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Date: Mon, 8 Apr 2019 12:02:18 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Thomas Bogendoerfer <tbogendoerfer@...e.de>
Cc: Ralf Baechle <ralf@...ux-mips.org>,
Paul Burton <paul.burton@...s.com>,
James Hogan <jhogan@...nel.org>,
Lee Jones <lee.jones@...aro.org>,
"David S. Miller" <davem@...emloft.net>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.com>, linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
netdev@...r.kernel.org, linux-rtc@...r.kernel.org,
linux-serial@...r.kernel.org
Subject: Re: [PATCH 6/6] Input: add IOC3 serio driver
Hi Thomas,
On Mon, Apr 08, 2019 at 04:20:58PM +0200, Thomas Bogendoerfer wrote:
> This patch adds a platform driver for supporting keyboard and mouse
> interface of SGI IOC3 chips.
>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> ---
> drivers/input/serio/Kconfig | 12 +++
> drivers/input/serio/Makefile | 1 +
> drivers/input/serio/ioc3kbd.c | 183 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 196 insertions(+)
> create mode 100644 drivers/input/serio/ioc3kbd.c
>
> diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
> index c9c7224d5ae0..ceb89d8b785d 100644
> --- a/drivers/input/serio/Kconfig
> +++ b/drivers/input/serio/Kconfig
> @@ -164,6 +164,18 @@ config SERIO_MACEPS2
> To compile this driver as a module, choose M here: the
> module will be called maceps2.
>
> +config SERIO_SGI_IOC3
> + tristate "SGI IOC3 PS/2 controller"
> + depends on SGI_MFD_IOC3
> + help
> + Say Y here if you have an SGI Onyx2, SGI Octane or IOC3 PCI card
> + and you want to attach and use a keyboard, mouse, or both.
> +
> + Do not use on an SGI Origin 2000, as the IO6 board in those
> + systems lacks the necessary PS/2 ports. You will need to add
> + an IOC3 PCI card (CADduo) via a PCI Shoehorn XIO card or the
> + PCI Cardcage (shoebox) first.
To compile this driver as a module...
> +
> config SERIO_LIBPS2
> tristate "PS/2 driver library"
> depends on SERIO_I8042 || SERIO_I8042=n
> diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
> index 67950a5ccb3f..6d97bad7b844 100644
> --- a/drivers/input/serio/Makefile
> +++ b/drivers/input/serio/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_HIL_MLC) += hp_sdc_mlc.o hil_mlc.o
> obj-$(CONFIG_SERIO_PCIPS2) += pcips2.o
> obj-$(CONFIG_SERIO_PS2MULT) += ps2mult.o
> obj-$(CONFIG_SERIO_MACEPS2) += maceps2.o
> +obj-$(CONFIG_SERIO_SGI_IOC3) += ioc3kbd.o
> obj-$(CONFIG_SERIO_LIBPS2) += libps2.o
> obj-$(CONFIG_SERIO_RAW) += serio_raw.o
> obj-$(CONFIG_SERIO_AMS_DELTA) += ams_delta_serio.o
> diff --git a/drivers/input/serio/ioc3kbd.c b/drivers/input/serio/ioc3kbd.c
> new file mode 100644
> index 000000000000..8ff46a9f3d98
> --- /dev/null
> +++ b/drivers/input/serio/ioc3kbd.c
> @@ -0,0 +1,183 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * SGI IOC3 PS/2 controller driver for linux
> + *
> + * Copyright (C) 2019 Thomas Bogendoerfer <tbogendoerfer@...e.de>
> + *
> + * Based on code Copyright (C) 2005 Stanislaw Skowronek <skylark@...ligned.org>
> + * Copyright (C) 2009 Johannes Dickgreber <tanzy@....de>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/serio.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <asm/sn/ioc3.h>
> +
> +struct ioc3kbd_data {
> + struct ioc3_serioregs __iomem *regs;
> + struct serio *kbd, *aux;
> +};
> +
> +static int ioc3kbd_write(struct serio *dev, u8 val)
> +{
> + struct ioc3kbd_data *d = (struct ioc3kbd_data *)(dev->port_data);
serio->port_data is void pointer, no need to cast.
> + unsigned long timeout = 0;
> + u32 mask;
> +
> + mask = (dev == d->aux) ? KM_CSR_M_WRT_PEND : KM_CSR_K_WRT_PEND;
> + while ((readl(&d->regs->km_csr) & mask) && (timeout < 1000)) {
> + udelay(100);
> + timeout++;
> + }
> +
> + if (dev == d->aux)
> + writel(((u32)val) & 0x000000ff, &d->regs->m_wd);
> + else
> + writel(((u32)val) & 0x000000ff, &d->regs->k_wd);
Why do you need to mask the upper bits if you start with u8? Can you
just say:
writel(val, dev == d->aux ? &d->regs->m_wd, &d->regs->k_wd);
> +
> + if (timeout >= 1000)
> + return -1;
So you attempt to write even if controller indicates that it is busy?
> + return 0;
> +}
> +
> +static irqreturn_t ioc3kbd_intr(int itq, void *dev_id)
> +{
> + struct ioc3kbd_data *d = dev_id;
> + u32 data_k, data_m;
> +
> + data_k = readl(&d->regs->k_rd);
> + data_m = readl(&d->regs->m_rd);
> +
> + if (data_k & KM_RD_VALID_0)
> + serio_interrupt(d->kbd,
> + (data_k >> KM_RD_DATA_0_SHIFT) & 0xff, 0);
> + if (data_k & KM_RD_VALID_1)
> + serio_interrupt(d->kbd,
> + (data_k >> KM_RD_DATA_1_SHIFT) & 0xff, 0);
> + if (data_k & KM_RD_VALID_2)
> + serio_interrupt(d->kbd,
> + (data_k >> KM_RD_DATA_2_SHIFT) & 0xff, 0);
> + if (data_m & KM_RD_VALID_0)
> + serio_interrupt(d->aux,
> + (data_m >> KM_RD_DATA_0_SHIFT) & 0xff, 0);
> + if (data_m & KM_RD_VALID_1)
> + serio_interrupt(d->aux,
> + (data_m >> KM_RD_DATA_1_SHIFT) & 0xff, 0);
> + if (data_m & KM_RD_VALID_2)
> + serio_interrupt(d->aux,
> + (data_m >> KM_RD_DATA_2_SHIFT) & 0xff, 0);
> +
> + return 0;
> +}
> +
> +static int ioc3kbd_open(struct serio *dev)
> +{
> + return 0;
> +}
> +
> +static void ioc3kbd_close(struct serio *dev)
> +{
> + /* Empty */
> +}
You do not need empty stubs.
> +
> +static struct ioc3kbd_data *ioc3kbd_alloc_port(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct ioc3_serioregs __iomem *regs;
> + struct ioc3kbd_data *d;
> + struct serio *sk, *sa;
> + struct resource *mem;
> + int irq;
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem)
> + return NULL;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return NULL;
> +
> + regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
> + if (!regs)
> + return NULL;
> +
> + sk = devm_kzalloc(dev, sizeof(struct serio), GFP_KERNEL);
> + if (!sk)
> + return NULL;
> +
> + sa = devm_kzalloc(dev, sizeof(struct serio), GFP_KERNEL);
> + if (!sa)
> + return NULL;
serio ports are refcounted, they must not be allocated with devm_* API
as their lifetime may extend past the remove() time.
> +
> + d = devm_kzalloc(dev, sizeof(struct ioc3kbd_data),
> + GFP_KERNEL);
> + if (!d)
> + return NULL;
> +
> + if (request_irq(irq, ioc3kbd_intr, IRQF_SHARED, "ioc3-kbd", d))
> + return NULL;
This is unfortunate that you lose error code. You also fail to handle
-EPROPE_DEFER from request_irq().
> +
> + sk->id.type = SERIO_8042;
> + sk->write = ioc3kbd_write;
> + sk->open = ioc3kbd_open;
> + sk->close = ioc3kbd_close;
> + snprintf(sk->name, sizeof(sk->name), "IOC3 keyboard %d", pdev->id);
> + snprintf(sk->phys, sizeof(sk->phys), "ioc3/serio%dkbd", pdev->id);
> + sk->port_data = d;
> + sk->dev.parent = &pdev->dev;
> +
> + sa->id.type = SERIO_8042;
> + sa->write = ioc3kbd_write;
> + sa->open = ioc3kbd_open;
> + sa->close = ioc3kbd_close;
> + snprintf(sa->name, sizeof(sa->name), "IOC3 auxiliary %d", pdev->id);
> + snprintf(sa->phys, sizeof(sa->phys), "ioc3/serio%daux", pdev->id);
> + sa->port_data = d;
> + sa->dev.parent = dev;
> +
> + d->regs = regs;
> + d->kbd = sk;
> + d->aux = sa;
> + return d;
> +}
> +
> +static int ioc3kbd_probe(struct platform_device *pdev)
> +{
> + struct ioc3kbd_data *d;
> +
> + d = ioc3kbd_alloc_port(pdev);
> + if (!d)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, d);
> + serio_register_port(d->kbd);
> + serio_register_port(d->aux);
> +
> + return 0;
> +}
> +
> +static int ioc3kbd_remove(struct platform_device *pdev)
> +{
> + struct ioc3kbd_data *d = platform_get_drvdata(pdev);
> +
> + serio_unregister_port(d->kbd);
> + serio_unregister_port(d->aux);
> + return 0;
> +}
> +
> +static struct platform_driver ioc3kbd_driver = {
> + .probe = ioc3kbd_probe,
> + .remove = ioc3kbd_remove,
> + .driver = {
> + .name = "ioc3-kbd",
> + },
> +};
> +module_platform_driver(ioc3kbd_driver);
> +
> +MODULE_AUTHOR("Stanislaw Skowronek <skylark@...ligned.org>");
> +MODULE_DESCRIPTION("SGI IOC3 serio driver");
> +MODULE_LICENSE("GPL");
"GPL v2" to match SPDX header?
> --
> 2.13.7
>
Thanks.
--
Dmitry
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