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Date: Fri, 15 May 2009 11:16:19 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.arm.linux.org.uk"
<linux-arm-kernel@...ts.arm.linux.org.uk>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: 'Liam Girdwood' <lrg@...mlogic.co.uk>,
"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH] LP3971 PMIC regulator driver update
This patch fixes issues reported by Mark Brown in his review of National Semiconductors LP3971
PMIC regulator driver. It contains:
- a little code cleanup
- list_voltage() callback added
Reviewed-by: Kyungmin Park <kyungmin.park@...sung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
index 95c18bd..7f024b2 100644
--- a/drivers/regulator/lp3971.c
+++ b/drivers/regulator/lp3971.c
@@ -32,6 +32,11 @@ static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
#define LP3971_SYS_CONTROL1_REG 0x07
+/* System control register 1 initial value,
+ bits 4 and 5 are EPROM programmable */
+#define SYS_CONTROL1_INIT_VAL 0x40
+#define SYS_CONTROL1_INIT_MASK 0xCF
+
#define LP3971_BUCK_VOL_ENABLE_REG 0x10
#define LP3971_BUCK_VOL_CHANGE_REG 0x20
@@ -91,7 +96,7 @@ const static int buck_voltage_map[] = {
#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
#define LDO_VOL_CONTR_MASK 0x0f
-const static int ldo45_voltage_map1[] = {
+const static int ldo45_voltage_map[] = {
1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
};
@@ -105,8 +110,8 @@ const static int *ldo_voltage_map[] = {
ldo123_voltage_map, /* LDO1 */
ldo123_voltage_map, /* LDO2 */
ldo123_voltage_map, /* LDO3 */
- ldo45_voltage_map1, /* LDO4 */
- ldo45_voltage_map1, /* LDO5 */
+ ldo45_voltage_map, /* LDO4 */
+ ldo45_voltage_map, /* LDO5 */
};
#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
@@ -114,6 +119,12 @@ const static int *ldo_voltage_map[] = {
#define LDO_VOL_MIN_IDX 0x00
#define LDO_VOL_MAX_IDX 0x0f
+static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+ int ldo = rdev_get_id(dev) - LP3971_LDO1;
+ return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
+}
+
static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
@@ -180,6 +191,7 @@ static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
}
static struct regulator_ops lp3971_ldo_ops = {
+ .list_voltage = lp3971_ldo_list_voltage,
.is_enabled = lp3971_ldo_is_enabled,
.enable = lp3971_ldo_enable,
.disable = lp3971_ldo_disable,
@@ -187,6 +199,11 @@ static struct regulator_ops lp3971_ldo_ops = {
.set_voltage = lp3971_ldo_set_voltage,
};
+static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
+{
+ return 1000 * buck_voltage_map[index];
+}
+
static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
@@ -228,8 +245,10 @@ static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
if (reg <= BUCK_TARGET_VOL_MAX_IDX)
val = 1000 * buck_voltage_map[reg];
- else
+ else {
val = 0;
+ dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
+ }
return val;
}
@@ -273,6 +292,7 @@ static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
}
static struct regulator_ops lp3971_dcdc_ops = {
+ .list_voltage = lp3971_dcdc_list_voltage,
.is_enabled = lp3971_dcdc_is_enabled,
.enable = lp3971_dcdc_enable,
.disable = lp3971_dcdc_disable,
@@ -285,6 +305,7 @@ static struct regulator_desc regulators[] = {
.name = "LDO1",
.id = LP3971_LDO1,
.ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -292,6 +313,7 @@ static struct regulator_desc regulators[] = {
.name = "LDO2",
.id = LP3971_LDO2,
.ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -299,6 +321,7 @@ static struct regulator_desc regulators[] = {
.name = "LDO3",
.id = LP3971_LDO3,
.ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -306,6 +329,7 @@ static struct regulator_desc regulators[] = {
.name = "LDO4",
.id = LP3971_LDO4,
.ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -313,6 +337,7 @@ static struct regulator_desc regulators[] = {
.name = "LDO5",
.id = LP3971_LDO5,
.ops = &lp3971_ldo_ops,
+ .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -320,6 +345,7 @@ static struct regulator_desc regulators[] = {
.name = "DCDC1",
.id = LP3971_DCDC1,
.ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -327,6 +353,7 @@ static struct regulator_desc regulators[] = {
.name = "DCDC2",
.id = LP3971_DCDC2,
.ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -334,6 +361,7 @@ static struct regulator_desc regulators[] = {
.name = "DCDC3",
.id = LP3971_DCDC3,
.ops = &lp3971_dcdc_ops,
+ .n_voltages = ARRAY_SIZE(buck_voltage_map),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
@@ -456,8 +484,10 @@ static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
mutex_init(&lp3971->io_lock);
- /* Detect LP3971 (initial system control 1 reg is '0x60') */
+ /* Detect LP3971 */
ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
+ if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
+ ret = -ENODEV;
if (ret < 0) {
dev_err(&i2c->dev, "failed to detect device\n");
goto err_detect;
--
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