linux/drivers/regulator/lp8755.c
Uwe Kleine-König ed5c2f5fd1 i2c: Make remove callback return void
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00

467 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* LP8755 High Performance Power Management Unit : System Interface Driver
* (based on rev. 0.26)
* Copyright 2012 Texas Instruments
*
* Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/regmap.h>
#include <linux/uaccess.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/platform_data/lp8755.h>
#define LP8755_REG_BUCK0 0x00
#define LP8755_REG_BUCK1 0x03
#define LP8755_REG_BUCK2 0x04
#define LP8755_REG_BUCK3 0x01
#define LP8755_REG_BUCK4 0x05
#define LP8755_REG_BUCK5 0x02
#define LP8755_REG_MAX 0xFF
#define LP8755_BUCK_EN_M BIT(7)
#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
#define LP8755_BUCK_VOUT_M 0x7F
struct lp8755_mphase {
int nreg;
int buck_num[LP8755_BUCK_MAX];
};
struct lp8755_chip {
struct device *dev;
struct regmap *regmap;
struct lp8755_platform_data *pdata;
int irq;
unsigned int irqmask;
int mphase;
struct regulator_dev *rdev[LP8755_BUCK_MAX];
};
static int lp8755_buck_enable_time(struct regulator_dev *rdev)
{
int ret;
unsigned int regval;
enum lp8755_bucks id = rdev_get_id(rdev);
ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
if (ret < 0) {
dev_err(&rdev->dev, "i2c access error %s\n", __func__);
return ret;
}
return (regval & 0xff) * 100;
}
static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
int ret;
unsigned int regbval = 0x0;
enum lp8755_bucks id = rdev_get_id(rdev);
struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
/* forced pwm mode */
regbval = (0x01 << id);
break;
case REGULATOR_MODE_NORMAL:
/* enable automatic pwm/pfm mode */
ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
if (ret < 0)
goto err_i2c;
break;
case REGULATOR_MODE_IDLE:
/* enable automatic pwm/pfm/lppfm mode */
ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
if (ret < 0)
goto err_i2c;
ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
if (ret < 0)
goto err_i2c;
break;
default:
dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
/* forced pwm mode */
regbval = (0x01 << id);
}
ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
if (ret < 0)
goto err_i2c;
return ret;
err_i2c:
dev_err(&rdev->dev, "i2c access error %s\n", __func__);
return ret;
}
static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
{
int ret;
unsigned int regval;
enum lp8755_bucks id = rdev_get_id(rdev);
ret = regmap_read(rdev->regmap, 0x06, &regval);
if (ret < 0)
goto err_i2c;
/* mode fast means forced pwm mode */
if (regval & (0x01 << id))
return REGULATOR_MODE_FAST;
ret = regmap_read(rdev->regmap, 0x08 + id, &regval);
if (ret < 0)
goto err_i2c;
/* mode idle means automatic pwm/pfm/lppfm mode */
if (regval & 0x20)
return REGULATOR_MODE_IDLE;
/* mode normal means automatic pwm/pfm mode */
return REGULATOR_MODE_NORMAL;
err_i2c:
dev_err(&rdev->dev, "i2c access error %s\n", __func__);
return 0;
}
static const unsigned int lp8755_buck_ramp_table[] = {
30000, 15000, 7500, 3800, 1900, 940, 470, 230
};
static const struct regulator_ops lp8755_buck_ops = {
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = lp8755_buck_enable_time,
.set_mode = lp8755_buck_set_mode,
.get_mode = lp8755_buck_get_mode,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
};
#define lp8755_rail(_id) "lp8755_buck"#_id
#define lp8755_buck_init(_id)\
{\
.constraints = {\
.name = lp8755_rail(_id),\
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
.min_uV = 500000,\
.max_uV = 1675000,\
},\
}
static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
[LP8755_BUCK0] = lp8755_buck_init(0),
[LP8755_BUCK1] = lp8755_buck_init(1),
[LP8755_BUCK2] = lp8755_buck_init(2),
[LP8755_BUCK3] = lp8755_buck_init(3),
[LP8755_BUCK4] = lp8755_buck_init(4),
[LP8755_BUCK5] = lp8755_buck_init(5),
};
static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
LP8755_BUCK4, LP8755_BUCK5 } },
{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
LP8755_BUCK5} },
{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
{ 1, { LP8755_BUCK0} },
{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
};
static int lp8755_init_data(struct lp8755_chip *pchip)
{
unsigned int regval;
int ret, icnt, buck_num;
struct lp8755_platform_data *pdata = pchip->pdata;
/* read back muti-phase configuration */
ret = regmap_read(pchip->regmap, 0x3D, &regval);
if (ret < 0)
goto out_i2c_error;
pchip->mphase = regval & 0x0F;
/* set default data based on multi-phase config */
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
}
return ret;
out_i2c_error:
dev_err(pchip->dev, "i2c access error %s\n", __func__);
return ret;
}
#define lp8755_buck_desc(_id)\
{\
.name = lp8755_rail(_id),\
.id = LP8755_BUCK##_id,\
.ops = &lp8755_buck_ops,\
.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
.uV_step = 10000,\
.min_uV = 500000,\
.type = REGULATOR_VOLTAGE,\
.owner = THIS_MODULE,\
.enable_reg = LP8755_REG_BUCK##_id,\
.enable_mask = LP8755_BUCK_EN_M,\
.vsel_reg = LP8755_REG_BUCK##_id,\
.vsel_mask = LP8755_BUCK_VOUT_M,\
.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
.ramp_mask = 0x7,\
.ramp_delay_table = lp8755_buck_ramp_table,\
.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
}
static const struct regulator_desc lp8755_regulators[] = {
lp8755_buck_desc(0),
lp8755_buck_desc(1),
lp8755_buck_desc(2),
lp8755_buck_desc(3),
lp8755_buck_desc(4),
lp8755_buck_desc(5),
};
static int lp8755_regulator_init(struct lp8755_chip *pchip)
{
int ret, icnt, buck_num;
struct lp8755_platform_data *pdata = pchip->pdata;
struct regulator_config rconfig = { };
rconfig.regmap = pchip->regmap;
rconfig.dev = pchip->dev;
rconfig.driver_data = pchip;
for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
rconfig.init_data = pdata->buck_data[buck_num];
rconfig.of_node = pchip->dev->of_node;
pchip->rdev[buck_num] =
devm_regulator_register(pchip->dev,
&lp8755_regulators[buck_num], &rconfig);
if (IS_ERR(pchip->rdev[buck_num])) {
ret = PTR_ERR(pchip->rdev[buck_num]);
pchip->rdev[buck_num] = NULL;
dev_err(pchip->dev, "regulator init failed: buck %d\n",
buck_num);
return ret;
}
}
return 0;
}
static irqreturn_t lp8755_irq_handler(int irq, void *data)
{
int ret, icnt;
unsigned int flag0, flag1;
struct lp8755_chip *pchip = data;
/* read flag0 register */
ret = regmap_read(pchip->regmap, 0x0D, &flag0);
if (ret < 0)
goto err_i2c;
/* clear flag register to pull up int. pin */
ret = regmap_write(pchip->regmap, 0x0D, 0x00);
if (ret < 0)
goto err_i2c;
/* sent power fault detection event to specific regulator */
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if ((flag0 & (0x4 << icnt))
&& (pchip->irqmask & (0x04 << icnt))
&& (pchip->rdev[icnt] != NULL)) {
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_PWR_FAULT,
NULL);
}
/* read flag1 register */
ret = regmap_read(pchip->regmap, 0x0E, &flag1);
if (ret < 0)
goto err_i2c;
/* clear flag register to pull up int. pin */
ret = regmap_write(pchip->regmap, 0x0E, 0x00);
if (ret < 0)
goto err_i2c;
/* send OCP event to all regulator devices */
if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL) {
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OCP,
NULL);
}
/* send OVP event to all regulator devices */
if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL) {
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OVP,
NULL);
}
return IRQ_HANDLED;
err_i2c:
dev_err(pchip->dev, "i2c access error %s\n", __func__);
return IRQ_NONE;
}
static int lp8755_int_config(struct lp8755_chip *pchip)
{
int ret;
unsigned int regval;
if (pchip->irq == 0) {
dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
return 0;
}
ret = regmap_read(pchip->regmap, 0x0F, &regval);
if (ret < 0) {
dev_err(pchip->dev, "i2c access error %s\n", __func__);
return ret;
}
pchip->irqmask = regval;
return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
lp8755_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"lp8755-irq", pchip);
}
static const struct regmap_config lp8755_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP8755_REG_MAX,
};
static int lp8755_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret, icnt;
struct lp8755_chip *pchip;
struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "i2c functionality check fail.\n");
return -EOPNOTSUPP;
}
pchip = devm_kzalloc(&client->dev,
sizeof(struct lp8755_chip), GFP_KERNEL);
if (!pchip)
return -ENOMEM;
pchip->dev = &client->dev;
pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
if (IS_ERR(pchip->regmap)) {
ret = PTR_ERR(pchip->regmap);
dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
return ret;
}
i2c_set_clientdata(client, pchip);
if (pdata != NULL) {
pchip->pdata = pdata;
pchip->mphase = pdata->mphase;
} else {
pchip->pdata = devm_kzalloc(pchip->dev,
sizeof(struct lp8755_platform_data),
GFP_KERNEL);
if (!pchip->pdata)
return -ENOMEM;
ret = lp8755_init_data(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to initialize chip\n");
return ret;
}
}
ret = lp8755_regulator_init(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to initialize regulators\n");
goto err;
}
pchip->irq = client->irq;
ret = lp8755_int_config(pchip);
if (ret < 0) {
dev_err(&client->dev, "fail to irq config\n");
goto err;
}
return ret;
err:
/* output disable */
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
regmap_write(pchip->regmap, icnt, 0x00);
return ret;
}
static void lp8755_remove(struct i2c_client *client)
{
int icnt;
struct lp8755_chip *pchip = i2c_get_clientdata(client);
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
regmap_write(pchip->regmap, icnt, 0x00);
}
static const struct i2c_device_id lp8755_id[] = {
{LP8755_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lp8755_id);
static struct i2c_driver lp8755_i2c_driver = {
.driver = {
.name = LP8755_NAME,
},
.probe = lp8755_probe,
.remove = lp8755_remove,
.id_table = lp8755_id,
};
static int __init lp8755_init(void)
{
return i2c_add_driver(&lp8755_i2c_driver);
}
subsys_initcall(lp8755_init);
static void __exit lp8755_exit(void)
{
i2c_del_driver(&lp8755_i2c_driver);
}
module_exit(lp8755_exit);
MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_LICENSE("GPL v2");