// SPDX-License-Identifier: GPL-2.0-only /* * Driver for MegaChips STDP4028 with GE B850v3 firmware (LVDS-DP) * Driver for MegaChips STDP2690 with GE B850v3 firmware (DP-DP++) * Copyright (c) 2017, Collabora Ltd. * Copyright (c) 2017, General Electric Company * This driver creates a drm_bridge and a drm_connector for the LVDS to DP++ * display bridge of the GE B850v3. There are two physical bridges on the video * signal pipeline: a STDP4028(LVDS to DP) and a STDP2690(DP to DP++). The * physical bridges are automatically configured by the input video signal, and * the driver has no access to the video processing pipeline. The driver is * only needed to read EDID from the STDP2690 and to handle HPD events from the * STDP4028. The driver communicates with both bridges over i2c. The video * signal pipeline is as follows: * * Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output */ #include <linux/i2c.h> #include <linux/module.h> #include <linux/of.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> #include <drm/drm_edid.h> #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> #define EDID_EXT_BLOCK_CNT … #define STDP4028_IRQ_OUT_CONF_REG … #define STDP4028_DPTX_IRQ_EN_REG … #define STDP4028_DPTX_IRQ_STS_REG … #define STDP4028_DPTX_STS_REG … #define STDP4028_DPTX_DP_IRQ_EN … #define STDP4028_DPTX_HOTPLUG_IRQ_EN … #define STDP4028_DPTX_LINK_CH_IRQ_EN … #define STDP4028_DPTX_IRQ_CONFIG … #define STDP4028_DPTX_HOTPLUG_STS … #define STDP4028_DPTX_LINK_STS … #define STDP4028_CON_STATE_CONNECTED … #define STDP4028_DPTX_HOTPLUG_CH_STS … #define STDP4028_DPTX_LINK_CH_STS … #define STDP4028_DPTX_IRQ_CLEAR … static DEFINE_MUTEX(ge_b850v3_lvds_dev_mutex); struct ge_b850v3_lvds { … }; static struct ge_b850v3_lvds *ge_b850v3_lvds_ptr; static int stdp2690_read_block(void *context, u8 *buf, unsigned int block, size_t len) { … } static const struct drm_edid *ge_b850v3_lvds_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) { … } static int ge_b850v3_lvds_get_modes(struct drm_connector *connector) { … } static enum drm_mode_status ge_b850v3_lvds_mode_valid( struct drm_connector *connector, struct drm_display_mode *mode) { … } static const struct drm_connector_helper_funcs ge_b850v3_lvds_connector_helper_funcs = …; static enum drm_connector_status ge_b850v3_lvds_bridge_detect(struct drm_bridge *bridge) { … } static enum drm_connector_status ge_b850v3_lvds_detect(struct drm_connector *connector, bool force) { … } static const struct drm_connector_funcs ge_b850v3_lvds_connector_funcs = …; static int ge_b850v3_lvds_create_connector(struct drm_bridge *bridge) { … } static irqreturn_t ge_b850v3_lvds_irq_handler(int irq, void *dev_id) { … } static int ge_b850v3_lvds_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) { … } static const struct drm_bridge_funcs ge_b850v3_lvds_funcs = …; static int ge_b850v3_lvds_init(struct device *dev) { … } static void ge_b850v3_lvds_remove(void) { … } static int ge_b850v3_register(void) { … } static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c) { … } static void stdp4028_ge_b850v3_fw_remove(struct i2c_client *stdp4028_i2c) { … } static const struct i2c_device_id stdp4028_ge_b850v3_fw_i2c_table[] = …; MODULE_DEVICE_TABLE(i2c, stdp4028_ge_b850v3_fw_i2c_table); static const struct of_device_id stdp4028_ge_b850v3_fw_match[] = …; MODULE_DEVICE_TABLE(of, stdp4028_ge_b850v3_fw_match); static struct i2c_driver stdp4028_ge_b850v3_fw_driver = …; static int stdp2690_ge_b850v3_fw_probe(struct i2c_client *stdp2690_i2c) { … } static void stdp2690_ge_b850v3_fw_remove(struct i2c_client *stdp2690_i2c) { … } static const struct i2c_device_id stdp2690_ge_b850v3_fw_i2c_table[] = …; MODULE_DEVICE_TABLE(i2c, stdp2690_ge_b850v3_fw_i2c_table); static const struct of_device_id stdp2690_ge_b850v3_fw_match[] = …; MODULE_DEVICE_TABLE(of, stdp2690_ge_b850v3_fw_match); static struct i2c_driver stdp2690_ge_b850v3_fw_driver = …; static int __init stdpxxxx_ge_b850v3_init(void) { … } module_init(…) …; static void __exit stdpxxxx_ge_b850v3_exit(void) { … } module_exit(stdpxxxx_ge_b850v3_exit); MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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