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pinctrl: mcp23s08: Split to three parts: core, I²C, SPI

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Split the driver to three parts: core, I²C, SPI.
No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200407173849.43628-9-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2020-04-07 20:38:49 +03:00 committed by Linus Walleij
parent 7b04aaaf66
commit 0f04a81784
6 changed files with 459 additions and 452 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/pinctrl/Kconfig
View File

@ -172,15 +172,22 @@ config PINCTRL_GEMINI
select GENERIC_PINCONF
select MFD_SYSCON
config PINCTRL_MCP23S08_I2C
tristate
select REGMAP_I2C
config PINCTRL_MCP23S08_SPI
tristate
select REGMAP_SPI
config PINCTRL_MCP23S08
tristate "Microchip MCP23xxx I/O expander"
depends on SPI_MASTER || I2C
depends on I2C || I2C=n
select GPIOLIB
select GPIOLIB_IRQCHIP
select REGMAP_I2C if I2C
select REGMAP_SPI if SPI_MASTER
select GENERIC_PINCONF
select PINCTRL_MCP23S08_I2C if I2C
select PINCTRL_MCP23S08_SPI if SPI_MASTER
help
SPI/I2C driver for Microchip MCP23S08 / MCP23S17 / MCP23S18 /
MCP23008 / MCP23017 / MCP23018 I/O expanders.

2
drivers/pinctrl/Makefile
View File

@ -21,6 +21,8 @@ obj-$(CONFIG_PINCTRL_DIGICOLOR) += pinctrl-digicolor.o
obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_GEMINI) += pinctrl-gemini.o
obj-$(CONFIG_PINCTRL_MAX77620) += pinctrl-max77620.o
obj-$(CONFIG_PINCTRL_MCP23S08_I2C) += pinctrl-mcp23s08_i2c.o
obj-$(CONFIG_PINCTRL_MCP23S08_SPI) += pinctrl-mcp23s08_spi.o
obj-$(CONFIG_PINCTRL_MCP23S08) += pinctrl-mcp23s08.o
obj-$(CONFIG_PINCTRL_MESON) += meson/
obj-$(CONFIG_PINCTRL_OXNAS) += pinctrl-oxnas.o

458
drivers/pinctrl/pinctrl-mcp23s08.c
View File

@ -7,9 +7,8 @@
#include <linux/mutex.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <linux/interrupt.h>
@ -18,15 +17,7 @@
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
/*
* MCP types supported by driver
*/
#define MCP_TYPE_S08 1
#define MCP_TYPE_S17 2
#define MCP_TYPE_008 3
#define MCP_TYPE_017 4
#define MCP_TYPE_S18 5
#define MCP_TYPE_018 6
#include "pinctrl-mcp23s08.h"
/* Registers are all 8 bits wide.
*
@ -51,31 +42,6 @@
#define MCP_GPIO 0x09
#define MCP_OLAT 0x0a
struct mcp23s08;
struct mcp23s08 {
u8 addr;
bool irq_active_high;
bool reg_shift;
u16 irq_rise;
u16 irq_fall;
int irq;
bool irq_controller;
int cached_gpio;
/* lock protects regmap access with bypass/cache flags */
struct mutex lock;
struct gpio_chip chip;
struct irq_chip irq_chip;
struct regmap *regmap;
struct device *dev;
struct pinctrl_dev *pctldev;
struct pinctrl_desc pinctrl_desc;
};
static const struct reg_default mcp23x08_defaults[] = {
{.reg = MCP_IODIR, .def = 0xff},
{.reg = MCP_IPOL, .def = 0x00},
@ -107,7 +73,7 @@ static const struct regmap_access_table mcp23x08_precious_table = {
.n_yes_ranges = 1,
};
static const struct regmap_config mcp23x08_regmap = {
const struct regmap_config mcp23x08_regmap = {
.reg_bits = 8,
.val_bits = 8,
@ -119,6 +85,7 @@ static const struct regmap_config mcp23x08_regmap = {
.cache_type = REGCACHE_FLAT,
.max_register = MCP_OLAT,
};
EXPORT_SYMBOL_GPL(mcp23x08_regmap);
static const struct reg_default mcp23x16_defaults[] = {
{.reg = MCP_IODIR << 1, .def = 0xffff},
@ -151,7 +118,7 @@ static const struct regmap_access_table mcp23x16_precious_table = {
.n_yes_ranges = 1,
};
static const struct regmap_config mcp23x17_regmap = {
const struct regmap_config mcp23x17_regmap = {
.reg_bits = 8,
.val_bits = 16,
@ -164,6 +131,7 @@ static const struct regmap_config mcp23x17_regmap = {
.cache_type = REGCACHE_FLAT,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
EXPORT_SYMBOL_GPL(mcp23x17_regmap);
static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val)
{
@ -579,9 +547,8 @@ static int mcp23s08_irqchip_setup(struct mcp23s08 *mcp)
/*----------------------------------------------------------------------*/
static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
unsigned int addr, unsigned int type,
unsigned int base)
int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
unsigned int addr, unsigned int type, unsigned int base)
{
int status, ret;
bool mirror = false;
@ -690,411 +657,4 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret);
return ret;
}
/*----------------------------------------------------------------------*/
#if IS_ENABLED(CONFIG_I2C)
static int mcp230xx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
unsigned int type = id->driver_data;
struct mcp23s08 *mcp;
int status;
mcp = devm_kzalloc(&client->dev, sizeof(*mcp), GFP_KERNEL);
if (!mcp)
return -ENOMEM;
mcp->irq = client->irq;
switch (type) {
case MCP_TYPE_008:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
mcp->reg_shift = 0;
mcp->chip.ngpio = 8;
mcp->chip.label = "mcp23008";
break;
case MCP_TYPE_017:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23017";
break;
case MCP_TYPE_018:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23018";
break;
default:
dev_err(dev, "invalid device type (%d)\n", type);
return -EINVAL;
}
if (IS_ERR(mcp->regmap))
return PTR_ERR(mcp->regmap);
mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
status = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
if (status)
return status;
i2c_set_clientdata(client, mcp);
return 0;
}
static const struct i2c_device_id mcp230xx_id[] = {
{ "mcp23008", MCP_TYPE_008 },
{ "mcp23017", MCP_TYPE_017 },
{ "mcp23018", MCP_TYPE_018 },
{ },
};
MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
static const struct of_device_id mcp23s08_i2c_of_match[] = {
{
.compatible = "microchip,mcp23008",
.data = (void *) MCP_TYPE_008,
},
{
.compatible = "microchip,mcp23017",
.data = (void *) MCP_TYPE_017,
},
{
.compatible = "microchip,mcp23018",
.data = (void *) MCP_TYPE_018,
},
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
{
.compatible = "mcp,mcp23008",
.data = (void *) MCP_TYPE_008,
},
{
.compatible = "mcp,mcp23017",
.data = (void *) MCP_TYPE_017,
},
{ },
};
MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
static struct i2c_driver mcp230xx_driver = {
.driver = {
.name = "mcp230xx",
.of_match_table = mcp23s08_i2c_of_match,
},
.probe = mcp230xx_probe,
.id_table = mcp230xx_id,
};
static int __init mcp23s08_i2c_init(void)
{
return i2c_add_driver(&mcp230xx_driver);
}
static void mcp23s08_i2c_exit(void)
{
i2c_del_driver(&mcp230xx_driver);
}
#else
static int __init mcp23s08_i2c_init(void) { return 0; }
static void mcp23s08_i2c_exit(void) { }
#endif /* CONFIG_I2C */
/*----------------------------------------------------------------------*/
#ifdef CONFIG_SPI_MASTER
#define MCP_MAX_DEV_PER_CS 8
static int mcp23sxx_spi_write(void *context, const void *data, size_t count)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
struct spi_message m;
struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
{ .tx_buf = data, .len = count, }, };
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
return spi_sync(spi, &m);
}
static int mcp23sxx_spi_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
struct spi_message m;
struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
{ .tx_buf = reg, .len = reg_size, },
{ .tx_buf = val, .len = val_size, }, };
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
spi_message_add_tail(&t[2], &m);
return spi_sync(spi, &m);
}
static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
u8 tx[2];
if (reg_size != 1)
return -EINVAL;
tx[0] = mcp->addr | 0x01;
tx[1] = *((u8 *) reg);
return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
}
static const struct regmap_bus mcp23sxx_spi_regmap = {
.write = mcp23sxx_spi_write,
.gather_write = mcp23sxx_spi_gather_write,
.read = mcp23sxx_spi_read,
};
/* A given spi_device can represent up to eight mcp23sxx chips
* sharing the same chipselect but using different addresses
* (e.g. chips #0 and #3 might be populated, but not #1 or $2).
* Driver data holds all the per-chip data.
*/
struct mcp23s08_driver_data {
unsigned ngpio;
struct mcp23s08 *mcp[8];
struct mcp23s08 chip[];
};
static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
unsigned int addr, unsigned int type)
{
const struct regmap_config *config;
struct regmap_config *copy;
const char *name;
switch (type) {
case MCP_TYPE_S08:
mcp->reg_shift = 0;
mcp->chip.ngpio = 8;
mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d",
addr);
config = &mcp23x08_regmap;
name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
break;
case MCP_TYPE_S17:
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d",
addr);
config = &mcp23x17_regmap;
name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
break;
case MCP_TYPE_S18:
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23s18";
config = &mcp23x17_regmap;
name = config->name;
break;
default:
dev_err(dev, "invalid device type (%d)\n", type);
return -EINVAL;
}
copy = devm_kmemdup(dev, &config, sizeof(config), GFP_KERNEL);
if (!copy)
return -ENOMEM;
copy->name = name;
mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);
if (IS_ERR(mcp->regmap))
return PTR_ERR(mcp->regmap);
return 0;
}
static int mcp23s08_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
unsigned long spi_present_mask;
const void *match;
int chips;
u32 v;
unsigned addr;
struct mcp23s08_driver_data *data;
int status, type;
unsigned ngpio = 0;
match = device_get_match_data(dev);
if (match)
type = (int)(uintptr_t)match;
else
type = spi_get_device_id(spi)->driver_data;
status = device_property_read_u32(dev, "microchip,spi-present-mask", &v);
if (status) {
status = device_property_read_u32(dev, "mcp,spi-present-mask", &v);
if (status) {
dev_err(&spi->dev, "missing spi-present-mask");
return status;
}
}
spi_present_mask = v;
if (!spi_present_mask || spi_present_mask >= BIT(MCP_MAX_DEV_PER_CS)) {
dev_err(&spi->dev, "invalid spi-present-mask");
return -ENODEV;
}
chips = hweight_long(spi_present_mask);
data = devm_kzalloc(&spi->dev,
struct_size(data, chip, chips), GFP_KERNEL);
if (!data)
return -ENOMEM;
spi_set_drvdata(spi, data);
for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
data->mcp[addr] = &data->chip[--chips];
data->mcp[addr]->irq = spi->irq;
status = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, type);
if (status)
return status;
data->mcp[addr]->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
"mcp23xxx-pinctrl.%d", addr);
if (!data->mcp[addr]->pinctrl_desc.name)
return -ENOMEM;
status = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 | (addr << 1), type, -1);
if (status < 0)
return status;
ngpio += data->mcp[addr]->chip.ngpio;
}
data->ngpio = ngpio;
return 0;
}
static const struct spi_device_id mcp23s08_ids[] = {
{ "mcp23s08", MCP_TYPE_S08 },
{ "mcp23s17", MCP_TYPE_S17 },
{ "mcp23s18", MCP_TYPE_S18 },
{ },
};
MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
static const struct of_device_id mcp23s08_spi_of_match[] = {
{
.compatible = "microchip,mcp23s08",
.data = (void *) MCP_TYPE_S08,
},
{
.compatible = "microchip,mcp23s17",
.data = (void *) MCP_TYPE_S17,
},
{
.compatible = "microchip,mcp23s18",
.data = (void *) MCP_TYPE_S18,
},
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
{
.compatible = "mcp,mcp23s08",
.data = (void *) MCP_TYPE_S08,
},
{
.compatible = "mcp,mcp23s17",
.data = (void *) MCP_TYPE_S17,
},
{ },
};
MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
static struct spi_driver mcp23s08_driver = {
.probe = mcp23s08_probe,
.id_table = mcp23s08_ids,
.driver = {
.name = "mcp23s08",
.of_match_table = mcp23s08_spi_of_match,
},
};
static int __init mcp23s08_spi_init(void)
{
return spi_register_driver(&mcp23s08_driver);
}
static void mcp23s08_spi_exit(void)
{
spi_unregister_driver(&mcp23s08_driver);
}
#else
static int __init mcp23s08_spi_init(void) { return 0; }
static void mcp23s08_spi_exit(void) { }
#endif /* CONFIG_SPI_MASTER */
/*----------------------------------------------------------------------*/
static int __init mcp23s08_init(void)
{
int ret;
ret = mcp23s08_spi_init();
if (ret)
goto spi_fail;
ret = mcp23s08_i2c_init();
if (ret)
goto i2c_fail;
return 0;
i2c_fail:
mcp23s08_spi_exit();
spi_fail:
return ret;
}
/* register after spi/i2c postcore initcall and before
* subsys initcalls that may rely on these GPIOs
*/
subsys_initcall(mcp23s08_init);
static void __exit mcp23s08_exit(void)
{
mcp23s08_spi_exit();
mcp23s08_i2c_exit();
}
module_exit(mcp23s08_exit);
MODULE_LICENSE("GPL");
EXPORT_SYMBOL_GPL(mcp23s08_probe_one);

52
drivers/pinctrl/pinctrl-mcp23s08.h Normal file
View File

@ -0,0 +1,52 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/* MCP23S08 SPI/I2C GPIO driver */
#include <linux/gpio/driver.h>
#include <linux/irq.h>
#include <linux/mutex.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/types.h>
/*
* MCP types supported by driver
*/
#define MCP_TYPE_S08 1
#define MCP_TYPE_S17 2
#define MCP_TYPE_008 3
#define MCP_TYPE_017 4
#define MCP_TYPE_S18 5
#define MCP_TYPE_018 6
struct device;
struct regmap;
struct pinctrl_dev;
struct mcp23s08 {
u8 addr;
bool irq_active_high;
bool reg_shift;
u16 irq_rise;
u16 irq_fall;
int irq;
bool irq_controller;
int cached_gpio;
/* lock protects regmap access with bypass/cache flags */
struct mutex lock;
struct gpio_chip chip;
struct irq_chip irq_chip;
struct regmap *regmap;
struct device *dev;
struct pinctrl_dev *pctldev;
struct pinctrl_desc pinctrl_desc;
};
extern const struct regmap_config mcp23x08_regmap;
extern const struct regmap_config mcp23x17_regmap;
int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
unsigned int addr, unsigned int type, unsigned int base);

124
drivers/pinctrl/pinctrl-mcp23s08_i2c.c Normal file
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@ -0,0 +1,124 @@
// SPDX-License-Identifier: GPL-2.0-only
/* MCP23S08 I2C GPIO driver */
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include "pinctrl-mcp23s08.h"
static int mcp230xx_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
unsigned int type = id->driver_data;
struct mcp23s08 *mcp;
int ret;
mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
if (!mcp)
return -ENOMEM;
switch (type) {
case MCP_TYPE_008:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
mcp->reg_shift = 0;
mcp->chip.ngpio = 8;
mcp->chip.label = "mcp23008";
break;
case MCP_TYPE_017:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23017";
break;
case MCP_TYPE_018:
mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23018";
break;
default:
dev_err(dev, "invalid device type (%d)\n", type);
return -EINVAL;
}
if (IS_ERR(mcp->regmap))
return PTR_ERR(mcp->regmap);
mcp->irq = client->irq;
mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
if (ret)
return ret;
i2c_set_clientdata(client, mcp);
return 0;
}
static const struct i2c_device_id mcp230xx_id[] = {
{ "mcp23008", MCP_TYPE_008 },
{ "mcp23017", MCP_TYPE_017 },
{ "mcp23018", MCP_TYPE_018 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
static const struct of_device_id mcp23s08_i2c_of_match[] = {
{
.compatible = "microchip,mcp23008",
.data = (void *) MCP_TYPE_008,
},
{
.compatible = "microchip,mcp23017",
.data = (void *) MCP_TYPE_017,
},
{
.compatible = "microchip,mcp23018",
.data = (void *) MCP_TYPE_018,
},
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
{
.compatible = "mcp,mcp23008",
.data = (void *) MCP_TYPE_008,
},
{
.compatible = "mcp,mcp23017",
.data = (void *) MCP_TYPE_017,
},
{ }
};
MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
static struct i2c_driver mcp230xx_driver = {
.driver = {
.name = "mcp230xx",
.of_match_table = mcp23s08_i2c_of_match,
},
.probe = mcp230xx_probe,
.id_table = mcp230xx_id,
};
static int __init mcp23s08_i2c_init(void)
{
return i2c_add_driver(&mcp230xx_driver);
}
/*
* Register after I²C postcore initcall and before
* subsys initcalls that may rely on these GPIOs.
*/
subsys_initcall(mcp23s08_i2c_init);
static void mcp23s08_i2c_exit(void)
{
i2c_del_driver(&mcp230xx_driver);
}
module_exit(mcp23s08_i2c_exit);
MODULE_LICENSE("GPL");

262
drivers/pinctrl/pinctrl-mcp23s08_spi.c Normal file
View File

@ -0,0 +1,262 @@
// SPDX-License-Identifier: GPL-2.0-only
/* MCP23S08 SPI GPIO driver */
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include "pinctrl-mcp23s08.h"
#define MCP_MAX_DEV_PER_CS 8
/*
* A given spi_device can represent up to eight mcp23sxx chips
* sharing the same chipselect but using different addresses
* (e.g. chips #0 and #3 might be populated, but not #1 or #2).
* Driver data holds all the per-chip data.
*/
struct mcp23s08_driver_data {
unsigned ngpio;
struct mcp23s08 *mcp[8];
struct mcp23s08 chip[];
};
static int mcp23sxx_spi_write(void *context, const void *data, size_t count)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
struct spi_message m;
struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
{ .tx_buf = data, .len = count, }, };
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
return spi_sync(spi, &m);
}
static int mcp23sxx_spi_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
struct spi_message m;
struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
{ .tx_buf = reg, .len = reg_size, },
{ .tx_buf = val, .len = val_size, }, };
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
spi_message_add_tail(&t[2], &m);
return spi_sync(spi, &m);
}
static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct mcp23s08 *mcp = context;
struct spi_device *spi = to_spi_device(mcp->dev);
u8 tx[2];
if (reg_size != 1)
return -EINVAL;
tx[0] = mcp->addr | 0x01;
tx[1] = *((u8 *) reg);
return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
}
static const struct regmap_bus mcp23sxx_spi_regmap = {
.write = mcp23sxx_spi_write,
.gather_write = mcp23sxx_spi_gather_write,
.read = mcp23sxx_spi_read,
};
static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
unsigned int addr, unsigned int type)
{
const struct regmap_config *config;
struct regmap_config *copy;
const char *name;
switch (type) {
case MCP_TYPE_S08:
mcp->reg_shift = 0;
mcp->chip.ngpio = 8;
mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d", addr);
config = &mcp23x08_regmap;
name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
break;
case MCP_TYPE_S17:
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d", addr);
config = &mcp23x17_regmap;
name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
break;
case MCP_TYPE_S18:
mcp->reg_shift = 1;
mcp->chip.ngpio = 16;
mcp->chip.label = "mcp23s18";
config = &mcp23x17_regmap;
name = config->name;
break;
default:
dev_err(dev, "invalid device type (%d)\n", type);
return -EINVAL;
}
copy = devm_kmemdup(dev, &config, sizeof(config), GFP_KERNEL);
if (!copy)
return -ENOMEM;
copy->name = name;
mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);
if (IS_ERR(mcp->regmap))
return PTR_ERR(mcp->regmap);
return 0;
}
static int mcp23s08_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct mcp23s08_driver_data *data;
unsigned long spi_present_mask;
const void *match;
unsigned int addr;
unsigned int ngpio = 0;
int chips;
int type;
int ret;
u32 v;
match = device_get_match_data(dev);
if (match)
type = (int)(uintptr_t)match;
else
type = spi_get_device_id(spi)->driver_data;
ret = device_property_read_u32(dev, "microchip,spi-present-mask", &v);
if (ret) {
ret = device_property_read_u32(dev, "mcp,spi-present-mask", &v);
if (ret) {
dev_err(dev, "missing spi-present-mask");
return ret;
}
}
spi_present_mask = v;
if (!spi_present_mask || spi_present_mask >= BIT(MCP_MAX_DEV_PER_CS)) {
dev_err(dev, "invalid spi-present-mask");
return -ENODEV;
}
chips = hweight_long(spi_present_mask);
data = devm_kzalloc(dev, struct_size(data, chip, chips), GFP_KERNEL);
if (!data)
return -ENOMEM;
spi_set_drvdata(spi, data);
for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
data->mcp[addr] = &data->chip[--chips];
data->mcp[addr]->irq = spi->irq;
ret = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, type);
if (ret)
return ret;
data->mcp[addr]->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
"mcp23xxx-pinctrl.%d",
addr);
if (!data->mcp[addr]->pinctrl_desc.name)
return -ENOMEM;
ret = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 | (addr << 1), type, -1);
if (ret < 0)
return ret;
ngpio += data->mcp[addr]->chip.ngpio;
}
data->ngpio = ngpio;
return 0;
}
static const struct spi_device_id mcp23s08_ids[] = {
{ "mcp23s08", MCP_TYPE_S08 },
{ "mcp23s17", MCP_TYPE_S17 },
{ "mcp23s18", MCP_TYPE_S18 },
{ }
};
MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
static const struct of_device_id mcp23s08_spi_of_match[] = {
{
.compatible = "microchip,mcp23s08",
.data = (void *) MCP_TYPE_S08,
},
{
.compatible = "microchip,mcp23s17",
.data = (void *) MCP_TYPE_S17,
},
{
.compatible = "microchip,mcp23s18",
.data = (void *) MCP_TYPE_S18,
},
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
{
.compatible = "mcp,mcp23s08",
.data = (void *) MCP_TYPE_S08,
},
{
.compatible = "mcp,mcp23s17",
.data = (void *) MCP_TYPE_S17,
},
{ }
};
MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
static struct spi_driver mcp23s08_driver = {
.probe = mcp23s08_probe,
.id_table = mcp23s08_ids,
.driver = {
.name = "mcp23s08",
.of_match_table = mcp23s08_spi_of_match,
},
};
static int __init mcp23s08_spi_init(void)
{
return spi_register_driver(&mcp23s08_driver);
}
/*
* Register after SPI postcore initcall and before
* subsys initcalls that may rely on these GPIOs.
*/
subsys_initcall(mcp23s08_spi_init);
static void mcp23s08_spi_exit(void)
{
spi_unregister_driver(&mcp23s08_driver);
}
module_exit(mcp23s08_spi_exit);
MODULE_LICENSE("GPL");