diff options
Diffstat (limited to 'drivers/regulator/tps65090-regulator.c')
| -rw-r--r-- | drivers/regulator/tps65090-regulator.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c new file mode 100644 index 00000000000..6c28e3a3f66 --- /dev/null +++ b/drivers/regulator/tps65090-regulator.c @@ -0,0 +1,197 @@ +/* + * Regulator driver for tps65090 power management chip. + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + + * 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/mfd/tps65090.h> +#include <linux/regulator/tps65090-regulator.h> + +struct tps65090_regulator { + int id; + /* Regulator register address.*/ + u8 reg_en_reg; + u8 en_bit; + + /* used by regulator core */ + struct regulator_desc desc; + + /* Device */ + struct device *dev; +}; + +static inline struct device *to_tps65090_dev(struct regulator_dev *rdev) +{ + return rdev_get_dev(rdev)->parent->parent; +} + +static int tps65090_reg_is_enabled(struct regulator_dev *rdev) +{ + struct tps65090_regulator *ri = rdev_get_drvdata(rdev); + struct device *parent = to_tps65090_dev(rdev); + uint8_t control; + int ret; + + ret = tps65090_read(parent, ri->reg_en_reg, &control); + if (ret < 0) { + dev_err(&rdev->dev, "Error in reading reg 0x%x\n", + ri->reg_en_reg); + return ret; + } + return (((control >> ri->en_bit) & 1) == 1); +} + +static int tps65090_reg_enable(struct regulator_dev *rdev) +{ + struct tps65090_regulator *ri = rdev_get_drvdata(rdev); + struct device *parent = to_tps65090_dev(rdev); + int ret; + + ret = tps65090_set_bits(parent, ri->reg_en_reg, ri->en_bit); + if (ret < 0) + dev_err(&rdev->dev, "Error in updating reg 0x%x\n", + ri->reg_en_reg); + return ret; +} + +static int tps65090_reg_disable(struct regulator_dev *rdev) +{ + struct tps65090_regulator *ri = rdev_get_drvdata(rdev); + struct device *parent = to_tps65090_dev(rdev); + int ret; + + ret = tps65090_clr_bits(parent, ri->reg_en_reg, ri->en_bit); + if (ret < 0) + dev_err(&rdev->dev, "Error in updating reg 0x%x\n", + ri->reg_en_reg); + + return ret; +} + +static struct regulator_ops tps65090_ops = { + .enable = tps65090_reg_enable, + .disable = tps65090_reg_disable, + .is_enabled = tps65090_reg_is_enabled, +}; + +#define tps65090_REG(_id, _en_reg, _en_bit, _ops) \ +{ \ + .reg_en_reg = _en_reg, \ + .en_bit = _en_bit, \ + .id = TPS65090_ID_##_id, \ + .desc = { \ + .name = tps65090_rails(_id), \ + .id = TPS65090_ID_##_id, \ + .ops = &_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + }, \ +} + +static struct tps65090_regulator TPS65090_regulator[] = { + tps65090_REG(DCDC1, 12, 0, tps65090_ops), + tps65090_REG(DCDC2, 13, 0, tps65090_ops), + tps65090_REG(DCDC3, 14, 0, tps65090_ops), + tps65090_REG(FET1, 15, 0, tps65090_ops), + tps65090_REG(FET2, 16, 0, tps65090_ops), + tps65090_REG(FET3, 17, 0, tps65090_ops), + tps65090_REG(FET4, 18, 0, tps65090_ops), + tps65090_REG(FET5, 19, 0, tps65090_ops), + tps65090_REG(FET6, 20, 0, tps65090_ops), + tps65090_REG(FET7, 21, 0, tps65090_ops), +}; + +static inline struct tps65090_regulator *find_regulator_info(int id) +{ + struct tps65090_regulator *ri; + int i; + + for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) { + ri = &TPS65090_regulator[i]; + if (ri->desc.id == id) + return ri; + } + return NULL; +} + +static int __devinit tps65090_regulator_probe(struct platform_device *pdev) +{ + struct tps65090_regulator *ri = NULL; + struct regulator_dev *rdev; + struct tps65090_regulator_platform_data *tps_pdata; + int id = pdev->id; + + dev_dbg(&pdev->dev, "Probing regulator %d\n", id); + + ri = find_regulator_info(id); + if (ri == NULL) { + dev_err(&pdev->dev, "invalid regulator ID specified\n"); + return -EINVAL; + } + tps_pdata = pdev->dev.platform_data; + ri->dev = &pdev->dev; + + rdev = regulator_register(&ri->desc, &pdev->dev, + &tps_pdata->regulator, ri, NULL); + if (IS_ERR_OR_NULL(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 tps65090_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + regulator_unregister(rdev); + return 0; +} + +static struct platform_driver tps65090_regulator_driver = { + .driver = { + .name = "tps65090-regulator", + .owner = THIS_MODULE, + }, + .probe = tps65090_regulator_probe, + .remove = __devexit_p(tps65090_regulator_remove), +}; + +static int __init tps65090_regulator_init(void) +{ + return platform_driver_register(&tps65090_regulator_driver); +} +subsys_initcall(tps65090_regulator_init); + +static void __exit tps65090_regulator_exit(void) +{ + platform_driver_unregister(&tps65090_regulator_driver); +} +module_exit(tps65090_regulator_exit); + +MODULE_DESCRIPTION("tps65090 regulator driver"); +MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); +MODULE_LICENSE("GPL v2"); |