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linux/drivers/regulator/max8660.c
Wolfram Sang fbae3fb154 i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 
I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d to fix the faulty drivers.

As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2010-06-03 11:33:58 +02:00

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/*
* 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.
*
* 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
*
* 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>
#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 */
struct regulator_dev *rdev[];
};
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_list(struct regulator_dev *rdev, unsigned selector)
{
if (selector > MAX8660_DCDC_MAX_SEL)
return -EINVAL;
return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
}
static int max8660_dcdc_get(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 MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
}
static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 reg, selector, bits;
int ret;
if (min_uV < MAX8660_DCDC_MIN_UV || min_uV > MAX8660_DCDC_MAX_UV)
return -EINVAL;
if (max_uV < MAX8660_DCDC_MIN_UV || max_uV > MAX8660_DCDC_MAX_UV)
return -EINVAL;
selector = (min_uV - (MAX8660_DCDC_MIN_UV - MAX8660_DCDC_STEP + 1))
/ MAX8660_DCDC_STEP;
ret = max8660_dcdc_list(rdev, selector);
if (ret < 0 || ret > max_uV)
return -EINVAL;
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 = max8660_dcdc_list,
.set_voltage = max8660_dcdc_set,
.get_voltage = max8660_dcdc_get,
};
/*
* LDO5 functions
*/
static int max8660_ldo5_list(struct regulator_dev *rdev, unsigned selector)
{
if (selector > MAX8660_LDO5_MAX_SEL)
return -EINVAL;
return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
}
static int max8660_ldo5_get(struct regulator_dev *rdev)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
}
static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 selector;
int ret;
if (min_uV < MAX8660_LDO5_MIN_UV || min_uV > MAX8660_LDO5_MAX_UV)
return -EINVAL;
if (max_uV < MAX8660_LDO5_MIN_UV || max_uV > MAX8660_LDO5_MAX_UV)
return -EINVAL;
selector = (min_uV - (MAX8660_LDO5_MIN_UV - MAX8660_LDO5_STEP + 1))
/ MAX8660_LDO5_STEP;
ret = max8660_ldo5_list(rdev, selector);
if (ret < 0 || ret > max_uV)
return -EINVAL;
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 struct regulator_ops max8660_ldo5_ops = {
.list_voltage = max8660_ldo5_list,
.set_voltage = max8660_ldo5_set,
.get_voltage = max8660_ldo5_get,
};
/*
* 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_list(struct regulator_dev *rdev, unsigned selector)
{
if (selector > MAX8660_LDO67_MAX_SEL)
return -EINVAL;
return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
}
static int max8660_ldo67_get(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 MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
}
static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV, int max_uV)
{
struct max8660 *max8660 = rdev_get_drvdata(rdev);
u8 selector;
int ret;
if (min_uV < MAX8660_LDO67_MIN_UV || min_uV > MAX8660_LDO67_MAX_UV)
return -EINVAL;
if (max_uV < MAX8660_LDO67_MIN_UV || max_uV > MAX8660_LDO67_MAX_UV)
return -EINVAL;
selector = (min_uV - (MAX8660_LDO67_MIN_UV - MAX8660_LDO67_STEP + 1))
/ MAX8660_LDO67_STEP;
ret = max8660_ldo67_list(rdev, selector);
if (ret < 0 || ret > max_uV)
return -EINVAL;
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 struct regulator_ops max8660_ldo67_ops = {
.is_enabled = max8660_ldo67_is_enabled,
.enable = max8660_ldo67_enable,
.disable = max8660_ldo67_disable,
.list_voltage = max8660_ldo67_list,
.get_voltage = max8660_ldo67_get,
.set_voltage = max8660_ldo67_set,
};
static 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,
},
{
.name = "V4(DCDC)",
.id = MAX8660_V4,
.ops = &max8660_dcdc_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_DCDC_MAX_SEL + 1,
.owner = THIS_MODULE,
},
{
.name = "V5(LDO)",
.id = MAX8660_V5,
.ops = &max8660_ldo5_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO5_MAX_SEL + 1,
.owner = THIS_MODULE,
},
{
.name = "V6(LDO)",
.id = MAX8660_V6,
.ops = &max8660_ldo67_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
.owner = THIS_MODULE,
},
{
.name = "V7(LDO)",
.id = MAX8660_V7,
.ops = &max8660_ldo67_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = MAX8660_LDO67_MAX_SEL + 1,
.owner = THIS_MODULE,
},
};
static int __devinit max8660_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
struct regulator_dev **rdev;
struct max8660_platform_data *pdata = client->dev.platform_data;
struct max8660 *max8660;
int boot_on, i, id, ret = -EINVAL;
if (pdata->num_subdevs > MAX8660_V_END) {
dev_err(&client->dev, "Too many regulators found!\n");
goto out;
}
max8660 = kzalloc(sizeof(struct max8660) +
sizeof(struct regulator_dev *) * MAX8660_V_END,
GFP_KERNEL);
if (!max8660) {
ret = -ENOMEM;
goto out;
}
max8660->client = client;
rdev = max8660->rdev;
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)
goto err_free;
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 (!strcmp(i2c_id->name, "max8661")) {
dev_err(&client->dev, "Regulator not on this chip!\n");
goto err_free;
}
if (boot_on)
max8660->shadow_regs[MAX8660_OVER2] |= 4;
break;
default:
dev_err(&client->dev, "invalid regulator %s\n",
pdata->subdevs[i].name);
goto err_free;
}
}
/* Finally register devices */
for (i = 0; i < pdata->num_subdevs; i++) {
id = pdata->subdevs[i].id;
rdev[i] = regulator_register(&max8660_reg[id], &client->dev,
pdata->subdevs[i].platform_data,
max8660);
if (IS_ERR(rdev[i])) {
ret = PTR_ERR(rdev[i]);
dev_err(&client->dev, "failed to register %s\n",
max8660_reg[id].name);
goto err_unregister;
}
}
i2c_set_clientdata(client, rdev);
dev_info(&client->dev, "Maxim 8660/8661 regulator driver loaded\n");
return 0;
err_unregister:
while (--i >= 0)
regulator_unregister(rdev[i]);
err_free:
kfree(max8660);
out:
return ret;
}
static int __devexit max8660_remove(struct i2c_client *client)
{
struct regulator_dev **rdev = i2c_get_clientdata(client);
int i;
for (i = 0; i < MAX8660_V_END; i++)
if (rdev[i])
regulator_unregister(rdev[i]);
kfree(rdev);
return 0;
}
static const struct i2c_device_id max8660_id[] = {
{ "max8660", 0 },
{ "max8661", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8660_id);
static struct i2c_driver max8660_driver = {
.probe = max8660_probe,
.remove = __devexit_p(max8660_remove),
.driver = {
.name = "max8660",
.owner = THIS_MODULE,
},
.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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