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authorTodd Poynor <toddpoynor@google.com>2012-08-30 23:09:14 -0700
committerJohn Stultz <john.stultz@linaro.org>2016-02-16 13:54:18 -0800
commit84360d613010e7a363a06c8f7a555bbdf6824440 (patch)
treeb771981b900e3195d3aad0136f686ef472aff216 /drivers/w1
parentd111876c7ea15f9041c792c141fcfab5de8cf379 (diff)
w1: ds2482: Manage SLPZ pin sleep state
Place SLPZ pin in sleep state at system suspend time if a GPIO is provided by board platform data. Change-Id: I93c61fa0ae474e968e0f909209c9bfcaafe3dd2c Signed-off-by: Todd Poynor <toddpoynor@google.com>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/masters/ds2482.c47
1 files changed, 46 insertions, 1 deletions
diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
index b05e8fefbabd..03b2f8f41607 100644
--- a/drivers/w1/masters/ds2482.c
+++ b/drivers/w1/masters/ds2482.c
@@ -18,6 +18,8 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/platform_data/ds2482.h>
#include <asm/delay.h>
#include "../w1.h"
@@ -84,7 +86,8 @@ static const u8 ds2482_chan_rd[8] =
static int ds2482_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int ds2482_remove(struct i2c_client *client);
-
+static int ds2482_suspend(struct device *dev);
+static int ds2482_resume(struct device *dev);
/**
* Driver data (common to all clients)
@@ -95,9 +98,15 @@ static const struct i2c_device_id ds2482_id[] = {
};
MODULE_DEVICE_TABLE(i2c, ds2482_id);
+static const struct dev_pm_ops ds2482_pm_ops = {
+ .suspend = ds2482_suspend,
+ .resume = ds2482_resume,
+};
+
static struct i2c_driver ds2482_driver = {
.driver = {
.name = "ds2482",
+ .pm = &ds2482_pm_ops,
},
.probe = ds2482_probe,
.remove = ds2482_remove,
@@ -119,6 +128,7 @@ struct ds2482_w1_chan {
struct ds2482_data {
struct i2c_client *client;
struct mutex access_lock;
+ int slpz_gpio;
/* 1-wire interface(s) */
int w1_count; /* 1 or 8 */
@@ -444,11 +454,31 @@ static u8 ds2482_w1_set_pullup(void *data, int delay)
return retval;
}
+static int ds2482_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds2482_data *data = i2c_get_clientdata(client);
+
+ if (data->slpz_gpio >= 0)
+ gpio_set_value(data->slpz_gpio, 0);
+ return 0;
+}
+
+static int ds2482_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds2482_data *data = i2c_get_clientdata(client);
+
+ if (data->slpz_gpio >= 0)
+ gpio_set_value(data->slpz_gpio, 1);
+ return 0;
+}
static int ds2482_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ds2482_data *data;
+ struct ds2482_platform_data *pdata;
int err = -ENODEV;
int temp1;
int idx;
@@ -515,6 +545,16 @@ static int ds2482_probe(struct i2c_client *client,
}
}
+ pdata = client->dev.platform_data;
+ data->slpz_gpio = pdata ? pdata->slpz_gpio : -1;
+
+ if (data->slpz_gpio >= 0) {
+ err = gpio_request_one(data->slpz_gpio, GPIOF_OUT_INIT_HIGH,
+ "ds2482.slpz");
+ if (err < 0)
+ goto exit_w1_remove;
+ }
+
return 0;
exit_w1_remove:
@@ -539,6 +579,11 @@ static int ds2482_remove(struct i2c_client *client)
w1_remove_master_device(&data->w1_ch[idx].w1_bm);
}
+ if (data->slpz_gpio >= 0) {
+ gpio_set_value(data->slpz_gpio, 0);
+ gpio_free(data->slpz_gpio);
+ }
+
/* Free the memory */
kfree(data);
return 0;