/
0007-pwm-pwm_test-Driver-support-for-PWM-module-testing.patch
373 lines (369 loc) · 10 KB
/
0007-pwm-pwm_test-Driver-support-for-PWM-module-testing.patch
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From 2d0c5055417289888f124a774577aff864c046ce Mon Sep 17 00:00:00 2001
From: "Philip, Avinash" <avinashphilip@ti.com>
Date: Tue, 17 Jul 2012 21:35:11 +0530
Subject: [PATCH 07/10] pwm: pwm_test: Driver support for PWM module testing
Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
---
drivers/pwm/Kconfig | 11 ++
drivers/pwm/Makefile | 1 +
drivers/pwm/pwm_test.c | 322 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 334 insertions(+), 0 deletions(-)
create mode 100644 drivers/pwm/pwm_test.c
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index ed81720..f1a0721 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -160,4 +160,15 @@ config PWM_VT8500
To compile this driver as a module, choose M here: the module
will be called pwm-vt8500.
+config EHRPWM_TEST
+ tristate "EHRPWM TEST support"
+ depends on PWM_TIEHRPWM
+
+ help
+ Test driver support for the EHRPWM PWM driver found on AM33XX
+ TI SOC
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm_ehrpwm.
+
endif
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index acfe482..e2c6277 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o
obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o
obj-$(CONFIG_PWM_TWL6030) += pwm-twl6030.o
obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o
+obj-$(CONFIG_EHRPWM_TEST) += pwm_test.o
diff --git a/drivers/pwm/pwm_test.c b/drivers/pwm/pwm_test.c
new file mode 100644
index 0000000..d9948db
--- /dev/null
+++ b/drivers/pwm/pwm_test.c
@@ -0,0 +1,322 @@
+/*
+ * PWM Test driver
+ *
+ * Copyright (C) 2012 Texas Instruments.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+
+struct pwm_test {
+ struct pwm_device *pwm;
+ int ret;
+ struct class *pwm_test_class;
+ unsigned long period, duty, run, polarity, config, requested;
+ unsigned long period_s, duty_s, run_s, polarity_s, config_s, requested_s;
+ struct device *dev;
+};
+
+static ssize_t pwm_test_show_duty(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ return sprintf(buf, "%lu\n", pwm_test->duty);
+}
+
+static ssize_t pwm_test_store_duty(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ rc = kstrtoul(buf, 0, &pwm_test->duty_s);
+ if (rc)
+ return rc;
+ return count;
+}
+
+static ssize_t pwm_test_show_period(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%lu\n", pwm_test->period);
+}
+
+static ssize_t pwm_test_store_period(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ rc = kstrtoul(buf, 0, &pwm_test->period_s);
+ if (rc)
+ return rc;
+
+ return count;
+}
+
+static ssize_t pwm_test_show_config(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ if (pwm_test->config)
+ return sprintf(buf, "config Done\n");
+ else
+ return sprintf(buf, "config Failed\n");
+}
+static ssize_t pwm_test_store_config(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ int ret;
+
+ if (pwm_test->duty_s == 0) {
+ ret = pwm_config(pwm_test->pwm, 0, pwm_test->period_s);
+ if (ret) {
+ pwm_test->config = 0;
+ pr_err("operation failed %d\n", ret);
+ pwm_test->duty_s = pwm_test->duty;
+ pwm_test->period_s = pwm_test->period;
+ return ret;
+ }
+ pwm_test->duty = pwm_test->duty_s;
+ pwm_test->period = pwm_test->period_s;
+ pwm_test->config = 1;
+ } else {
+ ret = pwm_config(pwm_test->pwm, pwm_test->duty_s,
+ pwm_test->period_s);
+ if (ret) {
+ pwm_test->config = 0;
+ pr_err("operation failed %d\n", ret);
+ pwm_test->duty_s = pwm_test->duty;
+ pwm_test->period_s = pwm_test->period;
+ return ret;
+ }
+ pwm_test->duty = pwm_test->duty_s;
+ pwm_test->period = pwm_test->period_s;
+ pwm_test->config = 1;
+ }
+ return count;
+}
+
+static ssize_t pwm_test_show_run(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n", pwm_test->run ? "Enabled" : "Disabled");
+}
+
+static ssize_t pwm_test_store_run(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ rc = kstrtoul(buf, 0, &pwm_test->run_s);
+ if (rc)
+ return rc;
+
+ if (pwm_test->run_s)
+ rc = pwm_enable(pwm_test->pwm);
+ else
+ pwm_disable(pwm_test->pwm);
+
+ if (rc) {
+ pr_err("operation failed %d\n", rc);
+ pwm_test->run_s = pwm_test->run;
+ return rc;
+ }
+
+ pwm_test->run = pwm_test->run_s;
+ return count;
+}
+
+static ssize_t pwm_test_show_polarity(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n",
+ pwm_test->polarity ? "Polarity Inversed" :
+ "Polarity Normal");
+}
+
+static ssize_t pwm_test_store_polarity(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ rc = kstrtoul(buf, 0, &pwm_test->polarity_s);
+ if (rc)
+ return rc;
+
+ rc = pwm_set_polarity(pwm_test->pwm, pwm_test->polarity_s);
+ if (rc) {
+ pr_err("operation failed %d\n", rc);
+ return rc;
+ }
+
+ pwm_test->polarity = pwm_test->polarity_s;
+ return count;
+}
+
+static ssize_t pwm_test_show_request(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n", pwm_test->requested ? "Requested" : "Freed");
+}
+
+static ssize_t pwm_test_store_request(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int rc;
+ struct pwm_test *pwm_test = dev_get_drvdata(dev);
+
+ rc = kstrtoul(buf, 0, &pwm_test->requested_s);
+ if (rc)
+ return rc;
+
+ if (pwm_test->requested_s) {
+ pwm_test->pwm = pwm_get(dev, NULL);
+
+ if (IS_ERR(pwm_test->pwm)) {
+ dev_err(dev, "%s() %d %ld\n", __func__, __LINE__,
+ PTR_ERR(pwm_test->pwm));
+ rc = -EINVAL;
+ }
+ } else {
+ pwm_free(pwm_test->pwm);
+ pwm_test->polarity = 0;
+ pwm_test->run = 0;
+ pwm_test->duty = 0;
+ pwm_test->period = 0;
+ pwm_test->config = 0;
+ pwm_test->polarity_s = 0;
+ pwm_test->run_s = 0;
+ pwm_test->duty_s = 0;
+ pwm_test->period_s = 0;
+ pwm_test->config_s = 0;
+ rc = 0;
+ }
+
+ if (rc) {
+ pr_err("operation failed %d\n", rc);
+ pwm_test->requested_s = pwm_test->requested;
+ return rc;
+ }
+
+ pwm_test->requested = pwm_test->requested_s;
+ return count;
+}
+
+static DEVICE_ATTR(duty, 0644, pwm_test_show_duty, pwm_test_store_duty);
+static DEVICE_ATTR(period, 0644, pwm_test_show_period, pwm_test_store_period);
+static DEVICE_ATTR(polarity, 0644, pwm_test_show_polarity,
+ pwm_test_store_polarity);
+static DEVICE_ATTR(config, 0644 , pwm_test_show_config, pwm_test_store_config);
+static DEVICE_ATTR(run, 0644 , pwm_test_show_run, pwm_test_store_run);
+static DEVICE_ATTR(request, 0644 , pwm_test_show_request, pwm_test_store_request);
+
+static const struct attribute *pwm_attrs[] = {
+ &dev_attr_duty.attr,
+ &dev_attr_period.attr,
+ &dev_attr_config.attr,
+ &dev_attr_run.attr,
+ &dev_attr_request.attr,
+ &dev_attr_polarity.attr,
+ NULL,
+};
+
+static const struct attribute_group pwm_device_attr_group = {
+ .attrs = (struct attribute **) pwm_attrs,
+};
+
+static int __init pwm_test_class_init(struct device *dev)
+{
+ if (sysfs_create_group(&dev->kobj, &pwm_device_attr_group))
+ return 1;
+ return 0;
+}
+
+static int pwm_test_probe(struct platform_device *pdev)
+{
+ struct pwm_test *pwm_test;
+
+ pwm_test = devm_kzalloc(&pdev->dev, sizeof(*pwm_test), GFP_KERNEL);
+
+ if (!pwm_test) {
+ dev_err(&pdev->dev, "memory error\n");
+ return -ENOMEM;
+ }
+
+ if (pwm_test_class_init(&pdev->dev)) {
+ dev_err(&pdev->dev, "sysfs creation failed\n");
+ return -EINVAL;
+ }
+ dev_set_drvdata(&pdev->dev, pwm_test);
+ platform_set_drvdata(pdev, pwm_test);
+ return 0;
+}
+
+static int pwm_test_remove(struct platform_device *pdev)
+{
+ struct pwm_test *pwm_test = platform_get_drvdata(pdev);
+
+ if (!pwm_test->ret) {
+ pwm_config(pwm_test->pwm, 0, 0x1000);
+ pwm_disable(pwm_test->pwm);
+ pr_emerg("PWM Device Disabled %s\n", dev_name(&pdev->dev));
+ }
+ if (pwm_test->requested)
+ pwm_free(pwm_test->pwm);
+
+ pr_emerg("PWM Device Freed %s\n", dev_name(&pdev->dev));
+ pwm_test->run = 0;
+ sysfs_remove_group(&pdev->dev.kobj, &pwm_device_attr_group);
+ return 0;
+}
+
+static struct of_device_id pwm_test_of_match[] = {
+ { .compatible = "pwm_test" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, pwm_test_of_match);
+
+static struct platform_driver pwm_test_driver = {
+ .driver = {
+ .name = "pwm_test",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pwm_test_of_match),
+ },
+ .probe = pwm_test_probe,
+ .remove = pwm_test_remove,
+};
+
+module_platform_driver(pwm_test_driver);
+
+MODULE_DESCRIPTION("pwm_test Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pwm_test");
--
1.7.7.6