ad525x_dpot: add support for one time programmable pots

New parts supported:
	AD5170, AD5171, AD5172, AD5173, AD5273

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 116 insertions, 5 deletions

diff --git a/drivers/misc/ad525x_dpot.c b/drivers/misc/ad525x_dpot.c
index 255ba4b5e355..5e6fa8449e8b 100644
--- a/drivers/misc/ad525x_dpot.c
+++ b/drivers/misc/ad525x_dpot.c
@@ -47,6 +47,11 @@
  * AD5280		1		256		20, 50, 200
  * AD5282		2		256		20, 50, 200
  * ADN2860		3		512		25, 250
+ * AD5273		1		64		1, 10, 50, 100 (OTP)
+ * AD5171		1		64		5, 10, 50, 100 (OTP)
+ * AD5170		1		256		2.5, 10, 50, 100 (OTP)
+ * AD5172		2		256		2.5, 10, 50, 100 (OTP)
+ * AD5173		2		256		2.5, 10, 50, 100 (OTP)
  *
  * See Documentation/misc-devices/ad525x_dpot.txt for more info.
  *
@@ -84,7 +89,8 @@ struct dpot_data {
 	unsigned uid;
 	unsigned feat;
 	unsigned wipers;
-	u16 rdac_cache[8];
+	u16 rdac_cache[MAX_RDACS];
+	DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
 };
 
 static inline int dpot_read_d8(struct dpot_data *dpot)
@@ -162,6 +168,15 @@ static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
 		ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 			0 : DPOT_AD5291_RDAC_AB;
 		return dpot_read_r8d8(dpot, ctrl);
+	case DPOT_UID(AD5170_ID):
+	case DPOT_UID(AD5171_ID):
+	case DPOT_UID(AD5273_ID):
+			return dpot_read_d8(dpot);
+	case DPOT_UID(AD5172_ID):
+	case DPOT_UID(AD5173_ID):
+		ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+			0 : DPOT_AD5272_3_A0;
+		return dpot_read_r8d8(dpot, ctrl);
 	default:
 		if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
 			return dpot_read_r8d16(dpot, (reg & 0xF8) |
@@ -242,7 +257,7 @@ static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
 {
 	/* Only write the instruction byte for certain commands */
-	unsigned ctrl = 0;
+	unsigned tmp = 0, ctrl = 0;
 
 	switch (dpot->uid) {
 	case DPOT_UID(AD5246_ID):
@@ -261,6 +276,37 @@ static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
 			0 : DPOT_AD5291_RDAC_AB;
 		return dpot_write_r8d8(dpot, ctrl, value);
 		break;
+	case DPOT_UID(AD5171_ID):
+	case DPOT_UID(AD5273_ID):
+		if (reg & DPOT_ADDR_OTP) {
+			tmp = dpot_read_d8(dpot);
+			if (tmp >> 6) /* Ready to Program? */
+				return -EFAULT;
+			ctrl = DPOT_AD5273_FUSE;
+		}
+		return dpot_write_r8d8(dpot, ctrl, value);
+		break;
+	case DPOT_UID(AD5172_ID):
+	case DPOT_UID(AD5173_ID):
+		ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+			0 : DPOT_AD5272_3_A0;
+		if (reg & DPOT_ADDR_OTP) {
+			tmp = dpot_read_r8d16(dpot, ctrl);
+			if (tmp >> 14) /* Ready to Program? */
+				return -EFAULT;
+			ctrl |= DPOT_AD5270_2_3_FUSE;
+		}
+		return dpot_write_r8d8(dpot, ctrl, value);
+		break;
+	case DPOT_UID(AD5170_ID):
+		if (reg & DPOT_ADDR_OTP) {
+			tmp = dpot_read_r8d16(dpot, tmp);
+			if (tmp >> 14) /* Ready to Program? */
+				return -EFAULT;
+			ctrl = DPOT_AD5270_2_3_FUSE;
+		}
+		return dpot_write_r8d8(dpot, ctrl, value);
+		break;
 	default:
 		if (reg & DPOT_ADDR_CMD)
 			return dpot_write_d8(dpot, reg);
@@ -292,6 +338,12 @@ static ssize_t sysfs_show_reg(struct device *dev,
 	struct dpot_data *data = dev_get_drvdata(dev);
 	s32 value;
 
+	if (reg & DPOT_ADDR_OTP_EN)
+		return sprintf(buf, "%s\n",
+			test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
+			"enabled" : "disabled");
+
+
 	mutex_lock(&data->update_lock);
 	value = dpot_read(data, reg);
 	mutex_unlock(&data->update_lock);
@@ -320,6 +372,19 @@ static ssize_t sysfs_set_reg(struct device *dev,
 	unsigned long value;
 	int err;
 
+	if (reg & DPOT_ADDR_OTP_EN) {
+		if (!strncmp(buf, "enabled", sizeof("enabled")))
+			set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
+		else
+			clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
+
+		return count;
+	}
+
+	if ((reg & DPOT_ADDR_OTP) &&
+		!test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
+		return -EPERM;
+
 	err = strict_strtoul(buf, 10, &value);
 	if (err)
 		return err;
@@ -331,6 +396,8 @@ static ssize_t sysfs_set_reg(struct device *dev,
 	dpot_write(data, reg, value);
 	if (reg & DPOT_ADDR_EEPROM)
 		msleep(26);	/* Sleep while the EEPROM updates */
+	else if (reg & DPOT_ADDR_OTP)
+		msleep(400);	/* Sleep while the OTP updates */
 	mutex_unlock(&data->update_lock);
 
 	return count;
@@ -378,26 +445,38 @@ static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
+DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
+DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
 
 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
+DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
+DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
 
 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
+DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
+DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
 
 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
+DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
+DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
 
 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
+DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
+DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
 
 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
+DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
+DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
 
 static const struct attribute *dpot_attrib_wipers[] = {
 	&dev_attr_rdac0.attr,
@@ -419,6 +498,26 @@ static const struct attribute *dpot_attrib_eeprom[] = {
 	NULL
 };
 
+static const struct attribute *dpot_attrib_otp[] = {
+	&dev_attr_otp0.attr,
+	&dev_attr_otp1.attr,
+	&dev_attr_otp2.attr,
+	&dev_attr_otp3.attr,
+	&dev_attr_otp4.attr,
+	&dev_attr_otp5.attr,
+	NULL
+};
+
+static const struct attribute *dpot_attrib_otp_en[] = {
+	&dev_attr_otp0en.attr,
+	&dev_attr_otp1en.attr,
+	&dev_attr_otp2en.attr,
+	&dev_attr_otp3en.attr,
+	&dev_attr_otp4en.attr,
+	&dev_attr_otp5en.attr,
+	NULL
+};
+
 static const struct attribute *dpot_attrib_tolerance[] = {
 	&dev_attr_tolerance0.attr,
 	&dev_attr_tolerance1.attr,
@@ -468,6 +567,12 @@ __devinit int ad_dpot_add_files(struct device *dev,
 	if (features & F_CMD_TOL)
 		err |= sysfs_create_file(&dev->kobj,
 			dpot_attrib_tolerance[rdac]);
+	if (features & F_CMD_OTP) {
+		err |= sysfs_create_file(&dev->kobj,
+			dpot_attrib_otp_en[rdac]);
+		err |= sysfs_create_file(&dev->kobj,
+			dpot_attrib_otp[rdac]);
+	}
 
 	if (err)
 		dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
@@ -487,6 +592,12 @@ inline void ad_dpot_remove_files(struct device *dev,
 	if (features & F_CMD_TOL)
 		sysfs_remove_file(&dev->kobj,
 			dpot_attrib_tolerance[rdac]);
+	if (features & F_CMD_OTP) {
+		sysfs_remove_file(&dev->kobj,
+			dpot_attrib_otp_en[rdac]);
+		sysfs_remove_file(&dev->kobj,
+			dpot_attrib_otp[rdac]);
+	}
 }
 
 __devinit int ad_dpot_probe(struct device *dev,
@@ -514,7 +625,7 @@ __devinit int ad_dpot_probe(struct device *dev,
 	data->uid = DPOT_UID(data->devid);
 	data->wipers = DPOT_WIPERS(data->devid);
 
-	for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
+	for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 		if (data->wipers & (1 << i)) {
 			err = ad_dpot_add_files(dev, data->feat, i);
 			if (err)
@@ -538,7 +649,7 @@ __devinit int ad_dpot_probe(struct device *dev,
 	return 0;
 
 exit_remove_files:
-	for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
+	for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 		if (data->wipers & (1 << i))
 			ad_dpot_remove_files(dev, data->feat, i);
 
@@ -557,7 +668,7 @@ __devexit int ad_dpot_remove(struct device *dev)
 	struct dpot_data *data = dev_get_drvdata(dev);
 	int i;
 
-	for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
+	for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 		if (data->wipers & (1 << i))
 			ad_dpot_remove_files(dev, data->feat, i);