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297 lines
7.3 KiB
Diff
297 lines
7.3 KiB
Diff
From f3c1830096661e270f11f2a33ffb7274f50c90a6 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 18 Dec 2014 16:48:32 +0000
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Subject: [PATCH 068/114] lirc-rpi: Add device tree support, and a suitable
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overlay
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The overlay supports DT parameters that match the old module
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parameters, except that gpio_in_pull should be set using the
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strings "up", "down" or "off".
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lirc-rpi: Also support pinctrl-bcm2835 in non-DT mode
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---
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arch/arm/boot/dts/lirc-rpi-overlay.dts | 57 ++++++++++++
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drivers/staging/media/lirc/lirc_rpi.c | 154 +++++++++++++++++++++++++++------
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2 files changed, 183 insertions(+), 28 deletions(-)
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create mode 100644 arch/arm/boot/dts/lirc-rpi-overlay.dts
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--- /dev/null
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+++ b/arch/arm/boot/dts/lirc-rpi-overlay.dts
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@@ -0,0 +1,57 @@
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+// Definitions for lirc-rpi module
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ lirc_rpi: lirc_rpi {
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+ compatible = "rpi,lirc-rpi";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&lirc_pins>;
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+ status = "okay";
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+
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+ // Override autodetection of IR receiver circuit
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+ // (0 = active high, 1 = active low, -1 = no override )
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+ rpi,sense = <0xffffffff>;
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+
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+ // Software carrier
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+ // (0 = off, 1 = on)
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+ rpi,softcarrier = <1>;
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+
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+ // Invert output
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+ // (0 = off, 1 = on)
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+ rpi,invert = <0>;
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+
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+ // Enable debugging messages
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+ // (0 = off, 1 = on)
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+ rpi,debug = <0>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ lirc_pins: lirc_pins {
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+ brcm,pins = <17 18>;
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+ brcm,function = <1 0>; // out in
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+ brcm,pull = <0 1>; // off down
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ gpio_out_pin = <&lirc_pins>,"brcm,pins:0";
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+ gpio_in_pin = <&lirc_pins>,"brcm,pins:4";
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+ gpio_in_pull = <&lirc_pins>,"brcm,pull:4";
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+
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+ sense = <&lirc_rpi>,"rpi,sense:0";
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+ softcarrier = <&lirc_rpi>,"rpi,softcarrier:0";
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+ invert = <&lirc_rpi>,"rpi,invert:0";
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+ debug = <&lirc_rpi>,"rpi,debug:0";
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+ };
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+};
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--- a/drivers/staging/media/lirc/lirc_rpi.c
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+++ b/drivers/staging/media/lirc/lirc_rpi.c
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@@ -40,6 +40,7 @@
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#include <media/lirc_dev.h>
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#include <mach/gpio.h>
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#include <linux/gpio.h>
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+#include <linux/of_platform.h>
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#include <linux/platform_data/bcm2708.h>
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@@ -295,32 +296,117 @@ static int is_right_chip(struct gpio_chi
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return 0;
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}
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+static inline int read_bool_property(const struct device_node *np,
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+ const char *propname,
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+ bool *out_value)
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+{
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+ u32 value = 0;
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+ int err = of_property_read_u32(np, propname, &value);
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+ if (err == 0)
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+ *out_value = (value != 0);
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+ return err;
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+}
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+
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+static void read_pin_settings(struct device_node *node)
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+{
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+ u32 pin;
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+ int index;
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+
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+ for (index = 0;
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+ of_property_read_u32_index(
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+ node,
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+ "brcm,pins",
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+ index,
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+ &pin) == 0;
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+ index++) {
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+ u32 function;
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+ int err;
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+ err = of_property_read_u32_index(
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+ node,
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+ "brcm,function",
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+ index,
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+ &function);
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+ if (err == 0) {
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+ if (function == 1) /* Output */
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+ gpio_out_pin = pin;
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+ else if (function == 0) /* Input */
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+ gpio_in_pin = pin;
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+ }
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+ }
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+}
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+
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static int init_port(void)
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{
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int i, nlow, nhigh, ret;
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+ struct device_node *node;
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+
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+ node = lirc_rpi_dev->dev.of_node;
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gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
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- if (!gpiochip)
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+ /*
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+ * Because of the lack of a setpull function, only support
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+ * pinctrl-bcm2835 if using device tree.
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+ */
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+ if (!gpiochip && node)
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+ gpiochip = gpiochip_find("pinctrl-bcm2835", is_right_chip);
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+
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+ if (!gpiochip) {
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+ pr_err(LIRC_DRIVER_NAME ": gpio chip not found!\n");
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return -ENODEV;
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+ }
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+
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+ if (node) {
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+ struct device_node *pins_node;
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+
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+ pins_node = of_parse_phandle(node, "pinctrl-0", 0);
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+ if (!pins_node) {
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+ printk(KERN_ERR LIRC_DRIVER_NAME
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+ ": pinctrl settings not found!\n");
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+ ret = -EINVAL;
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+ goto exit_init_port;
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+ }
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+
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+ read_pin_settings(pins_node);
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+
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+ of_property_read_u32(node, "rpi,sense", &sense);
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+
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+ read_bool_property(node, "rpi,softcarrier", &softcarrier);
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+
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+ read_bool_property(node, "rpi,invert", &invert);
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+
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+ read_bool_property(node, "rpi,debug", &debug);
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+
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+ }
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+ else
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+ {
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+ if (gpio_in_pin >= BCM2708_NR_GPIOS ||
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+ gpio_out_pin >= BCM2708_NR_GPIOS) {
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+ ret = -EINVAL;
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+ printk(KERN_ERR LIRC_DRIVER_NAME
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+ ": invalid GPIO pin(s) specified!\n");
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+ goto exit_init_port;
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+ }
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+
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+ if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
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+ printk(KERN_ALERT LIRC_DRIVER_NAME
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+ ": cant claim gpio pin %d\n", gpio_out_pin);
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+ ret = -ENODEV;
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+ goto exit_init_port;
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+ }
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+
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+ if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
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+ printk(KERN_ALERT LIRC_DRIVER_NAME
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+ ": cant claim gpio pin %d\n", gpio_in_pin);
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+ ret = -ENODEV;
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+ goto exit_gpio_free_out_pin;
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+ }
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+
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+ bcm2708_gpio_setpull(gpiochip, gpio_in_pin, gpio_in_pull);
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+ gpiochip->direction_input(gpiochip, gpio_in_pin);
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+ gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
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+ }
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- if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
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- printk(KERN_ALERT LIRC_DRIVER_NAME
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- ": cant claim gpio pin %d\n", gpio_out_pin);
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- ret = -ENODEV;
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- goto exit_init_port;
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- }
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-
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- if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
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- printk(KERN_ALERT LIRC_DRIVER_NAME
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- ": cant claim gpio pin %d\n", gpio_in_pin);
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- ret = -ENODEV;
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- goto exit_gpio_free_out_pin;
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- }
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-
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- bcm2708_gpio_setpull(gpiochip, gpio_in_pin, gpio_in_pull);
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- gpiochip->direction_input(gpiochip, gpio_in_pin);
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- gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
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gpiochip->set(gpiochip, gpio_out_pin, invert);
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irq_num = gpiochip->to_irq(gpiochip, gpio_in_pin);
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@@ -514,15 +600,23 @@ static struct lirc_driver driver = {
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.owner = THIS_MODULE,
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};
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+static const struct of_device_id lirc_rpi_of_match[] = {
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+ { .compatible = "rpi,lirc-rpi", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, lirc_rpi_of_match);
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+
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static struct platform_driver lirc_rpi_driver = {
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.driver = {
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.name = LIRC_DRIVER_NAME,
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.owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(lirc_rpi_of_match),
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},
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};
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static int __init lirc_rpi_init(void)
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{
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+ struct device_node *node;
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int result;
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/* Init read buffer. */
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@@ -537,15 +631,26 @@ static int __init lirc_rpi_init(void)
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goto exit_buffer_free;
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}
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- lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
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- if (!lirc_rpi_dev) {
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- result = -ENOMEM;
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- goto exit_driver_unregister;
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- }
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+ node = of_find_compatible_node(NULL, NULL,
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+ lirc_rpi_of_match[0].compatible);
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- result = platform_device_add(lirc_rpi_dev);
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- if (result)
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- goto exit_device_put;
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+ if (node) {
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+ /* DT-enabled */
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+ lirc_rpi_dev = of_find_device_by_node(node);
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+ WARN_ON(lirc_rpi_dev->dev.of_node != node);
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+ of_node_put(node);
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+ }
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+ else {
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+ lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
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+ if (!lirc_rpi_dev) {
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+ result = -ENOMEM;
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+ goto exit_driver_unregister;
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+ }
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+
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+ result = platform_device_add(lirc_rpi_dev);
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+ if (result)
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+ goto exit_device_put;
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+ }
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return 0;
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@@ -577,13 +682,6 @@ static int __init lirc_rpi_init_module(v
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if (result)
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return result;
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- if (gpio_in_pin >= BCM2708_NR_GPIOS || gpio_out_pin >= BCM2708_NR_GPIOS) {
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- result = -EINVAL;
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- printk(KERN_ERR LIRC_DRIVER_NAME
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- ": invalid GPIO pin(s) specified!\n");
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- goto exit_rpi;
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- }
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-
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result = init_port();
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if (result < 0)
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goto exit_rpi;
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