regulator: aat2870: Add AAT2870 regulator driver

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>

1 files changed, 232 insertions, 0 deletions

diff --git a/drivers/regulator/aat2870-regulator.c b/drivers/regulator/aat2870-regulator.c
new file mode 100644
index 000000000000..cd4104542f0d
--- /dev/null
+++ b/drivers/regulator/aat2870-regulator.c
@@ -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>");