regulator: aat2870: Add AAT2870 regulator driver
Jin Park [Mon, 4 Jul 2011 08:43:42 +0000 (17:43 +0900)]
Add regulator driver for AnalogicTech AAT2870.

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/aat2870-regulator.c [new file with mode: 0644]

index 13722a7..c7fd2c0 100644 (file)
@@ -310,5 +310,12 @@ config REGULATOR_TPS65910
        help
          This driver supports TPS65910 voltage regulator chips.
 
+config REGULATOR_AAT2870
+       tristate "AnalogicTech AAT2870 Regulators"
+       depends on MFD_AAT2870_CORE
+       help
+         If you have a AnalogicTech AAT2870 say Y to enable the
+         regulator driver.
+
 endif
 
index 87ba2fd..040d5aa 100644 (file)
@@ -44,5 +44,6 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
 obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/aat2870-regulator.c b/drivers/regulator/aat2870-regulator.c
new file mode 100644 (file)
index 0000000..cd41045
--- /dev/null
@@ -0,0 +1,232 @@
+/*
+ * linux/drivers/regulator/aat2870-regulator.c
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ * Author: Jin Park <jinyoungp@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/aat2870.h>
+
+struct aat2870_regulator {
+       struct platform_device *pdev;
+       struct regulator_desc desc;
+
+       const int *voltages; /* uV */
+
+       int min_uV;
+       int max_uV;
+
+       u8 enable_addr;
+       u8 enable_shift;
+       u8 enable_mask;
+
+       u8 voltage_addr;
+       u8 voltage_shift;
+       u8 voltage_mask;
+};
+
+static int aat2870_ldo_list_voltage(struct regulator_dev *rdev,
+                                   unsigned selector)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+
+       return ri->voltages[selector];
+}
+
+static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
+                                      unsigned selector)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+       struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+
+       return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
+                       (selector << ri->voltage_shift) & ri->voltage_mask);
+}
+
+static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+       struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+       u8 val;
+       int ret;
+
+       ret = aat2870->read(aat2870, ri->voltage_addr, &val);
+       if (ret)
+               return ret;
+
+       return (val & ri->voltage_mask) >> ri->voltage_shift;
+}
+
+static int aat2870_ldo_enable(struct regulator_dev *rdev)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+       struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+
+       return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
+                              ri->enable_mask);
+}
+
+static int aat2870_ldo_disable(struct regulator_dev *rdev)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+       struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+
+       return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
+}
+
+static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
+{
+       struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+       struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+       u8 val;
+       int ret;
+
+       ret = aat2870->read(aat2870, ri->enable_addr, &val);
+       if (ret)
+               return ret;
+
+       return val & ri->enable_mask ? 1 : 0;
+}
+
+static struct regulator_ops aat2870_ldo_ops = {
+       .list_voltage = aat2870_ldo_list_voltage,
+       .set_voltage_sel = aat2870_ldo_set_voltage_sel,
+       .get_voltage_sel = aat2870_ldo_get_voltage_sel,
+       .enable = aat2870_ldo_enable,
+       .disable = aat2870_ldo_disable,
+       .is_enabled = aat2870_ldo_is_enabled,
+};
+
+static const int aat2870_ldo_voltages[] = {
+       1200000, 1300000, 1500000, 1600000,
+       1800000, 2000000, 2200000, 2500000,
+       2600000, 2700000, 2800000, 2900000,
+       3000000, 3100000, 3200000, 3300000,
+};
+
+#define AAT2870_LDO(ids)                               \
+       {                                               \
+               .desc = {                               \
+                       .name = #ids,                   \
+                       .id = AAT2870_ID_##ids,         \
+                       .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
+                       .ops = &aat2870_ldo_ops,        \
+                       .type = REGULATOR_VOLTAGE,      \
+                       .owner = THIS_MODULE,           \
+               },                                      \
+               .voltages = aat2870_ldo_voltages,       \
+               .min_uV = 1200000,                      \
+               .max_uV = 3300000,                      \
+       }
+
+static struct aat2870_regulator aat2870_regulators[] = {
+       AAT2870_LDO(LDOA),
+       AAT2870_LDO(LDOB),
+       AAT2870_LDO(LDOC),
+       AAT2870_LDO(LDOD),
+};
+
+static struct aat2870_regulator *aat2870_get_regulator(int id)
+{
+       struct aat2870_regulator *ri = NULL;
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
+               ri = &aat2870_regulators[i];
+               if (ri->desc.id == id)
+                       break;
+       }
+
+       if (!ri)
+               return NULL;
+
+       ri->enable_addr = AAT2870_LDO_EN;
+       ri->enable_shift = id - AAT2870_ID_LDOA;
+       ri->enable_mask = 0x1 << ri->enable_shift;
+
+       ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
+                          AAT2870_LDO_CD : AAT2870_LDO_AB;
+       ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
+       ri->voltage_mask = 0xF << ri->voltage_shift;
+
+       return ri;
+}
+
+static int aat2870_regulator_probe(struct platform_device *pdev)
+{
+       struct aat2870_regulator *ri;
+       struct regulator_dev *rdev;
+
+       ri = aat2870_get_regulator(pdev->id);
+       if (!ri) {
+               dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
+               return -EINVAL;
+       }
+       ri->pdev = pdev;
+
+       rdev = regulator_register(&ri->desc, &pdev->dev,
+                                 pdev->dev.platform_data, ri);
+       if (IS_ERR(rdev)) {
+               dev_err(&pdev->dev, "Failed to register regulator %s\n",
+                       ri->desc.name);
+               return PTR_ERR(rdev);
+       }
+       platform_set_drvdata(pdev, rdev);
+
+       return 0;
+}
+
+static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
+{
+       struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+       regulator_unregister(rdev);
+       return 0;
+}
+
+static struct platform_driver aat2870_regulator_driver = {
+       .driver = {
+               .name   = "aat2870-regulator",
+               .owner  = THIS_MODULE,
+       },
+       .probe  = aat2870_regulator_probe,
+       .remove = __devexit_p(aat2870_regulator_remove),
+};
+
+static int __init aat2870_regulator_init(void)
+{
+       return platform_driver_register(&aat2870_regulator_driver);
+}
+subsys_initcall(aat2870_regulator_init);
+
+static void __exit aat2870_regulator_exit(void)
+{
+       platform_driver_unregister(&aat2870_regulator_driver);
+}
+module_exit(aat2870_regulator_exit);
+
+MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");