i2c kernel module (very untested and rough around the edges)
This commit is contained in:
parent
f9eb86b60e
commit
eaab9e05f8
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@ -1,5 +1,5 @@
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obj-m := dmj.o dmj-char.o
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obj-m := dmj.o dmj-char.o i2c-dmj.o
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KDIR := /lib/modules/$(shell uname -r)/build
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PWD := $(shell pwd)
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@ -20,7 +20,7 @@
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#include <linux/types.h>
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#if 0
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#include <linux/driver/dmj.h>
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#include <linux/mfd/dmj.h>
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#else
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#include "dmj.h"
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#endif
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@ -206,7 +206,7 @@ static int dmj_char_probe(struct platform_device *pdev)
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dev_info(pd, HARDWARE_NAME " /dev entries driver, major=%d, minor=%d\n",
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dmj_char_major, minor);
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dmjch = kzalloc(sizeof(*dmjch), GFP_KERNEL);
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dmjch = devm_kzalloc(pd, sizeof(*dmjch), GFP_KERNEL);
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if (!dmjch) return -ENOMEM;
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platform_set_drvdata(pdev, dmjch);
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@ -245,8 +245,6 @@ static int dmj_char_remove(struct platform_device *pdev)
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cdev_del(&dmjch->cdev);
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unregister_chrdev(MKDEV(dmj_char_major, dmjch->minor), CLASS_NAME);
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kfree(dmjch);
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return 0;
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}
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@ -318,4 +316,3 @@ MODULE_DESCRIPTION("Character device for the " HARDWARE_NAME " USB multitool");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:dmj-char");
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MODULE_DEPEND
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@ -3,6 +3,9 @@
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* Driver for the DapperMime-JTAG USB multitool: base MFD driver
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*
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* Copyright (c) sys64738 and haskal
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*
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* Adapted from:
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* dln2.c Copyright (c) 2014 Intel Corporation
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*/
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#include <linux/kernel.h>
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@ -403,9 +406,12 @@ static int dmj_hw_init(struct dmj_dev *dmj)
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/* MFD stuff */
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static const struct mfd_cell dmj_mfd_devs[] = {
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static const struct mfd_cell dmj_mfd_char[] = {
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{ .name = "dmj-char" },
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};
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static const struct mfd_cell dmj_mfd_i2c[] = {
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{ .name = "dmj-i2c" },
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};
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/* USB device control */
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@ -453,9 +459,9 @@ static int dmj_probe(struct usb_interface *itf, const struct usb_device_id *usb_
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}
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if (dmj->dmj_mode == 1) {
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ret = mfd_add_hotplug_devices(dev, dmj_mfd_devs, ARRAY_SIZE(dmj_mfd_devs));
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ret = mfd_add_hotplug_devices(dev, dmj_mfd_char, ARRAY_SIZE(dmj_mfd_char));
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if (ret) {
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dev_err(dev, "failed to add MFD devices\n");
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dev_err(dev, "failed to add MFD character devices\n");
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goto out_free;
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}
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@ -463,7 +469,11 @@ static int dmj_probe(struct usb_interface *itf, const struct usb_device_id *usb_
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// TODO: add SPI MFD
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}
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if (dmj->dmj_mode & DMJ_FEATURE_MODE1_I2C) {
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// TODO: add I2C MFD
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ret = mfd_add_hotplug_devices(dev, dmj_mfd_i2c, ARRAY_SIZE(dmj_mfd_i2c));
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if (ret) {
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dev_err(dev, "failed to add MFD I2C devices\n");
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goto out_free;
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}
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}
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if (dmj->dmj_mode & DMJ_FEATURE_MODE1_TEMPSENSOR) {
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// TODO: add tempsensor MFD
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@ -37,6 +37,18 @@ struct dmj_platform_data {
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#define DMJ_XFER_FLAGS_PARSE_RESP (1<<0)
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#define DMJ_XFER_FLAGS_FILL_RECVBUF (1<<1)
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inline static const char *dmj_get_protoerr(int err)
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{
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switch (err) {
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case DMJ_RESP_STAT_OK: return "ok";
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case DMJ_RESP_STAT_ILLCMD: return "unknown/unimplemented command";
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case DMJ_RESP_STAT_BADMODE: return "bad mode";
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case DMJ_RESP_STAT_NOSUCHMODE: return "no such mode available";
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case DMJ_RESP_STAT_BADARG: return "illegal argument";
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default: return "???";
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}
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}
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int dmj_transfer(struct platform_device *pdev, int cmd, int recvflags,
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const void *wbuf, int wbufsize, void *rbuf, int *rbufsize);
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@ -0,0 +1,285 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the DapperMime-JTAG USB multitool: USB-I2C adapter
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*
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* Copyright (c) sys64738 and haskal
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*
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* Adapted from:
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* i2c-dln2.c Copyright (c) 2014 Intel Corporation
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* i2c-tiny-usb.c Copyright (C) 2006-2007 Till Harbaum (Till@Harbaum.org)
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#if 0
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#include <linux/mfd/dmj.h>
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#else
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#include "dmj.h"
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#endif
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#define HARDWARE_NAME "DapperMime-JTAG"
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#define DMJ_I2C_MAX_XSFER_SIZE 64
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#define DMJ_I2C_CMD_ECHO 0x00
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#define DMJ_I2C_CMD_GET_FUNC 0x01
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#define DMJ_I2C_CMD_SET_DELAY 0x02
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#define DMJ_I2C_CMD_GET_STATUS 0x03
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#define DMJ_I2C_CMD_DO_XFER 0x04
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#define DMJ_I2C_CMD_DO_XFER_B 0x05
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#define DMJ_I2C_CMD_DO_XFER_E 0x06
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#define DMJ_I2C_CMD_DO_XFER_BE 0x07
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#define DMJ_I2C_FLG_XFER_B 0x01
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#define DMJ_I2C_FLG_XFER_E 0x02
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#define DMJ_I2C_STAT_IDLE 0
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#define DMJ_I2C_STAT_ACK 1
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#define DMJ_I2C_STAT_NAK 2
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static unsigned short delay = 10;
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module_param(delay, ushort, 0);
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MODULE_PARM_DESC(delay, "bit delay in microseconds (default is 10us for 100kHz)");
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struct dmj_i2c {
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struct platform_device *pdev;
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struct i2c_adapter adapter;
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};
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static int dmj_i2c_read(struct dmj_i2c *dmji, struct i2c_msg *msg, int cmd)
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{
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struct device *dev = &dmji->pdev->dev;
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uint8_t *respbuf;
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int ret, len;
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uint8_t cmdbuf[1+2+2+2]; /* cmd, flags, addr, len */
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len = msg->len;
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respbuf = kzalloc(len, GFP_KERNEL); /* 0 length: returns status byte */
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if (!respbuf) return -ENOMEM;
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cmdbuf[0] = cmd;
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cmdbuf[1] = (msg->flags >> 0) & 0xff;
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cmdbuf[2] = (msg->flags >> 8) & 0xff;
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cmdbuf[3] = (msg->addr >> 0) & 0xff;
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cmdbuf[4] = (msg->addr >> 8) & 0xff;
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cmdbuf[5] = (msg->len >> 0) & 0xff;
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cmdbuf[6] = (msg->len >> 8) & 0xff;
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ret = dmj_transfer(dmji->pdev, DMJ_CMD_MODE1_I2C, DMJ_XFER_FLAGS_PARSE_RESP,
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cmdbuf, sizeof(cmdbuf), respbuf, &len);
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if (ret < 0) {
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dev_err(dev, "read: USB comms error: %d\n", ret);
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goto err_free;
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} else if (ret) {
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dev_err(dev, "read: protocol error: %s (%d)\n", dmj_get_protoerr(ret), ret);
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ret = -EIO;
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goto err_free;
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}
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memcpy(msg->buf, respbuf, msg->len);
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kfree(respbuf);
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return len;
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err_free:
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kfree(respbuf);
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return ret;
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}
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static int dmj_i2c_write(struct dmj_i2c *dmji, struct i2c_msg *msg, int cmd)
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{
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struct device *dev = &dmji->pdev->dev;
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uint8_t *cmdbuf;
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int ret, len;
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len = msg->len + 1+2+2+2;
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cmdbuf = kzalloc(len, GFP_KERNEL); /* cmd, flags, addr, len */
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if (!cmdbuf) return -ENOMEM;
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cmdbuf[0] = cmd;
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cmdbuf[1] = (msg->flags >> 0) & 0xff;
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cmdbuf[2] = (msg->flags >> 8) & 0xff;
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cmdbuf[3] = (msg->addr >> 0) & 0xff;
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cmdbuf[4] = (msg->addr >> 8) & 0xff;
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cmdbuf[5] = (msg->len >> 0) & 0xff;
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cmdbuf[6] = (msg->len >> 8) & 0xff;
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memcpy(&cmdbuf[7], msg->buf, msg->len);
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ret = dmj_write(dmji->pdev, DMJ_CMD_MODE1_I2C, cmdbuf, len);
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if (ret < 0) {
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dev_err(dev, "write: USB comms error: %d\n", ret);
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goto err_free;
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} else if (ret) {
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dev_err(dev, "write: protocol error: %s (%d)\n", dmj_get_protoerr(ret), ret);
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ret = -EIO;
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goto err_free;
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}
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kfree(cmdbuf);
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return msg->len;
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err_free:
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kfree(cmdbuf);
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return ret;
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}
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static int dmj_i2c_xfer(struct i2c_adapter *a, struct i2c_msg *msgs, int nmsg)
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{
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struct dmj_i2c *dmji = i2c_get_adapdata(a);
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struct device *dev = &dmji->pdev->dev;
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struct i2c_msg *pmsg;
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int i, ret, cmd, stlen;
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uint8_t status, i2ccmd;
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for (i = 0; i < nmsg; ++i) {
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cmd = DMJ_I2C_CMD_DO_XFER;
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if (i == 0) cmd |= DMJ_I2C_FLG_XFER_B;
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if (i == nmsg-1) cmd |= DMJ_I2C_FLG_XFER_E;
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pmsg = &msgs[i];
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dev_dbg(&a->dev,
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" %d: %s (flags %04x) %d bytes to 0x%02x\n",
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i, pmsg->flags & I2C_M_RD ? "read" : "write",
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pmsg->flags, pmsg->len, pmsg->addr);
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if (pmsg->flags & I2C_M_RD) {
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ret = dmj_i2c_read(dmji, pmsg, cmd);
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if (ret < 0) goto err_ret;
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if (ret != pmsg->len) {
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dev_err(dev, "xfer rd: bad length %d vs %d\n", ret, pmsg->len);
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ret = -EMSGSIZE;
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goto err_ret;
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}
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} else {
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ret = dmj_i2c_write(dmji, pmsg, cmd);
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if (ret < 0) goto err_ret;
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if (ret != pmsg->len) {
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dev_err(dev, "xfer wr: bad length %d vs %d\n", ret, pmsg->len);
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ret = -EMSGSIZE;
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goto err_ret;
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}
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}
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/* read status */
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i2ccmd = DMJ_I2C_CMD_GET_STATUS;
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stlen = sizeof(status);
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ret = dmj_transfer(dmji->pdev, DMJ_CMD_MODE1_I2C, DMJ_XFER_FLAGS_PARSE_RESP,
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&i2ccmd, sizeof(i2ccmd), &status, &stlen);
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if (ret < 0) {
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dev_err(dev, "xfer get stat: USB comms error: %d\n", ret);
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goto err_ret;
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} else if (ret) {
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dev_err(dev, "xfer get stat: protocol error: %s (%d)\n", dmj_get_protoerr(ret), ret);
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ret = -EIO;
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goto err_ret;
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} else if (stlen != sizeof(status)) {
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dev_err(dev, "xfer get stat: unexpected return length: want %zu, got %d\n", sizeof(status), stlen);
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ret = -EMSGSIZE;
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goto err_ret;
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}
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dev_dbg(dev, " status = %d\n", status);
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if (status == DMJ_I2C_STAT_NAK) {
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ret = -ENXIO;
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goto err_ret;
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}
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}
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ret = i;
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err_ret:
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return ret;
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}
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static uint32_t dmj_i2c_func(struct i2c_adapter *a)
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{
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struct dmj_i2c *dmji = i2c_get_adapdata(a);
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struct device *dev = &dmji->pdev->dev;
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__le32 func = 0;
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int len = sizeof(func), ret;
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uint8_t i2ccmd = DMJ_I2C_CMD_GET_FUNC;
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ret = dmj_transfer(dmji->pdev, DMJ_CMD_MODE1_I2C, DMJ_XFER_FLAGS_PARSE_RESP,
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&i2ccmd, sizeof(i2ccmd), &func, &len);
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if (ret < 0) {
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dev_err(dev, "func: USB comms error: %d\n", ret);
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return 0;
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} else if (ret) {
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dev_err(dev, "func: protocol error: %s (%d)\n", dmj_get_protoerr(ret), ret);
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return 0;
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} else if (len != sizeof(func)) {
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dev_err(dev, "func: unexpected return length: want %zu, got %d\n", sizeof(func), len);
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return 0;
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}
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dev_warn(dev, "I2C functionality: 0x%08x\n", le32_to_cpu(func));
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return le32_to_cpu(func);
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}
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static const struct i2c_algorithm dmj_i2c_algo = {
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.master_xfer = dmj_i2c_xfer,
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.functionality = dmj_i2c_func
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};
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static const struct i2c_adapter_quirks dmj_i2c_quirks = {
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.max_read_len = DMJ_I2C_MAX_XSFER_SIZE,
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.max_write_len = DMJ_I2C_MAX_XSFER_SIZE,
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};
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static int dmj_i2c_probe(struct platform_device *pdev)
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{
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int ret;
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struct dmj_i2c *dmji;
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struct device *dev = &pdev->dev;
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// TODO: check if mode 1 and I2C available?
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// TODO: test ECHO cmd
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dmji = devm_kzalloc(dev, sizeof(*dmji), GFP_KERNEL);
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if (!dmji) return -ENOMEM;
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dmji->pdev = pdev;
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dmji->adapter.owner = THIS_MODULE;
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dmji->adapter.class = I2C_CLASS_HWMON;
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dmji->adapter.algo = &dmj_i2c_algo;
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dmji->adapter.quirks = &dmj_i2c_quirks; /* TODO: is this needed? probably... */
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dmji->adapter.dev.of_node = dev->of_node;
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i2c_set_adapdata(&dmji->adapter, dmji);
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// TODO: set delay from module param
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snprintf(dmji->adapter.name, sizeof(dmji->adapter.name), "%s-%s",
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"dln2-i2c", dev_name(pdev->dev.parent));
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platform_set_drvdata(pdev, dmji);
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return i2c_add_adapter(&dmji->adapter);
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}
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static int dmj_i2c_remove(struct platform_device *pdev)
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{
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struct dmj_i2c *dmji = platform_get_drvdata(pdev);
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i2c_del_adapter(&dmji->adapter);
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return 0;
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}
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static struct platform_driver dmj_i2c_drv = {
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.driver.name = "dmj-i2c",
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.probe = dmj_i2c_probe,
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.remove = dmj_i2c_remove
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};
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module_platform_driver(dmj_i2c_drv);
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MODULE_AUTHOR("sys64738 <sys64738@disroot.org>");
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MODULE_AUTHOR("haskal <haskal@awoo.systems>");
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MODULE_DESCRIPTION("I2C interface driver for the " HARDWARE_NAME " USB multitool");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:dmj-i2c");
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@ -263,8 +263,7 @@ void i2ctu_bulk_cmd(void) {
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vnd_cfg_write_resp(cfg_resp_ok, (uint32_t)us, txbuf);
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} else if (cmd.len == 0) {
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handle_probe(&cmd);
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txbuf[0] = status;
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vnd_cfg_write_resp(cfg_resp_ok, 1, txbuf);
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vnd_cfg_write_resp(cfg_resp_ok, 0, NULL);
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} else {
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us = cmd.len;
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if (us > sizeof rxbuf) us = sizeof rxbuf;
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@ -272,6 +271,7 @@ void i2ctu_bulk_cmd(void) {
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rxbuf[i] = vnd_cfg_read_byte();
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handle_write(&cmd);
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vnd_cfg_write_resp(cfg_resp_ok, 0, NULL);
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}
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} break;
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