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linux/drivers/regulator/db8500-prcmu.c
Uwe Kleine-König 0210a60aad regulator: db8500-prcmu: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://msgid.link/r/fcaa42d7dd707031ed8dd9e8c28483891b879965.1701778038.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-12-11 12:54:27 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson SA 2010
*
* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
*
* Power domain regulators on DB8500
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/db8500-prcmu.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of.h>
#include <linux/module.h>
#include "dbx500-prcmu.h"
static int db8500_regulator_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
info->desc.name);
if (!info->is_enabled) {
info->is_enabled = true;
if (!info->exclude_from_power_state)
power_state_active_enable();
}
return 0;
}
static int db8500_regulator_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret = 0;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
info->desc.name);
if (info->is_enabled) {
info->is_enabled = false;
if (!info->exclude_from_power_state)
ret = power_state_active_disable();
}
return ret;
}
static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
" %i\n", info->desc.name, info->is_enabled);
return info->is_enabled;
}
/* db8500 regulator operations */
static const struct regulator_ops db8500_regulator_ops = {
.enable = db8500_regulator_enable,
.disable = db8500_regulator_disable,
.is_enabled = db8500_regulator_is_enabled,
};
/*
* EPOD control
*/
static bool epod_on[NUM_EPOD_ID];
static bool epod_ramret[NUM_EPOD_ID];
static int enable_epod(u16 epod_id, bool ramret)
{
int ret;
if (ramret) {
if (!epod_on[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
}
epod_ramret[epod_id] = true;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
if (ret < 0)
return ret;
epod_on[epod_id] = true;
}
return 0;
}
static int disable_epod(u16 epod_id, bool ramret)
{
int ret;
if (ramret) {
if (!epod_on[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_ramret[epod_id] = false;
} else {
if (epod_ramret[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_on[epod_id] = false;
}
return 0;
}
/*
* Regulator switch
*/
static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
info->desc.name);
ret = enable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator-switch-%s-enable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = true;
out:
return ret;
}
static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
info->desc.name);
ret = disable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator_switch-%s-disable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = false;
out:
return ret;
}
static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev),
"regulator-switch-%s-is_enabled (is_enabled): %i\n",
info->desc.name, info->is_enabled);
return info->is_enabled;
}
static const struct regulator_ops db8500_regulator_switch_ops = {
.enable = db8500_regulator_switch_enable,
.disable = db8500_regulator_switch_disable,
.is_enabled = db8500_regulator_switch_is_enabled,
};
/*
* Regulator information
*/
static struct dbx500_regulator_info
dbx500_regulator_info[DB8500_NUM_REGULATORS] = {
[DB8500_REGULATOR_VAPE] = {
.desc = {
.name = "db8500-vape",
.of_match = of_match_ptr("db8500_vape"),
.id = DB8500_REGULATOR_VAPE,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VARM] = {
.desc = {
.name = "db8500-varm",
.of_match = of_match_ptr("db8500_varm"),
.id = DB8500_REGULATOR_VARM,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VMODEM] = {
.desc = {
.name = "db8500-vmodem",
.of_match = of_match_ptr("db8500_vmodem"),
.id = DB8500_REGULATOR_VMODEM,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VPLL] = {
.desc = {
.name = "db8500-vpll",
.of_match = of_match_ptr("db8500_vpll"),
.id = DB8500_REGULATOR_VPLL,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VSMPS1] = {
.desc = {
.name = "db8500-vsmps1",
.of_match = of_match_ptr("db8500_vsmps1"),
.id = DB8500_REGULATOR_VSMPS1,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VSMPS2] = {
.desc = {
.name = "db8500-vsmps2",
.of_match = of_match_ptr("db8500_vsmps2"),
.id = DB8500_REGULATOR_VSMPS2,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.fixed_uV = 1800000,
.n_voltages = 1,
},
.exclude_from_power_state = true,
},
[DB8500_REGULATOR_VSMPS3] = {
.desc = {
.name = "db8500-vsmps3",
.of_match = of_match_ptr("db8500_vsmps3"),
.id = DB8500_REGULATOR_VSMPS3,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VRF1] = {
.desc = {
.name = "db8500-vrf1",
.of_match = of_match_ptr("db8500_vrf1"),
.id = DB8500_REGULATOR_VRF1,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
.desc = {
.name = "db8500-sva-mmdsp",
.of_match = of_match_ptr("db8500_sva_mmdsp"),
.id = DB8500_REGULATOR_SWITCH_SVAMMDSP,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAMMDSP,
},
[DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
.desc = {
.name = "db8500-sva-mmdsp-ret",
.of_match = of_match_ptr("db8500_sva_mmdsp_ret"),
.id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAMMDSP,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_SVAPIPE] = {
.desc = {
.name = "db8500-sva-pipe",
.of_match = of_match_ptr("db8500_sva_pipe"),
.id = DB8500_REGULATOR_SWITCH_SVAPIPE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAPIPE,
},
[DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
.desc = {
.name = "db8500-sia-mmdsp",
.of_match = of_match_ptr("db8500_sia_mmdsp"),
.id = DB8500_REGULATOR_SWITCH_SIAMMDSP,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAMMDSP,
},
[DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
.desc = {
.name = "db8500-sia-mmdsp-ret",
.of_match = of_match_ptr("db8500_sia_mmdsp_ret"),
.id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAMMDSP,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_SIAPIPE] = {
.desc = {
.name = "db8500-sia-pipe",
.of_match = of_match_ptr("db8500_sia_pipe"),
.id = DB8500_REGULATOR_SWITCH_SIAPIPE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAPIPE,
},
[DB8500_REGULATOR_SWITCH_SGA] = {
.desc = {
.name = "db8500-sga",
.of_match = of_match_ptr("db8500_sga"),
.id = DB8500_REGULATOR_SWITCH_SGA,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SGA,
},
[DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
.desc = {
.name = "db8500-b2r2-mcde",
.of_match = of_match_ptr("db8500_b2r2_mcde"),
.id = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_B2R2_MCDE,
},
[DB8500_REGULATOR_SWITCH_ESRAM12] = {
.desc = {
.name = "db8500-esram12",
.of_match = of_match_ptr("db8500_esram12"),
.id = DB8500_REGULATOR_SWITCH_ESRAM12,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM12,
.is_enabled = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
.desc = {
.name = "db8500-esram12-ret",
.of_match = of_match_ptr("db8500_esram12_ret"),
.id = DB8500_REGULATOR_SWITCH_ESRAM12RET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM12,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM34] = {
.desc = {
.name = "db8500-esram34",
.of_match = of_match_ptr("db8500_esram34"),
.id = DB8500_REGULATOR_SWITCH_ESRAM34,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM34,
.is_enabled = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
.desc = {
.name = "db8500-esram34-ret",
.of_match = of_match_ptr("db8500_esram34_ret"),
.id = DB8500_REGULATOR_SWITCH_ESRAM34RET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM34,
.is_ramret = true,
},
};
static int db8500_regulator_probe(struct platform_device *pdev)
{
struct regulator_init_data *db8500_init_data;
struct dbx500_regulator_info *info;
struct regulator_config config = { };
struct regulator_dev *rdev;
int err, i;
db8500_init_data = dev_get_platdata(&pdev->dev);
for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
/* assign per-regulator data */
info = &dbx500_regulator_info[i];
config.driver_data = info;
config.dev = &pdev->dev;
if (db8500_init_data)
config.init_data = &db8500_init_data[i];
rdev = devm_regulator_register(&pdev->dev, &info->desc,
&config);
if (IS_ERR(rdev)) {
err = PTR_ERR(rdev);
dev_err(&pdev->dev, "failed to register %s: err %i\n",
info->desc.name, err);
return err;
}
dev_dbg(&pdev->dev, "regulator-%s-probed\n", info->desc.name);
}
ux500_regulator_debug_init(pdev, dbx500_regulator_info,
ARRAY_SIZE(dbx500_regulator_info));
return 0;
}
static void db8500_regulator_remove(struct platform_device *pdev)
{
ux500_regulator_debug_exit();
}
static struct platform_driver db8500_regulator_driver = {
.driver = {
.name = "db8500-prcmu-regulators",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = db8500_regulator_probe,
.remove_new = db8500_regulator_remove,
};
static int __init db8500_regulator_init(void)
{
return platform_driver_register(&db8500_regulator_driver);
}
static void __exit db8500_regulator_exit(void)
{
platform_driver_unregister(&db8500_regulator_driver);
}
arch_initcall(db8500_regulator_init);
module_exit(db8500_regulator_exit);
MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
MODULE_DESCRIPTION("DB8500 regulator driver");
MODULE_LICENSE("GPL v2");
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