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authorRhyland Klein <rklein@nvidia.com>2011-05-16 14:41:48 -0700
committerJohn W. Linville <linville@tuxdriver.com>2011-05-19 13:53:54 -0400
commit7176ba23f8b589b1df3229574ff46fb904ce9ec5 (patch)
treee0811eed20f2f636c217f719862a63b6652543b8 /net/rfkill
parentc6820f1e6c8273ca4b8f94c2354193d19e1a5c47 (diff)
downloadlinux-stericsson-7176ba23f8b589b1df3229574ff46fb904ce9ec5.tar.gz
net: rfkill: add generic gpio rfkill driver
This adds a new generic gpio rfkill driver to support rfkill switches which are controlled by gpios. The driver also supports passing in data about the clock for the radio, so that when rfkill is blocking, it can disable the clock. This driver assumes platform data is passed from the board files to configure it for specific devices. Original-patch-by: Anantha Idapalapati <aidapalapati@nvidia.com> Signed-off-by: Rhyland Klein <rklein@nvidia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/rfkill')
-rw-r--r--net/rfkill/Kconfig9
-rw-r--r--net/rfkill/Makefile1
-rw-r--r--net/rfkill/rfkill-gpio.c227
3 files changed, 237 insertions, 0 deletions
diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
index 48464ca13b24..78efe895b663 100644
--- a/net/rfkill/Kconfig
+++ b/net/rfkill/Kconfig
@@ -33,3 +33,12 @@ config RFKILL_REGULATOR
To compile this driver as a module, choose M here: the module will
be called rfkill-regulator.
+
+config RFKILL_GPIO
+ tristate "GPIO RFKILL driver"
+ depends on RFKILL && GPIOLIB && HAVE_CLK
+ default n
+ help
+ If you say yes here you get support of a generic gpio RFKILL
+ driver. The platform should fill in the appropriate fields in the
+ rfkill_gpio_platform_data structure and pass that to the driver.
diff --git a/net/rfkill/Makefile b/net/rfkill/Makefile
index d9a5a58ffd8c..311768783f4a 100644
--- a/net/rfkill/Makefile
+++ b/net/rfkill/Makefile
@@ -6,3 +6,4 @@ rfkill-y += core.o
rfkill-$(CONFIG_RFKILL_INPUT) += input.o
obj-$(CONFIG_RFKILL) += rfkill.o
obj-$(CONFIG_RFKILL_REGULATOR) += rfkill-regulator.o
+obj-$(CONFIG_RFKILL_GPIO) += rfkill-gpio.o
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
new file mode 100644
index 000000000000..256c5ddd2d72
--- /dev/null
+++ b/net/rfkill/rfkill-gpio.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/rfkill.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+#include <linux/rfkill-gpio.h>
+
+enum rfkill_gpio_clk_state {
+ UNSPECIFIED = 0,
+ PWR_ENABLED,
+ PWR_DISABLED
+};
+
+#define PWR_CLK_SET(_RF, _EN) \
+ ((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED))
+#define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED)
+#define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED)
+
+struct rfkill_gpio_data {
+ struct rfkill_gpio_platform_data *pdata;
+ struct rfkill *rfkill_dev;
+ char *reset_name;
+ char *shutdown_name;
+ enum rfkill_gpio_clk_state pwr_clk_enabled;
+ struct clk *pwr_clk;
+};
+
+static int rfkill_gpio_set_power(void *data, bool blocked)
+{
+ struct rfkill_gpio_data *rfkill = data;
+
+ if (blocked) {
+ if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
+ gpio_direction_output(rfkill->pdata->shutdown_gpio, 0);
+ if (gpio_is_valid(rfkill->pdata->reset_gpio))
+ gpio_direction_output(rfkill->pdata->reset_gpio, 0);
+ if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
+ clk_disable(rfkill->pwr_clk);
+ } else {
+ if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill))
+ clk_enable(rfkill->pwr_clk);
+ if (gpio_is_valid(rfkill->pdata->reset_gpio))
+ gpio_direction_output(rfkill->pdata->reset_gpio, 1);
+ if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
+ gpio_direction_output(rfkill->pdata->shutdown_gpio, 1);
+ }
+
+ if (rfkill->pwr_clk)
+ PWR_CLK_SET(rfkill, blocked);
+
+ return 0;
+}
+
+static const struct rfkill_ops rfkill_gpio_ops = {
+ .set_block = rfkill_gpio_set_power,
+};
+
+static int rfkill_gpio_probe(struct platform_device *pdev)
+{
+ struct rfkill_gpio_data *rfkill;
+ struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
+ int ret = 0;
+ int len = 0;
+
+ if (!pdata) {
+ pr_warn("%s: No platform data specified\n", __func__);
+ return -EINVAL;
+ }
+
+ /* make sure at-least one of the GPIO is defined and that
+ * a name is specified for this instance */
+ if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) &&
+ !gpio_is_valid(pdata->shutdown_gpio))) {
+ pr_warn("%s: invalid platform data\n", __func__);
+ return -EINVAL;
+ }
+
+ rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
+ if (!rfkill)
+ return -ENOMEM;
+
+ rfkill->pdata = pdata;
+
+ len = strlen(pdata->name);
+ rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL);
+ if (!rfkill->reset_name) {
+ ret = -ENOMEM;
+ goto fail_alloc;
+ }
+
+ rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);
+ if (!rfkill->shutdown_name) {
+ ret = -ENOMEM;
+ goto fail_reset_name;
+ }
+
+ snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);
+ snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name);
+
+ if (pdata->power_clk_name) {
+ rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name);
+ if (IS_ERR(rfkill->pwr_clk)) {
+ pr_warn("%s: can't find pwr_clk.\n", __func__);
+ goto fail_shutdown_name;
+ }
+ }
+
+ if (gpio_is_valid(pdata->reset_gpio)) {
+ ret = gpio_request(pdata->reset_gpio, rfkill->reset_name);
+ if (ret) {
+ pr_warn("%s: failed to get reset gpio.\n", __func__);
+ goto fail_clock;
+ }
+ }
+
+ if (gpio_is_valid(pdata->shutdown_gpio)) {
+ ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name);
+ if (ret) {
+ pr_warn("%s: failed to get shutdown gpio.\n", __func__);
+ goto fail_reset;
+ }
+ }
+
+ rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type,
+ &rfkill_gpio_ops, rfkill);
+ if (!rfkill->rfkill_dev)
+ goto fail_shutdown;
+
+ ret = rfkill_register(rfkill->rfkill_dev);
+ if (ret < 0)
+ goto fail_rfkill;
+
+ platform_set_drvdata(pdev, rfkill);
+
+ dev_info(&pdev->dev, "%s device registered.\n", pdata->name);
+
+ return 0;
+
+fail_rfkill:
+ rfkill_destroy(rfkill->rfkill_dev);
+fail_shutdown:
+ if (gpio_is_valid(pdata->shutdown_gpio))
+ gpio_free(pdata->shutdown_gpio);
+fail_reset:
+ if (gpio_is_valid(pdata->reset_gpio))
+ gpio_free(pdata->reset_gpio);
+fail_clock:
+ if (rfkill->pwr_clk)
+ clk_put(rfkill->pwr_clk);
+fail_shutdown_name:
+ kfree(rfkill->shutdown_name);
+fail_reset_name:
+ kfree(rfkill->reset_name);
+fail_alloc:
+ kfree(rfkill);
+
+ return ret;
+}
+
+static int rfkill_gpio_remove(struct platform_device *pdev)
+{
+ struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
+
+ rfkill_unregister(rfkill->rfkill_dev);
+ rfkill_destroy(rfkill->rfkill_dev);
+ if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
+ gpio_free(rfkill->pdata->shutdown_gpio);
+ if (gpio_is_valid(rfkill->pdata->reset_gpio))
+ gpio_free(rfkill->pdata->reset_gpio);
+ if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
+ clk_disable(rfkill->pwr_clk);
+ if (rfkill->pwr_clk)
+ clk_put(rfkill->pwr_clk);
+ kfree(rfkill->shutdown_name);
+ kfree(rfkill->reset_name);
+ kfree(rfkill);
+
+ return 0;
+}
+
+static struct platform_driver rfkill_gpio_driver = {
+ .probe = rfkill_gpio_probe,
+ .remove = __devexit_p(rfkill_gpio_remove),
+ .driver = {
+ .name = "rfkill_gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init rfkill_gpio_init(void)
+{
+ return platform_driver_register(&rfkill_gpio_driver);
+}
+
+static void __exit rfkill_gpio_exit(void)
+{
+ platform_driver_unregister(&rfkill_gpio_driver);
+}
+
+module_init(rfkill_gpio_init);
+module_exit(rfkill_gpio_exit);
+
+MODULE_DESCRIPTION("gpio rfkill");
+MODULE_AUTHOR("NVIDIA");
+MODULE_LICENSE("GPL");