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Diffstat (limited to 'kernel/net/rfkill/rfkill-regulator.c')
-rw-r--r--kernel/net/rfkill/rfkill-regulator.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/kernel/net/rfkill/rfkill-regulator.c b/kernel/net/rfkill/rfkill-regulator.c
new file mode 100644
index 000000000..50cd26a48
--- /dev/null
+++ b/kernel/net/rfkill/rfkill-regulator.c
@@ -0,0 +1,154 @@
+/*
+ * rfkill-regulator.c - Regulator consumer driver for rfkill
+ *
+ * Copyright (C) 2009 Guiming Zhuo <gmzhuo@gmail.com>
+ * Copyright (C) 2011 Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * Implementation inspired by leds-regulator driver.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/rfkill.h>
+#include <linux/rfkill-regulator.h>
+
+struct rfkill_regulator_data {
+ struct rfkill *rf_kill;
+ bool reg_enabled;
+
+ struct regulator *vcc;
+};
+
+static int rfkill_regulator_set_block(void *data, bool blocked)
+{
+ struct rfkill_regulator_data *rfkill_data = data;
+ int ret = 0;
+
+ pr_debug("%s: blocked: %d\n", __func__, blocked);
+
+ if (blocked) {
+ if (rfkill_data->reg_enabled) {
+ regulator_disable(rfkill_data->vcc);
+ rfkill_data->reg_enabled = false;
+ }
+ } else {
+ if (!rfkill_data->reg_enabled) {
+ ret = regulator_enable(rfkill_data->vcc);
+ if (!ret)
+ rfkill_data->reg_enabled = true;
+ }
+ }
+
+ pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
+ regulator_is_enabled(rfkill_data->vcc));
+
+ return ret;
+}
+
+static struct rfkill_ops rfkill_regulator_ops = {
+ .set_block = rfkill_regulator_set_block,
+};
+
+static int rfkill_regulator_probe(struct platform_device *pdev)
+{
+ struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
+ struct rfkill_regulator_data *rfkill_data;
+ struct regulator *vcc;
+ struct rfkill *rf_kill;
+ int ret = 0;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "no platform data\n");
+ return -ENODEV;
+ }
+
+ if (pdata->name == NULL || pdata->type == 0) {
+ dev_err(&pdev->dev, "invalid name or type in platform data\n");
+ return -EINVAL;
+ }
+
+ vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
+ if (IS_ERR(vcc)) {
+ dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
+ ret = PTR_ERR(vcc);
+ goto out;
+ }
+
+ rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
+ if (rfkill_data == NULL) {
+ ret = -ENOMEM;
+ goto err_data_alloc;
+ }
+
+ rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
+ pdata->type,
+ &rfkill_regulator_ops, rfkill_data);
+ if (rf_kill == NULL) {
+ ret = -ENOMEM;
+ goto err_rfkill_alloc;
+ }
+
+ if (regulator_is_enabled(vcc)) {
+ dev_dbg(&pdev->dev, "Regulator already enabled\n");
+ rfkill_data->reg_enabled = true;
+ }
+ rfkill_data->vcc = vcc;
+ rfkill_data->rf_kill = rf_kill;
+
+ ret = rfkill_register(rf_kill);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot register rfkill device\n");
+ goto err_rfkill_register;
+ }
+
+ platform_set_drvdata(pdev, rfkill_data);
+ dev_info(&pdev->dev, "%s initialized\n", pdata->name);
+
+ return 0;
+
+err_rfkill_register:
+ rfkill_destroy(rf_kill);
+err_rfkill_alloc:
+ kfree(rfkill_data);
+err_data_alloc:
+ regulator_put(vcc);
+out:
+ return ret;
+}
+
+static int rfkill_regulator_remove(struct platform_device *pdev)
+{
+ struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
+ struct rfkill *rf_kill = rfkill_data->rf_kill;
+
+ rfkill_unregister(rf_kill);
+ rfkill_destroy(rf_kill);
+ regulator_put(rfkill_data->vcc);
+ kfree(rfkill_data);
+
+ return 0;
+}
+
+static struct platform_driver rfkill_regulator_driver = {
+ .probe = rfkill_regulator_probe,
+ .remove = rfkill_regulator_remove,
+ .driver = {
+ .name = "rfkill-regulator",
+ },
+};
+
+module_platform_driver(rfkill_regulator_driver);
+
+MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
+MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
+MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rfkill-regulator");