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path: root/drivers/hwmon/lis3lv02d_i2c.c
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Diffstat (limited to 'drivers/hwmon/lis3lv02d_i2c.c')
-rw-r--r--drivers/hwmon/lis3lv02d_i2c.c132
1 files changed, 115 insertions, 17 deletions
diff --git a/drivers/hwmon/lis3lv02d_i2c.c b/drivers/hwmon/lis3lv02d_i2c.c
index 8e5933b72d19..9f4bae07f719 100644
--- a/drivers/hwmon/lis3lv02d_i2c.c
+++ b/drivers/hwmon/lis3lv02d_i2c.c
@@ -29,10 +29,30 @@
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
#include "lis3lv02d.h"
#define DRV_NAME "lis3lv02d_i2c"
+static const char reg_vdd[] = "Vdd";
+static const char reg_vdd_io[] = "Vdd_IO";
+
+static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
+{
+ int ret;
+ if (state == LIS3_REG_OFF) {
+ ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
+ lis3->regulators);
+ } else {
+ ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
+ lis3->regulators);
+ /* Chip needs time to wakeup. Not mentioned in datasheet */
+ usleep_range(10000, 20000);
+ }
+ return ret;
+}
+
static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
{
struct i2c_client *c = lis3->bus_priv;
@@ -46,24 +66,38 @@ static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
return 0;
}
+static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
+ u8 *v)
+{
+ struct i2c_client *c = lis3->bus_priv;
+ reg |= (1 << 7); /* 7th bit enables address auto incrementation */
+ return i2c_smbus_read_i2c_block_data(c, reg, len, v);
+}
+
static int lis3_i2c_init(struct lis3lv02d *lis3)
{
u8 reg;
int ret;
+ if (lis3->reg_ctrl)
+ lis3_reg_ctrl(lis3, LIS3_REG_ON);
+
+ lis3->read(lis3, WHO_AM_I, &reg);
+ if (reg != lis3->whoami)
+ printk(KERN_ERR "lis3: power on failure\n");
+
/* power up the device */
ret = lis3->read(lis3, CTRL_REG1, &reg);
if (ret < 0)
return ret;
- reg |= CTRL1_PD0;
+ reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
return lis3->write(lis3, CTRL_REG1, reg);
}
/* Default axis mapping but it can be overwritten by platform data */
-static struct axis_conversion lis3lv02d_axis_map = { LIS3_DEV_X,
- LIS3_DEV_Y,
- LIS3_DEV_Z };
+static union axis_conversion lis3lv02d_axis_map =
+ { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
@@ -72,6 +106,15 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
if (pdata) {
+ /* Regulator control is optional */
+ if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
+ lis3_dev.reg_ctrl = lis3_reg_ctrl;
+
+ if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
+ (i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_I2C_BLOCK)))
+ lis3_dev.blkread = lis3_i2c_blockread;
+
if (pdata->axis_x)
lis3lv02d_axis_map.x = pdata->axis_x;
@@ -88,6 +131,16 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
goto fail;
}
+ if (lis3_dev.reg_ctrl) {
+ lis3_dev.regulators[0].supply = reg_vdd;
+ lis3_dev.regulators[1].supply = reg_vdd_io;
+ ret = regulator_bulk_get(&client->dev,
+ ARRAY_SIZE(lis3_dev.regulators),
+ lis3_dev.regulators);
+ if (ret < 0)
+ goto fail;
+ }
+
lis3_dev.pdata = pdata;
lis3_dev.bus_priv = client;
lis3_dev.init = lis3_i2c_init;
@@ -95,10 +148,24 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
lis3_dev.write = lis3_i2c_write;
lis3_dev.irq = client->irq;
lis3_dev.ac = lis3lv02d_axis_map;
+ lis3_dev.pm_dev = &client->dev;
i2c_set_clientdata(client, &lis3_dev);
+
+ /* Provide power over the init call */
+ if (lis3_dev.reg_ctrl)
+ lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
+
ret = lis3lv02d_init_device(&lis3_dev);
+
+ if (lis3_dev.reg_ctrl)
+ lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
+
+ if (ret == 0)
+ return 0;
fail:
+ if (pdata && pdata->release_resources)
+ pdata->release_resources();
return ret;
}
@@ -111,14 +178,18 @@ static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
pdata->release_resources();
lis3lv02d_joystick_disable();
- lis3lv02d_poweroff(lis3);
+ lis3lv02d_remove_fs(&lis3_dev);
- return lis3lv02d_remove_fs(&lis3_dev);
+ if (lis3_dev.reg_ctrl)
+ regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
+ lis3_dev.regulators);
+ return 0;
}
#ifdef CONFIG_PM
-static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
+static int lis3lv02d_i2c_suspend(struct device *dev)
{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
@@ -126,18 +197,21 @@ static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
return 0;
}
-static int lis3lv02d_i2c_resume(struct i2c_client *client)
+static int lis3lv02d_i2c_resume(struct device *dev)
{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
- if (!lis3->pdata || !lis3->pdata->wakeup_flags)
+ /*
+ * pm_runtime documentation says that devices should always
+ * be powered on at resume. Pm_runtime turns them off after system
+ * wide resume is complete.
+ */
+ if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
+ pm_runtime_suspended(dev))
lis3lv02d_poweron(lis3);
- return 0;
-}
-static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
-{
- lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
+ return 0;
}
#else
#define lis3lv02d_i2c_suspend NULL
@@ -145,6 +219,24 @@ static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
#define lis3lv02d_i2c_shutdown NULL
#endif
+static int lis3_i2c_runtime_suspend(struct device *dev)
+{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+ struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+ lis3lv02d_poweroff(lis3);
+ return 0;
+}
+
+static int lis3_i2c_runtime_resume(struct device *dev)
+{
+ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+ struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+ lis3lv02d_poweron(lis3);
+ return 0;
+}
+
static const struct i2c_device_id lis3lv02d_id[] = {
{"lis3lv02d", 0 },
{}
@@ -152,14 +244,20 @@ static const struct i2c_device_id lis3lv02d_id[] = {
MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
+static const struct dev_pm_ops lis3_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
+ lis3lv02d_i2c_resume)
+ SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
+ lis3_i2c_runtime_resume,
+ NULL)
+};
+
static struct i2c_driver lis3lv02d_i2c_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
+ .pm = &lis3_pm_ops,
},
- .suspend = lis3lv02d_i2c_suspend,
- .shutdown = lis3lv02d_i2c_shutdown,
- .resume = lis3lv02d_i2c_resume,
.probe = lis3lv02d_i2c_probe,
.remove = __devexit_p(lis3lv02d_i2c_remove),
.id_table = lis3lv02d_id,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 21:34:22 +0000