kernel_samsung_a34x-permissive/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c

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/*
* Copyright (C) 2012 Texas Instruments
* Author: Rob Clark <robdclark@gmail.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.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <drm/drm_atomic_helper.h>
#include "tilcdc_drv.h"
#include "tilcdc_tfp410.h"
struct tfp410_module {
struct tilcdc_module base;
struct i2c_adapter *i2c;
int gpio;
};
#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
static const struct tilcdc_panel_info dvi_info = {
.ac_bias = 255,
.ac_bias_intrpt = 0,
.dma_burst_sz = 16,
.bpp = 16,
.fdd = 0x80,
.tft_alt_mode = 0,
.sync_edge = 0,
.sync_ctrl = 1,
.raster_order = 0,
};
/*
* Encoder:
*/
struct tfp410_encoder {
struct drm_encoder base;
struct tfp410_module *mod;
int dpms;
};
#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
{
struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
if (tfp410_encoder->dpms == mode)
return;
if (mode == DRM_MODE_DPMS_ON) {
DBG("Power on");
gpio_direction_output(tfp410_encoder->mod->gpio, 1);
} else {
DBG("Power off");
gpio_direction_output(tfp410_encoder->mod->gpio, 0);
}
tfp410_encoder->dpms = mode;
}
static void tfp410_encoder_prepare(struct drm_encoder *encoder)
{
tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}
static void tfp410_encoder_commit(struct drm_encoder *encoder)
{
tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}
static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
/* nothing needed */
}
static const struct drm_encoder_funcs tfp410_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
.dpms = tfp410_encoder_dpms,
.prepare = tfp410_encoder_prepare,
.commit = tfp410_encoder_commit,
.mode_set = tfp410_encoder_mode_set,
};
static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
struct tfp410_module *mod)
{
struct tfp410_encoder *tfp410_encoder;
struct drm_encoder *encoder;
int ret;
tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
GFP_KERNEL);
if (!tfp410_encoder)
return NULL;
tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
tfp410_encoder->mod = mod;
encoder = &tfp410_encoder->base;
encoder->possible_crtcs = 1;
ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
if (ret < 0)
goto fail;
drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
return encoder;
fail:
drm_encoder_cleanup(encoder);
return NULL;
}
/*
* Connector:
*/
struct tfp410_connector {
struct drm_connector base;
struct drm_encoder *encoder; /* our connected encoder */
struct tfp410_module *mod;
};
#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
static void tfp410_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static enum drm_connector_status tfp410_connector_detect(
struct drm_connector *connector,
bool force)
{
struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
if (drm_probe_ddc(tfp410_connector->mod->i2c))
return connector_status_connected;
return connector_status_unknown;
}
static int tfp410_connector_get_modes(struct drm_connector *connector)
{
struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
struct edid *edid;
int ret = 0;
edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
drm_connector_update_edid_property(connector, edid);
if (edid) {
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
}
return ret;
}
static int tfp410_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct tilcdc_drm_private *priv = connector->dev->dev_private;
/* our only constraints are what the crtc can generate: */
return tilcdc_crtc_mode_valid(priv->crtc, mode);
}
static struct drm_encoder *tfp410_connector_best_encoder(
struct drm_connector *connector)
{
struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
return tfp410_connector->encoder;
}
static const struct drm_connector_funcs tfp410_connector_funcs = {
.destroy = tfp410_connector_destroy,
.detect = tfp410_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
.get_modes = tfp410_connector_get_modes,
.mode_valid = tfp410_connector_mode_valid,
.best_encoder = tfp410_connector_best_encoder,
};
static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
struct tfp410_module *mod, struct drm_encoder *encoder)
{
struct tfp410_connector *tfp410_connector;
struct drm_connector *connector;
int ret;
tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
GFP_KERNEL);
if (!tfp410_connector)
return NULL;
tfp410_connector->encoder = encoder;
tfp410_connector->mod = mod;
connector = &tfp410_connector->base;
drm_connector_init(dev, connector, &tfp410_connector_funcs,
DRM_MODE_CONNECTOR_DVID);
drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
connector->interlace_allowed = 0;
connector->doublescan_allowed = 0;
ret = drm_connector_attach_encoder(connector, encoder);
if (ret)
goto fail;
return connector;
fail:
tfp410_connector_destroy(connector);
return NULL;
}
/*
* Module:
*/
static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
{
struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
struct tilcdc_drm_private *priv = dev->dev_private;
struct drm_encoder *encoder;
struct drm_connector *connector;
encoder = tfp410_encoder_create(dev, tfp410_mod);
if (!encoder)
return -ENOMEM;
connector = tfp410_connector_create(dev, tfp410_mod, encoder);
if (!connector)
return -ENOMEM;
priv->encoders[priv->num_encoders++] = encoder;
priv->connectors[priv->num_connectors++] = connector;
tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
return 0;
}
static const struct tilcdc_module_ops tfp410_module_ops = {
.modeset_init = tfp410_modeset_init,
};
/*
* Device:
*/
static int tfp410_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct device_node *i2c_node;
struct tfp410_module *tfp410_mod;
struct tilcdc_module *mod;
struct pinctrl *pinctrl;
uint32_t i2c_phandle;
int ret = -EINVAL;
/* bail out early if no DT data: */
if (!node) {
dev_err(&pdev->dev, "device-tree data is missing\n");
return -ENXIO;
}
tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
if (!tfp410_mod)
return -ENOMEM;
mod = &tfp410_mod->base;
pdev->dev.platform_data = mod;
tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl))
dev_warn(&pdev->dev, "pins are not configured\n");
if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
dev_err(&pdev->dev, "could not get i2c bus phandle\n");
goto fail;
}
i2c_node = of_find_node_by_phandle(i2c_phandle);
if (!i2c_node) {
dev_err(&pdev->dev, "could not get i2c bus node\n");
goto fail;
}
tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
if (!tfp410_mod->i2c) {
dev_err(&pdev->dev, "could not get i2c\n");
of_node_put(i2c_node);
goto fail;
}
of_node_put(i2c_node);
tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
0, NULL);
if (tfp410_mod->gpio < 0) {
dev_warn(&pdev->dev, "No power down GPIO\n");
} else {
ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
if (ret) {
dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
goto fail_adapter;
}
}
return 0;
fail_adapter:
i2c_put_adapter(tfp410_mod->i2c);
fail:
tilcdc_module_cleanup(mod);
return ret;
}
static int tfp410_remove(struct platform_device *pdev)
{
struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
i2c_put_adapter(tfp410_mod->i2c);
gpio_free(tfp410_mod->gpio);
tilcdc_module_cleanup(mod);
return 0;
}
static const struct of_device_id tfp410_of_match[] = {
{ .compatible = "ti,tilcdc,tfp410", },
{ },
};
struct platform_driver tfp410_driver = {
.probe = tfp410_probe,
.remove = tfp410_remove,
.driver = {
.owner = THIS_MODULE,
.name = "tfp410",
.of_match_table = tfp410_of_match,
},
};
int __init tilcdc_tfp410_init(void)
{
return platform_driver_register(&tfp410_driver);
}
void __exit tilcdc_tfp410_fini(void)
{
platform_driver_unregister(&tfp410_driver);
}