misc: earjack_debugger: Add earjack debugger
Analog switch for Headset and UART has crosstalk issue. It makes a noise
when using headset due to messages via uart. So only enable the uart console
to avoid crosstalk issue when using earjack debugger
This driver controls the uart console enable/disable.
Change-Id: Ib90d463d5c9512f91d20c08448a58443596ad757
Signed-off-by: Devin Kim <dojip.kim@lge.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 29d5a8e..1b3b009 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -682,6 +682,16 @@
To compile this driver as a module, choose M here: the
module will be called ti_drv2667.
+config EARJACK_DEBUGGER
+ bool "Earjack UART debugger support"
+ depends on SERIAL_MSM_HSL
+ help
+ Enables support for Earjack Debugger trigger. It controls
+ uart console. uart console will be disabled if detected earjack
+ debugger. Otherwise, uart console will be enabled.
+
+ Say 'y' here to include support for earjack debugger trigger
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 3ad199c..b856e0d 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -72,3 +72,4 @@
obj-$(CONFIG_QFP_FUSE) += qfp_fuse.o
obj-$(CONFIG_TI_DRV2667) += ti_drv2667.o
obj-$(CONFIG_QPNP_MISC) += qpnp-misc.o
+obj-$(CONFIG_EARJACK_DEBUGGER) += earjack_debugger.o
diff --git a/drivers/misc/earjack_debugger.c b/drivers/misc/earjack_debugger.c
new file mode 100644
index 0000000..30b43e0
--- /dev/null
+++ b/drivers/misc/earjack_debugger.c
@@ -0,0 +1,199 @@
+/*
+ * earjack debugger trigger
+ *
+ * Copyright (C) 2012, 2013 LGE, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/of_gpio.h>
+
+#include <mach/msm_serial_hs_lite.h>
+
+struct earjack_debugger_device {
+ int gpio;
+ int irq;
+ int saved_detect;
+ void (*set_uart_console)(bool enable);
+};
+
+struct earjack_debugger_platform_data {
+ int gpio_trigger;
+};
+
+static int earjack_debugger_detected(void *dev)
+{
+ struct earjack_debugger_device *adev = dev;
+
+ return !!gpio_get_value(adev->gpio);
+}
+
+static irqreturn_t earjack_debugger_irq_handler(int irq, void *_dev)
+{
+ struct earjack_debugger_device *adev = _dev;
+ int detect;
+
+ /*
+ * add debounce time to avoid earjack popup noise
+ */
+ msleep(400);
+
+ detect = earjack_debugger_detected(adev);
+
+ if (detect) {
+ pr_debug("%s: in\n", __func__);
+ adev->set_uart_console(true);
+ } else {
+ pr_debug("%s: out\n", __func__);
+ adev->set_uart_console(false);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void earjack_debugger_parse_dt(struct device *dev,
+ struct earjack_debugger_platform_data *pdata)
+{
+ struct device_node *np = dev->of_node;
+ pdata->gpio_trigger = of_get_named_gpio_flags(np,
+ "serial,irq-gpio", 0, NULL);
+}
+
+static int earjack_debugger_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct earjack_debugger_device *adev;
+ struct earjack_debugger_platform_data *pdata;
+
+ if (pdev->dev.of_node) {
+ pdata = devm_kzalloc(&pdev->dev,
+ sizeof(struct earjack_debugger_platform_data),
+ GFP_KERNEL);
+ if (pdata == NULL) {
+ pr_err("%s: no pdata\n", __func__);
+ return -ENOMEM;
+ }
+ pdev->dev.platform_data = pdata;
+ earjack_debugger_parse_dt(&pdev->dev, pdata);
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
+ if (!pdata) {
+ pr_err("%s: no pdata\n", __func__);
+ return -ENODEV;
+ }
+
+ adev = kzalloc(sizeof(struct earjack_debugger_device), GFP_KERNEL);
+ if (!adev) {
+ pr_err("%s: no memory\n", __func__);
+ return -ENOMEM;
+ }
+
+ adev->gpio = pdata->gpio_trigger;
+ adev->irq = gpio_to_irq(pdata->gpio_trigger);
+ adev->set_uart_console = msm_console_set_enable;
+
+ platform_set_drvdata(pdev, adev);
+
+ ret = gpio_request_one(adev->gpio, GPIOF_IN, "gpio_earjack_debugger");
+ if (ret < 0) {
+ pr_err("%s: failed to request gpio %d\n", __func__,
+ adev->gpio);
+ goto err_gpio_request;
+ }
+
+ ret = request_threaded_irq(adev->irq, NULL,
+ earjack_debugger_irq_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "earjack_debugger_trigger", adev);
+ if (ret < 0) {
+ pr_err("%s: failed to request irq\n", __func__);
+ goto err_request_irq;
+ }
+
+ enable_irq_wake(adev->irq);
+
+ if (earjack_debugger_detected(adev))
+ adev->set_uart_console(true);
+
+ pr_info("%s: earjack debugger probed\n", __func__);
+
+ return ret;
+
+err_request_irq:
+ gpio_free(adev->gpio);
+err_gpio_request:
+ kfree(adev);
+
+ return ret;
+}
+
+static int earjack_debugger_remove(struct platform_device *pdev)
+{
+ struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
+
+ free_irq(adev->irq, adev);
+ gpio_free(adev->gpio);
+ kfree(adev);
+
+ return 0;
+}
+
+static void earjack_debugger_shutdown(struct platform_device *pdev)
+{
+ struct earjack_debugger_device *adev = platform_get_drvdata(pdev);
+
+ disable_irq(adev->irq);
+}
+
+static struct of_device_id earjack_debugger_match_table[] = {
+ { .compatible = "serial,earjack-debugger", },
+ { },
+};
+
+static struct platform_driver earjack_debugger_driver = {
+ .probe = earjack_debugger_probe,
+ .remove = __devexit_p(earjack_debugger_remove),
+ .shutdown = earjack_debugger_shutdown,
+ .driver = {
+ .name = "earjack-debugger",
+ .of_match_table = earjack_debugger_match_table,
+ },
+};
+
+static int __init earjack_debugger_init(void)
+{
+ return platform_driver_register(&earjack_debugger_driver);
+}
+
+static void __exit earjack_debugger_exit(void)
+{
+ platform_driver_unregister(&earjack_debugger_driver);
+}
+
+module_init(earjack_debugger_init);
+module_exit(earjack_debugger_exit);
