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[Qemu-devel] [PATCH v5] i2c-tiny-usb is a small usb to i2c bridge
|
From: |
Tim Sander |
|
Subject: |
[Qemu-devel] [PATCH v5] i2c-tiny-usb is a small usb to i2c bridge |
|
Date: |
Fri, 22 Jan 2016 16:17:08 +0100 |
|
User-agent: |
KMail/4.14.3 (Linux/4.4.0-00001-g95803be; KDE/4.14.13; x86_64; ; ) |
i2c-tiny-usb is a small usb to i2c bridge:
http://www.harbaum.org/till/i2c_tiny_usb/index.shtml
It is pretty simple and has no usb endpoints just a control.
Reasons for adding this device:
* Linux device driver available
* adding an additional i2c bus via command line e.g.
-device usb-i2c-tiny,id=i2c-0 -device tmp105,bus=i2c,address=0x50
---
Signed-off-by: Tim Sander <address@hidden>
default-configs/usb.mak | 1 +
hw/usb/Makefile.objs | 1 +
hw/usb/dev-i2c-tiny.c | 314 ++++++++++++++++++++++++++++++++++++++++++++++++
trace-events | 11 ++
4 files changed, 327 insertions(+)
create mode 100644 hw/usb/dev-i2c-tiny.c
diff --git a/default-configs/usb.mak b/default-configs/usb.mak
index f4b8568..01d2c9f 100644
--- a/default-configs/usb.mak
+++ b/default-configs/usb.mak
@@ -8,3 +8,4 @@ CONFIG_USB_AUDIO=y
CONFIG_USB_SERIAL=y
CONFIG_USB_NETWORK=y
CONFIG_USB_BLUETOOTH=y
+CONFIG_USB_I2C_TINY=y
diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
index 8f00fbd..3a4c337 100644
--- a/hw/usb/Makefile.objs
+++ b/hw/usb/Makefile.objs
@@ -20,6 +20,7 @@ common-obj-$(CONFIG_USB_AUDIO) += dev-audio.o
common-obj-$(CONFIG_USB_SERIAL) += dev-serial.o
common-obj-$(CONFIG_USB_NETWORK) += dev-network.o
common-obj-$(CONFIG_USB_BLUETOOTH) += dev-bluetooth.o
+common-obj-$(CONFIG_USB_I2C_TINY) += dev-i2c-tiny.o
ifeq ($(CONFIG_USB_SMARTCARD),y)
common-obj-y += dev-smartcard-reader.o
diff --git a/hw/usb/dev-i2c-tiny.c b/hw/usb/dev-i2c-tiny.c
new file mode 100644
index 0000000..7abb9df
--- /dev/null
+++ b/hw/usb/dev-i2c-tiny.c
@@ -0,0 +1,314 @@
+/*
+ * I2C tiny usb device emulation
+ *
+ * i2c-tiny-usb is a small usb to i2c bridge:
+ *
+ * http://www.harbaum.org/till/i2c_tiny_usb/index.shtml
+ *
+ * The simulated device is pretty simple and has no usb endpoints.
+ * There is a Linux device driver available named i2c-tiny-usb.
+ *
+ * Below is an example how to use this device from command line:
+ * -device usb-i2c-tiny,id=i2c-0 -device tmp105,bus=i2c,address=0x50
+ *
+ * Copyright (c) 2015 Tim Sander <address@hidden>
+ *
+ * Loosly based on usb dev-serial.c:
+ * Copyright (c) 2006 CodeSourcery.
+ * Copyright (c) 2008 Samuel Thibault <address@hidden>
+ * Written by Paul Brook, reused for FTDI by Samuel Thibault
+ *
+ * This code is licensed under the LGPL.
+ *
+ */
+
+#include "trace.h"
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "hw/usb.h"
+#include "hw/usb/desc.h"
+#include "hw/i2c/i2c.h"
+#include "hw/i2c/smbus.h"
+#include "sysemu/char.h"
+#include "endian.h"
+
+/* commands from USB, must e.g. match command ids in kernel driver */
+#define CMD_ECHO 0
+#define CMD_GET_FUNC 1
+#define CMD_SET_DELAY 2
+#define CMD_GET_STATUS 3
+
+/* To determine what functionality is present */
+#define I2C_FUNC_I2C 0x00000001
+#define I2C_FUNC_10BIT_ADDR 0x00000002
+#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004
+#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_QUICK 0x00010000
+#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
+#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
+#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
+#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
+#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
+#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
+#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
+#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
+#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
+#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /*I2C-like blk-xfr
*/
+#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /*1-byte reg.
addr.*/
+#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /*I2C-like
blk-xfer*/
+#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte
regadr*/
+#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */
+#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
+
+#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
+ I2C_FUNC_SMBUS_WRITE_BYTE)
+#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
+#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
+ I2C_FUNC_SMBUS_WRITE_WORD_DATA)
+#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
+ I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
+#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
+ I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
+
+#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
+ I2C_FUNC_SMBUS_BYTE | \
+ I2C_FUNC_SMBUS_BYTE_DATA | \
+ I2C_FUNC_SMBUS_WORD_DATA | \
+ I2C_FUNC_SMBUS_PROC_CALL | \
+ I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
+ I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \
+ I2C_FUNC_SMBUS_I2C_BLOCK)
+
+#define DeviceOutVendor ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+#define DeviceInVendor ((USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+
+typedef struct {
+ USBDevice dev;
+ I2CBus *i2cbus;
+} USBI2CTinyState;
+
+#define TYPE_USB_I2C_TINY "usb-i2c"
+#define USB_I2C_TINY_DEV(obj) OBJECT_CHECK(USBI2CTinyState, \
+ (obj), TYPE_USB_I2C_TINY)
+
+enum {
+ STR_MANUFACTURER = 1,
+ STR_PRODUCT_SERIAL,
+ STR_SERIALNUMBER,
+};
+
+static const USBDescStrings desc_strings = {
+ [STR_MANUFACTURER] = "QEMU",
+ [STR_PRODUCT_SERIAL] = "QEMU USB I2C Tiny",
+ [STR_SERIALNUMBER] = "1",
+};
+
+static const USBDescIface desc_iface0 = {
+ .bInterfaceNumber = 1,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = 0xff,
+ .bInterfaceSubClass = 0xff,
+ .bInterfaceProtocol = 0xff,
+ .eps = (USBDescEndpoint[]) {
+ }
+};
+
+static const USBDescDevice desc_device = {
+ .bcdUSB = 0x0110,
+ .bMaxPacketSize0 = 8,
+ .bNumConfigurations = 1,
+ .confs = (const USBDescConfig[]) {
+ {
+ .bNumInterfaces = 1,
+ .bConfigurationValue = 1,
+ .bmAttributes = USB_CFG_ATT_ONE,
+ .bMaxPower = 50,
+ .nif = 1,
+ .ifs = &desc_iface0,
+ },
+ },
+};
+
+static const USBDesc desc_usb_i2c = {
+ .id = {
+ .idVendor = 0x0403,
+ .idProduct = 0xc631,
+ .bcdDevice = 0x0205,
+ .iManufacturer = STR_MANUFACTURER,
+ .iProduct = STR_PRODUCT_SERIAL,
+ .iSerialNumber = STR_SERIALNUMBER,
+ },
+ .full = &desc_device,
+ .str = desc_strings,
+};
+
+static void usb_i2c_handle_reset(USBDevice *dev)
+{
+ trace_usb_i2c_tiny_reset();
+}
+
+static void usb_i2c_handle_control(USBDevice *dev, USBPacket *p,
+ int request, int value, int index, int length, uint8_t *data)
+{
+ USBI2CTinyState *s = (USBI2CTinyState *)dev;
+ int ret,i, i2c_value;
+ uint32_t func;
+
+ ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
+ if (ret >= 0) {
+ return;
+ }
+
+ switch (request) {
+ case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
+ break;
+ case 0x4102:
+ /* set clock, ignore */
+ trace_usb_i2c_tiny_set_clock();
+ break;
+
+ case 0x4105:
+ trace_usb_i2c_tiny_unknown_request(index, request, value, length);
+ break;
+
+ case 0x4107:
+ /* this seems to be a byte type access */
+ if (i2c_start_transfer(s->i2cbus, /*address*/index, 0)) {
+ trace_usb_i2c_tiny_i2c_start_transfer_failed();
+ p->actual_length = 0; /* write failure */
+ break;
+ }
+ for (i = 0; i < length; i++) {
+ trace_usb_i2c_tiny_write(request, index, i, data[i]);
+ i2c_send(s->i2cbus, data[i]);
+ }
+ p->actual_length = length;
+ i2c_end_transfer(s->i2cbus);
+ break;
+
+ case 0xc101:
+ /* thats what the real thing reports, FIXME: can we do better here? */
+ func = htole32(I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL);
+ memcpy(data, &func, sizeof(func));
+ p->actual_length = sizeof(func);
+ trace_usb_i2c_tiny_functionality_read(length);
+ break;
+
+ case 0xc103:
+ trace_usb_i2c_tiny_unknown_request(index, request, value, length);
+ p->actual_length = 1;
+ break;
+
+ case 0xc106:
+ case 0xc107:
+ if (i2c_start_transfer(s->i2cbus, /*address*/ index, 1)) {
+ trace_usb_i2c_tiny_i2c_start_transfer_failed();
+ p->actual_length = 0;
+ break;
+ }
+ if(request&1) {
+ i2c_send(s->i2cbus, data[0]);
+ i2c_start_transfer(s->i2cbus, /*address*/ index, 1);
+ }
+ for (i = 0; i < length; i++) {
+ i2c_value = i2c_recv(s->i2cbus);
+ if (i2c_value < 0) {
+ break;
+ }
+ data[i] = i2c_value;
+ trace_usb_i2c_tiny_read(request, index, i, data[i]);
+ }
+ if(request&1) {
+ i2c_nack(s->i2cbus);
+ }
+ p->actual_length = length;
+ i2c_end_transfer(s->i2cbus);
+ break;
+
+ default:
+ p->status = USB_RET_STALL;
+ trace_usb_i2c_tiny_unknown_request(index, request, value, length);
+ break;
+ }
+}
+
+static void usb_i2c_handle_data(USBDevice *dev, USBPacket *p)
+{
+ trace_usb_i2c_tiny_usb_i2c_handle_data();
+}
+
+static void usb_i2c_realize(USBDevice *dev, Error **errp)
+{
+ USBI2CTinyState *s = (USBI2CTinyState *)dev;
+ Error *local_err = NULL;
+
+ usb_desc_create_serial(dev);
+ usb_desc_init(dev);
+
+ usb_check_attach(dev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ s->i2cbus = i2c_init_bus(&dev->qdev, "i2c");
+ usb_i2c_handle_reset(dev);
+}
+
+static const VMStateDescription vmstate_usb_i2c = {
+ .name = "usb-i2c-tiny",
+};
+
+static Property usbi2c_properties[] = {
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void usb_i2c_dev_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
+
+ uc->realize = usb_i2c_realize;
+ uc->handle_reset = usb_i2c_handle_reset;
+ uc->handle_control = usb_i2c_handle_control;
+ uc->handle_data = usb_i2c_handle_data;
+ dc->vmsd = &vmstate_usb_i2c;
+ set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
+}
+
+static const TypeInfo usb_i2c_dev_type_info = {
+ .name = TYPE_USB_I2C_TINY,
+ .parent = TYPE_USB_DEVICE,
+ .instance_size = sizeof(USBI2CTinyState),
+ .abstract = true,
+ .class_init = usb_i2c_dev_class_init,
+};
+
+static void usb_i2c_class_initfn(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
+
+ uc->product_desc = "QEMU USB I2C Tiny";
+ uc->usb_desc = &desc_usb_i2c;
+ dc->props = usbi2c_properties;
+}
+
+static const TypeInfo usbi2c_info = {
+ .name = "usb-i2c-tiny",
+ .parent = TYPE_USB_I2C_TINY,
+ .class_init = usb_i2c_class_initfn,
+};
+
+static void usb_i2c_register_types(void)
+{
+ type_register_static(&usb_i2c_dev_type_info);
+ type_register_static(&usbi2c_info);
+}
+
+type_init(usb_i2c_register_types)
diff --git a/trace-events b/trace-events
index c9ac144..54f977d 100644
--- a/trace-events
+++ b/trace-events
@@ -328,6 +328,17 @@ usb_port_attach(int bus, const char *port, const char
*devspeed, const char *por
usb_port_detach(int bus, const char *port) "bus %d, port %s"
usb_port_release(int bus, const char *port) "bus %d, port %s"
+# hw/usb/dev-tiny-i2c.c
+usb_i2c_tiny_read(int request, int address,int offset,int data) "request:0x%x
address:%i offset:%i data:%i"
+usb_i2c_tiny_write(int request, int address,int offset,int data) "request:0x%x
address:%i offset:%i data:%i"
+usb_i2c_tiny_functionality_read(int length) "length:%i"
+usb_i2c_tiny_reset(void) ""
+usb_i2c_tiny_set_clock(void) ""
+usb_i2c_tiny_usb_i2c_handle_data(void) ""
+usb_i2c_tiny_i2c_start_transfer_failed(void) "i2c start transfer failed"
+usb_i2c_tiny_ignored_request(int index,int request,int value,int length)
"index:%i request:0x%x value:%i length:%i"
+usb_i2c_tiny_unknown_request(int index,int request,int value,int length)
"index:%i request:0x%x value:%i length:%i"
+
# hw/usb/hcd-ohci.c
usb_ohci_iso_td_read_failed(uint32_t addr) "ISO_TD read error at %x"
usb_ohci_iso_td_head(uint32_t head, uint32_t tail, uint32_t flags, uint32_t
bp, uint32_t next, uint32_t be, uint32_t framenum, uint32_t startframe,
uint32_t framecount, int rel_frame_num) "ISO_TD ED head 0x%.8x tailp
0x%.8x\n0x%.8x 0x%.8x 0x%.8x 0x%.8x\nframe_number 0x%.8x starting_frame
0x%.8x\nframe_count 0x%.8x relative %d"
--
1.9.1
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