This driver implements support for VGA Digital to Analog Converters (DACs) that receive pixel data through a DPI interface and have no control interface (GPIOs- and/or regulators-based control can be implemented later when needed). It exposes the devices a display entities.
Signed-off-by: Laurent Pinchart laurent.pinchart+renesas@ideasonboard.com --- drivers/video/display/Kconfig | 9 +++ drivers/video/display/Makefile | 1 + drivers/video/display/vga-dac.c | 152 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 162 insertions(+) create mode 100644 drivers/video/display/vga-dac.c
diff --git a/drivers/video/display/Kconfig b/drivers/video/display/Kconfig index 9b44b5f..32ce08d 100644 --- a/drivers/video/display/Kconfig +++ b/drivers/video/display/Kconfig @@ -39,4 +39,13 @@ config DISPLAY_PANEL_R61517 If you are in doubt, say N. To compile this driver as a module, choose M here; the module will be called panel-r61517.
+config DISPLAY_VGA_DAC + tristate "VGA Digital to Analog Converters" + ---help--- + Support for simple VGA digital to analog converters. Those converters + receive pixel data through a parallel bus and have no control bus. + + If you are in doubt, say N. To compile this driver as a module, choose + M here: the module will be called vga-dac. + endif # DISPLAY_CORE diff --git a/drivers/video/display/Makefile b/drivers/video/display/Makefile index 1cdc8d4..43cd78d 100644 --- a/drivers/video/display/Makefile +++ b/drivers/video/display/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_DISPLAY_MIPI_DBI) += mipi-dbi-bus.o obj-$(CONFIG_DISPLAY_PANEL_DPI) += panel-dpi.o obj-$(CONFIG_DISPLAY_PANEL_R61505) += panel-r61505.o obj-$(CONFIG_DISPLAY_PANEL_R61517) += panel-r61517.o +obj-$(CONFIG_DISPLAY_VGA_DAC) += vga-dac.o diff --git a/drivers/video/display/vga-dac.c b/drivers/video/display/vga-dac.c new file mode 100644 index 0000000..d0256e6 --- /dev/null +++ b/drivers/video/display/vga-dac.c @@ -0,0 +1,152 @@ +/* + * VGA Digital to Analog Converter + * + * Copyright (C) 2013 Renesas Solutions Corp. + * + * Contacts: Laurent Pinchart laurent.pinchart@ideasonboard.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <video/display.h> + +#define VGA_DAC_PORT_SINK 0 +#define VGA_DAC_PORT_SOURCE 1 + +struct vga_dac { + struct display_entity entity; +}; + +static inline struct vga_dac *to_vga_dac(struct display_entity *e) +{ + return container_of(e, struct vga_dac, entity); +} + +static int vga_dac_set_state(struct display_entity *entity, + enum display_entity_state state) +{ + struct media_pad *source; + + source = media_entity_remote_pad(&entity->entity.pads[0]); + if (source == NULL) + return -EPIPE; + + switch (state) { + case DISPLAY_ENTITY_STATE_OFF: + case DISPLAY_ENTITY_STATE_STANDBY: + display_entity_set_stream(to_display_entity(source->entity), + source->index, + DISPLAY_ENTITY_STREAM_STOPPED); + break; + + case DISPLAY_ENTITY_STATE_ON: + display_entity_set_stream(to_display_entity(source->entity), + source->index, + DISPLAY_ENTITY_STREAM_CONTINUOUS); + break; + } + + return 0; +} + +static int vga_dac_get_params(struct display_entity *entity, unsigned int port, + struct display_entity_interface_params *params) +{ + memset(params, 0, sizeof(*params)); + + if (port == VGA_DAC_PORT_SINK) + params->type = DISPLAY_ENTITY_INTERFACE_DPI; + else + params->type = DISPLAY_ENTITY_INTERFACE_VGA; + + return 0; +} + +static const struct display_entity_control_ops vga_dac_control_ops = { + .set_state = vga_dac_set_state, + .get_params = vga_dac_get_params, +}; + +static const struct display_entity_ops vga_dac_ops = { + .ctrl = &vga_dac_control_ops, +}; + +static int vga_dac_remove(struct platform_device *pdev) +{ + struct vga_dac *dac = platform_get_drvdata(pdev); + + display_entity_remove(&dac->entity); + display_entity_cleanup(&dac->entity); + + return 0; +} + +static int vga_dac_probe(struct platform_device *pdev) +{ + struct vga_dac *dac; + int ret; + + dac = devm_kzalloc(&pdev->dev, sizeof(*dac), GFP_KERNEL); + if (dac == NULL) + return -ENOMEM; + + dac->entity.dev = &pdev->dev; + dac->entity.ops = &vga_dac_ops; + strlcpy(dac->entity.name, dev_name(&pdev->dev), + sizeof(dac->entity.name)); + + ret = display_entity_init(&dac->entity, 1, 1); + if (ret < 0) + return ret; + + ret = display_entity_add(&dac->entity); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, dac); + + return 0; +} + +static const struct dev_pm_ops vga_dac_dev_pm_ops = { +}; + +static struct platform_device_id vga_dac_id_table[] = { + { "adv7123", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(platform, vga_dac_id_table); + +#ifdef CONFIG_OF +static struct of_device_id vga_dac_of_id_table[] = { + { .compatible = "adi,adv7123", }, + { }, +}; +MODULE_DEVICE_TABLE(of, vga_dac_of_id_table); +#endif + +static struct platform_driver vga_dac_driver = { + .probe = vga_dac_probe, + .remove = vga_dac_remove, + .id_table = vga_dac_id_table, + .driver = { + .name = "vga-dac", + .owner = THIS_MODULE, + .pm = &vga_dac_dev_pm_ops, + .of_match_table = of_match_ptr(vga_dac_of_id_table), + }, +}; + +module_platform_driver(vga_dac_driver); + +MODULE_AUTHOR("Laurent Pinchart laurent.pinchart@ideasonboard.com"); +MODULE_DESCRIPTION("VGA Digital-to-Analog Converter"); +MODULE_LICENSE("GPL");