X-Power AXP288 PMIC Fuel Gauge Driver

New power_supply driver at driver/power which interfaces with the axp20x mfd driver as a cell. Provides battery info, monitors for changes, and generates alerts on temperature and capacity issues

Todd Brandt (3):
mfd/axp20x: change battery cell name to fuel gauge mfd/axp20x: add support for fuel gauge cell X-Power AXP288 PMIC Fuel Gauge Driver

v1: 01/07/14
v2: 01/22/14
- replaced the const in axp20x_acpi_match declaration
- reformatted the commit text
- added IIO as driver dependency
- moved debug info to debugfs in file fuelgauge
- added HEALTH_COLD value to health calculation
- added better cleanup to remove call
cancelling any delayed work calls unregistration of the power_supply
v3: 01/28/14
- moved debugs create and init config regs after error case
- freed the virqs in the remove function
- remove .owner field as it is populated automatically

 drivers/mfd/axp20x.c       |  8 ++++----
 drivers/power/Kconfig      |  9 +++++++++
 drivers/power/Makefile     |  1 +
 include/linux/mfd/axp20x.h | 43 +++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 55 insertions(+), 6 deletions(-)

2.1.0

Name changes to the battery cell structure to a more generic cell type: fuel gauge.

---
 drivers/mfd/axp20x.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

v1: 01/07/14
v2: 01/22/14
- replaced the const in axp20x_acpi_match declaration
v3: same as v2

index b1b580a..0acbe52 100644
@@ -87,7 +87,7 @@ static struct resource axp20x_pek_resources[] = {
 	},
 };
 
-static struct resource axp288_battery_resources[] = {
+static struct resource axp288_fuel_gauge_resources[] = {
 	{
 		.start = AXP288_IRQ_QWBTU,
 		.end   = AXP288_IRQ_QWBTU,

@@ -350,9 +350,9 @@ static struct mfd_cell axp288_cells[] = {
 		.resources = axp288_charger_resources,
 	},
 	{
-		.name = "axp288_battery",
-		.num_resources = ARRAY_SIZE(axp288_battery_resources),
-		.resources = axp288_battery_resources,
+		.name = "axp288_fuel_gauge",
+		.num_resources = ARRAY_SIZE(axp288_fuel_gauge_resources),
+		.resources = axp288_fuel_gauge_resources,
 	},
 	{
 		.name = "axp288_pmic_acpi",

2.1.0

Register definitions and platform data structure for fuel gauge cell devices.

---
 include/linux/mfd/axp20x.h | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

v3: same as v1-2 and is already accepted, re-included for continuity

index 81589d1..dfabd6d 100644
@@ -124,10 +124,27 @@ enum {
 #define AXP288_PMIC_ADC_H               0x56
 #define AXP288_PMIC_ADC_L               0x57
 #define AXP288_ADC_TS_PIN_CTRL          0x84
-
 #define AXP288_PMIC_ADC_EN              0x84
-#define AXP288_FG_TUNE5			0xed
 
+/* Fuel Gauge */
+#define AXP288_FG_RDC1_REG          0xba
+#define AXP288_FG_RDC0_REG          0xbb
+#define AXP288_FG_OCVH_REG          0xbc
+#define AXP288_FG_OCVL_REG          0xbd
+#define AXP288_FG_OCV_CURVE_REG     0xc0
+#define AXP288_FG_DES_CAP1_REG      0xe0
+#define AXP288_FG_DES_CAP0_REG      0xe1
+#define AXP288_FG_CC_MTR1_REG       0xe2
+#define AXP288_FG_CC_MTR0_REG       0xe3
+#define AXP288_FG_OCV_CAP_REG       0xe4
+#define AXP288_FG_CC_CAP_REG        0xe5
+#define AXP288_FG_LOW_CAP_REG       0xe6
+#define AXP288_FG_TUNE0             0xe8
+#define AXP288_FG_TUNE1             0xe9
+#define AXP288_FG_TUNE2             0xea
+#define AXP288_FG_TUNE3             0xeb
+#define AXP288_FG_TUNE4             0xec
+#define AXP288_FG_TUNE5             0xed
 
 /* Regulators IDs */
 enum {

@@ -236,4 +253,26 @@ struct axp20x_dev {
 	const struct regmap_irq_chip	*regmap_irq_chip;
 };
 
+#define BATTID_LEN				64
+#define OCV_CURVE_SIZE			32
+#define MAX_THERM_CURVE_SIZE	25
+#define PD_DEF_MIN_TEMP			0
+#define PD_DEF_MAX_TEMP			55
+
+struct axp20x_fg_pdata {
+	char battid[BATTID_LEN + 1];
+	int design_cap;
+	int min_volt;
+	int max_volt;
+	int max_temp;
+	int min_temp;
+	int cap1;
+	int cap0;
+	int rdc1;
+	int rdc0;
+	int ocv_curve[OCV_CURVE_SIZE];
+	int tcsz;
+	int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
+};
+
 #endif /* __LINUX_MFD_AXP20X_H */

2.1.0

New power_supply driver at driver/power which interfaces with the axp20x mfd driver as a cell. Provides battery info, monitors for changes, and generates alerts on temperature and capacity issues

---
 drivers/power/Kconfig             |    9 +
 drivers/power/Makefile            |    1 +
 drivers/power/axp288_fuel_gauge.c | 1151 +++++++++++++++++++++++++++++++++++++
 3 files changed, 1161 insertions(+)
 create mode 100644 drivers/power/axp288_fuel_gauge.c

v1: 01/07/14
v2: 01/22/14
- reformatted the commit text
- added IIO as driver dependency
- moved debug info to debugfs in file fuelgauge
- added HEALTH_COLD value to health calculation
- added better cleanup to remove call
cancelling any delayed work calls unregistration of the power_supply
v3: 01/28/14
- moved debugs create and init config regs after error case
- freed the virqs in the remove function
- remove .owner field as it is populated automatically

index 0108c2a..a1166e0 100644
@@ -192,6 +192,15 @@ config BATTERY_DA9052
 	  Say Y here to enable support for batteries charger integrated into
 	  DA9052 PMIC.
 
+config AXP288_FUEL_GAUGE
+	tristate "X-Powers AXP288 Fuel Gauge"
+	depends on MFD_AXP20X && IIO
+	help
+	  Say yes here to have support for X-Power power management IC (PMIC)
+	  Fuel Gauge. The device provides battery statistics and status
+	  monitoring as well as alerts for battery over/under voltage and
+	  over/under temperature.
+
 config BATTERY_MAX17040
 	tristate "Maxim MAX17040 Fuel Gauge"
 	depends on I2C

index dfa8942..eb76b23 100644
@@ -59,3 +59,4 @@ obj-$(CONFIG_POWER_AVS)		+= avs/
 obj-$(CONFIG_CHARGER_SMB347)	+= smb347-charger.o
 obj-$(CONFIG_CHARGER_TPS65090)	+= tps65090-charger.o
 obj-$(CONFIG_POWER_RESET)	+= reset/
+obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o

2.1.0