/* * Generic DVI Connector driver * * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ * Author: Tomi Valkeinen * * 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. */ #include #include #include #include #include #include #include "../dss/omapdss.h" struct panel_drv_data { struct omap_dss_device dssdev; struct i2c_adapter *i2c_adapter; struct gpio_desc *hpd_gpio; void (*hpd_cb)(void *cb_data, enum drm_connector_status status); void *hpd_cb_data; bool hpd_enabled; /* mutex for hpd fields above */ struct mutex hpd_lock; }; #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) static int dvic_connect(struct omap_dss_device *src, struct omap_dss_device *dst) { return 0; } static void dvic_disconnect(struct omap_dss_device *src, struct omap_dss_device *dst) { } static int dvic_ddc_read(struct i2c_adapter *adapter, unsigned char *buf, u16 count, u8 offset) { int r, retries; for (retries = 3; retries > 0; retries--) { struct i2c_msg msgs[] = { { .addr = DDC_ADDR, .flags = 0, .len = 1, .buf = &offset, }, { .addr = DDC_ADDR, .flags = I2C_M_RD, .len = count, .buf = buf, } }; r = i2c_transfer(adapter, msgs, 2); if (r == 2) return 0; if (r != -EAGAIN) break; } return r < 0 ? r : -EIO; } static int dvic_read_edid(struct omap_dss_device *dssdev, u8 *edid, int len) { struct panel_drv_data *ddata = to_panel_data(dssdev); int r, l, bytes_read; l = min(EDID_LENGTH, len); r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0); if (r) return r; bytes_read = l; /* if there are extensions, read second block */ if (len > EDID_LENGTH && edid[0x7e] > 0) { l = min(EDID_LENGTH, len - EDID_LENGTH); r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH, l, EDID_LENGTH); if (r) return r; bytes_read += l; } return bytes_read; } static bool dvic_detect(struct omap_dss_device *dssdev) { struct panel_drv_data *ddata = to_panel_data(dssdev); unsigned char out; int r; if (ddata->hpd_gpio) return gpiod_get_value_cansleep(ddata->hpd_gpio); if (!ddata->i2c_adapter) return true; r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0); return r == 0; } static void dvic_register_hpd_cb(struct omap_dss_device *dssdev, void (*cb)(void *cb_data, enum drm_connector_status status), void *cb_data) { struct panel_drv_data *ddata = to_panel_data(dssdev); mutex_lock(&ddata->hpd_lock); ddata->hpd_cb = cb; ddata->hpd_cb_data = cb_data; mutex_unlock(&ddata->hpd_lock); } static void dvic_unregister_hpd_cb(struct omap_dss_device *dssdev) { struct panel_drv_data *ddata = to_panel_data(dssdev); mutex_lock(&ddata->hpd_lock); ddata->hpd_cb = NULL; ddata->hpd_cb_data = NULL; mutex_unlock(&ddata->hpd_lock); } static const struct omap_dss_device_ops dvic_ops = { .connect = dvic_connect, .disconnect = dvic_disconnect, .read_edid = dvic_read_edid, .detect = dvic_detect, .register_hpd_cb = dvic_register_hpd_cb, .unregister_hpd_cb = dvic_unregister_hpd_cb, }; static irqreturn_t dvic_hpd_isr(int irq, void *data) { struct panel_drv_data *ddata = data; mutex_lock(&ddata->hpd_lock); if (ddata->hpd_enabled && ddata->hpd_cb) { enum drm_connector_status status; if (dvic_detect(&ddata->dssdev)) status = connector_status_connected; else status = connector_status_disconnected; ddata->hpd_cb(ddata->hpd_cb_data, status); } mutex_unlock(&ddata->hpd_lock); return IRQ_HANDLED; } static int dvic_probe_of(struct platform_device *pdev) { struct panel_drv_data *ddata = platform_get_drvdata(pdev); struct device_node *node = pdev->dev.of_node; struct device_node *adapter_node; struct i2c_adapter *adapter; struct gpio_desc *gpio; int r; gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN); if (IS_ERR(gpio)) { dev_err(&pdev->dev, "failed to parse HPD gpio\n"); return PTR_ERR(gpio); } ddata->hpd_gpio = gpio; mutex_init(&ddata->hpd_lock); if (ddata->hpd_gpio) { r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio), NULL, dvic_hpd_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "DVI HPD", ddata); if (r) return r; } adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0); if (adapter_node) { adapter = of_get_i2c_adapter_by_node(adapter_node); of_node_put(adapter_node); if (adapter == NULL) { dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n"); return -EPROBE_DEFER; } ddata->i2c_adapter = adapter; } return 0; } static int dvic_probe(struct platform_device *pdev) { struct panel_drv_data *ddata; struct omap_dss_device *dssdev; int r; ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); if (!ddata) return -ENOMEM; platform_set_drvdata(pdev, ddata); r = dvic_probe_of(pdev); if (r) return r; dssdev = &ddata->dssdev; dssdev->ops = &dvic_ops; dssdev->dev = &pdev->dev; dssdev->type = OMAP_DISPLAY_TYPE_DVI; dssdev->owner = THIS_MODULE; dssdev->of_ports = BIT(0); if (ddata->hpd_gpio) dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT | OMAP_DSS_DEVICE_OP_HPD; if (ddata->i2c_adapter) dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT | OMAP_DSS_DEVICE_OP_EDID; omapdss_display_init(dssdev); omapdss_device_register(dssdev); return 0; } static int __exit dvic_remove(struct platform_device *pdev) { struct panel_drv_data *ddata = platform_get_drvdata(pdev); omapdss_device_unregister(&ddata->dssdev); i2c_put_adapter(ddata->i2c_adapter); mutex_destroy(&ddata->hpd_lock); return 0; } static const struct of_device_id dvic_of_match[] = { { .compatible = "omapdss,dvi-connector", }, {}, }; MODULE_DEVICE_TABLE(of, dvic_of_match); static struct platform_driver dvi_connector_driver = { .probe = dvic_probe, .remove = __exit_p(dvic_remove), .driver = { .name = "connector-dvi", .of_match_table = dvic_of_match, .suppress_bind_attrs = true, }, }; module_platform_driver(dvi_connector_driver); MODULE_AUTHOR("Tomi Valkeinen "); MODULE_DESCRIPTION("Generic DVI Connector driver"); MODULE_LICENSE("GPL");