u-boot/drivers/power/pmic/pmic_max77686.c
Jaehoon Chung 505cf4750a power: change from meaningless value to error number
'-1' is absolutely meaningless value.
This patch changed from meaningless value to error number.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-01-11 19:40:14 +09:00

304 lines
5.5 KiB
C

/*
* Copyright (C) 2012 Samsung Electronics
* Rajeshwari Shinde <rajeshwari.s@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fdtdec.h>
#include <i2c.h>
#include <power/pmic.h>
#include <power/max77686_pmic.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
static const char max77686_buck_addr[] = {
0xff, 0x10, 0x12, 0x1c, 0x26, 0x30, 0x32, 0x34, 0x36, 0x38
};
static unsigned int max77686_ldo_volt2hex(int ldo, ulong uV)
{
unsigned int hex = 0;
switch (ldo) {
case 1:
case 2:
case 6:
case 7:
case 8:
case 15:
hex = (uV - 800000) / 25000;
break;
default:
hex = (uV - 800000) / 50000;
}
if (hex >= 0 && hex <= MAX77686_LDO_VOLT_MAX_HEX)
return hex;
debug("%s: %ld is wrong voltage value for LDO%d\n", __func__, uV, ldo);
return 0;
}
static int max77686_buck_volt2hex(int buck, ulong uV)
{
int hex = 0;
if (buck < 5 || buck > 9) {
debug("%s: buck %d is not supported\n", __func__, buck);
return -EINVAL;
}
hex = (uV - 750000) / 50000;
if (hex >= 0 && hex <= MAX77686_BUCK_VOLT_MAX_HEX)
return hex;
debug("%s: %ld is wrong voltage value for BUCK%d\n",
__func__, uV, buck);
return -EINVAL;
}
int max77686_set_ldo_voltage(struct pmic *p, int ldo, ulong uV)
{
unsigned int val, ret, hex, adr;
if (ldo < 1 || ldo > 26) {
printf("%s: %d is wrong ldo number\n", __func__, ldo);
return -EINVAL;
}
adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
hex = max77686_ldo_volt2hex(ldo, uV);
if (!hex)
return -EINVAL;
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_LDO_VOLT_MASK;
val |= hex;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int max77686_set_buck_voltage(struct pmic *p, int buck, ulong uV)
{
unsigned int val, adr;
int hex, ret;
if (buck < 5 || buck > 9) {
printf("%s: %d is an unsupported bucket number\n",
__func__, buck);
return -EINVAL;
}
adr = max77686_buck_addr[buck] + 1;
hex = max77686_buck_volt2hex(buck, uV);
if (hex < 0)
return hex;
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_BUCK_VOLT_MASK;
ret |= pmic_reg_write(p, adr, val | hex);
return ret;
}
int max77686_set_ldo_mode(struct pmic *p, int ldo, char opmode)
{
unsigned int val, ret, adr, mode;
if (ldo < 1 || 26 < ldo) {
printf("%s: %d is wrong ldo number\n", __func__, ldo);
return -EINVAL;
}
adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
/* mode */
switch (opmode) {
case OPMODE_OFF:
mode = MAX77686_LDO_MODE_OFF;
break;
case OPMODE_STANDBY:
switch (ldo) {
case 2:
case 6:
case 7:
case 8:
case 10:
case 11:
case 12:
case 14:
case 15:
case 16:
mode = MAX77686_LDO_MODE_STANDBY;
break;
default:
mode = 0xff;
}
break;
case OPMODE_LPM:
mode = MAX77686_LDO_MODE_LPM;
break;
case OPMODE_ON:
mode = MAX77686_LDO_MODE_ON;
break;
default:
mode = 0xff;
}
if (mode == 0xff) {
printf("%s: %d is not supported on LDO%d\n",
__func__, opmode, ldo);
return -ENOTSUPP;
}
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_LDO_MODE_MASK;
val |= mode;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int max77686_set_buck_mode(struct pmic *p, int buck, char opmode)
{
unsigned int val, ret, mask, adr, size, mode, mode_shift;
size = ARRAY_SIZE(max77686_buck_addr);
if (buck >= size) {
printf("%s: %d is wrong buck number\n", __func__, buck);
return -EINVAL;
}
adr = max77686_buck_addr[buck];
/* mask */
switch (buck) {
case 2:
case 3:
case 4:
mode_shift = MAX77686_BUCK_MODE_SHIFT_2;
break;
default:
mode_shift = MAX77686_BUCK_MODE_SHIFT_1;
}
mask = MAX77686_BUCK_MODE_MASK << mode_shift;
/* mode */
switch (opmode) {
case OPMODE_OFF:
mode = MAX77686_BUCK_MODE_OFF << mode_shift;
break;
case OPMODE_STANDBY:
switch (buck) {
case 1:
case 2:
case 3:
case 4:
mode = MAX77686_BUCK_MODE_STANDBY << mode_shift;
break;
default:
mode = 0xff;
}
break;
case OPMODE_LPM:
switch (buck) {
case 2:
case 3:
case 4:
mode = MAX77686_BUCK_MODE_LPM << mode_shift;
break;
default:
mode = 0xff;
}
break;
case OPMODE_ON:
mode = MAX77686_BUCK_MODE_ON << mode_shift;
break;
default:
mode = 0xff;
}
if (mode == 0xff) {
printf("%s: %d is not supported on BUCK%d\n",
__func__, opmode, buck);
return -ENOTSUPP;
}
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~mask;
val |= mode;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int pmic_init(unsigned char bus)
{
static const char name[] = "MAX77686_PMIC";
struct pmic *p = pmic_alloc();
#if CONFIG_IS_ENABLED(OF_CONTROL)
const void *blob = gd->fdt_blob;
int node, parent, tmp;
#endif
if (!p) {
printf("%s: POWER allocation error!\n", __func__);
return -ENOMEM;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
node = fdtdec_next_compatible(blob, 0, COMPAT_MAXIM_MAX77686_PMIC);
if (node < 0) {
debug("PMIC: No node for PMIC Chip in device tree\n");
debug("node = %d\n", node);
return -ENODEV;
}
parent = fdt_parent_offset(blob, node);
if (parent < 0) {
debug("%s: Cannot find node parent\n", __func__);
return -ENODEV;
}
/* tmp since p->bus is unsigned */
tmp = i2c_get_bus_num_fdt(parent);
if (tmp < 0) {
debug("%s: Cannot find I2C bus\n", __func__);
return -ENODEV;
}
p->bus = tmp;
p->hw.i2c.addr = fdtdec_get_int(blob, node, "reg", 9);
#else
p->bus = bus;
p->hw.i2c.addr = MAX77686_I2C_ADDR;
#endif
p->name = name;
p->interface = PMIC_I2C;
p->number_of_regs = MAX77686_NUM_OF_REGS;
p->hw.i2c.tx_num = 1;
puts("Board PMIC init\n");
return 0;
}