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: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
Родитель
aead40ea0b
Коммит
280921de72
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@ -61,3 +61,4 @@ obj-$(CONFIG_DRM_QXL) += qxl/
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obj-$(CONFIG_DRM_MSM) += msm/
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obj-$(CONFIG_DRM_TEGRA) += tegra/
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obj-y += i2c/
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obj-y += panel/
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@ -3,3 +3,17 @@ config DRM_PANEL
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depends on DRM
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help
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Panel registration and lookup framework.
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menu "Display Panels"
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depends on DRM_PANEL
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config DRM_PANEL_SIMPLE
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tristate "support for simple panels"
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depends on OF
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help
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DRM panel driver for dumb panels that need at most a regulator and
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a GPIO to be powered up. Optionally a backlight can be attached so
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that it can be automatically turned off when the panel goes into a
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low power state.
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endmenu
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@ -0,0 +1 @@
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obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
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@ -0,0 +1,417 @@
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/*
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* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/backlight.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_panel.h>
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struct panel_desc {
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const struct drm_display_mode *modes;
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unsigned int num_modes;
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struct {
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unsigned int width;
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unsigned int height;
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} size;
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};
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/* TODO: convert to gpiod_*() API once it's been merged */
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#define GPIO_ACTIVE_LOW (1 << 0)
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struct panel_simple {
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struct drm_panel base;
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bool enabled;
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const struct panel_desc *desc;
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struct backlight_device *backlight;
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struct regulator *supply;
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struct i2c_adapter *ddc;
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unsigned long enable_gpio_flags;
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int enable_gpio;
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};
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static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
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{
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return container_of(panel, struct panel_simple, base);
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}
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static int panel_simple_get_fixed_modes(struct panel_simple *panel)
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{
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struct drm_connector *connector = panel->base.connector;
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struct drm_device *drm = panel->base.drm;
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struct drm_display_mode *mode;
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unsigned int i, num = 0;
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if (!panel->desc)
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return 0;
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for (i = 0; i < panel->desc->num_modes; i++) {
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const struct drm_display_mode *m = &panel->desc->modes[i];
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mode = drm_mode_duplicate(drm, m);
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if (!mode) {
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dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
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m->hdisplay, m->vdisplay, m->vrefresh);
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continue;
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}
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drm_mode_set_name(mode);
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drm_mode_probed_add(connector, mode);
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num++;
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}
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connector->display_info.width_mm = panel->desc->size.width;
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connector->display_info.height_mm = panel->desc->size.height;
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return num;
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}
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static int panel_simple_disable(struct drm_panel *panel)
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{
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struct panel_simple *p = to_panel_simple(panel);
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if (!p->enabled)
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return 0;
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if (p->backlight) {
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p->backlight->props.power = FB_BLANK_POWERDOWN;
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backlight_update_status(p->backlight);
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}
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if (gpio_is_valid(p->enable_gpio)) {
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if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
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gpio_set_value(p->enable_gpio, 1);
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else
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gpio_set_value(p->enable_gpio, 0);
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}
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regulator_disable(p->supply);
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p->enabled = false;
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return 0;
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}
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static int panel_simple_enable(struct drm_panel *panel)
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{
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struct panel_simple *p = to_panel_simple(panel);
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int err;
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if (p->enabled)
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return 0;
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err = regulator_enable(p->supply);
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if (err < 0) {
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dev_err(panel->dev, "failed to enable supply: %d\n", err);
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return err;
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}
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if (gpio_is_valid(p->enable_gpio)) {
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if (p->enable_gpio_flags & GPIO_ACTIVE_LOW)
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gpio_set_value(p->enable_gpio, 0);
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else
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gpio_set_value(p->enable_gpio, 1);
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}
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if (p->backlight) {
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p->backlight->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(p->backlight);
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}
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p->enabled = true;
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return 0;
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}
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static int panel_simple_get_modes(struct drm_panel *panel)
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{
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struct panel_simple *p = to_panel_simple(panel);
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int num = 0;
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/* probe EDID if a DDC bus is available */
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if (p->ddc) {
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struct edid *edid = drm_get_edid(panel->connector, p->ddc);
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if (edid) {
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num += drm_add_edid_modes(panel->connector, edid);
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kfree(edid);
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}
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}
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/* add hard-coded panel modes */
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num += panel_simple_get_fixed_modes(p);
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return num;
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}
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static const struct drm_panel_funcs panel_simple_funcs = {
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.disable = panel_simple_disable,
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.enable = panel_simple_enable,
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.get_modes = panel_simple_get_modes,
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};
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static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
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{
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struct device_node *backlight, *ddc;
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struct panel_simple *panel;
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enum of_gpio_flags flags;
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int err;
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panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
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if (!panel)
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return -ENOMEM;
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panel->enabled = false;
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panel->desc = desc;
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panel->supply = devm_regulator_get(dev, "power");
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if (IS_ERR(panel->supply))
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return PTR_ERR(panel->supply);
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panel->enable_gpio = of_get_named_gpio_flags(dev->of_node,
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"enable-gpios", 0,
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&flags);
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if (gpio_is_valid(panel->enable_gpio)) {
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unsigned int value;
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if (flags & OF_GPIO_ACTIVE_LOW)
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panel->enable_gpio_flags |= GPIO_ACTIVE_LOW;
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err = gpio_request(panel->enable_gpio, "enable");
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if (err < 0) {
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dev_err(dev, "failed to request GPIO#%u: %d\n",
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panel->enable_gpio, err);
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return err;
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}
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value = (panel->enable_gpio_flags & GPIO_ACTIVE_LOW) != 0;
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err = gpio_direction_output(panel->enable_gpio, value);
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if (err < 0) {
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dev_err(dev, "failed to setup GPIO%u: %d\n",
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panel->enable_gpio, err);
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goto free_gpio;
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}
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}
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backlight = of_parse_phandle(dev->of_node, "backlight", 0);
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if (backlight) {
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panel->backlight = of_find_backlight_by_node(backlight);
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of_node_put(backlight);
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if (!panel->backlight) {
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err = -EPROBE_DEFER;
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goto free_gpio;
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}
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}
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ddc = of_parse_phandle(dev->of_node, "ddc-i2c-bus", 0);
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if (ddc) {
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panel->ddc = of_find_i2c_adapter_by_node(ddc);
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of_node_put(ddc);
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if (!panel->ddc) {
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err = -EPROBE_DEFER;
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goto free_backlight;
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}
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}
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drm_panel_init(&panel->base);
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panel->base.dev = dev;
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panel->base.funcs = &panel_simple_funcs;
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err = drm_panel_add(&panel->base);
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if (err < 0)
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goto free_ddc;
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dev_set_drvdata(dev, panel);
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return 0;
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free_ddc:
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if (panel->ddc)
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put_device(&panel->ddc->dev);
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free_backlight:
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if (panel->backlight)
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put_device(&panel->backlight->dev);
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free_gpio:
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if (gpio_is_valid(panel->enable_gpio))
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gpio_free(panel->enable_gpio);
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return err;
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}
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static int panel_simple_remove(struct device *dev)
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{
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struct panel_simple *panel = dev_get_drvdata(dev);
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drm_panel_detach(&panel->base);
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drm_panel_remove(&panel->base);
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panel_simple_disable(&panel->base);
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if (panel->ddc)
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put_device(&panel->ddc->dev);
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if (panel->backlight)
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put_device(&panel->backlight->dev);
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if (gpio_is_valid(panel->enable_gpio))
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gpio_free(panel->enable_gpio);
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regulator_disable(panel->supply);
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return 0;
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}
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static const struct drm_display_mode auo_b101aw03_mode = {
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.clock = 51450,
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.hdisplay = 1024,
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.hsync_start = 1024 + 156,
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.hsync_end = 1024 + 156 + 8,
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.htotal = 1024 + 156 + 8 + 156,
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.vdisplay = 600,
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.vsync_start = 600 + 16,
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.vsync_end = 600 + 16 + 6,
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.vtotal = 600 + 16 + 6 + 16,
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.vrefresh = 60,
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};
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static const struct panel_desc auo_b101aw03 = {
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.modes = &auo_b101aw03_mode,
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.num_modes = 1,
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.size = {
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.width = 223,
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.height = 125,
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},
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};
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static const struct drm_display_mode chunghwa_claa101wb01_mode = {
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.clock = 69300,
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.hdisplay = 1366,
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.hsync_start = 1366 + 48,
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.hsync_end = 1366 + 48 + 32,
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.htotal = 1366 + 48 + 32 + 20,
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.vdisplay = 768,
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.vsync_start = 768 + 16,
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.vsync_end = 768 + 16 + 8,
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.vtotal = 768 + 16 + 8 + 16,
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.vrefresh = 60,
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};
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static const struct panel_desc chunghwa_claa101wb01 = {
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.modes = &chunghwa_claa101wb01_mode,
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.num_modes = 1,
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.size = {
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.width = 223,
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.height = 125,
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},
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};
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static const struct of_device_id platform_of_match[] = {
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{
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.compatible = "auo,b101aw03",
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.data = &auo_b101aw03,
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}, {
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.compatible = "chunghwa,claa101wb01",
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.data = &chunghwa_claa101wb01
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}, {
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.compatible = "simple-panel",
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(of, platform_of_match);
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static int panel_simple_platform_probe(struct platform_device *pdev)
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{
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const struct of_device_id *id;
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id = of_match_node(platform_of_match, pdev->dev.of_node);
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if (!id)
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return -ENODEV;
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return panel_simple_probe(&pdev->dev, id->data);
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}
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static int panel_simple_platform_remove(struct platform_device *pdev)
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{
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return panel_simple_remove(&pdev->dev);
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}
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static struct platform_driver panel_simple_platform_driver = {
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.driver = {
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.name = "panel-simple",
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.owner = THIS_MODULE,
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.of_match_table = platform_of_match,
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},
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.probe = panel_simple_platform_probe,
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.remove = panel_simple_platform_remove,
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};
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static const struct drm_display_mode panasonic_vvx10f004b00_mode = {
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.clock = 157200,
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.hdisplay = 1920,
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.hsync_start = 1920 + 154,
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.hsync_end = 1920 + 154 + 16,
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.htotal = 1920 + 154 + 16 + 32,
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.vdisplay = 1200,
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.vsync_start = 1200 + 17,
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.vsync_end = 1200 + 17 + 2,
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.vtotal = 1200 + 17 + 2 + 16,
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.vrefresh = 60,
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};
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static const struct panel_desc panasonic_vvx10f004b00 = {
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.modes = &panasonic_vvx10f004b00_mode,
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.num_modes = 1,
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.size = {
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.width = 217,
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.height = 136,
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},
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};
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static int __init panel_simple_init(void)
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{
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return platform_driver_register(&panel_simple_platform_driver);
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}
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module_init(panel_simple_init);
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static void __exit panel_simple_exit(void)
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{
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platform_driver_unregister(&panel_simple_platform_driver);
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}
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module_exit(panel_simple_exit);
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MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
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MODULE_DESCRIPTION("DRM Driver for Simple Panels");
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MODULE_LICENSE("GPL and additional rights");
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