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pmic: tps65218: add useful functions and defines 

Add the following functions:
tps65218_reg_read() for accessing redisters
tps65218_toggle_fseal() for toggling the fseal bit
tps65218_lock_fsea() for locking the fseal bit to 1

Add the following defines:
All status register bits

Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Nikita Kiryanov 2016-02-19 19:19:46 +02:00 committed by Tom Rini
parent 5dc5a8cac7
commit 9bcfca123c
2 changed files with 68 additions and 0 deletions
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56
drivers/power/pmic/pmic_tps65218.c
View File

@ -11,6 +11,20 @@
#include <power/pmic.h>
#include <power/tps65218.h>
int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
{
uchar read_val;
int ret;
ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
if (ret)
return ret;
*dest_val = read_val;
return 0;
}
/**
* tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
* register or bit field regardless of protection
@ -98,6 +112,48 @@ int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
return 0;
}
/**
* tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
*
* @return: 0 on success, -EBADE if the sequence was broken
*/
int tps65218_toggle_fseal(void)
{
if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
0xb1, TPS65218_MASK_ALL_BITS))
return -EBADE;
if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
0xfe, TPS65218_MASK_ALL_BITS))
return -EBADE;
if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
0xa3, TPS65218_MASK_ALL_BITS))
return -EBADE;
return 0;
}
/**
* tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
*
* The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
* toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
* its value is locked and can only be reset by powering off the PMIC entirely.
*
* @return: 0 on success, -EBADE if the sequence was broken
*/
int tps65218_lock_fseal(void)
{
int i;
for (i = 0; i < 3; i++)
if (tps65218_toggle_fseal())
return -EBADE;
return 0;
}
int power_tps65218_init(unsigned char bus)
{
static const char name[] = "TPS65218_PMIC";

12
include/power/tps65218.h
View File

@ -8,6 +8,8 @@
#ifndef __POWER_TPS65218_H__
#define __POWER_TPS65218_H__
#include <linux/bitops.h>
/* I2C chip address */
#define TPS65218_CHIP_PM 0x24
@ -60,8 +62,18 @@ enum {
#define TPS65218_DCDC_VOLT_SEL_1260MV 0x29
#define TPS65218_DCDC_VOLT_SEL_1330MV 0x30
#define TPS65218_CC_STAT (BIT(0) | BIT(1))
#define TPS65218_STATE (BIT(2) | BIT(3))
#define TPS65218_PB_STATE BIT(4)
#define TPS65218_AC_STATE BIT(5)
#define TPS65218_EE BIT(6)
#define TPS65218_FSEAL BIT(7)
int tps65218_reg_read(uchar dest_reg, uchar *dest_val);
int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
uchar mask);
int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel);
int tps65218_toggle_fseal(void);
int tps65218_lock_fseal(void);
int power_tps65218_init(unsigned char bus);
#endif /* __POWER_TPS65218_H__ */