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179 lines
4.9 KiB
Diff
179 lines
4.9 KiB
Diff
From 5843af891d0dabf9bb80039cfe807d01e9495154 Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel at makrotopia.org>
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Date: Fri, 12 Dec 2014 13:38:33 +0100
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Subject: libata: add ledtrig support
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This adds a LED trigger for each ATA port indicating disk activity.
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As this is needed only on specific platforms (NAS SoCs and such),
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these platforms should define ARCH_WANTS_LIBATA_LEDS if there
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are boards with LED(s) intended to indicate ATA disk activity and
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need the OS to take care of that.
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In that way, if not selected, LED trigger support not will be
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included in libata-core and both, codepaths and structures remain
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untouched.
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Signed-off-by: Daniel Golle <daniel at makrotopia.org>
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---
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drivers/ata/Kconfig | 16 ++++++++++++++
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drivers/ata/libata-core.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++
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include/linux/libata.h | 7 ++++++
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3 files changed, 79 insertions(+)
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diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
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index 6aaa3f8..4e24b64 100644
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--- a/drivers/ata/Kconfig
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+++ b/drivers/ata/Kconfig
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@@ -46,6 +46,22 @@ config ATA_VERBOSE_ERROR
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If unsure, say Y.
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+config ARCH_WANT_LIBATA_LEDS
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+ bool
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+
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+config ATA_LEDS
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+ bool "support ATA port LED triggers"
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+ depends on ARCH_WANT_LIBATA_LEDS
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+ select NEW_LEDS
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+ select LEDS_CLASS
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+ select LEDS_TRIGGERS
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+ default y
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+ help
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+ This option adds a LED trigger for each registered ATA port.
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+ It is used to drive disk activity leds connected via GPIO.
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+
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+ If unsure, say N.
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+
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config ATA_ACPI
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bool "ATA ACPI Support"
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depends on ACPI
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diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
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index b0b77b6..1400f4d 100644
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--- a/drivers/ata/libata-core.c
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+++ b/drivers/ata/libata-core.c
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@@ -728,6 +728,7 @@ u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
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return block;
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}
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+
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/**
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* ata_build_rw_tf - Build ATA taskfile for given read/write request
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* @tf: Target ATA taskfile
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@@ -4757,6 +4758,30 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words)
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}
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/**
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+ * ata_led_act - Trigger port activity LED
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+ * @ap: indicating port
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+ *
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+ * Blinks any LEDs registered to the trigger.
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+ * Commonly used with leds-gpio on NAS systems with disk activity
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+ * indicator LEDs.
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+ *
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+ * LOCKING:
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+ * None.
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+ */
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+static inline void ata_led_act(struct ata_port *ap)
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+{
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+#if CONFIG_ATA_LEDS
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+#define LIBATA_BLINK_DELAY 20 /* ms */
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+ unsigned long led_delay = LIBATA_BLINK_DELAY;
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+
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+ if (unlikely(!ap->ledtrig))
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+ return;
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+
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+ led_trigger_blink_oneshot(ap->ledtrig, &led_delay, &led_delay, 0);
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+#endif /* CONFIG_ATA_LEDS */
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+}
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+
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+/**
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* ata_qc_new_init - Request an available ATA command, and initialize it
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* @dev: Device from whom we request an available command structure
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* @tag: tag
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@@ -4780,6 +4805,9 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
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if (tag < 0)
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return NULL;
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}
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+#if CONFIG_ATA_LEDS
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+ ata_led_act(ap);
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+#endif
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qc = __ata_qc_from_tag(ap, tag);
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qc->tag = tag;
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@@ -5677,6 +5705,9 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
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ap->stats.unhandled_irq = 1;
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ap->stats.idle_irq = 1;
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#endif
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+#if CONFIG_ATA_LEDS
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+ ap->ledtrig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
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+#endif
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ata_sff_port_init(ap);
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return ap;
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@@ -5698,6 +5729,12 @@ static void ata_host_release(struct device *gendev, void *res)
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kfree(ap->pmp_link);
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kfree(ap->slave_link);
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+#if CONFIG_ATA_LEDS
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+ if (ap->ledtrig) {
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+ led_trigger_unregister(ap->ledtrig);
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+ kfree(ap->ledtrig);
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+ };
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+#endif
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kfree(ap);
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host->ports[i] = NULL;
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}
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@@ -6145,6 +6182,25 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
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host->ports[i]->local_port_no = i + 1;
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}
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+#if CONFIG_ATA_LEDS
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+ /* register LED triggers for all ports */
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+ for (i = 0; i < host->n_ports; i++) {
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+ if (unlikely(!host->ports[i]->ledtrig))
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+ continue;
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+
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+ snprintf(host->ports[i]->ledtrig_name,
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+ sizeof(host->ports[i]->ledtrig_name), "ata%u",
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+ host->ports[i]->print_id);
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+
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+ host->ports[i]->ledtrig->name = host->ports[i]->ledtrig_name;
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+
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+ if (led_trigger_register(host->ports[i]->ledtrig)) {
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+ kfree(host->ports[i]->ledtrig);
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+ host->ports[i]->ledtrig = NULL;
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+ }
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+ }
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+#endif
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+
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/* Create associated sysfs transport objects */
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for (i = 0; i < host->n_ports; i++) {
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rc = ata_tport_add(host->dev,host->ports[i]);
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diff --git a/include/linux/libata.h b/include/linux/libata.h
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index b20a275..50eeee3 100644
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--- a/include/linux/libata.h
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+++ b/include/linux/libata.h
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@@ -38,6 +38,7 @@
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#include <linux/acpi.h>
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#include <linux/cdrom.h>
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#include <linux/sched.h>
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+#include <linux/leds.h>
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/*
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* Define if arch has non-standard setup. This is a _PCI_ standard
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@@ -877,6 +878,12 @@ struct ata_port {
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#ifdef CONFIG_ATA_ACPI
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struct ata_acpi_gtm __acpi_init_gtm; /* use ata_acpi_init_gtm() */
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#endif
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+
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+#ifdef CONFIG_ATA_LEDS
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+ struct led_trigger *ledtrig;
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+ char ledtrig_name[8];
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+#endif
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+
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/* owned by EH */
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u8 sector_buf[ATA_SECT_SIZE] ____cacheline_aligned;
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};
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--
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2.7.4
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