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/*
*
*Minimalistic MAX8893 PMIC driver for CMC732 WiMAX chipset
*
*Use retrys when bus is shared or problematic.
*
*Functions not exported are made static
*
*In this driver, BUCK is referred as LDO number "-1"
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/wimax/samsung/max8893.h>
/*#define WIMAX_DEBUG*/
static struct i2c_client *max8893_client;
static int max8893_set_ldo(int ldo, int enable)
{
int temp;
temp = i2c_smbus_read_byte_data(max8893_client, MAX8893_REG_ONOFF);
if (temp < 0)
return temp;
temp = enable ? (temp|ENABLE_LDO(ldo)) : (temp&DISABLE_LDO(ldo));
return i2c_smbus_write_byte_data(max8893_client,
MAX8893_REG_ONOFF, (unsigned char)temp);
}
#ifdef WIMAX_DEBUG
static int max8893_get_ldo(int ldo)
{
int temp;
temp = i2c_smbus_read_byte_data(max8893_client, MAX8893_REG_ONOFF);
if (temp < 0)
return temp;
return (temp&ENABLE_LDO(ldo)) ? 1 : 0;
}
static int max8893_get_voltage(int ldo)
{
int voltage;
voltage = i2c_smbus_read_byte_data(max8893_client,
MAX8893_REG_LDO(ldo));
return voltage ;
}
#endif
static int max8893_set_voltage(int ldo, int mv)
{
int temp;
if (mv > MAX_VOLTAGE(ldo))
return -22;
temp = MIN_VOLTAGE(ldo);
if (mv < temp)
return -22;
temp = (mv - temp)/100;
return i2c_smbus_write_byte_data(max8893_client,
MAX8893_REG_LDO(ldo), (unsigned char)temp);
}
int wimax_pmic_set_voltage(void)
{
int ret;
#ifdef WIMAX_DEBUG
int i;
#endif
mdelay(10);
ret = (
max8893_set_voltage(BUCK, 1200)|
max8893_set_voltage(LDO1, 2800)|
max8893_set_voltage(LDO2, 2800)|
max8893_set_voltage(LDO3, 3300)|
max8893_set_voltage(LDO4, 2900)|
max8893_set_voltage(LDO5, 2800)
);
if (ret)
printk(KERN_ERR "ERROR SETTING WIMAX PMIC POWER ret = %d\n",
ret);
#ifdef WIMAX_DEBUG
max8893_set_ldo(BUCK, ON);
max8893_set_ldo(LDO1, ON);
max8893_set_ldo(LDO2, ON);
max8893_set_ldo(LDO3, ON);
max8893_set_ldo(LDO4, ON);
max8893_set_ldo(LDO5, ON);
for (i = 1; i < 6; i++) {
printk(KERN_DEBUG "[WIMAX_DEBUG] LDO%d STATE :%d\n", i,
max8893_get_ldo(i));
printk(KERN_DEBUG "[WIMAX_DEBUG] LDO%d VOLTAGE:%x\n", i,
max8893_get_voltage(i));
}
#endif
return ret;
}
EXPORT_SYMBOL(wimax_pmic_set_voltage);
static int max8893_wmx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
#ifdef WIMAX_DEBUG
int i;
#endif
max8893_client = client;
return 0;
}
static int max8893_wmx_remove(struct i2c_client *client)
{
max8893_set_ldo(BUCK, OFF);
max8893_set_ldo(LDO1, OFF);
max8893_set_ldo(LDO2, OFF);
max8893_set_ldo(LDO3, OFF);
max8893_set_ldo(LDO4, OFF);
max8893_set_ldo(LDO5, OFF);
return 0;
}
const struct i2c_device_id max8893_wmx_id[] = {
{ "max8893_wmx", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8893_wmx_id);
static struct i2c_driver max8893_wmx_driver = {
.probe = max8893_wmx_probe,
.remove = max8893_wmx_remove,
.id_table = max8893_wmx_id,
.driver = {
.name = "max8893_wmx",
},
};
static int __init max8893_wmx_pmic_init(void)
{
return i2c_add_driver(&max8893_wmx_driver);
}
static void __exit max8893_wmx_pmic_exit(void)
{
i2c_del_driver(&max8893_wmx_driver);
}
subsys_initcall(max8893_wmx_pmic_init);
module_exit(max8893_wmx_pmic_exit);
MODULE_DESCRIPTION("MAXIM 8893 PMIC driver for WiMAX");
MODULE_AUTHOR("SAMSUNG ELECTRONICS");
MODULE_LICENSE("GPL");
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