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SubjectRe: [PATCH 1/2] media: add SECO cec driver
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@gmail.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@gmail.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@lists.sourceforge.net (subscribers-only)
> S: Maintained
> F: drivers/mmc/host/sdricoh_cs.c
>
> +SECO BOARDS CEC DRIVER
> +M: Ettore Chimenti <ek5.chimenti@gmail.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@chromium.org>
> R: Andy Lutomirski <luto@amacapital.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)

> 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

> 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

> +/*
> + *
Nit: empty comment line
> + * CEC driver for SECO X86 Boards
> + *
> + * Author: Ettore Chimenti <ek5.chimenti@gmail.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

> +
> +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.

> + }
> +
> + 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.

> + 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.

> +
> + /* 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 :)

> +
> + 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?

> + 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...)

> + 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?

> +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


> +
> +module_platform_driver(secocec_driver);
> +
> +MODULE_DESCRIPTION("SECO CEC X86 Driver");
> +MODULE_AUTHOR("Ettore Chimenti <ek5.chimenti@gmail.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@gmail.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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