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[2001:4830:134:3::11]) by mx.google.com with ESMTPS id 74si16564414qhq.106.2015.05.13.12.17.43 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 13 May 2015 12:17:44 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Received: from localhost ([::1]:50886 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YscA3-0001oW-Dy for patch@linaro.org; Wed, 13 May 2015 15:17:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44640) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ysc5I-0002pK-NX for qemu-devel@nongnu.org; Wed, 13 May 2015 15:12:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ysc5G-0002gb-Gl for qemu-devel@nongnu.org; Wed, 13 May 2015 15:12:48 -0400 Received: from greensocs.com ([193.104.36.180]:49267) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ysc5G-0002gH-7X for qemu-devel@nongnu.org; Wed, 13 May 2015 15:12:46 -0400 Received: from localhost (localhost [127.0.0.1]) by greensocs.com (Postfix) with ESMTP id B33324EC28; Wed, 13 May 2015 21:12:45 +0200 (CEST) X-Virus-Scanned: amavisd-new at greensocs.com Received: from greensocs.com ([127.0.0.1]) by localhost (gs-01.greensocs.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3Qwh3KJke66p; Wed, 13 May 2015 21:12:44 +0200 (CEST) Received: from localhost.localdomain (i16-les03-th2-31-36-202-29.sfr.lns.abo.bbox.fr [31.36.202.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: fred.konrad@greensocs.com) by greensocs.com (Postfix) with ESMTPSA id AE41648AA; Wed, 13 May 2015 21:12:41 +0200 (CEST) From: fred.konrad@greensocs.com To: qemu-devel@nongnu.org Date: Wed, 13 May 2015 21:12:03 +0200 Message-Id: <1431544326-13372-6-git-send-email-fred.konrad@greensocs.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1431544326-13372-1-git-send-email-fred.konrad@greensocs.com> References: <1431544326-13372-1-git-send-email-fred.konrad@greensocs.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 193.104.36.180 Cc: Peter Maydell , peter.crosthwaite@xilinx.com, mark.burton@greensocs.com, hyunk@xilinx.com, fred.konrad@greensocs.com Subject: [Qemu-devel] [PATCH 5/8] hw/i2c-ddc.c: Implement DDC I2C slave X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: , List-Help: , List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org X-Original-Sender: patch@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 2a00:1450:4010:c03::235 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org; dkim=fail header.i=@greensocs.com; dmarc=fail (p=NONE dis=NONE) header.from=greensocs.com Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 From: Peter Maydell Implement an I2C slave which implements DDC and returns the EDID data for an attached monitor. Signed-off-by: Peter Maydell - Rebased on the current master. - Modified for QOM. Signed-off-by: KONRAD Frederic --- hw/i2c/Makefile.objs | 2 +- hw/i2c/i2c-ddc.c | 288 +++++++++++++++++++++++++++++++++++++++++++++++++++ hw/i2c/i2c-ddc.h | 34 ++++++ 3 files changed, 323 insertions(+), 1 deletion(-) create mode 100644 hw/i2c/i2c-ddc.c create mode 100644 hw/i2c/i2c-ddc.h diff --git a/hw/i2c/Makefile.objs b/hw/i2c/Makefile.objs index 648278e..7399b00 100644 --- a/hw/i2c/Makefile.objs +++ b/hw/i2c/Makefile.objs @@ -1,4 +1,4 @@ -common-obj-y += core.o smbus.o smbus_eeprom.o +common-obj-y += core.o smbus.o smbus_eeprom.o i2c-ddc.o common-obj-$(CONFIG_VERSATILE_I2C) += versatile_i2c.o common-obj-$(CONFIG_ACPI) += smbus_ich9.o common-obj-$(CONFIG_APM) += pm_smbus.o diff --git a/hw/i2c/i2c-ddc.c b/hw/i2c/i2c-ddc.c new file mode 100644 index 0000000..71b303c --- /dev/null +++ b/hw/i2c/i2c-ddc.c @@ -0,0 +1,288 @@ +/* A simple I2C slave for returning monitor EDID data via DDC. + * + * Copyright (c) 2011 Linaro Limited + * Written by Peter Maydell + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ +#include "hw/i2c/i2c.h" +#include "i2c-ddc.h" + +/* #define DEBUG_I2CDDC */ +#ifdef DEBUG_I2CDDC +#define DPRINTF(fmt, ...) do { printf(fmt , ## __VA_ARGS__); } while (0) +#else +#define DPRINTF(fmt, ...) do {} while (0) +#endif + +/* Structure defining a monitor's characteristics in a + * readable format: this should be passed to build_edid_blob() + * to convert it into the 128 byte binary EDID blob. + * Not all bits of the EDID are customisable here. + */ +typedef struct { + char manuf_id[3]; /* three upper case letters */ + uint16_t product_id; + uint32_t serial_no; + uint8_t manuf_week; + int manuf_year; + uint8_t h_cm; + uint8_t v_cm; + uint8_t gamma; + char monitor_name[14]; + char serial_no_string[14]; + /* Range limits */ + uint8_t vmin; /* Hz */ + uint8_t vmax; /* Hz */ + uint8_t hmin; /* kHz */ + uint8_t hmax; /* kHz */ + uint8_t pixclock; /* MHz / 10 */ + uint8_t timing_data[18]; +} edid_data; + +/* EDID data for a simple LCD monitor */ +static const edid_data lcd_edid = { + /* The manuf_id ought really to be an assigned EISA ID */ + .manuf_id = "QMU", + .product_id = 0, + .serial_no = 1, + .manuf_week = 1, + .manuf_year = 2011, + .h_cm = 40, + .v_cm = 30, + .gamma = 0x78, + .monitor_name = "QEMU monitor", + .serial_no_string = "1", + .vmin = 40, + .vmax = 120, + .hmin = 30, + .hmax = 100, + .pixclock = 18, + .timing_data = { + /* Borrowed from a 21" LCD */ + 0x48, 0x3f, 0x40, 0x30, 0x62, 0xb0, 0x32, 0x40, 0x40, + 0xc0, 0x13, 0x00, 0x98, 0x32, 0x11, 0x00, 0x00, 0x1e + } +}; + +static uint8_t manuf_char_to_int(char c) +{ + return (c - 'A') & 0x1f; +} + +static void write_ascii_descriptor_block(uint8_t *descblob, uint8_t blocktype, + const char *string) +{ + /* Write an EDID Descriptor Block of the "ascii string" type */ + int i; + descblob[0] = descblob[1] = descblob[2] = descblob[4] = 0; + descblob[3] = blocktype; + /* The rest is 13 bytes of ASCII; if less then the rest must + * be filled with newline then spaces + */ + for (i = 5; i < 19; i++) { + descblob[i] = string[i - 5]; + if (!descblob[i]) { + break; + } + } + if (i < 19) { + descblob[i++] = '\n'; + } + for ( ; i < 19; i++) { + descblob[i] = ' '; + } +} + +static void write_range_limits_descriptor(const edid_data *edid, + uint8_t *descblob) +{ + int i; + descblob[0] = descblob[1] = descblob[2] = descblob[4] = 0; + descblob[3] = 0xfd; + descblob[5] = edid->vmin; + descblob[6] = edid->vmax; + descblob[7] = edid->hmin; + descblob[8] = edid->hmax; + descblob[9] = edid->pixclock; + descblob[10] = 0; + descblob[11] = 0xa; + for (i = 12; i < 19; i++) { + descblob[i] = 0x20; + } +} + +static void build_edid_blob(const edid_data *edid, uint8_t *blob) +{ + /* Write an EDID 1.3 format blob (128 bytes) based + * on the edid_data structure. + */ + int i; + uint8_t cksum; + + /* 00-07 : header */ + blob[0] = blob[7] = 0; + for (i = 1 ; i < 7; i++) { + blob[i] = 0xff; + } + /* 08-09 : manufacturer ID */ + blob[8] = (manuf_char_to_int(edid->manuf_id[0]) << 2) + | (manuf_char_to_int(edid->manuf_id[1]) >> 3); + blob[9] = (manuf_char_to_int(edid->manuf_id[1]) << 5) + | manuf_char_to_int(edid->manuf_id[2]); + /* 10-11 : product ID code */ + blob[10] = edid->product_id; + blob[11] = edid->product_id >> 8; + blob[12] = edid->serial_no; + blob[13] = edid->serial_no >> 8; + blob[14] = edid->serial_no >> 16; + blob[15] = edid->serial_no >> 24; + /* 16 : week of manufacture */ + blob[16] = edid->manuf_week; + /* 17 : year of manufacture - 1990 */ + blob[17] = edid->manuf_year - 1990; + /* 18, 19 : EDID version and revision */ + blob[18] = 1; + blob[19] = 3; + /* 20 - 24 : basic display parameters */ + /* We are always a digital display */ + blob[20] = 0x80; + /* 21, 22 : max h/v size in cm */ + blob[21] = edid->h_cm; + blob[22] = edid->v_cm; + /* 23 : gamma (divide by 100 then add 1 for actual value) */ + blob[23] = edid->gamma; + /* 24 feature support: no power management, RGB, preferred timing mode, + * standard colour space + */ + blob[24] = 0x0e; + /* 25 - 34 : chromaticity coordinates. These are the + * standard sRGB chromaticity values + */ + blob[25] = 0xee; + blob[26] = 0x91; + blob[27] = 0xa3; + blob[28] = 0x54; + blob[29] = 0x4c; + blob[30] = 0x99; + blob[31] = 0x26; + blob[32] = 0x0f; + blob[33] = 0x50; + blob[34] = 0x54; + /* 35, 36 : Established timings: claim to support everything */ + blob[35] = blob[36] = 0xff; + /* 37 : manufacturer's reserved timing: none */ + blob[37] = 0; + /* 38 - 53 : standard timing identification + * don't claim anything beyond what the 'established timings' + * already provide. Unused slots must be (0x1, 0x1) + */ + for (i = 38; i < 54; i++) { + blob[i] = 0x1; + } + /* 54 - 71 : descriptor block 1 : must be preferred timing data */ + memcpy(blob + 54, edid->timing_data, 18); + /* 72 - 89, 90 - 107, 108 - 125 : descriptor block 2, 3, 4 + * Order not important, but we must have a monitor name and a + * range limits descriptor. + */ + write_range_limits_descriptor(edid, blob + 72); + write_ascii_descriptor_block(blob + 90, 0xfc, edid->monitor_name); + write_ascii_descriptor_block(blob + 108, 0xff, edid->serial_no_string); + + /* 126 : extension flag */ + blob[126] = 0; + + cksum = 0; + DPRINTF("EDID blob:"); + for (i = 0; i < 127; i++) { + cksum += blob[i]; + DPRINTF("%c0x%02x,", i % 8 ? ' ' : '\n', blob[i]); + } + /* 127 : checksum */ + blob[127] = -cksum; + DPRINTF(" 0x%02x\n", blob[127]); +} + +static void i2c_ddc_reset(DeviceState *ds) +{ + I2CDDCState *s = I2CDDC(ds); + s->firstbyte = 0; + s->reg = 0; +} + +static void i2c_ddc_event(I2CSlave *i2c, enum i2c_event event) +{ + I2CDDCState *s = I2CDDC(i2c); + if (event == I2C_START_SEND) { + s->firstbyte = 1; + } +} + +static int i2c_ddc_rx(I2CSlave *i2c) +{ + I2CDDCState *s = I2CDDC(i2c); + + int value; + value = s->edid_blob[s->reg]; + + s->reg++; + return value; +} + +static int i2c_ddc_tx(I2CSlave *i2c, uint8_t data) +{ + I2CDDCState *s = I2CDDC(i2c); + if (s->firstbyte) { + s->reg = data; + s->firstbyte = 0; + DPRINTF("[EDID] Written new pointer: %u\n", data); + return 1; + } + + /* Ignore all writes */ + s->reg++; + return 1; +} + +static void i2c_ddc_init(Object *obj) +{ + I2CDDCState *s = I2CDDC(obj); + build_edid_blob(&lcd_edid, s->edid_blob); +} + +static void i2c_ddc_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + I2CSlaveClass *klass = I2C_SLAVE_CLASS(oc); + + dc->reset = i2c_ddc_reset; + klass->event = i2c_ddc_event; + klass->recv = i2c_ddc_rx; + klass->send = i2c_ddc_tx; +} + +static TypeInfo i2c_ddc_info = { + .name = TYPE_I2CDDC, + .parent = TYPE_I2C_SLAVE, + .instance_size = sizeof(I2CDDCState), + .instance_init = i2c_ddc_init, + .class_init = i2c_ddc_class_init +}; + +static void ddc_register_devices(void) +{ + type_register_static(&i2c_ddc_info); +} + +type_init(ddc_register_devices); diff --git a/hw/i2c/i2c-ddc.h b/hw/i2c/i2c-ddc.h new file mode 100644 index 0000000..fdf802e --- /dev/null +++ b/hw/i2c/i2c-ddc.h @@ -0,0 +1,34 @@ +/* A simple I2C slave for returning monitor EDID data via DDC. + * + * Copyright (c) 2011 Linaro Limited + * Written by Peter Maydell + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ + +#ifndef I2C_DDC +#define I2C_DDC + +/* A simple I2C slave which just returns the contents of its EDID blob. */ + +typedef struct I2CDDCState { + I2CSlave i2c; + int firstbyte; + uint8_t reg; + uint8_t edid_blob[128]; +} I2CDDCState; + +#define TYPE_I2CDDC "i2c-ddc" +#define I2CDDC(obj) OBJECT_CHECK(I2CDDCState, (obj), TYPE_I2CDDC) + +#endif /* !I2C_DDC */