[PATCH v7 1/6] mfd: da9150: Add support for Fuel-Gauge

Adam Thomson
2015-10-07T13:54:18Z

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
---

Changes in v6:
- Rebase to v4.3-rc4

Changes in v5:
- Rebase to v4.2

Changes in v4:
- Update compatible string of fuel-gauge to "dlg, da9150-fuel-gauge". Also
made similar change to driver name to keep things consistent.

Changes in v3:
- Use DEFINE_RES_IRQ_NAMED() helper for defining FG IRQ resource.
- Unwanted new line & comments removed.
- Remove gotos which can be replaced with straight forward return calls.
- Add enum for indexing MFD cells list, which is used to assign pdata for FG
sub-device.
- Remove use of function pointers for QIF related read/write functions as
currently only I2C supported, so call I2C functions directly.
- Fold fg.h contents into core.h.

Changes in v2:
- Moved temp callback function prototype to be part of power fuel-gauge patch,
as requested by Lee Jones.

drivers/mfd/da9150-core.c | 156 ++++++++++++++++++++++++++++++++++++++--
include/linux/mfd/da9150/core.h | 19 ++++-
2 files changed, 167 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/da9150-core.c b/drivers/mfd/da9150-core.c
index 94b9bbd..85ca4b5 100644
--- a/drivers/mfd/da9150-core.c
+++ b/drivers/mfd/da9150-core.c
@@ -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;
}
diff --git a/include/linux/mfd/da9150/core.h b/include/linux/mfd/da9150/core.h
index 76e6689..1bf50ca 100644
--- a/include/linux/mfd/da9150/core.h
+++ b/include/linux/mfd/da9150/core.h
@@ -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 */
--
1.9.3