target/linux/generic/patches-3.19/834-ledtrig-libata.patch

   1 From 52cfd51cdf6a6e14d4fb270c6343abac3bac00f4 Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Fri, 12 Dec 2014 13:38:33 +0100
   4 Subject: [PATCH] libata: add ledtrig support
   5 To: linux-ide@vger.kernel.org,
   6     Tejun Heo <tj@kernel.org>
   7
   8 This adds a LED trigger for each ATA port indicating disk activity.
   9
  10 As this is needed only on specific platforms (NAS SoCs and such),
  11 these platforms should define ARCH_WANTS_LIBATA_LEDS if there
  12 are boards with LED(s) intended to indicate ATA disk activity and
  13 need the OS to take care of that.
  14 In that way, if not selected, LED trigger support not will be
  15 included in libata-core and both, codepaths and structures remain
  16 untouched.
  17
  18 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  19 ---
  20  drivers/ata/Kconfig       | 16 ++++++++++++++++
  21  drivers/ata/libata-core.c | 41 +++++++++++++++++++++++++++++++++++++++++
  22  include/linux/libata.h    |  9 +++++++++
  23  3 files changed, 66 insertions(+)
  24
  25 --- a/drivers/ata/Kconfig
  26 +++ b/drivers/ata/Kconfig
  27 @@ -46,6 +46,22 @@ config ATA_VERBOSE_ERROR
  28
  29           If unsure, say Y.
  30
  31 +config ARCH_WANT_LIBATA_LEDS
  32 +       bool
  33 +
  34 +config ATA_LEDS
  35 +       bool "support ATA port LED triggers"
  36 +       depends on ARCH_WANT_LIBATA_LEDS
  37 +       select NEW_LEDS
  38 +       select LEDS_CLASS
  39 +       select LEDS_TRIGGERS
  40 +       default y
  41 +       help
  42 +         This option adds a LED trigger for each registered ATA port.
  43 +         It is used to drive disk activity leds connected via GPIO.
  44 +
  45 +         If unsure, say N.
  46 +
  47  config ATA_ACPI
  48         bool "ATA ACPI Support"
  49         depends on ACPI && PCI
  50 --- a/drivers/ata/libata-core.c
  51 +++ b/drivers/ata/libata-core.c
  52 @@ -725,6 +725,19 @@ u64 ata_tf_read_block(struct ata_taskfil
  53         return block;
  54  }
  55
  56 +#ifdef CONFIG_ATA_LEDS
  57 +#define LIBATA_BLINK_DELAY 20 /* ms */
  58 +static inline void ata_led_act(struct ata_port *ap)
  59 +{
  60 +       unsigned long led_delay = LIBATA_BLINK_DELAY;
  61 +
  62 +       if (unlikely(!ap->ledtrig))
  63 +               return;
  64 +
  65 +       led_trigger_blink_oneshot(ap->ledtrig, &led_delay, &led_delay, 0);
  66 +}
  67 +#endif
  68 +
  69  /**
  70   *     ata_build_rw_tf - Build ATA taskfile for given read/write request
  71   *     @tf: Target ATA taskfile
  72 @@ -4787,6 +4800,9 @@ static struct ata_queued_cmd *ata_qc_new
  73                         break;
  74                 }
  75         }
  76 +#ifdef CONFIG_ATA_LEDS
  77 +       ata_led_act(ap);
  78 +#endif
  79
  80         return qc;
  81  }
  82 @@ -5697,6 +5713,9 @@ struct ata_port *ata_port_alloc(struct a
  83         ap->stats.unhandled_irq = 1;
  84         ap->stats.idle_irq = 1;
  85  #endif
  86 +#ifdef CONFIG_ATA_LEDS
  87 +       ap->ledtrig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  88 +#endif
  89         ata_sff_port_init(ap);
  90
  91         return ap;
  92 @@ -5718,6 +5737,12 @@ static void ata_host_release(struct devi
  93
  94                 kfree(ap->pmp_link);
  95                 kfree(ap->slave_link);
  96 +#ifdef CONFIG_ATA_LEDS
  97 +               if (ap->ledtrig) {
  98 +                       led_trigger_unregister(ap->ledtrig);
  99 +                       kfree(ap->ledtrig);
 100 +               };
 101 +#endif
 102                 kfree(ap);
 103                 host->ports[i] = NULL;
 104         }
 105 @@ -6164,7 +6189,23 @@ int ata_host_register(struct ata_host *h
 106                 host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
 107                 host->ports[i]->local_port_no = i + 1;
 108         }
 109 +#ifdef CONFIG_ATA_LEDS
 110 +       for (i = 0; i < host->n_ports; i++) {
 111 +               if (unlikely(!host->ports[i]->ledtrig))
 112 +                       continue;
 113
 114 +               snprintf(host->ports[i]->ledtrig_name,
 115 +                       sizeof(host->ports[i]->ledtrig_name), "ata%u",
 116 +                       host->ports[i]->print_id);
 117 +
 118 +               host->ports[i]->ledtrig->name = host->ports[i]->ledtrig_name;
 119 +
 120 +               if (led_trigger_register(host->ports[i]->ledtrig)) {
 121 +                       kfree(host->ports[i]->ledtrig);
 122 +                       host->ports[i]->ledtrig = NULL;
 123 +               }
 124 +       }
 125 +#endif
 126         /* Create associated sysfs transport objects  */
 127         for (i = 0; i < host->n_ports; i++) {
 128                 rc = ata_tport_add(host->dev,host->ports[i]);
 129 --- a/include/linux/libata.h
 130 +++ b/include/linux/libata.h
 131 @@ -38,6 +38,9 @@
 132  #include <linux/acpi.h>
 133  #include <linux/cdrom.h>
 134  #include <linux/sched.h>
 135 +#ifdef CONFIG_ATA_LEDS
 136 +#include <linux/leds.h>
 137 +#endif
 138
 139  /*
 140   * Define if arch has non-standard setup.  This is a _PCI_ standard
 141 @@ -864,6 +867,12 @@ struct ata_port {
 142  #ifdef CONFIG_ATA_ACPI
 143         struct ata_acpi_gtm     __acpi_init_gtm; /* use ata_acpi_init_gtm() */
 144  #endif
 145 +
 146 +#ifdef CONFIG_ATA_LEDS
 147 +       struct led_trigger      *ledtrig;
 148 +       char                    ledtrig_name[8];
 149 +#endif
 150 +
 151         /* owned by EH */
 152         u8                      sector_buf[ATA_SECT_SIZE] ____cacheline_aligned;
 153  };