linux/drivers/mfd/motorola-cpcap.c
Tony Lindgren 56e1d40d3b mfd: cpcap: Add minimal support
Many Motorola phones like droid 4 are using a custom PMIC called CPCAP
or 6556002. We can support it's core features quite easily with regmap_spi
and regmap_irq.

The children of cpcap, such as regulators, ADC and USB, can be just regular
device drivers and defined in the dts file. They get probed as we call
of_platform_populate() at the end of our probe, and then the children
can just call dev_get_regmap(dev.parent, NULL) to get the regmap.

Cc: devicetree@vger.kernel.org
Cc: Marcel Partap <mpartap@gmx.net>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Scott <michael.scott@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-02-13 09:29:44 +00:00

260 lines
5.8 KiB
C

/*
* Motorola CPCAP PMIC core driver
*
* Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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/of_device.h>
#include <linux/regmap.h>
#include <linux/sysfs.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
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_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,
},
{
.name = "cpcap-m2",
.num_regs = 1,
.status_base = CPCAP_REG_MI2,
.ack_base = CPCAP_REG_MI2,
.mask_base = CPCAP_REG_MIM2,
.use_ack = true,
},
{
.name = "cpcap1-4",
.num_regs = 4,
.status_base = CPCAP_REG_INT1,
.ack_base = CPCAP_REG_INT1,
.mask_base = CPCAP_REG_INTM1,
.type_base = CPCAP_REG_INTS1,
.use_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,
IRQF_TRIGGER_RISING |
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,
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 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_probe(struct spi_device *spi)
{
const struct of_device_id *match;
struct cpcap_ddata *cpcap;
int ret;
match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
if (!match)
return -ENODEV;
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;
return of_platform_populate(spi->dev.of_node, NULL, NULL,
&cpcap->spi->dev);
}
static int cpcap_remove(struct spi_device *pdev)
{
struct cpcap_ddata *cpcap = spi_get_drvdata(pdev);
of_platform_depopulate(&cpcap->spi->dev);
return 0;
}
static struct spi_driver cpcap_driver = {
.driver = {
.name = "cpcap-core",
.of_match_table = cpcap_of_match,
},
.probe = cpcap_probe,
.remove = cpcap_remove,
};
module_spi_driver(cpcap_driver);
MODULE_ALIAS("platform:cpcap");
MODULE_DESCRIPTION("CPCAP driver");
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_LICENSE("GPL v2");