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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.1-4 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi Thomas, Thanks for looking into this! > From: Thomas Antoine >=20 > The Maxim max77759 fuel gauge has the same interface as the Maxim max1720= x > except for the non-volatile memory slave address which is not available. It is not fully compatible, and it also has a lot more registers. For example, the voltage now is not in register 0xda as this driver assumes= . With these changes, POWER_SUPPLY_PROP_VOLTAGE_NOW just reads as 0. 0xda doesn't exist in max77759 I haven't compared in depth yet, though. > No slave is available at address 0xb of the i2c bus, which is coherent > with the following driver from google: line 5836 disables non-volatile > memory for m5 gauge. >=20 > Link: > https://android.googlesource.com/kernel/google-modules/bms/+/1a68c36bef47= 4573cc8629cc1d121eb6a81ab68c/max1720x_battery.c >=20 > Add support for the max77759 by allowing to use the non-volatile > memory or not based on the chip. Value for RSense comes from the followin= g > stock devicetree: >=20 > Link: > https://android.googlesource.com/kernel/devices/google/gs101/+/33eca36d43= da6c2b6a546806eb3e7411bbe6d60d/dts/gs101-raviole-battery.dtsi >=20 > Signed-off-by: Thomas Antoine > --- > =C2=A0drivers/power/supply/max1720x_battery.c | 71 ++++++++++++++++++++++= +++++- > ----- > =C2=A01 file changed, 59 insertions(+), 12 deletions(-) >=20 > diff --git a/drivers/power/supply/max1720x_battery.c > b/drivers/power/supply/max1720x_battery.c > index > 33105419e2427bb37963bda9948b647c239f8faa..faf336938dd4306dd2ceeb0a84b90ca= 8 > 0ad41a9f 100644 > --- a/drivers/power/supply/max1720x_battery.c > +++ b/drivers/power/supply/max1720x_battery.c > @@ -13,6 +13,7 @@ > =C2=A0#include > =C2=A0#include > =C2=A0#include > +#include Please keep file names in alphabetical order. > =C2=A0 > =C2=A0#include > =C2=A0 > @@ -39,6 +40,7 @@ > =C2=A0#define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0) > =C2=A0#define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0) > =C2=A0#define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2)) > +#define MAX172XX_DEV_NAME_TYPE_MAX77759 0 > =C2=A0#define MAX172XX_QR_TABLE10 0x22 > =C2=A0#define MAX172XX_BATT 0xDA /* Battery voltage */ > =C2=A0#define MAX172XX_ATAVCAP 0xDF > @@ -46,6 +48,7 @@ > =C2=A0static const char *const max1720x_manufacturer =3D "Maxim Integrate= d"; > =C2=A0static const char *const max17201_model =3D "MAX17201"; > =C2=A0static const char *const max17205_model =3D "MAX17205"; > +static const char *const max77759_model =3D "MAX77759"; > =C2=A0 > =C2=A0struct max1720x_device_info { > =C2=A0 struct regmap *regmap; > @@ -54,6 +57,21 @@ struct max1720x_device_info { > =C2=A0 int rsense; > =C2=A0}; > =C2=A0 > +struct chip_data { > + u16 default_nrsense; /* in regs in 10^-5 */ > + u8 has_nvmem; > +}; > + > +static const struct chip_data max1720x_data=C2=A0 =3D { > + .default_nrsense =3D 1000, > + .has_nvmem =3D 1, > +}; > + > +static const struct chip_data max77759_data =3D { > + .default_nrsense =3D 500, > + .has_nvmem =3D 0, > +}; This should be made a required devicetree property instead, at least for max77759, as it's completely board dependent, 'shunt-resistor-micro-ohms' is widely used. I also don't think there should be a default. The driver should just fail to probe if not specified in DT (for max77759). > + > =C2=A0/* > =C2=A0 * Model Gauge M5 Algorithm output register > =C2=A0 * Volatile data (must not be cached) > @@ -369,6 +387,8 @@ static int max1720x_battery_get_property(struct > power_supply *psy, > =C2=A0 val->strval =3D max17201_model; > =C2=A0 else if (reg_val =3D=3D MAX172XX_DEV_NAME_TYPE_MAX17205) > =C2=A0 val->strval =3D max17205_model; > + else if (reg_val =3D=3D MAX172XX_DEV_NAME_TYPE_MAX77759) > + val->strval =3D max77759_model; > =C2=A0 else This is a 16 bit register, and while yes, MAX172XX_DEV_NAME_TYPE_MASK only cares about the bottom 4 bits, the register is described as 'Firmware Version Information'. But maybe it's ok to do it like that, at least for now. > =C2=A0 return -ENODEV; > =C2=A0 break; > @@ -416,7 +436,6 @@ static int max1720x_probe_nvmem(struct i2c_client > *client, > =C2=A0 .priv =3D info, > =C2=A0 }; > =C2=A0 struct nvmem_device *nvmem; > - unsigned int val; > =C2=A0 int ret; > =C2=A0 > =C2=A0 info->ancillary =3D i2c_new_ancillary_device(client, "nvmem", 0xb)= ; > @@ -438,6 +457,27 @@ static int max1720x_probe_nvmem(struct i2c_client > *client, > =C2=A0 return PTR_ERR(info->regmap_nv); > =C2=A0 } > =C2=A0 > + nvmem =3D devm_nvmem_register(dev, &nvmem_config); > + if (IS_ERR(nvmem)) { > + dev_err(dev, "Could not register nvmem!"); > + return PTR_ERR(nvmem); > + } > + > + return 0; > +} > + > +static int max1720x_get_rsense(struct device *dev, > + struct max1720x_device_info > *info, > + const struct chip_data *data) > +{ > + unsigned int val; > + int ret; > + > + if (!data->has_nvmem) { > + info->rsense =3D data->default_nrsense; > + return 0; > + } > + > =C2=A0 ret =3D regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val); > =C2=A0 if (ret < 0) { > =C2=A0 dev_err(dev, "Failed to read sense resistor value\n"); > @@ -446,14 +486,9 @@ static int max1720x_probe_nvmem(struct i2c_client > *client, > =C2=A0 > =C2=A0 info->rsense =3D val; > =C2=A0 if (!info->rsense) { > - dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n"); > - info->rsense =3D 1000; /* in regs in 10^-5 */ > - } > - > - nvmem =3D devm_nvmem_register(dev, &nvmem_config); > - if (IS_ERR(nvmem)) { > - dev_err(dev, "Could not register nvmem!"); > - return PTR_ERR(nvmem); > + dev_warn(dev, "RSense not calibrated, set %d mOhms!\n", > + data- > >default_nrsense/100); > + info->rsense =3D data->default_nrsense; > =C2=A0 } > =C2=A0 > =C2=A0 return 0; > @@ -474,6 +509,7 @@ static int max1720x_probe(struct i2c_client *client) > =C2=A0 struct device *dev =3D &client->dev; > =C2=A0 struct max1720x_device_info *info; > =C2=A0 struct power_supply *bat; > + const struct chip_data *data; > =C2=A0 int ret; > =C2=A0 > =C2=A0 info =3D devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); > @@ -488,9 +524,19 @@ static int max1720x_probe(struct i2c_client *client) > =C2=A0 return dev_err_probe(dev, PTR_ERR(info->regmap), > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 "regmap initialization failed\n"); > =C2=A0 > - ret =3D max1720x_probe_nvmem(client, info); > + data =3D device_get_match_data(dev); > + if (!data) > + return dev_err_probe(dev, ret, "Failed to get chip > data\n"); > + > + if (data->has_nvmem) { > + ret =3D max1720x_probe_nvmem(client, info); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to probe > nvmem\n"); > + } > + > + ret =3D max1720x_get_rsense(dev, info, data); > =C2=A0 if (ret) > - return dev_err_probe(dev, ret, "Failed to probe > nvmem\n"); > + return dev_err_probe(dev, ret, "Failed to get RSense"); > =C2=A0 > =C2=A0 bat =3D devm_power_supply_register(dev, &max1720x_bat_desc, > &psy_cfg); > =C2=A0 if (IS_ERR(bat)) > @@ -501,7 +547,8 @@ static int max1720x_probe(struct i2c_client *client) > =C2=A0} > =C2=A0 > =C2=A0static const struct of_device_id max1720x_of_match[] =3D { > - { .compatible =3D "maxim,max17201" }, > + { .compatible =3D "maxim,max17201", .data =3D (void *) &max1720x_data > }, > + { .compatible =3D "maxim,max77759-fg", .data =3D (void *) > &max77759_data}, missing space before } Cheers, Andre' > =C2=A0 {} > =C2=A0}; > =C2=A0MODULE_DEVICE_TABLE(of, max1720x_of_match); >=20