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remarkable-linux/drivers/regulator/max8660.c
Thomas Gleixner 873e65bc09 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation version 2 of the license 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 you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation inc 59 temple place suite 330 boston ma 02111
  1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 83 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.021731668@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:39 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* max8660.c -- Voltage regulation for the Maxim 8660/8661
*
* based on max1586.c and wm8400-regulator.c
*
* Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
*
* Some info:
*
* Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
*
* This chip is a bit nasty because it is a write-only device. Thus, the driver
* uses shadow registers to keep track of its values. The main problem appears
* to be the initialization: When Linux boots up, we cannot know if the chip is
* in the default state or not, so we would have to pass such information in
* platform_data. As this adds a bit of complexity to the driver, this is left
* out for now until it is really needed.
*
* [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.
*
* If the driver is feature complete, it might be worth to check if one set of
* functions for V3-V7 is sufficient. For maximum flexibility during
* development, they are separated for now.
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max8660.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#define MAX8660_DCDC_MIN_UV 725000
#define MAX8660_DCDC_MAX_UV 1800000
#define MAX8660_DCDC_STEP 25000
#define MAX8660_DCDC_MAX_SEL 0x2b
#define MAX8660_LDO5_MIN_UV 1700000
#define MAX8660_LDO5_MAX_UV 2000000
#define MAX8660_LDO5_STEP 25000
#define MAX8660_LDO5_MAX_SEL 0x0c
#define MAX8660_LDO67_MIN_UV 1800000
#define MAX8660_LDO67_MAX_UV 3300000
#define MAX8660_LDO67_STEP 100000
#define MAX8660_LDO67_MAX_SEL 0x0f
enum {
MAX8660_OVER1,
MAX8660_OVER2,
MAX8660_VCC1,
MAX8660_ADTV1,
MAX8660_ADTV2,
MAX8660_SDTV1,
MAX8660_SDTV2,
MAX8660_MDTV1,
MAX8660_MDTV2,
MAX8660_L12VCR,
MAX8660_FPWM,
MAX8660_N_REGS, /* not a real register */
};
struct max8660 {
struct i2c_client *client;
u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
};
static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
{
static const u8 max8660_addresses[MAX8660_N_REGS] = {
0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
};
int ret;
u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;
dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
max8660_addresses[reg], reg_val);
ret = i2c_smbus_write_byte_data(max8660->client,
max8660_addresses[reg], reg_val);
if (ret == 0)
max8660->shadow_regs[reg] = reg_val;
return ret;
}
/*
* DCDC functions
*/
static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 val = max8660->shadow_regs[MAX8660_OVER1];
u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
return !!(val & mask);
}
static int max8660_dcdc_enable(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
}
static int max8660_dcdc_disable(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
return max8660_write(max8660, MAX8660_OVER1, mask, 0);
}
static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
u8 selector = max8660->shadow_regs[reg];
return selector;
}
static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 reg, bits;
int ret;
reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
ret = max8660_write(max8660, reg, 0, selector);
if (ret)
return ret;
/* Select target voltage register and activate regulation */
bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
}
static struct regulator_ops max8660_dcdc_ops = {
.is_enabled = max8660_dcdc_is_enabled,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.set_voltage_sel = max8660_dcdc_set_voltage_sel,
.get_voltage_sel = max8660_dcdc_get_voltage_sel,
};
/*
* LDO5 functions
*/
static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
return selector;
}
static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
int ret;
ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
if (ret)
return ret;
/* Select target voltage register and activate regulation */
return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
}
static const struct regulator_ops max8660_ldo5_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.set_voltage_sel = max8660_ldo5_set_voltage_sel,
.get_voltage_sel = max8660_ldo5_get_voltage_sel,
};
/*
* LDO67 functions
*/
static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 val = max8660->shadow_regs[MAX8660_OVER2];
u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
return !!(val & mask);
}
static int max8660_ldo67_enable(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
}
static int max8660_ldo67_disable(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
return max8660_write(max8660, MAX8660_OVER2, mask, 0);
}
static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
return selector;
}
static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
if (rdev_get_id(rdev) == MAX8660_V6)
return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
else
return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
selector << 4);
}
static const struct regulator_ops max8660_ldo67_ops = {
.is_enabled = max8660_ldo67_is_enabled,
.enable = max8660_ldo67_enable,
.disable = max8660_ldo67_disable,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = max8660_ldo67_get_voltage_sel,
.set_voltage_sel = max8660_ldo67_set_voltage_sel,
};
static const struct regulator_desc max8660_reg[] = {
{
.name = "V3(DCDC)",
.id = MAX8660_V3,
.ops = &max8660_dcdc_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
.owner = THIS_MODULE,
.min_uV = MAX8660_DCDC_MIN_UV,
.uV_step = MAX8660_DCDC_STEP,
},
{
.name = "V4(DCDC)",
.id = MAX8660_V4,
.ops = &max8660_dcdc_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
.owner = THIS_MODULE,
.min_uV = MAX8660_DCDC_MIN_UV,
.uV_step = MAX8660_DCDC_STEP,
},
{
.name = "V5(LDO)",
.id = MAX8660_V5,
.ops = &max8660_ldo5_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
.owner = THIS_MODULE,
.min_uV = MAX8660_LDO5_MIN_UV,
.uV_step = MAX8660_LDO5_STEP,
},
{
.name = "V6(LDO)",
.id = MAX8660_V6,
.ops = &max8660_ldo67_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
.owner = THIS_MODULE,
.min_uV = MAX8660_LDO67_MIN_UV,
.uV_step = MAX8660_LDO67_STEP,
},
{
.name = "V7(LDO)",
.id = MAX8660_V7,
.ops = &max8660_ldo67_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
.owner = THIS_MODULE,
.min_uV = MAX8660_LDO67_MIN_UV,
.uV_step = MAX8660_LDO67_STEP,
},
};
enum {
MAX8660 = 0,
MAX8661 = 1,
};
#ifdef CONFIG_OF
static const struct of_device_id max8660_dt_ids[] = {
{ .compatible = "maxim,max8660", .data = (void *) MAX8660 },
{ .compatible = "maxim,max8661", .data = (void *) MAX8661 },
{ }
};
MODULE_DEVICE_TABLE(of, max8660_dt_ids);
static int max8660_pdata_from_dt(struct device *dev,
struct device_node **of_node,
struct max8660_platform_data *pdata)
{
int matched, i;
struct device_node *np;
struct max8660_subdev_data *sub;
struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };
np = of_get_child_by_name(dev->of_node, "regulators");
if (!np) {
dev_err(dev, "missing 'regulators' subnode in DT\n");
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(rmatch); i++)
rmatch[i].name = max8660_reg[i].name;
matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
of_node_put(np);
if (matched <= 0)
return matched;
pdata->subdevs = devm_kcalloc(dev,
matched,
sizeof(struct max8660_subdev_data),
GFP_KERNEL);
if (!pdata->subdevs)
return -ENOMEM;
pdata->num_subdevs = matched;
sub = pdata->subdevs;
for (i = 0; i < matched; i++) {
sub->id = i;
sub->name = rmatch[i].name;
sub->platform_data = rmatch[i].init_data;
of_node[i] = rmatch[i].of_node;
sub++;
}
return 0;
}
#else
static inline int max8660_pdata_from_dt(struct device *dev,
struct device_node **of_node,
struct max8660_platform_data *pdata)
{
return 0;
}
#endif
static int max8660_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
struct device *dev = &client->dev;
struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
struct regulator_config config = { };
struct max8660 *max8660;
int boot_on, i, id, ret = -EINVAL;
struct device_node *of_node[MAX8660_V_END];
unsigned long type;
if (dev->of_node && !pdata) {
const struct of_device_id *id;
id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
if (!id)
return -ENODEV;
ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
if (ret < 0)
return ret;
pdata = &pdata_of;
type = (unsigned long) id->data;
} else {
type = i2c_id->driver_data;
memset(of_node, 0, sizeof(of_node));
}
if (pdata->num_subdevs > MAX8660_V_END) {
dev_err(dev, "Too many regulators found!\n");
return -EINVAL;
}
max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
if (!max8660)
return -ENOMEM;
max8660->client = client;
if (pdata->en34_is_high) {
/* Simulate always on */
max8660->shadow_regs[MAX8660_OVER1] = 5;
} else {
/* Otherwise devices can be toggled via software */
max8660_dcdc_ops.enable = max8660_dcdc_enable;
max8660_dcdc_ops.disable = max8660_dcdc_disable;
}
/*
* First, set up shadow registers to prevent glitches. As some
* registers are shared between regulators, everything must be properly
* set up for all regulators in advance.
*/
max8660->shadow_regs[MAX8660_ADTV1] =
max8660->shadow_regs[MAX8660_ADTV2] =
max8660->shadow_regs[MAX8660_SDTV1] =
max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
max8660->shadow_regs[MAX8660_MDTV1] =
max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
for (i = 0; i < pdata->num_subdevs; i++) {
if (!pdata->subdevs[i].platform_data)
boot_on = false;
else
boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
switch (pdata->subdevs[i].id) {
case MAX8660_V3:
if (boot_on)
max8660->shadow_regs[MAX8660_OVER1] |= 1;
break;
case MAX8660_V4:
if (boot_on)
max8660->shadow_regs[MAX8660_OVER1] |= 4;
break;
case MAX8660_V5:
break;
case MAX8660_V6:
if (boot_on)
max8660->shadow_regs[MAX8660_OVER2] |= 2;
break;
case MAX8660_V7:
if (type == MAX8661) {
dev_err(dev, "Regulator not on this chip!\n");
return -EINVAL;
}
if (boot_on)
max8660->shadow_regs[MAX8660_OVER2] |= 4;
break;
default:
dev_err(dev, "invalid regulator %s\n",
pdata->subdevs[i].name);
return ret;
}
}
/* Finally register devices */
for (i = 0; i < pdata->num_subdevs; i++) {
struct regulator_dev *rdev;
id = pdata->subdevs[i].id;
config.dev = dev;
config.init_data = pdata->subdevs[i].platform_data;
config.of_node = of_node[i];
config.driver_data = max8660;
rdev = devm_regulator_register(&client->dev,
&max8660_reg[id], &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(&client->dev, "failed to register %s\n",
max8660_reg[id].name);
return PTR_ERR(rdev);
}
}
i2c_set_clientdata(client, max8660);
return 0;
}
static const struct i2c_device_id max8660_id[] = {
{ .name = "max8660", .driver_data = MAX8660 },
{ .name = "max8661", .driver_data = MAX8661 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8660_id);
static struct i2c_driver max8660_driver = {
.probe = max8660_probe,
.driver = {
.name = "max8660",
},
.id_table = max8660_id,
};
static int __init max8660_init(void)
{
return i2c_add_driver(&max8660_driver);
}
subsys_initcall(max8660_init);
static void __exit max8660_exit(void)
{
i2c_del_driver(&max8660_driver);
}
module_exit(max8660_exit);
/* Module information */
MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
MODULE_AUTHOR("Wolfram Sang");
MODULE_LICENSE("GPL v2");
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