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148 lines
4.4 KiB
148 lines
4.4 KiB
From 5f6f6af41e39677c9b722376a4088d10732cdd44 Mon Sep 17 00:00:00 2001
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From: Chen-Yu Tsai <wens@csie.org>
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Date: Fri, 17 Jan 2014 14:47:26 +0800
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Subject: [PATCH] net: rfkill: gpio: fix gpio name buffer size off by 1
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snprintf should be passed the complete size of the buffer, including
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the space for '\0'. The previous code resulted in the *_reset and
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*_shutdown strings being truncated.
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Signed-off-by: Chen-Yu Tsai <wens@csie.org>
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---
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net/rfkill/rfkill-gpio.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/net/rfkill/rfkill-gpio.c
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+++ b/net/rfkill/rfkill-gpio.c
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@@ -26,6 +26,7 @@
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/gpio/consumer.h>
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+#include <linux/of_gpio.h>
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#include <linux/rfkill-gpio.h>
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@@ -39,6 +40,7 @@ struct rfkill_gpio_data {
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char *reset_name;
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char *shutdown_name;
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struct clk *clk;
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+ int clk_frequency;
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bool clk_enabled;
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};
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@@ -51,15 +53,15 @@ static int rfkill_gpio_set_power(void *d
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gpiod_set_value(rfkill->shutdown_gpio, 0);
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gpiod_set_value(rfkill->reset_gpio, 0);
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if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
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- clk_disable(rfkill->clk);
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+ clk_disable_unprepare(rfkill->clk);
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} else {
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if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
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- clk_enable(rfkill->clk);
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+ clk_prepare_enable(rfkill->clk);
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gpiod_set_value(rfkill->reset_gpio, 1);
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gpiod_set_value(rfkill->shutdown_gpio, 1);
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}
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- rfkill->clk_enabled = blocked;
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+ rfkill->clk_enabled = !blocked;
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return 0;
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}
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@@ -83,6 +85,19 @@ static int rfkill_gpio_acpi_probe(struct
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return 0;
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}
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+static int rfkill_gpio_dt_probe(struct device *dev,
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+ struct rfkill_gpio_data *rfkill)
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+{
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+ struct device_node * np = dev->of_node;
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+
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+ rfkill->name = np->name;
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+ of_property_read_string(np, "rfkill-name", &rfkill->name);
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+ of_property_read_u32(np, "rfkill-type", &rfkill->type);
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+ of_property_read_u32(np, "clock-frequency", &rfkill->clk_frequency);
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+
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+ return 0;
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+}
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+
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static int rfkill_gpio_probe(struct platform_device *pdev)
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{
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struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
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@@ -100,6 +115,10 @@ static int rfkill_gpio_probe(struct plat
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ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
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if (ret)
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return ret;
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+ } else if (&pdev->dev.of_node) {
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+ ret = rfkill_gpio_dt_probe(&pdev->dev, rfkill);
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+ if (ret)
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+ return ret;
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} else if (pdata) {
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clk_name = pdata->power_clk_name;
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rfkill->name = pdata->name;
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@@ -117,10 +136,12 @@ static int rfkill_gpio_probe(struct plat
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if (!rfkill->shutdown_name)
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return -ENOMEM;
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- snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name);
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- snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name);
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+ snprintf(rfkill->reset_name, len + 7 , "%s_reset", rfkill->name);
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+ snprintf(rfkill->shutdown_name, len + 10, "%s_shutdown", rfkill->name);
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rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
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+ if (!IS_ERR(rfkill->clk) && rfkill->clk_frequency > 0)
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+ clk_set_rate(rfkill->clk, rfkill->clk_frequency);
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gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0);
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if (!IS_ERR(gpio)) {
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@@ -189,6 +210,11 @@ static const struct acpi_device_id rfkil
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{ },
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};
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+static const struct of_device_id rfkill_of_match[] = {
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+ { .compatible = "rfkill-gpio", },
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+ {},
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+};
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+
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static struct platform_driver rfkill_gpio_driver = {
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.probe = rfkill_gpio_probe,
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.remove = rfkill_gpio_remove,
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@@ -196,6 +222,7 @@ static struct platform_driver rfkill_gpi
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.name = "rfkill_gpio",
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.owner = THIS_MODULE,
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.acpi_match_table = ACPI_PTR(rfkill_acpi_match),
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+ .of_match_table = of_match_ptr(rfkill_of_match),
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},
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};
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/rfkill/rfkill-gpio.txt
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@@ -0,0 +1,28 @@
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+GPIO controlled RFKILL devices
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+
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+Required properties:
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+- compatible : Must be "rfkill-gpio".
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+- rfkill-name : Name of RFKILL device
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+- rfkill-type : Type of RFKILL device: 1 for WiFi, 2 for BlueTooth
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+- NAME_shutdown-gpios : GPIO phandle to shutdown control
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+ (phandle must be the second)
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+- NAME_reset-gpios : GPIO phandle to reset control
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+
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+NAME must match the rfkill-name property. NAME_shutdown-gpios or
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+NAME_reset-gpios, or both, must be defined.
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+
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+Optional properties:
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+- clocks : phandle to clock to enable/disable
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+- clock-frequency : clock rate to set for the given clock
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+
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+Example:
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+
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+ rfkill_bt: rfkill@0 {
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+ compatible = "rfkill-gpio";
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+ rfkill-name = "bluetooth";
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+ rfkill-type = <2>;
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+ bluetooth_shutdown-gpios = <0>, <&pio 7 18 0>;
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+ bluetooth_reset-gpios = <&pio 7 24 0>;
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+ clocks = <&clk_out_a>;
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+ clock-frequency = <32678>;
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+ };
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