--- /dev/null
+/*
+ * 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/delay.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_en_reg;
+ uint8_t en_bit;
+ uint8_t reg_disc_reg;
+ uint8_t disc_bit;
+ uint8_t vout_reg;
+ uint8_t vout_mask;
+ uint8_t deepsleep_reg;
+
+ /* Chip constraints on regulator behavior */
+ int min_uV;
+ int max_uV;
+ int step_uV;
+ int nsteps;
+
+ /* 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_reg_is_enabled(struct regulator_dev *rdev)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ uint8_t control;
+ int ret;
+
+ ret = rc5t583_read(reg->mfd->dev, ri->reg_en_reg, &control);
+ if (ret < 0) {
+ dev_err(&rdev->dev,
+ "Error in reading the control register 0x%02x\n",
+ ri->reg_en_reg);
+ return ret;
+ }
+ return !!(control & BIT(ri->en_bit));
+}
+
+static int rc5t583_reg_enable(struct regulator_dev *rdev)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ int ret;
+
+ ret = rc5t583_set_bits(reg->mfd->dev, ri->reg_en_reg,
+ (1 << ri->en_bit));
+ if (ret < 0) {
+ dev_err(&rdev->dev,
+ "Error in setting bit of STATE register 0x%02x\n",
+ ri->reg_en_reg);
+ return ret;
+ }
+ return ret;
+}
+
+static int rc5t583_reg_disable(struct regulator_dev *rdev)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ int ret;
+
+ ret = rc5t583_clear_bits(reg->mfd->dev, ri->reg_en_reg,
+ (1 << ri->en_bit));
+ if (ret < 0)
+ dev_err(&rdev->dev,
+ "Error in clearing bit of STATE register 0x%02x\n",
+ ri->reg_en_reg);
+
+ return ret;
+}
+
+static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ return ri->min_uV + (ri->step_uV * selector);
+}
+
+static int rc5t583_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ int ret;
+ if (selector > ri->nsteps) {
+ dev_err(&rdev->dev, "Invalid selector 0x%02x\n", selector);
+ return -EINVAL;
+ }
+
+ ret = rc5t583_update(reg->mfd->dev, ri->vout_reg,
+ selector, ri->vout_mask);
+ if (ret < 0)
+ dev_err(&rdev->dev,
+ "Error in update voltage register 0x%02x\n", ri->vout_reg);
+ return ret;
+}
+
+static int rc5t583_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ struct rc5t583_regulator_info *ri = reg->reg_info;
+ uint8_t vsel;
+ int ret;
+ ret = rc5t583_read(reg->mfd->dev, ri->vout_reg, &vsel);
+ if (ret < 0) {
+ dev_err(&rdev->dev,
+ "Error in reading voltage register 0x%02x\n", ri->vout_reg);
+ return ret;
+ }
+ return vsel & ri->vout_mask;
+}
+
+static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
+{
+ struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
+ int vsel = rc5t583_get_voltage_sel(rdev);
+ int curr_uV = rc5t583_list_voltage(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 = rc5t583_list_voltage(rdev, old_selector);
+
+ if (old_uV < 0)
+ return old_uV;
+
+ new_uV = rc5t583_list_voltage(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 = rc5t583_reg_is_enabled,
+ .enable = rc5t583_reg_enable,
+ .disable = rc5t583_reg_disable,
+ .enable_time = rc5t583_regulator_enable_time,
+ .get_voltage_sel = rc5t583_get_voltage_sel,
+ .set_voltage_sel = rc5t583_set_voltage_sel,
+ .list_voltage = rc5t583_list_voltage,
+ .set_voltage_time_sel = rc5t583_set_voltage_time_sel,
+};
+
+#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, _vout_reg, \
+ _vout_mask, _ds_reg, _min_mv, _max_mv, _step_uV, _nsteps, \
+ _enable_mv) \
+{ \
+ .reg_en_reg = RC5T583_REG_##_en_reg, \
+ .en_bit = _en_bit, \
+ .reg_disc_reg = RC5T583_REG_##_disc_reg, \
+ .disc_bit = _disc_bit, \
+ .vout_reg = RC5T583_REG_##_vout_reg, \
+ .vout_mask = _vout_mask, \
+ .deepsleep_reg = RC5T583_REG_##_ds_reg, \
+ .min_uV = _min_mv * 1000, \
+ .max_uV = _max_mv * 1000, \
+ .step_uV = _step_uV, \
+ .nsteps = _nsteps, \
+ .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 = _nsteps, \
+ .ops = &rc5t583_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+}
+
+static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
+ RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, DC0DAC, 0x7F, DC0DAC_DS,
+ 700, 1500, 12500, 0x41, 4),
+ RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, DC1DAC, 0x7F, DC1DAC_DS,
+ 700, 1500, 12500, 0x41, 14),
+ RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, DC2DAC, 0x7F, DC2DAC_DS,
+ 900, 2400, 12500, 0x79, 14),
+ RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, DC3DAC, 0x7F, DC3DAC_DS,
+ 900, 2400, 12500, 0x79, 14),
+ RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, LDO0DAC, 0x7F, LDO0DAC_DS,
+ 900, 3400, 25000, 0x65, 160),
+ RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, LDO1DAC, 0x7F, LDO1DAC_DS,
+ 900, 3400, 25000, 0x65, 160),
+ RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, LDO2DAC, 0x7F, LDO2DAC_DS,
+ 900, 3400, 25000, 0x65, 160),
+ RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, LDO3DAC, 0x7F, LDO3DAC_DS,
+ 900, 3400, 25000, 0x65, 160),
+ RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, LDO4DAC, 0x3F, LDO4DAC_DS,
+ 750, 1500, 12500, 0x3D, 133),
+ RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, LDO5DAC, 0x7F, LDO5DAC_DS,
+ 900, 3400, 25000, 0x65, 267),
+ RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, LDO6DAC, 0x7F, LDO6DAC_DS,
+ 900, 3400, 25000, 0x65, 133),
+ RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, LDO7DAC, 0x7F, LDO7DAC_DS,
+ 900, 3400, 25000, 0x65, 233),
+ RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, LDO8DAC, 0x7F, LDO8DAC_DS,
+ 900, 3400, 25000, 0x65, 233),
+ RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, LDO9DAC, 0x7F, LDO9DAC_DS,
+ 900, 3400, 25000, 0x65, 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 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 = ®s[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:
+ rdev = regulator_register(&ri->desc, &pdev->dev,
+ reg_data, reg, NULL);
+ if (IS_ERR_OR_NULL(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");
projects / deliverable / linux.git / commitdiff
