Hi Ilya,
> Introduce the device tree enumerated Broadcom Bluetooth UART driver.
>
> Signed-off-by: Ilya Faenson <ifaenson@xxxxxxxxxxxx>
> ---
> drivers/bluetooth/Kconfig | 9 +
> drivers/bluetooth/Makefile | 1 +
> drivers/bluetooth/btbcm_uart.c | 673 +++++++++++++++++++++++++++++++++++++++++
> drivers/bluetooth/btbcm_uart.h | 89 ++++++
> 4 files changed, 772 insertions(+)
> create mode 100644 drivers/bluetooth/btbcm_uart.c
> create mode 100644 drivers/bluetooth/btbcm_uart.h
>
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 2e77707..5eee3ed 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -143,6 +143,7 @@ config BT_HCIUART_BCM
> bool "Broadcom protocol support"
> depends on BT_HCIUART
> select BT_HCIUART_H4
> + select BT_UART_BCM
> select BT_BCM
> help
> The Broadcom protocol support enables Bluetooth HCI over serial
> @@ -150,6 +151,14 @@ config BT_HCIUART_BCM
>
> Say Y here to compile support for Broadcom protocol.
>
> +config BT_UART_BCM
if we follow our new naming that we have pushed since a few years now for new modules, then this should be BT_BCM_UART actually.
> + tristate "Broadcom BT UART driver"
> + depends on BT_HCIUART_H4 && TTY
So I am thinking that we do not even make this an user visible option. This should be just automatically selected from BT_HCIUART_BCM and that is it.
Meaning this is will be enough in the end:
config BT_BCM_UART
tristate
And I would just put it directly under the BT_BCM entry we already have.
> + help
> + This driver supports the HCI_UART_BT protocol.
> +
> + It manages Bluetooth UART device properties and GPIOs.
> +
This is something we have to figure out from a design point of view. Do we want to keep this as a separate module or not. My initial thinking here is that the platform driver should be just registered from bcm_init in hci_bcm.c.
I mean wouldn't it be a lot simpler if we can match up the BT HCI UART bcm_proto driver to the platform driver? I have no objection to make this a separate module, but I want to make sure that we looked at these two options.
If we ever get to UART slave drivers, then this would be essentially the UART slave driver, correct?
> config BT_HCIBCM203X
> tristate "HCI BCM203x USB driver"
> depends on USB
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index f40e194..e908a88 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_BT_MRVL) += btmrvl.o
> obj-$(CONFIG_BT_MRVL_SDIO) += btmrvl_sdio.o
> obj-$(CONFIG_BT_WILINK) += btwilink.o
> obj-$(CONFIG_BT_BCM) += btbcm.o
> +obj-$(CONFIG_BT_UART_BCM) += btbcm_uart.o
> obj-$(CONFIG_BT_RTL) += btrtl.o
>
> btmrvl-y := btmrvl_main.o
> diff --git a/drivers/bluetooth/btbcm_uart.c b/drivers/bluetooth/btbcm_uart.c
> new file mode 100644
> index 0000000..ccd02a9
> --- /dev/null
> +++ b/drivers/bluetooth/btbcm_uart.c
> @@ -0,0 +1,673 @@
> +/*
> + * Bluetooth BCM UART Driver
> + *
> + * Copyright (c) 2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/module.h>
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/fcntl.h>
> +#include <linux/interrupt.h>
> +#include <linux/ptrace.h>
> +#include <linux/poll.h>
> +
> +#include <linux/slab.h>
> +#include <linux/tty.h>
> +#include <linux/errno.h>
> +#include <linux/string.h>
> +#include <linux/signal.h>
> +#include <linux/ioctl.h>
> +#include <linux/skbuff.h>
> +#include <linux/list.h>
> +
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_platform.h>
> +
> +#include "btbcm_uart.h"
> +
> +static int idle_timeout = 5;
> +module_param(idle_timeout, int, 0);
> +MODULE_PARM_DESC(idle_timeout, "Bluetooth idle timeout in seconds");
I wonder if this isn't a debugfs option? I have told Marvell that some of their additions might be better served as debugfs option. So for example hooked up under /sys/kernel/debug/bluetooth/hci0/bcm_xx for example.
Not sure if this is easy to do or even if this is something static, then it should be a DT entry.
> +
> +/* Device context */
> +struct bcm_device {
> + struct list_head list;
> +
> + struct platform_device *pdev;
> + struct gpio_desc *bt_wake_gpio;
> + struct gpio_desc *dev_wake_gpio;
> + struct gpio_desc *reg_on_gpio;
> + int bt_wake_irq;
> + int dev_wake_active_low;
> + int reg_on_active_low;
> + int bt_wake_active_low;
> + bool configure_sleep;
> + u32 manual_fc;
> + u32 oper_speed;
> + bool configure_audio;
> + u32 pcm_clockmode;
> + u32 pcm_fillmethod;
> + u32 pcm_fillnum;
> + u32 pcm_fillvalue;
> + u32 pcm_incallbitclock;
> + u32 pcm_lsbfirst;
> + u32 pcm_rightjustify;
> + u32 pcm_routing;
> + u32 pcm_shortframesync;
> + u32 pcm_syncmode;
> +
> + char tty_name[64];
> +
> + struct btbcm_uart_callbacks protocol_callbacks;
> + struct work_struct wakeup_work;
> +};
> +
> +/* List of BCM BT UART devices */
> +static DEFINE_SPINLOCK(device_list_lock);
> +static LIST_HEAD(device_list);
> +
> +/*
> + * Calling the BCM protocol at lower execution priority
> + */
Please follow network subsystem coding style rules for comments.
> +static void bcm_bt_wakeup_task(struct work_struct *ws)
Instead of *ws, lets use *work here to be a bit more consistent on how the Bluetooth subsystem labels them.
> +{
> + int gpio_value;
> + struct bcm_device *p_bcm_device =
> + container_of(ws, struct bcm_device, wakeup_work);
As a more generic rule, have the struct with the assignment from the "user data" as the first one.
Also p_bcm_device is something we generally do not do. The p_ for as in pointer is not really our style. So I work short it to just *dev here.
> +
> + if (!p_bcm_device) {
> + BT_DBG("%s - failing, no device", __func__);
Lets avoid __func__ and rely on dynamic debug feature.
> + return;
> + }
> +
> + /* Make sure the device is resumed */
> + gpio_value = !p_bcm_device->dev_wake_active_low;
> + if (p_bcm_device->dev_wake_gpio) {
The variable declaration of gpio_value and it assignment can go here.
> + gpiod_set_value(p_bcm_device->dev_wake_gpio, gpio_value);
> + BT_DBG("%s - resume %d written, delaying 15 ms",
> + __func__, gpio_value);
> + mdelay(15);
> + }
> +
> + /* Let the protocol know it's time to wake up */
> + if (p_bcm_device->protocol_callbacks.p_wakeup)
> + p_bcm_device->protocol_callbacks.p_wakeup(
> + p_bcm_device->protocol_callbacks.context);
> +}
> +
> +/*
> + * Interrupt routine for the wake from the device
> + */
> +static irqreturn_t bcm_bt_uart_isr(int irq, void *context)
> +{
> + unsigned int bt_wake;
> + struct bcm_device *p = (struct bcm_device *)context;
> +
> + bt_wake = gpiod_get_value(p->bt_wake_gpio);
> + BT_DBG("%s with bt_wake of %d (active_low %d), req bh",
> + __func__, bt_wake, p->bt_wake_active_low);
> +
> + /* Defer the actual processing to the platform work queue */
> + schedule_work(&p->wakeup_work);
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * Device instance startup
> + */
> +static int bcm_bt_uart_probe(struct platform_device *pdev)
> +{
> + int ret = 0;
Please only assign variables to zero only if that is needed and there is no other way.
> + struct device_node *np = pdev->dev.of_node;
> + const char *tty_name;
> + struct bcm_device *p_bcm_device = NULL;
No point to assign to NULL if you assign anyway. Please remove these.
> +
> + p_bcm_device = devm_kzalloc(&pdev->dev, sizeof(*p_bcm_device),
> + GFP_KERNEL);
Please use proper alignment when calls break into multiple lines.
> + if (!p_bcm_device) {
> + BT_DBG("%s - failing due to no memory", __func__);
> + return -ENOMEM;
> + }
There should be an empty line here. Indicated a logical break if you leave the function is a good idea.
> + p_bcm_device->pdev = pdev;
> + BT_DBG("%s %p context", __func__, p_bcm_device);
> +
> + /* Get dev wake GPIO */
> + p_bcm_device->dev_wake_gpio = gpiod_get(&pdev->dev, "bt-wake");
> + BT_DBG("%s - gpiod_get for bt-wake returned %p",
> + __func__, p_bcm_device->dev_wake_gpio);
I get the feeling that we have a little bit too much BT_DBG. Especially if you print errors later on anyway. Keep in mind that a lot of distribution will have dynamic debug enabled. So going crazy with BT_DBG is not a good idea.
> + if (IS_ERR(p_bcm_device->dev_wake_gpio)) {
> + ret = PTR_ERR(p_bcm_device->dev_wake_gpio);
> + if (ret != -ENOENT) {
> + dev_err(&pdev->dev,
> + "%s - dev_wake GPIO: %d\n", __func__, ret);
> + }
Single calls do not require { }.
> + p_bcm_device->dev_wake_gpio = NULL;
> + } else {
> + int gpio_value;
> +
> + p_bcm_device->dev_wake_active_low = gpiod_is_active_low
> + (p_bcm_device->dev_wake_gpio);
> + BT_DBG("%s - dev_wake a-low is %d (cans %d)",
> + __func__, p_bcm_device->dev_wake_active_low,
> + gpiod_cansleep(p_bcm_device->dev_wake_gpio));
> +
> + /* configure dev_wake as output with init resumed state */
> + gpio_value = !p_bcm_device->dev_wake_active_low;
> + ret = gpiod_direction_output(p_bcm_device->dev_wake_gpio,
> + gpio_value);
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "%s s dev_wake GPIO: %d\n", __func__, ret);
> + gpiod_put(p_bcm_device->dev_wake_gpio);
> + p_bcm_device->dev_wake_gpio = NULL;
> + goto end;
> + } else {
> + BT_DBG("%s - dev_wake set to %d", __func__,
> + gpio_value);
> + }
> + }
> +
> + /* Get power on/off GPIO */
> + p_bcm_device->reg_on_gpio = gpiod_get(&pdev->dev, "bt-reg-on");
> + BT_DBG("%s - gpiod_get for bt-reg-on returned %p", __func__,
> + p_bcm_device->reg_on_gpio);
> + if (IS_ERR(p_bcm_device->reg_on_gpio)) {
> + ret = PTR_ERR(p_bcm_device->reg_on_gpio);
> + if (ret != -ENOENT) {
> + dev_err(&pdev->dev,
> + "%s - reg_on GPIO: %d\n", __func__, ret);
> + }
> + p_bcm_device->reg_on_gpio = NULL;
> + } else {
> + int poweron_flag;
> +
> + p_bcm_device->reg_on_active_low = gpiod_is_active_low
> + (p_bcm_device->reg_on_gpio);
> + BT_DBG("%s - reg_on a-low is %d (cans %d)",
> + __func__, p_bcm_device->reg_on_active_low,
> + gpiod_cansleep(p_bcm_device->reg_on_gpio));
> +
> + /* configure reg_on as output with init on state */
> + poweron_flag = !p_bcm_device->reg_on_active_low;
> + ret = gpiod_direction_output(p_bcm_device->reg_on_gpio,
> + poweron_flag);
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "%s set reg_on GPIO: %d\n", __func__, ret);
> + gpiod_put(p_bcm_device->reg_on_gpio);
> + p_bcm_device->reg_on_gpio = NULL;
> + } else {
> + BT_DBG("%s - reg_on initially set to %d", __func__,
> + poweron_flag);
> + }
> + }
> +
> + platform_set_drvdata(pdev, p_bcm_device);
> + /* Must be done before interrupt is requested */
> + INIT_WORK(&p_bcm_device->wakeup_work, bcm_bt_wakeup_task);
> +
> + /* Get bt host wake GPIO */
> + p_bcm_device->bt_wake_gpio = gpiod_get(&pdev->dev, "bt-host-wake");
> + BT_DBG("%s - gpiod_get for bt-host-wake returned %p", __func__,
> + p_bcm_device->bt_wake_gpio);
> + if (IS_ERR(p_bcm_device->bt_wake_gpio)) {
> + ret = PTR_ERR(p_bcm_device->bt_wake_gpio);
> + if (ret != -ENOENT) {
> + dev_err(&pdev->dev,
> + "%s - bt_wake GPIO: %d\n", __func__, ret);
> + }
> + p_bcm_device->bt_wake_gpio = NULL;
> + } else {
> + /* configure bt_wake as input */
> + ret = gpiod_direction_input(p_bcm_device->bt_wake_gpio);
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "%s set bt_wake GPIO: %d\n", __func__, ret);
> + gpiod_put(p_bcm_device->bt_wake_gpio);
> + p_bcm_device->bt_wake_gpio = NULL;
> + } else {
> + p_bcm_device->bt_wake_active_low = gpiod_is_active_low
> + (p_bcm_device->bt_wake_gpio);
> + BT_DBG("%s -bt_wake a-low is %d(cans%d)",
> + __func__, p_bcm_device->bt_wake_active_low,
> + gpiod_cansleep(p_bcm_device->bt_wake_gpio));
> + p_bcm_device->bt_wake_irq = gpiod_to_irq
> + (p_bcm_device->bt_wake_gpio);
> + if (p_bcm_device->bt_wake_irq < 0) {
> + dev_err(&pdev->dev,
> + "%s - HOST_WAKE IRQ: %d\n", __func__, ret);
Please use proper alignment. If you run out of space, then consider restructuring this whole code. These many nested if statements are really bad since they make the code hard to understand.
One advice would be to actually leave the function or goto to a later step in case of errors. In this case that saves you one indentation.
Then } else if { is totally valid as well and I think that might save you a second one. Please work on making this readable so that my brain hurts less when trying to understand it ;)
> + } else {
> + unsigned long intflags = IRQF_TRIGGER_RISING;
> +
> + if (p_bcm_device->bt_wake_active_low)
> + intflags = IRQF_TRIGGER_FALLING;
> +
> + ret = request_irq(p_bcm_device->bt_wake_irq,
> + bcm_bt_uart_isr,
> + intflags, "bt_host_wake",
> + p_bcm_device);
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "%s - failed IRQ %d: %d",
> + __func__,
> + p_bcm_device->bt_wake_irq, ret);
> + } else {
> + BT_DBG("%s - IRQ %d", __func__,
> + p_bcm_device->bt_wake_irq);
> + }
> + }
> + }
> + }
> +
> + p_bcm_device->configure_sleep = of_property_read_bool(
> + np, "configure-sleep");
I do not know what the right indentation is here, but it is not this one. Might want to check how other parts of the network subsystem deal with this.
> + BT_DBG("configure-sleep read as %d", p_bcm_device->configure_sleep);
> + p_bcm_device->manual_fc = 0;
> + if (!of_property_read_u32(np, "manual-fc",
> + &p_bcm_device->manual_fc)) {
> + BT_DBG("manual-fc read as %d",
> + p_bcm_device->manual_fc);
> + }
> + p_bcm_device->oper_speed = 3000000;
> + if (!of_property_read_u32(
> + np, "oper-speed",
> + &p_bcm_device->oper_speed)) {
> + BT_DBG("oper-speed read as %d",
> + p_bcm_device->oper_speed);
Here the code and test have the same indentation. That is not acceptable at all.
> + }
> + p_bcm_device->configure_audio = of_property_read_bool(
> + np, "configure-audio");
> + BT_DBG("configure-audio read as %d", p_bcm_device->configure_audio);
> + if (p_bcm_device->configure_audio) {
> + /* Defaults for audio */
> + p_bcm_device->pcm_clockmode = 0;
> + p_bcm_device->pcm_fillmethod = 2;
> + p_bcm_device->pcm_fillnum = 0;
> + p_bcm_device->pcm_fillvalue = 3;
> + p_bcm_device->pcm_incallbitclock = 0;
> + p_bcm_device->pcm_lsbfirst = 0;
> + p_bcm_device->pcm_rightjustify = 0;
> + p_bcm_device->pcm_routing = 0;
> + p_bcm_device->pcm_shortframesync = 0;
> + p_bcm_device->pcm_syncmode = 0;
> +
> + if (!of_property_read_u32(np, "pcm-clockmode",
> + &p_bcm_device->pcm_clockmode))
> + BT_DBG("pcm-clockmode read as %d",
> + p_bcm_device->pcm_clockmode);
> + if (!of_property_read_u32(np, "pcm-fillmethod",
> + &p_bcm_device->pcm_fillmethod))
> + BT_DBG("pcm-fillmethod readas %d",
> + p_bcm_device->pcm_fillmethod);
> + if (!of_property_read_u32(np, "pcm-fillnum",
> + &p_bcm_device->pcm_fillnum))
> + BT_DBG("pcm-fillnum read as %d",
> + p_bcm_device->pcm_fillnum);
> + if (!of_property_read_u32(np, "pcm-fillvalue",
> + &p_bcm_device->pcm_fillvalue))
> + BT_DBG("pcm-fillvalue read as %d",
> + p_bcm_device->pcm_fillvalue);
> + if (!of_property_read_u32(np, "pcm-incallbitclock",
> + &p_bcm_device->pcm_incallbitclock))
> + BT_DBG("pcm-incallbitclock read as %d",
> + p_bcm_device->pcm_incallbitclock);
> + if (!of_property_read_u32(np, "pcm-lsbfirst",
> + &p_bcm_device->pcm_lsbfirst))
> + BT_DBG("pcm-lsbfirst read as %d",
> + p_bcm_device->pcm_lsbfirst);
> + if (!of_property_read_u32(np, "pcm-rightjustify",
> + &p_bcm_device->pcm_rightjustify))
> + BT_DBG("pcm-rightjustify read as %d",
> + p_bcm_device->pcm_rightjustify);
> + if (!of_property_read_u32(np, "pcm-routing",
> + &p_bcm_device->pcm_routing))
> + BT_DBG("pcm-routing read as %d",
> + p_bcm_device->pcm_routing);
> + if (!of_property_read_u32(np, "pcm-shortframesync",
> + &p_bcm_device->pcm_shortframesync))
> + BT_DBG("pcm-shortframesync read as %d",
> + p_bcm_device->pcm_shortframesync);
> + if (!of_property_read_u32(np, "pcm-syncmode",
> + &p_bcm_device->pcm_syncmode))
> + BT_DBG("pcm-syncmode read as %d",
> + p_bcm_device->pcm_syncmode);
I wonder if the BT_DBG are all needed here. I mean one debug statement on what we are going to use is better. If someone ends up trying to debug this, then they can go and look at their DT.
> + }
> +
> + if (!of_property_read_string(np, "tty", &tty_name)) {
> + strcpy(p_bcm_device->tty_name, tty_name);
> + BT_DBG("tty name read as %s", p_bcm_device->tty_name);
> + }
> +
> + BT_DBG("idle_timeout set as %d", idle_timeout);
> +
> + ret = 0; /* If we made it here, we're fine */
> +
> + /* Place this instance on the device list */
> + spin_lock(&device_list_lock);
> + list_add_tail(&p_bcm_device->list, &device_list);
> + spin_unlock(&device_list_lock);
> +
> +end:
> + if (ret) {
> + if (p_bcm_device->reg_on_gpio) {
> + gpiod_put(p_bcm_device->reg_on_gpio);
> + p_bcm_device->reg_on_gpio = NULL;
> + }
> + if (p_bcm_device->bt_wake_gpio) {
> + gpiod_put(p_bcm_device->bt_wake_gpio);
> + p_bcm_device->bt_wake_gpio = NULL;
> + }
> + if (p_bcm_device->dev_wake_gpio) {
> + gpiod_put(p_bcm_device->dev_wake_gpio);
> + p_bcm_device->dev_wake_gpio = NULL;
> + }
> + }
> +
> + BT_DBG("%s with the result %d", __func__, ret);
> + return ret;
> +}
> +
> +/*
> + * Device instance removal
> + */
> +static int bcm_bt_uart_remove(struct platform_device *pdev)
> +{
> + struct bcm_device *p_bcm_device = platform_get_drvdata(pdev);
> +
> + if (p_bcm_device == NULL) {
General preference is !pointer here.
> + BT_DBG("%s - logic error, no probe?!", __func__);
> + return 0;
> + }
> +
> + BT_DBG("%s %p context", __func__, p_bcm_device);
> +
> + spin_lock(&device_list_lock);
> + list_del(&p_bcm_device->list);
> + spin_unlock(&device_list_lock);
> +
> + BT_DBG("%s - freeing interrupt %d", __func__,
> + p_bcm_device->bt_wake_irq);
> + free_irq(p_bcm_device->bt_wake_irq, p_bcm_device);
> +
> + if (p_bcm_device->reg_on_gpio) {
> + BT_DBG("%s - releasing reg_on_gpio", __func__);
> + gpiod_put(p_bcm_device->reg_on_gpio);
> + p_bcm_device->reg_on_gpio = NULL;
> + }
> +
> + if (p_bcm_device->dev_wake_gpio) {
> + BT_DBG("%s - releasing dev_wake_gpio", __func__);
> + gpiod_put(p_bcm_device->dev_wake_gpio);
> + p_bcm_device->dev_wake_gpio = NULL;
> + }
> +
> + if (p_bcm_device->bt_wake_gpio) {
> + BT_DBG("%s - releasing bt_wake_gpio", __func__);
> + gpiod_put(p_bcm_device->bt_wake_gpio);
> + p_bcm_device->bt_wake_gpio = NULL;
> + }
> +
> + BT_DBG("%s %p done", __func__, p_bcm_device);
> + return 0;
> +}
> +
> +/*
> + * Platform resume callback
> + */
> +static int bcm_bt_uart_resume(struct device *pdev)
> +{
> + int gpio_value;
> + struct bcm_device *p_bcm_device = platform_get_drvdata(
> + to_platform_device(pdev));
> +
> + if (p_bcm_device == NULL) {
> + BT_DBG("%s - logic error, no device?!", __func__);
> + return 0;
> + }
> +
> + BT_DBG("%s %p", __func__, p_bcm_device);
> +
> + gpio_value = !p_bcm_device->dev_wake_active_low;
> + if (p_bcm_device->dev_wake_gpio) {
> + gpiod_set_value(p_bcm_device->dev_wake_gpio, gpio_value);
> + BT_DBG("%s - %d written, delaying 15 ms", __func__,
> + gpio_value);
> + mdelay(15);
> + }
> +
> + /* Let the protocol know the platform is resuming */
> + if (p_bcm_device->protocol_callbacks.p_resume)
> + p_bcm_device->protocol_callbacks.p_resume(
> + p_bcm_device->protocol_callbacks.context);
> +
> + return 0;
> +}
> +
> +/*
> + * Platform suspend callback
> + */
> +static int bcm_bt_uart_suspend(struct device *pdev)
> +{
> + int gpio_value;
> + struct bcm_device *p_bcm_device = platform_get_drvdata(
> + to_platform_device(pdev));
> +
> + if (p_bcm_device == NULL) {
> + BT_DBG("%s - logic error, no device?!", __func__);
> + return 0;
> + }
> +
> + BT_DBG("%s %p", __func__, p_bcm_device);
> +
> + /* Let the protocol know the platform is suspending */
> + if (p_bcm_device->protocol_callbacks.p_suspend)
> + p_bcm_device->protocol_callbacks.p_suspend(
> + p_bcm_device->protocol_callbacks.context);
> +
> + /* Suspend the device */
> + if (p_bcm_device->dev_wake_gpio) {
> + gpio_value = !!p_bcm_device->dev_wake_active_low;
> + gpiod_set_value(p_bcm_device->dev_wake_gpio, gpio_value);
> + BT_DBG("%s - %d written, delaying 15 ms", __func__,
> + gpio_value);
> + mdelay(15);
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Entry point for calls from the protocol
> + */
> +int btbcm_uart_control(int action, void *device_context,
> + void *p_data, unsigned long *p_size)
> +{
> + struct btbcm_uart_callbacks *pc;
> + struct btbcm_uart_parameters *pp = p_data; /* for pars action only */
> + int ret = 0;
> + int gpio_value, poweron_flag;
> + struct bcm_device *p_bcm_device = device_context;
> + struct list_head *ptr;
> + bool is_found = false;
> +
> + /* Special processing for the callback configuration */
> + if (action == BTBCM_UART_ACTION_CONFIGURE_CALLBACKS) {
> + pc = p_data;
> +
> + BT_DBG("%s - configure callbacks", __func__);
> + if (p_data == NULL || *p_size != sizeof(struct
> + btbcm_uart_callbacks) || (pc->interface_version !=
> + BTBCM_UART_INTERFACE_VERSION)) {
> + BT_DBG("%s - callbacks mismatch!", __func__);
> + return -E2BIG;
> + }
> +
> + BT_DBG("%s - configure callbacks for %s(%p)", __func__,
> + pc->name, pc->context);
> + if (p_bcm_device == NULL) {
> + spin_lock(&device_list_lock);
> + list_for_each(ptr, &device_list) {
> + p_bcm_device = list_entry(ptr, struct
> + bcm_device, list);
> + if (!strcmp(p_bcm_device->tty_name, pc->name)) {
> + is_found = true;
> + break;
> + }
> + }
> +
> + spin_unlock(&device_list_lock);
> + if (!is_found) {
> + BT_DBG("%s - no device!", __func__);
> + return -ENOENT;
> + }
> + }
> +
> + p_bcm_device->protocol_callbacks = *pc;
> + memcpy(p_data, &p_bcm_device, sizeof(p_bcm_device));
> + *p_size = sizeof(p_bcm_device);
> + return ret;
> + }
> +
> + /* All other requests must have the right context */
> + if (p_bcm_device == NULL) {
> + BT_DBG("%s - failing, no device", __func__);
> + return -ENOENT;
> + }
> +
> + switch (action) {
> + case BTBCM_UART_ACTION_POWER_ON:
> + BT_DBG("%s %p - power on", __func__, device_context);
> + if (p_bcm_device->reg_on_gpio) {
> + poweron_flag = !p_bcm_device->reg_on_active_low;
> + gpiod_set_value(p_bcm_device->reg_on_gpio,
> + poweron_flag);
> + BT_DBG("%s - pwron %d, delay 15 ms", __func__,
> + poweron_flag);
> + mdelay(15);
> + }
> + break;
> +
> + case BTBCM_UART_ACTION_POWER_OFF:
> + BT_DBG("%s %p - power off", __func__, device_context);
> + if (p_bcm_device->reg_on_gpio) {
> + poweron_flag = p_bcm_device->reg_on_active_low;
> + gpiod_set_value(p_bcm_device->reg_on_gpio,
> + poweron_flag);
> + BT_DBG("%s - pwroff %d, delay 15 ms", __func__,
> + poweron_flag);
> + mdelay(15);
> + }
> + break;
> +
> + case BTBCM_UART_ACTION_RESUME:
> + BT_DBG("%s %p - resume", __func__, device_context);
> + if (p_bcm_device->dev_wake_gpio) {
> + gpio_value = !p_bcm_device->dev_wake_active_low;
> + gpiod_set_value(p_bcm_device->dev_wake_gpio,
> + gpio_value);
> + BT_DBG("%s - resume %d, delay 15 ms", __func__,
> + gpio_value);
> + mdelay(15);
> + }
> + break;
> +
> + case BTBCM_UART_ACTION_SUSPEND:
> + BT_DBG("%s %p - suspend", __func__, device_context);
> + if (p_bcm_device->dev_wake_gpio) {
> + gpio_value = !!p_bcm_device->dev_wake_active_low;
> + gpiod_set_value(p_bcm_device->dev_wake_gpio,
> + gpio_value);
> + BT_DBG("btbcm_uart_control - suspend %d, delay 15ms",
> + gpio_value);
> + mdelay(15);
> + }
> + break;
> +
> + case BTBCM_UART_ACTION_GET_PARAMETERS:
> + BT_DBG("%s %p - get pars", __func__, device_context);
> + if ((p_data == NULL) ||
> + (*p_size < sizeof(struct btbcm_uart_parameters))) {
> + BT_DBG("%s - failing, wrong par size", __func__);
> + return -E2BIG;
> + }
> +
> + memset(pp, 0, sizeof(struct btbcm_uart_parameters));
> + pp->interface_version = BTBCM_UART_INTERFACE_VERSION;
> + pp->configure_sleep = p_bcm_device->configure_sleep;
> + pp->manual_fc = p_bcm_device->manual_fc;
> + pp->dev_wake_active_low = p_bcm_device->dev_wake_active_low;
> + pp->bt_wake_active_low = p_bcm_device->bt_wake_active_low;
> + pp->idle_timeout_in_secs = idle_timeout;
> + pp->oper_speed = p_bcm_device->oper_speed;
> + pp->configure_audio = p_bcm_device->configure_audio;
> + pp->pcm_clockmode = p_bcm_device->pcm_clockmode;
> + pp->pcm_fillmethod = p_bcm_device->pcm_fillmethod;
> + pp->pcm_fillnum = p_bcm_device->pcm_fillnum;
> + pp->pcm_fillvalue = p_bcm_device->pcm_fillvalue;
> + pp->pcm_incallbitclock = p_bcm_device->pcm_incallbitclock;
> + pp->pcm_lsbfirst = p_bcm_device->pcm_lsbfirst;
> + pp->pcm_rightjustify = p_bcm_device->pcm_rightjustify;
> + pp->pcm_routing = p_bcm_device->pcm_routing;
> + pp->pcm_shortframesync = p_bcm_device->pcm_shortframesync;
> + pp->pcm_syncmode = p_bcm_device->pcm_syncmode;
> + *p_size = sizeof(struct btbcm_uart_parameters);
> + break;
> +
> + default:
> + BT_DBG("%s %p unknown act %d", __func__,
> + device_context, action);
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(btbcm_uart_control);
I am not okay with having one bug exported symbol that does everything. This is the kernel and we can export each function individually. No need to have this massive single point of entry. So please split these out.
> +
> +/* Platform susp and resume callbacks */
> +static SIMPLE_DEV_PM_OPS(bcm_bt_uart_pm_ops,
I think bcm_uart_pm_ops is enough.
> + bcm_bt_uart_suspend, bcm_bt_uart_resume);
Alignment is wrong here.
> +
> +/* Driver match table */
> +static const struct of_device_id bcm_bt_uart_table[] = {
Remove the bt here. I think bcm_uart_table is enough.
> + { .compatible = "brcm,brcm-bt-uart" },
> + {}
> +};
> +
> +/* Driver configuration */
> +static struct platform_driver bcm_bt_uart_driver = {
Just call it bcm_uart_driver.
> + .probe = bcm_bt_uart_probe,
> + .remove = bcm_bt_uart_remove,
> + .driver = {
> + .name = "brcm_bt_uart",
Matching up with our naming, this should be "btbcm_uart" or "bt_bcm_uart".
> + .of_match_table = of_match_ptr(bcm_bt_uart_table),
> + .owner = THIS_MODULE,
> + .pm = &bcm_bt_uart_pm_ops,
> + },
> +};
In general it is .name<tab>=<space>value,
> +
> +module_platform_driver(bcm_bt_uart_driver);
> +
> +MODULE_AUTHOR("Ilya Faenson");
Preference is to include the email address in the author information.
> +MODULE_DESCRIPTION("Broadcom Bluetooth UART Driver");
> +MODULE_LICENSE("GPL");
> +
> diff --git a/drivers/bluetooth/btbcm_uart.h b/drivers/bluetooth/btbcm_uart.h
> new file mode 100644
> index 0000000..fbc7285
> --- /dev/null
> +++ b/drivers/bluetooth/btbcm_uart.h
> @@ -0,0 +1,89 @@
> +/*
> + * Bluetooth BCM UART Driver Header
> + *
> + * Copyright (c) 2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#ifndef BTBCM_UART_H
> +#define BTBCM_UART_H
Remove these since we do not do these includes guards for local includes in drivers/bluetooth/.
> +
> +/* Change the version if you change anything in this header */
> +#define BTBCM_UART_INTERFACE_VERSION 1
No idea why we need this. There is no external consumer of this. Please get rid of this.
> +/* Callbacks from the driver into the protocol */
> +typedef void (*p_suspend_callback)(void *context);
> +typedef void (*p_resume_callback)(void *context);
> +typedef void (*p_wakeup_callback)(void *context);
I do not see the need for these typedefs.
> +struct btbcm_uart_callbacks {
> + int interface_version; /* interface # compiled against */
Get rid of this.
> + void *context; /* protocol instance context */
> + char name[64]; /* protocol tty device, for example, ttyS0 */
> +
> + /* client callbacks */
> + p_suspend_callback p_suspend;
> + p_resume_callback p_resume;
> + p_wakeup_callback p_wakeup;
Just spell these out here.
> +};
> +
> +/* Driver parameters retrieved from the DT or ACPI */
> +struct btbcm_uart_parameters {
> + int interface_version; /* interface # compiled against */
Get rid of this as well.
> +
> + /* Parameters themselves */
> + bool configure_sleep;
> + int manual_fc;
> + int dev_wake_active_low;
> + int bt_wake_active_low;
> + int idle_timeout_in_secs;
> + int oper_speed;
> + bool configure_audio;
> + int pcm_clockmode;
> + int pcm_fillmethod;
> + int pcm_fillnum;
> + int pcm_fillvalue;
> + int pcm_incallbitclock;
> + int pcm_lsbfirst;
> + int pcm_rightjustify;
> + int pcm_routing;
> + int pcm_shortframesync;
> + int pcm_syncmode;
> +};
> +
> +/*
> + * Actions on the BTBCM_UART driver
> + */
> +
> +/* Configure protocol callbacks */
> +#define BTBCM_UART_ACTION_CONFIGURE_CALLBACKS 0
> +
> +/* Retrieve BT device parameters */
> +#define BTBCM_UART_ACTION_GET_PARAMETERS 1
> +
> +/* Resume the BT device via GPIO */
> +#define BTBCM_UART_ACTION_RESUME 2
> +
> +/* Suspend the BT device via GPIO */
> +#define BTBCM_UART_ACTION_SUSPEND 3
> +
> +/* Power the BT device off via GPIO */
> +#define BTBCM_UART_ACTION_POWER_OFF 4
> +
> +/* Power the BT device on via GPIO */
> +#define BTBCM_UART_ACTION_POWER_ON 5
> +
> +/* Execute an action on the BT device */
> +extern int btbcm_uart_control(int action, void *device_context,
> + void *p_data, unsigned long *p_size);
> +
> +#endif
Regards
Marcel
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