kernel-aes67/drivers/mfd/motorola-cpcap.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Motorola CPCAP PMIC core driver
*
* Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/regmap.h>
#include <linux/sysfs.h>
#include <linux/mfd/core.h>
#include <linux/mfd/motorola-cpcap.h>
#include <linux/spi/spi.h>
#define CPCAP_NR_IRQ_REG_BANKS 6
#define CPCAP_NR_IRQ_CHIPS 3
#define CPCAP_REGISTER_SIZE 4
#define CPCAP_REGISTER_BITS 16
struct cpcap_ddata {
struct spi_device *spi;
struct regmap_irq *irqs;
struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
const struct regmap_config *regmap_conf;
struct regmap *regmap;
};
static int cpcap_sense_irq(struct regmap *regmap, int irq)
{
int regnum = irq / CPCAP_REGISTER_BITS;
int mask = BIT(irq % CPCAP_REGISTER_BITS);
int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
int err, val;
if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
return -EINVAL;
err = regmap_read(regmap, reg, &val);
if (err)
return err;
return !!(val & mask);
}
int cpcap_sense_virq(struct regmap *regmap, int virq)
{
struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
int irq_base = regmap_irq_chip_get_base(d);
return cpcap_sense_irq(regmap, virq - irq_base);
}
EXPORT_SYMBOL_GPL(cpcap_sense_virq);
static int cpcap_check_revision(struct cpcap_ddata *cpcap)
{
u16 vendor, rev;
int ret;
ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
if (ret)
return ret;
ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
if (ret)
return ret;
dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
rev);
if (rev < CPCAP_REVISION_2_1) {
dev_info(&cpcap->spi->dev,
"Please add old CPCAP revision support as needed\n");
return -ENODEV;
}
return 0;
}
/*
* First two irq chips are the two private macro interrupt chips, the third
* irq chip is for register banks 1 - 4 and is available for drivers to use.
*/
static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
{
.name = "cpcap-m2",
.num_regs = 1,
.status_base = CPCAP_REG_MI1,
.ack_base = CPCAP_REG_MI1,
.mask_base = CPCAP_REG_MIM1,
.use_ack = true,
mfd: cpcap: Fix interrupt regression with regmap clear_ack With commit 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers"), the cpcap interrupts are no longer getting acked properly leading to a very unresponsive device with CPUs fully loaded spinning in the threaded IRQ handlers. To me it looks like the clear_ack commit above actually fixed a long standing bug in regmap_irq_thread() where we unconditionally acked the interrupts earlier without considering ack_invert. And the issue with cpcap started happening as we now also consider ack_invert. Tim Harvey <tharvey@gateworks.com> tried to fix this issue earlier with "[PATCH v2] regmap: irq: fix ack-invert", but the reading of the ack register was considered unnecessary for just ack_invert, and we did not have clear_ack available yet. As the cpcap irqs worked both with and without ack_invert earlier because of the unconditional ack, the problem remained hidden until now. Also, looks like the earlier v3.0.8 based Motorola Android Linux kernel does clear_ack style read-clear-write with "ireg_val & ~mreg_val" instead of just ack_invert style write. So let's switch cpcap to use clear_ack to fix the issue. Fixes: 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers") Cc: Carl Philipp Klemm <philipp@uvos.xyz> Cc: Laxminath Kasam <lkasam@codeaurora.org> Cc: Merlijn Wajer <merlijn@wizzup.org> Cc: Mark Brown <broonie@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Cc: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Pavel Machek <pavel@ucw.cz> Reviewed-By: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-11-11 12:06:13 -05:00
.clear_ack = true,
},
{
.name = "cpcap-m2",
.num_regs = 1,
.status_base = CPCAP_REG_MI2,
.ack_base = CPCAP_REG_MI2,
.mask_base = CPCAP_REG_MIM2,
.use_ack = true,
mfd: cpcap: Fix interrupt regression with regmap clear_ack With commit 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers"), the cpcap interrupts are no longer getting acked properly leading to a very unresponsive device with CPUs fully loaded spinning in the threaded IRQ handlers. To me it looks like the clear_ack commit above actually fixed a long standing bug in regmap_irq_thread() where we unconditionally acked the interrupts earlier without considering ack_invert. And the issue with cpcap started happening as we now also consider ack_invert. Tim Harvey <tharvey@gateworks.com> tried to fix this issue earlier with "[PATCH v2] regmap: irq: fix ack-invert", but the reading of the ack register was considered unnecessary for just ack_invert, and we did not have clear_ack available yet. As the cpcap irqs worked both with and without ack_invert earlier because of the unconditional ack, the problem remained hidden until now. Also, looks like the earlier v3.0.8 based Motorola Android Linux kernel does clear_ack style read-clear-write with "ireg_val & ~mreg_val" instead of just ack_invert style write. So let's switch cpcap to use clear_ack to fix the issue. Fixes: 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers") Cc: Carl Philipp Klemm <philipp@uvos.xyz> Cc: Laxminath Kasam <lkasam@codeaurora.org> Cc: Merlijn Wajer <merlijn@wizzup.org> Cc: Mark Brown <broonie@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Cc: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Pavel Machek <pavel@ucw.cz> Reviewed-By: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-11-11 12:06:13 -05:00
.clear_ack = true,
},
{
.name = "cpcap1-4",
.num_regs = 4,
.status_base = CPCAP_REG_INT1,
.ack_base = CPCAP_REG_INT1,
.mask_base = CPCAP_REG_INTM1,
.use_ack = true,
mfd: cpcap: Fix interrupt regression with regmap clear_ack With commit 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers"), the cpcap interrupts are no longer getting acked properly leading to a very unresponsive device with CPUs fully loaded spinning in the threaded IRQ handlers. To me it looks like the clear_ack commit above actually fixed a long standing bug in regmap_irq_thread() where we unconditionally acked the interrupts earlier without considering ack_invert. And the issue with cpcap started happening as we now also consider ack_invert. Tim Harvey <tharvey@gateworks.com> tried to fix this issue earlier with "[PATCH v2] regmap: irq: fix ack-invert", but the reading of the ack register was considered unnecessary for just ack_invert, and we did not have clear_ack available yet. As the cpcap irqs worked both with and without ack_invert earlier because of the unconditional ack, the problem remained hidden until now. Also, looks like the earlier v3.0.8 based Motorola Android Linux kernel does clear_ack style read-clear-write with "ireg_val & ~mreg_val" instead of just ack_invert style write. So let's switch cpcap to use clear_ack to fix the issue. Fixes: 3a6f0fb7b8eb ("regmap: irq: Add support to clear ack registers") Cc: Carl Philipp Klemm <philipp@uvos.xyz> Cc: Laxminath Kasam <lkasam@codeaurora.org> Cc: Merlijn Wajer <merlijn@wizzup.org> Cc: Mark Brown <broonie@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Cc: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Pavel Machek <pavel@ucw.cz> Reviewed-By: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-11-11 12:06:13 -05:00
.clear_ack = true,
},
};
static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
struct regmap_irq *rirq,
int irq_base, int irq)
{
unsigned int reg_offset;
unsigned int bit, mask;
reg_offset = irq - irq_base;
reg_offset /= cpcap->regmap_conf->val_bits;
reg_offset *= cpcap->regmap_conf->reg_stride;
bit = irq % cpcap->regmap_conf->val_bits;
mask = (1 << bit);
rirq->reg_offset = reg_offset;
rirq->mask = mask;
}
static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
int irq_start, int nr_irqs)
{
struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
int i, ret;
for (i = irq_start; i < irq_start + nr_irqs; i++) {
struct regmap_irq *rirq = &cpcap->irqs[i];
cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
}
chip->irqs = &cpcap->irqs[irq_start];
chip->num_irqs = nr_irqs;
chip->irq_drv_data = cpcap;
ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
cpcap->spi->irq,
irq_get_trigger_type(cpcap->spi->irq) |
IRQF_SHARED, -1,
chip, &cpcap->irqdata[irq_chip]);
if (ret) {
dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
irq_chip, ret);
return ret;
}
return 0;
}
static int cpcap_init_irq(struct cpcap_ddata *cpcap)
{
int ret;
cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
treewide: devm_kzalloc() -> devm_kcalloc() The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 17:07:58 -04:00
array3_size(sizeof(*cpcap->irqs),
CPCAP_NR_IRQ_REG_BANKS,
cpcap->regmap_conf->val_bits),
GFP_KERNEL);
if (!cpcap->irqs)
return -ENOMEM;
ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
if (ret)
return ret;
ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
if (ret)
return ret;
ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
if (ret)
return ret;
enable_irq_wake(cpcap->spi->irq);
return 0;
}
static const struct of_device_id cpcap_of_match[] = {
{ .compatible = "motorola,cpcap", },
{ .compatible = "st,6556002", },
{},
};
MODULE_DEVICE_TABLE(of, cpcap_of_match);
static const struct spi_device_id cpcap_spi_ids[] = {
{ .name = "cpcap", },
{ .name = "6556002", },
{},
};
MODULE_DEVICE_TABLE(spi, cpcap_spi_ids);
static const struct regmap_config cpcap_regmap_config = {
.reg_bits = 16,
.reg_stride = 4,
.pad_bits = 0,
.val_bits = 16,
.write_flag_mask = 0x8000,
.max_register = CPCAP_REG_ST_TEST2,
.cache_type = REGCACHE_NONE,
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int cpcap_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
disable_irq(spi->irq);
return 0;
}
static int cpcap_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
enable_irq(spi->irq);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
static const struct mfd_cell cpcap_mfd_devices[] = {
{
.name = "cpcap_adc",
.of_compatible = "motorola,mapphone-cpcap-adc",
}, {
.name = "cpcap_battery",
.of_compatible = "motorola,cpcap-battery",
}, {
.name = "cpcap-charger",
.of_compatible = "motorola,mapphone-cpcap-charger",
}, {
.name = "cpcap-regulator",
.of_compatible = "motorola,mapphone-cpcap-regulator",
}, {
.name = "cpcap-rtc",
.of_compatible = "motorola,cpcap-rtc",
}, {
.name = "cpcap-pwrbutton",
.of_compatible = "motorola,cpcap-pwrbutton",
}, {
.name = "cpcap-usb-phy",
.of_compatible = "motorola,mapphone-cpcap-usb-phy",
}, {
.name = "cpcap-led",
.id = 0,
.of_compatible = "motorola,cpcap-led-red",
}, {
.name = "cpcap-led",
.id = 1,
.of_compatible = "motorola,cpcap-led-green",
}, {
.name = "cpcap-led",
.id = 2,
.of_compatible = "motorola,cpcap-led-blue",
}, {
.name = "cpcap-led",
.id = 3,
.of_compatible = "motorola,cpcap-led-adl",
}, {
.name = "cpcap-led",
.id = 4,
.of_compatible = "motorola,cpcap-led-cp",
}, {
.name = "cpcap-codec",
}
};
static int cpcap_probe(struct spi_device *spi)
{
struct cpcap_ddata *cpcap;
int ret;
cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
if (!cpcap)
return -ENOMEM;
cpcap->spi = spi;
spi_set_drvdata(spi, cpcap);
spi->bits_per_word = 16;
spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
ret = spi_setup(spi);
if (ret)
return ret;
cpcap->regmap_conf = &cpcap_regmap_config;
cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
if (IS_ERR(cpcap->regmap)) {
ret = PTR_ERR(cpcap->regmap);
dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
ret);
return ret;
}
ret = cpcap_check_revision(cpcap);
if (ret) {
dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
return ret;
}
ret = cpcap_init_irq(cpcap);
if (ret)
return ret;
/* Parent SPI controller uses DMA, CPCAP and child devices do not */
spi->dev.coherent_dma_mask = 0;
spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
}
static struct spi_driver cpcap_driver = {
.driver = {
.name = "cpcap-core",
.of_match_table = cpcap_of_match,
.pm = pm_sleep_ptr(&cpcap_pm),
},
.probe = cpcap_probe,
.id_table = cpcap_spi_ids,
};
module_spi_driver(cpcap_driver);
MODULE_ALIAS("platform:cpcap");
MODULE_DESCRIPTION("CPCAP driver");
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_LICENSE("GPL v2");