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linux/drivers/mfd/rc5t583.c
Markus Elfring d001117474 mfd: rc5t583: Improve a size determination 
Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-05-16 09:21:48 +01:00

327 lines
8.3 KiB
C
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/*
* Core driver access RC5T583 power management chip.
*
* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
* Author: Laxman dewangan <ldewangan@nvidia.com>
*
* Based on code
* Copyright (C) 2011 RICOH COMPANY,LTD
*
* 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/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rc5t583.h>
#include <linux/regmap.h>
#define RICOH_ONOFFSEL_REG 0x10
#define RICOH_SWCTL_REG 0x5E
struct deepsleep_control_data {
u8 reg_add;
u8 ds_pos_bit;
};
#define DEEPSLEEP_INIT(_id, _reg, _pos) \
{ \
.reg_add = RC5T583_##_reg, \
.ds_pos_bit = _pos, \
}
static struct deepsleep_control_data deepsleep_data[] = {
DEEPSLEEP_INIT(DC0, SLPSEQ1, 0),
DEEPSLEEP_INIT(DC1, SLPSEQ1, 4),
DEEPSLEEP_INIT(DC2, SLPSEQ2, 0),
DEEPSLEEP_INIT(DC3, SLPSEQ2, 4),
DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0),
DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4),
DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0),
DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4),
DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0),
DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4),
DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0),
DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4),
DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0),
DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4),
DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0),
DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4),
DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0),
DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4),
DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0),
DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4),
DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0),
DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4),
};
#define EXT_PWR_REQ \
(RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL)
static const struct mfd_cell rc5t583_subdevs[] = {
{.name = "rc5t583-gpio",},
{.name = "rc5t583-regulator",},
{.name = "rc5t583-rtc", },
{.name = "rc5t583-key", }
};
static int __rc5t583_set_ext_pwrreq1_control(struct device *dev,
int id, int ext_pwr, int slots)
{
int ret;
uint8_t sleepseq_val = 0;
unsigned int en_bit;
unsigned int slot_bit;
if (id == RC5T583_DS_DC0) {
dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id);
return -EINVAL;
}
en_bit = deepsleep_data[id].ds_pos_bit;
slot_bit = en_bit + 1;
ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val);
if (ret < 0) {
dev_err(dev, "Error in reading reg 0x%x\n",
deepsleep_data[id].reg_add);
return ret;
}
sleepseq_val &= ~(0xF << en_bit);
sleepseq_val |= BIT(en_bit);
sleepseq_val |= ((slots & 0x7) << slot_bit);
ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1));
if (ret < 0) {
dev_err(dev, "Error in updating the 0x%02x register\n",
RICOH_ONOFFSEL_REG);
return ret;
}
ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val);
if (ret < 0) {
dev_err(dev, "Error in writing reg 0x%x\n",
deepsleep_data[id].reg_add);
return ret;
}
if (id == RC5T583_DS_LDO4) {
ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1);
if (ret < 0)
dev_err(dev, "Error in writing reg 0x%x\n",
RICOH_SWCTL_REG);
}
return ret;
}
static int __rc5t583_set_ext_pwrreq2_control(struct device *dev,
int id, int ext_pwr)
{
int ret;
if (id != RC5T583_DS_DC0) {
dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id);
return -EINVAL;
}
ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2));
if (ret < 0)
dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n");
return ret;
}
int rc5t583_ext_power_req_config(struct device *dev, int ds_id,
int ext_pwr_req, int deepsleep_slot_nr)
{
if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ)
return -EINVAL;
if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL)
return __rc5t583_set_ext_pwrreq1_control(dev, ds_id,
ext_pwr_req, deepsleep_slot_nr);
if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL)
return __rc5t583_set_ext_pwrreq2_control(dev,
ds_id, ext_pwr_req);
return 0;
}
EXPORT_SYMBOL(rc5t583_ext_power_req_config);
static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583,
struct rc5t583_platform_data *pdata)
{
int ret;
int i;
uint8_t on_off_val = 0;
/* Clear ONOFFSEL register */
if (pdata->enable_shutdown)
on_off_val = 0x1;
ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val);
if (ret < 0)
dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
RICOH_ONOFFSEL_REG, ret);
ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0);
if (ret < 0)
dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
RICOH_SWCTL_REG, ret);
/* Clear sleep sequence register */
for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) {
ret = rc5t583_write(rc5t583->dev, i, 0x0);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
i, ret);
}
return 0;
}
static bool volatile_reg(struct device *dev, unsigned int reg)
{
/* Enable caching in interrupt registers */
switch (reg) {
case RC5T583_INT_EN_SYS1:
case RC5T583_INT_EN_SYS2:
case RC5T583_INT_EN_DCDC:
case RC5T583_INT_EN_RTC:
case RC5T583_INT_EN_ADC1:
case RC5T583_INT_EN_ADC2:
case RC5T583_INT_EN_ADC3:
case RC5T583_GPIO_GPEDGE1:
case RC5T583_GPIO_GPEDGE2:
case RC5T583_GPIO_EN_INT:
return false;
case RC5T583_GPIO_MON_IOIN:
/* This is gpio input register */
return true;
default:
/* Enable caching in gpio registers */
if ((reg >= RC5T583_GPIO_IOSEL) &&
(reg <= RC5T583_GPIO_GPOFUNC))
return false;
/* Enable caching in sleep seq registers */
if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11))
return false;
/* Enable caching of regulator registers */
if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL))
return false;
if ((reg >= RC5T583_REG_LDOEN1) &&
(reg <= RC5T583_REG_LDO9DAC_DS))
return false;
break;
}
return true;
}
static const struct regmap_config rc5t583_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = volatile_reg,
.max_register = RC5T583_MAX_REG,
.num_reg_defaults_raw = RC5T583_NUM_REGS,
.cache_type = REGCACHE_RBTREE,
};
static int rc5t583_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct rc5t583 *rc5t583;
struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev);
int ret;
if (!pdata) {
dev_err(&i2c->dev, "Err: Platform data not found\n");
return -EINVAL;
}
rc5t583 = devm_kzalloc(&i2c->dev, sizeof(*rc5t583), GFP_KERNEL);
if (!rc5t583)
return -ENOMEM;
rc5t583->dev = &i2c->dev;
i2c_set_clientdata(i2c, rc5t583);
rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config);
if (IS_ERR(rc5t583->regmap)) {
ret = PTR_ERR(rc5t583->regmap);
dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
return ret;
}
ret = rc5t583_clear_ext_power_req(rc5t583, pdata);
if (ret < 0)
return ret;
if (i2c->irq) {
ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
/* Still continue with warning, if irq init fails */
if (ret)
dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
}
ret = devm_mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL);
if (ret) {
dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
return ret;
}
return 0;
}
static const struct i2c_device_id rc5t583_i2c_id[] = {
{.name = "rc5t583", .driver_data = 0},
{}
};
MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);
static struct i2c_driver rc5t583_i2c_driver = {
.driver = {
.name = "rc5t583",
},
.probe = rc5t583_i2c_probe,
.id_table = rc5t583_i2c_id,
};
static int __init rc5t583_i2c_init(void)
{
return i2c_add_driver(&rc5t583_i2c_driver);
}
subsys_initcall(rc5t583_i2c_init);
static void __exit rc5t583_i2c_exit(void)
{
i2c_del_driver(&rc5t583_i2c_driver);
}
module_exit(rc5t583_i2c_exit);
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
MODULE_LICENSE("GPL v2");
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