420 lines
10 KiB
C
420 lines
10 KiB
C
/*
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* Copyright (C) 2012 Texas Instruments
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/i2c.h>
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#include <linux/of_i2c.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/pinctrl/consumer.h>
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#include "tilcdc_drv.h"
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struct tfp410_module {
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struct tilcdc_module base;
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struct i2c_adapter *i2c;
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int gpio;
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};
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#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
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static const struct tilcdc_panel_info dvi_info = {
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.ac_bias = 255,
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.ac_bias_intrpt = 0,
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.dma_burst_sz = 16,
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.bpp = 16,
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.fdd = 0x80,
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.tft_alt_mode = 0,
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.sync_edge = 0,
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.sync_ctrl = 1,
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.raster_order = 0,
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};
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/*
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* Encoder:
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*/
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struct tfp410_encoder {
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struct drm_encoder base;
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struct tfp410_module *mod;
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int dpms;
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};
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#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
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static void tfp410_encoder_destroy(struct drm_encoder *encoder)
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{
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struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
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drm_encoder_cleanup(encoder);
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kfree(tfp410_encoder);
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}
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static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
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{
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struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
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if (tfp410_encoder->dpms == mode)
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return;
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if (mode == DRM_MODE_DPMS_ON) {
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DBG("Power on");
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gpio_direction_output(tfp410_encoder->mod->gpio, 1);
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} else {
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DBG("Power off");
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gpio_direction_output(tfp410_encoder->mod->gpio, 0);
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}
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tfp410_encoder->dpms = mode;
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}
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static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
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const struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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/* nothing needed */
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return true;
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}
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static void tfp410_encoder_prepare(struct drm_encoder *encoder)
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{
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tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
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tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
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}
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static void tfp410_encoder_commit(struct drm_encoder *encoder)
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{
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tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
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}
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static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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/* nothing needed */
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}
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static const struct drm_encoder_funcs tfp410_encoder_funcs = {
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.destroy = tfp410_encoder_destroy,
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};
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static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
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.dpms = tfp410_encoder_dpms,
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.mode_fixup = tfp410_encoder_mode_fixup,
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.prepare = tfp410_encoder_prepare,
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.commit = tfp410_encoder_commit,
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.mode_set = tfp410_encoder_mode_set,
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};
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static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
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struct tfp410_module *mod)
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{
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struct tfp410_encoder *tfp410_encoder;
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struct drm_encoder *encoder;
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int ret;
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tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
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if (!tfp410_encoder) {
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dev_err(dev->dev, "allocation failed\n");
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return NULL;
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}
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tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
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tfp410_encoder->mod = mod;
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encoder = &tfp410_encoder->base;
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encoder->possible_crtcs = 1;
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ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
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DRM_MODE_ENCODER_TMDS);
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if (ret < 0)
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goto fail;
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drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
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return encoder;
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fail:
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tfp410_encoder_destroy(encoder);
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return NULL;
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}
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/*
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* Connector:
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*/
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struct tfp410_connector {
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struct drm_connector base;
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struct drm_encoder *encoder; /* our connected encoder */
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struct tfp410_module *mod;
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};
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#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
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static void tfp410_connector_destroy(struct drm_connector *connector)
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{
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struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
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drm_connector_cleanup(connector);
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kfree(tfp410_connector);
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}
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static enum drm_connector_status tfp410_connector_detect(
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struct drm_connector *connector,
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bool force)
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{
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struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
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if (drm_probe_ddc(tfp410_connector->mod->i2c))
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return connector_status_connected;
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return connector_status_unknown;
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}
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static int tfp410_connector_get_modes(struct drm_connector *connector)
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{
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struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
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struct edid *edid;
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int ret = 0;
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edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
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drm_mode_connector_update_edid_property(connector, edid);
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if (edid) {
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ret = drm_add_edid_modes(connector, edid);
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kfree(edid);
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}
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return ret;
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}
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static int tfp410_connector_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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struct tilcdc_drm_private *priv = connector->dev->dev_private;
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/* our only constraints are what the crtc can generate: */
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return tilcdc_crtc_mode_valid(priv->crtc, mode);
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}
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static struct drm_encoder *tfp410_connector_best_encoder(
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struct drm_connector *connector)
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{
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struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
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return tfp410_connector->encoder;
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}
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static const struct drm_connector_funcs tfp410_connector_funcs = {
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.destroy = tfp410_connector_destroy,
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.dpms = drm_helper_connector_dpms,
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.detect = tfp410_connector_detect,
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.fill_modes = drm_helper_probe_single_connector_modes,
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};
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static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
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.get_modes = tfp410_connector_get_modes,
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.mode_valid = tfp410_connector_mode_valid,
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.best_encoder = tfp410_connector_best_encoder,
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};
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static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
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struct tfp410_module *mod, struct drm_encoder *encoder)
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{
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struct tfp410_connector *tfp410_connector;
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struct drm_connector *connector;
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int ret;
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tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
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if (!tfp410_connector) {
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dev_err(dev->dev, "allocation failed\n");
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return NULL;
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}
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tfp410_connector->encoder = encoder;
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tfp410_connector->mod = mod;
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connector = &tfp410_connector->base;
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drm_connector_init(dev, connector, &tfp410_connector_funcs,
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DRM_MODE_CONNECTOR_DVID);
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drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
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connector->polled = DRM_CONNECTOR_POLL_CONNECT |
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DRM_CONNECTOR_POLL_DISCONNECT;
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connector->interlace_allowed = 0;
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connector->doublescan_allowed = 0;
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ret = drm_mode_connector_attach_encoder(connector, encoder);
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if (ret)
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goto fail;
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drm_sysfs_connector_add(connector);
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return connector;
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fail:
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tfp410_connector_destroy(connector);
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return NULL;
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}
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/*
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* Module:
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*/
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static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
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{
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struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
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struct tilcdc_drm_private *priv = dev->dev_private;
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struct drm_encoder *encoder;
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struct drm_connector *connector;
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encoder = tfp410_encoder_create(dev, tfp410_mod);
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if (!encoder)
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return -ENOMEM;
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connector = tfp410_connector_create(dev, tfp410_mod, encoder);
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if (!connector)
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return -ENOMEM;
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priv->encoders[priv->num_encoders++] = encoder;
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priv->connectors[priv->num_connectors++] = connector;
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return 0;
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}
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static void tfp410_destroy(struct tilcdc_module *mod)
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{
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struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
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if (tfp410_mod->i2c)
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i2c_put_adapter(tfp410_mod->i2c);
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if (!IS_ERR_VALUE(tfp410_mod->gpio))
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gpio_free(tfp410_mod->gpio);
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tilcdc_module_cleanup(mod);
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kfree(tfp410_mod);
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}
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static const struct tilcdc_module_ops tfp410_module_ops = {
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.modeset_init = tfp410_modeset_init,
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.destroy = tfp410_destroy,
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};
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/*
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* Device:
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*/
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static struct of_device_id tfp410_of_match[];
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static int tfp410_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct device_node *i2c_node;
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struct tfp410_module *tfp410_mod;
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struct tilcdc_module *mod;
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struct pinctrl *pinctrl;
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uint32_t i2c_phandle;
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int ret = -EINVAL;
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/* bail out early if no DT data: */
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if (!node) {
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dev_err(&pdev->dev, "device-tree data is missing\n");
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return -ENXIO;
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}
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tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
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if (!tfp410_mod)
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return -ENOMEM;
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mod = &tfp410_mod->base;
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tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
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pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
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if (IS_ERR(pinctrl))
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dev_warn(&pdev->dev, "pins are not configured\n");
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if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
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dev_err(&pdev->dev, "could not get i2c bus phandle\n");
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goto fail;
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}
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i2c_node = of_find_node_by_phandle(i2c_phandle);
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if (!i2c_node) {
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dev_err(&pdev->dev, "could not get i2c bus node\n");
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goto fail;
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}
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tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
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if (!tfp410_mod->i2c) {
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dev_err(&pdev->dev, "could not get i2c\n");
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goto fail;
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}
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of_node_put(i2c_node);
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tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
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0, NULL);
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if (IS_ERR_VALUE(tfp410_mod->gpio)) {
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dev_warn(&pdev->dev, "No power down GPIO\n");
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} else {
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ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
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if (ret) {
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dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
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goto fail;
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}
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}
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return 0;
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fail:
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tfp410_destroy(mod);
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return ret;
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}
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static int tfp410_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static struct of_device_id tfp410_of_match[] = {
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{ .compatible = "ti,tilcdc,tfp410", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, tfp410_of_match);
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struct platform_driver tfp410_driver = {
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.probe = tfp410_probe,
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.remove = tfp410_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "tfp410",
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.of_match_table = tfp410_of_match,
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},
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};
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int __init tilcdc_tfp410_init(void)
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{
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return platform_driver_register(&tfp410_driver);
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}
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void __exit tilcdc_tfp410_fini(void)
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{
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platform_driver_unregister(&tfp410_driver);
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}
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