[PATCH v2 1/2] regulator: add support for regulators on the ab8500 MFD

Sundar Iyer
2010-07-13T14:09:32Z

From: Sundar R Iyer <sundar.iyer@stericsson.com>

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Bengt JONSSON <bengt.g.jonsson@stericsson.com>
Signed-off-by: Sundar R Iyer <sundar.iyer@stericsson.com>
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/ab8500.c | 425 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 434 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/ab8500.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 7cd8a29..6c14afd 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -221,5 +221,13 @@ config REGULATOR_AD5398
help
This driver supports AD5398 and AD5821 current regulator chips.
If building into module, its name is ad5398.ko.
+
+config REGULATOR_AB8500
+ bool "ST-Ericsson AB8500 Power Regulators"
+ depends on AB8500_CORE
+ help
+ This driver supports the regulators found on the ST-Ericsson mixed
+ signal AB8500 PMIC
+
endif

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 74a4638..fc696c5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -34,5 +34,6 @@ obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
+obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o

ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
new file mode 100644
index 0000000..29188e6
--- /dev/null
+++ b/drivers/regulator/ab8500.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
+ *
+ * AB8500 peripheral regulators
+ *
+ * AB8500 supports the following regulators,
+ * LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT,
+ * VAUX1/2/3, VANA
+ *
+ * for DB8500 cut 1.0 and previous versions of the silicon, all accesses
+ * to registers are through the DB8500 SPI. In cut 1.1 onwards, these
+ * accesses are through the DB8500 PRCMU I2C
+ *
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/ab8500.h>
+
+/**
+ * struct ab8500_regulator_info - ab8500 regulator information
+ * @desc: regulator description
+ * @ab8500: ab8500 parent
+ * @regulator_dev: regulator device
+ * @max_uV: maximum voltage (for variable voltage supplies)
+ * @min_uV: minimum voltage (for variable voltage supplies)
+ * @fixed_uV: typical voltage (for fixed voltage supplies)
+ * @update_reg: register to control on/off
+ * @mask: mask to enable/disable regulator
+ * @enable: bits to enable the regulator in normal(high power) mode
+ * @voltage_reg: register to control regulator voltage
+ * @voltage_mask: mask to control regulator voltage
+ * @supported_voltages: supported voltage table
+ * @voltages_len: number of supported voltages for the regulator
+ */
+struct ab8500_regulator_info {
+ struct regulator_desc desc;
+ struct ab8500 *ab8500;
+ struct regulator_dev *regulator;
+ int max_uV;
+ int min_uV;
+ int fixed_uV;
+ int update_reg;
+ int mask;
+ int enable;
+ int voltage_reg;
+ int voltage_mask;
+ int const *supported_voltages;
+ int voltages_len;
+};
+
+/* voltage tables for the vauxn/vintcore supplies */
+static const int ldo_vauxn_voltages[] = {
+ 1100000,
+ 1200000,
+ 1300000,
+ 1400000,
+ 1500000,
+ 1800000,
+ 1850000,
+ 1900000,
+ 2500000,
+ 2650000,
+ 2700000,
+ 2750000,
+ 2800000,
+ 2900000,
+ 3000000,
+ 3300000,
+};
+
+static const int ldo_vintcore_voltages[] = {
+ 1200000,
+ 1225000,
+ 1250000,
+ 1275000,
+ 1300000,
+ 1325000,
+ 1350000,
+};
+
+static int ab8500_regulator_enable(struct regulator_dev *rdev)
+{
+ int regulator_id, ret;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ ret = ab8500_set_bits(info->ab8500, info->update_reg,
+ info->mask, info->enable);
+ if (ret < 0)
+ dev_dbg(rdev_get_dev(rdev),
+ "couldnt set enable bits for regulator\n");
+ return ret;
+}
+
+static int ab8500_regulator_disable(struct regulator_dev *rdev)
+{
+ int regulator_id, ret;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ ret = ab8500_set_bits(info->ab8500, info->update_reg,
+ info->mask, 0x0);
+ if (ret < 0)
+ dev_dbg(rdev_get_dev(rdev),
+ "couldnt set disable bits for regulator\n");
+ return ret;
+}
+
+static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ int regulator_id, ret;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ ret = ab8500_read(info->ab8500, info->update_reg);
+ if (ret < 0) {
+ dev_dbg(rdev_get_dev(rdev),
+ "couldnt read 0x%x register\n", info->update_reg);
+ return ret;
+ }
+
+ if (ret & info->mask)
+ return true;
+ else
+ return false;
+}
+
+static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+ int regulator_id;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ /* return the uV for the fixed regulators */
+ if (info->fixed_uV)
+ return info->fixed_uV;
+
+ if (selector > info->voltages_len)
+ return -EINVAL;
+
+ return info->supported_voltages[selector];
+}
+
+static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
+{
+ int regulator_id, ret, val;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ ret = ab8500_read(info->ab8500, info->voltage_reg);
+ if (ret < 0) {
+ dev_dbg(rdev_get_dev(rdev),
+ "couldnt read voltage reg for regulator\n");
+ return ret;
+ }
+
+ /* vintcore has a different layout */
+ val = ret & info->voltage_mask;
+ if (regulator_id == AB8500_LDO_INTCORE)
+ ret = info->supported_voltages[val >> 0x3];
+ else
+ ret = info->supported_voltages[val];
+
+ return ret;
+}
+
+static int ab8500_get_best_voltage_index(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+ int i;
+
+ /* check the supported voltage */
+ for (i = 0; i < info->voltages_len; i++) {
+ if ((info->supported_voltages[i] >= min_uV) &&
+ (info->supported_voltages[i] <= max_uV))
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ int regulator_id, ret;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ /* get the appropriate voltages within the range */
+ ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV);
+ if (ret < 0) {
+ dev_dbg(rdev_get_dev(rdev),
+ "coudlnt get best voltage for regulator\n");
+ return ret;
+ }
+
+ /* set the registers for the request */
+ ret = ab8500_set_bits(info->ab8500, info->voltage_reg,
+ info->voltage_mask, ret);
+ if (ret < 0)
+ dev_dbg(rdev_get_dev(rdev),
+ "couldnt set voltage reg for regulator\n");
+
+ return ret;
+}
+
+static struct regulator_ops ab8500_regulator_ops = {
+ .enable = ab8500_regulator_enable,
+ .disable = ab8500_regulator_disable,
+ .is_enabled = ab8500_regulator_is_enabled,
+ .get_voltage = ab8500_regulator_get_voltage,
+ .set_voltage = ab8500_regulator_set_voltage,
+ .list_voltage = ab8500_list_voltage,
+};
+
+static int ab8500_fixed_get_voltage(struct regulator_dev *rdev)
+{
+ int regulator_id;
+ struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
+
+ regulator_id = rdev_get_id(rdev);
+ if (regulator_id >= AB8500_NUM_REGULATORS)
+ return -EINVAL;
+
+ return info->fixed_uV;
+}
+
+static struct regulator_ops ab8500_ldo_fixed_ops = {
+ .enable = ab8500_regulator_enable,
+ .disable = ab8500_regulator_disable,
+ .is_enabled = ab8500_regulator_is_enabled,
+ .get_voltage = ab8500_fixed_get_voltage,
+ .list_voltage = ab8500_list_voltage,
+};
+
+#define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable, \
+ volt_reg, volt_mask, voltages, \
+ len_volts) \
+{ \
+ .desc = { \
+ .name = "LDO-" #_id, \
+ .ops = &ab8500_regulator_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AB8500_LDO_##_id, \
+ .owner = THIS_MODULE, \
+ }, \
+ .min_uV = (min) * 1000, \
+ .max_uV = (max) * 1000, \
+ .update_reg = reg, \
+ .mask = reg_mask, \
+ .enable = reg_enable, \
+ .voltage_reg = volt_reg, \
+ .voltage_mask = volt_mask, \
+ .supported_voltages = voltages, \
+ .voltages_len = len_volts, \
+ .fixed_uV = 0, \
+}
+
+#define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask, \
+ reg_enable) \
+{ \
+ .desc = { \
+ .name = "LDO-" #_id, \
+ .ops = &ab8500_ldo_fixed_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AB8500_LDO_##_id, \
+ .owner = THIS_MODULE, \
+ }, \
+ .fixed_uV = fixed * 1000, \
+ .update_reg = reg, \
+ .mask = reg_mask, \
+ .enable = reg_enable, \
+}
+
+static struct ab8500_regulator_info ab8500_regulator_info[] = {
+ /*
+ * Variable Voltage LDOs
+ * name, min uV, max uV, ctrl reg, reg mask, enable mask,
+ * volt ctrl reg, volt ctrl mask, volt table, num supported volts
+ */
+ AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf,
+ ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
+ AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf,
+ ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
+ AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf,
+ ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
+ AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38,
+ ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)),
+
+ /*
+ * Fixed Voltage LDOs
+ * name, o/p uV, ctrl reg, enable, disable
+ */
+ AB8500_FIXED_LDO(TVOUT, 2000, 0x0380, 0x2, 0x2),
+ AB8500_FIXED_LDO(AUDIO, 2000, 0x0383, 0x2, 0x2),
+ AB8500_FIXED_LDO(ANAMIC1, 2050, 0x0383, 0x4, 0x4),
+ AB8500_FIXED_LDO(ANAMIC2, 2050, 0x0383, 0x8, 0x8),
+ AB8500_FIXED_LDO(DMIC, 1800, 0x0383, 0x10, 0x10),
+ AB8500_FIXED_LDO(ANA, 1200, 0x0383, 0xc, 0x4),
+};
+
+static inline struct ab8500_regulator_info *find_regulator_info(int id)
+{
+ struct ab8500_regulator_info *info;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
+ info = &ab8500_regulator_info[i];
+ if (info->desc.id == id)
+ return info;
+ }
+ return NULL;
+}
+
+static __devinit int ab8500_regulator_probe(struct platform_device *pdev)
+{
+ struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *pdata = dev_get_platdata(ab8500->dev);
+ int i, err;
+
+ if (!ab8500) {
+ dev_err(&pdev->dev, "null mfd parent\n");
+ return -EINVAL;
+ }
+
+ /* register all regulators */
+ for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
+ struct ab8500_regulator_info *info = NULL;
+
+ /* assign per-regulator data */
+ info = &ab8500_regulator_info[i];
+ info->ab8500 = ab8500;
+
+ info->regulator = regulator_register(&info->desc, &pdev->dev,
+ pdata->regulator[i], info);
+ if (IS_ERR(info->regulator)) {
+ err = PTR_ERR(info->regulator);
+ dev_err(&pdev->dev, "failed to register regulator %s\n",
+ info->desc.name);
+ /* when we fail, un-register all earlier regulators */
+ i--;
+ while (i > 0) {
+ info = &ab8500_regulator_info[i];
+ regulator_unregister(info->regulator);
+ i--;
+ }
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static __devexit int ab8500_regulator_remove(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
+ struct ab8500_regulator_info *info = NULL;
+ info = &ab8500_regulator_info[i];
+ regulator_unregister(info->regulator);
+ }
+
+ return 0;
+}
+
+static struct platform_driver ab8500_regulator_driver = {
+ .probe = ab8500_regulator_probe,
+ .remove = __devexit_p(ab8500_regulator_remove),
+ .driver = {
+ .name = "ab8500-regulator",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ab8500_regulator_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&ab8500_regulator_driver);
+ if (ret != 0)
+ pr_err("Failed to register ab8500 regulator: %d\n", ret);
+
+ return ret;
+}
+subsys_initcall(ab8500_regulator_init);
+
+static void __exit ab8500_regulator_exit(void)
+{
+ platform_driver_unregister(&ab8500_regulator_driver);
+}
+module_exit(ab8500_regulator_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
+MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC");
+MODULE_ALIAS("platform:ab8500-regulator");
--
1.7.0