[2/2] x86: pcengines apuv2 gpio/leds/keys platform driver

Message ID 1549559639-9447-2-git-send-email-info@metux.net
State New
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Series
  • [1/2] x86: gpio: AMD G-Series pch gpio platform driver
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Commit Message

Enrico Weigelt, metux IT consult Feb. 7, 2019, 5:13 p.m.
Driver for PCengines APUv2 board that supports GPIOs via AMD PCH
and attached LEDs and keys.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
---
 MAINTAINERS                            |   5 +
 drivers/platform/x86/Kconfig           |   9 ++
 drivers/platform/x86/Makefile          |   1 +
 drivers/platform/x86/pcengines-apuv2.c | 263 +++++++++++++++++++++++++++++++++
 4 files changed, 278 insertions(+)
 create mode 100644 drivers/platform/x86/pcengines-apuv2.c

Comments

Andy Shevchenko Feb. 7, 2019, 6:24 p.m. | #1
On Thu, Feb 7, 2019 at 7:14 PM Enrico Weigelt, metux IT consult
<info@metux.net> wrote:

Thanks for the patch, my comments below.

> Driver for PCengines APUv2 board that supports GPIOs via AMD PCH
> and attached LEDs and keys.

You should put here why ACPI can't be used for providing a necessary
information.
For example, 'The driver is targeting old platforms that do not have a
proper entry in ACPI tables for these devices. In new version of BIOS
this going to be fixed."

Besides same comments as per other patch in the series, can you tell
why it's not an MFD driver?

> +       depends on KEYBOARD_GPIO
> +       depends on KEYBOARD_GPIO_POLLED
> +       depends on LEDS_GPIO

Why?
Is any of this fatal to have driver not registered?


> +/* TODO
> +   * support apu1 board (different fch, different register layouts
> +   * add spinlocks
> +*/

Either remove this, or fix it properly. TODO is not going to be upstream.

> +#define FCH_ACPI_MMIO_BASE     0xFED80000
> +#define FCH_GPIO_OFFSET                0x1500
> +#define FCH_GPIO_SIZE          0x300

0x0300

> +#define GPIO_BASE              100
> +
> +#define GPIO_LED1              (GPIO_BASE+0)
> +#define GPIO_LED2              (GPIO_BASE+1)
> +#define GPIO_LED3              (GPIO_BASE+2)
> +#define GPIO_MODESW            (GPIO_BASE+3)
> +#define GPIO_SIMSWAP           (GPIO_BASE+4)

Have namespace issues.

> +static struct amd_fch_gpio_reg apu2_gpio_regs[] = {
> +       { 0x44 }, // GPIO_57 -- LED1
> +       { 0x45 }, // GPIO_58 -- LED2
> +       { 0x46 }, // GPIO_59 -- LED3
> +       { 0x59 }, // GPIO_32 -- LED4 -- GE32 -- #modesw
> +       { 0x5A }, // GPIO_33 -- LED5 -- GE33 -- simswap
> +       { 0x42 }, // GPIO_51 -- LED6
> +       { 0x43 }, // GPIO_55 -- LED7
> +       { 0x47 }, // GPIO_64 -- LED8
> +       { 0x48 }, // GPIO_68 -- LED9
> +       { 0x4C }, // GPIO_70 -- LED10

Keep it sorted and consider to use 'gpio-names' property.

> +};

> +static struct platform_device *apu_gpio_pdev = NULL;
> +static struct platform_device *apu_leds_pdev = NULL;
> +static struct platform_device *apu_keys_pdev = NULL;

Redundant assignments.

> +static int __init apu_gpio_init(void)
> +{
> +       int rc;

> +       const struct dmi_system_id *dmi = dmi_first_match(apu_gpio_dmi_table);

Split it to three lines.

const struct ... *id;

id = dmi_first_match(...);
if (!id)

> +       if (!dmi) {
> +               pr_err(KBUILD_MODNAME ": failed to detect apu board via dmi\n");
> +               return -ENODEV;
> +       }

> +                       -1,                                     /* id */

PLATFORM_DEVID_NONE ?

> +fail:
> +       if (!IS_ERR(apu_keys_pdev))
> +               platform_device_unregister(apu_keys_pdev);
> +       if (!IS_ERR(apu_leds_pdev))
> +               platform_device_unregister(apu_leds_pdev);
> +       if (!IS_ERR(apu_gpio_pdev))
> +               platform_device_unregister(apu_gpio_pdev);

So, why the failure of the registration of any of these devices is fatal?

> +}

> +static void __exit apu_gpio_exit(void)
> +{

> +       if (!IS_ERR(apu_keys_pdev))

Redundant.
See commit 99fef587ff98 ("driver core: platform: Respect return code
of platform_device_register_full()") for the details.

> +               platform_device_unregister(apu_keys_pdev);
> +       if (!IS_ERR(apu_leds_pdev))
> +               platform_device_unregister(apu_leds_pdev);
> +       if (!IS_ERR(apu_gpio_pdev))
> +               platform_device_unregister(apu_gpio_pdev);
> +}

> +MODULE_LICENSE("GPL");

License mismatch.

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index a693f39..2bdc975 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11515,6 +11515,11 @@  F:	lib/parman.c
 F:	lib/test_parman.c
 F:	include/linux/parman.h
 
+PC ENGINES APU BOARD DRIVER
+M:	Enrico Weigelt, metux IT consult <info@metux.net>
+S:	Maintained
+F:	drivers/platform/x86/pcengines-apuv2.c
+
 PC87360 HARDWARE MONITORING DRIVER
 M:	Jim Cromie <jim.cromie@gmail.com>
 L:	linux-hwmon@vger.kernel.org
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index b5e9db8..e424643 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1303,6 +1303,15 @@  config HUAWEI_WMI
 	  To compile this driver as a module, choose M here: the module
 	  will be called huawei-wmi.
 
+config PCENGINES_APU2
+	tristate "LEDs and buttons driver forPC Engines APUv2 board"
+	depends on GPIO_AMD_FCH
+	depends on KEYBOARD_GPIO
+	depends on KEYBOARD_GPIO_POLLED
+	depends on LEDS_GPIO
+	---help---
+	  This options adds APUv2 board support for LEDs and keys
+
 endif # X86_PLATFORM_DEVICES
 
 config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index ce8da26..86cb766 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -96,3 +96,4 @@  obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
 obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN)	+= intel_chtdc_ti_pwrbtn.o
 obj-$(CONFIG_I2C_MULTI_INSTANTIATE)	+= i2c-multi-instantiate.o
 obj-$(CONFIG_INTEL_ATOMISP2_PM)	+= intel_atomisp2_pm.o
+obj-$(CONFIG_PCENGINES_APU2)	+= pcengines-apuv2.o
diff --git a/drivers/platform/x86/pcengines-apuv2.c b/drivers/platform/x86/pcengines-apuv2.c
new file mode 100644
index 0000000..9bb89d6
--- /dev/null
+++ b/drivers/platform/x86/pcengines-apuv2.c
@@ -0,0 +1,263 @@ 
+/*
+ * PC-Engines APUv2 board platform driver for gpio buttons and LEDs
+ *
+ * Copyright (C) 2018 metux IT consult
+ * Author: Enrico Weigelt <info@metux.net>
+ */
+
+// SPDX-License-Identifier: GPL+
+
+#include <linux/dmi.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/gpio_keys.h>
+#include <linux/input.h>
+#include <linux/platform_data/x86/amd-fch-gpio-pdata.h>
+
+/* TODO
+   * support apu1 board (different fch, different register layouts
+   * add spinlocks
+*/
+
+#define FCH_ACPI_MMIO_BASE	0xFED80000
+#define FCH_GPIO_OFFSET		0x1500
+#define FCH_GPIO_SIZE		0x300
+
+#define GPIO_BASE		100
+
+#define GPIO_LED1		(GPIO_BASE+0)
+#define GPIO_LED2		(GPIO_BASE+1)
+#define GPIO_LED3		(GPIO_BASE+2)
+#define GPIO_MODESW		(GPIO_BASE+3)
+#define GPIO_SIMSWAP		(GPIO_BASE+4)
+
+struct board_data {
+	const char		*name;
+	struct resource		res;
+	int			gpio_num;
+	int			gpio_base;
+	struct amd_fch_gpio_reg	*gpio_regs;
+};
+
+static const struct gpio_led apu2_leds[] /* __initconst */ = {
+	{ .name = "apu:green:1", .gpio = GPIO_LED1, .active_low = 1, },
+	{ .name = "apu:green:2", .gpio = GPIO_LED2, .active_low = 1, },
+	{ .name = "apu:green:3", .gpio = GPIO_LED3, .active_low = 1, }
+};
+
+static const struct gpio_led_platform_data apu2_leds_pdata /* __initconst */ = {
+	.num_leds	= ARRAY_SIZE(apu2_leds),
+	.leds		= apu2_leds,
+};
+
+static struct amd_fch_gpio_reg apu2_gpio_regs[] = {
+	{ 0x44 }, // GPIO_57 -- LED1
+	{ 0x45 }, // GPIO_58 -- LED2
+	{ 0x46 }, // GPIO_59 -- LED3
+	{ 0x59 }, // GPIO_32 -- LED4 -- GE32 -- #modesw
+	{ 0x5A }, // GPIO_33 -- LED5 -- GE33 -- simswap
+	{ 0x42 }, // GPIO_51 -- LED6
+	{ 0x43 }, // GPIO_55 -- LED7
+	{ 0x47 }, // GPIO_64 -- LED8
+	{ 0x48 }, // GPIO_68 -- LED9
+	{ 0x4C }, // GPIO_70 -- LED10
+};
+
+static struct gpio_keys_button apu2_keys_buttons[] = {
+	{
+		.code			= KEY_A,
+		.gpio			= GPIO_MODESW,
+		.active_low		= 1,
+		.desc			= "modeswitch",
+		.type			= EV_KEY, /* or EV_SW ? */
+		.debounce_interval	= 10,
+		.value			= 1,
+	}
+};
+
+static const struct gpio_keys_platform_data apu2_keys_pdata = {
+	.buttons	= apu2_keys_buttons,
+	.nbuttons	= ARRAY_SIZE(apu2_keys_buttons),
+	.poll_interval	= 100,
+	.rep		= 0,
+	.name		= "apu2-keys",
+};
+
+static const struct amd_fch_gpio_pdata board_apu2 = {
+	.res		= DEFINE_RES_MEM_NAMED(FCH_ACPI_MMIO_BASE + FCH_GPIO_OFFSET,
+					       FCH_GPIO_SIZE,
+					       "apu2-gpio-iomem"),
+	.gpio_num	= ARRAY_SIZE(apu2_gpio_regs),
+	.gpio_reg	= apu2_gpio_regs,
+	.gpio_base	= GPIO_BASE,
+};
+
+/* note: matching works on string prefix, so "apu2" must come before "apu" */
+static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
+
+	/* APU2 w/ legacy bios < 4.0.8 */
+	{
+		.ident		= "apu2",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "APU2")
+		},
+		.driver_data	= (void*)&board_apu2,
+	},
+	/* APU2 w/ legacy bios >= 4.0.8 */
+	{
+		.ident		= "apu2",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "apu2")
+		},
+		.driver_data	= (void*)&board_apu2,
+	},
+	/* APU2 w/ maainline bios */
+	{
+		.ident		= "apu2",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
+		},
+		.driver_data	= (void*)&board_apu2,
+	},
+
+	/* APU3 w/ legacy bios < 4.0.8 */
+	{
+		.ident		= "apu3",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "APU3")
+		},
+		.driver_data = (void*)&board_apu2,
+	},
+	/* APU3 w/ legacy bios >= 4.0.8 */
+	{
+		.ident       = "apu3",
+		.matches     = {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "apu3")
+		},
+		.driver_data = (void*)&board_apu2,
+	},
+	/* APU3 w/ mainline bios */
+	{
+		.ident       = "apu3",
+		.matches     = {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
+		},
+		.driver_data = (void*)&board_apu2,
+	},
+
+	/* APU1 */
+	/* not supported yet - the register set is pretty different
+	{
+		.ident       = "apu",
+		.matches     = {
+			DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "APU")
+		},
+		.driver_data = (void*)&board_apu1,
+	},
+	*/
+	{}
+};
+
+static struct platform_device *apu_gpio_pdev = NULL;
+static struct platform_device *apu_leds_pdev = NULL;
+static struct platform_device *apu_keys_pdev = NULL;
+
+static int __init apu_gpio_init(void)
+{
+	int rc;
+	const struct dmi_system_id *dmi = dmi_first_match(apu_gpio_dmi_table);
+
+	if (!dmi) {
+		pr_err(KBUILD_MODNAME ": failed to detect apu board via dmi\n");
+		return -ENODEV;
+	}
+
+	pr_info(KBUILD_MODNAME ": registering gpio\n");
+	if (IS_ERR(apu_gpio_pdev = platform_device_register_resndata(
+			NULL,					/* parent */
+			AMD_FCH_GPIO_DRIVER_NAME,		/* name */
+			-1,					/* id */
+			NULL,					/* res */
+			0,					/* res_num */
+			dmi->driver_data,			/* platform_data */
+			sizeof(struct amd_fch_gpio_pdata)))) {
+		pr_err(KBUILD_MODNAME ": failed registering gpio device\n");
+		rc = PTR_ERR(apu_gpio_pdev);
+		goto fail;
+	}
+
+	pr_info(KBUILD_MODNAME ": registering leds\n");
+	if (IS_ERR(apu_leds_pdev = platform_device_register_resndata(
+			NULL,					/* parent */
+			"leds-gpio",				/* driver name */
+			-1,					/* id */
+			NULL,					/* res */
+			0,					/* ren_num */
+			&apu2_leds_pdata,			/* platform data */
+			sizeof(apu2_leds_pdata)))) {
+		pr_err(KBUILD_MODNAME ": failed registering leds device\n");
+		rc = PTR_ERR(apu_leds_pdev);
+		goto fail;
+	}
+
+	pr_info(KBUILD_MODNAME ": registering keys\n");
+	if (IS_ERR(apu_keys_pdev = platform_device_register_resndata(
+			NULL,					/* parent */
+			"gpio-keys-polled",			/* driver name */
+			-1,					/* id */
+			NULL,					/* res */
+			0,					/* res_num */
+			&apu2_keys_pdata,			/* platform_data */
+			sizeof(apu2_keys_pdata)))) {
+		pr_err(KBUILD_MODNAME ": failed registering keys device\n");
+		rc = PTR_ERR(apu_keys_pdev);
+		goto fail;
+	}
+
+	pr_info(KBUILD_MODNAME ": initialized: gpio, leds, keys\n");
+	return 0;
+
+fail:
+	if (!IS_ERR(apu_keys_pdev))
+		platform_device_unregister(apu_keys_pdev);
+	if (!IS_ERR(apu_leds_pdev))
+		platform_device_unregister(apu_leds_pdev);
+	if (!IS_ERR(apu_gpio_pdev))
+		platform_device_unregister(apu_gpio_pdev);
+
+	pr_err(KBUILD_MODNAME ": probe FAILED: %d\n", rc);
+	return rc;
+}
+
+static void __exit apu_gpio_exit(void)
+{
+	if (!IS_ERR(apu_keys_pdev))
+		platform_device_unregister(apu_keys_pdev);
+	if (!IS_ERR(apu_leds_pdev))
+		platform_device_unregister(apu_leds_pdev);
+	if (!IS_ERR(apu_gpio_pdev))
+		platform_device_unregister(apu_gpio_pdev);
+}
+
+module_init(apu_gpio_init);
+module_exit(apu_gpio_exit);
+
+MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
+MODULE_DESCRIPTION("PC Engines APUv2 board GPIO/LED/keys driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
+MODULE_ALIAS("platform:apu-board");
+MODULE_SOFTDEP("pre: gpio_amd_fch");
+MODULE_SOFTDEP("pre: gpio_keys");
+MODULE_SOFTDEP("pre: gpio_keys_polled");