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SubjectRe: [PATCH] bluetooth: Add hci_h4p driver
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Hi Pavel,

> Add hci_h4p bluetooth driver. This device is used for example on Nokia N900 cell phone.

the driver is called nokia_h4p. And you could be a little bit more verbose here explaining where the driver came from.

>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>
> Thanks-to: Sebastian Reichel <sre@debian.org>
> Thanks-to: Joe Perches <joe@perches.com>
>
> ---
>
> Please apply,

If you refuse to use git check-patch, then manually include a diffstat.

>
> Pavel
>
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index 4547dc2..268b1a6 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -243,4 +243,13 @@ config BT_WILINK
> Say Y here to compile support for Texas Instrument's WiLink7 driver
> into the kernel or say M to compile it as module (btwilink).
>
> +config BT_NOKIA_H4P
> + tristate "HCI driver with H4 Nokia extensions"

Lets call this "Nokia H4+ Extensions (H4P) driver"

I prefer if the driver list looks at least a bit clean. So that vendor drivers that with the vendor name in their description.

> + help
> + Bluetooth HCI driver with H4 extensions. This driver provides
> + support for H4+ Bluetooth chip with vendor-specific H4 extensions.

Mention here that the current version supports the Broadcom based version found in the Nokia N900.

> +
> + Say Y here to compile support for h4 extended devices into the kernel
> + or say M to compile it as module (btnokia_h4p).

Module name is nokia_h4p

> +
> endmenu
> diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
> index 9fe8a87..624ef3fc 100644
> --- a/drivers/bluetooth/Makefile
> +++ b/drivers/bluetooth/Makefile
> @@ -31,4 +31,7 @@ hci_uart-$(CONFIG_BT_HCIUART_ATH3K) += hci_ath.o
> hci_uart-$(CONFIG_BT_HCIUART_3WIRE) += hci_h5.o
> hci_uart-objs := $(hci_uart-y)
>
> +obj-$(CONFIG_BT_NOKIA_H4P) += nokia_h4p.o

We use tabs and not spaces here.

Also add an extra empty line between the driver field and the list of objects.

> +nokia_h4p-objs := nokia_core.o nokia_fw.o nokia_uart.o
> +

And unless something changed in kbuild, this is nokia_h4p-y :=. Similar to all the other multi file drivers we have.

> ccflags-y += -D__CHECK_ENDIAN__
> diff --git a/drivers/bluetooth/nokia_core.c b/drivers/bluetooth/nokia_core.c
> new file mode 100644
> index 0000000..163531e
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_core.c
> @@ -0,0 +1,1188 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + * Thanks to all the Nokia people that helped with this driver,
> + * including Ville Tervo and Roger Quadros.
> + *
> + * Power saving functionality was removed from this driver to make
> + * merging easier.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/spinlock.h>
> +#include <linux/serial_reg.h>
> +#include <linux/skbuff.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_irq.h>
> +#include <linux/timer.h>
> +#include <linux/kthread.h>
> +#include <linux/io.h>
> +#include <linux/completion.h>
> +#include <linux/sizes.h>
> +
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +#include "nokia_h4p.h"
> +
> +#undef TEST

What is the TEST undef doing here?

> +
> +static int hw_inited = 0;
> +
> +/* This should be used in function that cannot release clocks */
> +static void h4p_set_clk(struct h4p_info *info, int *clock, int enable)

Lets start using bool enable here.

> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&info->clocks_lock, flags);
> + if (enable && !*clock) {
> + BT_DBG("Enabling %p", clock);
> + clk_prepare_enable(info->uart_fclk);
> + clk_prepare_enable(info->uart_iclk);
> + if (atomic_read(&info->clk_users) == 0)
> + h4p_restore_regs(info);
> + atomic_inc(&info->clk_users);
> + }
> +
> + if (!enable && *clock) {
> + BT_DBG("Disabling %p", clock);
> + if (atomic_dec_and_test(&info->clk_users))
> + h4p_store_regs(info);
> + clk_disable_unprepare(info->uart_fclk);
> + clk_disable_unprepare(info->uart_iclk);
> + }
> +
> + *clock = enable;
> + spin_unlock_irqrestore(&info->clocks_lock, flags);
> +}
> +
> +static void h4p_lazy_clock_release(unsigned long data)
> +{

What is the reason this is unsigned long and not just struct h4p_info?

> + struct h4p_info *info = (struct h4p_info *)data;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&info->lock, flags);
> + if (!info->tx_enabled)
> + h4p_set_clk(info, &info->tx_clocks_en, 0);
> + spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +/* Power management functions */
> +void h4p_smart_idle(struct h4p_info *info, bool enable)
> +{
> + u8 v;
> +
> + v = h4p_inb(info, UART_OMAP_SYSC);
> + v &= ~(UART_OMAP_SYSC_IDLEMASK);
> +
> + if (enable)
> + v |= UART_OMAP_SYSC_SMART_IDLE;
> + else
> + v |= UART_OMAP_SYSC_NO_IDLE;
> +
> + h4p_outb(info, UART_OMAP_SYSC, v);
> +}
> +
> +static inline void h4p_schedule_pm(struct h4p_info *info)
> +{
> +}
> +
> +static void h4p_disable_tx(struct h4p_info *info)
> +{
> + if (!info->pm_enabled)
> + return;
> +
> + /* Re-enable smart-idle */
> + h4p_smart_idle(info, 1);
> +
> + gpio_set_value(info->bt_wakeup_gpio, 0);
> + mod_timer(&info->lazy_release, jiffies + msecs_to_jiffies(100));

How many lazy_release functions do you have? Why is this a callback anyway. If not needed, then please simplify this.

> + info->tx_enabled = 0;

If used as bool, then I prefer bool and start using false here.

> +}
> +
> +void h4p_enable_tx_nopm(struct h4p_info *info)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&info->lock, flags);
> + h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> + UART_IER_THRI);

You need to align this with h4p_inb so that you can tell where it belongs to.

Or just read it into a value and then store the ORed value.

> + spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +void h4p_enable_tx(struct h4p_info *info)
> +{
> + unsigned long flags;
> +
> + if (!info->pm_enabled)
> + return;
> +
> + h4p_schedule_pm(info);
> +
> + spin_lock_irqsave(&info->lock, flags);
> + del_timer(&info->lazy_release);
> + h4p_set_clk(info, &info->tx_clocks_en, 1);
> + info->tx_enabled = 1;

bool?

> + gpio_set_value(info->bt_wakeup_gpio, 1);
> + h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> + UART_IER_THRI);

Same as above. This needs proper alignment. Or just two calls.

> + /*
> + * Disable smart-idle as UART TX interrupts
> + * are not wake-up capable
> + */

Comment style follows the net comment style.

/* foo
* bar
*/

> + h4p_smart_idle(info, 0);
> +
> + spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +static void h4p_disable_rx(struct h4p_info *info)
> +{
> + if (!info->pm_enabled)
> + return;
> +
> + info->rx_enabled = 0;

bool?

> +
> + if (h4p_inb(info, UART_LSR) & UART_LSR_DR)
> + return;
> +
> + if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
> + return;
> +
> + __h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> + info->autorts = 0;
> + h4p_set_clk(info, &info->rx_clocks_en, 0);
> +}
> +
> +static void h4p_enable_rx(struct h4p_info *info)
> +{
> + if (!info->pm_enabled)
> + return;
> +
> + h4p_schedule_pm(info);
> +
> + h4p_set_clk(info, &info->rx_clocks_en, 1);

true instead of 1?

> + info->rx_enabled = 1;

bool?

> +
> + if (!(h4p_inb(info, UART_LSR) & UART_LSR_TEMT))
> + return;
> +
> + __h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);

true instead of 1?

> + info->autorts = 1;

bool?

> +}
> +
> +void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb)
> +{
> + skb_queue_tail(&info->txq, skb);
> + h4p_enable_tx_nopm(info);
> +}
> +
> +/* Negotiation functions */
> +int h4p_send_alive_packet(struct h4p_info *info)
> +{
> + struct h4p_alive_hdr *hdr;
> + struct h4p_alive_pkt *pkt;
> + struct sk_buff *skb;
> + int len;
> +
> + BT_DBG("Sending alive packet");
> +
> + len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
> + skb = bt_skb_alloc(len, GFP_KERNEL);
> + if (!skb)
> + return -ENOMEM;
> +
> + memset(skb->data, 0x00, len);

What is this memset for? We really never do that in any of the other drivers.

> + *skb_put(skb, 1) = H4_ALIVE_PKT;
> + hdr = (struct h4p_alive_hdr *)skb_put(skb, sizeof(*hdr));
> + hdr->dlen = sizeof(*pkt);
> + pkt = (struct h4p_alive_pkt *)skb_put(skb, sizeof(*pkt));
> + pkt->mid = H4P_ALIVE_REQ;
> +
> + h4p_simple_send_frame(info, skb);
> +
> + BT_DBG("Alive packet sent");
> +
> + return 0;
> +}
> +
> +static void h4p_alive_packet(struct h4p_info *info,
> + struct sk_buff *skb)

Proper alignment according to the net coding style please.

> +{
> + struct h4p_alive_hdr *hdr;
> + struct h4p_alive_pkt *pkt;
> +
> + BT_DBG("Received alive packet");

Normally we have empty lines before and after the BT_DBUG in the function.

> + hdr = (struct h4p_alive_hdr *)skb->data;
> + if (hdr->dlen != sizeof(*pkt)) {
> + dev_err(info->dev, "Corrupted alive message\n");
> + info->init_error = -EIO;
> + goto finish_alive;
> + }
> +
> + pkt = (struct h4p_alive_pkt *)skb_pull(skb, sizeof(*hdr));
> + if (pkt->mid != H4P_ALIVE_RESP) {
> + dev_err(info->dev, "Could not negotiate nokia_h4p settings\n");
> + info->init_error = -EINVAL;
> + }
> +
> +finish_alive:
> + complete(&info->init_completion);
> + kfree_skb(skb);
> +}
> +
> +static int h4p_send_negotiation(struct h4p_info *info)
> +{
> + struct h4p_neg_cmd *neg_cmd;
> + struct h4p_neg_hdr *neg_hdr;
> + struct sk_buff *skb;
> + int err, len;
> + u16 sysclk = 38400;
> +
> + printk("Sending negotiation..");

Should be a BT_DBG.

> + len = sizeof(*neg_cmd) + sizeof(*neg_hdr) + H4_TYPE_SIZE;
> +
> + skb = bt_skb_alloc(len, GFP_KERNEL);
> + if (!skb)
> + return -ENOMEM;
> +
> + memset(skb->data, 0x00, len);
> + *skb_put(skb, 1) = H4_NEG_PKT;
> + neg_hdr = (struct h4p_neg_hdr *)skb_put(skb, sizeof(*neg_hdr));
> + neg_cmd = (struct h4p_neg_cmd *)skb_put(skb, sizeof(*neg_cmd));
> +
> + neg_hdr->dlen = sizeof(*neg_cmd);
> + neg_cmd->ack = H4P_NEG_REQ;
> + neg_cmd->baud = cpu_to_le16(BT_BAUDRATE_DIVIDER/MAX_BAUD_RATE);
> + neg_cmd->proto = H4P_PROTO_BYTE;
> + neg_cmd->sys_clk = cpu_to_le16(sysclk);
> +
> + h4p_change_speed(info, INIT_SPEED);
> +
> + h4p_set_rts(info, 1);
> + info->init_error = 0;
> + init_completion(&info->init_completion);
> +
> + h4p_simple_send_frame(info, skb);
> +
> + if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> + msecs_to_jiffies(1000))) {
> + printk("h4p: negotiation did not return\n");

sounds like a BT_ERR to me.

> + return -ETIMEDOUT;
> + }
> +
> + if (info->init_error < 0)
> + return info->init_error;
> +
> + /* Change to operational settings */
> + h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> + h4p_set_rts(info, 0);
> + h4p_change_speed(info, MAX_BAUD_RATE);
> +
> + err = h4p_wait_for_cts(info, 1, 100);
> + if (err < 0)
> + return err;
> +
> + h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> + init_completion(&info->init_completion);
> + err = h4p_send_alive_packet(info);
> +

No extra empty line here.

> + if (err < 0)
> + return err;
> +
> + if (!wait_for_completion_interruptible_timeout(&info->init_completion,
> + msecs_to_jiffies(1000)))

The alignment of the indentation is wrong.

> + return -ETIMEDOUT;
> +
> + if (info->init_error < 0)
> + return info->init_error;
> +
> + printk("Negotiation successful\n");

BT_DBG.

> + return 0;
> +}
> +
> +static void h4p_negotiation_packet(struct h4p_info *info,
> + struct sk_buff *skb)

Indentation.

Please just get this right since I most likely miss a few in the review.

> +{
> + struct h4p_neg_hdr *hdr;
> + struct h4p_neg_evt *evt;
> +
> + hdr = (struct h4p_neg_hdr *)skb->data;
> + if (hdr->dlen != sizeof(*evt)) {
> + info->init_error = -EIO;
> + goto finish_neg;
> + }
> +
> + evt = (struct h4p_neg_evt *)skb_pull(skb, sizeof(*hdr));
> +
> + if (evt->ack != H4P_NEG_ACK) {
> + dev_err(info->dev, "Could not negotiate nokia_h4p settings\n");
> + info->init_error = -EINVAL;
> + }
> +
> + info->man_id = evt->man_id;
> + info->ver_id = evt->ver_id;
> + printk("Negotiation finished.\n");

BT_DBG.

> +
> +finish_neg:
> +

This extra empty line here is not needed.

> + complete(&info->init_completion);
> + kfree_skb(skb);
> +}
> +
> +/* H4 packet handling functions */
> +static int h4p_get_hdr_len(struct h4p_info *info, u8 pkt_type)
> +{
> + long retval;

I do not get why retval is long and function returns int.

> +
> + switch (pkt_type) {
> + case H4_EVT_PKT:
> + retval = HCI_EVENT_HDR_SIZE;
> + break;
> + case H4_ACL_PKT:
> + retval = HCI_ACL_HDR_SIZE;
> + break;
> + case H4_SCO_PKT:
> + retval = HCI_SCO_HDR_SIZE;
> + break;
> + case H4_NEG_PKT:
> + retval = H4P_NEG_HDR_SIZE;
> + break;
> + case H4_ALIVE_PKT:
> + retval = H4P_ALIVE_HDR_SIZE;
> + break;
> + case H4_RADIO_PKT:
> + retval = H4_RADIO_HDR_SIZE;
> + break;
> + default:
> + dev_err(info->dev, "Unknown H4 packet type 0x%.2x\n", pkt_type);
> + retval = -1;
> + break;
> + }
> +
> + return retval;
> +}
> +
> +static unsigned int h4p_get_data_len(struct h4p_info *info,
> + struct sk_buff *skb)

Indentation.

> +{
> + long retval = -1;

use a default label in the switch statement instead of assigning the variable.

And again, why long if the return value is unsigned int.

> + struct hci_acl_hdr *acl_hdr;
> + struct hci_sco_hdr *sco_hdr;
> + struct hci_event_hdr *evt_hdr;
> + struct h4p_neg_hdr *neg_hdr;
> + struct h4p_alive_hdr *alive_hdr;
> + struct h4p_radio_hdr *radio_hdr;
> +
> + switch (bt_cb(skb)->pkt_type) {
> + case H4_EVT_PKT:
> + evt_hdr = (struct hci_event_hdr *)skb->data;
> + retval = evt_hdr->plen;
> + break;
> + case H4_ACL_PKT:
> + acl_hdr = (struct hci_acl_hdr *)skb->data;
> + retval = le16_to_cpu(acl_hdr->dlen);
> + break;
> + case H4_SCO_PKT:
> + sco_hdr = (struct hci_sco_hdr *)skb->data;
> + retval = sco_hdr->dlen;
> + break;
> + case H4_RADIO_PKT:
> + radio_hdr = (struct h4p_radio_hdr *)skb->data;
> + retval = radio_hdr->dlen;
> + break;
> + case H4_NEG_PKT:
> + neg_hdr = (struct h4p_neg_hdr *)skb->data;
> + retval = neg_hdr->dlen;
> + break;
> + case H4_ALIVE_PKT:
> + alive_hdr = (struct h4p_alive_hdr *)skb->data;
> + retval = alive_hdr->dlen;
> + break;
> + }
> +
> + return retval;
> +}
> +
> +static inline void h4p_recv_frame(struct h4p_info *info,
> + struct sk_buff *skb)

Indentation.

> +{
> + if (info->initing) {

So "initing" is not even an English word. Can use something that makes actually some sense.

> + switch (bt_cb(skb)->pkt_type) {
> + case H4_NEG_PKT:
> + h4p_negotiation_packet(info, skb);
> + info->rx_state = WAIT_FOR_PKT_TYPE;
> + return;
> + case H4_ALIVE_PKT:
> + h4p_alive_packet(info, skb);
> + info->rx_state = WAIT_FOR_PKT_TYPE;
> + return;
> + }
> + }
> +
> + hci_recv_frame(info->hdev, skb);
> + BT_DBG("Frame sent to upper layer");
> +}
> +
> +static inline void h4p_handle_byte(struct h4p_info *info, u8 byte)
> +{
> + switch (info->rx_state) {
> + case WAIT_FOR_PKT_TYPE:
> + bt_cb(info->rx_skb)->pkt_type = byte;
> + info->rx_count = h4p_get_hdr_len(info, byte);

And I looked, info->rx_count is long. I do not get this variable classification. If this is used as state machine sync, then long is overkill. Bluetooth HCI packets will never be that long (pun intended)

> + if (info->rx_count < 0) {
> + info->hdev->stat.err_rx++;
> + kfree_skb(info->rx_skb);
> + info->rx_skb = NULL;
> + } else {
> + info->rx_state = WAIT_FOR_HEADER;
> + }
> + break;
> + case WAIT_FOR_HEADER:
> + info->rx_count--;
> + *skb_put(info->rx_skb, 1) = byte;
> + if (info->rx_count != 0)
> + break;
> + info->rx_count = h4p_get_data_len(info, info->rx_skb);
> + if (info->rx_count > skb_tailroom(info->rx_skb)) {
> + dev_err(info->dev, "frame too long\n");
> + info->garbage_bytes = info->rx_count
> + - skb_tailroom(info->rx_skb);
> + kfree_skb(info->rx_skb);
> + info->rx_skb = NULL;
> + break;
> + }
> + info->rx_state = WAIT_FOR_DATA;
> + break;
> + case WAIT_FOR_DATA:
> + info->rx_count--;
> + *skb_put(info->rx_skb, 1) = byte;
> + break;
> + default:
> + WARN_ON(1);
> + break;
> + }
> +
> + if (info->rx_count == 0) {
> + /* H4+ devices should always send word aligned packets */
> + if (!(info->rx_skb->len % 2))
> + info->garbage_bytes++;
> + h4p_recv_frame(info, info->rx_skb);

I still do not get why the functionality of h4p_recv_frame is not just inlined here.

And more importantly, are we doing something about this word alignment here. What are these garbage_bytes for?

> + info->rx_skb = NULL;
> + }
> +}
> +
> +static void h4p_rx_tasklet(unsigned long data)
> +{
> + u8 byte;
> + struct h4p_info *info = (struct h4p_info *)data;

Swap these two around.

> +
> + BT_DBG("rx_tasklet woke up");
> +
> + while (h4p_inb(info, UART_LSR) & UART_LSR_DR) {
> + byte = h4p_inb(info, UART_RX);
> + BT_DBG("[in: %02x]", byte);
> + if (info->garbage_bytes) {
> + info->garbage_bytes--;
> + continue;
> + }
> + if (info->rx_skb == NULL) {

if (!info->rx_skb) {

> + info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
> + GFP_ATOMIC | GFP_DMA);
> + if (!info->rx_skb) {
> + dev_err(info->dev,
> + "No memory for new packet\n");
> + goto finish_rx;
> + }
> + info->rx_state = WAIT_FOR_PKT_TYPE;
> + info->rx_skb->dev = (void *)info->hdev;
> + }
> + info->hdev->stat.byte_rx++;
> + h4p_handle_byte(info, byte);
> + }
> +
> + if (!info->rx_enabled) {
> + if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT &&
> + info->autorts) {

Indentation and please use extra ( ) to make clear what you want.

if ((h4p_inb(..) & UART_...)
info->autocrts) {

> + __h4p_set_auto_ctsrts(info, 0 , UART_EFR_RTS);
> + info->autorts = 0;

bool?

> + }
> + /* Flush posted write to avoid spurious interrupts */
> + h4p_inb(info, UART_OMAP_SCR);
> + h4p_set_clk(info, &info->rx_clocks_en, 0);

bool?

I think we have a of int where using bool + false/true would make the code a lot easier to read. Since I most likely will miss a few, please fix them all up.

> + }
> +
> +finish_rx:
> + BT_DBG("rx_ended");
> +}
> +
> +static void h4p_tx_tasklet(unsigned long data)
> +{
> + unsigned int sent = 0;
> + struct sk_buff *skb;
> + struct h4p_info *info = (struct h4p_info *)data;

The variable assignment from the function parameters should be always first. So swap it with the sent variable.

> +
> + BT_DBG("tx_tasklet woke up");
> +
> + if (info->autorts != info->rx_enabled) {
> + if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> + if (info->autorts && !info->rx_enabled) {
> + __h4p_set_auto_ctsrts(info, 0,
> + UART_EFR_RTS);

Alignment.

> + info->autorts = 0;
> + }
> + if (!info->autorts && info->rx_enabled) {
> + __h4p_set_auto_ctsrts(info, 1,
> + UART_EFR_RTS);

Alignment.

> + info->autorts = 1;
> + }
> + } else {
> + h4p_outb(info, UART_OMAP_SCR,
> + h4p_inb(info, UART_OMAP_SCR) |
> + UART_OMAP_SCR_EMPTY_THR);

Alignment.

> + goto finish_tx;
> + }
> + }
> +
> + skb = skb_dequeue(&info->txq);
> + if (!skb) {
> + /* No data in buffer */
> + BT_DBG("skb ready");
> + if (h4p_inb(info, UART_LSR) & UART_LSR_TEMT) {
> + h4p_outb(info, UART_IER,
> + h4p_inb(info, UART_IER) &
> + ~UART_IER_THRI);

Alignment.

> + h4p_inb(info, UART_OMAP_SCR);
> + h4p_disable_tx(info);
> + return;
> + }
> + h4p_outb(info, UART_OMAP_SCR,
> + h4p_inb(info, UART_OMAP_SCR) |
> + UART_OMAP_SCR_EMPTY_THR);

Alignment.

> + goto finish_tx;
> + }
> +
> + /* Copy data to tx fifo */
> + while (!(h4p_inb(info, UART_OMAP_SSR) & UART_OMAP_SSR_TXFULL) &&
> + (sent < skb->len)) {
> + BT_DBG("%02x ", skb->data[sent]);
> + h4p_outb(info, UART_TX, skb->data[sent]);
> + sent++;
> + }
> +
> + info->hdev->stat.byte_tx += sent;
> + if (skb->len == sent) {
> + kfree_skb(skb);
> + } else {
> + skb_pull(skb, sent);
> + skb_queue_head(&info->txq, skb);
> + }
> +
> + h4p_outb(info, UART_OMAP_SCR, h4p_inb(info, UART_OMAP_SCR) &
> + ~UART_OMAP_SCR_EMPTY_THR);

Alignment.

> + h4p_outb(info, UART_IER, h4p_inb(info, UART_IER) |
> + UART_IER_THRI);

Alignment.

I really get the feeling read the value into a variable and then using it would make this more readable.

> +
> +finish_tx:
> + /* Flush posted write to avoid spurious interrupts */
> + h4p_inb(info, UART_OMAP_SCR);
> +
> +}
> +
> +static irqreturn_t h4p_interrupt(int irq, void *data)
> +{
> + struct h4p_info *info = (struct h4p_info *)data;
> + u8 iir, msr;
> + int ret;
> +
> + ret = IRQ_NONE;
> +
> + iir = h4p_inb(info, UART_IIR);
> + if (iir & UART_IIR_NO_INT)
> + return IRQ_HANDLED;
> +
> + iir &= UART_IIR_ID;
> +
> + if (iir == UART_IIR_MSI) {
> + msr = h4p_inb(info, UART_MSR);
> + ret = IRQ_HANDLED;
> + }
> + if (iir == UART_IIR_RLSI) {
> + h4p_inb(info, UART_RX);
> + h4p_inb(info, UART_LSR);
> + ret = IRQ_HANDLED;
> + }
> +
> + if (iir == UART_IIR_RDI) {
> + h4p_rx_tasklet((unsigned long)data);
> + ret = IRQ_HANDLED;
> + }
> +
> + if (iir == UART_IIR_THRI) {
> + h4p_tx_tasklet((unsigned long)data);
> + ret = IRQ_HANDLED;
> + }
> +
> + return ret;
> +}
> +
> +static irqreturn_t h4p_wakeup_interrupt(int irq, void *dev_inst)
> +{
> + struct h4p_info *info = dev_inst;
> + int should_wakeup;
> + struct hci_dev *hdev;
> +
> + BT_DBG("[wakeup irq]");
> +
> + if (!info->hdev)
> + return IRQ_HANDLED;
> +
> + should_wakeup = gpio_get_value(info->host_wakeup_gpio);
> + hdev = info->hdev;

Are you using hdev here at all?

> +
> + if (info->initing) {
> + if (should_wakeup == 1)
> + complete_all(&info->test_completion);
> +
> + printk("wakeup irq handled\n");

We are not using printk directly. Sounds like BT_DBG to me.
> +
> + return IRQ_HANDLED;
> + }
> +
> + BT_DBG("gpio interrupt %d", should_wakeup);
> +
> + /* Check if we have missed some interrupts */
> + if (info->rx_enabled == should_wakeup)
> + return IRQ_HANDLED;
> +
> + if (should_wakeup)
> + h4p_enable_rx(info);
> + else
> + h4p_disable_rx(info);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int h4p_reset(struct h4p_info *info)
> +{
> + int err;
> +
> + err = h4p_reset_uart(info);
> + if (err < 0) {
> + dev_err(info->dev, "Uart reset failed\n");
> + return err;
> + }
> + h4p_init_uart(info);
> + h4p_set_rts(info, 0);
> +
> + gpio_set_value(info->reset_gpio, 0);
> + gpio_set_value(info->bt_wakeup_gpio, 1);
> + msleep(10);
> +
> + if (gpio_get_value(info->host_wakeup_gpio) == 1) {
> + dev_err(info->dev, "host_wakeup_gpio not low\n");
> + return -EPROTO;
> + }
> +
> + init_completion(&info->test_completion);
> + gpio_set_value(info->reset_gpio, 1);
> +
> + if (!wait_for_completion_interruptible_timeout(&info->test_completion,
> + msecs_to_jiffies(100))) {
> + dev_err(info->dev, "wakeup test timed out\n");
> + complete_all(&info->test_completion);
> + return -EPROTO;
> + }
> +
> + err = h4p_wait_for_cts(info, 1, 100);
> + if (err < 0) {
> + dev_err(info->dev, "No cts from bt chip\n");
> + return err;
> + }
> +
> + h4p_set_rts(info, 1);
> +
> + return 0;
> +}
> +
> +/* hci callback functions */
> +static int h4p_hci_flush(struct hci_dev *hdev)
> +{
> + struct h4p_info *info = hci_get_drvdata(hdev);
> +
> + skb_queue_purge(&info->txq);
> +
> + return 0;
> +}
> +
> +static int h4p_bt_wakeup_test(struct h4p_info *info)
> +{
> + /*
> + * Test Sequence:
> + * Host de-asserts the BT_WAKE_UP line.
> + * Host polls the UART_CTS line, waiting for it to be de-asserted.
> + * Host asserts the BT_WAKE_UP line.
> + * Host polls the UART_CTS line, waiting for it to be asserted.
> + * Host de-asserts the BT_WAKE_UP line (allow the Bluetooth device to
> + * sleep).
> + * Host polls the UART_CTS line, waiting for it to be de-asserted.
> + */
> + int err;
> + int ret = -ECOMM;

This is confusing. err and ret? Can we just use one.

> +
> + if (!info)
> + return -EINVAL;
> +
> + /* Disable wakeup interrupts */
> + disable_irq(gpio_to_irq(info->host_wakeup_gpio));
> +
> + gpio_set_value(info->bt_wakeup_gpio, 0);
> + err = h4p_wait_for_cts(info, 0, 100);
> + if (err) {
> + dev_warn(info->dev,
> + "bt_wakeup_test: fail: CTS low timed out: %d\n",
> + err);

Alignment.

> + goto out;
> + }
> +
> + gpio_set_value(info->bt_wakeup_gpio, 1);
> + err = h4p_wait_for_cts(info, 1, 100);
> + if (err) {
> + dev_warn(info->dev,
> + "bt_wakeup_test: fail: CTS high timed out: %d\n",
> + err);

Alignment.

> + goto out;
> + }
> +
> + gpio_set_value(info->bt_wakeup_gpio, 0);
> + err = h4p_wait_for_cts(info, 0, 100);
> + if (err) {
> + dev_warn(info->dev,
> + "bt_wakeup_test: fail: CTS re-low timed out: %d\n",
> + err);
> + goto out;
> + }
> +
> + ret = 0;
> +
> +out:
> +
> + /* Re-enable wakeup interrupts */
> + enable_irq(gpio_to_irq(info->host_wakeup_gpio));
> +
> + return ret;
> +}
> +
> +static int h4p_hci_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
> +{
> + struct sk_buff *skb;
> + long ret;
> +
> + printk("Set bdaddr... %pMR\n", bdaddr);

BT_DBG or BT_INFO if you want it printed out all the time.

> +
> + skb = __hci_cmd_sync(hdev, 0xfc01, 6, bdaddr, HCI_INIT_TIMEOUT);
> + if (IS_ERR(skb)) {
> + ret = PTR_ERR(skb);
> + BT_ERR("%s: BCM: Change address command failed (%ld)",
> + hdev->name, ret);
> + return ret;
> + }
> + kfree_skb(skb);
> +
> + return 0;
> +}
> +
> +static void h4p_deinit(struct hci_dev *hdev)
> +{
> + struct h4p_info *info = hci_get_drvdata(hdev);
> +
> + h4p_hci_flush(hdev);
> + h4p_set_clk(info, &info->tx_clocks_en, 1);
> + h4p_set_clk(info, &info->rx_clocks_en, 1);
> + h4p_reset_uart(info);
> + del_timer_sync(&info->lazy_release);
> + h4p_set_clk(info, &info->tx_clocks_en, 0);
> + h4p_set_clk(info, &info->rx_clocks_en, 0);
> + gpio_set_value(info->reset_gpio, 0);
> + gpio_set_value(info->bt_wakeup_gpio, 0);
> + kfree_skb(info->rx_skb);
> + info->rx_skb = NULL;
> +}
> +
> +static int h4p_setup(struct hci_dev *hdev)
> +{
> + struct h4p_info *info = hci_get_drvdata(hdev);
> + int err;
> + unsigned long flags;
> +
> + /* TI1271 has HW bug and boot up might fail. Nokia retried up to 3x. */

But this is for the Broadcom based devices. So this comment is not really useful here.

> +
> + h4p_set_clk(info, &info->tx_clocks_en, 1);
> + h4p_set_clk(info, &info->rx_clocks_en, 1);
> +
> + if (!hw_inited) {

So this magic global variable is a no go. I know that nobody has two of these devices installed, but we are just not doing that. Period.

And on a side not, "inited" is not a real word either. Please pick proper variable names.

> + h4p_set_auto_ctsrts(info, 1, UART_EFR_CTS | UART_EFR_RTS);
> + info->autorts = 1;
> +
> + info->initing = 1;
> + printk("hci_setup\n");

BT_DBG.

> +
> + err = h4p_send_negotiation(info);
> + if (err < 0)
> + goto err_clean;
> + }
> +
> + /*
> + * Disable smart-idle as UART TX interrupts
> + * are not wake-up capable
> + */
> + h4p_smart_idle(info, 0);
> +
> + err = h4p_read_fw(info);
> + if (err < 0) {
> + dev_err(info->dev, "Cannot read firmware\n");
> + goto err_clean;
> + }
> +
> +
> + h4p_set_auto_ctsrts(info, 0, UART_EFR_RTS);
> + h4p_set_rts(info, 0);
> + h4p_change_speed(info, BC4_MAX_BAUD_RATE);
> + h4p_set_auto_ctsrts(info, 1, UART_EFR_RTS);
> +
> + info->pm_enabled = 1;
> +
> + err = h4p_bt_wakeup_test(info);
> + if (err < 0) {
> + dev_err(info->dev, "BT wakeup test failed.\n");
> + goto err_clean;
> + }
> +
> + spin_lock_irqsave(&info->lock, flags);
> + info->rx_enabled = gpio_get_value(info->host_wakeup_gpio);
> + h4p_set_clk(info, &info->rx_clocks_en, info->rx_enabled);
> + spin_unlock_irqrestore(&info->lock, flags);
> +
> + h4p_set_clk(info, &info->tx_clocks_en, 0);
> +
> + info->initing = 0;
> + hw_inited = 1;
> + return 0;
> +
> +err_clean:
> + printk("hci_setup: something failed, should do the clean up\n");

BT_ERR.

> + h4p_hci_flush(hdev);
> + h4p_deinit(hdev);
> + return err;
> +}
> +
> +static int h4p_hci_setup(struct hci_dev *hdev)
> +{
> + return h4p_setup(hdev);

Why are we doing this?

This also seems wrong. You should enable the hardware within the probe function that registers the hci_dev or from a rfkill switch. Not from the hdev->setup callback. This callback is for running HCI commands that handle firmware loading and general configuration of the controller over HCI. If it is not HCI based, then it does belong there.

Messing with the flow of how what the core thinks you are doing is just dangerous.

> +}
> +
> +

No double empty lines.

> +static int h4p_boot(struct hci_dev *hdev)
> +{
> + struct h4p_info *info = hci_get_drvdata(hdev);
> + int err;
> +
> + info->rx_enabled = 1;
> + info->rx_state = WAIT_FOR_PKT_TYPE;
> + info->rx_count = 0;
> + info->garbage_bytes = 0;
> + info->rx_skb = NULL;
> + info->pm_enabled = 0;
> + init_completion(&info->fw_completion);
> + h4p_set_clk(info, &info->tx_clocks_en, 1);
> + h4p_set_clk(info, &info->rx_clocks_en, 1);
> +
> + err = h4p_reset(info);
> + return err;
> +}
> +
> +static int h4p_hci_open(struct hci_dev *hdev)
> +{
> + set_bit(HCI_RUNNING, &hdev->flags);
> + return 0;
> +}
> +
> +static int h4p_hci_close(struct hci_dev *hdev)
> +{
> + clear_bit(HCI_RUNNING, &hdev->flags);
> + return 0;
> +}
> +
> +static int h4p_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> + struct h4p_info *info = hci_get_drvdata(hdev);
> + int err = 0;
> +
> + BT_DBG("hci_send_frame: dev %p, skb %p\n", hdev, skb);

BT_DBG does not need \n.

> +
> + if (!test_bit(HCI_RUNNING, &hdev->flags)) {
> + dev_warn(info->dev, "Frame for non-running device\n");
> + return -EIO;
> + }

Can we just return -EBUSY and no extra warning like all the other drivers do.

> +
> + switch (bt_cb(skb)->pkt_type) {
> + case HCI_COMMAND_PKT:
> + hdev->stat.cmd_tx++;
> + break;
> + case HCI_ACLDATA_PKT:
> + hdev->stat.acl_tx++;
> + break;
> + case HCI_SCODATA_PKT:
> + hdev->stat.sco_tx++;
> + break;
> + }
> +
> + /* Push frame type to skb */
> + *skb_push(skb, 1) = (bt_cb(skb)->pkt_type);

What are the extra ( ) for?

> + /* We should always send word aligned data to h4+ devices */
> + if (skb->len % 2) {
> + err = skb_pad(skb, 1);
> + if (!err)
> + *skb_put(skb, 1) = 0x00;
> + }
> + if (err)
> + return err;

This is crazy code.

if (skb->len % 2) {
if (!skb_pad(skb, 1)
return -ENOMEM;
*skb_put(skb, 1) = 0x00;
}

> +
> + skb_queue_tail(&info->txq, skb);
> + if (!info->initing)
> + h4p_enable_tx(info);
> + else
> + h4p_enable_tx_nopm(info);
> +
> + return 0;
> +}
> +
> +static int h4p_probe_dt(struct platform_device *pdev, struct h4p_info *info)
> +{
> + struct device_node *node;
> + struct device_node *uart = pdev->dev.of_node;
> + u32 val;
> + struct resource *mem;
> +
> + node = of_get_child_by_name(uart, "device");
> +
> + if (!node)
> + return -ENODATA;
> +
> + info->chip_type = 3; /* Bcm2048 */
> +
> + if (of_property_read_u32(node, "bt-sysclk", &val)) return -EINVAL;

Two lines please.

> + info->bt_sysclk = val;
> +
> + info->reset_gpio = of_get_named_gpio(node, "reset-gpios", 0);
> + info->host_wakeup_gpio = of_get_named_gpio(node, "host-wakeup-gpios", 0);
> + info->bt_wakeup_gpio = of_get_named_gpio(node, "bluetooth-wakeup-gpios", 0);
> +
> + if (!uart) {
> + dev_err(&pdev->dev, "UART link not provided\n");
> + return -EINVAL;
> + }
> +
> + info->irq = irq_of_parse_and_map(uart, 0);
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + info->uart_base = devm_ioremap_resource(&pdev->dev, mem);
> +
> + info->uart_iclk = of_clk_get_by_name(uart, "ick");
> + info->uart_fclk = of_clk_get_by_name(uart, "fck");
> +
> + printk("DT: have neccessary data\n");
> + return 0;
> +}
> +
> +
> +static int h4p_probe(struct platform_device *pdev)
> +{
> + struct hci_dev *hdev;
> + struct h4p_info *info;
> + int err;
> +
> + dev_info(&pdev->dev, "Registering HCI H4P device\n");
> + info = devm_kzalloc(&pdev->dev, sizeof(struct h4p_info),
> + GFP_KERNEL);

Indentation.

> + if (!info)
> + return -ENOMEM;
> +
> + info->dev = &pdev->dev;
> + info->tx_enabled = 1;
> + info->rx_enabled = 1;
> + spin_lock_init(&info->lock);
> + spin_lock_init(&info->clocks_lock);
> + skb_queue_head_init(&info->txq);
> +
> + err = h4p_probe_dt(pdev, info);
> + if (err) {
> + dev_err(&pdev->dev, "Could not get Bluetooth config data\n");
> + return -ENODATA;
> + }
> +
> + BT_DBG("base/irq gpio: %p/%d",
> + info->uart_base, info->irq);
> + BT_DBG("RESET/BTWU/HOSTWU gpio: %d/%d/%d",
> + info->reset_gpio, info->bt_wakeup_gpio, info->host_wakeup_gpio);
> + BT_DBG("chip type, sysclk: %d/%d", info->chip_type, info->bt_sysclk);
> + BT_DBG("clock i/f: %p/%p", info->uart_iclk, info->uart_fclk);
> +
> + init_completion(&info->test_completion);
> + complete_all(&info->test_completion);
> +
> + err = devm_gpio_request_one(&pdev->dev, info->reset_gpio,
> + GPIOF_OUT_INIT_LOW, "bt_reset");
> + if (err < 0) {
> + dev_err(&pdev->dev, "Cannot get GPIO line %d\n",
> + info->reset_gpio);
> + return err;
> + }
> +
> + err = devm_gpio_request_one(&pdev->dev, info->bt_wakeup_gpio,
> + GPIOF_OUT_INIT_LOW, "bt_wakeup");
> + if (err < 0) {
> + dev_err(info->dev, "Cannot get GPIO line 0x%d",
> + info->bt_wakeup_gpio);
> + return err;
> + }
> +
> + err = devm_gpio_request_one(&pdev->dev, info->host_wakeup_gpio,
> + GPIOF_DIR_IN, "host_wakeup");
> + if (err < 0) {
> + dev_err(info->dev, "Cannot get GPIO line %d",
> + info->host_wakeup_gpio);
> + return err;
> + }
> +
> + err = devm_request_irq(&pdev->dev, info->irq, h4p_interrupt,
> + IRQF_DISABLED, "nokia_h4p", info);
> + if (err < 0) {
> + dev_err(info->dev, "nokia_h4p: unable to get IRQ %d\n",
> + info->irq);
> + return err;
> + }
> +
> + err = devm_request_irq(&pdev->dev, gpio_to_irq(info->host_wakeup_gpio),
> + h4p_wakeup_interrupt, IRQF_TRIGGER_FALLING |
> + IRQF_TRIGGER_RISING | IRQF_DISABLED,
> + "h4p_wkup", info);

Indentation.

> + if (err < 0) {
> + dev_err(info->dev, "nokia_h4p: unable to get wakeup IRQ %d\n",
> + gpio_to_irq(info->host_wakeup_gpio));

Indentation.

> + return err;
> + }
> +
> + err = irq_set_irq_wake(gpio_to_irq(info->host_wakeup_gpio), 1);
> + if (err < 0) {
> + dev_err(info->dev, "nokia_h4p: unable to set wakeup for IRQ %d\n",
> + gpio_to_irq(info->host_wakeup_gpio));

Indentation.

> + return err;
> + }
> +
> + init_timer_deferrable(&info->lazy_release);
> + info->lazy_release.function = h4p_lazy_clock_release;
> + info->lazy_release.data = (unsigned long)info;
> + h4p_set_clk(info, &info->tx_clocks_en, 1);
> +
> + err = h4p_reset_uart(info);
> + if (err < 0)
> + return err;
> +
> + gpio_set_value(info->reset_gpio, 0);
> + h4p_set_clk(info, &info->tx_clocks_en, 0);
> +
> + platform_set_drvdata(pdev, info);
> +
> + /* Initialize and register HCI device */
> +
> + hdev = hci_alloc_dev();
> + if (!hdev) {
> + dev_err(info->dev, "Can't allocate memory for device\n");
> + return -ENOMEM;
> + }
> + info->hdev = hdev;
> +
> + hdev->bus = HCI_UART;
> + hci_set_drvdata(hdev, info);
> +
> + hdev->open = h4p_hci_open;
> + hdev->setup = h4p_hci_setup;
> + hdev->close = h4p_hci_close;
> + hdev->flush = h4p_hci_flush;
> + hdev->send = h4p_hci_send_frame;
> + hdev->set_bdaddr = h4p_hci_set_bdaddr;
> +
> +#ifndef TEST
> + set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
> +#endif

That needs to go away. It should be set by default actually when I merge the driver upstream.

You can introduce a module parameter like "use_default_bdaddr", but the default needs to be that we set this flag.

And lets face it, the distros running on the N900 need to start solving the problem of programming the BD_ADDR into the Bluetooth core.

> + SET_HCIDEV_DEV(hdev, info->dev);
> +
> + if (hci_register_dev(hdev) >= 0)
> + return h4p_boot(hdev);

Lets error out here like all the other drivers do.

> +
> + dev_err(info->dev, "hci_register failed %s.\n", hdev->name);
> + hci_free_dev(info->hdev);
> + return -ENODEV;

There is an extra empty space at the end of the line, look for these and fix them. I am really not the janitor here.

> +}
> +
> +static int h4p_remove(struct platform_device *pdev)
> +{
> + struct h4p_info *info = platform_get_drvdata(pdev);
> +
> + h4p_hci_close(info->hdev);
> + h4p_deinit(info->hdev);
> + hci_unregister_dev(info->hdev);
> + hci_free_dev(info->hdev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id h4p_of_match[] = {
> + { .compatible = "brcm,uart,bcm2048" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, h4p_of_match);
> +
> +static struct platform_driver h4p_driver = {
> + .probe = h4p_probe,
> + .remove = h4p_remove,
> + .driver = {
> + .name = "disabled" "nokia_h4p",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(h4p_of_match),
> + },
> +};

This one can not be const?

> +
> +module_platform_driver(h4p_driver);
> +
> +MODULE_ALIAS("platform:nokia_h4p");
> +MODULE_DESCRIPTION("Bluetooth h4 driver with nokia extensions");

s/h4/H4/

> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ville Tervo");
> diff --git a/drivers/bluetooth/nokia_fw.c b/drivers/bluetooth/nokia_fw.c
> new file mode 100644
> index 0000000..80e4385
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_fw.c
> @@ -0,0 +1,101 @@
> +/*
> + * This file is part of nokia_h4p bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#define DEBUG
Why?

> +#include <linux/module.h>
> +#include <linux/skbuff.h>
> +#include <linux/firmware.h>
> +#include <linux/clk.h>
> +
> +#include <net/bluetooth/bluetooth.h>
> +
> +#include "nokia_h4p.h"
> +
> +#define FW_NAME_BCM2048 "nokia/bcmfw.bin"
> +
> +/* Read fw. Return length of the command. If no more commands in
> + * fw 0 is returned. In error case return value is negative.
> + */
> +int h4p_read_fw(struct h4p_info *info)
> +{
> + int num = 0;
> + int fw_pos = 0;
> + struct sk_buff *skb;
> + const struct firmware *fw_entry = NULL;
> + int err = -ENOENT;
> + unsigned int cmd_len = 0;
> +
> + err = request_firmware(&fw_entry, FW_NAME_BCM2048, info->dev);
> + if (err != 0)
> + return err;
> +
> + while (1) {
> + int cmd, len;
> +
> + fw_pos += cmd_len;
> +
> + if (fw_pos >= fw_entry->size)
> + break;
> +
> + if (fw_pos + 2 > fw_entry->size) {
> + dev_err(info->dev, "Corrupted firmware image 1\n");
> + err = -EMSGSIZE;
> + break;
> + }
> +
> + cmd_len = fw_entry->data[fw_pos++];
> + cmd_len += fw_entry->data[fw_pos++] << 8;
> + if (cmd_len == 0)
> + break;
> +
> + if (fw_pos + cmd_len > fw_entry->size) {
> + dev_err(info->dev, "Corrupted firmware image 2\n");

Still not like the 1 and 2 in the error message. They make no sense. There is no image 1 and no image 2. It is a single image.

> + err = -EMSGSIZE;
> + break;
> + }
> +
> + /* Skip first two packets */
> + if (++num <= 2)
> + continue;
> +
> + /* Note that this is timing-critical. If sending packets takes too
> + long, initialization will fail. */
> + printk("Packet %d...", num);
> +
> + cmd = fw_entry->data[fw_pos+1];
> + cmd += fw_entry->data[fw_pos+2] << 8;
> + len = fw_entry->data[fw_pos+3];
> + printk("cmd %x, len %d.", cmd, len);
> +
> + skb = __hci_cmd_sync(info->hdev, cmd, len, fw_entry->data+fw_pos+4, 500);
> + if (IS_ERR(skb)) {
> + dev_err(info->dev, "...sending cmd failed %ld\n", PTR_ERR(skb));
> + err = -EIO;
> + break;
> + }
> + }
> +
> + release_firmware(fw_entry);
> + return err;
> +}
> +
> +MODULE_FIRMWARE(FW_NAME_BCM2048);
> diff --git a/drivers/bluetooth/nokia_h4p.h b/drivers/bluetooth/nokia_h4p.h
> new file mode 100644
> index 0000000..312c61c
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_h4p.h
> @@ -0,0 +1,228 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005-2008 Nokia Corporation.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +#include <linux/serial_reg.h>
> +
> +#define UART_SYSC_OMAP_RESET 0x03
> +#define UART_SYSS_RESETDONE 0x01
> +#define UART_OMAP_SCR_EMPTY_THR 0x08
> +#define UART_OMAP_SCR_WAKEUP 0x10
> +#define UART_OMAP_SSR_WAKEUP 0x02
> +#define UART_OMAP_SSR_TXFULL 0x01
> +
> +#define UART_OMAP_SYSC_IDLEMODE 0x03
> +#define UART_OMAP_SYSC_IDLEMASK (3 << UART_OMAP_SYSC_IDLEMODE)
> +
> +#define UART_OMAP_SYSC_FORCE_IDLE (0 << UART_OMAP_SYSC_IDLEMODE)
> +#define UART_OMAP_SYSC_NO_IDLE (1 << UART_OMAP_SYSC_IDLEMODE)
> +#define UART_OMAP_SYSC_SMART_IDLE (2 << UART_OMAP_SYSC_IDLEMODE)
> +
> +#define H4P_TRANSFER_MODE 1
> +#define H4P_SCHED_TRANSFER_MODE 2
> +#define H4P_ACTIVE_MODE 3
> +
> +struct h4p_info {
> + struct timer_list lazy_release;
> + struct hci_dev *hdev;
> + spinlock_t lock;
> +
> + void __iomem *uart_base;
> + unsigned long uart_phys_base;
> + int irq;
> + struct device *dev;
> + u8 chip_type;
> + u8 bt_wakeup_gpio;
> + u8 host_wakeup_gpio;
> + u8 reset_gpio;
> + u8 reset_gpio_shared;
> + u8 bt_sysclk;
> + u8 man_id;
> + u8 ver_id;
> +
> + struct sk_buff_head fw_queue;
> + struct sk_buff *alive_cmd_skb;
> + struct completion init_completion;
> + struct completion fw_completion;
> + struct completion test_completion;
> + int fw_error;
> + int init_error;
> +
> + struct sk_buff_head txq;
> +
> + struct sk_buff *rx_skb;
> + long rx_count;
> + unsigned long rx_state;
> + unsigned long garbage_bytes;
> +
> + struct sk_buff_head *fw_q;
> +
> + int pm_enabled;
> + int tx_enabled;
> + int autorts;
> + int rx_enabled;
> + unsigned long pm_flags;
> +
> + int tx_clocks_en;
> + int rx_clocks_en;
> + spinlock_t clocks_lock;
> + struct clk *uart_iclk;
> + struct clk *uart_fclk;
> + atomic_t clk_users;
> + u16 dll;
> + u16 dlh;
> + u16 ier;
> + u16 mdr1;
> + u16 efr;
> +
> + int initing;
> +};
> +
> +struct h4p_radio_hdr {
> + u8 evt;
> + u8 dlen;
> +} __packed;
> +
> +struct h4p_neg_hdr {
> + u8 dlen;
> +} __packed;
> +#define H4P_NEG_HDR_SIZE 1
> +
> +#define H4P_NEG_REQ 0x00
> +#define H4P_NEG_ACK 0x20
> +#define H4P_NEG_NAK 0x40
> +
> +#define H4P_PROTO_PKT 0x44
> +#define H4P_PROTO_BYTE 0x4c
> +
> +#define H4P_ID_CSR 0x02
> +#define H4P_ID_BCM2048 0x04
> +#define H4P_ID_TI1271 0x31
> +
> +struct h4p_neg_cmd {
> + u8 ack;
> + u16 baud;
> + u16 unused1;
> + u8 proto;
> + u16 sys_clk;
> + u16 unused2;

If these are little endian, the __le16 here. And most likely also __u8

> +} __packed;
> +
> +struct h4p_neg_evt {
> + u8 ack;
> + u16 baud;
> + u16 unused1;
> + u8 proto;
> + u16 sys_clk;
> + u16 unused2;
> + u8 man_id;
> + u8 ver_id;
> +} __packed;
> +
> +#define H4P_ALIVE_REQ 0x55
> +#define H4P_ALIVE_RESP 0xcc
> +
> +struct h4p_alive_hdr {
> + u8 dlen;
> +} __packed;
> +#define H4P_ALIVE_HDR_SIZE 1
> +
> +struct h4p_alive_pkt {
> + u8 mid;
> + u8 unused;
> +} __packed;
> +
> +#define MAX_BAUD_RATE 921600
> +#define BC4_MAX_BAUD_RATE 3692300
> +#define UART_CLOCK 48000000
> +#define BT_INIT_DIVIDER 320
> +#define BT_BAUDRATE_DIVIDER 384000000
> +#define BT_SYSCLK_DIV 1000
> +#define INIT_SPEED 120000
> +
> +#define H4_TYPE_SIZE 1
> +#define H4_RADIO_HDR_SIZE 2
> +
> +/* H4+ packet types */
> +#define H4_CMD_PKT 0x01
> +#define H4_ACL_PKT 0x02
> +#define H4_SCO_PKT 0x03
> +#define H4_EVT_PKT 0x04
> +#define H4_NEG_PKT 0x06
> +#define H4_ALIVE_PKT 0x07
> +#define H4_RADIO_PKT 0x08
> +
> +/* TX states */
> +#define WAIT_FOR_PKT_TYPE 1
> +#define WAIT_FOR_HEADER 2
> +#define WAIT_FOR_DATA 3
> +
> +struct hci_fw_event {
> + struct hci_event_hdr hev;
> + struct hci_ev_cmd_complete cmd;
> + u8 status;
> +} __packed;

Is this actually used.

> +
> +void h4p_simple_send_frame(struct h4p_info *info, struct sk_buff *skb);

I have no idea why this is public in the first place.

> +
> +int h4p_send_alive_packet(struct h4p_info *info);
> +

Same here.

> +int h4p_read_fw(struct h4p_info *info);
> +int h4p_send_fw(struct h4p_info *info);

This one does not even exist.

> +void h4p_parse_fw_event(struct h4p_info *info, struct sk_buff *skb);

And neither does this one.

Seriously here, why do I have to play janitor and look all these up :(

> +
> +static inline void h4p_outb(struct h4p_info *info, unsigned int offset, u8 val)
> +{
> + __raw_writeb(val, info->uart_base + (offset << 2));
> +}
> +
> +static inline u8 h4p_inb(struct h4p_info *info, unsigned int offset)
> +{
> + u8 val;
> + val = __raw_readb(info->uart_base + (offset << 2));
> + return val;
> +}
> +
> +static inline void h4p_set_rts(struct h4p_info *info, int active)
> +{
> + u8 b;
> +
> + b = h4p_inb(info, UART_MCR);
> + if (active)
> + b |= UART_MCR_RTS;
> + else
> + b &= ~UART_MCR_RTS;
> + h4p_outb(info, UART_MCR, b);
> +}
> +
> +int h4p_wait_for_cts(struct h4p_info *info, int active, int timeout_ms);
> +void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
> +void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which);
> +void h4p_change_speed(struct h4p_info *info, unsigned long speed);
> +int h4p_reset_uart(struct h4p_info *info);
> +void h4p_init_uart(struct h4p_info *info);
> +void h4p_enable_tx(struct h4p_info *info);
> +void h4p_store_regs(struct h4p_info *info);
> +void h4p_restore_regs(struct h4p_info *info);
> +void h4p_smart_idle(struct h4p_info *info, bool enable);
> diff --git a/drivers/bluetooth/nokia_uart.c b/drivers/bluetooth/nokia_uart.c
> new file mode 100644
> index 0000000..d95683a
> --- /dev/null
> +++ b/drivers/bluetooth/nokia_uart.c
> @@ -0,0 +1,179 @@
> +/*
> + * This file is part of Nokia H4P bluetooth driver
> + *
> + * Copyright (C) 2005, 2006 Nokia Corporation.
> + * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +
> +#include <linux/io.h>
> +
> +#include "nokia_h4p.h"
> +
> +
> +

Single empty line.

> +int h4p_wait_for_cts(struct h4p_info *info, int active,
> + int timeout_ms)

Indentation and bool for active.

> +{
> + unsigned long timeout;
> + int state;
> +
> + timeout = jiffies + msecs_to_jiffies(timeout_ms);
> + for (;;) {
> + state = h4p_inb(info, UART_MSR) & UART_MSR_CTS;
> + if (active) {
> + if (state)
> + return 0;
> + } else {
> + if (!state)
> + return 0;
> + }

if (active == !!state)
return 0;
> + if (time_after(jiffies, timeout))
> + return -ETIMEDOUT;
> + msleep(1);
> + }
> +}
> +
> +void __h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)
> +{

bool for on.

> + u8 lcr, b;
> +
> + lcr = h4p_inb(info, UART_LCR);
> + h4p_outb(info, UART_LCR, 0xbf);
> + b = h4p_inb(info, UART_EFR);
> + if (on)
> + b |= which;
> + else
> + b &= ~which;
> + h4p_outb(info, UART_EFR, b);
> + h4p_outb(info, UART_LCR, lcr);
> +}
> +
> +void h4p_set_auto_ctsrts(struct h4p_info *info, int on, u8 which)

bool for on.

> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&info->lock, flags);
> + __h4p_set_auto_ctsrts(info, on, which);
> + spin_unlock_irqrestore(&info->lock, flags);
> +}
> +
> +void h4p_change_speed(struct h4p_info *info, unsigned long speed)
> +{
> + unsigned int divisor;
> + u8 lcr, mdr1;
> +
> + BT_DBG("Setting speed %lu", speed);
> +
> + if (speed >= 460800) {
> + divisor = UART_CLOCK / 13 / speed;
> + mdr1 = 3;
> + } else {
> + divisor = UART_CLOCK / 16 / speed;
> + mdr1 = 0;
> + }
> +
> + /* Make sure UART mode is disabled */
> + h4p_outb(info, UART_OMAP_MDR1, 7);
> +
> + lcr = h4p_inb(info, UART_LCR);
> + h4p_outb(info, UART_LCR, UART_LCR_DLAB); /* Set DLAB */
> + h4p_outb(info, UART_DLL, divisor & 0xff); /* Set speed */
> + h4p_outb(info, UART_DLM, divisor >> 8);
> + h4p_outb(info, UART_LCR, lcr);
> +
> + /* Make sure UART mode is enabled */
> + h4p_outb(info, UART_OMAP_MDR1, mdr1);
> +}
> +
> +int h4p_reset_uart(struct h4p_info *info)
> +{
> + int count = 0;
> +
> + /* Reset the UART */
> + h4p_outb(info, UART_OMAP_SYSC, UART_SYSC_OMAP_RESET);
> + while (!(h4p_inb(info, UART_OMAP_SYSS) & UART_SYSS_RESETDONE)) {
> + if (count++ > 100) {
> + dev_err(info->dev, "nokia_h4p: UART reset timeout\n");
> + return -ENODEV;
> + }
> + udelay(1);
> + }
> +
> + return 0;
> +}
> +
> +void h4p_store_regs(struct h4p_info *info)
> +{
> + u16 lcr = 0;
> +
> + lcr = h4p_inb(info, UART_LCR);
> + h4p_outb(info, UART_LCR, 0xBF);
> + info->dll = h4p_inb(info, UART_DLL);
> + info->dlh = h4p_inb(info, UART_DLM);
> + info->efr = h4p_inb(info, UART_EFR);
> + h4p_outb(info, UART_LCR, lcr);
> + info->mdr1 = h4p_inb(info, UART_OMAP_MDR1);
> + info->ier = h4p_inb(info, UART_IER);
> +}
> +
> +void h4p_restore_regs(struct h4p_info *info)
> +{
> + u16 lcr = 0;
> +
> + h4p_init_uart(info);
> +
> + h4p_outb(info, UART_OMAP_MDR1, 7);
> + lcr = h4p_inb(info, UART_LCR);
> + h4p_outb(info, UART_LCR, 0xBF);
> + h4p_outb(info, UART_DLL, info->dll); /* Set speed */
> + h4p_outb(info, UART_DLM, info->dlh);
> + h4p_outb(info, UART_EFR, info->efr);
> + h4p_outb(info, UART_LCR, lcr);
> + h4p_outb(info, UART_OMAP_MDR1, info->mdr1);
> + h4p_outb(info, UART_IER, info->ier);
> +}
> +
> +void h4p_init_uart(struct h4p_info *info)
> +{
> + u8 mcr, efr;
> +
> + /* Enable and setup FIFO */
> + h4p_outb(info, UART_OMAP_MDR1, 0x00);
> +
> + h4p_outb(info, UART_LCR, 0xbf);
> + efr = h4p_inb(info, UART_EFR);
> + h4p_outb(info, UART_EFR, UART_EFR_ECB);
> + h4p_outb(info, UART_LCR, UART_LCR_DLAB);
> + mcr = h4p_inb(info, UART_MCR);
> + h4p_outb(info, UART_MCR, UART_MCR_TCRTLR);
> + h4p_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO |
> + UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
> + (3 << 6) | (0 << 4));
> + h4p_outb(info, UART_LCR, 0xbf);
> + h4p_outb(info, UART_TI752_TLR, 0xed);
> + h4p_outb(info, UART_TI752_TCR, 0xef);
> + h4p_outb(info, UART_EFR, efr);
> + h4p_outb(info, UART_LCR, UART_LCR_DLAB);
> + h4p_outb(info, UART_MCR, 0x00);
> + h4p_outb(info, UART_LCR, UART_LCR_WLEN8);
> + h4p_outb(info, UART_IER, UART_IER_RDI);
> + h4p_outb(info, UART_OMAP_SYSC, (1 << 0) | (1 << 2) | (2 << 3));
> +}

And you should run sparse before submitting patches.

CHECK drivers/bluetooth/nokia_core.c
drivers/bluetooth/nokia_core.c:130:6: warning: symbol 'h4p_enable_tx_nopm' was not declared. Should it be static?
drivers/bluetooth/nokia_core.c:282:23: warning: incorrect type in assignment (different base types)
drivers/bluetooth/nokia_core.c:282:23: expected unsigned short [unsigned] [usertype] baud
drivers/bluetooth/nokia_core.c:282:23: got restricted __le16 [usertype] <noident>
drivers/bluetooth/nokia_core.c:284:26: warning: incorrect type in assignment (different base types)
drivers/bluetooth/nokia_core.c:284:26: expected unsigned short [unsigned] [usertype] sys_clk
drivers/bluetooth/nokia_core.c:284:26: got restricted __le16 [usertype] <noident>

Regards

Marcel



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