From patchwork Mon Nov 19 16:39:07 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pawel Moll X-Patchwork-Id: 1765981 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 423A6DFF71 for ; Mon, 19 Nov 2012 16:39:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753867Ab2KSQj2 (ORCPT ); Mon, 19 Nov 2012 11:39:28 -0500 Received: from service87.mimecast.com ([91.220.42.44]:42587 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753756Ab2KSQj1 (ORCPT ); Mon, 19 Nov 2012 11:39:27 -0500 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Mon, 19 Nov 2012 16:39:25 +0000 Received: from hornet.Cambridge.Arm.com ([10.1.255.212]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 19 Nov 2012 16:39:24 +0000 From: Pawel Moll To: Arnd Bergmann , Florian Tobias Schandinat Cc: linux-fbdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Pawel Moll Subject: [PATCH v4] video: Versatile Express DVI output driver Date: Mon, 19 Nov 2012 16:39:07 +0000 Message-Id: <1353343147-15654-1-git-send-email-pawel.moll@arm.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1353342376.3303.32.camel@hornet> References: <1353342376.3303.32.camel@hornet> X-OriginalArrivalTime: 19 Nov 2012 16:39:24.0973 (UTC) FILETIME=[6F517DD0:01CDC674] X-MC-Unique: 112111916392508501 Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Versatile Express' DVI video output can be connected to one the three sources - motherboard's CLCD controller or a video signal generated by one of the daughterboards. This driver configures the muxer FPGA so the output displays content of one of the framebuffers in the system (0 by default, can be changed by user writing to the "fb" sysfs attribute of the muxfpga device). It will also set up the display formatter mode and keep it up to date with mode changes requested by the user (eg. with fbset tool). Signed-off-by: Pawel Moll --- .../ABI/testing/sysfs-driver-video-vexpress-dvi.c | 5 + drivers/video/Makefile | 3 + drivers/video/vexpress-dvi.c | 223 ++++++++++++++++++++ 3 files changed, 231 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-video-vexpress-dvi.c create mode 100644 drivers/video/vexpress-dvi.c diff --git a/Documentation/ABI/testing/sysfs-driver-video-vexpress-dvi.c b/Documentation/ABI/testing/sysfs-driver-video-vexpress-dvi.c new file mode 100644 index 0000000..4835e09 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-video-vexpress-dvi.c @@ -0,0 +1,5 @@ +What: /sys/bus/platform/drivers/vexpress-dvi//fb +Date: November 2012 +Contant: Pawel Moll +Description: This file stores the number of the framebuffer which is + supposed to be routed to the board's DVI output. diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 23e948e..2f4440d 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -167,3 +167,6 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o #video output switch sysfs driver obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o + +# platform specific output drivers +obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-dvi.o diff --git a/drivers/video/vexpress-dvi.c b/drivers/video/vexpress-dvi.c new file mode 100644 index 0000000..d5a4847 --- /dev/null +++ b/drivers/video/vexpress-dvi.c @@ -0,0 +1,223 @@ +/* + * 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. + * + * Copyright (C) 2012 ARM Limited + */ + +#define pr_fmt(fmt) "vexpress-dvi: " fmt + +#include +#include +#include +#include + + +static struct vexpress_config_func *vexpress_dvimode_func; + +static struct { + u32 xres, yres, mode; +} vexpress_dvi_dvimodes[] = { + { 640, 480, 0 }, /* VGA */ + { 800, 600, 1 }, /* SVGA */ + { 1024, 768, 2 }, /* XGA */ + { 1280, 1024, 3 }, /* SXGA */ + { 1600, 1200, 4 }, /* UXGA */ + { 1920, 1080, 5 }, /* HD1080 */ +}; + +static void vexpress_dvi_mode_set(struct fb_info *info, u32 xres, u32 yres) +{ + int err = -ENOENT; + int i; + + if (!vexpress_dvimode_func) + return; + + for (i = 0; i < ARRAY_SIZE(vexpress_dvi_dvimodes); i++) { + if (vexpress_dvi_dvimodes[i].xres == xres && + vexpress_dvi_dvimodes[i].yres == yres) { + pr_debug("mode: %ux%u = %d\n", xres, yres, + vexpress_dvi_dvimodes[i].mode); + err = vexpress_config_write(vexpress_dvimode_func, 0, + vexpress_dvi_dvimodes[i].mode); + break; + } + } + + if (err) + pr_warn("Failed to set %ux%u mode! (%d)\n", xres, yres, err); +} + + +static struct vexpress_config_func *vexpress_muxfpga_func; +static int vexpress_dvi_fb = -1; + +static int vexpress_dvi_mux_set(struct fb_info *info) +{ + int err; + u32 site = vexpress_get_site_by_dev(info->device); + + if (!vexpress_muxfpga_func) + return -ENXIO; + + err = vexpress_config_write(vexpress_muxfpga_func, 0, site); + if (!err) { + pr_debug("Selected MUXFPGA input %d (fb%d)\n", site, + info->node); + vexpress_dvi_fb = info->node; + vexpress_dvi_mode_set(info, info->var.xres, + info->var.yres); + } else { + pr_warn("Failed to select MUXFPGA input %d (fb%d)! (%d)\n", + site, info->node, err); + } + + return err; +} + +static int vexpress_dvi_fb_select(int fb) +{ + int err; + struct fb_info *info; + + /* fb0 is the default */ + if (fb < 0) + fb = 0; + + if (fb >= FB_MAX) + return -EINVAL; + + info = registered_fb[fb]; + if (!info || !lock_fb_info(info)) + return -ENODEV; + + err = vexpress_dvi_mux_set(info); + + unlock_fb_info(info); + + return err; +} + +static ssize_t vexpress_dvi_fb_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", vexpress_dvi_fb); +} + +static ssize_t vexpress_dvi_fb_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + long value; + int err = kstrtol(buf, 0, &value); + + if (!err) + err = vexpress_dvi_fb_select(value); + + return err ? err : count; +} + +DEVICE_ATTR(fb, S_IRUGO | S_IWUSR, vexpress_dvi_fb_show, + vexpress_dvi_fb_store); + + +static int vexpress_dvi_fb_event_notify(struct notifier_block *self, + unsigned long action, void *data) +{ + struct fb_event *event = data; + struct fb_info *info = event->info; + struct fb_videomode *mode = event->data; + + switch (action) { + case FB_EVENT_FB_REGISTERED: + if (vexpress_dvi_fb < 0) + vexpress_dvi_mux_set(info); + break; + case FB_EVENT_MODE_CHANGE: + case FB_EVENT_MODE_CHANGE_ALL: + if (info->node == vexpress_dvi_fb) + vexpress_dvi_mode_set(info, mode->xres, mode->yres); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block vexpress_dvi_fb_notifier = { + .notifier_call = vexpress_dvi_fb_event_notify, +}; +static bool vexpress_dvi_fb_notifier_registered; + + +enum vexpress_dvi_func { FUNC_MUXFPGA, FUNC_DVIMODE }; + +static struct of_device_id vexpress_dvi_of_match[] = { + { + .compatible = "arm,vexpress-muxfpga", + .data = (void *)FUNC_MUXFPGA, + }, { + .compatible = "arm,vexpress-dvimode", + .data = (void *)FUNC_DVIMODE, + }, + {} +}; + +static int vexpress_dvi_probe(struct platform_device *pdev) +{ + enum vexpress_dvi_func func; + const struct of_device_id *match = + of_match_device(vexpress_dvi_of_match, &pdev->dev); + + if (match) + func = (enum vexpress_dvi_func)match->data; + else + func = pdev->id_entry->driver_data; + + switch (func) { + case FUNC_MUXFPGA: + vexpress_muxfpga_func = + vexpress_config_func_get_by_dev(&pdev->dev); + device_create_file(&pdev->dev, &dev_attr_fb); + break; + case FUNC_DVIMODE: + vexpress_dvimode_func = + vexpress_config_func_get_by_dev(&pdev->dev); + break; + } + + if (!vexpress_dvi_fb_notifier_registered) { + fb_register_client(&vexpress_dvi_fb_notifier); + vexpress_dvi_fb_notifier_registered = true; + } + + vexpress_dvi_fb_select(vexpress_dvi_fb); + + return 0; +} + +static const struct platform_device_id vexpress_dvi_id_table[] = { + { .name = "vexpress-muxfpga", .driver_data = FUNC_MUXFPGA, }, + { .name = "vexpress-dvimode", .driver_data = FUNC_DVIMODE, }, + {} +}; + +static struct platform_driver vexpress_dvi_driver = { + .probe = vexpress_dvi_probe, + .driver = { + .name = "vexpress-dvi", + .of_match_table = vexpress_dvi_of_match, + }, + .id_table = vexpress_dvi_id_table, +}; + +static int __init vexpress_dvi_init(void) +{ + return platform_driver_register(&vexpress_dvi_driver); +} +device_initcall(vexpress_dvi_init);