Add a regulator consumer driver for rfkill to enable controlling radio
transmitters connected to voltage regulators using the regulator
framework.
A new "vrfkill" virtual supply is provided to use in platform code.
Signed-off-by: Guiming Zhuo <gmzhuo@xxxxxxxxx>
Signed-off-by: Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>
---
Changes since v2:
- Fix struct field initializer syntax in example code from
include/linux/rfkill-regulator.h
This will make copying and pasting the code more straightforward.
- print the rfkill switch name in the info message when driver is
loaded successfully
Changes since v1:
- changed "voltage regulator" to "voltage regulators" in the commit
message
- drop rfkill_init_sw_state() as requested by Johannes Berg
- moved assignment fields of rfkill_data _before_ rfkill_register(),
as the latter will call .set_block (via schedule_work()) which would
find NULL pointers for the .vcc and .rf_kill fields otherwise.
This issue was masked when I was using rfkill_init_sw_state() which
was setting the persistent flag: rfkill_register() does not call
schedule_work() immediately when the persistent flag is set.
So please take another look at this part of rfkill_regulator_probe().
include/linux/rfkill-regulator.h | 48 +++++++++++
net/rfkill/Kconfig | 11 +++
net/rfkill/Makefile | 1 +
net/rfkill/rfkill-regulator.c | 164 ++++++++++++++++++++++++++++++++++++++
4 files changed, 224 insertions(+), 0 deletions(-)
create mode 100644 include/linux/rfkill-regulator.h
create mode 100644 net/rfkill/rfkill-regulator.c
diff --git a/include/linux/rfkill-regulator.h b/include/linux/rfkill-regulator.h
new file mode 100644
index 0000000..aca36bc
--- /dev/null
+++ b/include/linux/rfkill-regulator.h
@@ -0,0 +1,48 @@
+/*
+ * rfkill-regulator.c - Regulator consumer driver for rfkill
+ *
+ * Copyright (C) 2009 Guiming Zhuo <gmzhuo@xxxxxxxxx>
+ * Copyright (C) 2011 Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ */
+
+#ifndef __LINUX_RFKILL_REGULATOR_H
+#define __LINUX_RFKILL_REGULATOR_H
+
+/*
+ * Use "vrfkill" as supply id when declaring the regulator consumer:
+ *
+ * static struct regulator_consumer_supply pcap_regulator_V6_consumers [] = {
+ * { .dev_name = "rfkill-regulator.0", .supply = "vrfkill" },
+ * };
+ *
+ * If you have several regulator driven rfkill, you can append a numerical id to
+ * .dev_name as done above, and use the same id when declaring the platform
+ * device:
+ *
+ * static struct rfkill_regulator_platform_data ezx_rfkill_bt_data = {
+ * .name = "ezx-bluetooth",
+ * .type = RFKILL_TYPE_BLUETOOTH,
+ * };
+ *
+ * static struct platform_device a910_rfkill = {
+ * .name = "rfkill-regulator",
+ * .id = 0,
+ * .dev = {
+ * .platform_data = &ezx_rfkill_bt_data,
+ * },
+ * };
+ */
+
+#include <linux/rfkill.h>
+
+struct rfkill_regulator_platform_data {
+ char *name; /* the name for the rfkill switch */
+ enum rfkill_type type; /* the type as specified in rfkill.h */
+};
+
+#endif /* __LINUX_RFKILL_REGULATOR_H */
diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
index 7fce6df..48464ca 100644
--- a/net/rfkill/Kconfig
+++ b/net/rfkill/Kconfig
@@ -22,3 +22,14 @@ config RFKILL_INPUT
depends on RFKILL
depends on INPUT = y || RFKILL = INPUT
default y if !EXPERT
+
+config RFKILL_REGULATOR
+ tristate "Generic rfkill regulator driver"
+ depends on RFKILL || !RFKILL
+ depends on REGULATOR
+ help
+ This options enable controlling radio transmitters connected to
+ voltage regulator using the regulator framework.
+
+ To compile this driver as a module, choose M here: the module will
+ be called rfkill-regulator.
diff --git a/net/rfkill/Makefile b/net/rfkill/Makefile
index 6621053..d9a5a58 100644
--- a/net/rfkill/Makefile
+++ b/net/rfkill/Makefile
@@ -5,3 +5,4 @@
rfkill-y += core.o
rfkill-$(CONFIG_RFKILL_INPUT) += input.o
obj-$(CONFIG_RFKILL) += rfkill.o
+obj-$(CONFIG_RFKILL_REGULATOR) += rfkill-regulator.o
diff --git a/net/rfkill/rfkill-regulator.c b/net/rfkill/rfkill-regulator.c
new file mode 100644
index 0000000..18dc512
--- /dev/null
+++ b/net/rfkill/rfkill-regulator.c
@@ -0,0 +1,164 @@
+/*
+ * rfkill-regulator.c - Regulator consumer driver for rfkill
+ *
+ * Copyright (C) 2009 Guiming Zhuo <gmzhuo@xxxxxxxxx>
+ * Copyright (C) 2011 Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>
+ *
+ * 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;
+
+ pr_debug("%s: blocked: %d\n", __func__, blocked);
+
+ if (blocked) {
+ if (rfkill_data->reg_enabled) {
+ regulator_disable(rfkill_data->vcc);
+ rfkill_data->reg_enabled = 0;
+ }
+ } else {
+ if (!rfkill_data->reg_enabled) {
+ regulator_enable(rfkill_data->vcc);
+ rfkill_data->reg_enabled = 1;
+ }
+ }
+
+ pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
+ regulator_is_enabled(rfkill_data->vcc));
+
+ return 0;
+}
+
+struct rfkill_ops rfkill_regulator_ops = {
+ .set_block = rfkill_regulator_set_block,
+};
+
+static int __devinit 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) {
+ dev_err(&pdev->dev, "Cannot alloc rfkill device\n");
+ ret = -ENOMEM;
+ goto err_rfkill_alloc;
+ }
+
+ if (regulator_is_enabled(vcc)) {
+ dev_dbg(&pdev->dev, "Regulator already enabled\n");
+ rfkill_data->reg_enabled = 1;
+ }
+ 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 __devexit 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 = __devexit_p(rfkill_regulator_remove),
+ .driver = {
+ .name = "rfkill-regulator",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init rfkill_regulator_init(void)
+{
+ return platform_driver_register(&rfkill_regulator_driver);
+}
+module_init(rfkill_regulator_init);
+
+static void __exit rfkill_regulator_exit(void)
+{
+ platform_driver_unregister(&rfkill_regulator_driver);
+}
+module_exit(rfkill_regulator_exit);
+
+MODULE_AUTHOR("Guiming Zhuo <gmzhuo@xxxxxxxxx>");
+MODULE_AUTHOR("Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rfkill-regulator");
--
1.7.4.1
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