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Date: Sun, 5 Nov 2017 16:38:38 +0100
From: Johan Hovold <johan@...nel.org>
To: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: linux-kernel@...r.kernel.org, cphealy@...il.com,
Lucas Stach <l.stach@...gutronix.de>,
Nikita Yushchenko <nikita.yoush@...entembedded.com>,
Lee Jones <lee.jones@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Pavel Machek <pavel@....cz>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh@...nel.org>, Johan Hovold <johan@...nel.org>,
Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: Re: [PATCH v10 3/5] mfd: Add driver for RAVE Supervisory Processor
On Tue, Oct 31, 2017 at 09:36:54AM -0700, Andrey Smirnov wrote:
> Add a driver for RAVE Supervisory Processor, an MCU implementing
> various bits of housekeeping functionality (watchdoging, backlight
> control, LED control, etc) on RAVE family of products by Zodiac
> Inflight Innovations.
>
> This driver implementes core MFD/serdev device as well as
> communication subroutines necessary for commanding the device.
>
> Cc: linux-kernel@...r.kernel.org
> Cc: cphealy@...il.com
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Johan Hovold <johan@...nel.org>
> Cc: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
> Tested-by: Chris Healy <cphealy@...il.com>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
> +int rave_sp_exec(struct rave_sp *sp,
> + void *__data, size_t data_size,
> + void *reply_data, size_t reply_data_size)
> +{
> + struct rave_sp_reply reply = {
> + .data = reply_data,
> + .length = reply_data_size,
> + .received = COMPLETION_INITIALIZER_ONSTACK(reply.received),
> + };
> + unsigned char *data = __data;
> + int command, ret = 0;
> + u8 ackid;
> +
> + command = sp->variant->cmd.translate(data[0]);
> + if (command < 0)
> + return command;
> +
> + ackid = atomic_inc_return(&sp->ackid);
> + reply.ackid = ackid;
> + reply.code = rave_sp_reply_code((u8)command),
> +
> + mutex_lock(&sp->bus_lock);
> +
> + mutex_lock(&sp->reply_lock);
> + sp->reply = &reply;
> + mutex_unlock(&sp->reply_lock);
> +
> + data[0] = command;
> + data[1] = ackid;
> +
> + rave_sp_write(sp, data, data_size);
> +
> + if (!wait_for_completion_timeout(&reply.received, HZ)) {
> + dev_err(&sp->serdev->dev, "Command timeout\n");
> + ret = -ETIMEDOUT;
> +
> + mutex_lock(&sp->reply_lock);
> + sp->reply = NULL;
> + mutex_unlock(&sp->reply_lock);
> + }
> +
> + mutex_unlock(&sp->bus_lock);
> + return ret;
> +}
> +EXPORT_SYMBOL(rave_sp_exec);
EXPORT_SYMBOL_GPL?
> +static int rave_sp_receive_buf(struct serdev_device *serdev,
> + const unsigned char *buf, size_t size)
> +{
> + struct device *dev = &serdev->dev;
> + struct rave_sp *sp = dev_get_drvdata(dev);
> + struct rave_sp_deframer *deframer = &sp->deframer;
> + const unsigned char *src = buf;
> + const unsigned char *end = buf + size;
> + bool reset_framer = false;
> +
> + while (src < end) {
> + const unsigned char byte = *src++;
> +
> + switch (deframer->state) {
> + case RAVE_SP_EXPECT_SOF:
> + if (byte == RAVE_SP_STX)
> + deframer->state = RAVE_SP_EXPECT_DATA;
> + continue;
> +
> + case RAVE_SP_EXPECT_DATA:
> + switch (byte) {
> + case RAVE_SP_ETX:
> + rave_sp_receive_frame(sp,
> + deframer->data,
> + deframer->length);
> + reset_framer = true;
> + break;
> + case RAVE_SP_STX:
> + dev_warn(dev, "Bad frame: STX before ETX\n");
> + reset_framer = true;
> + break;
> + case RAVE_SP_DLE:
> + deframer->state = RAVE_SP_EXPECT_ESCAPED_DATA;
> + continue;
> + }
> +
> + case RAVE_SP_EXPECT_ESCAPED_DATA: /* FALLTHROUGH */
The fallthrough comment should precede the case statement (or you will
soon receive a patch from the people working enabling
-Wimplicit-fallthrough).
> + deframer->data[deframer->length++] = byte;
> +
> + if (deframer->length == sizeof(deframer->data)) {
> + dev_warn(dev, "Bad frame: Too long\n");
> + reset_framer = true;
> + break;
> + }
> +
> + deframer->state = RAVE_SP_EXPECT_DATA;
> + break;
> + }
> + }
> +
> + if (reset_framer) {
> + deframer->state = RAVE_SP_EXPECT_SOF;
> + deframer->length = 0;
> + }
> +
> + return src - buf;
> +}
> +MODULE_LICENSE("GPL v2");
This doesn't match the license text (GPL-2.0+).
> +MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@...entembedded.com>");
> +MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@...entembedded.com>");
> +MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@...il.com>");
> +MODULE_DESCRIPTION("RAVE SP core driver");
> diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
> index c11db8bceea1..989d38b587bf 100644
> --- a/drivers/platform/Kconfig
> +++ b/drivers/platform/Kconfig
> @@ -8,3 +8,4 @@ endif
> source "drivers/platform/goldfish/Kconfig"
>
> source "drivers/platform/chrome/Kconfig"
> +
This chunk should not be here.
> diff --git a/include/linux/rave-sp.h b/include/linux/rave-sp.h
> new file mode 100644
> index 000000000000..811929afc1a9
> --- /dev/null
> +++ b/include/linux/rave-sp.h
I think this one should live in include/linux/mfd/
> @@ -0,0 +1,54 @@
> +#ifndef _LINUX_RAVE_SP_H_
> +#define _LINUX_RAVE_SP_H_
> +
> +enum rave_sp_command {
> + RAVE_SP_CMD_GET_FIRMWARE_VERSION = 0x20,
> + RAVE_SP_CMD_GET_BOOTLOADER_VERSION = 0x21,
> + RAVE_SP_CMD_BOOT_SOURCE = 0x26,
> + RAVE_SP_CMD_GET_BOARD_COPPER_REV = 0x2B,
> + RAVE_SP_CMD_GET_GPIO_STATE = 0x2F,
> +
> + RAVE_SP_CMD_STATUS = 0xA0,
> + RAVE_SP_CMD_SW_WDT = 0xA1,
> + RAVE_SP_CMD_PET_WDT = 0xA2,
> + RAVE_SP_CMD_RESET = 0xA7,
> + RAVE_SP_CMD_RESET_REASON = 0xA8,
> +
> + RAVE_SP_CMD_REQ_COPPER_REV = 0xB6,
> + RAVE_SP_CMD_GET_I2C_DEVICE_STATUS = 0xBA,
> + RAVE_SP_CMD_GET_SP_SILICON_REV = 0xB9,
> + RAVE_SP_CMD_CONTROL_EVENTS = 0xBB,
> +
> + RAVE_SP_EVNT_BASE = 0xE0,
> +};
Johan
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