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hwmon: lis3: regulator control 

Based on pm_runtime control, turn lis3 regulators on and off.
Perform context save and restore on transitions.

Feature is optional and must be enabled in platform data.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Samu Onkalo 2010-10-22 07:57:24 -04:00 committed by Guenter Roeck
parent 2a34699662
commit f9deb41f91
4 changed files with 121 additions and 1 deletions
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52
drivers/hwmon/lis3lv02d.c
View File

@ -31,6 +31,7 @@
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/freezer.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
@ -257,10 +258,46 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
return ret;
}
/*
* Order of registers in the list affects to order of the restore process.
* Perhaps it is a good idea to set interrupt enable register as a last one
* after all other configurations
*/
static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
CTRL_REG1, CTRL_REG2, CTRL_REG3};
static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
DD_THSE_L, DD_THSE_H,
CTRL_REG1, CTRL_REG3, CTRL_REG2};
static inline void lis3_context_save(struct lis3lv02d *lis3)
{
int i;
for (i = 0; i < lis3->regs_size; i++)
lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
lis3->regs_stored = true;
}
static inline void lis3_context_restore(struct lis3lv02d *lis3)
{
int i;
if (lis3->regs_stored)
for (i = 0; i < lis3->regs_size; i++)
lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
}
void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
if (lis3->reg_ctrl)
lis3_context_save(lis3);
/* disable X,Y,Z axis and power down */
lis3->write(lis3, CTRL_REG1, 0x00);
if (lis3->reg_ctrl)
lis3->reg_ctrl(lis3, LIS3_REG_OFF);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
@ -283,6 +320,8 @@ void lis3lv02d_poweron(struct lis3lv02d *lis3)
reg |= CTRL2_BDU;
lis3->write(lis3, CTRL_REG2, reg);
}
if (lis3->reg_ctrl)
lis3_context_restore(lis3);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
@ -674,6 +713,7 @@ int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
pm_runtime_disable(lis3->pm_dev);
pm_runtime_set_suspended(lis3->pm_dev);
}
kfree(lis3->reg_cache);
return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
@ -753,6 +793,8 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
dev->odrs = lis3_12_rates;
dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
dev->scale = LIS3_SENSITIVITY_12B;
dev->regs = lis3_wai12_regs;
dev->regs_size = ARRAY_SIZE(lis3_wai12_regs);
break;
case WAI_8B:
printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
@ -762,6 +804,8 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
dev->odrs = lis3_8_rates;
dev->odr_mask = CTRL1_DR;
dev->scale = LIS3_SENSITIVITY_8B;
dev->regs = lis3_wai8_regs;
dev->regs_size = ARRAY_SIZE(lis3_wai8_regs);
break;
case WAI_3DC:
printk(KERN_INFO DRIVER_NAME ": 8 bits 3DC sensor found\n");
@ -778,6 +822,14 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
return -EINVAL;
}
dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
sizeof(lis3_wai12_regs)), GFP_KERNEL);
if (dev->reg_cache == NULL) {
printk(KERN_ERR DRIVER_NAME "out of memory\n");
return -ENOMEM;
}
mutex_init(&dev->mutex);
lis3lv02d_add_fs(dev);

13
drivers/hwmon/lis3lv02d.h
View File

@ -20,6 +20,7 @@
*/
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <linux/regulator/consumer.h>
/*
* This driver tries to support the "digital" accelerometer chips from
@ -223,11 +224,17 @@ enum lis3lv02d_click_src_8b {
CLICK_IA = 0x40,
};
enum lis3lv02d_reg_state {
LIS3_REG_OFF = 0x00,
LIS3_REG_ON = 0x01,
};
union axis_conversion {
struct {
int x, y, z;
};
int as_array[3];
};
struct lis3lv02d {
@ -236,8 +243,13 @@ struct lis3lv02d {
int (*init) (struct lis3lv02d *lis3);
int (*write) (struct lis3lv02d *lis3, int reg, u8 val);
int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret);
int (*reg_ctrl) (struct lis3lv02d *lis3, bool state);
int *odrs; /* Supported output data rates */
u8 *regs; /* Regs to store / restore */
int regs_size;
u8 *reg_cache;
bool regs_stored;
u8 odr_mask; /* ODR bit mask */
u8 whoami; /* indicates measurement precision */
s16 (*read_data) (struct lis3lv02d *lis3, int reg);
@ -250,6 +262,7 @@ struct lis3lv02d {
struct input_polled_dev *idev; /* input device */
struct platform_device *pdev; /* platform device */
struct regulator_bulk_data regulators[2];
atomic_t count; /* interrupt count after last read */
union axis_conversion ac; /* hw -> logical axis */
int mapped_btns[3];

55
drivers/hwmon/lis3lv02d_i2c.c
View File

@ -30,10 +30,29 @@
#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;
@ -52,6 +71,13 @@ 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)
@ -72,6 +98,10 @@ 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->axis_x)
lis3lv02d_axis_map.x = pdata->axis_x;
@ -88,6 +118,16 @@ 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;
@ -98,21 +138,34 @@ static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
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);
fail:
return ret;
}
static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
{
struct lis3lv02d *lis3 = i2c_get_clientdata(client);
struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
if (pdata && pdata->release_resources)
pdata->release_resources();
lis3lv02d_joystick_disable();
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

2
include/linux/lis3lv02d.h
View File

@ -64,6 +64,8 @@ struct lis3lv02d_platform_data {
s8 axis_x;
s8 axis_y;
s8 axis_z;
#define LIS3_USE_REGULATOR_CTRL 0x01
u16 driver_features;
int (*setup_resources)(void);
int (*release_resources)(void);
/* Limits for selftest are specified in chip data sheet */