Commit 280921de authored by Thierry Reding's avatar Thierry Reding

drm/panel: Add simple panel support

Add a driver for simple panels. Such panels can have a regulator that
provides the supply voltage and a separate GPIO to enable the panel.
Optionally the panels can have a backlight associated with them so it
can be enabled or disabled according to the panel's power management
mode.

Support is added for two panels: An AU Optronics 10.1" WSVGA and a
Chunghwa Picture Tubes 10.1" WXGA panel.
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent aead40ea
......@@ -61,3 +61,4 @@ obj-$(CONFIG_DRM_QXL) += qxl/
obj-$(CONFIG_DRM_MSM) += msm/
obj-$(CONFIG_DRM_TEGRA) += tegra/
obj-y += i2c/
obj-y += panel/
......@@ -3,3 +3,17 @@ config DRM_PANEL
depends on DRM
help
Panel registration and lookup framework.
menu "Display Panels"
depends on DRM_PANEL
config DRM_PANEL_SIMPLE
tristate "support for simple panels"
depends on OF
help
DRM panel driver for dumb panels that need at most a regulator and
a GPIO to be powered up. Optionally a backlight can be attached so
that it can be automatically turned off when the panel goes into a
low power state.
endmenu
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
/*
* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <linux/backlight.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_panel.h>
struct panel_desc {
const struct drm_display_mode *modes;
unsigned int num_modes;
struct {
unsigned int width;
unsigned int height;
} size;
};
/* TODO: convert to gpiod_*() API once it's been merged */
#define GPIO_ACTIVE_LOW (1 << 0)
struct panel_simple {
struct drm_panel base;
bool enabled;
const struct panel_desc *desc;
struct backlight_device *backlight;
struct regulator *supply;
struct i2c_adapter *ddc;
unsigned long enable_gpio_flags;
int enable_gpio;
};
static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
{
return container_of(panel, struct panel_simple, base);
}
static int panel_simple_get_fixed_modes(struct panel_simple *panel)
{
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
struct drm_display_mode *mode;
unsigned int i, num = 0;
if (!panel->desc)
return 0;
for (i = 0; i < panel->desc->num_modes; i++) {
const struct drm_display_mode *m = &panel->desc->modes[i];
mode = drm_mode_duplicate(drm, m);
if (!mode) {
dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
m->hdisplay, m->vdisplay, m->vrefresh);
continue;
}
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
num++;
}
connector->display_info.width_mm = panel->desc->size.width;
connector->display_info.height_mm = panel->desc->size.height;
return num;
}
static int panel_simple_disable(struct drm_panel *panel)
{
struct panel_simple *p = to_panel_simple(panel);
if (!p->enabled)
return 0;
if (p->backlight) {
p->backlight->props.power = FB_BLANK_POWERDOWN;
backlight_update_status(p->backlight);
}
if (gpio_is_valid(p->enable_gpio)) {
if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
gpio_set_value(p->enable_gpio, 1);
else
gpio_set_value(p->enable_gpio, 0);
}
regulator_disable(p->supply);
p->enabled = false;
return 0;
}
static int panel_simple_enable(struct drm_panel *panel)
{
struct panel_simple *p = to_panel_simple(panel);
int err;
if (p->enabled)
return 0;
err = regulator_enable(p->supply);
if (err < 0) {
dev_err(panel->dev, "failed to enable supply: %d\n", err);
return err;
}
if (gpio_is_valid(p->enable_gpio)) {
if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
gpio_set_value(p->enable_gpio, 0);
else
gpio_set_value(p->enable_gpio, 1);
}
if (p->backlight) {
p->backlight->props.power = FB_BLANK_UNBLANK;
backlight_update_status(p->backlight);
}
p->enabled = true;
return 0;
}
static int panel_simple_get_modes(struct drm_panel *panel)
{
struct panel_simple *p = to_panel_simple(panel);
int num = 0;
/* probe EDID if a DDC bus is available */
if (p->ddc) {
struct edid *edid = drm_get_edid(panel->connector, p->ddc);
if (edid) {
num += drm_add_edid_modes(panel->connector, edid);
kfree(edid);
}
}
/* add hard-coded panel modes */
num += panel_simple_get_fixed_modes(p);
return num;
}
static const struct drm_panel_funcs panel_simple_funcs = {
.disable = panel_simple_disable,
.enable = panel_simple_enable,
.get_modes = panel_simple_get_modes,
};
static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
{
struct device_node *backlight, *ddc;
struct panel_simple *panel;
enum of_gpio_flags flags;
int err;
panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
if (!panel)
return -ENOMEM;
panel->enabled = false;
panel->desc = desc;
panel->supply = devm_regulator_get(dev, "power");
if (IS_ERR(panel->supply))
return PTR_ERR(panel->supply);
panel->enable_gpio = of_get_named_gpio_flags(dev->of_node,
"enable-gpios", 0,
&flags);
if (gpio_is_valid(panel->enable_gpio)) {
unsigned int value;
if (flags & OF_GPIO_ACTIVE_LOW)
panel->enable_gpio_flags |= GPIO_ACTIVE_LOW;
err = gpio_request(panel->enable_gpio, "enable");
if (err < 0) {
dev_err(dev, "failed to request GPIO#%u: %d\n",
panel->enable_gpio, err);
return err;
}
value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
err = gpio_direction_output(panel->enable_gpio, value);
if (err < 0) {
dev_err(dev, "failed to setup GPIO%u: %d\n",
panel->enable_gpio, err);
goto free_gpio;
}
}
backlight = of_parse_phandle(dev->of_node, "backlight", 0);
if (backlight) {
panel->backlight = of_find_backlight_by_node(backlight);
of_node_put(backlight);
if (!panel->backlight) {
err = -EPROBE_DEFER;
goto free_gpio;
}
}
ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
if (ddc) {
panel->ddc = of_find_i2c_adapter_by_node(ddc);
of_node_put(ddc);
if (!panel->ddc) {
err = -EPROBE_DEFER;
goto free_backlight;
}
}
drm_panel_init(&panel->base);
panel->base.dev = dev;
panel->base.funcs = &panel_simple_funcs;
err = drm_panel_add(&panel->base);
if (err < 0)
goto free_ddc;
dev_set_drvdata(dev, panel);
return 0;
free_ddc:
if (panel->ddc)
put_device(&panel->ddc->dev);
free_backlight:
if (panel->backlight)
put_device(&panel->backlight->dev);
free_gpio:
if (gpio_is_valid(panel->enable_gpio))
gpio_free(panel->enable_gpio);
return err;
}
static int panel_simple_remove(struct device *dev)
{
struct panel_simple *panel = dev_get_drvdata(dev);
drm_panel_detach(&panel->base);
drm_panel_remove(&panel->base);
panel_simple_disable(&panel->base);
if (panel->ddc)
put_device(&panel->ddc->dev);
if (panel->backlight)
put_device(&panel->backlight->dev);
if (gpio_is_valid(panel->enable_gpio))
gpio_free(panel->enable_gpio);
regulator_disable(panel->supply);
return 0;
}
static const struct drm_display_mode auo_b101aw03_mode = {
.clock = 51450,
.hdisplay = 1024,
.hsync_start = 1024 + 156,
.hsync_end = 1024 + 156 + 8,
.htotal = 1024 + 156 + 8 + 156,
.vdisplay = 600,
.vsync_start = 600 + 16,
.vsync_end = 600 + 16 + 6,
.vtotal = 600 + 16 + 6 + 16,
.vrefresh = 60,
};
static const struct panel_desc auo_b101aw03 = {
.modes = &auo_b101aw03_mode,
.num_modes = 1,
.size = {
.width = 223,
.height = 125,
},
};
static const struct drm_display_mode chunghwa_claa101wb01_mode = {
.clock = 69300,
.hdisplay = 1366,
.hsync_start = 1366 + 48,
.hsync_end = 1366 + 48 + 32,
.htotal = 1366 + 48 + 32 + 20,
.vdisplay = 768,
.vsync_start = 768 + 16,
.vsync_end = 768 + 16 + 8,
.vtotal = 768 + 16 + 8 + 16,
.vrefresh = 60,
};
static const struct panel_desc chunghwa_claa101wb01 = {
.modes = &chunghwa_claa101wb01_mode,
.num_modes = 1,
.size = {
.width = 223,
.height = 125,
},
};
static const struct of_device_id platform_of_match[] = {
{
.compatible = "auo,b101aw03",
.data = &auo_b101aw03,
}, {
.compatible = "chunghwa,claa101wb01",
.data = &chunghwa_claa101wb01
}, {
.compatible = "simple-panel",
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, platform_of_match);
static int panel_simple_platform_probe(struct platform_device *pdev)
{
const struct of_device_id *id;
id = of_match_node(platform_of_match, pdev->dev.of_node);
if (!id)
return -ENODEV;
return panel_simple_probe(&pdev->dev, id->data);
}
static int panel_simple_platform_remove(struct platform_device *pdev)
{
return panel_simple_remove(&pdev->dev);
}
static struct platform_driver panel_simple_platform_driver = {
.driver = {
.name = "panel-simple",
.owner = THIS_MODULE,
.of_match_table = platform_of_match,
},
.probe = panel_simple_platform_probe,
.remove = panel_simple_platform_remove,
};
static const struct drm_display_mode panasonic_vvx10f004b00_mode = {
.clock = 157200,
.hdisplay = 1920,
.hsync_start = 1920 + 154,
.hsync_end = 1920 + 154 + 16,
.htotal = 1920 + 154 + 16 + 32,
.vdisplay = 1200,
.vsync_start = 1200 + 17,
.vsync_end = 1200 + 17 + 2,
.vtotal = 1200 + 17 + 2 + 16,
.vrefresh = 60,
};
static const struct panel_desc panasonic_vvx10f004b00 = {
.modes = &panasonic_vvx10f004b00_mode,
.num_modes = 1,
.size = {
.width = 217,
.height = 136,
},
};
static int __init panel_simple_init(void)
{
return platform_driver_register(&panel_simple_platform_driver);
}
module_init(panel_simple_init);
static void __exit panel_simple_exit(void)
{
platform_driver_unregister(&panel_simple_platform_driver);
}
module_exit(panel_simple_exit);
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("DRM Driver for Simple Panels");
MODULE_LICENSE("GPL and additional rights");
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