* [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
@ 2016-12-19 0:12 ` Hans de Goede
2016-12-19 1:57 ` kbuild test robot
` (3 more replies)
0 siblings, 4 replies; 8+ messages in thread
From: Hans de Goede @ 2016-12-19 0:12 UTC (permalink / raw)
To: MyungJoo Ham, Chanwoo Choi; +Cc: linux-kernel, David Cohen, Hans de Goede
From: David Cohen <david.a.cohen@intel.com>
Add an exntcon driver to for USB OTG ports controlled by 3 GPIOs used on
Intel Baytrail and Cherrytrail tablets.
Signed-off-by: David Cohen <david.a.cohen@intel.com>
[hdgoede@redhat.com: Port to current kernel, submit upstream]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/extcon/Kconfig | 7 ++
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-3gpio_otg.c | 201 ++++++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+)
create mode 100644 drivers/extcon/extcon-3gpio_otg.c
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 04788d9..1aaa64f 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -14,6 +14,13 @@ if EXTCON
comment "Extcon Device Drivers"
+config EXTCON_3GPIO_OTG
+ tristate "3 GPIO USB OTG extcon driver"
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ Say Y here to enable extcon support for USB OTG ports controlled
+ by 3 GPIOs used on Intel Baytrail and Cherrytrail tablets.
+
config EXTCON_ADC_JACK
tristate "ADC Jack extcon support"
depends on IIO
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 31a0a99..aa646fd 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -4,6 +4,7 @@
obj-$(CONFIG_EXTCON) += extcon-core.o
extcon-core-objs += extcon.o devres.o
+obj-$(CONFIG_EXTCON_3GPIO_OTG) += extcon-3gpio_otg.o
obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
diff --git a/drivers/extcon/extcon-3gpio_otg.c b/drivers/extcon/extcon-3gpio_otg.c
new file mode 100644
index 0000000..fc8b14d1
--- /dev/null
+++ b/drivers/extcon/extcon-3gpio_otg.c
@@ -0,0 +1,201 @@
+/*
+ * 3 GPIO USB OTG extcon driver
+ *
+ * Copyright (c) 2016) Hans de Goede <hdegoede@redhat.com>
+ *
+ * Based on android x86 kernel code which is:
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ * Author: David Cohen <david.a.cohen@linux.intel.com>
+ *
+ * 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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/extcon.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "usb_otg_port"
+#define USB_OTG_GPIO_USB_ID 0
+#define USB_OTG_GPIO_VBUS_EN 1
+#define USB_OTG_GPIO_USB_MUX 2
+#define DEBOUNCE_TIME msecs_to_jiffies(50)
+
+struct usb_otg {
+ struct device *dev;
+ struct extcon_dev *edev;
+ struct delayed_work work;
+ struct gpio_desc *gpio_usb_id;
+ struct gpio_desc *gpio_vbus_en;
+ struct gpio_desc *gpio_usb_mux;
+ int usb_id_irq;
+};
+
+static const unsigned int usb_otg_cable[] = {
+ EXTCON_USB_HOST,
+ EXTCON_NONE,
+};
+
+/*
+ * If id == 1, USB port should be set to peripheral
+ * if id == 0, USB port should be set to host
+ *
+ * Peripheral: set USB mux to peripheral and disable VBUS
+ * Host: set USB mux to host and enable VBUS
+ */
+static void usb_otg_set_port(struct usb_otg *otg, int id)
+{
+ int mux_val = id;
+ int vbus_val = !id;
+
+ if (!IS_ERR(otg->gpio_usb_mux))
+ gpiod_direction_output(otg->gpio_usb_mux, mux_val);
+
+ if (!IS_ERR(otg->gpio_vbus_en))
+ gpiod_direction_output(otg->gpio_vbus_en, vbus_val);
+}
+
+static void usb_otg_do_usb_id(struct work_struct *work)
+{
+ struct usb_otg *otg =
+ container_of(work, struct usb_otg, work.work);
+ int id = gpiod_get_value_cansleep(otg->gpio_usb_id);
+
+ dev_info(otg->dev, "USB PORT ID: %s\n", id ? "PERIPHERAL" : "HOST");
+
+ /*
+ * id == 1: PERIPHERAL
+ * id == 0: HOST
+ */
+ usb_otg_set_port(otg, id);
+
+ /*
+ * id == 0: HOST connected
+ * id == 1: Host disconnected
+ */
+ extcon_set_state_sync(otg->edev, EXTCON_USB_HOST, !id);
+}
+
+static irqreturn_t usb_otg_thread_isr(int irq, void *priv)
+{
+ struct usb_otg *otg = priv;
+
+ /* id changed, let the pin settle and then process it */
+ mod_delayed_work(system_wq, &otg->work, DEBOUNCE_TIME);
+
+ return IRQ_HANDLED;
+}
+
+static int usb_otg_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_otg *otg;
+ int ret;
+
+ otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
+ if (!otg)
+ return -ENOMEM;
+
+ otg->dev = dev;
+ INIT_DELAYED_WORK(&otg->work, usb_otg_do_usb_id);
+
+ otg->gpio_usb_id = devm_gpiod_get_index(dev, "id",
+ USB_OTG_GPIO_USB_ID,
+ GPIOD_IN);
+ if (IS_ERR(otg->gpio_usb_id)) {
+ dev_err(dev, "can't request USB ID GPIO: ret = %ld\n",
+ PTR_ERR(otg->gpio_usb_id));
+ return PTR_ERR(otg->gpio_usb_id);
+ }
+
+ otg->usb_id_irq = gpiod_to_irq(otg->gpio_usb_id);
+ if (otg->usb_id_irq <= 0) {
+ dev_err(dev, "invalid USB ID IRQ: %d\n", otg->usb_id_irq);
+ return -EINVAL;
+ }
+
+ otg->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
+ USB_OTG_GPIO_VBUS_EN,
+ GPIOD_ASIS);
+ if (IS_ERR(otg->gpio_vbus_en))
+ dev_info(dev, "can't request VBUS EN GPIO, skipping it.\n");
+
+ otg->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
+ USB_OTG_GPIO_USB_MUX,
+ GPIOD_ASIS);
+ if (IS_ERR(otg->gpio_usb_mux))
+ dev_info(dev, "can't request USB MUX, skipping it.\n");
+
+ /* register extcon device */
+ otg->edev = devm_extcon_dev_allocate(dev, usb_otg_cable);
+ if (IS_ERR(otg->edev)) {
+ dev_err(dev, "failed to allocate extcon device\n");
+ return -ENOMEM;
+ }
+
+ ret = devm_extcon_dev_register(dev, otg->edev);
+ if (ret < 0) {
+ dev_err(dev, "failed to register extcon device: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(dev, otg->usb_id_irq,
+ NULL, usb_otg_thread_isr,
+ IRQF_SHARED | IRQF_ONESHOT |
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ dev_name(dev), otg);
+ if (ret < 0) {
+ dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
+ return ret;
+ }
+
+ /* queue initial processing of id-pin */
+ queue_delayed_work(system_wq, &otg->work, 0);
+
+ platform_set_drvdata(pdev, otg);
+
+ return 0;
+}
+
+static int usb_otg_remove(struct platform_device *pdev)
+{
+ struct usb_otg *otg = platform_get_drvdata(pdev);
+
+ devm_free_irq(&pdev->dev, otg->usb_id_irq, otg);
+ cancel_delayed_work_sync(&otg->work);
+
+ return 0;
+}
+
+static struct acpi_device_id usb_otg_acpi_match[] = {
+ { "INT3496" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
+
+static struct platform_driver usb_otg_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
+ },
+ .probe = usb_otg_probe,
+ .remove = usb_otg_remove,
+};
+
+module_platform_driver(usb_otg_driver);
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
+MODULE_LICENSE("GPL");
--
2.9.3
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 0:12 ` Hans de Goede
@ 2016-12-19 1:57 ` kbuild test robot
2016-12-19 2:01 ` [PATCH] extcon: 3gpio: fix platform_no_drv_owner.cocci warnings kbuild test robot
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: kbuild test robot @ 2016-12-19 1:57 UTC (permalink / raw)
To: Hans de Goede
Cc: kbuild-all, MyungJoo Ham, Chanwoo Choi, linux-kernel,
David Cohen, Hans de Goede
[-- Attachment #1: Type: text/plain, Size: 9809 bytes --]
Hi David,
[auto build test WARNING on chanwoo-extcon/extcon-next]
[also build test WARNING on v4.9 next-20161216]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Hans-de-Goede/extcon-3gpio-add-driver-for-USB-OTG-port-controlled-by-3-GPIOs/20161219-082834
base: https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git extcon-next
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=alpha
All warnings (new ones prefixed by >>):
drivers/extcon/extcon-3gpio_otg.c:185:1: warning: data definition has no type or storage class
MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
^~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:185:1: error: type defaults to 'int' in declaration of 'MODULE_DEVICE_TABLE' [-Werror=implicit-int]
drivers/extcon/extcon-3gpio_otg.c:185:1: warning: parameter names (without types) in function declaration
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
include/linux/device.h:1353:1: warning: data definition has no type or storage class
module_init(__driver##_init); \
^
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
include/linux/device.h:1353:1: error: type defaults to 'int' in declaration of 'module_init' [-Werror=implicit-int]
module_init(__driver##_init); \
^
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/linkage.h:6:0,
from include/linux/kernel.h:6,
from include/linux/list.h:8,
from include/linux/resource_ext.h:17,
from include/linux/acpi.h:26,
from drivers/extcon/extcon-3gpio_otg.c:21:
>> include/linux/export.h:37:30: warning: parameter names (without types) in function declaration
#define THIS_MODULE ((struct module *)0)
^
>> include/linux/platform_device.h:198:34: note: in expansion of macro 'THIS_MODULE'
__platform_driver_register(drv, THIS_MODULE)
^~~~~~~~~~~
>> include/linux/device.h:1351:9: note: in expansion of macro 'platform_driver_register'
return __register(&(__driver) , ##__VA_ARGS__); \
^~~~~~~~~~
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
include/linux/device.h:1358:1: warning: data definition has no type or storage class
module_exit(__driver##_exit);
^
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
include/linux/device.h:1358:1: error: type defaults to 'int' in declaration of 'module_exit' [-Werror=implicit-int]
module_exit(__driver##_exit);
^
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/linkage.h:6:0,
from include/linux/kernel.h:6,
from include/linux/list.h:8,
from include/linux/resource_ext.h:17,
from include/linux/acpi.h:26,
from drivers/extcon/extcon-3gpio_otg.c:21:
>> include/linux/export.h:37:30: warning: parameter names (without types) in function declaration
#define THIS_MODULE ((struct module *)0)
^
>> include/linux/platform_device.h:198:34: note: in expansion of macro 'THIS_MODULE'
__platform_driver_register(drv, THIS_MODULE)
^~~~~~~~~~~
>> include/linux/device.h:1351:9: note: in expansion of macro 'platform_driver_register'
return __register(&(__driver) , ##__VA_ARGS__); \
^~~~~~~~~~
include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:199:15: error: expected declaration specifiers or '...' before string constant
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:200:20: error: expected declaration specifiers or '...' before string constant
MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:201:16: error: expected declaration specifiers or '...' before string constant
MODULE_LICENSE("GPL");
^~~~~
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
drivers/extcon/extcon-3gpio_otg.c:197:24: warning: 'usb_otg_driver_init' defined but not used [-Wunused-function]
module_platform_driver(usb_otg_driver);
^
include/linux/device.h:1349:19: note: in definition of macro 'module_driver'
static int __init __driver##_init(void) \
^~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:181:30: warning: 'usb_otg_acpi_match' defined but not used [-Wunused-variable]
static struct acpi_device_id usb_otg_acpi_match[] = {
^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/THIS_MODULE +198 include/linux/platform_device.h
00d3dcdd Russell King 2005-11-09 182 int (*remove)(struct platform_device *);
00d3dcdd Russell King 2005-11-09 183 void (*shutdown)(struct platform_device *);
00d3dcdd Russell King 2005-11-09 184 int (*suspend)(struct platform_device *, pm_message_t state);
00d3dcdd Russell King 2005-11-09 185 int (*resume)(struct platform_device *);
00d3dcdd Russell King 2005-11-09 186 struct device_driver driver;
831fad2f Uwe Kleine-König 2010-01-26 187 const struct platform_device_id *id_table;
3f9120b0 Johan Hovold 2013-09-23 188 bool prevent_deferred_probe;
00d3dcdd Russell King 2005-11-09 189 };
00d3dcdd Russell King 2005-11-09 190
10dbc5e3 Rob Herring 2013-04-21 191 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
10dbc5e3 Rob Herring 2013-04-21 192 driver))
10dbc5e3 Rob Herring 2013-04-21 193
9447057e Libo Chen 2013-05-25 194 /*
9447057e Libo Chen 2013-05-25 195 * use a macro to avoid include chaining to get THIS_MODULE
9447057e Libo Chen 2013-05-25 196 */
9447057e Libo Chen 2013-05-25 197 #define platform_driver_register(drv) \
9447057e Libo Chen 2013-05-25 @198 __platform_driver_register(drv, THIS_MODULE)
9447057e Libo Chen 2013-05-25 199 extern int __platform_driver_register(struct platform_driver *,
9447057e Libo Chen 2013-05-25 200 struct module *);
00d3dcdd Russell King 2005-11-09 201 extern void platform_driver_unregister(struct platform_driver *);
00d3dcdd Russell King 2005-11-09 202
c67334fb David Brownell 2006-11-16 203 /* non-hotpluggable platform devices may use this so that probe() and
c67334fb David Brownell 2006-11-16 204 * its support may live in __init sections, conserving runtime memory.
c67334fb David Brownell 2006-11-16 205 */
c3b50dc2 Wolfram Sang 2014-10-28 206 #define platform_driver_probe(drv, probe) \
:::::: The code at line 198 was first introduced by commit
:::::: 9447057eaff871dd7c63c808de761b8732407169 platform_device: use a macro instead of platform_driver_register
:::::: TO: Libo Chen <clbchenlibo.chen@huawei.com>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 47891 bytes --]
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH] extcon: 3gpio: fix platform_no_drv_owner.cocci warnings
2016-12-19 0:12 ` Hans de Goede
2016-12-19 1:57 ` kbuild test robot
@ 2016-12-19 2:01 ` kbuild test robot
2016-12-19 2:34 ` [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs kbuild test robot
2016-12-19 8:00 ` Chanwoo Choi
3 siblings, 0 replies; 8+ messages in thread
From: kbuild test robot @ 2016-12-19 2:01 UTC (permalink / raw)
To: Hans de Goede
Cc: kbuild-all, MyungJoo Ham, Chanwoo Choi, linux-kernel,
David Cohen, Hans de Goede
drivers/extcon/extcon-3gpio_otg.c:190:3-8: No need to set .owner here. The core will do it.
Remove .owner field if calls are used which set it automatically
Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci
CC: David Cohen <david.a.cohen@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
extcon-3gpio_otg.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/extcon/extcon-3gpio_otg.c
+++ b/drivers/extcon/extcon-3gpio_otg.c
@@ -187,7 +187,6 @@ MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_m
static struct platform_driver usb_otg_driver = {
.driver = {
.name = DRV_NAME,
- .owner = THIS_MODULE,
.acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
},
.probe = usb_otg_probe,
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 0:12 ` Hans de Goede
@ 2016-12-19 2:01 kbuild test robot
2016-12-19 0:12 ` Hans de Goede
3 siblings, 1 reply; 8+ messages in thread
From: kbuild test robot @ 2016-12-19 2:01 UTC (permalink / raw)
To: Hans de Goede
Cc: kbuild-all, MyungJoo Ham, Chanwoo Choi, linux-kernel,
David Cohen, Hans de Goede
Hi David,
[auto build test WARNING on chanwoo-extcon/extcon-next]
[also build test WARNING on v4.9 next-20161216]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Hans-de-Goede/extcon-3gpio-add-driver-for-USB-OTG-port-controlled-by-3-GPIOs/20161219-082834
base: https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git extcon-next
coccinelle warnings: (new ones prefixed by >>)
>> drivers/extcon/extcon-3gpio_otg.c:190:3-8: No need to set .owner here. The core will do it.
Please review and possibly fold the followup patch.
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 0:12 ` Hans de Goede
2016-12-19 1:57 ` kbuild test robot
2016-12-19 2:01 ` [PATCH] extcon: 3gpio: fix platform_no_drv_owner.cocci warnings kbuild test robot
@ 2016-12-19 2:34 ` kbuild test robot
2016-12-19 8:00 ` Chanwoo Choi
3 siblings, 0 replies; 8+ messages in thread
From: kbuild test robot @ 2016-12-19 2:34 UTC (permalink / raw)
To: Hans de Goede
Cc: kbuild-all, MyungJoo Ham, Chanwoo Choi, linux-kernel,
David Cohen, Hans de Goede
[-- Attachment #1: Type: text/plain, Size: 6560 bytes --]
Hi David,
[auto build test ERROR on chanwoo-extcon/extcon-next]
[also build test ERROR on v4.9 next-20161216]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Hans-de-Goede/extcon-3gpio-add-driver-for-USB-OTG-port-controlled-by-3-GPIOs/20161219-082834
base: https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git extcon-next
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=blackfin
All error/warnings (new ones prefixed by >>):
>> drivers/extcon/extcon-3gpio_otg.c:185:1: warning: data definition has no type or storage class
MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
^~~~~~~~~~~~~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:185:1: error: type defaults to 'int' in declaration of 'MODULE_DEVICE_TABLE' [-Werror=implicit-int]
>> drivers/extcon/extcon-3gpio_otg.c:185:1: warning: parameter names (without types) in function declaration
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
include/linux/device.h:1353:1: warning: data definition has no type or storage class
module_init(__driver##_init); \
^
>> include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
>> include/linux/device.h:1353:1: error: type defaults to 'int' in declaration of 'module_init' [-Werror=implicit-int]
module_init(__driver##_init); \
^
>> include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: warning: parameter names (without types) in function declaration
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
include/linux/device.h:1358:1: warning: data definition has no type or storage class
module_exit(__driver##_exit);
^
>> include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
>> include/linux/device.h:1358:1: error: type defaults to 'int' in declaration of 'module_exit' [-Werror=implicit-int]
module_exit(__driver##_exit);
^
>> include/linux/platform_device.h:228:2: note: in expansion of macro 'module_driver'
module_driver(__platform_driver, platform_driver_register, \
^~~~~~~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:1: warning: parameter names (without types) in function declaration
>> drivers/extcon/extcon-3gpio_otg.c:199:15: error: expected declaration specifiers or '...' before string constant
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:200:20: error: expected declaration specifiers or '...' before string constant
MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:201:16: error: expected declaration specifiers or '...' before string constant
MODULE_LICENSE("GPL");
^~~~~
In file included from include/linux/acpi.h:27:0,
from drivers/extcon/extcon-3gpio_otg.c:21:
drivers/extcon/extcon-3gpio_otg.c:197:24: warning: 'usb_otg_driver_exit' defined but not used [-Wunused-function]
module_platform_driver(usb_otg_driver);
^
include/linux/device.h:1354:20: note: in definition of macro 'module_driver'
static void __exit __driver##_exit(void) \
^~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:197:24: warning: 'usb_otg_driver_init' defined but not used [-Wunused-function]
module_platform_driver(usb_otg_driver);
^
include/linux/device.h:1349:19: note: in definition of macro 'module_driver'
static int __init __driver##_init(void) \
^~~~~~~~
>> drivers/extcon/extcon-3gpio_otg.c:197:1: note: in expansion of macro 'module_platform_driver'
module_platform_driver(usb_otg_driver);
^~~~~~~~~~~~~~~~~~~~~~
drivers/extcon/extcon-3gpio_otg.c:181:30: warning: 'usb_otg_acpi_match' defined but not used [-Wunused-variable]
static struct acpi_device_id usb_otg_acpi_match[] = {
^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +185 drivers/extcon/extcon-3gpio_otg.c
179 }
180
181 static struct acpi_device_id usb_otg_acpi_match[] = {
182 { "INT3496" },
183 { }
184 };
> 185 MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
186
187 static struct platform_driver usb_otg_driver = {
188 .driver = {
189 .name = DRV_NAME,
190 .owner = THIS_MODULE,
191 .acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
192 },
193 .probe = usb_otg_probe,
194 .remove = usb_otg_remove,
195 };
196
> 197 module_platform_driver(usb_otg_driver);
198
> 199 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
200 MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
201 MODULE_LICENSE("GPL");
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 41983 bytes --]
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 0:12 ` Hans de Goede
` (2 preceding siblings ...)
2016-12-19 2:34 ` [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs kbuild test robot
@ 2016-12-19 8:00 ` Chanwoo Choi
2016-12-19 8:57 ` Hans de Goede
3 siblings, 1 reply; 8+ messages in thread
From: Chanwoo Choi @ 2016-12-19 8:00 UTC (permalink / raw)
To: Hans de Goede, MyungJoo Ham; +Cc: linux-kernel, David Cohen
Hi Hans,
I'm glad to post new extcon driver. But, we need to discuss the device name of "3gpio".
I think that "3 GPIO" is ambiguous. You need to find more proper name. For example, extcon-qcom-spmi-misc.c uses one interrupt line to detect "USB_HOST". This driver name means the "Qualcomm USB extcon support".
Also, I recommend that you make the documentation for this driver.
On 2016년 12월 19일 09:12, Hans de Goede wrote:
> From: David Cohen <david.a.cohen@intel.com>
>
> Add an exntcon driver to for USB OTG ports controlled by 3 GPIOs used on
> Intel Baytrail and Cherrytrail tablets.
>
> Signed-off-by: David Cohen <david.a.cohen@intel.com>
> [hdgoede@redhat.com: Port to current kernel, submit upstream]
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/extcon/Kconfig | 7 ++
> drivers/extcon/Makefile | 1 +
> drivers/extcon/extcon-3gpio_otg.c | 201 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 209 insertions(+)
> create mode 100644 drivers/extcon/extcon-3gpio_otg.c
>
> diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
> index 04788d9..1aaa64f 100644
> --- a/drivers/extcon/Kconfig
> +++ b/drivers/extcon/Kconfig
> @@ -14,6 +14,13 @@ if EXTCON
>
> comment "Extcon Device Drivers"
>
> +config EXTCON_3GPIO_OTG
> + tristate "3 GPIO USB OTG extcon driver"
> + depends on GPIOLIB || COMPILE_TEST
> + help
> + Say Y here to enable extcon support for USB OTG ports controlled
> + by 3 GPIOs used on Intel Baytrail and Cherrytrail tablets.
> +
> config EXTCON_ADC_JACK
> tristate "ADC Jack extcon support"
> depends on IIO
> diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
> index 31a0a99..aa646fd 100644
> --- a/drivers/extcon/Makefile
> +++ b/drivers/extcon/Makefile
> @@ -4,6 +4,7 @@
>
> obj-$(CONFIG_EXTCON) += extcon-core.o
> extcon-core-objs += extcon.o devres.o
> +obj-$(CONFIG_EXTCON_3GPIO_OTG) += extcon-3gpio_otg.o
> obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
> obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
> obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
> diff --git a/drivers/extcon/extcon-3gpio_otg.c b/drivers/extcon/extcon-3gpio_otg.c
> new file mode 100644
> index 0000000..fc8b14d1
> --- /dev/null
> +++ b/drivers/extcon/extcon-3gpio_otg.c
> @@ -0,0 +1,201 @@
> +/*
> + * 3 GPIO USB OTG extcon driver
> + *
> + * Copyright (c) 2016) Hans de Goede <hdegoede@redhat.com>
s/2016) -> 2016
> + *
> + * Based on android x86 kernel code which is:
> + *
> + * Copyright (c) 2014, Intel Corporation.
> + * Author: David Cohen <david.a.cohen@linux.intel.com>
> + *
> + * 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.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/extcon.h>
> +#include <linux/gpio.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +
> +#define DRV_NAME "usb_otg_port"
This definition is not necessary. It is used only one time in this driver. Also, this name should reflect specific hardware.
> +#define USB_OTG_GPIO_USB_ID 0
> +#define USB_OTG_GPIO_VBUS_EN 1
> +#define USB_OTG_GPIO_USB_MUX 2
> +#define DEBOUNCE_TIME msecs_to_jiffies(50)
I recommend that you use the gpiod_set_debounce() to get the debounce time. If there is any property for debounce, you use the default debounce time of DEBOUNCE_TIME.
> +
> +struct usb_otg {
> + struct device *dev;
> + struct extcon_dev *edev;
> + struct delayed_work work;
> + struct gpio_desc *gpio_usb_id;
> + struct gpio_desc *gpio_vbus_en;
> + struct gpio_desc *gpio_usb_mux;
> + int usb_id_irq;
> +};
> +
> +static const unsigned int usb_otg_cable[] = {
> + EXTCON_USB_HOST,
> + EXTCON_NONE,
> +};
> +
> +/*
> + * If id == 1, USB port should be set to peripheral
> + * if id == 0, USB port should be set to host
> + *
> + * Peripheral: set USB mux to peripheral and disable VBUS
> + * Host: set USB mux to host and enable VBUS
> + */
> +static void usb_otg_set_port(struct usb_otg *otg, int id)
> +{
> + int mux_val = id;
> + int vbus_val = !id;
> +
> + if (!IS_ERR(otg->gpio_usb_mux))
> + gpiod_direction_output(otg->gpio_usb_mux, mux_val);
> +
> + if (!IS_ERR(otg->gpio_vbus_en))
> + gpiod_direction_output(otg->gpio_vbus_en, vbus_val);
> +}
> +
> +static void usb_otg_do_usb_id(struct work_struct *work)
> +{
> + struct usb_otg *otg =
> + container_of(work, struct usb_otg, work.work);
> + int id = gpiod_get_value_cansleep(otg->gpio_usb_id);
> +
> + dev_info(otg->dev, "USB PORT ID: %s\n", id ? "PERIPHERAL" : "HOST");
I don't prefer to use the dev_info() on the fly. And I recommend that you modify the debug message which include more correct information.
It is just example. Not forced.
dev_dbg(otg->dev, "Connected device is %s\n", id ? "PERIPHERAL" : "HOST");
> +
> + /*
> + * id == 1: PERIPHERAL
> + * id == 0: HOST
> + */
> + usb_otg_set_port(otg, id);
This function is used only one time in this driver and it is not complex. You don't need to make the separate function.
> +
> + /*
> + * id == 0: HOST connected
> + * id == 1: Host disconnected
> + */
> + extcon_set_state_sync(otg->edev, EXTCON_USB_HOST, !id);
> +}
> +
> +static irqreturn_t usb_otg_thread_isr(int irq, void *priv)
> +{
> + struct usb_otg *otg = priv;
> +
> + /* id changed, let the pin settle and then process it */
I think "id changed" comment is unneeded.
> + mod_delayed_work(system_wq, &otg->work, DEBOUNCE_TIME);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int usb_otg_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct usb_otg *otg;
> + int ret;
> +
> + otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
> + if (!otg)
> + return -ENOMEM;
> +
> + otg->dev = dev;
> + INIT_DELAYED_WORK(&otg->work, usb_otg_do_usb_id);
> +
> + otg->gpio_usb_id = devm_gpiod_get_index(dev, "id",
> + USB_OTG_GPIO_USB_ID,
> + GPIOD_IN);
> + if (IS_ERR(otg->gpio_usb_id)) {
> + dev_err(dev, "can't request USB ID GPIO: ret = %ld\n",
> + PTR_ERR(otg->gpio_usb_id));
> + return PTR_ERR(otg->gpio_usb_id);
I prefer to use the consistent error message. This patch uses two style sentence when error happen as following: I recommend that you use the one style.
- "can't ..."
- "failed to ..."
how about changing the print style of error message as following? Because other error message print just error value in this driver.
- ": ret = %ld" -> ": %d"
> + }
> +
> + otg->usb_id_irq = gpiod_to_irq(otg->gpio_usb_id);
> + if (otg->usb_id_irq <= 0) {
> + dev_err(dev, "invalid USB ID IRQ: %d\n", otg->usb_id_irq);
ditto.
> + return -EINVAL;
> + }
> +
> + otg->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
> + USB_OTG_GPIO_VBUS_EN,
> + GPIOD_ASIS);
> + if (IS_ERR(otg->gpio_vbus_en))
> + dev_info(dev, "can't request VBUS EN GPIO, skipping it.\n");
I think that "skipping it." is unneeded.
> +
> + otg->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
> + USB_OTG_GPIO_USB_MUX,
> + GPIOD_ASIS);
> + if (IS_ERR(otg->gpio_usb_mux))
> + dev_info(dev, "can't request USB MUX, skipping it.\n");
I think that "skipping it." is unneeded.
> +
> + /* register extcon device */
> + otg->edev = devm_extcon_dev_allocate(dev, usb_otg_cable);
> + if (IS_ERR(otg->edev)) {
> + dev_err(dev, "failed to allocate extcon device\n");
ditto.
> + return -ENOMEM;
> + }
> +
> + ret = devm_extcon_dev_register(dev, otg->edev);
> + if (ret < 0) {
> + dev_err(dev, "failed to register extcon device: %d\n",
> + ret);
ditto.
> + return ret;
> + }
> +
> + ret = devm_request_threaded_irq(dev, otg->usb_id_irq,
> + NULL, usb_otg_thread_isr,
> + IRQF_SHARED | IRQF_ONESHOT |
> + IRQF_TRIGGER_RISING |
> + IRQF_TRIGGER_FALLING,
> + dev_name(dev), otg);
> + if (ret < 0) {
> + dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
ditto.
> + return ret;
> + }
> +
> + /* queue initial processing of id-pin */
> + queue_delayed_work(system_wq, &otg->work, 0);
> +
> + platform_set_drvdata(pdev, otg);
> +
> + return 0;
> +}
> +
> +static int usb_otg_remove(struct platform_device *pdev)
> +{
> + struct usb_otg *otg = platform_get_drvdata(pdev);
> +
> + devm_free_irq(&pdev->dev, otg->usb_id_irq, otg);
As I knew, you don't need to free irq when using devm_request_threaded_irq() function.
> + cancel_delayed_work_sync(&otg->work);
> +
> + return 0;
> +}
> +
> +static struct acpi_device_id usb_otg_acpi_match[] = {
> + { "INT3496" },
What is meaning of "INT3496"?
> + { }
> +};
> +MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
> +
> +static struct platform_driver usb_otg_driver = {
> + .driver = {
> + .name = DRV_NAME,
ditto. You can set the driver name directly without separate definition.
> + .owner = THIS_MODULE,
> + .acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
> + },
> + .probe = usb_otg_probe,
> + .remove = usb_otg_remove,
> +};
> +
> +module_platform_driver(usb_otg_driver);
> +
> +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
> +MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
> +MODULE_LICENSE("GPL");
>
--
Regards,
Chanwoo Choi
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 8:00 ` Chanwoo Choi
@ 2016-12-19 8:57 ` Hans de Goede
2016-12-19 9:41 ` Chanwoo Choi
0 siblings, 1 reply; 8+ messages in thread
From: Hans de Goede @ 2016-12-19 8:57 UTC (permalink / raw)
To: Chanwoo Choi, MyungJoo Ham; +Cc: linux-kernel, David Cohen
Hi,
On 19-12-16 09:00, Chanwoo Choi wrote:
> Hi Hans,
>
> I'm glad to post new extcon driver. But, we need to discuss the device name of "3gpio".
>
> I think that "3 GPIO" is ambiguous. You need to find more proper name. For example, extcon-qcom-spmi-misc.c uses one interrupt line to detect "USB_HOST". This driver name means the "Qualcomm USB extcon support".
Ok, so this driver is for the INT3496 Intel ACPI device,
so I think we should put intel in the name, I see a 2 options:
1) extcon-intel-3gpio-otg.c
2) extcon-intel-INT3496.c
Which one do you like best ?
>
> Also, I recommend that you make the documentation for this driver.
>
> On 2016년 12월 19일 09:12, Hans de Goede wrote:
>> From: David Cohen <david.a.cohen@intel.com>
>>
>> Add an exntcon driver to for USB OTG ports controlled by 3 GPIOs used on
>> Intel Baytrail and Cherrytrail tablets.
>>
>> Signed-off-by: David Cohen <david.a.cohen@intel.com>
>> [hdgoede@redhat.com: Port to current kernel, submit upstream]
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>> drivers/extcon/Kconfig | 7 ++
>> drivers/extcon/Makefile | 1 +
>> drivers/extcon/extcon-3gpio_otg.c | 201 ++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 209 insertions(+)
>> create mode 100644 drivers/extcon/extcon-3gpio_otg.c
>>
>> diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
>> index 04788d9..1aaa64f 100644
>> --- a/drivers/extcon/Kconfig
>> +++ b/drivers/extcon/Kconfig
>> @@ -14,6 +14,13 @@ if EXTCON
>>
>> comment "Extcon Device Drivers"
>>
>> +config EXTCON_3GPIO_OTG
>> + tristate "3 GPIO USB OTG extcon driver"
>> + depends on GPIOLIB || COMPILE_TEST
>> + help
>> + Say Y here to enable extcon support for USB OTG ports controlled
>> + by 3 GPIOs used on Intel Baytrail and Cherrytrail tablets.
>> +
>> config EXTCON_ADC_JACK
>> tristate "ADC Jack extcon support"
>> depends on IIO
>> diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
>> index 31a0a99..aa646fd 100644
>> --- a/drivers/extcon/Makefile
>> +++ b/drivers/extcon/Makefile
>> @@ -4,6 +4,7 @@
>>
>> obj-$(CONFIG_EXTCON) += extcon-core.o
>> extcon-core-objs += extcon.o devres.o
>> +obj-$(CONFIG_EXTCON_3GPIO_OTG) += extcon-3gpio_otg.o
>> obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
>> obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
>> obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
>> diff --git a/drivers/extcon/extcon-3gpio_otg.c b/drivers/extcon/extcon-3gpio_otg.c
>> new file mode 100644
>> index 0000000..fc8b14d1
>> --- /dev/null
>> +++ b/drivers/extcon/extcon-3gpio_otg.c
>> @@ -0,0 +1,201 @@
>> +/*
>> + * 3 GPIO USB OTG extcon driver
>> + *
>> + * Copyright (c) 2016) Hans de Goede <hdegoede@redhat.com>
>
> s/2016) -> 2016
Ok.
>
>> + *
>> + * Based on android x86 kernel code which is:
>> + *
>> + * Copyright (c) 2014, Intel Corporation.
>> + * Author: David Cohen <david.a.cohen@linux.intel.com>
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/extcon.h>
>> +#include <linux/gpio.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define DRV_NAME "usb_otg_port"
>
> This definition is not necessary. It is used only one time in this driver. Also, this name should reflect specific hardware.
Ok.
>> +#define USB_OTG_GPIO_USB_ID 0
>> +#define USB_OTG_GPIO_VBUS_EN 1
>> +#define USB_OTG_GPIO_USB_MUX 2
>> +#define DEBOUNCE_TIME msecs_to_jiffies(50)
>
> I recommend that you use the gpiod_set_debounce() to get the debounce time. If there is any property for debounce, you use the default debounce time of DEBOUNCE_TIME.
This driver is for Intel SoCs only, and Intel SoC's gpios
do not support gpiod_set_debounce(), so calling it only
to find out it returns -ENOTSUPP and then still doing
debounce ourselves does not seem useful.
>> +
>> +struct usb_otg {
>> + struct device *dev;
>> + struct extcon_dev *edev;
>> + struct delayed_work work;
>> + struct gpio_desc *gpio_usb_id;
>> + struct gpio_desc *gpio_vbus_en;
>> + struct gpio_desc *gpio_usb_mux;
>> + int usb_id_irq;
>> +};
>> +
>> +static const unsigned int usb_otg_cable[] = {
>> + EXTCON_USB_HOST,
>> + EXTCON_NONE,
>> +};
>> +
>> +/*
>> + * If id == 1, USB port should be set to peripheral
>> + * if id == 0, USB port should be set to host
>> + *
>> + * Peripheral: set USB mux to peripheral and disable VBUS
>> + * Host: set USB mux to host and enable VBUS
>> + */
>> +static void usb_otg_set_port(struct usb_otg *otg, int id)
>> +{
>> + int mux_val = id;
>> + int vbus_val = !id;
>> +
>> + if (!IS_ERR(otg->gpio_usb_mux))
>> + gpiod_direction_output(otg->gpio_usb_mux, mux_val);
>> +
>> + if (!IS_ERR(otg->gpio_vbus_en))
>> + gpiod_direction_output(otg->gpio_vbus_en, vbus_val);
>> +}
>> +
>> +static void usb_otg_do_usb_id(struct work_struct *work)
>> +{
>> + struct usb_otg *otg =
>> + container_of(work, struct usb_otg, work.work);
>> + int id = gpiod_get_value_cansleep(otg->gpio_usb_id);
>> +
>> + dev_info(otg->dev, "USB PORT ID: %s\n", id ? "PERIPHERAL" : "HOST");
>
> I don't prefer to use the dev_info() on the fly. And I recommend that you modify the debug message which include more correct information.
>
> It is just example. Not forced.
> dev_dbg(otg->dev, "Connected device is %s\n", id ? "PERIPHERAL" : "HOST");
Ok.
>> +
>> + /*
>> + * id == 1: PERIPHERAL
>> + * id == 0: HOST
>> + */
>> + usb_otg_set_port(otg, id);
>
> This function is used only one time in this driver and it is not complex. You don't need to make the separate function.
Ok.
>> +
>> + /*
>> + * id == 0: HOST connected
>> + * id == 1: Host disconnected
>> + */
>> + extcon_set_state_sync(otg->edev, EXTCON_USB_HOST, !id);
>> +}
>> +
>> +static irqreturn_t usb_otg_thread_isr(int irq, void *priv)
>> +{
>> + struct usb_otg *otg = priv;
>> +
>> + /* id changed, let the pin settle and then process it */
>
> I think "id changed" comment is unneeded.
The comment is there because of the "let the pin settle" bit,
it explains why DEBOUNCE_TIME is used.
>> + mod_delayed_work(system_wq, &otg->work, DEBOUNCE_TIME);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int usb_otg_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct usb_otg *otg;
>> + int ret;
>> +
>> + otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
>> + if (!otg)
>> + return -ENOMEM;
>> +
>> + otg->dev = dev;
>> + INIT_DELAYED_WORK(&otg->work, usb_otg_do_usb_id);
>> +
>> + otg->gpio_usb_id = devm_gpiod_get_index(dev, "id",
>> + USB_OTG_GPIO_USB_ID,
>> + GPIOD_IN);
>> + if (IS_ERR(otg->gpio_usb_id)) {
>> + dev_err(dev, "can't request USB ID GPIO: ret = %ld\n",
>> + PTR_ERR(otg->gpio_usb_id));
>> + return PTR_ERR(otg->gpio_usb_id);
>
> I prefer to use the consistent error message. This patch uses two style sentence when error happen as following: I recommend that you use the one style.
> - "can't ..."
> - "failed to ..."
>
> how about changing the print style of error message as following? Because other error message print just error value in this driver.
> - ": ret = %ld" -> ": %d"
Ok, will fix.
>
>> + }
>> +
>> + otg->usb_id_irq = gpiod_to_irq(otg->gpio_usb_id);
>> + if (otg->usb_id_irq <= 0) {
>> + dev_err(dev, "invalid USB ID IRQ: %d\n", otg->usb_id_irq);
>
> ditto.
>
>> + return -EINVAL;
>> + }
>> +
>> + otg->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
>> + USB_OTG_GPIO_VBUS_EN,
>> + GPIOD_ASIS);
>> + if (IS_ERR(otg->gpio_vbus_en))
>> + dev_info(dev, "can't request VBUS EN GPIO, skipping it.\n");
>
> I think that "skipping it." is unneeded.
Ok.
>> +
>> + otg->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
>> + USB_OTG_GPIO_USB_MUX,
>> + GPIOD_ASIS);
>> + if (IS_ERR(otg->gpio_usb_mux))
>> + dev_info(dev, "can't request USB MUX, skipping it.\n");
>
> I think that "skipping it." is unneeded.
>
>> +
>> + /* register extcon device */
>> + otg->edev = devm_extcon_dev_allocate(dev, usb_otg_cable);
>> + if (IS_ERR(otg->edev)) {
>> + dev_err(dev, "failed to allocate extcon device\n");
>
> ditto.
>
>> + return -ENOMEM;
>> + }
>> +
>> + ret = devm_extcon_dev_register(dev, otg->edev);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to register extcon device: %d\n",
>> + ret);
>
> ditto.
>
>> + return ret;
>> + }
>> +
>> + ret = devm_request_threaded_irq(dev, otg->usb_id_irq,
>> + NULL, usb_otg_thread_isr,
>> + IRQF_SHARED | IRQF_ONESHOT |
>> + IRQF_TRIGGER_RISING |
>> + IRQF_TRIGGER_FALLING,
>> + dev_name(dev), otg);
>> + if (ret < 0) {
>> + dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
>
> ditto.
>
>> + return ret;
>> + }
>> +
>> + /* queue initial processing of id-pin */
>> + queue_delayed_work(system_wq, &otg->work, 0);
>> +
>> + platform_set_drvdata(pdev, otg);
>> +
>> + return 0;
>> +}
>> +
>> +static int usb_otg_remove(struct platform_device *pdev)
>> +{
>> + struct usb_otg *otg = platform_get_drvdata(pdev);
>> +
>> + devm_free_irq(&pdev->dev, otg->usb_id_irq, otg);
>
> As I knew, you don't need to free irq when using devm_request_threaded_irq() function.
Correct, but we need to free it before cancelling the work, otherwise
the irq may trigger between us cancelling the work and the devm code
disabling the irq, re-queueing the work while the struct work
now sits in free-ed memory and bad things happen.
>> + cancel_delayed_work_sync(&otg->work);
>> +
>> + return 0;
>> +}
>> +
>> +static struct acpi_device_id usb_otg_acpi_match[] = {
>> + { "INT3496" },
>
> What is meaning of "INT3496"?
It is the ACPI hardware-id for the ACPI device representing
the presence of an otg connector which should be handled by
this driver. The INT stands for Intel, the rest is just like
say a pci device-id, so a vendor defined number.
>
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
>> +
>> +static struct platform_driver usb_otg_driver = {
>> + .driver = {
>> + .name = DRV_NAME,
>
> ditto. You can set the driver name directly without separate definition.
Ok.
>> + .owner = THIS_MODULE,
>> + .acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
>> + },
>> + .probe = usb_otg_probe,
>> + .remove = usb_otg_remove,
>> +};
>> +
>> +module_platform_driver(usb_otg_driver);
>> +
>> +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
>> +MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
>> +MODULE_LICENSE("GPL");
>>
>
Thank you for the review, I will send a v2 when we've decided on a better
name for the driver.
Regards,
Hans
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs
2016-12-19 8:57 ` Hans de Goede
@ 2016-12-19 9:41 ` Chanwoo Choi
0 siblings, 0 replies; 8+ messages in thread
From: Chanwoo Choi @ 2016-12-19 9:41 UTC (permalink / raw)
To: Hans de Goede, MyungJoo Ham; +Cc: linux-kernel, David Cohen
Hi,
On 2016년 12월 19일 17:57, Hans de Goede wrote:
> Hi,
>
> On 19-12-16 09:00, Chanwoo Choi wrote:
>> Hi Hans,
>>
>> I'm glad to post new extcon driver. But, we need to discuss the device name of "3gpio".
>>
>> I think that "3 GPIO" is ambiguous. You need to find more proper name. For example, extcon-qcom-spmi-misc.c uses one interrupt line to detect "USB_HOST". This driver name means the "Qualcomm USB extcon support".
>
> Ok, so this driver is for the INT3496 Intel ACPI device,
> so I think we should put intel in the name, I see a 2 options:
>
> 1) extcon-intel-3gpio-otg.c
> 2) extcon-intel-INT3496.c
>
> Which one do you like best ?
I prefer "2) extcon-intel-INT3496.c".
But, should you use the captical letter for "INT..."?
Usually, the device name uses the small letter.
>
>
>>
>> Also, I recommend that you make the documentation for this driver.
>>
>> On 2016년 12월 19일 09:12, Hans de Goede wrote:
>>> From: David Cohen <david.a.cohen@intel.com>
>>>
>>> Add an exntcon driver to for USB OTG ports controlled by 3 GPIOs used on
>>> Intel Baytrail and Cherrytrail tablets.
>>>
>>> Signed-off-by: David Cohen <david.a.cohen@intel.com>
>>> [hdgoede@redhat.com: Port to current kernel, submit upstream]
>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>> ---
>>> drivers/extcon/Kconfig | 7 ++
>>> drivers/extcon/Makefile | 1 +
>>> drivers/extcon/extcon-3gpio_otg.c | 201 ++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 209 insertions(+)
>>> create mode 100644 drivers/extcon/extcon-3gpio_otg.c
>>>
>>> diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
>>> index 04788d9..1aaa64f 100644
>>> --- a/drivers/extcon/Kconfig
>>> +++ b/drivers/extcon/Kconfig
>>> @@ -14,6 +14,13 @@ if EXTCON
>>>
>>> comment "Extcon Device Drivers"
>>>
>>> +config EXTCON_3GPIO_OTG
>>> + tristate "3 GPIO USB OTG extcon driver"
>>> + depends on GPIOLIB || COMPILE_TEST
>>> + help
>>> + Say Y here to enable extcon support for USB OTG ports controlled
>>> + by 3 GPIOs used on Intel Baytrail and Cherrytrail tablets.
>>> +
>>> config EXTCON_ADC_JACK
>>> tristate "ADC Jack extcon support"
>>> depends on IIO
>>> diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
>>> index 31a0a99..aa646fd 100644
>>> --- a/drivers/extcon/Makefile
>>> +++ b/drivers/extcon/Makefile
>>> @@ -4,6 +4,7 @@
>>>
>>> obj-$(CONFIG_EXTCON) += extcon-core.o
>>> extcon-core-objs += extcon.o devres.o
>>> +obj-$(CONFIG_EXTCON_3GPIO_OTG) += extcon-3gpio_otg.o
>>> obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
>>> obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
>>> obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
>>> diff --git a/drivers/extcon/extcon-3gpio_otg.c b/drivers/extcon/extcon-3gpio_otg.c
>>> new file mode 100644
>>> index 0000000..fc8b14d1
>>> --- /dev/null
>>> +++ b/drivers/extcon/extcon-3gpio_otg.c
>>> @@ -0,0 +1,201 @@
>>> +/*
>>> + * 3 GPIO USB OTG extcon driver
>>> + *
>>> + * Copyright (c) 2016) Hans de Goede <hdegoede@redhat.com>
>>
>> s/2016) -> 2016
>
> Ok.
>
>>
>>> + *
>>> + * Based on android x86 kernel code which is:
>>> + *
>>> + * Copyright (c) 2014, Intel Corporation.
>>> + * Author: David Cohen <david.a.cohen@linux.intel.com>
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#include <linux/acpi.h>
>>> +#include <linux/extcon.h>
>>> +#include <linux/gpio.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/platform_device.h>
>>> +
>>> +#define DRV_NAME "usb_otg_port"
>>
>> This definition is not necessary. It is used only one time in this driver. Also, this name should reflect specific hardware.
>
> Ok.
>
>>> +#define USB_OTG_GPIO_USB_ID 0
>>> +#define USB_OTG_GPIO_VBUS_EN 1
>>> +#define USB_OTG_GPIO_USB_MUX 2
>>> +#define DEBOUNCE_TIME msecs_to_jiffies(50)
>>
>> I recommend that you use the gpiod_set_debounce() to get the debounce time. If there is any property for debounce, you use the default debounce time of DEBOUNCE_TIME.
>
> This driver is for Intel SoCs only, and Intel SoC's gpios
> do not support gpiod_set_debounce(), so calling it only
> to find out it returns -ENOTSUPP and then still doing
> debounce ourselves does not seem useful.
OK.
>
>>> +
>>> +struct usb_otg {
>>> + struct device *dev;
>>> + struct extcon_dev *edev;
>>> + struct delayed_work work;
>>> + struct gpio_desc *gpio_usb_id;
>>> + struct gpio_desc *gpio_vbus_en;
>>> + struct gpio_desc *gpio_usb_mux;
>>> + int usb_id_irq;
>>> +};
>>> +
>>> +static const unsigned int usb_otg_cable[] = {
>>> + EXTCON_USB_HOST,
>>> + EXTCON_NONE,
>>> +};
>>> +
>>> +/*
>>> + * If id == 1, USB port should be set to peripheral
>>> + * if id == 0, USB port should be set to host
>>> + *
>>> + * Peripheral: set USB mux to peripheral and disable VBUS
>>> + * Host: set USB mux to host and enable VBUS
>>> + */
>>> +static void usb_otg_set_port(struct usb_otg *otg, int id)
>>> +{
>>> + int mux_val = id;
>>> + int vbus_val = !id;
>>> +
>>> + if (!IS_ERR(otg->gpio_usb_mux))
>>> + gpiod_direction_output(otg->gpio_usb_mux, mux_val);
>>> +
>>> + if (!IS_ERR(otg->gpio_vbus_en))
>>> + gpiod_direction_output(otg->gpio_vbus_en, vbus_val);
>>> +}
>>> +
>>> +static void usb_otg_do_usb_id(struct work_struct *work)
>>> +{
>>> + struct usb_otg *otg =
>>> + container_of(work, struct usb_otg, work.work);
>>> + int id = gpiod_get_value_cansleep(otg->gpio_usb_id);
>>> +
>>> + dev_info(otg->dev, "USB PORT ID: %s\n", id ? "PERIPHERAL" : "HOST");
>>
>> I don't prefer to use the dev_info() on the fly. And I recommend that you modify the debug message which include more correct information.
>>
>> It is just example. Not forced.
>> dev_dbg(otg->dev, "Connected device is %s\n", id ? "PERIPHERAL" : "HOST");
>
> Ok.
>
>>> +
>>> + /*
>>> + * id == 1: PERIPHERAL
>>> + * id == 0: HOST
>>> + */
>>> + usb_otg_set_port(otg, id);
>>
>> This function is used only one time in this driver and it is not complex. You don't need to make the separate function.
>
> Ok.
>
>>> +
>>> + /*
>>> + * id == 0: HOST connected
>>> + * id == 1: Host disconnected
>>> + */
>>> + extcon_set_state_sync(otg->edev, EXTCON_USB_HOST, !id);
>>> +}
>>> +
>>> +static irqreturn_t usb_otg_thread_isr(int irq, void *priv)
>>> +{
>>> + struct usb_otg *otg = priv;
>>> +
>>> + /* id changed, let the pin settle and then process it */
>>
>> I think "id changed" comment is unneeded.
>
> The comment is there because of the "let the pin settle" bit,
> it explains why DEBOUNCE_TIME is used.
OK. If so, could you use the more formal sentence instead of "id changed"?
>
>>> + mod_delayed_work(system_wq, &otg->work, DEBOUNCE_TIME);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int usb_otg_probe(struct platform_device *pdev)
>>> +{
>>> + struct device *dev = &pdev->dev;
>>> + struct usb_otg *otg;
>>> + int ret;
>>> +
>>> + otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
>>> + if (!otg)
>>> + return -ENOMEM;
>>> +
>>> + otg->dev = dev;
>>> + INIT_DELAYED_WORK(&otg->work, usb_otg_do_usb_id);
>>> +
>>> + otg->gpio_usb_id = devm_gpiod_get_index(dev, "id",
>>> + USB_OTG_GPIO_USB_ID,
>>> + GPIOD_IN);
>>> + if (IS_ERR(otg->gpio_usb_id)) {
>>> + dev_err(dev, "can't request USB ID GPIO: ret = %ld\n",
>>> + PTR_ERR(otg->gpio_usb_id));
>>> + return PTR_ERR(otg->gpio_usb_id);
>>
>> I prefer to use the consistent error message. This patch uses two style sentence when error happen as following: I recommend that you use the one style.
>> - "can't ..."
>> - "failed to ..."
>>
>> how about changing the print style of error message as following? Because other error message print just error value in this driver.
>> - ": ret = %ld" -> ": %d"
>
> Ok, will fix.
>
>>
>>> + }
>>> +
>>> + otg->usb_id_irq = gpiod_to_irq(otg->gpio_usb_id);
>>> + if (otg->usb_id_irq <= 0) {
>>> + dev_err(dev, "invalid USB ID IRQ: %d\n", otg->usb_id_irq);
>>
>> ditto.
>>
>>> + return -EINVAL;
>>> + }
>>> +
>>> + otg->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
>>> + USB_OTG_GPIO_VBUS_EN,
>>> + GPIOD_ASIS);
>>> + if (IS_ERR(otg->gpio_vbus_en))
>>> + dev_info(dev, "can't request VBUS EN GPIO, skipping it.\n");
>>
>> I think that "skipping it." is unneeded.
>
> Ok.
>
>>> +
>>> + otg->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
>>> + USB_OTG_GPIO_USB_MUX,
>>> + GPIOD_ASIS);
>>> + if (IS_ERR(otg->gpio_usb_mux))
>>> + dev_info(dev, "can't request USB MUX, skipping it.\n");
>>
>> I think that "skipping it." is unneeded.
>>
>>> +
>>> + /* register extcon device */
>>> + otg->edev = devm_extcon_dev_allocate(dev, usb_otg_cable);
>>> + if (IS_ERR(otg->edev)) {
>>> + dev_err(dev, "failed to allocate extcon device\n");
>>
>> ditto.
>>
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + ret = devm_extcon_dev_register(dev, otg->edev);
>>> + if (ret < 0) {
>>> + dev_err(dev, "failed to register extcon device: %d\n",
>>> + ret);
>>
>> ditto.
>>
>>> + return ret;
>>> + }
>>> +
>>> + ret = devm_request_threaded_irq(dev, otg->usb_id_irq,
>>> + NULL, usb_otg_thread_isr,
>>> + IRQF_SHARED | IRQF_ONESHOT |
>>> + IRQF_TRIGGER_RISING |
>>> + IRQF_TRIGGER_FALLING,
>>> + dev_name(dev), otg);
>>> + if (ret < 0) {
>>> + dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
>>
>> ditto.
>>
>>> + return ret;
>>> + }
>>> +
>>> + /* queue initial processing of id-pin */
>>> + queue_delayed_work(system_wq, &otg->work, 0);
>>> +
>>> + platform_set_drvdata(pdev, otg);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int usb_otg_remove(struct platform_device *pdev)
>>> +{
>>> + struct usb_otg *otg = platform_get_drvdata(pdev);
>>> +
>>> + devm_free_irq(&pdev->dev, otg->usb_id_irq, otg);
>>
>> As I knew, you don't need to free irq when using devm_request_threaded_irq() function.
>
> Correct, but we need to free it before cancelling the work, otherwise
> the irq may trigger between us cancelling the work and the devm code
> disabling the irq, re-queueing the work while the struct work
> now sits in free-ed memory and bad things happen.
OK.
>
>>> + cancel_delayed_work_sync(&otg->work);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static struct acpi_device_id usb_otg_acpi_match[] = {
>>> + { "INT3496" },
>>
>> What is meaning of "INT3496"?
>
> It is the ACPI hardware-id for the ACPI device representing
> the presence of an otg connector which should be handled by
> this driver. The INT stands for Intel, the rest is just like
> say a pci device-id, so a vendor defined number.
Thanks for explanation.
>
>>
>>> + { }
>>> +};
>>> +MODULE_DEVICE_TABLE(acpi, usb_otg_acpi_match);
>>> +
>>> +static struct platform_driver usb_otg_driver = {
>>> + .driver = {
>>> + .name = DRV_NAME,
>>
>> ditto. You can set the driver name directly without separate definition.
>
> Ok.
>
>>> + .owner = THIS_MODULE,
>>> + .acpi_match_table = ACPI_PTR(usb_otg_acpi_match),
>>> + },
>>> + .probe = usb_otg_probe,
>>> + .remove = usb_otg_remove,
>>> +};
>>> +
>>> +module_platform_driver(usb_otg_driver);
>>> +
>>> +MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
>>> +MODULE_DESCRIPTION("3 GPIO USB OTG extcon driver");
>>> +MODULE_LICENSE("GPL");
>>>
>>
>
>
> Thank you for the review, I will send a v2 when we've decided on a better
> name for the driver.
>
> Regards,
>
> Hans
>
>
>
--
Regards,
Chanwoo Choi
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-12-19 9:41 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-19 2:01 [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs kbuild test robot
2016-12-19 0:12 ` Hans de Goede
2016-12-19 1:57 ` kbuild test robot
2016-12-19 2:01 ` [PATCH] extcon: 3gpio: fix platform_no_drv_owner.cocci warnings kbuild test robot
2016-12-19 2:34 ` [PATCH] extcon: 3gpio: add driver for USB OTG port controlled by 3 GPIOs kbuild test robot
2016-12-19 8:00 ` Chanwoo Choi
2016-12-19 8:57 ` Hans de Goede
2016-12-19 9:41 ` Chanwoo Choi
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