linux/drivers/regulator/lp3971.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Regulator driver for National Semiconductors LP3971 PMIC chip
*
* Copyright (C) 2009 Samsung Electronics
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
*
* Based on wm8350.c
*/
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/lp3971.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
struct lp3971 {
struct device *dev;
struct mutex io_lock;
struct i2c_client *i2c;
};
static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
#define LP3971_SYS_CONTROL1_REG 0x07
/* System control register 1 initial value,
bits 4 and 5 are EPROM programmable */
#define SYS_CONTROL1_INIT_VAL 0x40
#define SYS_CONTROL1_INIT_MASK 0xCF
#define LP3971_BUCK_VOL_ENABLE_REG 0x10
#define LP3971_BUCK_VOL_CHANGE_REG 0x20
/* Voltage control registers shift:
LP3971_BUCK1 -> 0
LP3971_BUCK2 -> 4
LP3971_BUCK3 -> 6
*/
#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
#define BUCK_VOL_CHANGE_FLAG_GO 0x01
#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
#define LP3971_BUCK1_BASE 0x23
#define LP3971_BUCK2_BASE 0x29
#define LP3971_BUCK3_BASE 0x32
static const int buck_base_addr[] = {
LP3971_BUCK1_BASE,
LP3971_BUCK2_BASE,
LP3971_BUCK3_BASE,
};
#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
static const unsigned int buck_voltage_map[] = {
0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
3000000, 3300000,
};
#define BUCK_TARGET_VOL_MASK 0x3f
#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
#define LP3971_LDO_ENABLE_REG 0x12
#define LP3971_LDO_VOL_CONTR_BASE 0x39
/* Voltage control registers:
LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
*/
#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
/* Voltage control registers shift:
LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
LP3971_LDO5 -> 0
*/
#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
#define LDO_VOL_CONTR_MASK 0x0f
static const unsigned int ldo45_voltage_map[] = {
1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
};
static const unsigned int ldo123_voltage_map[] = {
1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
};
#define LDO_VOL_MIN_IDX 0x00
#define LDO_VOL_MAX_IDX 0x0f
static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3971_LDO1;
u16 mask = 1 << (1 + ldo);
u16 val;
val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
return (val & mask) != 0;
}
static int lp3971_ldo_enable(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3971_LDO1;
u16 mask = 1 << (1 + ldo);
return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
}
static int lp3971_ldo_disable(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3971_LDO1;
u16 mask = 1 << (1 + ldo);
return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
}
static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3971_LDO1;
u16 val, reg;
reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
return val;
}
static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
unsigned int selector)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3971_LDO1;
return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
selector << LDO_VOL_CONTR_SHIFT(ldo));
}
static const struct regulator_ops lp3971_ldo_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.is_enabled = lp3971_ldo_is_enabled,
.enable = lp3971_ldo_enable,
.disable = lp3971_ldo_disable,
.get_voltage_sel = lp3971_ldo_get_voltage_sel,
.set_voltage_sel = lp3971_ldo_set_voltage_sel,
};
static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3971_DCDC1;
u16 mask = 1 << (buck * 2);
u16 val;
val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
return (val & mask) != 0;
}
static int lp3971_dcdc_enable(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3971_DCDC1;
u16 mask = 1 << (buck * 2);
return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
}
static int lp3971_dcdc_disable(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3971_DCDC1;
u16 mask = 1 << (buck * 2);
return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
}
static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3971_DCDC1;
u16 reg;
reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
reg &= BUCK_TARGET_VOL_MASK;
return reg;
}
static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
unsigned int selector)
{
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3971_DCDC1;
int ret;
ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
BUCK_TARGET_VOL_MASK, selector);
if (ret)
return ret;
ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
if (ret)
return ret;
return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
0 << BUCK_VOL_CHANGE_SHIFT(buck));
}
static const struct regulator_ops lp3971_dcdc_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.is_enabled = lp3971_dcdc_is_enabled,
.enable = lp3971_dcdc_enable,
.disable = lp3971_dcdc_disable,
.get_voltage_sel = lp3971_dcdc_get_voltage_sel,
.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
};
static const struct regulator_desc regulators[] = {
{
.name = "LDO1",
.id = LP3971_LDO1,
.ops = &lp3971_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.volt_table = ldo123_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO2",
.id = LP3971_LDO2,
.ops = &lp3971_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.volt_table = ldo123_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO3",
.id = LP3971_LDO3,
.ops = &lp3971_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
.volt_table = ldo123_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO4",
.id = LP3971_LDO4,
.ops = &lp3971_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
.volt_table = ldo45_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO5",
.id = LP3971_LDO5,
.ops = &lp3971_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
.volt_table = ldo45_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC1",
.id = LP3971_DCDC1,
.ops = &lp3971_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck_voltage_map),
.volt_table = buck_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC2",
.id = LP3971_DCDC2,
.ops = &lp3971_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck_voltage_map),
.volt_table = buck_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC3",
.id = LP3971_DCDC3,
.ops = &lp3971_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck_voltage_map),
.volt_table = buck_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
};
static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
u16 *dest)
{
int ret;
if (count != 1)
return -EIO;
ret = i2c_smbus_read_byte_data(i2c, reg);
if (ret < 0)
return ret;
*dest = ret;
return 0;
}
static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
const u16 *src)
{
if (count != 1)
return -EIO;
return i2c_smbus_write_byte_data(i2c, reg, *src);
}
static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
{
u16 val = 0;
mutex_lock(&lp3971->io_lock);
lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
(unsigned)val&0xff);
mutex_unlock(&lp3971->io_lock);
return val & 0xff;
}
static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
{
u16 tmp;
int ret;
mutex_lock(&lp3971->io_lock);
ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
if (ret == 0) {
tmp = (tmp & ~mask) | val;
ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
(unsigned)val&0xff);
}
mutex_unlock(&lp3971->io_lock);
return ret;
}
static int setup_regulators(struct lp3971 *lp3971,
struct lp3971_platform_data *pdata)
{
int i, err;
/* Instantiate the regulators */
for (i = 0; i < pdata->num_regulators; i++) {
struct regulator_config config = { };
struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
struct regulator_dev *rdev;
config.dev = lp3971->dev;
config.init_data = reg->initdata;
config.driver_data = lp3971;
rdev = devm_regulator_register(lp3971->dev,
&regulators[reg->id], &config);
if (IS_ERR(rdev)) {
err = PTR_ERR(rdev);
dev_err(lp3971->dev, "regulator init failed: %d\n",
err);
return err;
}
}
return 0;
}
static int lp3971_i2c_probe(struct i2c_client *i2c)
{
struct lp3971 *lp3971;
struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
int ret;
u16 val;
if (!pdata) {
dev_dbg(&i2c->dev, "No platform init data supplied\n");
return -ENODEV;
}
lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
if (lp3971 == NULL)
return -ENOMEM;
lp3971->i2c = i2c;
lp3971->dev = &i2c->dev;
mutex_init(&lp3971->io_lock);
/* Detect LP3971 */
ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
ret = -ENODEV;
if (ret < 0) {
dev_err(&i2c->dev, "failed to detect device\n");
return ret;
}
ret = setup_regulators(lp3971, pdata);
if (ret < 0)
return ret;
i2c_set_clientdata(i2c, lp3971);
return 0;
}
static const struct i2c_device_id lp3971_i2c_id[] = {
{ "lp3971", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
static struct i2c_driver lp3971_i2c_driver = {
.driver = {
.name = "LP3971",
},
.probe_new = lp3971_i2c_probe,
.id_table = lp3971_i2c_id,
};
module_i2c_driver(lp3971_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
MODULE_DESCRIPTION("LP3971 PMIC driver");