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i2c: Add Intel USBIO I2C driver

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Add a a driver for the I2C auxbus child device of the Intel USBIO USB
IO-expander used by the MIPI cameras on various new (Meteor Lake and
later) Intel laptops.

Co-developed-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Israel Cepeda <israel.a.cepeda.lopez@intel.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20250911181343.77398-4-hansg@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Israel Cepeda 2025-09-11 20:13:43 +02:00 committed by Greg Kroah-Hartman
parent c122451ce0
commit daf161343a
4 changed files with 333 additions and 0 deletions
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1
MAINTAINERS
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@ -12694,6 +12694,7 @@ M: Hans de Goede <hansg@kernel.org>
R: Sakari Ailus <sakari.ailus@linux.intel.com>
S: Maintained
F: drivers/gpio/gpio-usbio.c
F: drivers/i2c/busses/i2c-usbio.c
F: drivers/usb/misc/usbio.c
F: include/linux/usb/usbio.h

11
drivers/i2c/busses/Kconfig
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@ -1357,6 +1357,17 @@ config I2C_LJCA
This driver can also be built as a module. If so, the module
will be called i2c-ljca.
config I2C_USBIO
tristate "Intel USBIO I2C Adapter support"
depends on USB_USBIO
default USB_USBIO
help
Select this option to enable I2C driver for the INTEL
USBIO driver stack.
This driver can also be built as a module. If so, the module
will be called i2c_usbio.
config I2C_CP2615
tristate "Silicon Labs CP2615 USB sound card and I2C adapter"
depends on USB

1
drivers/i2c/busses/Makefile
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@ -135,6 +135,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o
obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o
obj-$(CONFIG_I2C_USBIO) += i2c-usbio.o
obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o

320
drivers/i2c/busses/i2c-usbio.c Normal file
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@ -0,0 +1,320 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2025 Intel Corporation.
* Copyright (c) 2025 Red Hat, Inc.
*/
#include <linux/auxiliary_bus.h>
#include <linux/dev_printk.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/usb/usbio.h>
#define I2C_RW_OVERHEAD (sizeof(struct usbio_bulk_packet) + sizeof(struct usbio_i2c_rw))
struct usbio_i2c {
struct i2c_adapter adap;
struct auxiliary_device *adev;
struct usbio_i2c_rw *rwbuf;
unsigned long quirks;
u32 speed;
u16 txbuf_len;
u16 rxbuf_len;
};
static const struct acpi_device_id usbio_i2c_acpi_hids[] = {
{ "INTC1008" }, /* MTL */
{ "INTC10B3" }, /* ARL */
{ "INTC10B6" }, /* LNL */
{ "INTC10E3" }, /* PTL */
{ }
};
static const u32 usbio_i2c_speeds[] = {
I2C_MAX_STANDARD_MODE_FREQ,
I2C_MAX_FAST_MODE_FREQ,
I2C_MAX_FAST_MODE_PLUS_FREQ,
I2C_MAX_HIGH_SPEED_MODE_FREQ
};
static void usbio_i2c_uninit(struct i2c_adapter *adap, struct i2c_msg *msg)
{
struct usbio_i2c *i2c = i2c_get_adapdata(adap);
struct usbio_i2c_uninit ubuf;
ubuf.busid = i2c->adev->id;
ubuf.config = cpu_to_le16(msg->addr);
usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C, USBIO_I2CCMD_UNINIT, true,
&ubuf, sizeof(ubuf), NULL, 0);
}
static int usbio_i2c_init(struct i2c_adapter *adap, struct i2c_msg *msg)
{
struct usbio_i2c *i2c = i2c_get_adapdata(adap);
struct usbio_i2c_init ibuf;
void *reply_buf;
u16 reply_len;
int ret;
ibuf.busid = i2c->adev->id;
ibuf.config = cpu_to_le16(msg->addr);
ibuf.speed = cpu_to_le32(i2c->speed);
if (i2c->quirks & USBIO_QUIRK_I2C_NO_INIT_ACK) {
reply_buf = NULL;
reply_len = 0;
} else {
reply_buf = &ibuf;
reply_len = sizeof(ibuf);
}
ret = usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C, USBIO_I2CCMD_INIT, true,
&ibuf, sizeof(ibuf), reply_buf, reply_len);
if (ret != sizeof(ibuf))
return (ret < 0) ? ret : -EIO;
return 0;
}
static int usbio_i2c_read(struct i2c_adapter *adap, struct i2c_msg *msg)
{
struct usbio_i2c *i2c = i2c_get_adapdata(adap);
u16 rxchunk = i2c->rxbuf_len - I2C_RW_OVERHEAD;
struct usbio_i2c_rw *rbuf = i2c->rwbuf;
int ret;
rbuf->busid = i2c->adev->id;
rbuf->config = cpu_to_le16(msg->addr);
rbuf->size = cpu_to_le16(msg->len);
if (msg->len > rxchunk) {
/* Need to split the input buffer */
u16 len = 0;
do {
if (msg->len - len < rxchunk)
rxchunk = msg->len - len;
ret = usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C,
USBIO_I2CCMD_READ, true,
rbuf, len == 0 ? sizeof(*rbuf) : 0,
rbuf, sizeof(*rbuf) + rxchunk);
if (ret < 0)
return ret;
memcpy(&msg->buf[len], rbuf->data, rxchunk);
len += rxchunk;
} while (msg->len > len);
return 0;
}
ret = usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C, USBIO_I2CCMD_READ, true,
rbuf, sizeof(*rbuf), rbuf, sizeof(*rbuf) + msg->len);
if (ret != sizeof(*rbuf) + msg->len)
return (ret < 0) ? ret : -EIO;
memcpy(msg->buf, rbuf->data, msg->len);
return 0;
}
static int usbio_i2c_write(struct i2c_adapter *adap, struct i2c_msg *msg)
{
struct usbio_i2c *i2c = i2c_get_adapdata(adap);
u16 txchunk = i2c->txbuf_len - I2C_RW_OVERHEAD;
struct usbio_i2c_rw *wbuf = i2c->rwbuf;
int ret;
if (msg->len > txchunk) {
/* Need to split the output buffer */
u16 len = 0;
do {
wbuf->busid = i2c->adev->id;
wbuf->config = cpu_to_le16(msg->addr);
if (i2c->quirks & USBIO_QUIRK_I2C_USE_CHUNK_LEN)
wbuf->size = cpu_to_le16(txchunk);
else
wbuf->size = cpu_to_le16(msg->len);
memcpy(wbuf->data, &msg->buf[len], txchunk);
len += txchunk;
ret = usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C,
USBIO_I2CCMD_WRITE, msg->len == len,
wbuf, sizeof(*wbuf) + txchunk,
wbuf, sizeof(*wbuf));
if (ret < 0)
return ret;
if (msg->len - len < txchunk)
txchunk = msg->len - len;
} while (msg->len > len);
return 0;
}
wbuf->busid = i2c->adev->id;
wbuf->config = cpu_to_le16(msg->addr);
wbuf->size = cpu_to_le16(msg->len);
memcpy(wbuf->data, msg->buf, msg->len);
ret = usbio_bulk_msg(i2c->adev, USBIO_PKTTYPE_I2C, USBIO_I2CCMD_WRITE, true,
wbuf, sizeof(*wbuf) + msg->len, wbuf, sizeof(*wbuf));
if (ret != sizeof(*wbuf) || le16_to_cpu(wbuf->size) != msg->len)
return (ret < 0) ? ret : -EIO;
return 0;
}
static int usbio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
struct usbio_i2c *i2c = i2c_get_adapdata(adap);
int ret;
usbio_acquire(i2c->adev);
ret = usbio_i2c_init(adap, msgs);
if (ret)
goto out_release;
for (int i = 0; i < num; ret = ++i) {
if (msgs[i].flags & I2C_M_RD)
ret = usbio_i2c_read(adap, &msgs[i]);
else
ret = usbio_i2c_write(adap, &msgs[i]);
if (ret)
break;
}
usbio_i2c_uninit(adap, msgs);
out_release:
usbio_release(i2c->adev);
return ret;
}
static u32 usbio_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_adapter_quirks usbio_i2c_quirks = {
.flags = I2C_AQ_NO_ZERO_LEN | I2C_AQ_NO_REP_START,
.max_read_len = SZ_4K,
.max_write_len = SZ_4K,
};
static const struct i2c_adapter_quirks usbio_i2c_quirks_max_rw_len52 = {
.flags = I2C_AQ_NO_ZERO_LEN | I2C_AQ_NO_REP_START,
.max_read_len = 52,
.max_write_len = 52,
};
static const struct i2c_algorithm usbio_i2c_algo = {
.master_xfer = usbio_i2c_xfer,
.functionality = usbio_i2c_func,
};
static int usbio_i2c_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *adev_id)
{
struct usbio_i2c_bus_desc *i2c_desc;
struct device *dev = &adev->dev;
struct usbio_i2c *i2c;
u32 max_speed;
int ret;
i2c_desc = dev_get_platdata(dev);
if (!i2c_desc)
return -EINVAL;
i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
i2c->adev = adev;
usbio_acpi_bind(i2c->adev, usbio_i2c_acpi_hids);
usbio_get_txrxbuf_len(i2c->adev, &i2c->txbuf_len, &i2c->rxbuf_len);
i2c->rwbuf = devm_kzalloc(dev, max(i2c->txbuf_len, i2c->rxbuf_len), GFP_KERNEL);
if (!i2c->rwbuf)
return -ENOMEM;
i2c->quirks = usbio_get_quirks(i2c->adev);
max_speed = usbio_i2c_speeds[i2c_desc->caps & USBIO_I2C_BUS_MODE_CAP_MASK];
if (max_speed < I2C_MAX_FAST_MODE_FREQ &&
(i2c->quirks & USBIO_QUIRK_I2C_ALLOW_400KHZ))
max_speed = I2C_MAX_FAST_MODE_FREQ;
i2c->speed = i2c_acpi_find_bus_speed(dev);
if (!i2c->speed)
i2c->speed = I2C_MAX_STANDARD_MODE_FREQ;
else if (i2c->speed > max_speed) {
dev_warn(dev, "Invalid speed %u adjusting to bus max %u\n",
i2c->speed, max_speed);
i2c->speed = max_speed;
}
i2c->adap.owner = THIS_MODULE;
i2c->adap.class = I2C_CLASS_HWMON;
i2c->adap.dev.parent = dev;
i2c->adap.algo = &usbio_i2c_algo;
if (i2c->quirks & USBIO_QUIRK_I2C_MAX_RW_LEN_52)
i2c->adap.quirks = &usbio_i2c_quirks_max_rw_len52;
else
i2c->adap.quirks = &usbio_i2c_quirks;
snprintf(i2c->adap.name, sizeof(i2c->adap.name), "%s.%d",
USBIO_I2C_CLIENT, i2c->adev->id);
device_set_node(&i2c->adap.dev, dev_fwnode(&adev->dev));
auxiliary_set_drvdata(adev, i2c);
i2c_set_adapdata(&i2c->adap, i2c);
ret = i2c_add_adapter(&i2c->adap);
if (ret)
return ret;
if (has_acpi_companion(&i2c->adap.dev))
acpi_dev_clear_dependencies(ACPI_COMPANION(&i2c->adap.dev));
return 0;
}
static void usbio_i2c_remove(struct auxiliary_device *adev)
{
struct usbio_i2c *i2c = auxiliary_get_drvdata(adev);
i2c_del_adapter(&i2c->adap);
}
static const struct auxiliary_device_id usbio_i2c_id_table[] = {
{ "usbio.usbio-i2c" },
{ }
};
MODULE_DEVICE_TABLE(auxiliary, usbio_i2c_id_table);
static struct auxiliary_driver usbio_i2c_driver = {
.name = USBIO_I2C_CLIENT,
.probe = usbio_i2c_probe,
.remove = usbio_i2c_remove,
.id_table = usbio_i2c_id_table
};
module_auxiliary_driver(usbio_i2c_driver);
MODULE_DESCRIPTION("Intel USBIO I2C driver");
MODULE_AUTHOR("Israel Cepeda <israel.a.cepeda.lopez@intel.com>");
MODULE_AUTHOR("Hans de Goede <hansg@kernel.org>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("USBIO");