ struct drm_encoder *encoder = &st7571->encoder;
+ struct drm_device *drm = &st7571->drm;
+ int ret;
+
+ ret = drm_connector_init(drm, connector, &st7571_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ret;
+
+ drm_connector_helper_add(connector, &st7571_connector_helper_funcs);
+
+ return drm_connector_attach_encoder(connector, encoder);
+}
+
+DEFINE_DRM_GEM_FOPS(st7571_fops);
+
+static const struct drm_driver st7571_driver = {
+ .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+
+ .fops = &st7571_fops,
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ DRM_FBDEV_SHMEM_DRIVER_OPS,
+};
+
+static int st7571_validate_parameters(struct st7571_device *st7571)
+{
+ struct device *dev = st7571->dev;
+ const struct st7571_panel_constraints *constraints = &st7571->pdata->constraints;
+
+ if (st7571->width_mm == 0) {
+ dev_err(dev, "Invalid panel width\n");
+ return -EINVAL;
+ }
+
+ if (st7571->height_mm == 0) {
+ dev_err(dev, "Invalid panel height\n");
+ return -EINVAL;
+ }
+
+ if (st7571->nlines < constraints->min_nlines ||
+ st7571->nlines > constraints->max_nlines) {
+ dev_err(dev, "Invalid timing configuration.\n");
+ return -EINVAL;
+ }
+
+ if (st7571->startline + st7571->nlines > constraints->max_nlines) {
+ dev_err(dev, "Invalid timing configuration.\n");
+ return -EINVAL;
+ }
+
+ if (st7571->ncols < constraints->min_ncols ||
+ st7571->ncols > constraints->max_ncols) {
+ dev_err(dev, "Invalid timing configuration.\n");
+ return -EINVAL;
+ }
+
+ if (st7571->grayscale && !constraints->support_grayscale) {
+ dev_err(dev, "Grayscale not supported\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int st7567_parse_dt(struct st7571_device *st7567)
+{
+ struct device *dev = st7567->dev;
+ struct device_node *np = dev->of_node;
+ struct display_timing dt;
+ int ret;
+
+ ret = of_get_display_timing(np, "panel-timing", &dt);
+ if (ret) {
+ dev_err(dev, "Failed to get display timing from DT\n");
+ return ret;
+ }
+
+ of_property_read_u32(np, "width-mm", &st7567->width_mm);
+ of_property_read_u32(np, "height-mm", &st7567->height_mm);
+ st7567->inverted = of_property_read_bool(np, "sitronix,inverted");
+
+ st7567->pformat = &st7571_monochrome;
+ st7567->bpp = 1;
+
+ st7567->startline = dt.vfront_porch.typ;
+ st7567->nlines = dt.vactive.typ;
+ st7567->ncols = dt.hactive.typ;
+
+ return 0;
+}
+
+static int st7571_parse_dt(struct st7571_device *st7571)
+{
+ struct device *dev = st7571->dev;
+ struct device_node *np = dev->of_node;
+ struct display_timing dt;
+ int ret;
+
+ ret = of_get_display_timing(np, "panel-timing", &dt);
+ if (ret) {
+ dev_err(dev, "Failed to get display timing from DT\n");
+ return ret;
+ }
+
+ of_property_read_u32(np, "width-mm", &st7571->width_mm);
+ of_property_read_u32(np, "height-mm", &st7571->height_mm);
+ st7571->grayscale = of_property_read_bool(np, "sitronix,grayscale");
+ st7571->inverted = of_property_read_bool(np, "sitronix,inverted");
+
+ if (st7571->grayscale) {
+ st7571->pformat = &st7571_grayscale;
+ st7571->bpp = 2;
+ } else {
+ st7571->pformat = &st7571_monochrome;
+ st7571->bpp = 1;
+ }
+
+ st7571->startline = dt.vfront_porch.typ;
+ st7571->nlines = dt.vactive.typ;
+ st7571->ncols = dt.hactive.typ;
+
+ st7571->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(st7571->reset))
+ return dev_err_probe(dev, PTR_ERR(st7571->reset),
+ "Failed to get reset gpio\n");
+
+ return 0;
+}
+
+static void st7571_reset(struct st7571_device *st7571)
+{
+ gpiod_set_value_cansleep(st7571->reset, 1);
+ fsleep(20);
+ gpiod_set_value_cansleep(st7571->reset, 0);
+}
+
+static int st7567_lcd_init(struct st7571_device *st7567)
+{
+ /*
+ * Most of the initialization sequence is taken directly from the
+ * referential initial code in the ST7567 datasheet.
+ */
+ u8 commands[] = {
+ ST7571_DISPLAY_OFF,
+
+ ST7567_SET_LCD_BIAS(1),
+
+ ST7571_SET_SEG_SCAN_DIR(0),
+ ST7571_SET_COM_SCAN_DIR(1),
+
+ ST7571_SET_REGULATOR_REG(4),
+ ST7571_SET_CONTRAST_MSB,
+ ST7571_SET_CONTRAST_LSB(0x20),
+
+ ST7571_SET_START_LINE_MSB,
+ ST7571_SET_START_LINE_LSB(st7567->startline),
+
+ ST7571_SET_POWER(0x4), /* Power Control, VC: ON, VR: OFF, VF: OFF */
+ ST7571_SET_POWER(0x6), /* Power Control, VC: ON, VR: ON, VF: OFF */
+ ST7571_SET_POWER(0x7), /* Power Control, VC: ON, VR: ON, VF: ON */
+
+ ST7571_SET_REVERSE(st7567->inverted ? 1 : 0),
+ ST7571_SET_ENTIRE_DISPLAY_ON(0),
+ };
+
+ return st7571_send_command_list(st7567, commands, ARRAY_SIZE(commands));
+}
+
+static int st7571_lcd_init(struct st7571_device *st7571)
+{
+ /*
+ * Most of the initialization sequence is taken directly from the
+ * referential initial code in the ST7571 datasheet.
+ */
+ u8 commands[] = {
+ ST7571_DISPLAY_OFF,
+
+ ST7571_SET_MODE_MSB,
+ ST7571_SET_MODE_LSB(0x2e),
+
+ ST7571_SET_SEG_SCAN_DIR(0),
+ ST7571_SET_COM_SCAN_DIR(1),
+
+ ST7571_SET_COM0_MSB,
+ ST7571_SET_COM0_LSB(0x00),
+
+ ST7571_SET_START_LINE_MSB,
+ ST7571_SET_START_LINE_LSB(st7571->startline),
+
+ ST7571_OSC_ON,
+ ST7571_SET_REGULATOR_REG(5),
+ ST7571_SET_CONTRAST_MSB,
+ ST7571_SET_CONTRAST_LSB(0x33),
+ ST7571_SET_LCD_BIAS(0x04),
+ ST7571_SET_DISPLAY_DUTY_MSB,
+ ST7571_SET_DISPLAY_DUTY_LSB(st7571->nlines),
+
+ ST7571_SET_POWER(0x4), /* Power Control, VC: ON, VR: OFF, VF: OFF */
+ ST7571_SET_POWER(0x6), /* Power Control, VC: ON, VR: ON, VF: OFF */
+ ST7571_SET_POWER(0x7), /* Power Control, VC: ON, VR: ON, VF: ON */
+
+ ST7571_COMMAND_SET_3,
+ ST7571_SET_COLOR_MODE(st7571->pformat->mode),
+ ST7571_COMMAND_SET_NORMAL,
+
+ ST7571_SET_REVERSE(st7571->inverted ? 1 : 0),
+ ST7571_SET_ENTIRE_DISPLAY_ON(0),
+ };
+
+ /* Perform a reset before initializing the controller */
+ st7571_reset(st7571);
+
+ return st7571_send_command_list(st7571, commands, ARRAY_SIZE(commands));
+}
+
+struct st7571_device *st7571_probe(struct device *dev,
+ struct regmap *regmap)
+{
+ struct st7571_device *st7571;
+ struct drm_device *drm;
+ int ret;
+
+ st7571 = devm_drm_dev_alloc(dev, &st7571_driver,
+ struct st7571_device, drm);
+ if (IS_ERR(st7571))
+ return st7571;
+
+ drm = &st7571->drm;
+ st7571->dev = dev;
+ st7571->pdata = device_get_match_data(st7571->dev);
+
+ ret = st7571->pdata->parse_dt(st7571);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = st7571_validate_parameters(st7571);
+ if (ret)
+ return ERR_PTR(ret);
+
+ st7571->mode = st7571_mode(st7571);
+ st7571->regmap = regmap;
+
+ st7571->hwbuf = devm_kzalloc(st7571->dev,
+ (st7571->nlines * st7571->ncols * st7571->bpp) / 8,
+ GFP_KERNEL);
+ if (!st7571->hwbuf)
+ return ERR_PTR(-ENOMEM);
+
+ st7571->row = devm_kzalloc(st7571->dev,
+ (st7571->ncols * st7571->bpp),
+ GFP_KERNEL);
+ if (!st7571->row)
+ return ERR_PTR(-ENOMEM);
+
+ ret = st7571_mode_config_init(st7571);
+ if (ret) {
+ dev_err(st7571->dev, "Failed to initialize mode config\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = st7571_plane_init(st7571, st7571->pformat);
+ if (ret) {
+ dev_err(st7571->dev, "Failed to initialize primary plane\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = st7571_crtc_init(st7571);
+ if (ret < 0) {
+ dev_err(st7571->dev, "Failed to initialize CRTC\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = st7571_encoder_init(st7571);
+ if (ret < 0) {
+ dev_err(st7571->dev, "Failed to initialize encoder\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = st7571_connector_init(st7571);
+ if (ret < 0) {
+ dev_err(st7571->dev, "Failed to initialize connector\n");
+ return ERR_PTR(ret);
+ }
+
+ drm_mode_config_reset(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret) {
+ dev_err(st7571->dev, "Failed to register DRM device\n");
+ return ERR_PTR(ret);
+ }
+
+ drm_client_setup(drm, NULL);
+ return st7571;
+}
+EXPORT_SYMBOL_GPL(st7571_probe);
+
+void st7571_remove(struct st7571_device *st7571)
+{
+ drm_dev_unplug(&st7571->drm);
+}
+EXPORT_SYMBOL_GPL(st7571_remove);
+
+const struct st7571_panel_data st7567_config = {
+ .init = st7567_lcd_init,
+ .parse_dt = st7567_parse_dt,
+ .constraints = {
+ .min_nlines = 1,
+ .max_nlines = 64,
+ .min_ncols = 128,
+ .max_ncols = 128,
+ .support_grayscale = false,
+ },
+};
+EXPORT_SYMBOL_NS_GPL(st7567_config, "DRM_ST7571");
+
+const struct st7571_panel_data st7571_config = {
+ .init = st7571_lcd_init,
+ .parse_dt = st7571_parse_dt,
+ .constraints = {
+ .min_nlines = 1,
+ .max_nlines = 128,
+ .min_ncols = 128,
+ .max_ncols = 128,
+ .support_grayscale = true,
+ },
+};
+EXPORT_SYMBOL_NS_GPL(st7571_config, "DRM_ST7571");
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@...il.com>");
+MODULE_DESCRIPTION("DRM Driver for Sitronix ST7571 LCD controller");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/sitronix/st7571.h b/drivers/gpu/drm/sitronix/st7571.h
index f62c57ddb99ebe82f63048cc2ccf75a81518d717..af264f2e2ea47e7813067733e7051db9529ca1f1 100644
--- a/drivers/gpu/drm/sitronix/st7571.h
+++ b/drivers/gpu/drm/sitronix/st7571.h
@@ -82,4 +82,10 @@ struct st7571_device {
u8 *row;
};
+extern const struct st7571_panel_data st7567_config;
+extern const struct st7571_panel_data st7571_config;
+
+struct st7571_device *st7571_probe(struct device *dev, struct regmap *regmap);
+void st7571_remove(struct st7571_device *st7571);
+
#endif /* __ST7571_H__ */
--
2.50.1
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