mfd: da9150: Add support for Fuel-Gauge

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Adam Thomson 2015-10-07 14:54:08 +01:00 committed by Lee Jones
parent 1f93e4a96c
commit 1ac710e08a
2 changed files with 167 additions and 8 deletions

View file

@ -23,6 +23,77 @@
#include <linux/mfd/da9150/core.h>
#include <linux/mfd/da9150/registers.h>
/* Raw device access, used for QIF */
static int da9150_i2c_read_device(struct i2c_client *client, u8 addr, int count,
u8 *buf)
{
struct i2c_msg xfer;
int ret;
/*
* Read is split into two transfers as device expects STOP/START rather
* than repeated start to carry out this kind of access.
*/
/* Write address */
xfer.addr = client->addr;
xfer.flags = 0;
xfer.len = 1;
xfer.buf = &addr;
ret = i2c_transfer(client->adapter, &xfer, 1);
if (ret != 1) {
if (ret < 0)
return ret;
else
return -EIO;
}
/* Read data */
xfer.addr = client->addr;
xfer.flags = I2C_M_RD;
xfer.len = count;
xfer.buf = buf;
ret = i2c_transfer(client->adapter, &xfer, 1);
if (ret == 1)
return 0;
else if (ret < 0)
return ret;
else
return -EIO;
}
static int da9150_i2c_write_device(struct i2c_client *client, u8 addr,
int count, const u8 *buf)
{
struct i2c_msg xfer;
u8 *reg_data;
int ret;
reg_data = kzalloc(1 + count, GFP_KERNEL);
if (!reg_data)
return -ENOMEM;
reg_data[0] = addr;
memcpy(&reg_data[1], buf, count);
/* Write address & data */
xfer.addr = client->addr;
xfer.flags = 0;
xfer.len = 1 + count;
xfer.buf = reg_data;
ret = i2c_transfer(client->adapter, &xfer, 1);
kfree(reg_data);
if (ret == 1)
return 0;
else if (ret < 0)
return ret;
else
return -EIO;
}
static bool da9150_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
@ -107,6 +178,28 @@ static const struct regmap_config da9150_regmap_config = {
.volatile_reg = da9150_volatile_reg,
};
void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf)
{
int ret;
ret = da9150_i2c_read_device(da9150->core_qif, addr, count, buf);
if (ret < 0)
dev_err(da9150->dev, "Failed to read from QIF 0x%x: %d\n",
addr, ret);
}
EXPORT_SYMBOL_GPL(da9150_read_qif);
void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf)
{
int ret;
ret = da9150_i2c_write_device(da9150->core_qif, addr, count, buf);
if (ret < 0)
dev_err(da9150->dev, "Failed to write to QIF 0x%x: %d\n",
addr, ret);
}
EXPORT_SYMBOL_GPL(da9150_write_qif);
u8 da9150_reg_read(struct da9150 *da9150, u16 reg)
{
int val, ret;
@ -297,19 +390,35 @@ static struct resource da9150_charger_resources[] = {
},
};
static struct resource da9150_fg_resources[] = {
DEFINE_RES_IRQ_NAMED(DA9150_IRQ_FG, "FG"),
};
enum da9150_dev_idx {
DA9150_GPADC_IDX = 0,
DA9150_CHARGER_IDX,
DA9150_FG_IDX,
};
static struct mfd_cell da9150_devs[] = {
{
[DA9150_GPADC_IDX] = {
.name = "da9150-gpadc",
.of_compatible = "dlg,da9150-gpadc",
.resources = da9150_gpadc_resources,
.num_resources = ARRAY_SIZE(da9150_gpadc_resources),
},
{
[DA9150_CHARGER_IDX] = {
.name = "da9150-charger",
.of_compatible = "dlg,da9150-charger",
.resources = da9150_charger_resources,
.num_resources = ARRAY_SIZE(da9150_charger_resources),
},
[DA9150_FG_IDX] = {
.name = "da9150-fuel-gauge",
.of_compatible = "dlg,da9150-fuel-gauge",
.resources = da9150_fg_resources,
.num_resources = ARRAY_SIZE(da9150_fg_resources),
},
};
static int da9150_probe(struct i2c_client *client,
@ -317,6 +426,7 @@ static int da9150_probe(struct i2c_client *client,
{
struct da9150 *da9150;
struct da9150_pdata *pdata = dev_get_platdata(&client->dev);
int qif_addr;
int ret;
da9150 = devm_kzalloc(&client->dev, sizeof(*da9150), GFP_KERNEL);
@ -335,16 +445,41 @@ static int da9150_probe(struct i2c_client *client,
return ret;
}
da9150->irq_base = pdata ? pdata->irq_base : -1;
/* Setup secondary I2C interface for QIF access */
qif_addr = da9150_reg_read(da9150, DA9150_CORE2WIRE_CTRL_A);
qif_addr = (qif_addr & DA9150_CORE_BASE_ADDR_MASK) >> 1;
qif_addr |= DA9150_QIF_I2C_ADDR_LSB;
da9150->core_qif = i2c_new_dummy(client->adapter, qif_addr);
if (!da9150->core_qif) {
dev_err(da9150->dev, "Failed to attach QIF client\n");
return -ENODEV;
}
i2c_set_clientdata(da9150->core_qif, da9150);
if (pdata) {
da9150->irq_base = pdata->irq_base;
da9150_devs[DA9150_FG_IDX].platform_data = pdata->fg_pdata;
da9150_devs[DA9150_FG_IDX].pdata_size =
sizeof(struct da9150_fg_pdata);
} else {
da9150->irq_base = -1;
}
ret = regmap_add_irq_chip(da9150->regmap, da9150->irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
da9150->irq_base, &da9150_regmap_irq_chip,
&da9150->regmap_irq_data);
if (ret)
return ret;
if (ret) {
dev_err(da9150->dev, "Failed to add regmap irq chip: %d\n",
ret);
goto regmap_irq_fail;
}
da9150->irq_base = regmap_irq_chip_get_base(da9150->regmap_irq_data);
enable_irq_wake(da9150->irq);
ret = mfd_add_devices(da9150->dev, -1, da9150_devs,
@ -352,11 +487,17 @@ static int da9150_probe(struct i2c_client *client,
da9150->irq_base, NULL);
if (ret) {
dev_err(da9150->dev, "Failed to add child devices: %d\n", ret);
regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
return ret;
goto mfd_fail;
}
return 0;
mfd_fail:
regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
regmap_irq_fail:
i2c_unregister_device(da9150->core_qif);
return ret;
}
static int da9150_remove(struct i2c_client *client)
@ -365,6 +506,7 @@ static int da9150_remove(struct i2c_client *client)
regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
mfd_remove_devices(da9150->dev);
i2c_unregister_device(da9150->core_qif);
return 0;
}

View file

@ -15,6 +15,7 @@
#define __DA9150_CORE_H
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
@ -46,23 +47,39 @@
#define DA9150_IRQ_GPADC 19
#define DA9150_IRQ_WKUP 20
/* I2C sub-device address */
#define DA9150_QIF_I2C_ADDR_LSB 0x5
struct da9150_fg_pdata {
u32 update_interval; /* msecs */
u8 warn_soc_lvl; /* % value */
u8 crit_soc_lvl; /* % value */
};
struct da9150_pdata {
int irq_base;
struct da9150_fg_pdata *fg_pdata;
};
struct da9150 {
struct device *dev;
struct regmap *regmap;
struct i2c_client *core_qif;
struct regmap_irq_chip_data *regmap_irq_data;
int irq;
int irq_base;
};
/* Device I/O */
/* Device I/O - Query Interface for FG and standard register access */
void da9150_read_qif(struct da9150 *da9150, u8 addr, int count, u8 *buf);
void da9150_write_qif(struct da9150 *da9150, u8 addr, int count, const u8 *buf);
u8 da9150_reg_read(struct da9150 *da9150, u16 reg);
void da9150_reg_write(struct da9150 *da9150, u16 reg, u8 val);
void da9150_set_bits(struct da9150 *da9150, u16 reg, u8 mask, u8 val);
void da9150_bulk_read(struct da9150 *da9150, u16 reg, int count, u8 *buf);
void da9150_bulk_write(struct da9150 *da9150, u16 reg, int count, const u8 *buf);
#endif /* __DA9150_CORE_H */