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authorJonas Aaberg <jonas.aberg@stericsson.com>2010-04-07 13:41:56 +0200
committerJohn Rigby <john.rigby@linaro.org>2010-09-02 22:45:01 -0600
commit16c38ee65b1ba497dc02055c9cdf80b24caeb117 (patch)
tree8de2d86afa7e6430d853e2fceec77d131a2442ac /arch/arm/mach-ux500/sensors1p.c
parent76b78592a87aa40573ae081028671e5089bf0166 (diff)
downloadlinux-2.6.34-ux500-16c38ee65b1ba497dc02055c9cdf80b24caeb117.tar.gz
One pin Sensor driver added. Support for proximity sensor (Osram SFH7741) and HAL switch (Samsung HED54XXU11).
Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Diffstat (limited to 'arch/arm/mach-ux500/sensors1p.c')
-rw-r--r--arch/arm/mach-ux500/sensors1p.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/sensors1p.c b/arch/arm/mach-ux500/sensors1p.c
new file mode 100644
index 00000000000..17cb0291e27
--- /dev/null
+++ b/arch/arm/mach-ux500/sensors1p.c
@@ -0,0 +1,316 @@
+
+/*
+ * Copyright (C) 2009-2010 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Simple userspace interface for
+ * Proximity Sensor Osram SFH 7741 and HAL switch Samsung HED54XXU11
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
+ *
+ * This driver is only there for making Android happy. It is not ment
+ * for mainline.
+ */
+
+
+#include <linux/platform_device.h>
+#include <linux/sysfs.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/regulator/consumer.h>
+
+#include <mach/sensors1p.h>
+#ifndef CONFIG_REGULATOR
+#include <mach/ab8500.h>
+#endif
+
+struct sensor {
+ struct regulator *regulator;
+ int pin;
+ int startup_time;
+ int active;
+ u64 when_enabled;
+};
+
+struct sensors1p {
+ struct sensor hal;
+ struct sensor proximity;
+};
+
+#ifndef CONFIG_REGULATOR
+static void force_power_on(void)
+{
+ /* Force VAUX1 to be active */
+ int val;
+ /* High power */
+ val = ab8500_read(AB8500_REGU_CTRL2,
+ AB8500_REGU_VAUX12_REGU_REG);
+ val |= 0x1;
+ ab8500_write(AB8500_REGU_CTRL2,
+ AB8500_REGU_VAUX12_REGU_REG, val);
+
+ /* 2.5V*/
+ val = ab8500_read(AB8500_REGU_CTRL2,
+ AB8500_REGU_VAUX1_SEL_REG);
+ val |= 0x8;
+ ab8500_write(AB8500_REGU_CTRL2,
+ AB8500_REGU_VAUX1_SEL_REG, val);
+}
+
+#endif
+
+
+static int sensors1p_power_write(struct device *dev,
+ struct sensor *s, const char *buf)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) != 1)
+ return -EINVAL;
+
+ if (val != 0 && val != 1)
+ return -EINVAL;
+
+ if (val != s->active) {
+ if (val) {
+ regulator_enable(s->regulator);
+ s->when_enabled = get_jiffies_64() +
+ msecs_to_jiffies(s->startup_time);
+#ifndef CONFIG_REGULATOR
+ force_power_on();
+#endif
+ } else
+ regulator_disable(s->regulator);
+ }
+ s->active = val;
+
+ return strnlen(buf, PAGE_SIZE);
+
+}
+
+static ssize_t sensors1p_sysfs_hal_active_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+
+
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sensors1p_power_write(dev, &s->hal, buf);
+
+}
+
+static ssize_t sensors1p_sysfs_proximity_active_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+
+
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sensors1p_power_write(dev, &s->proximity, buf);
+
+}
+
+
+static ssize_t sensors1p_sysfs_hal_active_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sprintf(buf, "%d", s->hal.active);
+}
+
+static ssize_t sensors1p_sysfs_proximity_active_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sprintf(buf, "%d", s->proximity.active);
+}
+
+
+
+static int sensors1p_read(struct device *dev, struct sensor *s, char *buf)
+{
+ int ret;
+
+ if (!s->active)
+ return -EINVAL;
+
+ /* Only wait if read() is called before the sensor is up and running
+ * Since jiffies wraps, always sleep maximum time.
+ */
+ if (time_before64(get_jiffies_64(), s->when_enabled))
+ mdelay(s->startup_time);
+
+ /* For some odd reason, setting direction in the probe function fails */
+ ret = gpio_direction_input(s->pin);
+
+ if (ret)
+ dev_err(dev, "Failed to set GPIO pin %d to input.\n", s->pin);
+ else
+ ret = gpio_get_value(s->pin);
+
+ return sprintf(buf, "%d", ret);
+}
+
+static ssize_t sensors1p_sysfs_hal_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sensors1p_read(dev, &s->hal, buf);
+}
+
+static ssize_t sensors1p_sysfs_proximity_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensors1p *s = platform_get_drvdata(container_of(dev,
+ struct platform_device,
+ dev));
+ return sensors1p_read(dev, &s->proximity, buf);
+}
+
+
+static DEVICE_ATTR(proximity_activate, 0666,
+ sensors1p_sysfs_proximity_active_get,
+ sensors1p_sysfs_proximity_active_set);
+static DEVICE_ATTR(hal_activate, 0666,
+ sensors1p_sysfs_hal_active_get,
+ sensors1p_sysfs_hal_active_set);
+static DEVICE_ATTR(proximity, 0444, sensors1p_sysfs_proximity_show, NULL);
+static DEVICE_ATTR(hal, 0444, sensors1p_sysfs_hal_show, NULL);
+
+static struct attribute *sensors1p_attrs[] = {
+ &dev_attr_proximity_activate.attr,
+ &dev_attr_hal_activate.attr,
+ &dev_attr_proximity.attr,
+ &dev_attr_hal.attr,
+ NULL,
+};
+
+static struct attribute_group sensors1p_attr_group = {
+ .name = NULL,
+ .attrs = sensors1p_attrs,
+};
+
+static int __init sensors1p_probe(struct platform_device *pdev)
+{
+ int err = -EINVAL;
+ struct sensors1p_config *c;
+ struct sensors1p *s = NULL;
+
+ if (!pdev)
+ goto out;
+
+ c = pdev->dev.platform_data;
+
+ if (c == NULL) {
+ dev_err(&pdev->dev, "Error: Missconfigured.\n");
+ goto out;
+ }
+
+ s = kzalloc(sizeof(struct sensors1p), GFP_KERNEL);
+
+ if (s == NULL) {
+ dev_err(&pdev->dev,
+ "Could not allocate struct memory!\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ s->hal.pin = c->hal.pin;
+ s->proximity.pin = c->proximity.pin;
+
+ s->hal.startup_time = s->hal.startup_time;
+ s->proximity.startup_time = s->proximity.startup_time;
+
+
+ s->hal.regulator = regulator_get(&pdev->dev, c->hal.regulator);
+
+ if (s->hal.regulator == NULL) {
+ dev_err(&pdev->dev, "regulator_get(\"%s\") failed.\n",
+ c->hal.regulator);
+ goto out;
+ }
+ s->proximity.regulator = regulator_get(&pdev->dev,
+ c->proximity.regulator);
+
+ if (s->proximity.regulator == NULL) {
+ dev_err(&pdev->dev, "regulator_get(\"%s\") failed.\n",
+ c->proximity.regulator);
+ goto out;
+ }
+
+#ifndef CONFIG_REGULATOR
+ force_power_on();
+#endif
+
+ err = sysfs_create_group(&pdev->dev.kobj, &sensors1p_attr_group);
+
+ if (err) {
+ dev_err(&pdev->dev, "Failed to create sysfs entries.\n");
+ goto out;
+ }
+
+ platform_set_drvdata(pdev, s);
+
+ return 0;
+out:
+ if (s) {
+ if (s->proximity.regulator)
+ regulator_put(s->proximity.regulator);
+
+ if (s->hal.regulator)
+ regulator_put(s->hal.regulator);
+ }
+ kfree(s);
+ return err;
+}
+
+static int __exit sensors1p_remove(struct platform_device *pdev)
+{
+ struct sensors1p *s = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&pdev->dev.kobj, &sensors1p_attr_group);
+ regulator_put(s->hal.regulator);
+ regulator_put(s->proximity.regulator);
+ kfree(s);
+ return 0;
+}
+
+static struct platform_driver sensors1p_driver = {
+ .probe = sensors1p_probe,
+ .remove = __exit_p(sensors1p_remove),
+ .driver = {
+ .name = "sensors1p",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init sensors1p_init(void)
+{
+ return platform_driver_register(&sensors1p_driver);
+}
+
+static void __exit sensors1p_exit(void)
+{
+ platform_driver_unregister(&sensors1p_driver);
+}
+
+late_initcall(sensors1p_init);
+module_exit(sensors1p_exit);
+
+MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
+MODULE_DESCRIPTION("One pin gpio sensors driver (Proximity+HAL)");
+MODULE_LICENSE("GPLv2");