Added missing tegra files.HEADmaster

1 files changed, 412 insertions, 0 deletions

diff --git a/drivers/regulator/gpio-switch-regulator.c b/drivers/regulator/gpio-switch-regulator.c
new file mode 100644
index 00000000000..55dd63675a0
--- /dev/null
+++ b/drivers/regulator/gpio-switch-regulator.c
@@ -0,0 +1,412 @@
+/*
+ * driver/regulator/gpio-switch-regulator.c
+ * GPIO based switch regulator to enable/disable power rails.
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+/*#define DEBUG                 1*/
+/*#define VERBOSE_DEBUG         1*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+#include <linux/regulator/gpio-switch-regulator.h>
+
+struct gpio_switch_regulator {
+        struct regulator_desc           reg_desc;
+        struct regulator_init_data      reg_init_data;
+        struct regulator                *input_regulator;
+        struct regulator_dev            *rdev;
+        struct device                   *dev;
+        int                             gpio_nr;
+        int                             pin_group;
+        bool                            is_gpio_init;
+        bool                            is_enable;
+        bool                            active_low;
+        bool                            is_init_success;
+        int                             *voltages;
+        unsigned                        curr_vol_sel;
+        struct gpio_switch_regulator_subdev_data *psubdev_data;
+        int (*enable_rail)(struct gpio_switch_regulator_subdev_data *sdata);
+        int (*disable_rail)(struct gpio_switch_regulator_subdev_data *sdata);
+};
+
+static int _gpio_regulator_enable(struct device *dev,
+                struct gpio_switch_regulator *ri)
+{
+        int init_val;
+        int ret;
+
+        if (ri->enable_rail) {
+                ret = ri->enable_rail(ri->psubdev_data);
+                if (ret < 0)
+                        dev_err(dev, "Unable to enable rail through board api"
+                        " error %d\n", ret);
+        } else {
+                init_val = (ri->active_low) ? 0 : 1;
+                ret = gpio_direction_output(ri->gpio_nr, init_val);
+                if (ret < 0)
+                        dev_err(dev, "Unable to set direction %d\n",
+                                ri->gpio_nr);
+        }
+        return ret;
+}
+
+static int _gpio_regulator_disable(struct device *dev,
+                struct gpio_switch_regulator *ri)
+{
+        int init_val;
+        int ret;
+
+        if (ri->disable_rail) {
+                ret = ri->disable_rail(ri->psubdev_data);
+                if (ret < 0)
+                        dev_err(dev, "Unable to disable rail through "
+                                "board api %d\n", ret);
+        } else {
+                init_val = (ri->active_low) ? 1 : 0;
+                ret = gpio_direction_output(ri->gpio_nr, init_val);
+                if (ret < 0)
+                        dev_err(dev, "Unable to set direction %d\n",
+                                ri->gpio_nr);
+        }
+        return ret;
+}
+
+static int gpio_switch_list_voltage(struct regulator_dev *rdev,
+                                unsigned selector)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+
+        if (selector < ri->reg_desc.n_voltages)
+                return ri->voltages[selector] * 1000;
+        else
+                return 0;
+}
+
+static int gpio_switch_set_voltage(struct regulator_dev *rdev,
+                                   int min_uV, int max_uV, unsigned *selector)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+        int uV;
+        bool found = false;
+        unsigned val;
+
+        for (val = 0; val < ri->reg_desc.n_voltages; val++) {
+                uV = ri->voltages[val] * 1000;
+                if (min_uV <= uV && uV <= max_uV) {
+                        found = true;
+                        *selector = ri->curr_vol_sel = val;
+                        break;
+                }
+        }
+        if (found && ri->input_regulator)
+                return regulator_set_voltage(ri->input_regulator, min_uV,
+                        max_uV);
+        ri->curr_vol_sel = 0;
+        return -EINVAL;
+}
+
+static int gpio_switch_get_voltage(struct regulator_dev *rdev)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+        if (ri->input_regulator)
+                return regulator_get_voltage(ri->input_regulator);
+
+        if (ri->curr_vol_sel < ri->reg_desc.n_voltages)
+                return ri->voltages[ri->curr_vol_sel] * 1000;
+        return 0;
+}
+
+static int gpio_switch_regulator_enable(struct regulator_dev *rdev)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+        int ret = 0;
+        if (ri->is_enable)
+                return 0;
+
+        if (ri->input_regulator) {
+                ret = regulator_enable(ri->input_regulator);
+                if (ret < 0) {
+                        dev_err(&rdev->dev, "%s:Failed to enable regulator"
+                                " Error %d\n", __func__, ret);
+                        return ret;
+                }
+        }
+
+        ret = _gpio_regulator_enable(&rdev->dev, ri);
+        if (ret < 0)
+                return ret;
+        ri->is_enable = true;
+        return 0;
+}
+
+static int gpio_switch_regulator_disable(struct regulator_dev *rdev)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+        int ret = 0;
+
+        if (!ri->is_enable)
+                return 0;
+
+        ret = _gpio_regulator_disable(&rdev->dev, ri);
+        if (ret < 0)
+                return ret;
+
+        if (ri->input_regulator) {
+                ret = regulator_disable(ri->input_regulator);
+                if (ret < 0) {
+                        dev_err(&rdev->dev, "%s:Failed to disable regulator"
+                                " Error %d\n", __func__, ret);
+                        return ret;
+                }
+        }
+
+        ri->is_enable = false;
+        return 0;
+}
+
+static int gpio_switch_regulator_is_enabled(struct regulator_dev *rdev)
+{
+        struct gpio_switch_regulator *ri = rdev_get_drvdata(rdev);
+        int ret = 0;
+        if (ri->input_regulator) {
+                ret = regulator_is_enabled(ri->input_regulator);
+                if (!ret)
+                        return ret;
+        }
+        return (ri->is_enable) ? 1 : 0;
+}
+
+static struct regulator_ops gpio_switch_regulator_