Resguardo inicial

linux-7.2.3/drivers/gpu/drm/solomon/Kconfig

@@ -0,0 +1,32 @@
+config DRM_SSD130X
+	tristate "DRM support for Solomon SSD13xx OLED displays"
+	depends on DRM && MMU
+	select BACKLIGHT_CLASS_DEVICE
+	select DRM_CLIENT_SELECTION
+	select DRM_GEM_SHMEM_HELPER
+	select DRM_KMS_HELPER
+	help
+	  DRM driver for the SSD13xx Solomon and SINO WEALTH SH110x OLED
+	  controllers. This is only for 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 ssd130x.
+
+config DRM_SSD130X_I2C
+	tristate "DRM support for Solomon SSD13xx OLED displays (I2C bus)"
+	depends on DRM_SSD130X && I2C
+	select REGMAP_I2C
+	help
+	  Say Y here if the SSD13xx or SH110x OLED display is connected via
+	  I2C bus.
+
+	  If M is selected the module will be called ssd130x-i2c.
+
+config DRM_SSD130X_SPI
+	tristate "DRM support for Solomon SSD13xx OLED displays (SPI bus)"
+	depends on DRM_SSD130X && SPI
+	select REGMAP
+	help
+	  Say Y here if the SSD13xx OLED display is connected via SPI bus.
+
+	  If M is selected the module will be called ssd130x-spi.

linux-7.2.3/drivers/gpu/drm/solomon/Makefile

@@ -0,0 +1,3 @@
+obj-$(CONFIG_DRM_SSD130X)	+= ssd130x.o
+obj-$(CONFIG_DRM_SSD130X_I2C)	+= ssd130x-i2c.o
+obj-$(CONFIG_DRM_SSD130X_SPI)	+= ssd130x-spi.o

linux-7.2.3/drivers/gpu/drm/solomon/ssd130x-i2c.c

@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DRM driver for Solomon SSD13xx OLED displays (I2C bus)
+ *
+ * Copyright 2022 Red Hat Inc.
+ * Author: Javier Martinez Canillas <javierm@redhat.com>
+ *
+ * Based on drivers/video/fbdev/ssd1307fb.c
+ * Copyright 2012 Free Electrons
+ */
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include "ssd130x.h"
+
+#define DRIVER_NAME	"ssd130x-i2c"
+#define DRIVER_DESC	"DRM driver for Solomon SSD13xx OLED displays (I2C)"
+
+static const struct regmap_config ssd130x_i2c_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int ssd130x_i2c_probe(struct i2c_client *client)
+{
+	struct ssd130x_device *ssd130x;
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &ssd130x_i2c_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ssd130x = ssd130x_probe(&client->dev, regmap);
+	if (IS_ERR(ssd130x))
+		return PTR_ERR(ssd130x);
+
+	i2c_set_clientdata(client, ssd130x);
+
+	return 0;
+}
+
+static void ssd130x_i2c_remove(struct i2c_client *client)
+{
+	struct ssd130x_device *ssd130x = i2c_get_clientdata(client);
+
+	ssd130x_remove(ssd130x);
+}
+
+static void ssd130x_i2c_shutdown(struct i2c_client *client)
+{
+	struct ssd130x_device *ssd130x = i2c_get_clientdata(client);
+
+	ssd130x_shutdown(ssd130x);
+}
+
+static const struct of_device_id ssd130x_of_match[] = {
+	/* ssd130x family */
+	{
+		.compatible = "sinowealth,sh1106",
+		.data = &ssd130x_variants[SH1106_ID],
+	},
+	{
+		.compatible = "solomon,ssd1305",
+		.data = &ssd130x_variants[SSD1305_ID],
+	},
+	{
+		.compatible = "solomon,ssd1306",
+		.data = &ssd130x_variants[SSD1306_ID],
+	},
+	{
+		.compatible = "solomon,ssd1307",
+		.data = &ssd130x_variants[SSD1307_ID],
+	},
+	{
+		.compatible = "solomon,ssd1309",
+		.data = &ssd130x_variants[SSD1309_ID],
+	},
+	/* Deprecated but kept for backward compatibility */
+	{
+		.compatible = "solomon,ssd1305fb-i2c",
+		.data = &ssd130x_variants[SSD1305_ID],
+	},
+	{
+		.compatible = "solomon,ssd1306fb-i2c",
+		.data = &ssd130x_variants[SSD1306_ID],
+	},
+	{
+		.compatible = "solomon,ssd1307fb-i2c",
+		.data = &ssd130x_variants[SSD1307_ID],
+	},
+	{
+		.compatible = "solomon,ssd1309fb-i2c",
+		.data = &ssd130x_variants[SSD1309_ID],
+	},
+	/* ssd132x family */
+	{
+		.compatible = "solomon,ssd1322",
+		.data = &ssd130x_variants[SSD1322_ID],
+	},
+	{
+		.compatible = "solomon,ssd1325",
+		.data = &ssd130x_variants[SSD1325_ID],
+	},
+	{
+		.compatible = "solomon,ssd1327",
+		.data = &ssd130x_variants[SSD1327_ID],
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ssd130x_of_match);
+
+static struct i2c_driver ssd130x_i2c_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = ssd130x_of_match,
+	},
+	.probe = ssd130x_i2c_probe,
+	.remove = ssd130x_i2c_remove,
+	.shutdown = ssd130x_i2c_shutdown,
+};
+module_i2c_driver(ssd130x_i2c_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Javier Martinez Canillas <javierm@redhat.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("DRM_SSD130X");

linux-7.2.3/drivers/gpu/drm/solomon/ssd130x-spi.c

@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DRM driver for Solomon SSD13xx OLED displays (SPI bus)
+ *
+ * Copyright 2022 Red Hat Inc.
+ * Authors: Javier Martinez Canillas <javierm@redhat.com>
+ */
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+
+#include "ssd130x.h"
+
+#define DRIVER_NAME	"ssd130x-spi"
+#define DRIVER_DESC	"DRM driver for Solomon SSD13xx OLED displays (SPI)"
+
+struct ssd130x_spi_transport {
+	struct spi_device *spi;
+	struct gpio_desc *dc;
+};
+
+/*
+ * The regmap bus .write handler, it is just a wrapper around spi_write()
+ * but toggling the Data/Command control pin (D/C#). Since for 4-wire SPI
+ * a D/C# pin is used, in contrast with I2C where a control byte is sent,
+ * prior to every data byte, that contains a bit with the D/C# value.
+ *
+ * These control bytes are considered registers by the ssd130x core driver
+ * and can be used by the ssd130x SPI driver to determine if the data sent
+ * is for a command register or for the Graphic Display Data RAM (GDDRAM).
+ */
+static int ssd130x_spi_write(void *context, const void *data, size_t count)
+{
+	struct ssd130x_spi_transport *t = context;
+	struct spi_device *spi = t->spi;
+	const u8 *reg = data;
+
+	if (*reg == SSD13XX_COMMAND)
+		gpiod_set_value_cansleep(t->dc, 0);
+
+	if (*reg == SSD13XX_DATA)
+		gpiod_set_value_cansleep(t->dc, 1);
+
+	/* Remove control byte since is not used in a 4-wire SPI interface */
+	return spi_write(spi, reg + 1, count - 1);
+}
+
+/* The ssd130x driver does not read registers but regmap expects a .read */
+static int ssd130x_spi_read(void *context, const void *reg, size_t reg_size,
+			    void *val, size_t val_size)
+{
+	return -EOPNOTSUPP;
+}
+
+static const struct regmap_config ssd130x_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.write = ssd130x_spi_write,
+	.read = ssd130x_spi_read,
+	.can_multi_write = true,
+};
+
+static int ssd130x_spi_probe(struct spi_device *spi)
+{
+	struct ssd130x_spi_transport *t;
+	struct ssd130x_device *ssd130x;
+	struct regmap *regmap;
+	struct gpio_desc *dc;
+	struct device *dev = &spi->dev;
+
+	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		return dev_err_probe(dev, PTR_ERR(dc),
+				     "Failed to get dc gpio\n");
+
+	t = devm_kzalloc(dev, sizeof(*t), GFP_KERNEL);
+	if (!t)
+		return -ENOMEM;
+
+	t->spi = spi;
+	t->dc = dc;
+
+	regmap = devm_regmap_init(dev, NULL, t, &ssd130x_spi_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ssd130x = ssd130x_probe(dev, regmap);
+	if (IS_ERR(ssd130x))
+		return PTR_ERR(ssd130x);
+
+	spi_set_drvdata(spi, ssd130x);
+
+	return 0;
+}
+
+static void ssd130x_spi_remove(struct spi_device *spi)
+{
+	struct ssd130x_device *ssd130x = spi_get_drvdata(spi);
+
+	ssd130x_remove(ssd130x);
+}
+
+static void ssd130x_spi_shutdown(struct spi_device *spi)
+{
+	struct ssd130x_device *ssd130x = spi_get_drvdata(spi);
+
+	ssd130x_shutdown(ssd130x);
+}
+
+static const struct of_device_id ssd130x_of_match[] = {
+	/* ssd130x family */
+	{
+		.compatible = "sinowealth,sh1106",
+		.data = &ssd130x_variants[SH1106_ID],
+	},
+	{
+		.compatible = "solomon,ssd1305",
+		.data = &ssd130x_variants[SSD1305_ID],
+	},
+	{
+		.compatible = "solomon,ssd1306",
+		.data = &ssd130x_variants[SSD1306_ID],
+	},
+	{
+		.compatible = "solomon,ssd1307",
+		.data = &ssd130x_variants[SSD1307_ID],
+	},
+	{
+		.compatible = "solomon,ssd1309",
+		.data = &ssd130x_variants[SSD1309_ID],
+	},
+	/* ssd132x family */
+	{
+		.compatible = "solomon,ssd1322",
+		.data = &ssd130x_variants[SSD1322_ID],
+	},
+	{
+		.compatible = "solomon,ssd1325",
+		.data = &ssd130x_variants[SSD1325_ID],
+	},
+	{
+		.compatible = "solomon,ssd1327",
+		.data = &ssd130x_variants[SSD1327_ID],
+	},
+	/* ssd133x family */
+	{
+		.compatible = "solomon,ssd1331",
+		.data = &ssd130x_variants[SSD1331_ID],
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ssd130x_of_match);
+
+/*
+ * The SPI core always reports a MODALIAS uevent of the form "spi:<dev>", even
+ * if the device was registered via OF. This means that the module will not be
+ * auto loaded, unless it contains an alias that matches the MODALIAS reported.
+ *
+ * To workaround this issue, add a SPI device ID table. Even when this should
+ * not be needed for this driver to match the registered SPI devices.
+ */
+static const struct spi_device_id ssd130x_spi_id[] = {
+	/* ssd130x family */
+	{ "sh1106",  SH1106_ID },
+	{ "ssd1305", SSD1305_ID },
+	{ "ssd1306", SSD1306_ID },
+	{ "ssd1307", SSD1307_ID },
+	{ "ssd1309", SSD1309_ID },
+	/* ssd132x family */
+	{ "ssd1322", SSD1322_ID },
+	{ "ssd1325", SSD1325_ID },
+	{ "ssd1327", SSD1327_ID },
+	/* ssd133x family */
+	{ "ssd1331", SSD1331_ID },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, ssd130x_spi_id);
+
+static struct spi_driver ssd130x_spi_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = ssd130x_of_match,
+	},
+	.id_table = ssd130x_spi_id,
+	.probe = ssd130x_spi_probe,
+	.remove = ssd130x_spi_remove,
+	.shutdown = ssd130x_spi_shutdown,
+};
+module_spi_driver(ssd130x_spi_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Javier Martinez Canillas <javierm@redhat.com>");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("DRM_SSD130X");

linux-7.2.3/drivers/gpu/drm/solomon/ssd130x.h

@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Header file for:
+ * DRM driver for Solomon SSD130x OLED displays
+ *
+ * Copyright 2022 Red Hat Inc.
+ * Author: Javier Martinez Canillas <javierm@redhat.com>
+ *
+ * Based on drivers/video/fbdev/ssd1307fb.c
+ * Copyright 2012 Free Electrons
+ */
+
+#ifndef __SSD130X_H__
+#define __SSD130X_H__
+
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+
+#include <linux/regmap.h>
+
+#define SSD13XX_DATA				0x40
+#define SSD13XX_COMMAND				0x80
+
+enum ssd130x_family_ids {
+	SSD130X_FAMILY,
+	SSD132X_FAMILY,
+	SSD133X_FAMILY
+};
+
+enum ssd130x_variants {
+	/* ssd130x family */
+	SH1106_ID,
+	SSD1305_ID,
+	SSD1306_ID,
+	SSD1307_ID,
+	SSD1309_ID,
+	/* ssd132x family */
+	SSD1322_ID,
+	SSD1325_ID,
+	SSD1327_ID,
+	/* ssd133x family */
+	SSD1331_ID,
+	NR_SSD130X_VARIANTS
+};
+
+struct ssd130x_deviceinfo {
+	u32 default_vcomh;
+	u32 default_dclk_div;
+	u32 default_dclk_frq;
+	u32 default_width;
+	u32 default_height;
+	bool need_pwm;
+	bool need_chargepump;
+	bool page_mode_only;
+
+	enum ssd130x_family_ids family_id;
+};
+
+struct ssd130x_device {
+	struct drm_device drm;
+	struct device *dev;
+	struct drm_display_mode mode;
+	struct drm_plane primary_plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+	struct i2c_client *client;
+
+	struct regmap *regmap;
+
+	const struct ssd130x_deviceinfo *device_info;
+
+	unsigned page_address_mode : 1;
+	unsigned area_color_enable : 1;
+	unsigned com_invdir : 1;
+	unsigned com_lrremap : 1;
+	unsigned com_seq : 1;
+	unsigned lookup_table_set : 1;
+	unsigned low_power : 1;
+	unsigned seg_remap : 1;
+	u32 com_offset;
+	u32 contrast;
+	u32 dclk_div;
+	u32 dclk_frq;
+	u32 height;
+	u8 lookup_table[4];
+	u32 page_offset;
+	u32 col_offset;
+	u32 prechargep1;
+	u32 prechargep2;
+
+	struct backlight_device *bl_dev;
+	struct pwm_device *pwm;
+	struct gpio_desc *reset;
+	struct regulator *vcc_reg;
+	u32 vcomh;
+	u32 width;
+	/* Cached address ranges */
+	u8 col_start;
+	u8 col_end;
+	u8 page_start;
+	u8 page_end;
+};
+
+extern const struct ssd130x_deviceinfo ssd130x_variants[];
+
+struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap);
+void ssd130x_remove(struct ssd130x_device *ssd130x);
+void ssd130x_shutdown(struct ssd130x_device *ssd130x);
+
+#endif /* __SSD130X_H__ */