arch/arm/mach-msm/proccomm-regulator.c - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (c) 2011-2012, The Linux Foundation. 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 <mach/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);
	/*
	* Copyright (c) 2011-2012, The Linux Foundation. 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 <mach/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);