376 lines
8.2 KiB
C
376 lines
8.2 KiB
C
/*
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* Copyright (C) 2016 Texas Instruments
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* Author: Jyri Sarha <jsarha@ti.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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*/
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#include <linux/delay.h>
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#include <linux/fwnode.h>
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#include <linux/gpio/consumer.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <drm/drmP.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_crtc_helper.h>
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#define HOTPLUG_DEBOUNCE_MS 1100
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struct tfp410 {
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struct drm_bridge bridge;
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struct drm_connector connector;
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struct i2c_adapter *ddc;
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struct gpio_desc *hpd;
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struct delayed_work hpd_work;
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struct device *dev;
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};
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static inline struct tfp410 *
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drm_bridge_to_tfp410(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct tfp410, bridge);
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}
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static inline struct tfp410 *
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drm_connector_to_tfp410(struct drm_connector *connector)
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{
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return container_of(connector, struct tfp410, connector);
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}
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static int tfp410_get_modes(struct drm_connector *connector)
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{
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struct tfp410 *dvi = drm_connector_to_tfp410(connector);
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struct edid *edid;
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int ret;
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if (!dvi->ddc)
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goto fallback;
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edid = drm_get_edid(connector, dvi->ddc);
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if (!edid) {
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DRM_INFO("EDID read failed. Fallback to standard modes\n");
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goto fallback;
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}
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drm_connector_update_edid_property(connector, edid);
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return drm_add_edid_modes(connector, edid);
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fallback:
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/* No EDID, fallback on the XGA standard modes */
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ret = drm_add_modes_noedid(connector, 1920, 1200);
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/* And prefer a mode pretty much anything can handle */
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drm_set_preferred_mode(connector, 1024, 768);
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return ret;
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}
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static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
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.get_modes = tfp410_get_modes,
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};
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static enum drm_connector_status
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tfp410_connector_detect(struct drm_connector *connector, bool force)
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{
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struct tfp410 *dvi = drm_connector_to_tfp410(connector);
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if (dvi->hpd) {
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if (gpiod_get_value_cansleep(dvi->hpd))
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return connector_status_connected;
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else
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return connector_status_disconnected;
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}
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if (dvi->ddc) {
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if (drm_probe_ddc(dvi->ddc))
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return connector_status_connected;
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else
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return connector_status_disconnected;
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}
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return connector_status_unknown;
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}
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static const struct drm_connector_funcs tfp410_con_funcs = {
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.detect = tfp410_connector_detect,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = drm_connector_cleanup,
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.reset = drm_atomic_helper_connector_reset,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static int tfp410_attach(struct drm_bridge *bridge)
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{
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struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
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int ret;
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if (!bridge->encoder) {
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dev_err(dvi->dev, "Missing encoder\n");
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return -ENODEV;
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}
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if (dvi->hpd)
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dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
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drm_connector_helper_add(&dvi->connector,
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&tfp410_con_helper_funcs);
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ret = drm_connector_init(bridge->dev, &dvi->connector,
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&tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA);
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if (ret) {
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dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
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return ret;
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}
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drm_connector_attach_encoder(&dvi->connector,
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bridge->encoder);
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return 0;
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}
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static const struct drm_bridge_funcs tfp410_bridge_funcs = {
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.attach = tfp410_attach,
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};
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static void tfp410_hpd_work_func(struct work_struct *work)
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{
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struct tfp410 *dvi;
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dvi = container_of(work, struct tfp410, hpd_work.work);
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if (dvi->bridge.dev)
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drm_helper_hpd_irq_event(dvi->bridge.dev);
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}
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static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
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{
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struct tfp410 *dvi = arg;
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mod_delayed_work(system_wq, &dvi->hpd_work,
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msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
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return IRQ_HANDLED;
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}
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static int tfp410_get_connector_properties(struct tfp410 *dvi)
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{
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struct device_node *connector_node, *ddc_phandle;
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int ret = 0;
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/* port@1 is the connector node */
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connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
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if (!connector_node)
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return -ENODEV;
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dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode,
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"hpd-gpios", 0, GPIOD_IN, "hpd");
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if (IS_ERR(dvi->hpd)) {
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ret = PTR_ERR(dvi->hpd);
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dvi->hpd = NULL;
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if (ret == -ENOENT)
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ret = 0;
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else
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goto fail;
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}
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ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
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if (!ddc_phandle)
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goto fail;
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dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
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if (dvi->ddc)
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dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
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else
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ret = -EPROBE_DEFER;
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of_node_put(ddc_phandle);
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fail:
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of_node_put(connector_node);
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return ret;
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}
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static int tfp410_init(struct device *dev)
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{
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struct tfp410 *dvi;
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int ret;
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if (!dev->of_node) {
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dev_err(dev, "device-tree data is missing\n");
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return -ENXIO;
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}
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dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
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if (!dvi)
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return -ENOMEM;
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dev_set_drvdata(dev, dvi);
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dvi->bridge.funcs = &tfp410_bridge_funcs;
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dvi->bridge.of_node = dev->of_node;
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dvi->dev = dev;
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ret = tfp410_get_connector_properties(dvi);
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if (ret)
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goto fail;
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if (dvi->hpd) {
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INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
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ret = devm_request_threaded_irq(dev, gpiod_to_irq(dvi->hpd),
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NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"hdmi-hpd", dvi);
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if (ret) {
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DRM_ERROR("failed to register hpd interrupt\n");
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goto fail;
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}
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}
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drm_bridge_add(&dvi->bridge);
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return 0;
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fail:
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i2c_put_adapter(dvi->ddc);
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if (dvi->hpd)
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gpiod_put(dvi->hpd);
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return ret;
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}
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static int tfp410_fini(struct device *dev)
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{
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struct tfp410 *dvi = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&dvi->hpd_work);
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drm_bridge_remove(&dvi->bridge);
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if (dvi->ddc)
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i2c_put_adapter(dvi->ddc);
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if (dvi->hpd)
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gpiod_put(dvi->hpd);
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return 0;
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}
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static int tfp410_probe(struct platform_device *pdev)
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{
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return tfp410_init(&pdev->dev);
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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 tfp410_fini(&pdev->dev);
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}
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static const struct of_device_id tfp410_match[] = {
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{ .compatible = "ti,tfp410" },
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{},
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};
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MODULE_DEVICE_TABLE(of, tfp410_match);
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static struct platform_driver tfp410_platform_driver = {
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.probe = tfp410_probe,
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.remove = tfp410_remove,
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.driver = {
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.name = "tfp410-bridge",
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.of_match_table = tfp410_match,
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},
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};
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#if IS_ENABLED(CONFIG_I2C)
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/* There is currently no i2c functionality. */
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static int tfp410_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int reg;
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if (!client->dev.of_node ||
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of_property_read_u32(client->dev.of_node, "reg", ®)) {
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dev_err(&client->dev,
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"Can't get i2c reg property from device-tree\n");
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return -ENXIO;
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}
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return tfp410_init(&client->dev);
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}
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static int tfp410_i2c_remove(struct i2c_client *client)
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{
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return tfp410_fini(&client->dev);
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}
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static const struct i2c_device_id tfp410_i2c_ids[] = {
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{ "tfp410", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
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static struct i2c_driver tfp410_i2c_driver = {
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.driver = {
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.name = "tfp410",
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.of_match_table = of_match_ptr(tfp410_match),
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},
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.id_table = tfp410_i2c_ids,
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.probe = tfp410_i2c_probe,
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.remove = tfp410_i2c_remove,
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};
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#endif /* IS_ENABLED(CONFIG_I2C) */
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static struct {
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uint i2c:1;
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uint platform:1;
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} tfp410_registered_driver;
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static int __init tfp410_module_init(void)
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{
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int ret;
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#if IS_ENABLED(CONFIG_I2C)
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ret = i2c_add_driver(&tfp410_i2c_driver);
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if (ret)
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pr_err("%s: registering i2c driver failed: %d",
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__func__, ret);
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else
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tfp410_registered_driver.i2c = 1;
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#endif
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ret = platform_driver_register(&tfp410_platform_driver);
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if (ret)
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pr_err("%s: registering platform driver failed: %d",
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__func__, ret);
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else
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tfp410_registered_driver.platform = 1;
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if (tfp410_registered_driver.i2c ||
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tfp410_registered_driver.platform)
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return 0;
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return ret;
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}
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module_init(tfp410_module_init);
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static void __exit tfp410_module_exit(void)
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{
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#if IS_ENABLED(CONFIG_I2C)
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if (tfp410_registered_driver.i2c)
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i2c_del_driver(&tfp410_i2c_driver);
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#endif
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if (tfp410_registered_driver.platform)
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platform_driver_unregister(&tfp410_platform_driver);
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}
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module_exit(tfp410_module_exit);
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MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
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MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
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MODULE_LICENSE("GPL");
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