1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/regulator/rc5t583-regulator.c b/drivers/regulator/rc5t583-regulator.c
new file mode 100644
index 000000000000..1d34e64a1307
--- /dev/null
+++ b/drivers/regulator/rc5t583-regulator.c
@@ -0,0 +1,255 @@
+/*
+ * Regulator driver for RICOH RC5T583 power management chip.
+ *
+ * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
+ * Author: Laxman dewangan <ldewangan@nvidia.com>
+ *
+ * based on code
+ *      Copyright (C) 2011 RICOH COMPANY,LTD
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+#include <linux/mfd/rc5t583.h>
+
+struct rc5t583_regulator_info {
+        int                     deepsleep_id;
+
+        /* Regulator register address.*/
+        uint8_t                 reg_disc_reg;
+        uint8_t                 disc_bit;
+        uint8_t                 deepsleep_reg;
+
+        /* Regulator specific turn-on delay  and voltage settling time*/
+        int                     enable_uv_per_us;
+        int                     change_uv_per_us;
+
+        /* Used by regulator core */
+        struct regulator_desc   desc;
+};
+
+struct rc5t583_regulator {
+        struct rc5t583_regulator_info *reg_info;
+
+        /* Devices */
+        struct device           *dev;
+        struct rc5t583          *mfd;
+        struct regulator_dev    *rdev;
+};
+
+static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
+{
+        struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+        int vsel = regulator_get_voltage_sel_regmap(rdev);
+        int curr_uV = regulator_list_voltage_linear(rdev, vsel);
+
+        return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
+}
+
+static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
+                unsigned int old_selector, unsigned int new_selector)
+{
+        struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+        int old_uV, new_uV;
+        old_uV = regulator_list_voltage_linear(rdev, old_selector);
+
+        if (old_uV < 0)
+                return old_uV;
+
+        new_uV = regulator_list_voltage_linear(rdev, new_selector);
+        if (new_uV < 0)
+                return new_uV;
+
+        return DIV_ROUND_UP(abs(old_uV - new_uV),
+                                reg->reg_info->change_uv_per_us);
+}
+
+
+static struct regulator_ops rc5t583_ops = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .enable_time            = rc5t583_regulator_enable_time,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+        .list_voltage           = regulator_list_voltage_linear,
+        .map_voltage            = regulator_map_voltage_linear,
+        .set_voltage_time_sel   = rc5t583_set_voltage_time_sel,
+};
+
+#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
+                _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
+{                                                               \
+        .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
+        .disc_bit       = _disc_bit,                            \
+        .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
+        .enable_uv_per_us = _enable_mv * 1000,                  \
+        .change_uv_per_us = 40 * 1000,                          \
+        .deepsleep_id   = RC5T583_DS_##_id,                     \
+        .desc = {                                               \
+                .name = "rc5t583-regulator-"#_id,               \
+                .id = RC5T583_REGULATOR_##_id,                  \
+                .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
+                .ops = &rc5t583_ops,                            \
+                .type = REGULATOR_VOLTAGE,                      \
+                .owner = THIS_MODULE,                           \
+                .vsel_reg = RC5T583_REG_##_id##DAC,             \
+                .vsel_mask = _vout_mask,                        \
+                .enable_reg = RC5T583_REG_##_en_reg,            \
+                .enable_mask = BIT(_en_bit),                    \
+                .min_uV = _min_mv * 1000,                       \
+                .uV_step = _step_uV,                            \
+        },                                                      \
+}
+
+static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
+        RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
+        RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
+        RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
+        RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
+        RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
+        RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
+        RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
+        RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
+        RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
+        RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
+        RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
+        RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
+        RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
+        RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
+};
+
+static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
+{
+        struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
+        struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
+        struct regulator_init_data *reg_data;
+        struct regulator_config config = { };
+        struct rc5t583_regulator *reg = NULL;
+        struct rc5t583_regulator *regs;
+        struct regulator_dev *rdev;
+        struct rc5t583_regulator_info *ri;
+        int ret;
+        int id;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "No platform data, exiting...\n");
+                return -ENODEV;
+        }
+
+        regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
+                        sizeof(struct rc5t583_regulator), GFP_KERNEL);
+        if (!regs) {
+                dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
+                return -ENOMEM;
+        }
+
+
+        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
+                reg_data = pdata->reg_init_data[id];
+
+                /* No need to register if there is no regulator data */
+                if (!reg_data)
+                        continue;
+
+                reg = &regs[id];
+                ri = &rc5t583_reg_info[id];
+                reg->reg_info = ri;
+                reg->mfd = rc5t583;
+                reg->dev = &pdev->dev;
+
+                if (ri->deepsleep_id == RC5T583_DS_NONE)
+                        goto skip_ext_pwr_config;
+
+                ret = rc5t583_ext_power_req_config(rc5t583->dev,
+                                ri->deepsleep_id,
+                                pdata->regulator_ext_pwr_control[id],
+                                pdata->regulator_deepsleep_slot[id]);
+                /*
+                 * Configuring external control is not a major issue,
+                 * just give warning.
+                 */
+                if (ret < 0)
+                        dev_warn(&pdev->dev,
+                                "Failed to configure ext control %d\n", id);
+
+skip_ext_pwr_config:
+                config.dev = &pdev->dev;
+                config.init_data = reg_data;
+                config.driver_data = reg;
+                config.regmap = rc5t583->regmap;
+
+                rdev = regulator_register(&ri->desc, &config);
+                if (IS_ERR(rdev)) {
+                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
+                                                ri->desc.name);
+                        ret = PTR_ERR(rdev);
+                        goto clean_exit;
+                }
+                reg->rdev = rdev;
+        }
+        platform_set_drvdata(pdev, regs);
+        return 0;
+
+clean_exit:
+        while (--id >= 0)
+                regulator_unregister(regs[id].rdev);
+
+        return ret;
+}
+
+static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
+{
+        struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
+        int id;
+
+        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
+                regulator_unregister(regs[id].rdev);
+        return 0;
+}
+
+static struct platform_driver rc5t583_regulator_driver = {
+        .driver = {
+                .name   = "rc5t583-regulator",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = rc5t583_regulator_probe,
+        .remove         = __devexit_p(rc5t583_regulator_remove),
+};
+
+static int __init rc5t583_regulator_init(void)
+{
+        return platform_driver_register(&rc5t583_regulator_driver);
+}
+subsys_initcall(rc5t583_regulator_init);
+
+static void __exit rc5t583_regulator_exit(void)
+{
+        platform_driver_unregister(&rc5t583_regulator_driver);
+}
+module_exit(rc5t583_regulator_exit);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("RC5T583 regulator driver");
+MODULE_ALIAS("platform:rc5t583-regulator");
+MODULE_LICENSE("GPL v2");