[PATCH 7/7] input/nomadik-ske: add sysfs file to enable/disble SKE keypad
From: Linus Walleij <hidden>
Date: 2012-05-13 12:44:31
From: Naveen Kumar Gaddipati <redacted> This sysfs file can force the SKE keypad into GPIO mode (low power) from userspace if the device knows that it is going to go into a mode where the keyboard is not going to be interactive. Signed-off-by: Naveen Kumar Gaddipati <redacted> Signed-off-by: Linus Walleij <redacted> --- drivers/input/keyboard/nomadik-ske-keypad.c | 62 +++++++++++++++++++++++++++ 1 file changed, 62 insertions(+)
diff --git a/drivers/input/keyboard/nomadik-ske-keypad.c b/drivers/input/keyboard/nomadik-ske-keypad.c
index d2cb4df..74ee59d 100644
--- a/drivers/input/keyboard/nomadik-ske-keypad.c
+++ b/drivers/input/keyboard/nomadik-ske-keypad.c@@ -193,6 +193,58 @@ static void ske_mode_enable(struct ske_keypad *keypad, bool enable) } } +static void ske_enable(struct ske_keypad *keypad, bool enable) +{ + keypad->enable = enable; + if (keypad->enable) { + enable_irq(keypad->irq); + ske_mode_enable(keypad, true); + } else { + ske_mode_enable(keypad, false); + disable_irq(keypad->irq); + } +} + +static ssize_t ske_show_attr_enable(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct ske_keypad *keypad = platform_get_drvdata(pdev); + return sprintf(buf, "%d\n", keypad->enable); +} + +static ssize_t ske_store_attr_enable(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + struct ske_keypad *keypad = platform_get_drvdata(pdev); + unsigned long val; + + if (strict_strtoul(buf, 0, &val)) + return -EINVAL; + + if ((val != 0) && (val != 1)) + return -EINVAL; + + if (keypad->enable != val) { + keypad->enable = val ? true : false; + ske_enable(keypad, keypad->enable); + } + return count; +} + +static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, + ske_show_attr_enable, ske_store_attr_enable); + +static struct attribute *ske_keypad_attrs[] = { + &dev_attr_enable.attr, + NULL, +}; + +static struct attribute_group ske_attr_group = { + .attrs = ske_keypad_attrs, +}; + static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col) { int row = 0, code, pos;
@@ -634,10 +686,19 @@ no_wakeup: goto out_unregisterinput; } + /* sysfs implementation for dynamic enable/disable the input event */ + ret = sysfs_create_group(&pdev->dev.kobj, &ske_attr_group); + if (ret) { + dev_err(&pdev->dev, "failed to create sysfs entries\n"); + goto out_free_irq; + } + platform_set_drvdata(pdev, keypad); return 0; +out_free_irq: + free_irq(keypad->irq, keypad); out_unregisterinput: input_unregister_device(input); input = NULL;
@@ -666,6 +727,7 @@ static int __devexit ske_keypad_remove(struct platform_device *pdev) cancel_delayed_work_sync(&keypad->scan_work); input_unregister_device(keypad->input); + sysfs_remove_group(&pdev->dev.kobj, &ske_attr_group); if (keypad->enable) clk_disable(keypad->clk); clk_put(keypad->clk);
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1.7.9.2