regulator: twl4030: add support for external voltage get/set

This is needed for SMPS regulators, which use the OMAP voltage
processor for voltage get/set functions instead of the normal I2C
channel. For this purpose, regulator_init_data->driver_data contents
are expanded, it is now a struct which contains function pointers
for the set/get voltage operations, a data pointer for these, and
the previously used features bitmask.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com> [for the MFD part]
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 34 insertions, 5 deletions

diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
index e5d222342157..7ff8bb22d569 100644
--- a/drivers/regulator/twl-regulator.c
+++ b/drivers/regulator/twl-regulator.c
@@ -58,6 +58,16 @@ struct twlreg_info {
 
 	/* chip specific features */
 	unsigned long 		features;
+
+	/*
+	 * optional override functions for voltage set/get
+	 * these are currently only used for SMPS regulators
+	 */
+	int			(*get_voltage)(void *data);
+	int			(*set_voltage)(void *data, int target_uV);
+
+	/* data passed from board for external get/set voltage */
+	void			*data;
 };
 
 
@@ -522,15 +532,25 @@ twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
 	struct twlreg_info *info = rdev_get_drvdata(rdev);
 	int vsel = DIV_ROUND_UP(min_uV - 600000, 12500);
 
-	twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030,
-		vsel);
+	if (info->set_voltage) {
+		return info->set_voltage(info->data, min_uV);
+	} else {
+		twlreg_write(info, TWL_MODULE_PM_RECEIVER,
+			VREG_VOLTAGE_SMPS_4030, vsel);
+	}
+
 	return 0;
 }
 
 static int twl4030smps_get_voltage(struct regulator_dev *rdev)
 {
 	struct twlreg_info *info = rdev_get_drvdata(rdev);
-	int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
+	int vsel;
+
+	if (info->get_voltage)
+		return info->get_voltage(info->data);
+
+	vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER,
 		VREG_VOLTAGE_SMPS_4030);
 
 	return vsel * 12500 + 600000;
@@ -1060,6 +1080,7 @@ static int __devinit twlreg_probe(struct platform_device *pdev)
 	struct regulator_init_data	*initdata;
 	struct regulation_constraints	*c;
 	struct regulator_dev		*rdev;
+	struct twl_regulator_driver_data	*drvdata;
 
 	for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) {
 		if (twl_regs[i].desc.id != pdev->id)
@@ -1074,8 +1095,16 @@ static int __devinit twlreg_probe(struct platform_device *pdev)
 	if (!initdata)
 		return -EINVAL;
 
-	/* copy the features into regulator data */
-	info->features = (unsigned long)initdata->driver_data;
+	drvdata = initdata->driver_data;
+
+	if (!drvdata)
+		return -EINVAL;
+
+	/* copy the driver data into regulator data */
+	info->features = drvdata->features;
+	info->data = drvdata->data;
+	info->set_voltage = drvdata->set_voltage;
+	info->get_voltage = drvdata->get_voltage;
 
 	/* Constrain board-specific capabilities according to what
 	 * this driver and the chip itself can actually do.