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[0/4] usb: typec: ucsi: add support for stm32g0

Message ID 20220624155413.399190-1-fabrice.gasnier@foss.st.com
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Series usb: typec: ucsi: add support for stm32g0 | expand

Message

Fabrice Gasnier June 24, 2022, 3:54 p.m. UTC 
STM32G0 provides an integrated USB Type-C and power delivery interface [1].
It can be programmed with a firmware [2] to act as a PPM. Currently it
implements UCSI protocol over I2C interface. A GPIO is used as an interrupt
line.

This series adds a driver to support it, including:
- dt-bindings documentation
- optional STM32G0 firmware control and update, over a secondary I2C address
- power management

[1] https://wiki.st.com/stm32mcu/wiki/Introduction_to_USB_Power_Delivery_with_STM32
[2] https://github.com/STMicroelectronics/x-cube-ucsi

Fabrice Gasnier (4):
  dt-bindings: usb: typec: add bindings for stm32g0 controller
  usb: typec: ucsi: stm32g0: add support for stm32g0 i2c controller
  usb: typec: ucsi: stm32g0: add bootloader support
  usb: typec: ucsi: stm32g0: add support for power management

 .../bindings/usb/st,typec-stm32g0.yaml        |  83 ++
 drivers/usb/typec/ucsi/Kconfig                |  10 +
 drivers/usb/typec/ucsi/Makefile               |   1 +
 drivers/usb/typec/ucsi/ucsi_stm32g0.c         | 777 ++++++++++++++++++
 4 files changed, 871 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/st,typec-stm32g0.yaml
 create mode 100644 drivers/usb/typec/ucsi/ucsi_stm32g0.c

Comments

Christophe JAILLET June 25, 2022, 6:37 a.m. UTC | #1 
Le 24/06/2022 à 17:54, Fabrice Gasnier a écrit :
> STM32G0 provides an integrated USB Type-C and power delivery interface.
> It can be programmed with a firmware to handle UCSI protocol over I2C
> interface. A GPIO is used as an interrupt line.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier-rj0Iel/JR4NBDgjK7y7TUQ@public.gmane.org>
> ---
>   drivers/usb/typec/ucsi/Kconfig        |  10 ++
>   drivers/usb/typec/ucsi/Makefile       |   1 +
>   drivers/usb/typec/ucsi/ucsi_stm32g0.c | 218 ++++++++++++++++++++++++++
>   3 files changed, 229 insertions(+)
>   create mode 100644 drivers/usb/typec/ucsi/ucsi_stm32g0.c
> 

[...]

> +static int ucsi_stm32g0_async_write(struct ucsi *ucsi, unsigned int offset, const void *val,
> +				    size_t len)
> +{
> +	struct ucsi_stm32g0 *g0 = ucsi_get_drvdata(ucsi);
> +	struct i2c_client *client = g0->client;
> +	struct i2c_msg msg[] = {
> +		{
> +			.addr	= client->addr,
> +			.flags  = 0,
> +		}
> +	};
> +	unsigned char *buf;
> +	int ret;
> +
> +	buf = kzalloc(len + 1, GFP_KERNEL);

Hi,

Nit: kmalloc() would be enough here, the whole buffer is written just a 
few lines after.

> +	if (!buf)
> +		return -ENOMEM;
> +
> +	buf[0] = offset;
> +	memcpy(&buf[1], val, len);
> +	msg[0].len = len + 1;
> +	msg[0].buf = buf;
> +
> +	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
> +	kfree(buf);
> +	if (ret != ARRAY_SIZE(msg)) {
> +		dev_err(g0->dev, "i2c write %02x, %02x error: %d\n", client->addr, buf[0], ret);

Use-after-free of buf.

> +
> +		return ret < 0 ? ret : -EIO;
> +	}
> +
> +	return 0;
> +}
> +

Just my 2c,
CJ

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