![Linus Torvalds](/assets/img/avatar_default.png)
Core: - When a gpio_chip request GPIOs from itself, it can now fully control the line characteristics, both machine and consumer flags. This makes a lot of sense, but took some time before I figured out that this is how it has to work. - Several smallish documentation fixes. New drivers: - The PCA953x driver now supports the TI TCA9539. - The DaVinci driver now supports the K3 AM654 SoCs. Driver improvements: - Major overhaul and hardening of the OMAP driver by Russell King. - Starting to move some drivers to the new API passing irq_chip along with the gpio_chip when adding the gpio_chip instead of adding it separately. Unrelated: - Delete the FMC subsystem. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEElDRnuGcz/wPCXQWMQRCzN7AZXXMFAl0i7gEACgkQQRCzN7AZ XXOeUA/+JKyI2zebTWBcgtxhn6VQCufMCtFmQl2JkEcy4pT7aBJcGWqFQCBW2Szf VTtqc8nNa90SZoOzsNbkeQgRjNKGZruMbh0ARUPcW4v3ZJHtUNUEDLTo8c3iyTgS 9k/FTeaTLt4WSZujeAO0O7G4KNnOOlTKLh58dr0PmXUR+0v+fbMhcJqJ9ABueV+V qENdpkTuG1ZcvzgLhBBEXdt3Plw9ICLWmPXtwY+784ewucVPbyQX7jV4+bBZ25fL DerCuMIgL5vRWWdiFO6/Jp603rHzZpTnjLJJocXUFiD6zA5rvU2jTWxsnUttjisg 8cTLMyQspsDvBxhEhCJVTuIKotbKH900TSaz+vx20W72/A1euy4y6uVi8FGZo4Ww KDkzB7anwHyEFKGnlYgHzDrfctgZrhQoyFz808DQRYg1JseZB5oGVDvScrPBD43j nbNDd8gwG4yp3tFnDx9xjIwQy3Ax4d510rAZyUN2801IlbA1bueq4t6Z2cCucWzX XA1gCKlXe4BUeitRAoZtqZNZG1ymEysW4jXy1V8xrwtAf8+QSN+xO98akz3VpnQL ae9q+HtF76fDBY1xFSXT37Ma3+4OR2vMF9QWuo4TCb9j1cL7llf8ZxtUq9LEHbDu erKLSSnwSFmqJNGSEA5SulGOCR/tRPkClngE9x0XEM6gOD+bs6E= =8zSV -----END PGP SIGNATURE----- Merge tag 'gpio-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This is the big slew of GPIO changes for the v5.3 kernel cycle. This is mostly incremental work this time. Three important things: - The FMC subsystem is deleted through my tree. This happens through GPIO as its demise was discussed in relation to a patch decoupling its GPIO implementation from the standard way of handling GPIO. As it turns out, that is not the only subsystem it reimplements and the authors think it is better do scratch it and start over using the proper kernel subsystems than try to polish the rust shiny. See the commit (ACKed by the maintainers) for details. - Arnd made a small devres patch that was ACKed by Greg and goes into the device core. - SPDX header change colissions may happen, because at times I've seen that quite a lot changed during the -rc:s in regards to SPDX. (It is good stuff, tglx has me convinced, and it is worth the occasional pain.) Apart from this is is nothing controversial or problematic. Summary: Core: - When a gpio_chip request GPIOs from itself, it can now fully control the line characteristics, both machine and consumer flags. This makes a lot of sense, but took some time before I figured out that this is how it has to work. - Several smallish documentation fixes. New drivers: - The PCA953x driver now supports the TI TCA9539. - The DaVinci driver now supports the K3 AM654 SoCs. Driver improvements: - Major overhaul and hardening of the OMAP driver by Russell King. - Starting to move some drivers to the new API passing irq_chip along with the gpio_chip when adding the gpio_chip instead of adding it separately. Unrelated: - Delete the FMC subsystem" * tag 'gpio-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (87 commits) Revert "gpio: tegra: Clean-up debugfs initialisation" gpiolib: Use spinlock_t instead of struct spinlock gpio: stp-xway: allow compile-testing gpio: stp-xway: get rid of the #include <lantiq_soc.h> dependency gpio: stp-xway: improve module clock error handling gpio: stp-xway: simplify error handling in xway_stp_probe() gpiolib: Clarify use of non-sleeping functions gpiolib: Fix references to gpiod_[gs]et_*value_cansleep() variants gpiolib: Document new gpio_chip.init_valid_mask field Documentation: gpio: Fix reference to gpiod_get_array() gpio: pl061: drop duplicate printing of device name gpio: altera: Pass irqchip when adding gpiochip gpio: siox: Use devm_ managed gpiochip gpio: siox: Add struct device *dev helper variable gpio: siox: Pass irqchip when adding gpiochip drivers: gpio: amd-fch: make resource struct const devres: allow const resource arguments gpio: ath79: Pass irqchip when adding gpiochip gpio: tegra: Clean-up debugfs initialisation gpio: siox: Switch to IRQ_TYPE_NONE ...
1224 lines
32 KiB
C
1224 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* PCA953x 4/8/16/24/40 bit I/O ports
|
|
*
|
|
* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
|
|
* Copyright (C) 2007 Marvell International Ltd.
|
|
*
|
|
* Derived from drivers/i2c/chips/pca9539.c
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_data/pca953x.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
#define PCA953X_INPUT 0x00
|
|
#define PCA953X_OUTPUT 0x01
|
|
#define PCA953X_INVERT 0x02
|
|
#define PCA953X_DIRECTION 0x03
|
|
|
|
#define REG_ADDR_MASK 0x3f
|
|
#define REG_ADDR_EXT 0x40
|
|
#define REG_ADDR_AI 0x80
|
|
|
|
#define PCA957X_IN 0x00
|
|
#define PCA957X_INVRT 0x01
|
|
#define PCA957X_BKEN 0x02
|
|
#define PCA957X_PUPD 0x03
|
|
#define PCA957X_CFG 0x04
|
|
#define PCA957X_OUT 0x05
|
|
#define PCA957X_MSK 0x06
|
|
#define PCA957X_INTS 0x07
|
|
|
|
#define PCAL953X_OUT_STRENGTH 0x20
|
|
#define PCAL953X_IN_LATCH 0x22
|
|
#define PCAL953X_PULL_EN 0x23
|
|
#define PCAL953X_PULL_SEL 0x24
|
|
#define PCAL953X_INT_MASK 0x25
|
|
#define PCAL953X_INT_STAT 0x26
|
|
#define PCAL953X_OUT_CONF 0x27
|
|
|
|
#define PCAL6524_INT_EDGE 0x28
|
|
#define PCAL6524_INT_CLR 0x2a
|
|
#define PCAL6524_IN_STATUS 0x2b
|
|
#define PCAL6524_OUT_INDCONF 0x2c
|
|
#define PCAL6524_DEBOUNCE 0x2d
|
|
|
|
#define PCA_GPIO_MASK 0x00FF
|
|
|
|
#define PCAL_GPIO_MASK 0x1f
|
|
#define PCAL_PINCTRL_MASK 0x60
|
|
|
|
#define PCA_INT 0x0100
|
|
#define PCA_PCAL 0x0200
|
|
#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
|
|
#define PCA953X_TYPE 0x1000
|
|
#define PCA957X_TYPE 0x2000
|
|
#define PCA_TYPE_MASK 0xF000
|
|
|
|
#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
|
|
|
|
static const struct i2c_device_id pca953x_id[] = {
|
|
{ "pca6416", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9536", 4 | PCA953X_TYPE, },
|
|
{ "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca9556", 8 | PCA953X_TYPE, },
|
|
{ "pca9557", 8 | PCA953X_TYPE, },
|
|
{ "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
|
|
{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
|
|
{ "pca9698", 40 | PCA953X_TYPE, },
|
|
|
|
{ "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
|
|
{ "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
|
|
{ "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
|
|
|
|
{ "max7310", 8 | PCA953X_TYPE, },
|
|
{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "max7315", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "max7318", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
|
|
{ "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
|
|
{ "tca9554", 8 | PCA953X_TYPE | PCA_INT, },
|
|
{ "xra1202", 8 | PCA953X_TYPE },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pca953x_id);
|
|
|
|
static const struct acpi_device_id pca953x_acpi_ids[] = {
|
|
{ "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
|
|
|
|
#define MAX_BANK 5
|
|
#define BANK_SZ 8
|
|
|
|
#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
|
|
|
|
struct pca953x_reg_config {
|
|
int direction;
|
|
int output;
|
|
int input;
|
|
int invert;
|
|
};
|
|
|
|
static const struct pca953x_reg_config pca953x_regs = {
|
|
.direction = PCA953X_DIRECTION,
|
|
.output = PCA953X_OUTPUT,
|
|
.input = PCA953X_INPUT,
|
|
.invert = PCA953X_INVERT,
|
|
};
|
|
|
|
static const struct pca953x_reg_config pca957x_regs = {
|
|
.direction = PCA957X_CFG,
|
|
.output = PCA957X_OUT,
|
|
.input = PCA957X_IN,
|
|
.invert = PCA957X_INVRT,
|
|
};
|
|
|
|
struct pca953x_chip {
|
|
unsigned gpio_start;
|
|
struct mutex i2c_lock;
|
|
struct regmap *regmap;
|
|
|
|
#ifdef CONFIG_GPIO_PCA953X_IRQ
|
|
struct mutex irq_lock;
|
|
u8 irq_mask[MAX_BANK];
|
|
u8 irq_stat[MAX_BANK];
|
|
u8 irq_trig_raise[MAX_BANK];
|
|
u8 irq_trig_fall[MAX_BANK];
|
|
struct irq_chip irq_chip;
|
|
#endif
|
|
atomic_t wakeup_path;
|
|
|
|
struct i2c_client *client;
|
|
struct gpio_chip gpio_chip;
|
|
const char *const *names;
|
|
unsigned long driver_data;
|
|
struct regulator *regulator;
|
|
|
|
const struct pca953x_reg_config *regs;
|
|
};
|
|
|
|
static int pca953x_bank_shift(struct pca953x_chip *chip)
|
|
{
|
|
return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
|
|
}
|
|
|
|
#define PCA953x_BANK_INPUT BIT(0)
|
|
#define PCA953x_BANK_OUTPUT BIT(1)
|
|
#define PCA953x_BANK_POLARITY BIT(2)
|
|
#define PCA953x_BANK_CONFIG BIT(3)
|
|
|
|
#define PCA957x_BANK_INPUT BIT(0)
|
|
#define PCA957x_BANK_POLARITY BIT(1)
|
|
#define PCA957x_BANK_BUSHOLD BIT(2)
|
|
#define PCA957x_BANK_CONFIG BIT(4)
|
|
#define PCA957x_BANK_OUTPUT BIT(5)
|
|
|
|
#define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
|
|
#define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
|
|
#define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
|
|
#define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
|
|
#define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
|
|
|
|
/*
|
|
* We care about the following registers:
|
|
* - Standard set, below 0x40, each port can be replicated up to 8 times
|
|
* - PCA953x standard
|
|
* Input port 0x00 + 0 * bank_size R
|
|
* Output port 0x00 + 1 * bank_size RW
|
|
* Polarity Inversion port 0x00 + 2 * bank_size RW
|
|
* Configuration port 0x00 + 3 * bank_size RW
|
|
* - PCA957x with mixed up registers
|
|
* Input port 0x00 + 0 * bank_size R
|
|
* Polarity Inversion port 0x00 + 1 * bank_size RW
|
|
* Bus hold port 0x00 + 2 * bank_size RW
|
|
* Configuration port 0x00 + 4 * bank_size RW
|
|
* Output port 0x00 + 5 * bank_size RW
|
|
*
|
|
* - Extended set, above 0x40, often chip specific.
|
|
* - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
|
|
* Input latch register 0x40 + 2 * bank_size RW
|
|
* Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW
|
|
* Pull-up/pull-down select reg 0x40 + 4 * bank_size RW
|
|
* Interrupt mask register 0x40 + 5 * bank_size RW
|
|
* Interrupt status register 0x40 + 6 * bank_size R
|
|
*
|
|
* - Registers with bit 0x80 set, the AI bit
|
|
* The bit is cleared and the registers fall into one of the
|
|
* categories above.
|
|
*/
|
|
|
|
static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
|
|
u32 checkbank)
|
|
{
|
|
int bank_shift = pca953x_bank_shift(chip);
|
|
int bank = (reg & REG_ADDR_MASK) >> bank_shift;
|
|
int offset = reg & (BIT(bank_shift) - 1);
|
|
|
|
/* Special PCAL extended register check. */
|
|
if (reg & REG_ADDR_EXT) {
|
|
if (!(chip->driver_data & PCA_PCAL))
|
|
return false;
|
|
bank += 8;
|
|
}
|
|
|
|
/* Register is not in the matching bank. */
|
|
if (!(BIT(bank) & checkbank))
|
|
return false;
|
|
|
|
/* Register is not within allowed range of bank. */
|
|
if (offset >= NBANK(chip))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool pca953x_readable_register(struct device *dev, unsigned int reg)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
u32 bank;
|
|
|
|
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
|
|
bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT |
|
|
PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG;
|
|
} else {
|
|
bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT |
|
|
PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG |
|
|
PCA957x_BANK_BUSHOLD;
|
|
}
|
|
|
|
if (chip->driver_data & PCA_PCAL) {
|
|
bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
|
|
PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
|
|
PCAL9xxx_BANK_IRQ_STAT;
|
|
}
|
|
|
|
return pca953x_check_register(chip, reg, bank);
|
|
}
|
|
|
|
static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
u32 bank;
|
|
|
|
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
|
|
bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY |
|
|
PCA953x_BANK_CONFIG;
|
|
} else {
|
|
bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY |
|
|
PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD;
|
|
}
|
|
|
|
if (chip->driver_data & PCA_PCAL)
|
|
bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
|
|
PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
|
|
|
|
return pca953x_check_register(chip, reg, bank);
|
|
}
|
|
|
|
static bool pca953x_volatile_register(struct device *dev, unsigned int reg)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
u32 bank;
|
|
|
|
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
|
|
bank = PCA953x_BANK_INPUT;
|
|
else
|
|
bank = PCA957x_BANK_INPUT;
|
|
|
|
if (chip->driver_data & PCA_PCAL)
|
|
bank |= PCAL9xxx_BANK_IRQ_STAT;
|
|
|
|
return pca953x_check_register(chip, reg, bank);
|
|
}
|
|
|
|
static const struct regmap_config pca953x_i2c_regmap = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
|
|
.readable_reg = pca953x_readable_register,
|
|
.writeable_reg = pca953x_writeable_register,
|
|
.volatile_reg = pca953x_volatile_register,
|
|
|
|
.cache_type = REGCACHE_RBTREE,
|
|
/* REVISIT: should be 0x7f but some 24 bit chips use REG_ADDR_AI */
|
|
.max_register = 0xff,
|
|
};
|
|
|
|
static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off,
|
|
bool write, bool addrinc)
|
|
{
|
|
int bank_shift = pca953x_bank_shift(chip);
|
|
int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
|
|
int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
|
|
u8 regaddr = pinctrl | addr | (off / BANK_SZ);
|
|
|
|
/* Single byte read doesn't need AI bit set. */
|
|
if (!addrinc)
|
|
return regaddr;
|
|
|
|
/* Chips with 24 and more GPIOs always support Auto Increment */
|
|
if (write && NBANK(chip) > 2)
|
|
regaddr |= REG_ADDR_AI;
|
|
|
|
/* PCA9575 needs address-increment on multi-byte writes */
|
|
if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
|
|
regaddr |= REG_ADDR_AI;
|
|
|
|
return regaddr;
|
|
}
|
|
|
|
static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
|
|
{
|
|
u8 regaddr = pca953x_recalc_addr(chip, reg, 0, true, true);
|
|
int ret;
|
|
|
|
ret = regmap_bulk_write(chip->regmap, regaddr, val, NBANK(chip));
|
|
if (ret < 0) {
|
|
dev_err(&chip->client->dev, "failed writing register\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
|
|
{
|
|
u8 regaddr = pca953x_recalc_addr(chip, reg, 0, false, true);
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(chip->regmap, regaddr, val, NBANK(chip));
|
|
if (ret < 0) {
|
|
dev_err(&chip->client->dev, "failed reading register\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
|
|
true, false);
|
|
u8 bit = BIT(off % BANK_SZ);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
|
|
mutex_unlock(&chip->i2c_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int pca953x_gpio_direction_output(struct gpio_chip *gc,
|
|
unsigned off, int val)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
|
|
true, false);
|
|
u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
|
|
true, false);
|
|
u8 bit = BIT(off % BANK_SZ);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
/* set output level */
|
|
ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
/* then direction */
|
|
ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
|
|
exit:
|
|
mutex_unlock(&chip->i2c_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 inreg = pca953x_recalc_addr(chip, chip->regs->input, off,
|
|
true, false);
|
|
u8 bit = BIT(off % BANK_SZ);
|
|
u32 reg_val;
|
|
int ret;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
ret = regmap_read(chip->regmap, inreg, ®_val);
|
|
mutex_unlock(&chip->i2c_lock);
|
|
if (ret < 0) {
|
|
/* NOTE: diagnostic already emitted; that's all we should
|
|
* do unless gpio_*_value_cansleep() calls become different
|
|
* from their nonsleeping siblings (and report faults).
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
return !!(reg_val & bit);
|
|
}
|
|
|
|
static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
|
|
true, false);
|
|
u8 bit = BIT(off % BANK_SZ);
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
|
|
mutex_unlock(&chip->i2c_lock);
|
|
}
|
|
|
|
static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
|
|
true, false);
|
|
u8 bit = BIT(off % BANK_SZ);
|
|
u32 reg_val;
|
|
int ret;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
ret = regmap_read(chip->regmap, dirreg, ®_val);
|
|
mutex_unlock(&chip->i2c_lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return !!(reg_val & bit);
|
|
}
|
|
|
|
static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
|
|
unsigned long *mask, unsigned long *bits)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
unsigned int bank_mask, bank_val;
|
|
int bank;
|
|
u8 reg_val[MAX_BANK];
|
|
int ret;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
for (bank = 0; bank < NBANK(chip); bank++) {
|
|
bank_mask = mask[bank / sizeof(*mask)] >>
|
|
((bank % sizeof(*mask)) * 8);
|
|
if (bank_mask) {
|
|
bank_val = bits[bank / sizeof(*bits)] >>
|
|
((bank % sizeof(*bits)) * 8);
|
|
bank_val &= bank_mask;
|
|
reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
|
|
}
|
|
}
|
|
|
|
pca953x_write_regs(chip, chip->regs->output, reg_val);
|
|
exit:
|
|
mutex_unlock(&chip->i2c_lock);
|
|
}
|
|
|
|
static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
|
|
unsigned int offset,
|
|
unsigned long config)
|
|
{
|
|
u8 pull_en_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_EN, offset,
|
|
true, false);
|
|
u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset,
|
|
true, false);
|
|
u8 bit = BIT(offset % BANK_SZ);
|
|
int ret;
|
|
|
|
/*
|
|
* pull-up/pull-down configuration requires PCAL extended
|
|
* registers
|
|
*/
|
|
if (!(chip->driver_data & PCA_PCAL))
|
|
return -ENOTSUPP;
|
|
|
|
mutex_lock(&chip->i2c_lock);
|
|
|
|
/* Disable pull-up/pull-down */
|
|
ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
/* Configure pull-up/pull-down */
|
|
if (config == PIN_CONFIG_BIAS_PULL_UP)
|
|
ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
|
|
else if (config == PIN_CONFIG_BIAS_PULL_DOWN)
|
|
ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
/* Enable pull-up/pull-down */
|
|
ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
|
|
|
|
exit:
|
|
mutex_unlock(&chip->i2c_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
|
|
unsigned long config)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
|
|
switch (config) {
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
return pca953x_gpio_set_pull_up_down(chip, offset, config);
|
|
default:
|
|
return -ENOTSUPP;
|
|
}
|
|
}
|
|
|
|
static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
|
|
{
|
|
struct gpio_chip *gc;
|
|
|
|
gc = &chip->gpio_chip;
|
|
|
|
gc->direction_input = pca953x_gpio_direction_input;
|
|
gc->direction_output = pca953x_gpio_direction_output;
|
|
gc->get = pca953x_gpio_get_value;
|
|
gc->set = pca953x_gpio_set_value;
|
|
gc->get_direction = pca953x_gpio_get_direction;
|
|
gc->set_multiple = pca953x_gpio_set_multiple;
|
|
gc->set_config = pca953x_gpio_set_config;
|
|
gc->can_sleep = true;
|
|
|
|
gc->base = chip->gpio_start;
|
|
gc->ngpio = gpios;
|
|
gc->label = dev_name(&chip->client->dev);
|
|
gc->parent = &chip->client->dev;
|
|
gc->owner = THIS_MODULE;
|
|
gc->names = chip->names;
|
|
}
|
|
|
|
#ifdef CONFIG_GPIO_PCA953X_IRQ
|
|
static void pca953x_irq_mask(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
|
|
chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
|
|
}
|
|
|
|
static void pca953x_irq_unmask(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
|
|
chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
|
|
}
|
|
|
|
static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
|
|
if (on)
|
|
atomic_inc(&chip->wakeup_path);
|
|
else
|
|
atomic_dec(&chip->wakeup_path);
|
|
|
|
return irq_set_irq_wake(chip->client->irq, on);
|
|
}
|
|
|
|
static void pca953x_irq_bus_lock(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
|
|
mutex_lock(&chip->irq_lock);
|
|
}
|
|
|
|
static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 new_irqs;
|
|
int level, i;
|
|
u8 invert_irq_mask[MAX_BANK];
|
|
int reg_direction[MAX_BANK];
|
|
|
|
regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
|
|
NBANK(chip));
|
|
|
|
if (chip->driver_data & PCA_PCAL) {
|
|
/* Enable latch on interrupt-enabled inputs */
|
|
pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
|
|
|
|
for (i = 0; i < NBANK(chip); i++)
|
|
invert_irq_mask[i] = ~chip->irq_mask[i];
|
|
|
|
/* Unmask enabled interrupts */
|
|
pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
|
|
}
|
|
|
|
/* Look for any newly setup interrupt */
|
|
for (i = 0; i < NBANK(chip); i++) {
|
|
new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
|
|
new_irqs &= reg_direction[i];
|
|
|
|
while (new_irqs) {
|
|
level = __ffs(new_irqs);
|
|
pca953x_gpio_direction_input(&chip->gpio_chip,
|
|
level + (BANK_SZ * i));
|
|
new_irqs &= ~(1 << level);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&chip->irq_lock);
|
|
}
|
|
|
|
static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
int bank_nb = d->hwirq / BANK_SZ;
|
|
u8 mask = 1 << (d->hwirq % BANK_SZ);
|
|
|
|
if (!(type & IRQ_TYPE_EDGE_BOTH)) {
|
|
dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
|
|
d->irq, type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (type & IRQ_TYPE_EDGE_FALLING)
|
|
chip->irq_trig_fall[bank_nb] |= mask;
|
|
else
|
|
chip->irq_trig_fall[bank_nb] &= ~mask;
|
|
|
|
if (type & IRQ_TYPE_EDGE_RISING)
|
|
chip->irq_trig_raise[bank_nb] |= mask;
|
|
else
|
|
chip->irq_trig_raise[bank_nb] &= ~mask;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pca953x_irq_shutdown(struct irq_data *d)
|
|
{
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 mask = 1 << (d->hwirq % BANK_SZ);
|
|
|
|
chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;
|
|
chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask;
|
|
}
|
|
|
|
static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
|
|
{
|
|
u8 cur_stat[MAX_BANK];
|
|
u8 old_stat[MAX_BANK];
|
|
bool pending_seen = false;
|
|
bool trigger_seen = false;
|
|
u8 trigger[MAX_BANK];
|
|
int reg_direction[MAX_BANK];
|
|
int ret, i;
|
|
|
|
if (chip->driver_data & PCA_PCAL) {
|
|
/* Read the current interrupt status from the device */
|
|
ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
|
|
if (ret)
|
|
return false;
|
|
|
|
/* Check latched inputs and clear interrupt status */
|
|
ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
|
|
if (ret)
|
|
return false;
|
|
|
|
for (i = 0; i < NBANK(chip); i++) {
|
|
/* Apply filter for rising/falling edge selection */
|
|
pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
|
|
(cur_stat[i] & chip->irq_trig_raise[i]);
|
|
pending[i] &= trigger[i];
|
|
if (pending[i])
|
|
pending_seen = true;
|
|
}
|
|
|
|
return pending_seen;
|
|
}
|
|
|
|
ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
|
|
if (ret)
|
|
return false;
|
|
|
|
/* Remove output pins from the equation */
|
|
regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
|
|
NBANK(chip));
|
|
for (i = 0; i < NBANK(chip); i++)
|
|
cur_stat[i] &= reg_direction[i];
|
|
|
|
memcpy(old_stat, chip->irq_stat, NBANK(chip));
|
|
|
|
for (i = 0; i < NBANK(chip); i++) {
|
|
trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
|
|
if (trigger[i])
|
|
trigger_seen = true;
|
|
}
|
|
|
|
if (!trigger_seen)
|
|
return false;
|
|
|
|
memcpy(chip->irq_stat, cur_stat, NBANK(chip));
|
|
|
|
for (i = 0; i < NBANK(chip); i++) {
|
|
pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
|
|
(cur_stat[i] & chip->irq_trig_raise[i]);
|
|
pending[i] &= trigger[i];
|
|
if (pending[i])
|
|
pending_seen = true;
|
|
}
|
|
|
|
return pending_seen;
|
|
}
|
|
|
|
static irqreturn_t pca953x_irq_handler(int irq, void *devid)
|
|
{
|
|
struct pca953x_chip *chip = devid;
|
|
u8 pending[MAX_BANK];
|
|
u8 level;
|
|
unsigned nhandled = 0;
|
|
int i;
|
|
|
|
if (!pca953x_irq_pending(chip, pending))
|
|
return IRQ_NONE;
|
|
|
|
for (i = 0; i < NBANK(chip); i++) {
|
|
while (pending[i]) {
|
|
level = __ffs(pending[i]);
|
|
handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain,
|
|
level + (BANK_SZ * i)));
|
|
pending[i] &= ~(1 << level);
|
|
nhandled++;
|
|
}
|
|
}
|
|
|
|
return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
|
|
static int pca953x_irq_setup(struct pca953x_chip *chip,
|
|
int irq_base)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
struct irq_chip *irq_chip = &chip->irq_chip;
|
|
int reg_direction[MAX_BANK];
|
|
int ret, i;
|
|
|
|
if (!client->irq)
|
|
return 0;
|
|
|
|
if (irq_base == -1)
|
|
return 0;
|
|
|
|
if (!(chip->driver_data & PCA_INT))
|
|
return 0;
|
|
|
|
ret = pca953x_read_regs(chip, chip->regs->input, chip->irq_stat);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* There is no way to know which GPIO line generated the
|
|
* interrupt. We have to rely on the previous read for
|
|
* this purpose.
|
|
*/
|
|
regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
|
|
NBANK(chip));
|
|
for (i = 0; i < NBANK(chip); i++)
|
|
chip->irq_stat[i] &= reg_direction[i];
|
|
mutex_init(&chip->irq_lock);
|
|
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, pca953x_irq_handler,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT |
|
|
IRQF_SHARED,
|
|
dev_name(&client->dev), chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "failed to request irq %d\n",
|
|
client->irq);
|
|
return ret;
|
|
}
|
|
|
|
irq_chip->name = dev_name(&chip->client->dev);
|
|
irq_chip->irq_mask = pca953x_irq_mask;
|
|
irq_chip->irq_unmask = pca953x_irq_unmask;
|
|
irq_chip->irq_set_wake = pca953x_irq_set_wake;
|
|
irq_chip->irq_bus_lock = pca953x_irq_bus_lock;
|
|
irq_chip->irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock;
|
|
irq_chip->irq_set_type = pca953x_irq_set_type;
|
|
irq_chip->irq_shutdown = pca953x_irq_shutdown;
|
|
|
|
ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, irq_chip,
|
|
irq_base, handle_simple_irq,
|
|
IRQ_TYPE_NONE);
|
|
if (ret) {
|
|
dev_err(&client->dev,
|
|
"could not connect irqchip to gpiochip\n");
|
|
return ret;
|
|
}
|
|
|
|
gpiochip_set_nested_irqchip(&chip->gpio_chip, irq_chip, client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else /* CONFIG_GPIO_PCA953X_IRQ */
|
|
static int pca953x_irq_setup(struct pca953x_chip *chip,
|
|
int irq_base)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
|
|
if (client->irq && irq_base != -1 && (chip->driver_data & PCA_INT))
|
|
dev_warn(&client->dev, "interrupt support not compiled in\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
|
|
{
|
|
int ret;
|
|
u8 val[MAX_BANK];
|
|
|
|
ret = regcache_sync_region(chip->regmap, chip->regs->output,
|
|
chip->regs->output + NBANK(chip));
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
ret = regcache_sync_region(chip->regmap, chip->regs->direction,
|
|
chip->regs->direction + NBANK(chip));
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
/* set platform specific polarity inversion */
|
|
if (invert)
|
|
memset(val, 0xFF, NBANK(chip));
|
|
else
|
|
memset(val, 0, NBANK(chip));
|
|
|
|
ret = pca953x_write_regs(chip, chip->regs->invert, val);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
|
|
{
|
|
int ret;
|
|
u8 val[MAX_BANK];
|
|
|
|
ret = device_pca95xx_init(chip, invert);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* To enable register 6, 7 to control pull up and pull down */
|
|
memset(val, 0x02, NBANK(chip));
|
|
ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id pca953x_dt_ids[];
|
|
|
|
static int pca953x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *i2c_id)
|
|
{
|
|
struct pca953x_platform_data *pdata;
|
|
struct pca953x_chip *chip;
|
|
int irq_base = 0;
|
|
int ret;
|
|
u32 invert = 0;
|
|
struct regulator *reg;
|
|
|
|
chip = devm_kzalloc(&client->dev,
|
|
sizeof(struct pca953x_chip), GFP_KERNEL);
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
|
|
pdata = dev_get_platdata(&client->dev);
|
|
if (pdata) {
|
|
irq_base = pdata->irq_base;
|
|
chip->gpio_start = pdata->gpio_base;
|
|
invert = pdata->invert;
|
|
chip->names = pdata->names;
|
|
} else {
|
|
struct gpio_desc *reset_gpio;
|
|
|
|
chip->gpio_start = -1;
|
|
irq_base = 0;
|
|
|
|
/*
|
|
* See if we need to de-assert a reset pin.
|
|
*
|
|
* There is no known ACPI-enabled platforms that are
|
|
* using "reset" GPIO. Otherwise any of those platform
|
|
* must use _DSD method with corresponding property.
|
|
*/
|
|
reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
|
|
GPIOD_OUT_LOW);
|
|
if (IS_ERR(reset_gpio))
|
|
return PTR_ERR(reset_gpio);
|
|
}
|
|
|
|
chip->client = client;
|
|
|
|
reg = devm_regulator_get(&client->dev, "vcc");
|
|
if (IS_ERR(reg)) {
|
|
ret = PTR_ERR(reg);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&client->dev, "reg get err: %d\n", ret);
|
|
return ret;
|
|
}
|
|
ret = regulator_enable(reg);
|
|
if (ret) {
|
|
dev_err(&client->dev, "reg en err: %d\n", ret);
|
|
return ret;
|
|
}
|
|
chip->regulator = reg;
|
|
|
|
if (i2c_id) {
|
|
chip->driver_data = i2c_id->driver_data;
|
|
} else {
|
|
const struct acpi_device_id *acpi_id;
|
|
struct device *dev = &client->dev;
|
|
|
|
chip->driver_data = (uintptr_t)of_device_get_match_data(dev);
|
|
if (!chip->driver_data) {
|
|
acpi_id = acpi_match_device(pca953x_acpi_ids, dev);
|
|
if (!acpi_id) {
|
|
ret = -ENODEV;
|
|
goto err_exit;
|
|
}
|
|
|
|
chip->driver_data = acpi_id->driver_data;
|
|
}
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
chip->regmap = devm_regmap_init_i2c(client, &pca953x_i2c_regmap);
|
|
if (IS_ERR(chip->regmap)) {
|
|
ret = PTR_ERR(chip->regmap);
|
|
goto err_exit;
|
|
}
|
|
|
|
regcache_mark_dirty(chip->regmap);
|
|
|
|
mutex_init(&chip->i2c_lock);
|
|
/*
|
|
* In case we have an i2c-mux controlled by a GPIO provided by an
|
|
* expander using the same driver higher on the device tree, read the
|
|
* i2c adapter nesting depth and use the retrieved value as lockdep
|
|
* subclass for chip->i2c_lock.
|
|
*
|
|
* REVISIT: This solution is not complete. It protects us from lockdep
|
|
* false positives when the expander controlling the i2c-mux is on
|
|
* a different level on the device tree, but not when it's on the same
|
|
* level on a different branch (in which case the subclass number
|
|
* would be the same).
|
|
*
|
|
* TODO: Once a correct solution is developed, a similar fix should be
|
|
* applied to all other i2c-controlled GPIO expanders (and potentially
|
|
* regmap-i2c).
|
|
*/
|
|
lockdep_set_subclass(&chip->i2c_lock,
|
|
i2c_adapter_depth(client->adapter));
|
|
|
|
/* initialize cached registers from their original values.
|
|
* we can't share this chip with another i2c master.
|
|
*/
|
|
pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
|
|
|
|
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
|
|
chip->regs = &pca953x_regs;
|
|
ret = device_pca95xx_init(chip, invert);
|
|
} else {
|
|
chip->regs = &pca957x_regs;
|
|
ret = device_pca957x_init(chip, invert);
|
|
}
|
|
if (ret)
|
|
goto err_exit;
|
|
|
|
ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
|
|
if (ret)
|
|
goto err_exit;
|
|
|
|
ret = pca953x_irq_setup(chip, irq_base);
|
|
if (ret)
|
|
goto err_exit;
|
|
|
|
if (pdata && pdata->setup) {
|
|
ret = pdata->setup(client, chip->gpio_chip.base,
|
|
chip->gpio_chip.ngpio, pdata->context);
|
|
if (ret < 0)
|
|
dev_warn(&client->dev, "setup failed, %d\n", ret);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_exit:
|
|
regulator_disable(chip->regulator);
|
|
return ret;
|
|
}
|
|
|
|
static int pca953x_remove(struct i2c_client *client)
|
|
{
|
|
struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
struct pca953x_chip *chip = i2c_get_clientdata(client);
|
|
int ret;
|
|
|
|
if (pdata && pdata->teardown) {
|
|
ret = pdata->teardown(client, chip->gpio_chip.base,
|
|
chip->gpio_chip.ngpio, pdata->context);
|
|
if (ret < 0)
|
|
dev_err(&client->dev, "%s failed, %d\n",
|
|
"teardown", ret);
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
regulator_disable(chip->regulator);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int pca953x_regcache_sync(struct device *dev)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
/*
|
|
* The ordering between direction and output is important,
|
|
* sync these registers first and only then sync the rest.
|
|
*/
|
|
ret = regcache_sync_region(chip->regmap, chip->regs->direction,
|
|
chip->regs->direction + NBANK(chip));
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regcache_sync_region(chip->regmap, chip->regs->output,
|
|
chip->regs->output + NBANK(chip));
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_GPIO_PCA953X_IRQ
|
|
if (chip->driver_data & PCA_PCAL) {
|
|
ret = regcache_sync_region(chip->regmap, PCAL953X_IN_LATCH,
|
|
PCAL953X_IN_LATCH + NBANK(chip));
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to sync INT latch registers: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regcache_sync_region(chip->regmap, PCAL953X_INT_MASK,
|
|
PCAL953X_INT_MASK + NBANK(chip));
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to sync INT mask registers: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca953x_suspend(struct device *dev)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
|
|
regcache_cache_only(chip->regmap, true);
|
|
|
|
if (atomic_read(&chip->wakeup_path))
|
|
device_set_wakeup_path(dev);
|
|
else
|
|
regulator_disable(chip->regulator);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca953x_resume(struct device *dev)
|
|
{
|
|
struct pca953x_chip *chip = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (!atomic_read(&chip->wakeup_path)) {
|
|
ret = regulator_enable(chip->regulator);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to enable regulator: %d\n", ret);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
regcache_cache_only(chip->regmap, false);
|
|
regcache_mark_dirty(chip->regmap);
|
|
ret = pca953x_regcache_sync(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regcache_sync(chip->regmap);
|
|
if (ret != 0) {
|
|
dev_err(dev, "Failed to restore register map: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* convenience to stop overlong match-table lines */
|
|
#define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
|
|
#define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
|
|
|
|
static const struct of_device_id pca953x_dt_ids[] = {
|
|
{ .compatible = "nxp,pca6416", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
|
|
{ .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
|
|
{ .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
|
|
{ .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
|
|
{ .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
|
|
{ .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
|
|
{ .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
|
|
{ .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
|
|
|
|
{ .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
|
|
{ .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
|
|
{ .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
|
|
|
|
{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
|
|
{ .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
|
|
|
|
{ .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
|
|
{ .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
|
|
{ .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
|
|
{ .compatible = "ti,tca9539", .data = OF_953X(16, PCA_INT), },
|
|
|
|
{ .compatible = "onnn,cat9554", .data = OF_953X( 8, PCA_INT), },
|
|
{ .compatible = "onnn,pca9654", .data = OF_953X( 8, PCA_INT), },
|
|
|
|
{ .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
|
|
|
|
static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume);
|
|
|
|
static struct i2c_driver pca953x_driver = {
|
|
.driver = {
|
|
.name = "pca953x",
|
|
.pm = &pca953x_pm_ops,
|
|
.of_match_table = pca953x_dt_ids,
|
|
.acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
|
|
},
|
|
.probe = pca953x_probe,
|
|
.remove = pca953x_remove,
|
|
.id_table = pca953x_id,
|
|
};
|
|
|
|
static int __init pca953x_init(void)
|
|
{
|
|
return i2c_add_driver(&pca953x_driver);
|
|
}
|
|
/* register after i2c postcore initcall and before
|
|
* subsys initcalls that may rely on these GPIOs
|
|
*/
|
|
subsys_initcall(pca953x_init);
|
|
|
|
static void __exit pca953x_exit(void)
|
|
{
|
|
i2c_del_driver(&pca953x_driver);
|
|
}
|
|
module_exit(pca953x_exit);
|
|
|
|
MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
|
|
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
|
|
MODULE_LICENSE("GPL");
|