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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2015-08-18 09:52:51 +0300
committerWolfram Sang <wsa@the-dreams.de>2015-08-26 19:47:58 +0300
commit3fffd12839273429a185d68431f117f0a3654b07 (patch)
tree0ff653d0f8f568de90074b13129a52884970874b /drivers/i2c/i2c-core.c
parent6602c452caf532893c1bde50aacda0bd17f958aa (diff)
downloadlinux-3fffd12839273429a185d68431f117f0a3654b07.tar.xz
i2c: allow specifying separate wakeup interrupt in device tree
Instead of having each i2c driver individually parse device tree data in case it or platform supports separate wakeup interrupt, and handle enabling and disabling wakeup interrupts in their power management routines, let's have i2c core do that for us. Platforms wishing to specify separate wakeup interrupt for the device should use named interrupt syntax in their DTSes: interrupt-parent = <&intc1>; interrupts = <5 0>, <6 0>; interrupt-names = "irq", "wakeup"; This patch is inspired by work done by Vignesh R <vigneshr@ti.com> for pixcir_i2c_ts driver. Note that the original code tried to preserve any existing wakeup settings from userspace but was not quite right in that regard: it would preserve wakeup flag set by userspace upon driver rebinding; but it would re-arm the wakeup flag if it was disabled by userspace. We think that resetting the flag upon re-binding the driver is proper behavior as the driver is responsible for setting up and handling wakeups. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Tested-by: Vignesh R <vigneshr@ti.com> [wsa: updated the commit message] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/i2c-core.c')
-rw-r--r--drivers/i2c/i2c-core.c51
1 files changed, 42 insertions, 9 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 98f6c75b1d18..5f89f1e3c2f2 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -48,6 +48,7 @@
#include <linux/rwsem.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
+#include <linux/pm_wakeirq.h>
#include <linux/acpi.h>
#include <linux/jump_label.h>
#include <asm/uaccess.h>
@@ -645,11 +646,13 @@ static int i2c_device_probe(struct device *dev)
if (!client->irq) {
int irq = -ENOENT;
- if (dev->of_node)
- irq = of_irq_get(dev->of_node, 0);
- else if (ACPI_COMPANION(dev))
+ if (dev->of_node) {
+ irq = of_irq_get_byname(dev->of_node, "irq");
+ if (irq == -EINVAL || irq == -ENODATA)
+ irq = of_irq_get(dev->of_node, 0);
+ } else if (ACPI_COMPANION(dev)) {
irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
-
+ }
if (irq == -EPROBE_DEFER)
return irq;
if (irq < 0)
@@ -662,23 +665,49 @@ static int i2c_device_probe(struct device *dev)
if (!driver->probe || !driver->id_table)
return -ENODEV;
- if (!device_can_wakeup(&client->dev))
- device_init_wakeup(&client->dev,
- client->flags & I2C_CLIENT_WAKE);
+ if (client->flags & I2C_CLIENT_WAKE) {
+ int wakeirq = -ENOENT;
+
+ if (dev->of_node) {
+ wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
+ if (wakeirq == -EPROBE_DEFER)
+ return wakeirq;
+ }
+
+ device_init_wakeup(&client->dev, true);
+
+ if (wakeirq > 0 && wakeirq != client->irq)
+ status = dev_pm_set_dedicated_wake_irq(dev, wakeirq);
+ else if (client->irq > 0)
+ status = dev_pm_set_wake_irq(dev, wakeirq);
+ else
+ status = 0;
+
+ if (status)
+ dev_warn(&client->dev, "failed to set up wakeup irq");
+ }
+
dev_dbg(dev, "probe\n");
status = of_clk_set_defaults(dev->of_node, false);
if (status < 0)
- return status;
+ goto err_clear_wakeup_irq;
status = dev_pm_domain_attach(&client->dev, true);
if (status != -EPROBE_DEFER) {
status = driver->probe(client, i2c_match_id(driver->id_table,
client));
if (status)
- dev_pm_domain_detach(&client->dev, true);
+ goto err_detach_pm_domain;
}
+ return 0;
+
+err_detach_pm_domain:
+ dev_pm_domain_detach(&client->dev, true);
+err_clear_wakeup_irq:
+ dev_pm_clear_wake_irq(&client->dev);
+ device_init_wakeup(&client->dev, false);
return status;
}
@@ -698,6 +727,10 @@ static int i2c_device_remove(struct device *dev)
}
dev_pm_domain_detach(&client->dev, true);
+
+ dev_pm_clear_wake_irq(&client->dev);
+ device_init_wakeup(&client->dev, false);
+
return status;
}