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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2017-03-01 11:45:51 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-04-01 09:36:19 -0700
commit4124c4eba40256b65acb5016a1edfdd59a1960b6 (patch)
tree6e4ca51577d3df12ada66b8bc62abfd7d444c5a7 /drivers/i2c
parent0daaf99d8424f12cdf87e00c435c9cb93667f519 (diff)
downloadlinux-4124c4eba40256b65acb5016a1edfdd59a1960b6.tar.bz2
i2c: allow attaching IRQ resources to i2c_board_info
Simple integer for interrupt number is not expressive enough, as it does not convey interrupt trigger type that should be used. Let's allow attaching array of resources to the board info and have i2c core parse first IRQ resource and set up interrupt trigger as needed. Reviewed-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-boardinfo.c12
-rw-r--r--drivers/i2c/i2c-core.c30
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-boardinfo.c b/drivers/i2c/i2c-boardinfo.c
index 0e285c68b2ff..31186ead5a40 100644
--- a/drivers/i2c/i2c-boardinfo.c
+++ b/drivers/i2c/i2c-boardinfo.c
@@ -90,6 +90,18 @@ int i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsig
}
}
+ if (info->resources) {
+ devinfo->board_info.resources =
+ kmemdup(info->resources,
+ info->num_resources *
+ sizeof(*info->resources),
+ GFP_KERNEL);
+ if (!devinfo->board_info.resources) {
+ status = -ENOMEM;
+ break;
+ }
+ }
+
list_add_tail(&devinfo->list, &__i2c_board_list);
}
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index bf7892e3b0c8..679a31fcb6d6 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1278,6 +1278,32 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
i2c_encode_flags_to_addr(client));
}
+static int i2c_dev_irq_from_resources(const struct resource *resources,
+ unsigned int num_resources)
+{
+ struct irq_data *irqd;
+ int i;
+
+ for (i = 0; i < num_resources; i++) {
+ const struct resource *r = &resources[i];
+
+ if (resource_type(r) != IORESOURCE_IRQ)
+ continue;
+
+ if (r->flags & IORESOURCE_BITS) {
+ irqd = irq_get_irq_data(r->start);
+ if (!irqd)
+ break;
+
+ irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
+ }
+
+ return r->start;
+ }
+
+ return 0;
+}
+
/**
* i2c_new_device - instantiate an i2c device
* @adap: the adapter managing the device
@@ -1313,7 +1339,11 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
client->flags = info->flags;
client->addr = info->addr;
+
client->irq = info->irq;
+ if (!client->irq)
+ client->irq = i2c_dev_irq_from_resources(info->resources,
+ info->num_resources);
strlcpy(client->name, info->type, sizeof(client->name));