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linux/drivers/mfd/qcom-pm8xxx.c
Uwe Kleine-König 19ea1d3953 mfd: qcom-pm8xxx: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231123165627.492259-14-u.kleine-koenig@pengutronix.de
Signed-off-by: Lee Jones <lee@kernel.org>
2023-12-07 13:50:27 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ssbi.h>
#include <linux/regmap.h>
#include <linux/of_platform.h>
#include <linux/mfd/core.h>
#define SSBI_REG_ADDR_IRQ_BASE 0x1BB
#define SSBI_REG_ADDR_IRQ_ROOT (SSBI_REG_ADDR_IRQ_BASE + 0)
#define SSBI_REG_ADDR_IRQ_M_STATUS1 (SSBI_REG_ADDR_IRQ_BASE + 1)
#define SSBI_REG_ADDR_IRQ_M_STATUS2 (SSBI_REG_ADDR_IRQ_BASE + 2)
#define SSBI_REG_ADDR_IRQ_M_STATUS3 (SSBI_REG_ADDR_IRQ_BASE + 3)
#define SSBI_REG_ADDR_IRQ_M_STATUS4 (SSBI_REG_ADDR_IRQ_BASE + 4)
#define SSBI_REG_ADDR_IRQ_BLK_SEL (SSBI_REG_ADDR_IRQ_BASE + 5)
#define SSBI_REG_ADDR_IRQ_IT_STATUS (SSBI_REG_ADDR_IRQ_BASE + 6)
#define SSBI_REG_ADDR_IRQ_CONFIG (SSBI_REG_ADDR_IRQ_BASE + 7)
#define SSBI_REG_ADDR_IRQ_RT_STATUS (SSBI_REG_ADDR_IRQ_BASE + 8)
#define PM8821_SSBI_REG_ADDR_IRQ_BASE 0x100
#define PM8821_SSBI_REG_ADDR_IRQ_MASTER0 (PM8821_SSBI_REG_ADDR_IRQ_BASE + 0x30)
#define PM8821_SSBI_REG_ADDR_IRQ_MASTER1 (PM8821_SSBI_REG_ADDR_IRQ_BASE + 0xb0)
#define PM8821_SSBI_REG(m, b, offset) \
((m == 0) ? \
(PM8821_SSBI_REG_ADDR_IRQ_MASTER0 + b + offset) : \
(PM8821_SSBI_REG_ADDR_IRQ_MASTER1 + b + offset))
#define PM8821_SSBI_ADDR_IRQ_ROOT(m, b) PM8821_SSBI_REG(m, b, 0x0)
#define PM8821_SSBI_ADDR_IRQ_CLEAR(m, b) PM8821_SSBI_REG(m, b, 0x01)
#define PM8821_SSBI_ADDR_IRQ_MASK(m, b) PM8821_SSBI_REG(m, b, 0x08)
#define PM8821_SSBI_ADDR_IRQ_RT_STATUS(m, b) PM8821_SSBI_REG(m, b, 0x0f)
#define PM8821_BLOCKS_PER_MASTER 7
#define PM_IRQF_LVL_SEL 0x01 /* level select */
#define PM_IRQF_MASK_FE 0x02 /* mask falling edge */
#define PM_IRQF_MASK_RE 0x04 /* mask rising edge */
#define PM_IRQF_CLR 0x08 /* clear interrupt */
#define PM_IRQF_BITS_MASK 0x70
#define PM_IRQF_BITS_SHIFT 4
#define PM_IRQF_WRITE 0x80
#define PM_IRQF_MASK_ALL (PM_IRQF_MASK_FE | \
PM_IRQF_MASK_RE)
#define REG_HWREV 0x002 /* PMIC4 revision */
#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
#define PM8XXX_NR_IRQS 256
#define PM8821_NR_IRQS 112
struct pm_irq_data {
int num_irqs;
struct irq_chip *irq_chip;
irq_handler_t irq_handler;
};
struct pm_irq_chip {
struct regmap *regmap;
spinlock_t pm_irq_lock;
struct irq_domain *irqdomain;
unsigned int num_blocks;
unsigned int num_masters;
const struct pm_irq_data *pm_irq_data;
/* MUST BE AT THE END OF THIS STRUCT */
u8 config[];
};
static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, unsigned int bp,
unsigned int *ip)
{
int rc;
spin_lock(&chip->pm_irq_lock);
rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
if (rc) {
pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
goto bail;
}
rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
if (rc)
pr_err("Failed Reading Status rc=%d\n", rc);
bail:
spin_unlock(&chip->pm_irq_lock);
return rc;
}
static int
pm8xxx_config_irq(struct pm_irq_chip *chip, unsigned int bp, unsigned int cp)
{
int rc;
unsigned long flags;
spin_lock_irqsave(&chip->pm_irq_lock, flags);
rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
if (rc) {
pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
goto bail;
}
cp |= PM_IRQF_WRITE;
rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_CONFIG, cp);
if (rc)
pr_err("Failed Configuring IRQ rc=%d\n", rc);
bail:
spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
return rc;
}
static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
{
int pmirq, i, ret = 0;
unsigned int bits;
ret = pm8xxx_read_block_irq(chip, block, &bits);
if (ret) {
pr_err("Failed reading %d block ret=%d", block, ret);
return ret;
}
if (!bits) {
pr_err("block bit set in master but no irqs: %d", block);
return 0;
}
/* Check IRQ bits */
for (i = 0; i < 8; i++) {
if (bits & (1 << i)) {
pmirq = block * 8 + i;
generic_handle_domain_irq(chip->irqdomain, pmirq);
}
}
return 0;
}
static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
{
unsigned int blockbits;
int block_number, i, ret = 0;
ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_M_STATUS1 + master,
&blockbits);
if (ret) {
pr_err("Failed to read master %d ret=%d\n", master, ret);
return ret;
}
if (!blockbits) {
pr_err("master bit set in root but no blocks: %d", master);
return 0;
}
for (i = 0; i < 8; i++)
if (blockbits & (1 << i)) {
block_number = master * 8 + i; /* block # */
ret |= pm8xxx_irq_block_handler(chip, block_number);
}
return ret;
}
static irqreturn_t pm8xxx_irq_handler(int irq, void *data)
{
struct pm_irq_chip *chip = data;
unsigned int root;
int i, ret, masters = 0;
ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_ROOT, &root);
if (ret) {
pr_err("Can't read root status ret=%d\n", ret);
return IRQ_NONE;
}
/* on pm8xxx series masters start from bit 1 of the root */
masters = root >> 1;
/* Read allowed masters for blocks. */
for (i = 0; i < chip->num_masters; i++)
if (masters & (1 << i))
pm8xxx_irq_master_handler(chip, i);
return IRQ_HANDLED;
}
static void pm8821_irq_block_handler(struct pm_irq_chip *chip,
int master, int block)
{
int pmirq, i, ret;
unsigned int bits;
ret = regmap_read(chip->regmap,
PM8821_SSBI_ADDR_IRQ_ROOT(master, block), &bits);
if (ret) {
pr_err("Reading block %d failed ret=%d", block, ret);
return;
}
/* Convert block offset to global block number */
block += (master * PM8821_BLOCKS_PER_MASTER) - 1;
/* Check IRQ bits */
for (i = 0; i < 8; i++) {
if (bits & BIT(i)) {
pmirq = block * 8 + i;
generic_handle_domain_irq(chip->irqdomain, pmirq);
}
}
}
static inline void pm8821_irq_master_handler(struct pm_irq_chip *chip,
int master, u8 master_val)
{
int block;
for (block = 1; block < 8; block++)
if (master_val & BIT(block))
pm8821_irq_block_handler(chip, master, block);
}
static irqreturn_t pm8821_irq_handler(int irq, void *data)
{
struct pm_irq_chip *chip = data;
unsigned int master;
int ret;
ret = regmap_read(chip->regmap,
PM8821_SSBI_REG_ADDR_IRQ_MASTER0, &master);
if (ret) {
pr_err("Failed to read master 0 ret=%d\n", ret);
return IRQ_NONE;
}
/* bits 1 through 7 marks the first 7 blocks in master 0 */
if (master & GENMASK(7, 1))
pm8821_irq_master_handler(chip, 0, master);
/* bit 0 marks if master 1 contains any bits */
if (!(master & BIT(0)))
return IRQ_NONE;
ret = regmap_read(chip->regmap,
PM8821_SSBI_REG_ADDR_IRQ_MASTER1, &master);
if (ret) {
pr_err("Failed to read master 1 ret=%d\n", ret);
return IRQ_NONE;
}
pm8821_irq_master_handler(chip, 1, master);
return IRQ_HANDLED;
}
static void pm8xxx_irq_mask_ack(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
u8 block, config;
block = pmirq / 8;
config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
pm8xxx_config_irq(chip, block, config);
}
static void pm8xxx_irq_unmask(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
u8 block, config;
block = pmirq / 8;
config = chip->config[pmirq];
pm8xxx_config_irq(chip, block, config);
}
static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
int irq_bit;
u8 block, config;
block = pmirq / 8;
irq_bit = pmirq % 8;
chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
| PM_IRQF_MASK_ALL;
if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
if (flow_type & IRQF_TRIGGER_RISING)
chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
if (flow_type & IRQF_TRIGGER_FALLING)
chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
} else {
chip->config[pmirq] |= PM_IRQF_LVL_SEL;
if (flow_type & IRQF_TRIGGER_HIGH)
chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
else
chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
}
config = chip->config[pmirq] | PM_IRQF_CLR;
return pm8xxx_config_irq(chip, block, config);
}
static int pm8xxx_irq_get_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which,
bool *state)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
unsigned int bits;
unsigned long flags;
int irq_bit;
u8 block;
int rc;
if (which != IRQCHIP_STATE_LINE_LEVEL)
return -EINVAL;
block = pmirq / 8;
irq_bit = pmirq % 8;
spin_lock_irqsave(&chip->pm_irq_lock, flags);
rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
if (rc) {
pr_err("Failed Selecting Block %d rc=%d\n", block, rc);
goto bail;
}
rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
if (rc) {
pr_err("Failed Reading Status rc=%d\n", rc);
goto bail;
}
*state = !!(bits & BIT(irq_bit));
bail:
spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
return rc;
}
static struct irq_chip pm8xxx_irq_chip = {
.name = "pm8xxx",
.irq_mask_ack = pm8xxx_irq_mask_ack,
.irq_unmask = pm8xxx_irq_unmask,
.irq_set_type = pm8xxx_irq_set_type,
.irq_get_irqchip_state = pm8xxx_irq_get_irqchip_state,
.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
};
static void pm8xxx_irq_domain_map(struct pm_irq_chip *chip,
struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq, unsigned int type)
{
irq_domain_set_info(domain, irq, hwirq, chip->pm_irq_data->irq_chip,
chip, handle_level_irq, NULL, NULL);
irq_set_noprobe(irq);
}
static int pm8xxx_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *data)
{
struct pm_irq_chip *chip = domain->host_data;
struct irq_fwspec *fwspec = data;
irq_hw_number_t hwirq;
unsigned int type;
int ret, i;
ret = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
if (ret)
return ret;
for (i = 0; i < nr_irqs; i++)
pm8xxx_irq_domain_map(chip, domain, virq + i, hwirq + i, type);
return 0;
}
static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
.alloc = pm8xxx_irq_domain_alloc,
.free = irq_domain_free_irqs_common,
.translate = irq_domain_translate_twocell,
};
static void pm8821_irq_mask_ack(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
u8 block, master;
int irq_bit, rc;
block = pmirq / 8;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
rc = regmap_update_bits(chip->regmap,
PM8821_SSBI_ADDR_IRQ_MASK(master, block),
BIT(irq_bit), BIT(irq_bit));
if (rc) {
pr_err("Failed to mask IRQ:%d rc=%d\n", pmirq, rc);
return;
}
rc = regmap_update_bits(chip->regmap,
PM8821_SSBI_ADDR_IRQ_CLEAR(master, block),
BIT(irq_bit), BIT(irq_bit));
if (rc)
pr_err("Failed to CLEAR IRQ:%d rc=%d\n", pmirq, rc);
}
static void pm8821_irq_unmask(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = irqd_to_hwirq(d);
int irq_bit, rc;
u8 block, master;
block = pmirq / 8;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
rc = regmap_update_bits(chip->regmap,
PM8821_SSBI_ADDR_IRQ_MASK(master, block),
BIT(irq_bit), ~BIT(irq_bit));
if (rc)
pr_err("Failed to read/write unmask IRQ:%d rc=%d\n", pmirq, rc);
}
static int pm8821_irq_get_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which,
bool *state)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
int rc, pmirq = irqd_to_hwirq(d);
u8 block, irq_bit, master;
unsigned int bits;
block = pmirq / 8;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
rc = regmap_read(chip->regmap,
PM8821_SSBI_ADDR_IRQ_RT_STATUS(master, block), &bits);
if (rc) {
pr_err("Reading Status of IRQ %d failed rc=%d\n", pmirq, rc);
return rc;
}
*state = !!(bits & BIT(irq_bit));
return rc;
}
static struct irq_chip pm8821_irq_chip = {
.name = "pm8821",
.irq_mask_ack = pm8821_irq_mask_ack,
.irq_unmask = pm8821_irq_unmask,
.irq_get_irqchip_state = pm8821_irq_get_irqchip_state,
.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
};
static const struct regmap_config ssbi_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.max_register = 0x3ff,
.fast_io = true,
.reg_read = ssbi_reg_read,
.reg_write = ssbi_reg_write
};
static const struct pm_irq_data pm8xxx_data = {
.num_irqs = PM8XXX_NR_IRQS,
.irq_chip = &pm8xxx_irq_chip,
.irq_handler = pm8xxx_irq_handler,
};
static const struct pm_irq_data pm8821_data = {
.num_irqs = PM8821_NR_IRQS,
.irq_chip = &pm8821_irq_chip,
.irq_handler = pm8821_irq_handler,
};
static const struct of_device_id pm8xxx_id_table[] = {
{ .compatible = "qcom,pm8058", .data = &pm8xxx_data},
{ .compatible = "qcom,pm8821", .data = &pm8821_data},
{ .compatible = "qcom,pm8921", .data = &pm8xxx_data},
{ }
};
MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
static int pm8xxx_probe(struct platform_device *pdev)
{
const struct pm_irq_data *data;
struct regmap *regmap;
int irq, rc;
unsigned int val;
struct pm_irq_chip *chip;
data = of_device_get_match_data(&pdev->dev);
if (!data) {
dev_err(&pdev->dev, "No matching driver data found\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
regmap = devm_regmap_init(&pdev->dev, NULL, pdev->dev.parent,
&ssbi_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
/* Read PMIC chip revision */
rc = regmap_read(regmap, REG_HWREV, &val);
if (rc) {
pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
return rc;
}
pr_info("PMIC revision 1: %02X\n", val);
/* Read PMIC chip revision 2 */
rc = regmap_read(regmap, REG_HWREV_2, &val);
if (rc) {
pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
REG_HWREV_2, rc);
return rc;
}
pr_info("PMIC revision 2: %02X\n", val);
chip = devm_kzalloc(&pdev->dev,
struct_size(chip, config, data->num_irqs),
GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(pdev, chip);
chip->regmap = regmap;
chip->num_blocks = DIV_ROUND_UP(data->num_irqs, 8);
chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
chip->pm_irq_data = data;
spin_lock_init(&chip->pm_irq_lock);
chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node,
data->num_irqs,
&pm8xxx_irq_domain_ops,
chip);
if (!chip->irqdomain)
return -ENODEV;
rc = devm_request_irq(&pdev->dev, irq, data->irq_handler, 0, dev_name(&pdev->dev), chip);
if (rc)
return rc;
irq_set_irq_wake(irq, 1);
rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
if (rc)
irq_domain_remove(chip->irqdomain);
return rc;
}
static int pm8xxx_remove_child(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static void pm8xxx_remove(struct platform_device *pdev)
{
struct pm_irq_chip *chip = platform_get_drvdata(pdev);
device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
irq_domain_remove(chip->irqdomain);
}
static struct platform_driver pm8xxx_driver = {
.probe = pm8xxx_probe,
.remove_new = pm8xxx_remove,
.driver = {
.name = "pm8xxx-core",
.of_match_table = pm8xxx_id_table,
},
};
static int __init pm8xxx_init(void)
{
return platform_driver_register(&pm8xxx_driver);
}
subsys_initcall(pm8xxx_init);
static void __exit pm8xxx_exit(void)
{
platform_driver_unregister(&pm8xxx_driver);
}
module_exit(pm8xxx_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC 8xxx core driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:pm8xxx-core");
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