blob: fff3a11549c71b3afdda342904fcb58154b772a1 [file] [log] [blame]
/*
* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include "proc_comm.h"
#include "proccomm-regulator.h"
#define MV_TO_UV(mv) ((mv)*1000)
#define UV_TO_MV(uv) (((uv)+999)/1000)
/*
* Wrappers for the msm_proc_comm() calls.
* Does basic impedance matching between what the proccomm interface
* expects and how the driver sees the world.
*/
/* Converts a proccomm error to an errno value. */
static int _pcom_err_to_linux_errno(unsigned error)
{
if (!error) /* 0 == no error */
return 0;
else if (error & 0x1F) /* bits 0..4 => parameter 1..5 out of range */
return -EDOM;
else if (error & 0x100) /* bit 8 => feature not supported */
return -ENOSYS;
else /* anything else non-zero: unknown error */
return -EINVAL;
}
/* vreg_switch: (vreg ID, on/off) => (return code, <null>) */
static int _vreg_switch(int vreg_id, bool enable)
{
unsigned _id = (unsigned)vreg_id;
unsigned _enable = !!enable;
return msm_proc_comm(PCOM_VREG_SWITCH, &_id, &_enable);
}
/* vreg_set_level: (vreg ID, mV) => (return code, <null>) */
static int _vreg_set_level(int vreg_id, int level_mV)
{
unsigned _id = (unsigned)vreg_id;
unsigned _level = (unsigned)level_mV;
int rc;
rc = msm_proc_comm(PCOM_VREG_SET_LEVEL, &_id, &_level);
if (rc)
return rc;
return _pcom_err_to_linux_errno(_id);
}
/* vreg_pull_down: (pull down, vreg ID) => (<null>, <null>) */
/* Returns error code from msm_proc_comm. */
static int _vreg_pull_down(int vreg_id, bool pull_down)
{
unsigned _id = (unsigned)vreg_id;
unsigned _enable = !!pull_down;
return msm_proc_comm(PCOM_VREG_PULLDOWN, &_enable, &_id);
}
struct proccomm_regulator_drvdata {
struct regulator_desc rdesc;
int rise_time;
int last_voltage;
bool enabled;
bool negative;
};
static int proccomm_vreg_enable(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *ddata;
int rc;
ddata = rdev_get_drvdata(rdev);
rc = _vreg_switch(rdev_get_id(rdev), VREG_SWITCH_ENABLE);
if (rc) {
dev_err(rdev_get_dev(rdev),
"could not enable regulator %d (%s): %d\n",
rdev_get_id(rdev), ddata->rdesc.name, rc);
} else {
dev_dbg(rdev_get_dev(rdev),
"enabled regulator %d (%s)\n",
rdev_get_id(rdev), ddata->rdesc.name);
ddata->enabled = 1;
}
return rc;
}
static int proccomm_vreg_disable(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *ddata;
int rc;
ddata = rdev_get_drvdata(rdev);
rc = _vreg_switch(rdev_get_id(rdev), VREG_SWITCH_DISABLE);
if (rc) {
dev_err(rdev_get_dev(rdev),
"could not disable regulator %d (%s): %d\n",
rdev_get_id(rdev), ddata->rdesc.name, rc);
} else {
dev_dbg(rdev_get_dev(rdev),
"disabled regulator %d (%s)\n",
rdev_get_id(rdev), ddata->rdesc.name);
ddata->enabled = 0;
}
return rc;
}
static int proccomm_vreg_is_enabled(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *ddata = rdev_get_drvdata(rdev);
return ddata->enabled;
}
static int proccomm_vreg_rise_time(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *ddata = rdev_get_drvdata(rdev);
return ddata->rise_time;
}
static int proccomm_vreg_get_voltage(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *ddata = rdev_get_drvdata(rdev);
return MV_TO_UV(ddata->last_voltage);
}
static int proccomm_vreg_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned *sel)
{
struct proccomm_regulator_drvdata *ddata = rdev_get_drvdata(rdev);
int level_mV = UV_TO_MV(min_uV);
int rc;
rc = _vreg_set_level(rdev_get_id(rdev),
ddata->negative ? -level_mV : level_mV);
if (rc) {
dev_err(rdev_get_dev(rdev),
"could not set voltage for regulator %d (%s) "
"to %d mV: %d\n",
rdev_get_id(rdev), ddata->rdesc.name, level_mV, rc);
} else {
dev_dbg(rdev_get_dev(rdev),
"voltage for regulator %d (%s) set to %d mV\n",
rdev_get_id(rdev), ddata->rdesc.name, level_mV);
ddata->last_voltage = level_mV;
}
return rc;
}
static struct regulator_ops proccomm_regulator_ops = {
.enable = proccomm_vreg_enable,
.disable = proccomm_vreg_disable,
.is_enabled = proccomm_vreg_is_enabled,
.get_voltage = proccomm_vreg_get_voltage,
.set_voltage = proccomm_vreg_set_voltage,
.enable_time = proccomm_vreg_rise_time,
};
/*
* Create and register a struct regulator_dev based on the information in
* a struct proccomm_regulator_info.
* Fills in the rdev field in struct proccomm_regulator_info.
*/
static struct regulator_dev *__devinit create_proccomm_rdev(
struct proccomm_regulator_info *info, struct device *parent)
{
const char *name;
struct proccomm_regulator_drvdata *d;
struct regulator_dev *rdev;
int rc = 0;
if (info->id < 0) {
dev_err(parent, "invalid regulator id %d\n", info->id);
rc = -EINVAL;
goto out;
}
name = info->init_data.constraints.name;
if (!name) {
dev_err(parent,
"could not register regulator with id %d: "
"no name specified\n", info->id);
rc = -EINVAL;
goto out;
}
if (info->pulldown > 0) {
rc = _vreg_pull_down(info->id, info->pulldown);
if (rc) {
dev_err(parent,
"probing for regulator %d (%s) failed\n",
info->id, name);
goto out;
}
}
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
dev_err(parent,
"could not allocate struct proccomm_regulator_drvdata "
"for regulator %d (%s)\n", info->id, name);
rc = -ENOMEM;
goto out;
}
d->rdesc.name = name;
d->rdesc.id = info->id;
d->rdesc.ops = &proccomm_regulator_ops;
d->rdesc.type = REGULATOR_VOLTAGE;
d->rdesc.owner = THIS_MODULE;
d->rise_time = info->rise_time;
d->enabled = 0;
d->negative = info->negative;
d->rdesc.n_voltages = info->n_voltages;
rdev = regulator_register(&d->rdesc, parent, &info->init_data, d, NULL);
if (IS_ERR(rdev)) {
rc = PTR_ERR(rdev);
dev_err(parent, "error registering regulator %d (%s): %d\n",
info->id, name, rc);
goto clean;
}
dev_dbg(parent, "registered regulator %d (%s)\n", info->id, name);
return rdev;
clean:
kfree(d);
out:
return ERR_PTR(rc);
}
/*
* Unregister and destroy a struct regulator_dev created by
* create_proccomm_rdev.
*/
static void destroy_proccomm_rdev(struct regulator_dev *rdev)
{
struct proccomm_regulator_drvdata *d;
if (!rdev)
return;
d = rdev_get_drvdata(rdev);
regulator_unregister(rdev);
dev_dbg(rdev_get_dev(rdev)->parent,
"unregistered regulator %d (%s)\n",
d->rdesc.id, d->rdesc.name);
kfree(d);
}
static int __devinit proccomm_vreg_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct proccomm_regulator_platform_data *pdata = dev->platform_data;
struct regulator_dev **rdevs;
int rc = 0;
size_t i = 0;
if (!pdata) {
dev_err(dev, "invalid platform data\n");
rc = -EINVAL;
goto check_fail;
}
if (pdata->nregs == 0) {
dev_err(dev, "registering an empty regulator list; "
"this is probably not what you want\n");
rc = -EINVAL;
goto check_fail;
}
rdevs = kcalloc(pdata->nregs, sizeof(*rdevs), GFP_KERNEL);
if (!rdevs) {
dev_err(dev, "could not allocate storage for "
"struct regulator_dev array\n");
rc = -ENOMEM;
goto check_fail;
}
platform_set_drvdata(pdev, rdevs);
dev_dbg(dev, "registering %d proccomm regulators\n", pdata->nregs);
for (i = 0; i < pdata->nregs; i++) {
rdevs[i] = create_proccomm_rdev(&pdata->regs[i], dev);
if (IS_ERR(rdevs[i])) {
rc = PTR_ERR(rdevs[i]);
goto backout;
}
}
dev_dbg(dev, "%d proccomm regulators registered\n", pdata->nregs);
return rc;
backout:
while (--i >= 0)
destroy_proccomm_rdev(rdevs[i]);
kfree(rdevs);
check_fail:
return rc;
}
static int __devexit proccomm_vreg_remove(struct platform_device *pdev)
{
struct proccomm_regulator_platform_data *pdata;
struct regulator_dev **rdevs;
size_t i;
pdata = pdev->dev.platform_data;
rdevs = platform_get_drvdata(pdev);
for (i = 0; i < pdata->nregs; i++)
destroy_proccomm_rdev(rdevs[i]);
kfree(rdevs);
return 0;
}
static struct platform_driver proccomm_vreg_driver = {
.probe = proccomm_vreg_probe,
.remove = __devexit_p(proccomm_vreg_remove),
.driver = {
.name = PROCCOMM_REGULATOR_DEV_NAME,
.owner = THIS_MODULE,
},
};
static int __init proccomm_vreg_init(void)
{
return platform_driver_register(&proccomm_vreg_driver);
}
postcore_initcall(proccomm_vreg_init);
static void __exit proccomm_vreg_exit(void)
{
platform_driver_unregister(&proccomm_vreg_driver);
}
module_exit(proccomm_vreg_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ProcComm regulator driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:" PROCCOMM_REGULATOR_DEV_NAME);