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Message-ID: <20181003153204.ou3zup3jeoa34vvc@Ettosoft-T55>
Date: Wed, 3 Oct 2018 17:50:04 +0200
From: ektor5 <ek5.chimenti@...il.com>
To: jacopo mondi <jacopo@...ndi.org>
Cc: hverkuil@...all.nl, luca.pisani@...o.org, jose.abreu@...opsys.com,
sean@...s.org, sakari.ailus@...ux.intel.com,
Mauro Carvalho Chehab <mchehab@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
Hans Verkuil <hans.verkuil@...co.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Jacob Chen <jacob-chen@...wrt.com>,
Jacopo Mondi <jacopo+renesas@...ndi.org>,
Neil Armstrong <narmstrong@...libre.com>,
Todor Tomov <todor.tomov@...aro.org>,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] media: add SECO cec driver
Hi Jacopo,
Thanks for the quick reply, I will respond inline,
On Wed, Oct 03, 2018 at 11:35:32AM +0200, jacopo mondi wrote:
> Hi Ettore,
> thanks for the patch.
>
> A few comments below, please have a look...
>
> On Tue, Oct 02, 2018 at 06:59:55PM +0200, ektor5 wrote:
> > From: Ettore Chimenti <ek5.chimenti@...il.com>
> >
> > This patch adds support to the CEC device implemented with a STM32
> > microcontroller in X86 SECO Boards, including UDOO X86.
> >
> > The communication is achieved via Braswell integrated SMBus
> > (i2c-i801). The driver use direct access to the PCI addresses, due to
> > the limitations of the specific driver in presence of ACPI calls.
> >
> > The basic functionalities are tested with success with cec-ctl and
> > cec-compliance.
> >
> > Inspired by cros-ec-cec implementation, attaches to i915 driver
> > cec-notifier.
> >
> > Signed-off-by: Ettore Chimenti <ek5.chimenti@...il.com>
> > ---
> > MAINTAINERS | 6 +
> > drivers/media/platform/Kconfig | 11 +
> > drivers/media/platform/Makefile | 4 +
> > drivers/media/platform/seco-cec/Makefile | 1 +
> > drivers/media/platform/seco-cec/seco-cec.c | 729 +++++++++++++++++++++
> > drivers/media/platform/seco-cec/seco-cec.h | 132 ++++
> > 6 files changed, 883 insertions(+)
> > create mode 100644 drivers/media/platform/seco-cec/Makefile
> > create mode 100644 drivers/media/platform/seco-cec/seco-cec.c
> > create mode 100644 drivers/media/platform/seco-cec/seco-cec.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 4ece30f15777..1062912a5ff4 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -12972,6 +12972,12 @@ L: sdricohcs-devel@...ts.sourceforge.net (subscribers-only)
> > S: Maintained
> > F: drivers/mmc/host/sdricoh_cs.c
> >
> > +SECO BOARDS CEC DRIVER
> > +M: Ettore Chimenti <ek5.chimenti@...il.com>
> > +S: Maintained
> > +F: drivers/media/platform/seco-cec/seco-cec.c
> > +F: drivers/media/platform/seco-cec/seco-cec.h
> > +
> > SECURE COMPUTING > > M: Kees Cook <keescook@...omium.org>
> > R: Andy Lutomirski <luto@...capital.net>
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index 94c1fe0e9787..f477764b902a 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -613,6 +613,17 @@ config VIDEO_TEGRA_HDMI_CEC
> > The CEC bus is present in the HDMI connector and enables communication
> > between compatible devices.
> >
> > +config VIDEO_SECO_CEC
> > + tristate "SECO Boards HDMI CEC driver"
> > + depends on (X86 || IA64) || COMPILE_TEST
> > + select CEC_CORE
> > + select CEC_NOTIFIER
> > + help
> > + This is a driver for SECO Boards integrated CEC interface. It uses the
> > + generic CEC framework interface.
>
> Is it worth mentioning the software framework used for implementing the driver?
> Anyway, I see this is common to most of the CEC drivers here, so I
> guess it is fine
>
> > + CEC bus is present in the HDMI connector and enables communication
> > + between compatible devices.
> > +
> > endif #CEC_PLATFORM_DRIVERS
> >
> > menuconfig SDR_PLATFORM_DRIVERS
> > diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> > index 41322ab65802..cc7365c787ba 100644
> > --- a/drivers/media/platform/Makefile
> > +++ b/drivers/media/platform/Makefile
> > @@ -53,6 +53,10 @@ obj-$(CONFIG_VIDEO_TEGRA_HDMI_CEC) += tegra-cec/
> >
> > obj-y += stm32/
> >
> > +obj-$(CONFIG_VIDEO_SECO_CEC) += seco-cec/
> > +
> > +obj-y += blackfin/
> > +
>
> Ups! Is this a leftover from some BSP code? It breaks the build on
> media-tree master (and I guess on master too)
Ops! Yes, seems some merging/rebasing-related problem happened. Yes,
will remove.
>
> > obj-y += davinci/
> >
> > obj-$(CONFIG_VIDEO_SH_VOU) += sh_vou.o
> > diff --git a/drivers/media/platform/seco-cec/Makefile b/drivers/media/platform/seco-cec/Makefile
> > new file mode 100644
> > index 000000000000..a3f2c6bd3ac0
> > --- /dev/null
> > +++ b/drivers/media/platform/seco-cec/Makefile
> > @@ -0,0 +1 @@
> > +obj-$(CONFIG_VIDEO_SECO_CEC) += seco-cec.o
>
> This can simply be obj-y as you parse this makefile entry
> conditionally to the presence of the CONFIG_VIDEO_SECO_CEC symbol
I agree.
>
> > diff --git a/drivers/media/platform/seco-cec/seco-cec.c b/drivers/media/platform/seco-cec/seco-cec.c
> > new file mode 100644
> > index 000000000000..ba3b7c144a87
> > --- /dev/null
> > +++ b/drivers/media/platform/seco-cec/seco-cec.c
> > @@ -0,0 +1,729 @@
> > +// SPDX-License-Identifier: GPL-2.0 AND BSD-3-Clause
>
> Just make sure the AND is what you want (I only see OR clauses in
> drivers/ code). See Documentation/process/license-rules.rst
Yes, I was confused by the syntax, I agree with the OR in any case.
>
> > +/*
> > + *
> Nit: empty comment line
> > + * CEC driver for SECO X86 Boards
> > + *
> > + * Author: Ettore Chimenti <ek5.chimenti@...il.com>
> > + * Copyright (C) 2018, SECO Srl.
> > + * Copyright (C) 2018, Aidilab Srl.
> > + *
> Nit: empty comment line
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/acpi.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/delay.h>
> > +#include <linux/pci.h>
> > +#include <linux/dmi.h>
> > +
> > +/* CEC Framework */
> > +#include <media/cec.h>
> > +
> > +#include "seco-cec.h"
>
> I would question why a header file is needed as it is not included by
> anything else
Well, I was working on a really big file with a lot of definitions at
the beginning and I wasn't sure if the Consumer-IR could be nicer to
split, that is why.
>
> > +
> > +struct secocec_data {
> > + struct device *dev;
> > + struct platform_device *pdev;
> > + struct cec_adapter *cec_adap;
> > + struct cec_notifier *notifier;
> > + int irq;
> > +};
> > +
> > +#define smb_wr16(cmd, data) smb_word_op(CMD_WORD_DATA, SECOCEC_MICRO_ADDRESS, \
> > + cmd, data, SMBUS_WRITE, NULL)
> > +#define smb_rd16(cmd, res) smb_word_op(CMD_WORD_DATA, SECOCEC_MICRO_ADDRESS, \
> > + cmd, 0, SMBUS_READ, res)
> > +
> > +static int smb_word_op(short data_format, u16 slave_addr, u8 cmd, u16 data,
> > + u8 operation, u16 *result)
> > +{
> > + unsigned int count;
> > + short _data_format;
> > + int ret, status = 0;
>
> In the rest of the function ret is used only once, and you can use
> status in its place. Please drop one of the two.
>
> > +
> > + switch (data_format) {
> > + case CMD_BYTE_DATA:
> > + _data_format = BRA_SMB_CMD_BYTE_DATA;
> > + break;
> > + case CMD_WORD_DATA:
> > + _data_format = BRA_SMB_CMD_WORD_DATA;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + /* Active wait until ready */
> > + for (count = 0; count <= SMBTIMEOUT; ++count) {
> > + if (!(inb(HSTS) & BRA_INUSE_STS))
> > + break;
> > + udelay(SMB_POLL_UDELAY);
> > + }
> > +
> > + if (count > SMBTIMEOUT) {
> > + /* Reset the lock instead of failing */
> > + outb(0xff, HSTS);
> > + pr_warn("%s: SMBTIMEOUT\n", __func__);
>
> No pr_debug/pr_warn if possible, please.
Yes, probably better to handle this in a different way.
>
> > + }
> > +
> > + outb(0x00, HCNT);
> > + outb((u8)(slave_addr & 0xfe) | operation, XMIT_SLVA);
> > + outb(cmd, HCMD);
> > + inb(HCNT);
> > +
> > + if (operation == SMBUS_WRITE) {
> > + outb((u8)data, HDAT0);
> > + outb((u8)(data >> 8), HDAT1);
> > + pr_debug("%s: WRITE (0x%02x - count %05d): 0x%04x\n",
> > + __func__, cmd, count, data);
> > + }
> > +
> > + outb(BRA_START + _data_format, HCNT);
> > +
> > + for (count = 0; count <= SMBTIMEOUT; count++) {
> > + if (!(inb(HSTS) & BRA_HOST_BUSY))
> > + break;
> > + udelay(SMB_POLL_UDELAY);
> > + }
> > +
> > + if (count > SMBTIMEOUT) {
> > + pr_debug("%s: SMBTIMEOUT_1\n", __func__);
> > + status = -EBUSY;
> > + goto err;
> > + }
> > +
> > + ret = inb(HSTS);
> > + if (ret & BRA_HSTS_ERR_MASK) {
> > + pr_debug("%s: HSTS(0x%02X): 0x%X\n", __func__, cmd, ret);
> > + status = -EIO;
> > + goto err;
> > + }
> > +
> > + if (operation == SMBUS_READ) {
> > + *result = ((inb(HDAT0) & 0xff) + ((inb(HDAT1) & 0xff) << 8));
> > + pr_debug("%s: READ (0x%02x - count %05d): 0x%04x\n",
> > + __func__, cmd, count, *result);
> > + }
> > +
> > +err:
> > + outb(0xff, HSTS);
> > + return status;
> > +}
> > +
> > +static int secocec_adap_enable(struct cec_adapter *adap, bool enable)
> > +{
> > + struct secocec_data *cec = cec_get_drvdata(adap);
> > + struct device *dev = cec->dev;
> > + u16 val = 0;
> > + int status;
> > +
> > + if (enable) {
> > + /* Clear the status register */
> > + status = smb_rd16(SECOCEC_STATUS_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_STATUS_REG_1, val);
> > + if (status)
> > + goto err;
> > +
> > + /* Enable the interrupts */
> > + status = smb_rd16(SECOCEC_ENABLE_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1,
> > + val | SECOCEC_ENABLE_REG_1_CEC);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "Device enabled");
> > +
>
> Empty line
>
> > + } else {
> > + /* Clear the status register */
> > + status = smb_rd16(SECOCEC_STATUS_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_STATUS_REG_1, val);
> > + if (status)
> > + goto err;
> > +
> > + /* Disable the interrupts */
> > + status = smb_rd16(SECOCEC_ENABLE_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1, val &
> > + ~SECOCEC_ENABLE_REG_1_CEC &
> > + ~SECOCEC_ENABLE_REG_1_IR);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "Device disabled");
> > + }
> > +
> > + return 0;
> > +err:
> > + dev_err(dev, "Adapter setup failed (%d)", status);
> > + return status;
> > +}
> > +
> > +static int secocec_adap_log_addr(struct cec_adapter *adap, u8 logical_addr)
> > +{
> > + u16 enable_val = 0;
> > + int status;
> > +
> > + /* Disable device */
> > + status = smb_rd16(SECOCEC_ENABLE_REG_1, &enable_val);
> > + if (status)
> > + return status;
> > +
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1,
> > + enable_val & ~SECOCEC_ENABLE_REG_1_CEC);
> > + if (status)
> > + return status;
> > +
> > + /* Write logical address */
> > + status = smb_wr16(SECOCEC_DEVICE_LA, logical_addr);
> > + if (status)
> > + return status;
> > +
> > + /* Re-enable device */
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1,
> > + enable_val | SECOCEC_ENABLE_REG_1_CEC);
> > + if (status)
> > + return status;
> > +
> > + return 0;
> > +}
> > +
> > +static int secocec_adap_transmit(struct cec_adapter *adap, u8 attempts,
> > + u32 signal_free_time, struct cec_msg *msg)
> > +{
> > + struct secocec_data *cec = cec_get_drvdata(adap);
> > + struct device *dev = cec->dev;
> > + u16 payload_len, payload_id_len, destination, val = 0;
> > + u8 *payload_msg;
> > + int status;
> > + u8 i;
> > +
> > + /* Device msg len already accounts for header */
> > + payload_id_len = msg->len - 1;
> > +
> > + /* Send data length */
> > + status = smb_wr16(SECOCEC_WRITE_DATA_LENGTH, payload_id_len);
> > + if (status)
> > + goto err;
> > +
> > + /* Send Operation ID if present */
> > + if (payload_id_len > 0) {
> > + status = smb_wr16(SECOCEC_WRITE_OPERATION_ID, msg->msg[1]);
> > + if (status)
> > + goto err;
> > + }
> > + /* Send data if present */
> > + if (payload_id_len > 1) {
> > + /* Only data; */
> > + payload_len = msg->len - 2;
> > + payload_msg = &msg->msg[2];
> > +
> > + /* Copy message into registers */
> > + for (i = 0; i < payload_len / 2 + payload_len % 2; i++) {
> > + /* hi byte */
> > + val = payload_msg[(i << 1) + 1] << 8;
> > +
> > + /* lo byte */
> > + val |= payload_msg[(i << 1)];
> > +
> > + status = smb_wr16(SECOCEC_WRITE_DATA_00 + i, val);
> > + if (status)
> > + goto err;
> > + }
> > + }
> > + /* Send msg source/destination and fire msg */
> > + destination = msg->msg[0];
> > + status = smb_wr16(SECOCEC_WRITE_BYTE0, destination);
> > + if (status)
> > + goto err;
> > +
> > + return 0;
> > +
> > +err:
> > + dev_err(dev, "Transmit failed (%d)", status);
> > + return status;
> > +}
> > +
> > +static int secocec_tx_done(struct cec_adapter *adap, u16 status_val)
> > +{
> > + int status = 0;
> > +
> > + if (status_val & SECOCEC_STATUS_TX_ERROR_MASK) {
> > + if (status_val & SECOCEC_STATUS_TX_NACK_ERROR) {
> > + cec_transmit_attempt_done(adap, CEC_TX_STATUS_NACK);
> > + status = -EAGAIN;
> > + } else {
> > + cec_transmit_attempt_done(adap, CEC_TX_STATUS_ERROR);
> > + status = -EIO;
> > + }
> > + } else {
> > + cec_transmit_attempt_done(adap, CEC_TX_STATUS_OK);
> > + }
> > +
> > + /* Reset status reg */
> > + status_val = SECOCEC_STATUS_TX_ERROR_MASK |
> > + SECOCEC_STATUS_MSG_SENT_MASK |
> > + SECOCEC_STATUS_TX_NACK_ERROR;
> > + smb_wr16(SECOCEC_STATUS, status_val);
> > +
> > + return status;
> > +}
> > +
> > +static int secocec_rx_done(struct cec_adapter *adap, u16 status_val)
> > +{
> > + struct secocec_data *cec = cec_get_drvdata(adap);
> > + struct device *dev = cec->dev;
> > + struct cec_msg msg = { };
> > + bool flag_overflow = false;
> > + u8 payload_len, i = 0;
> > + u8 *payload_msg;
> > + u16 val = 0;
> > + int status;
> > +
> > + if (status_val & SECOCEC_STATUS_RX_OVERFLOW_MASK) {
> > + dev_warn(dev, "Received more than 16 bytes. Discarding");
> > + flag_overflow = true;
> > + }
> > +
> > + if (status_val & SECOCEC_STATUS_RX_ERROR_MASK) {
> > + dev_warn(dev, "Message received with errors. Discarding");
> > + status = -EIO;
> > + goto rxerr;
> > + }
> > +
> > + /* Read message length */
> > + status = smb_rd16(SECOCEC_READ_DATA_LENGTH, &val);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "Incoming message (payload len %d):", val);
> > +
> > + /* Device msg len already accounts for the header */
> > + msg.len = min(val + 1, CEC_MAX_MSG_SIZE);
> > +
> > + /* Read logical address */
> > + status = smb_rd16(SECOCEC_READ_BYTE0, &val);
> > + if (status)
> > + goto err;
> > +
> > + /* device stores source LA and destination */
> > + msg.msg[0] = val;
> > +
> > + /* Read operation ID if present */
> > + if (msg.len > 0) {
>
> Am I wrong or msg.len is at least (val + 1) and val is never negative?
> If that's true, this condition is always verified.
Good one, have to correct this.
>
> > + status = smb_rd16(SECOCEC_READ_OPERATION_ID, &val);
> > + if (status)
> > + goto err;
> > +
> > + msg.msg[1] = val;
> > + }
> > +
> > + /* Read data if present */
> > + if (msg.len > 1) {
> > + payload_len = msg.len - 2;
> > + payload_msg = &msg.msg[2];
> > +
> > + /* device stores 2 bytes in every 16-bit val */
> > + for (i = 0; i < payload_len / 2 + payload_len % 2; i++) {
> > + status = smb_rd16(SECOCEC_READ_DATA_00 + i, &val);
> > + if (status)
> > + goto err;
> > +
> > + /* low byte, skipping header */
> > + payload_msg[(i << 1)] = val & 0x00ff;
> > +
> > + /* hi byte */
> > + payload_msg[(i << 1) + 1] = (val & 0xff00) >> 8;
> > + }
> > + }
> > +
> > + cec_received_msg(cec->cec_adap, &msg);
> > +
> > + /* Reset status reg */
> > + status_val = SECOCEC_STATUS_MSG_RECEIVED_MASK;
> > + if (flag_overflow)
> > + status_val |= SECOCEC_STATUS_RX_OVERFLOW_MASK;
> > +
> > + status = smb_wr16(SECOCEC_STATUS, status_val);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "Message received successfully");
> > +
> > + return 0;
> > +
> > +rxerr:
> > + /* Reset error reg */
> > + status_val = SECOCEC_STATUS_MSG_RECEIVED_MASK |
> > + SECOCEC_STATUS_RX_ERROR_MASK;
> > + if (flag_overflow)
> > + status_val |= SECOCEC_STATUS_RX_OVERFLOW_MASK;
> > + smb_wr16(SECOCEC_STATUS, status_val);
> > +
> > +err:
> > + dev_err(dev, "Receive message failed (%d)", status);
> > + return status;
> > +}
> > +
> > +struct cec_adap_ops secocec_cec_adap_ops = {
> > + /* Low-level callbacks */
> > + .adap_enable = secocec_adap_enable,
> > + .adap_log_addr = secocec_adap_log_addr,
> > + .adap_transmit = secocec_adap_transmit,
> > +};
> > +
> > +static irqreturn_t secocec_irq_handler(int irq, void *priv)
> > +{
> > + struct secocec_data *cec = priv;
> > + struct device *dev = cec->dev;
> > + u16 status_val, cec_val, val = 0;
> > + int status;
> > +
> > + /* Read status register */
> > + status = smb_rd16(SECOCEC_STATUS_REG_1, &status_val);
> > + if (status)
> > + goto err;
> > +
> > + if (status_val & SECOCEC_STATUS_REG_1_CEC) {
> > + dev_dbg(dev, "+++++ CEC Interrupt Caught");
>
> Just be carefull in too much printouts while handling interrupts.
> Also, I would not insert custom printout formats (here and below in
> this functions). I would simply drop this one.
Yes, will drop.
>
> > +
> > + /* Read CEC status register */
> > + status = smb_rd16(SECOCEC_STATUS, &cec_val);
> > + if (status)
> > + goto err;
> > +
> > + if (cec_val & SECOCEC_STATUS_MSG_RECEIVED_MASK)
> > + secocec_rx_done(cec->cec_adap, cec_val);
> > +
> > + if (cec_val & SECOCEC_STATUS_MSG_SENT_MASK)
> > + secocec_tx_done(cec->cec_adap, cec_val);
> > +
> > + if ((~cec_val & SECOCEC_STATUS_MSG_SENT_MASK) &&
> > + (~cec_val & SECOCEC_STATUS_MSG_RECEIVED_MASK))
> > + dev_warn(dev,
> > + "Message not received or sent, but interrupt fired \\_\"._/");
>
> No custom funny printouts please :)
Ops. Left that :)
>
> > +
> > + val = SECOCEC_STATUS_REG_1_CEC;
> > + }
> > +
> > + if (status_val & SECOCEC_STATUS_REG_1_IR) {
> > + dev_dbg(dev, "IR RC5 Interrupt Caught");
>
> How frequent is this one? Do you need to print it out?
Not too frequent, but I wanted to see if and how many IR messages were handled
not in presence of RC commands. I would drop that too if not necessary.
>
> > + val |= SECOCEC_STATUS_REG_1_IR;
> > + /* TODO IRDA RX */
> > + }
> > +
> > + /* Reset status register */
> > + status = smb_wr16(SECOCEC_STATUS_REG_1, val);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "----- CEC Interrupt Handled");
>
> Drop this one please
>
> > +
> > + return IRQ_HANDLED;
> > +
> > +err:
> > + dev_err(dev, "IRQ: Read/Write SMBus operation failed (%d)", status);
> > +
> > + /* Reset status register */
> > + val = SECOCEC_STATUS_REG_1_CEC | SECOCEC_STATUS_REG_1_IR;
> > + smb_wr16(SECOCEC_STATUS_REG_1, val);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +struct cec_dmi_match {
> > + char *sys_vendor;
> > + char *product_name;
> > + char *devname;
> > + char *conn;
> > +};
> > +
> > +static const struct cec_dmi_match secocec_dmi_match_table[] = {
> > + /* UDOO X86 */
> > + { "SECO", "UDOO x86", "0000:00:02.0", "Port B" },
> > +};
> > +
> > +static int secocec_cec_get_notifier(struct cec_notifier **notify)
> > +{
> > + int i;
> > +
> > + for (i = 0 ; i < ARRAY_SIZE(secocec_dmi_match_table) ; ++i) {
> > + const struct cec_dmi_match *m = &secocec_dmi_match_table[i];
> > +
> > + if (dmi_match(DMI_SYS_VENDOR, m->sys_vendor) &&
> > + dmi_match(DMI_PRODUCT_NAME, m->product_name)) {
> > + struct device *d;
> > +
> > + /* Find the device, bail out if not yet registered */
> > + d = bus_find_device_by_name(&pci_bus_type, NULL,
> > + m->devname);
> > + if (!d)
> > + return -EPROBE_DEFER;
> > +
> > + *notify = cec_notifier_get_conn(d, m->conn);
>
> Nit: it's usually nice to have an empty line before return (here and in
> other places). Not mandatory though.
>
> > + return 0;
> > + }
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +
> > +static int secocec_acpi_probe(struct secocec_data *sdev)
> > +{
> > + struct device *dev = sdev->dev;
> > + struct gpio_desc *gpio;
> > + int irq = 0;
> > +
> > + gpio = devm_gpiod_get(dev, NULL, GPIOF_IN);
> > + if (IS_ERR(gpio)) {
> > + dev_err(dev, "Cannot request interrupt gpio");
> > + return PTR_ERR(gpio);
> > + }
> > +
> > + irq = gpiod_to_irq(gpio);
> > + if (irq < 0) {
> > + dev_err(dev, "Cannot find valid irq");
> > + return -ENODEV;
> > + }
> > + dev_dbg(dev, "irq-gpio is bound to IRQ %d", irq);
> > +
> > + sdev->irq = irq;
> > +
> > + return 0;
> > +}
> > +
> > +static int secocec_probe(struct platform_device *pdev)
> > +{
> > + struct secocec_data *secocec;
> > + struct device *dev = &pdev->dev;
> > + u8 cec_caps;
> > + int ret;
> > + u16 val;
> > +
> > + secocec = devm_kzalloc(dev, sizeof(*secocec), GFP_KERNEL);
> > + if (!secocec)
> > + return -ENOMEM;
> > +
> > + dev_set_drvdata(dev, secocec);
> > +
> > + /* Request SMBus regions */
> > + if (!request_muxed_region(BRA_SMB_BASE_ADDR, 7, "CEC00001")) {
> > + dev_err(dev, "Request memory region failed");
> > + return -ENXIO;
> > + }
> > +
> > + secocec->pdev = pdev;
> > + secocec->dev = dev;
> > +
> > + if (!has_acpi_companion(dev)) {
> > + dev_dbg(dev, "Cannot find any ACPI companion");
> > + ret = -ENODEV;
> > + goto err;
> > + }
> > +
> > + ret = secocec_acpi_probe(secocec);
> > + if (ret) {
> > + dev_err(dev, "Cannot assign gpio to IRQ");
> > + ret = -ENODEV;
> > + goto err;
> > + }
> > +
> > + dev_dbg(dev, "IRQ detected at %d", secocec->irq);
> > +
> > + /* Firmware version check */
> > + ret = smb_rd16(SECOCEC_VERSION, &val);
> > + if (ret) {
> > + dev_err(dev, "Cannot check fw version");
> > + goto err;
> > + }
> > + if (val < SECOCEC_LATEST_FW) {
> > + dev_err(dev, "CEC Firmware not supported (v.%04x). Use ver > v.%04x",
> > + val, SECOCEC_LATEST_FW);
> > + ret = -EINVAL;
> > + goto err;
> > + }
> > +
> > +#ifdef CONFIG_CEC_NOTIFIER
>
> Your Kconfig entry selects CEC_NOTIFIER.
>
> (I won't comment on the cec_notifier handling part, as I don't know
> much. I just see other drivers registering and getting the notifier
> using the cec_notifier_ functions, while it seems to me you don't.
> Maybe it's fine...)
Left there to add optional support or when compiling the module
out-of-tree. But without a proper Kconfig is useless. I agree.
>
> > + ret = secocec_cec_get_notifier(&secocec->notifier);
> > + if (ret) {
> > + dev_err(dev, "no CEC notifier available\n");
> > + goto err;
> > + }
> > +#endif
> > +
> > + ret = devm_request_threaded_irq(dev,
> > + secocec->irq,
> > + NULL,
> > + secocec_irq_handler,
> > + IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> > + dev_name(&pdev->dev), secocec);
> > +
> > + if (ret) {
> > + dev_err(dev, "Cannot request IRQ %d", secocec->irq);
> > + ret = -EIO;
> > + goto err;
> > + }
> > +
> > + /* Allocate CEC adapter */
> > + cec_caps = CEC_CAP_DEFAULTS;
> > +
> > + secocec->cec_adap = cec_allocate_adapter(&secocec_cec_adap_ops,
> > + secocec,
> > + dev_name(dev),
> > + cec_caps, SECOCEC_MAX_ADDRS);
> > +
> > + if (IS_ERR(secocec->cec_adap)) {
> > + ret = PTR_ERR(secocec->cec_adap);
> > + goto err;
> > + }
> > +
> > + ret = cec_register_adapter(secocec->cec_adap, dev);
> > + if (ret)
> > + goto err_delete_adapter;
> > +
> > + if (secocec->notifier)
> > + cec_register_cec_notifier(secocec->cec_adap, secocec->notifier);
> > +
> > + platform_set_drvdata(pdev, secocec);
> > +
> > + dev_dbg(dev, "Device registered");
> > +
> > + return ret;
> > +
> > +err_delete_adapter:
> > + cec_delete_adapter(secocec->cec_adap);
> > +err:
> > + dev_err(dev, "%s device probe failed\n", dev_name(dev));
> > +
> > + return ret;
> > +}
> > +
> > +/* ----------------------------------------------------------------------- */
> > +
> > +static int secocec_remove(struct platform_device *pdev)
> > +{
> > + struct secocec_data *secocec = platform_get_drvdata(pdev);
> > +
> > + cec_unregister_adapter(secocec->cec_adap);
> > +
> > + if (secocec->notifier)
> > + cec_notifier_put(secocec->notifier);
> > +
> > + release_region(BRA_SMB_BASE_ADDR, 7);
> > +
> > + dev_dbg(&pdev->dev, "CEC device removed");
> > +
> > + return 0;
> > +}
> > +
> > +/* ----------------------------------------------------------------------- */
> > +
> > +#ifdef CONFIG_PM_SLEEP
>
> I see CONFIG_PM_SLEEP is only selected if support for
> 'suspend'/'hibernate' is enabled. Is this what you want, or you should
> check for CONFIG_PM?
I was just inspired by the implementation of cros-ec-cec, but I think
this is right, because the device actually has suspend/hibernate states.
>
> > +static int secocec_suspend(struct device *dev)
> > +{
> > + u16 val;
> > + int status;
> > +
> > + dev_dbg(dev, "Device going to suspend, disabling");
> > +
> > + /* Clear the status register */
> > + status = smb_rd16(SECOCEC_STATUS_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_STATUS_REG_1, val);
> > + if (status)
> > + goto err;
> > +
> > + /* Disable the interrupts */
> > + status = smb_rd16(SECOCEC_ENABLE_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1, val &
> > + ~SECOCEC_ENABLE_REG_1_CEC & ~SECOCEC_ENABLE_REG_1_IR);
> > + if (status)
> > + goto err;
> > +
> > + return 0;
> > +
> > +err:
> > + dev_err(dev, "Suspend failed (err: %d)", status);
> > + return status;
> > +}
> > +
> > +static int secocec_resume(struct device *dev)
> > +{
> > + u16 val;
> > + int status;
> > +
> > + dev_dbg(dev, "Resuming device from suspend");
> > +
> > + /* Clear the status register */
> > + status = smb_rd16(SECOCEC_STATUS_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_STATUS_REG_1, val);
> > + if (status)
> > + goto err;
> > +
> > + /* Enable the interrupts */
> > + status = smb_rd16(SECOCEC_ENABLE_REG_1, &val);
> > + if (status)
> > + goto err;
> > +
> > + status = smb_wr16(SECOCEC_ENABLE_REG_1, val | SECOCEC_ENABLE_REG_1_CEC);
> > + if (status)
> > + goto err;
> > +
> > + dev_dbg(dev, "Device resumed from suspend");
> > +
> > + return 0;
> > +
> > +err:
> > + dev_err(dev, "Resume failed (err: %d)", status);
> > + return status;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(secocec_pm_ops, secocec_suspend, secocec_resume);
> > +#define SECOCEC_PM_OPS (&secocec_pm_ops)
> > +#else
> > +#define SECOCEC_PM_OPS NULL
> > +#endif
> > +
> > +#ifdef CONFIG_ACPI
> > +static const struct acpi_device_id secocec_acpi_match[] = {
> > + {"CEC00001", 0},
> > + {},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(acpi, secocec_acpi_match);
> > +#endif
> > +
> > +static struct platform_driver secocec_driver = {
> > + .driver = {
> > + .name = SECOCEC_DEV_NAME,
> > + .acpi_match_table = ACPI_PTR(secocec_acpi_match),
> > + .pm = SECOCEC_PM_OPS,
> > + },
> > + .probe = secocec_probe,
> > + .remove = secocec_remove,
> > +};
>
> As you can see most of my comments are nits or trivial things. I would
> wait for more feedbacks on the CEC and x86/SMbus part from others before
> sending v2 if I were you :)
>
> Thanks
> j
>
Many thanks, this is my first patch, so I need plenty of comments. :)
Ettore
>
> > +
> > +module_platform_driver(secocec_driver);
> > +
> > +MODULE_DESCRIPTION("SECO CEC X86 Driver");
> > +MODULE_AUTHOR("Ettore Chimenti <ek5.chimenti@...il.com>");
> > +MODULE_LICENSE("Dual BSD/GPL");
> > diff --git a/drivers/media/platform/seco-cec/seco-cec.h b/drivers/media/platform/seco-cec/seco-cec.h
> > new file mode 100644
> > index 000000000000..cc7f0cba8e9e
> > --- /dev/null
> > +++ b/drivers/media/platform/seco-cec/seco-cec.h
> > @@ -0,0 +1,132 @@
> > +/* SPDX-License-Identifier: GPL-2.0 AND BSD-3-Clause */
> > +/*
> > + *
> > + * SECO X86 Boards CEC register defines
> > + *
> > + * Author: Ettore Chimenti <ek5.chimenti@...il.com>
> > + * Copyright (C) 2018, SECO Srl.
> > + * Copyright (C) 2018, Aidilab Srl.
> > + *
> > + */
> > +
> > +#ifndef __SECO_CEC_H__
> > +#define __SECO_CEC_H__
> > +
> > +#define SECOCEC_MAX_ADDRS 1
> > +#define SECOCEC_DEV_NAME "secocec"
> > +#define SECOCEC_LATEST_FW 0x0f0b
> > +
> > +#define SMBTIMEOUT 0xffff
> > +#define SMB_POLL_UDELAY 10
> > +
> > +#define SMBUS_WRITE 0
> > +#define SMBUS_READ 1
> > +
> > +#define CMD_BYTE_DATA 0
> > +#define CMD_WORD_DATA 1
> > +
> > +/*
> > + * SMBus definitons for Braswell
> > + */
> > +
> > +#define BRA_DONE_STATUS BIT(7)
> > +#define BRA_INUSE_STS BIT(6)
> > +#define BRA_FAILED_OP BIT(4)
> > +#define BRA_BUS_ERR BIT(3)
> > +#define BRA_DEV_ERR BIT(2)
> > +#define BRA_INTR BIT(1)
> > +#define BRA_HOST_BUSY BIT(0)
> > +#define BRA_HSTS_ERR_MASK (BRA_FAILED_OP | BRA_BUS_ERR | BRA_DEV_ERR)
> > +
> > +#define BRA_PEC_EN BIT(7)
> > +#define BRA_START BIT(6)
> > +#define BRA_LAST__BYTE BIT(5)
> > +#define BRA_INTREN BIT(0)
> > +#define BRA_SMB_CMD (7 << 2)
> > +#define BRA_SMB_CMD_QUICK (0 << 2)
> > +#define BRA_SMB_CMD_BYTE (1 << 2)
> > +#define BRA_SMB_CMD_BYTE_DATA (2 << 2)
> > +#define BRA_SMB_CMD_WORD_DATA (3 << 2)
> > +#define BRA_SMB_CMD_PROCESS_CALL (4 << 2)
> > +#define BRA_SMB_CMD_BLOCK (5 << 2)
> > +#define BRA_SMB_CMD_I2CREAD (6 << 2)
> > +#define BRA_SMB_CMD_BLOCK_PROCESS (7 << 2)
> > +
> > +#define BRA_SMB_BASE_ADDR 0x2040
> > +#define HSTS (BRA_SMB_BASE_ADDR + 0)
> > +#define HCNT (BRA_SMB_BASE_ADDR + 2)
> > +#define HCMD (BRA_SMB_BASE_ADDR + 3)
> > +#define XMIT_SLVA (BRA_SMB_BASE_ADDR + 4)
> > +#define HDAT0 (BRA_SMB_BASE_ADDR + 5)
> > +#define HDAT1 (BRA_SMB_BASE_ADDR + 6)
> > +
> > +/*
> > + * Microcontroller Address
> > + */
> > +
> > +#define SECOCEC_MICRO_ADDRESS 0x40
> > +
> > +/*
> > + * STM32 SMBus Registers
> > + */
> > +
> > +#define SECOCEC_VERSION 0x00
> > +#define SECOCEC_ENABLE_REG_1 0x01
> > +#define SECOCEC_ENABLE_REG_2 0x02
> > +#define SECOCEC_STATUS_REG_1 0x03
> > +#define SECOCEC_STATUS_REG_2 0x04
> > +
> > +#define SECOCEC_STATUS 0x28
> > +#define SECOCEC_DEVICE_LA 0x29
> > +#define SECOCEC_READ_OPERATION_ID 0x2a
> > +#define SECOCEC_READ_DATA_LENGTH 0x2b
> > +#define SECOCEC_READ_DATA_00 0x2c
> > +#define SECOCEC_READ_DATA_02 0x2d
> > +#define SECOCEC_READ_DATA_04 0x2e
> > +#define SECOCEC_READ_DATA_06 0x2f
> > +#define SECOCEC_READ_DATA_08 0x30
> > +#define SECOCEC_READ_DATA_10 0x31
> > +#define SECOCEC_READ_DATA_12 0x32
> > +#define SECOCEC_READ_BYTE0 0x33
> > +#define SECOCEC_WRITE_OPERATION_ID 0x34
> > +#define SECOCEC_WRITE_DATA_LENGTH 0x35
> > +#define SECOCEC_WRITE_DATA_00 0x36
> > +#define SECOCEC_WRITE_DATA_02 0x37
> > +#define SECOCEC_WRITE_DATA_04 0x38
> > +#define SECOCEC_WRITE_DATA_06 0x39
> > +#define SECOCEC_WRITE_DATA_08 0x3a
> > +#define SECOCEC_WRITE_DATA_10 0x3b
> > +#define SECOCEC_WRITE_DATA_12 0x3c
> > +#define SECOCEC_WRITE_BYTE0 0x3d
> > +
> > +#define SECOCEC_IR_READ_DATA 0x3e
> > +
> > +/*
> > + * Enabling register
> > + */
> > +
> > +#define SECOCEC_ENABLE_REG_1_CEC 0x1000
> > +#define SECOCEC_ENABLE_REG_1_IR 0x2000
> > +#define SECOCEC_ENABLE_REG_1_IR_PASSTHROUGH 0x4000
> > +
> > +/*
> > + * Status register
> > + */
> > +
> > +#define SECOCEC_STATUS_REG_1_CEC SECOCEC_ENABLE_REG_1_CEC
> > +#define SECOCEC_STATUS_REG_1_IR SECOCEC_ENABLE_REG_1_IR
> > +#define SECOCEC_STATUS_REG_1_IR_PASSTHR SECOCEC_ENABLE_REG_1_IR_PASSTHR
> > +
> > +/*
> > + * Status data
> > + */
> > +
> > +#define SECOCEC_STATUS_MSG_RECEIVED_MASK BIT(0)
> > +#define SECOCEC_STATUS_RX_ERROR_MASK BIT(1)
> > +#define SECOCEC_STATUS_MSG_SENT_MASK BIT(2)
> > +#define SECOCEC_STATUS_TX_ERROR_MASK BIT(3)
> > +
> > +#define SECOCEC_STATUS_TX_NACK_ERROR BIT(4)
> > +#define SECOCEC_STATUS_RX_OVERFLOW_MASK BIT(5)
> > +
> > +#endif /* __SECO_CEC_H__ */
> > --
> > 2.18.0
> >
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