linux-stable/drivers/regulator/tps65090-regulator.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

533 lines
15 KiB
C

/*
* 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/gpio.h>
#include <linux/of_gpio.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/regulator/of_regulator.h>
#include <linux/mfd/tps65090.h>
#define MAX_CTRL_READ_TRIES 5
#define MAX_FET_ENABLE_TRIES 1000
#define CTRL_EN_BIT 0 /* Regulator enable bit, active high */
#define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */
#define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */
#define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */
#define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */
/**
* struct tps65090_regulator - Per-regulator data for a tps65090 regulator
*
* @dev: Pointer to our device.
* @desc: The struct regulator_desc for the regulator.
* @rdev: The struct regulator_dev for the regulator.
* @overcurrent_wait_valid: True if overcurrent_wait is valid.
* @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
*/
struct tps65090_regulator {
struct device *dev;
struct regulator_desc *desc;
struct regulator_dev *rdev;
bool overcurrent_wait_valid;
int overcurrent_wait;
};
static struct regulator_ops tps65090_ext_control_ops = {
};
/**
* tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
*
* This will set the overcurrent wait time based on what's in the regulator
* info.
*
* @ri: Overall regulator data
* @rdev: Regulator device
*
* Return: 0 if no error, non-zero if there was an error writing the register.
*/
static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
struct regulator_dev *rdev)
{
int ret;
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
ri->overcurrent_wait << CTRL_WT_BIT);
if (ret) {
dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
rdev->desc->enable_reg);
}
return ret;
}
/**
* tps65090_try_enable_fet - Try to enable a FET
*
* @rdev: Regulator device
*
* Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
* set, or some other -ve value if another error occurred (e.g. i2c error)
*/
static int tps65090_try_enable_fet(struct regulator_dev *rdev)
{
unsigned int control;
int ret, i;
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask);
if (ret < 0) {
dev_err(&rdev->dev, "Error in updating reg %#x\n",
rdev->desc->enable_reg);
return ret;
}
for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
&control);
if (ret < 0)
return ret;
if (!(control & BIT(CTRL_TO_BIT)))
break;
usleep_range(1000, 1500);
}
if (!(control & BIT(CTRL_PG_BIT)))
return -ENOTRECOVERABLE;
return 0;
}
/**
* tps65090_fet_enable - Enable a FET, trying a few times if it fails
*
* Some versions of the tps65090 have issues when turning on the FETs.
* This function goes through several steps to ensure the best chance of the
* FET going on. Specifically:
* - We'll make sure that we bump the "overcurrent wait" to the maximum, which
* increases the chances that we'll turn on properly.
* - We'll retry turning the FET on multiple times (turning off in between).
*
* @rdev: Regulator device
*
* Return: 0 if ok, non-zero if it fails.
*/
static int tps65090_fet_enable(struct regulator_dev *rdev)
{
int ret, tries;
/*
* Try enabling multiple times until we succeed since sometimes the
* first try times out.
*/
tries = 0;
while (true) {
ret = tps65090_try_enable_fet(rdev);
if (!ret)
break;
if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES)
goto err;
/* Try turning the FET off (and then on again) */
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, 0);
if (ret)
goto err;
tries++;
}
if (tries)
dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
rdev->desc->enable_reg, tries);
return 0;
err:
dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
WARN_ON(1);
return ret;
}
static struct regulator_ops tps65090_reg_control_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_ops tps65090_fet_control_ops = {
.enable = tps65090_fet_enable,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_ops tps65090_ldo_ops = {
};
#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \
{ \
.name = "TPS65090_RAILS"#_id, \
.supply_name = _sname, \
.id = TPS65090_REGULATOR_##_id, \
.n_voltages = _nvolt, \
.ops = &_ops, \
.fixed_uV = _volt, \
.enable_reg = _en_reg, \
.enable_val = _en_bits, \
.enable_mask = _en_bits, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \
tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops)
#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \
tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops)
static struct regulator_desc tps65090_regulator_desc[] = {
tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000,
tps65090_reg_control_ops),
tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000,
tps65090_reg_control_ops),
tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT),
tps65090_reg_control_ops),
tps65090_REG_SWITCH(FET1, "infet1", 0x0F,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET2, "infet2", 0x10,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET3, "infet3", 0x11,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET4, "infet4", 0x12,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET5, "infet5", 0x13,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET6, "infet6", 0x14,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_SWITCH(FET7, "infet7", 0x15,
BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
tps65090_fet_control_ops),
tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000,
tps65090_ldo_ops),
tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000,
tps65090_ldo_ops),
};
static inline bool is_dcdc(int id)
{
switch (id) {
case TPS65090_REGULATOR_DCDC1:
case TPS65090_REGULATOR_DCDC2:
case TPS65090_REGULATOR_DCDC3:
return true;
default:
return false;
}
}
static int tps65090_config_ext_control(
struct tps65090_regulator *ri, bool enable)
{
int ret;
struct device *parent = ri->dev->parent;
unsigned int reg_en_reg = ri->desc->enable_reg;
if (enable)
ret = tps65090_set_bits(parent, reg_en_reg, 1);
else
ret = tps65090_clr_bits(parent, reg_en_reg, 1);
if (ret < 0)
dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
return ret;
}
static int tps65090_regulator_disable_ext_control(
struct tps65090_regulator *ri,
struct tps65090_regulator_plat_data *tps_pdata)
{
int ret = 0;
struct device *parent = ri->dev->parent;
unsigned int reg_en_reg = ri->desc->enable_reg;
/*
* First enable output for internal control if require.
* And then disable external control.
*/
if (tps_pdata->reg_init_data->constraints.always_on ||
tps_pdata->reg_init_data->constraints.boot_on) {
ret = tps65090_set_bits(parent, reg_en_reg, 0);
if (ret < 0) {
dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
return ret;
}
}
return tps65090_config_ext_control(ri, false);
}
static void tps65090_configure_regulator_config(
struct tps65090_regulator_plat_data *tps_pdata,
struct regulator_config *config)
{
if (gpio_is_valid(tps_pdata->gpio)) {
int gpio_flag = GPIOF_OUT_INIT_LOW;
if (tps_pdata->reg_init_data->constraints.always_on ||
tps_pdata->reg_init_data->constraints.boot_on)
gpio_flag = GPIOF_OUT_INIT_HIGH;
config->ena_gpio = tps_pdata->gpio;
config->ena_gpio_initialized = true;
config->ena_gpio_flags = gpio_flag;
} else {
config->ena_gpio = -EINVAL;
config->ena_gpio_initialized = false;
}
}
#ifdef CONFIG_OF
static struct of_regulator_match tps65090_matches[] = {
{ .name = "dcdc1", },
{ .name = "dcdc2", },
{ .name = "dcdc3", },
{ .name = "fet1", },
{ .name = "fet2", },
{ .name = "fet3", },
{ .name = "fet4", },
{ .name = "fet5", },
{ .name = "fet6", },
{ .name = "fet7", },
{ .name = "ldo1", },
{ .name = "ldo2", },
};
static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
struct platform_device *pdev,
struct of_regulator_match **tps65090_reg_matches)
{
struct tps65090_platform_data *tps65090_pdata;
struct device_node *np = pdev->dev.parent->of_node;
struct device_node *regulators;
int idx = 0, ret;
struct tps65090_regulator_plat_data *reg_pdata;
tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
GFP_KERNEL);
if (!tps65090_pdata)
return ERR_PTR(-ENOMEM);
reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
sizeof(*reg_pdata), GFP_KERNEL);
if (!reg_pdata)
return ERR_PTR(-ENOMEM);
regulators = of_get_child_by_name(np, "regulators");
if (!regulators) {
dev_err(&pdev->dev, "regulator node not found\n");
return ERR_PTR(-ENODEV);
}
ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
ARRAY_SIZE(tps65090_matches));
of_node_put(regulators);
if (ret < 0) {
dev_err(&pdev->dev,
"Error parsing regulator init data: %d\n", ret);
return ERR_PTR(ret);
}
*tps65090_reg_matches = tps65090_matches;
for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
struct regulator_init_data *ri_data;
struct tps65090_regulator_plat_data *rpdata;
rpdata = &reg_pdata[idx];
ri_data = tps65090_matches[idx].init_data;
if (!ri_data || !tps65090_matches[idx].of_node)
continue;
rpdata->reg_init_data = ri_data;
rpdata->enable_ext_control = of_property_read_bool(
tps65090_matches[idx].of_node,
"ti,enable-ext-control");
if (rpdata->enable_ext_control)
rpdata->gpio = of_get_named_gpio(np,
"dcdc-ext-control-gpios", 0);
if (of_property_read_u32(tps65090_matches[idx].of_node,
"ti,overcurrent-wait",
&rpdata->overcurrent_wait) == 0)
rpdata->overcurrent_wait_valid = true;
tps65090_pdata->reg_pdata[idx] = rpdata;
}
return tps65090_pdata;
}
#else
static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
struct platform_device *pdev,
struct of_regulator_match **tps65090_reg_matches)
{
*tps65090_reg_matches = NULL;
return NULL;
}
#endif
static int tps65090_regulator_probe(struct platform_device *pdev)
{
struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
struct tps65090_regulator *ri = NULL;
struct regulator_config config = { };
struct regulator_dev *rdev;
struct tps65090_regulator_plat_data *tps_pdata;
struct tps65090_regulator *pmic;
struct tps65090_platform_data *tps65090_pdata;
struct of_regulator_match *tps65090_reg_matches = NULL;
int num;
int ret;
dev_dbg(&pdev->dev, "Probing regulator\n");
tps65090_pdata = dev_get_platdata(pdev->dev.parent);
if (!tps65090_pdata && tps65090_mfd->dev->of_node)
tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
&tps65090_reg_matches);
if (IS_ERR_OR_NULL(tps65090_pdata)) {
dev_err(&pdev->dev, "Platform data missing\n");
return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
}
pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
GFP_KERNEL);
if (!pmic)
return -ENOMEM;
for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
tps_pdata = tps65090_pdata->reg_pdata[num];
ri = &pmic[num];
ri->dev = &pdev->dev;
ri->desc = &tps65090_regulator_desc[num];
if (tps_pdata) {
ri->overcurrent_wait_valid =
tps_pdata->overcurrent_wait_valid;
ri->overcurrent_wait = tps_pdata->overcurrent_wait;
}
/*
* TPS5090 DCDC support the control from external digital input.
* Configure it as per platform data.
*/
if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
if (tps_pdata->enable_ext_control) {
tps65090_configure_regulator_config(
tps_pdata, &config);
ri->desc->ops = &tps65090_ext_control_ops;
} else {
ret = tps65090_regulator_disable_ext_control(
ri, tps_pdata);
if (ret < 0) {
dev_err(&pdev->dev,
"failed disable ext control\n");
return ret;
}
}
}
config.dev = pdev->dev.parent;
config.driver_data = ri;
config.regmap = tps65090_mfd->rmap;
if (tps_pdata)
config.init_data = tps_pdata->reg_init_data;
else
config.init_data = NULL;
if (tps65090_reg_matches)
config.of_node = tps65090_reg_matches[num].of_node;
else
config.of_node = NULL;
rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc->name);
return PTR_ERR(rdev);
}
ri->rdev = rdev;
if (ri->overcurrent_wait_valid) {
ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
if (ret < 0)
return ret;
}
/* Enable external control if it is require */
if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
tps_pdata->enable_ext_control) {
ret = tps65090_config_ext_control(ri, true);
if (ret < 0)
return ret;
}
}
platform_set_drvdata(pdev, pmic);
return 0;
}
static struct platform_driver tps65090_regulator_driver = {
.driver = {
.name = "tps65090-pmic",
},
.probe = tps65090_regulator_probe,
};
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");
MODULE_ALIAS("platform:tps65090-pmic");