linux/drivers/mfd/mc13xxx-core.c
Uwe Kleine-König c39cf60feb mfd: mc13xxx: Make mc13xxx_common_exit() return void
Up to now mc13xxx_common_exit() returns zero unconditionally. Make it
return void instead which makes it easier to see in the callers that
there is no error to handle.

Also the return value of i2c and spi remove callbacks is ignored anyway.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211012153945.2651412-9-u.kleine-koenig@pengutronix.de
2021-11-05 14:40:26 +00:00

512 lines
13 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2009-2010 Pengutronix
* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
*
* loosely based on an earlier driver that has
* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include "mc13xxx.h"
#define MC13XXX_IRQSTAT0 0
#define MC13XXX_IRQMASK0 1
#define MC13XXX_IRQSTAT1 3
#define MC13XXX_IRQMASK1 4
#define MC13XXX_REVISION 7
#define MC13XXX_REVISION_REVMETAL (0x07 << 0)
#define MC13XXX_REVISION_REVFULL (0x03 << 3)
#define MC13XXX_REVISION_ICID (0x07 << 6)
#define MC13XXX_REVISION_FIN (0x03 << 9)
#define MC13XXX_REVISION_FAB (0x03 << 11)
#define MC13XXX_REVISION_ICIDCODE (0x3f << 13)
#define MC34708_REVISION_REVMETAL (0x07 << 0)
#define MC34708_REVISION_REVFULL (0x07 << 3)
#define MC34708_REVISION_FIN (0x07 << 6)
#define MC34708_REVISION_FAB (0x07 << 9)
#define MC13XXX_PWRCTRL 15
#define MC13XXX_PWRCTRL_WDIRESET (1 << 12)
#define MC13XXX_ADC1 44
#define MC13XXX_ADC1_ADEN (1 << 0)
#define MC13XXX_ADC1_RAND (1 << 1)
#define MC13XXX_ADC1_ADSEL (1 << 3)
#define MC13XXX_ADC1_ASC (1 << 20)
#define MC13XXX_ADC1_ADTRIGIGN (1 << 21)
#define MC13XXX_ADC2 45
void mc13xxx_lock(struct mc13xxx *mc13xxx)
{
if (!mutex_trylock(&mc13xxx->lock)) {
dev_dbg(mc13xxx->dev, "wait for %s from %ps\n",
__func__, __builtin_return_address(0));
mutex_lock(&mc13xxx->lock);
}
dev_dbg(mc13xxx->dev, "%s from %ps\n",
__func__, __builtin_return_address(0));
}
EXPORT_SYMBOL(mc13xxx_lock);
void mc13xxx_unlock(struct mc13xxx *mc13xxx)
{
dev_dbg(mc13xxx->dev, "%s from %ps\n",
__func__, __builtin_return_address(0));
mutex_unlock(&mc13xxx->lock);
}
EXPORT_SYMBOL(mc13xxx_unlock);
int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
{
int ret;
ret = regmap_read(mc13xxx->regmap, offset, val);
dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val);
return ret;
}
EXPORT_SYMBOL(mc13xxx_reg_read);
int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
{
dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val);
if (val >= BIT(24))
return -EINVAL;
return regmap_write(mc13xxx->regmap, offset, val);
}
EXPORT_SYMBOL(mc13xxx_reg_write);
int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
u32 mask, u32 val)
{
BUG_ON(val & ~mask);
dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n",
offset, val, mask);
return regmap_update_bits(mc13xxx->regmap, offset, mask, val);
}
EXPORT_SYMBOL(mc13xxx_reg_rmw);
int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq)
{
int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
disable_irq_nosync(virq);
return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_mask);
int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq)
{
int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
enable_irq(virq);
return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_unmask);
int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq,
int *enabled, int *pending)
{
int ret;
unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
if (irq < 0 || irq >= ARRAY_SIZE(mc13xxx->irqs))
return -EINVAL;
if (enabled) {
u32 mask;
ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
if (ret)
return ret;
*enabled = mask & irqbit;
}
if (pending) {
u32 stat;
ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
if (ret)
return ret;
*pending = stat & irqbit;
}
return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_status);
int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq,
irq_handler_t handler, const char *name, void *dev)
{
int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
return devm_request_threaded_irq(mc13xxx->dev, virq, NULL, handler,
IRQF_ONESHOT, name, dev);
}
EXPORT_SYMBOL(mc13xxx_irq_request);
int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev)
{
int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
devm_free_irq(mc13xxx->dev, virq, dev);
return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_free);
#define maskval(reg, mask) (((reg) & (mask)) >> __ffs(mask))
static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision)
{
dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
"fin: %d, fab: %d, icid: %d/%d\n",
mc13xxx->variant->name,
maskval(revision, MC13XXX_REVISION_REVFULL),
maskval(revision, MC13XXX_REVISION_REVMETAL),
maskval(revision, MC13XXX_REVISION_FIN),
maskval(revision, MC13XXX_REVISION_FAB),
maskval(revision, MC13XXX_REVISION_ICID),
maskval(revision, MC13XXX_REVISION_ICIDCODE));
}
static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision)
{
dev_info(mc13xxx->dev, "%s: rev %d.%d, fin: %d, fab: %d\n",
mc13xxx->variant->name,
maskval(revision, MC34708_REVISION_REVFULL),
maskval(revision, MC34708_REVISION_REVMETAL),
maskval(revision, MC34708_REVISION_FIN),
maskval(revision, MC34708_REVISION_FAB));
}
/* These are only exported for mc13xxx-i2c and mc13xxx-spi */
struct mc13xxx_variant mc13xxx_variant_mc13783 = {
.name = "mc13783",
.print_revision = mc13xxx_print_revision,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);
struct mc13xxx_variant mc13xxx_variant_mc13892 = {
.name = "mc13892",
.print_revision = mc13xxx_print_revision,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);
struct mc13xxx_variant mc13xxx_variant_mc34708 = {
.name = "mc34708",
.print_revision = mc34708_print_revision,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708);
static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
{
return mc13xxx->variant->name;
}
int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
{
return mc13xxx->flags;
}
EXPORT_SYMBOL(mc13xxx_get_flags);
#define MC13XXX_ADC1_CHAN0_SHIFT 5
#define MC13XXX_ADC1_CHAN1_SHIFT 8
#define MC13783_ADC1_ATO_SHIFT 11
#define MC13783_ADC1_ATOX (1 << 19)
struct mc13xxx_adcdone_data {
struct mc13xxx *mc13xxx;
struct completion done;
};
static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
{
struct mc13xxx_adcdone_data *adcdone_data = data;
complete_all(&adcdone_data->done);
return IRQ_HANDLED;
}
#define MC13XXX_ADC_WORKING (1 << 0)
int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
unsigned int channel, u8 ato, bool atox,
unsigned int *sample)
{
u32 adc0, adc1, old_adc0;
int i, ret;
struct mc13xxx_adcdone_data adcdone_data = {
.mc13xxx = mc13xxx,
};
init_completion(&adcdone_data.done);
dev_dbg(mc13xxx->dev, "%s\n", __func__);
mc13xxx_lock(mc13xxx);
if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
ret = -EBUSY;
goto out;
}
mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
ret = mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
if (ret)
goto out;
adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2 |
MC13XXX_ADC0_CHRGRAWDIV;
adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
/*
* Channels mapped through ADIN7:
* 7 - General purpose ADIN7
* 16 - UID
* 17 - Die temperature
*/
if (channel > 7 && channel < 16) {
adc1 |= MC13XXX_ADC1_ADSEL;
} else if (channel == 16) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_UID;
channel = 7;
} else if (channel == 17) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_DIE;
channel = 7;
}
switch (mode) {
case MC13XXX_ADC_MODE_TS:
adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 |
MC13XXX_ADC0_TSMOD1;
adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
break;
case MC13XXX_ADC_MODE_SINGLE_CHAN:
adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
adc1 |= MC13XXX_ADC1_RAND;
break;
case MC13XXX_ADC_MODE_MULT_CHAN:
adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
break;
default:
mc13xxx_unlock(mc13xxx);
return -EINVAL;
}
adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
if (atox)
adc1 |= MC13783_ADC1_ATOX;
dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__);
mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
mc13xxx_handler_adcdone, __func__, &adcdone_data);
mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);
mc13xxx_unlock(mc13xxx);
ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);
if (!ret)
ret = -ETIMEDOUT;
mc13xxx_lock(mc13xxx);
mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data);
if (ret > 0)
for (i = 0; i < 4; ++i) {
ret = mc13xxx_reg_read(mc13xxx,
MC13XXX_ADC2, &sample[i]);
if (ret)
break;
}
if (mode == MC13XXX_ADC_MODE_TS)
/* restore TSMOD */
mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);
mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
out:
mc13xxx_unlock(mc13xxx);
return ret;
}
EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);
static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
const char *format, void *pdata, size_t pdata_size)
{
char buf[30];
const char *name = mc13xxx_get_chipname(mc13xxx);
struct mfd_cell cell = {
.platform_data = pdata,
.pdata_size = pdata_size,
};
/* there is no asnprintf in the kernel :-( */
if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
return -E2BIG;
cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
if (!cell.name)
return -ENOMEM;
return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0,
regmap_irq_get_domain(mc13xxx->irq_data));
}
static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
{
return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
}
#ifdef CONFIG_OF
static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
{
struct device_node *np = mc13xxx->dev->of_node;
if (!np)
return -ENODEV;
if (of_property_read_bool(np, "fsl,mc13xxx-uses-adc"))
mc13xxx->flags |= MC13XXX_USE_ADC;
if (of_property_read_bool(np, "fsl,mc13xxx-uses-codec"))
mc13xxx->flags |= MC13XXX_USE_CODEC;
if (of_property_read_bool(np, "fsl,mc13xxx-uses-rtc"))
mc13xxx->flags |= MC13XXX_USE_RTC;
if (of_property_read_bool(np, "fsl,mc13xxx-uses-touch"))
mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;
return 0;
}
#else
static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
{
return -ENODEV;
}
#endif
int mc13xxx_common_init(struct device *dev)
{
struct mc13xxx_platform_data *pdata = dev_get_platdata(dev);
struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
u32 revision;
int i, ret;
mc13xxx->dev = dev;
ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
if (ret)
return ret;
mc13xxx->variant->print_revision(mc13xxx, revision);
ret = mc13xxx_reg_rmw(mc13xxx, MC13XXX_PWRCTRL,
MC13XXX_PWRCTRL_WDIRESET, MC13XXX_PWRCTRL_WDIRESET);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) {
mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG;
mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG);
}
mc13xxx->irq_chip.name = dev_name(dev);
mc13xxx->irq_chip.status_base = MC13XXX_IRQSTAT0;
mc13xxx->irq_chip.mask_base = MC13XXX_IRQMASK0;
mc13xxx->irq_chip.ack_base = MC13XXX_IRQSTAT0;
mc13xxx->irq_chip.irq_reg_stride = MC13XXX_IRQSTAT1 - MC13XXX_IRQSTAT0;
mc13xxx->irq_chip.init_ack_masked = true;
mc13xxx->irq_chip.use_ack = true;
mc13xxx->irq_chip.num_regs = MC13XXX_IRQ_REG_CNT;
mc13xxx->irq_chip.irqs = mc13xxx->irqs;
mc13xxx->irq_chip.num_irqs = ARRAY_SIZE(mc13xxx->irqs);
ret = regmap_add_irq_chip(mc13xxx->regmap, mc13xxx->irq, IRQF_ONESHOT,
0, &mc13xxx->irq_chip, &mc13xxx->irq_data);
if (ret)
return ret;
mutex_init(&mc13xxx->lock);
if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
mc13xxx->flags = pdata->flags;
if (pdata) {
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
&pdata->regulators, sizeof(pdata->regulators));
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
pdata->leds, sizeof(*pdata->leds));
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
pdata->buttons, sizeof(*pdata->buttons));
if (mc13xxx->flags & MC13XXX_USE_CODEC)
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-codec",
pdata->codec, sizeof(*pdata->codec));
if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
&pdata->touch, sizeof(pdata->touch));
} else {
mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
mc13xxx_add_subdevice(mc13xxx, "%s-led");
mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
if (mc13xxx->flags & MC13XXX_USE_CODEC)
mc13xxx_add_subdevice(mc13xxx, "%s-codec");
if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
mc13xxx_add_subdevice(mc13xxx, "%s-ts");
}
if (mc13xxx->flags & MC13XXX_USE_ADC)
mc13xxx_add_subdevice(mc13xxx, "%s-adc");
if (mc13xxx->flags & MC13XXX_USE_RTC)
mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
return 0;
}
EXPORT_SYMBOL_GPL(mc13xxx_common_init);
void mc13xxx_common_exit(struct device *dev)
{
struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
mfd_remove_devices(dev);
regmap_del_irq_chip(mc13xxx->irq, mc13xxx->irq_data);
mutex_destroy(&mc13xxx->lock);
}
EXPORT_SYMBOL_GPL(mc13xxx_common_exit);
MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
MODULE_LICENSE("GPL v2");