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Convert the whole driver to an MFD driver
This splits the driver into 4 modules: core, i2c, gpio and spi. It's that version that may be upstreamed.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,12 +1,13 @@ | ||
| PWD := $(shell pwd) | ||
| KVERSION := $(shell uname -r) | ||
| KERNEL_DIR ?= /lib/modules/$(KVERSION)/build | ||
| KDIR ?= /lib/modules/$(KVERSION)/build | ||
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| obj-m := ch341-buses.o | ||
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| ch341-buses-objs := ch341-core.o ch341-i2c.o ch341-gpio.o ch341-spi.o | ||
| obj-m += ch341-core.o | ||
| obj-m += i2c-ch341.o | ||
| obj-m += gpio-ch341.o | ||
| obj-m += spi-ch341.o | ||
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| all: | ||
| make -C $(KERNEL_DIR) M=$(PWD) modules | ||
| make -C $(KDIR) M=$(PWD) modules | ||
| clean: | ||
| make -C $(KERNEL_DIR) M=$(PWD) clean | ||
| make -C $(KDIR) M=$(PWD) clean |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,101 +1,69 @@ | ||
| // SPDX-License-Identifier: GPL-2.0 | ||
| /* | ||
| * Driver for the CH341A, and CH341B USB to I2C/SPI/GPIO adapter | ||
| * Driver for the CH341T USB to I2C adapter | ||
| * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO | ||
| * mode. There are cell drivers available for I2C and GPIO. SPI is not | ||
| * yet supported. | ||
| * | ||
| * Copyright 2021, Frank Zago | ||
| * Copyright 2022, Frank Zago | ||
| * Copyright (c) 2017 Gunar Schorcht ([email protected]) | ||
| * Copyright (c) 2016 Tse Lun Bien | ||
| * Copyright (c) 2014 Marco Gittler | ||
| * Copyright (c) 2006-2007 Till Harbaum ([email protected]) | ||
| * | ||
| * The full UART functionality is handled by the CH341 serial driver | ||
| */ | ||
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| #include <linux/kernel.h> | ||
| #include <linux/module.h> | ||
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| #include "ch341.h" | ||
| #include <linux/mfd/core.h> | ||
| #include <linux/module.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/usb.h> | ||
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| static void ch341_usb_free_device(struct ch341_device *dev) | ||
| { | ||
| ch341_spi_remove(dev); | ||
| ch341_gpio_remove(dev); | ||
| ch341_i2c_remove(dev); | ||
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| usb_set_intfdata(dev->iface, NULL); | ||
| usb_put_dev(dev->usb_dev); | ||
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| kfree(dev); | ||
| } | ||
| static const struct mfd_cell ch341_devs[] = { | ||
| { .name = "ch341-gpio", }, | ||
| { .name = "ch341-i2c", }, | ||
| }; | ||
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| static int ch341_usb_probe(struct usb_interface *iface, | ||
| const struct usb_device_id *usb_id) | ||
| { | ||
| struct usb_host_endpoint *endpoints; | ||
| struct ch341_device *dev; | ||
| int rc; | ||
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| dev = kzalloc(sizeof(struct ch341_device), GFP_KERNEL); | ||
| if (!dev) | ||
| struct usb_endpoint_descriptor *bulk_out; | ||
| struct usb_endpoint_descriptor *bulk_in; | ||
| struct usb_endpoint_descriptor *intr_in; | ||
| struct ch341_ddata *ddata; | ||
| int ret; | ||
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| ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); | ||
| if (!ddata) | ||
| return -ENOMEM; | ||
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| dev->usb_dev = usb_get_dev(interface_to_usbdev(iface)); | ||
| dev->iface = iface; | ||
| mutex_init(&dev->usb_lock); | ||
| ddata->usb_dev = interface_to_usbdev(iface); | ||
| mutex_init(&ddata->usb_lock); | ||
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| if (iface->cur_altsetting->desc.bNumEndpoints != 3) { | ||
| rc = -EIO; | ||
| goto free_dev; | ||
| ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, | ||
| &bulk_out, &intr_in, NULL); | ||
| if (ret) { | ||
| dev_err(&iface->dev, "Could not find all endpoints\n"); | ||
| return -ENODEV; | ||
| } | ||
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| endpoints = iface->cur_altsetting->endpoint; | ||
| if (!usb_endpoint_is_bulk_in(&endpoints[0].desc) || | ||
| !usb_endpoint_is_bulk_out(&endpoints[1].desc) || | ||
| !usb_endpoint_xfer_int(&endpoints[2].desc)) { | ||
| rc = -EIO; | ||
| goto free_dev; | ||
| } | ||
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| dev->ep_in = endpoints[0].desc.bEndpointAddress; | ||
| dev->ep_out = endpoints[1].desc.bEndpointAddress; | ||
| dev->ep_intr = endpoints[2].desc.bEndpointAddress; | ||
| dev->ep_intr_interval = endpoints[2].desc.bInterval; | ||
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| usb_set_intfdata(iface, dev); | ||
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| rc = ch341_i2c_init(dev); | ||
| if (rc) | ||
| goto free_dev; | ||
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| rc = ch341_gpio_init(dev); | ||
| if (rc) | ||
| goto rem_i2c; | ||
| ddata->ep_in = bulk_in->bEndpointAddress; | ||
| ddata->ep_out = bulk_out->bEndpointAddress; | ||
| ddata->ep_intr = intr_in->bEndpointAddress; | ||
| ddata->ep_intr_interval = intr_in->bInterval; | ||
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| rc = ch341_spi_init(dev); | ||
| if (rc) | ||
| goto rem_gpio; | ||
| usb_set_intfdata(iface, ddata); | ||
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| return 0; | ||
| ret = devm_mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, | ||
| ARRAY_SIZE(ch341_devs), NULL, 0, NULL); | ||
| if (ret) | ||
| dev_err(&iface->dev, "Failed to add child devices\n"); | ||
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| rem_gpio: | ||
| ch341_gpio_remove(dev); | ||
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| rem_i2c: | ||
| ch341_i2c_remove(dev); | ||
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| free_dev: | ||
| usb_put_dev(dev->usb_dev); | ||
| kfree(dev); | ||
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| return rc; | ||
| return ret; | ||
| } | ||
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| static void ch341_usb_disconnect(struct usb_interface *usb_if) | ||
| { | ||
| struct ch341_device *dev = usb_get_intfdata(usb_if); | ||
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| ch341_usb_free_device(dev); | ||
| } | ||
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| static const struct usb_device_id ch341_usb_table[] = { | ||
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@@ -105,14 +73,13 @@ static const struct usb_device_id ch341_usb_table[] = { | |
| MODULE_DEVICE_TABLE(usb, ch341_usb_table); | ||
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| static struct usb_driver ch341_usb_driver = { | ||
| .name = "ch341-buses", | ||
| .name = "ch341-mfd", | ||
| .id_table = ch341_usb_table, | ||
| .probe = ch341_usb_probe, | ||
| .disconnect = ch341_usb_disconnect | ||
| .disconnect = ch341_usb_disconnect, | ||
| }; | ||
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| module_usb_driver(ch341_usb_driver); | ||
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| MODULE_AUTHOR("Various"); | ||
| MODULE_DESCRIPTION("ch341 USB to I2C/SPI/GPIO adapter"); | ||
| MODULE_LICENSE("GPL v2"); | ||
| MODULE_AUTHOR("Frank Zago <[email protected]>"); | ||
| MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); | ||
| MODULE_LICENSE("GPL"); | ||
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