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![Linus Torvalds](/assets/img/avatar_default.png)
Core infrastructural changes: - Support for natively single-ended GPIO driver stages. This means that if the hardware has registers to configure open drain or open source configuration, we use that rather than (as we did before) try to emulate it by switching the line to an input to get high impedance. This is also documented throughly in Documentation/gpio/driver.txt for those of you who did not understand one word of what I just wrote. - Start to do away with the unnecessarily complex and unitelligible ARCH_REQUIRE_GPIOLIB and ARCH_WANT_OPTIONAL_GPIOLIB, another evolutional artifact from the time when the GPIO subsystem was unmaintained. Archs can now just select GPIOLIB and be done with it, cleanups to arches will trickle in for the next kernel. Some minor archs ACKed the changes immediately so these are included in this pull request. - Advancing the use of the data pointer inside the GPIO device for storing driver data by switching the PowerPC, Super-H Unicore and a few other subarches or subsystem drivers in ALSA SoC, Input, serial, SSB, staging etc to use it. - The initialization now reads the input/output state of the GPIO lines, so that each GPIO descriptor knows - if this callback is implemented - whether the line is input or output. This also reflects nicely in userspace "lsgpio". - It is now possible to name GPIO producer names, line names, from the device tree. (Platform data has been supported for a while.) I bet we will get a similar mechanism for ACPI one of those days. This makes is possible to get sensible producer names for e.g. GPIO rails in "lsgpio" in userspace. New drivers: - New driver for the Loongson1. - The XLP driver now supports Broadcom Vulcan ARM64. - The IT87 driver now supports IT8620 and IT8628. - The PCA953X driver now supports Galileo Gen2. Driver improvements: - MCP23S08 was switched to use the gpiolib irqchip helpers and now also suppors level-triggered interrupts. - 74x164 and RCAR now supports the .set_multiple() callback - AMDPT was converted to use generic GPIO. - TC3589x, TPS65218, SX150X, F7188X, MENZ127, VX855, WM831X, WM8994 support the new single ended callback for open drain and in some cases open source. - Implement the .get_direction() callback for a few more drivers like PL061, Xgene. Cleanups: - Paul Gortmaker combed through the drivers and de-modularized those who are not really modules. - Move the GPIO poweroff DT bindings to the power subdir where they belong. - Rename gpio-generic.c to gpio-mmio.c, which is much more to the point. That's what it is handling, nothing more, nothing less. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJXOuJ5AAoJEEEQszewGV1zNXsQAII5wtkP69WRJ3goYBKg1dZN DkuLqZyVI4hCgRhptzUW10gDLHKKOCVubfetTJHSpyG/dWDJXPCyH6FHF+pW6lMX y+em8kAvWctKpaosy4EM7O55/IohW0/fNCTOfzfrUNivjydFuA2XwPUiPqC7111O DeKlC/t+W1JEvZTiKMi83pKq+9wqhiHmD0qxRHhV57S+MT8e7mdlSKOp7uUkKPkg LPlerXosnmeFjL2emuSnKl/tq8pOyruU6uaIGG/uwpbo2W86Dok9GY2GWkQ4pANT pDtprc4aJ/Clf6Q0CoKwQbmAozqTDeJo+Und9tRs2KuZRly2bWOcyVE0lyK+Y4s0 544LcKw2q6cB9ARZ6JExEVRJejPISGKMqo9TaHkyNSIJoiiatKYvNS4WVeFtTgbI W+1WfM1svPymNRqVPO1PMLV+3m9dalDH2WjtaFF21uCAQ/G0AuPEHjEDbbx0HIpb qrvWmYzZ97Rm/LdYROFRO53nEdCp2jh6c3n4/2kGYM8H0suvGxXZsB1g4i+Dm+B+ qKVTS282azlDuH9ohXeXizeb6atK6s8TC3Rmew97SmXDO00cUQzEQO/ZquRLHY9r n83afQ4OL2Z9yruAxAk7pCshVSyheOsHuFPuZ7bwPW31VMdoWNRkhnaTUXMjGfYg 3y39IHrCKWNMCCVM1iNl =z4d6 -----END PGP SIGNATURE----- Merge tag 'gpio-v4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This is the bulk of GPIO changes for kernel cycle v4.7: Core infrastructural changes: - Support for natively single-ended GPIO driver stages. This means that if the hardware has registers to configure open drain or open source configuration, we use that rather than (as we did before) try to emulate it by switching the line to an input to get high impedance. This is also documented throughly in Documentation/gpio/driver.txt for those of you who did not understand one word of what I just wrote. - Start to do away with the unnecessarily complex and unitelligible ARCH_REQUIRE_GPIOLIB and ARCH_WANT_OPTIONAL_GPIOLIB, another evolutional artifact from the time when the GPIO subsystem was unmaintained. Archs can now just select GPIOLIB and be done with it, cleanups to arches will trickle in for the next kernel. Some minor archs ACKed the changes immediately so these are included in this pull request. - Advancing the use of the data pointer inside the GPIO device for storing driver data by switching the PowerPC, Super-H Unicore and a few other subarches or subsystem drivers in ALSA SoC, Input, serial, SSB, staging etc to use it. - The initialization now reads the input/output state of the GPIO lines, so that each GPIO descriptor knows - if this callback is implemented - whether the line is input or output. This also reflects nicely in userspace "lsgpio". - It is now possible to name GPIO producer names, line names, from the device tree. (Platform data has been supported for a while). I bet we will get a similar mechanism for ACPI one of those days. This makes is possible to get sensible producer names for e.g. GPIO rails in "lsgpio" in userspace. New drivers: - New driver for the Loongson1. - The XLP driver now supports Broadcom Vulcan ARM64. - The IT87 driver now supports IT8620 and IT8628. - The PCA953X driver now supports Galileo Gen2. Driver improvements: - MCP23S08 was switched to use the gpiolib irqchip helpers and now also suppors level-triggered interrupts. - 74x164 and RCAR now supports the .set_multiple() callback - AMDPT was converted to use generic GPIO. - TC3589x, TPS65218, SX150X, F7188X, MENZ127, VX855, WM831X, WM8994 support the new single ended callback for open drain and in some cases open source. - Implement the .get_direction() callback for a few more drivers like PL061, Xgene. Cleanups: - Paul Gortmaker combed through the drivers and de-modularized those who are not really modules. - Move the GPIO poweroff DT bindings to the power subdir where they belong. - Rename gpio-generic.c to gpio-mmio.c, which is much more to the point. That's what it is handling, nothing more, nothing less" * tag 'gpio-v4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (126 commits) MIPS: do away with ARCH_[WANT_OPTIONAL|REQUIRE]_GPIOLIB gpio: zevio: make it explicitly non-modular gpio: timberdale: make it explicitly non-modular gpio: stmpe: make it explicitly non-modular gpio: sodaville: make it explicitly non-modular pinctrl: sh-pfc: Let gpio_chip.to_irq() return zero on error gpio: dwapb: Add ACPI device ID for DWAPB GPIO controller on X-Gene platforms gpio: dt-bindings: add wd,mbl-gpio bindings gpio: of: make it possible to name GPIO lines gpio: make gpiod_to_irq() return negative for NO_IRQ gpio: xgene: implement .get_direction() gpio: xgene: Enable ACPI support for X-Gene GFC GPIO driver gpio: tegra: Implement gpio_get_direction callback gpio: set up initial state from .get_direction() gpio: rename gpio-generic.c into gpio-mmio.c gpio: generic: fix GPIO_GENERIC_PLATFORM is set to module case gpio: dwapb: add gpio-signaled acpi event support gpio: dwapb: convert device node to fwnode gpio: dwapb: remove name from dwapb_port_property gpio/qoriq: select IRQ_DOMAIN ...
904 lines
22 KiB
C
904 lines
22 KiB
C
/*
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* PCA953x 4/8/16/24/40 bit I/O ports
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*
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* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
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* Copyright (C) 2007 Marvell International Ltd.
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*
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* Derived from drivers/i2c/chips/pca9539.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/platform_data/pca953x.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include <linux/of_platform.h>
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#include <linux/acpi.h>
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#define PCA953X_INPUT 0
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#define PCA953X_OUTPUT 1
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#define PCA953X_INVERT 2
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#define PCA953X_DIRECTION 3
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#define REG_ADDR_AI 0x80
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#define PCA957X_IN 0
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#define PCA957X_INVRT 1
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#define PCA957X_BKEN 2
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#define PCA957X_PUPD 3
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#define PCA957X_CFG 4
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#define PCA957X_OUT 5
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#define PCA957X_MSK 6
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#define PCA957X_INTS 7
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#define PCAL953X_IN_LATCH 34
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#define PCAL953X_INT_MASK 37
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#define PCAL953X_INT_STAT 38
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#define PCA_GPIO_MASK 0x00FF
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#define PCA_INT 0x0100
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#define PCA_PCAL 0x0200
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#define PCA953X_TYPE 0x1000
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#define PCA957X_TYPE 0x2000
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#define PCA_TYPE_MASK 0xF000
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#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)
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static const struct i2c_device_id pca953x_id[] = {
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{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
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{ "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9536", 4 | PCA953X_TYPE, },
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{ "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
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{ "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9556", 8 | PCA953X_TYPE, },
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{ "pca9557", 8 | PCA953X_TYPE, },
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{ "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
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{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
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{ "pca9698", 40 | PCA953X_TYPE, },
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{ "max7310", 8 | PCA953X_TYPE, },
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{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7315", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
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{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
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{ "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
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{ "xra1202", 8 | PCA953X_TYPE },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca953x_id);
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static const struct acpi_device_id pca953x_acpi_ids[] = {
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{ "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
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#define MAX_BANK 5
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#define BANK_SZ 8
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#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
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struct pca953x_chip {
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unsigned gpio_start;
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u8 reg_output[MAX_BANK];
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u8 reg_direction[MAX_BANK];
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struct mutex i2c_lock;
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#ifdef CONFIG_GPIO_PCA953X_IRQ
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struct mutex irq_lock;
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u8 irq_mask[MAX_BANK];
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u8 irq_stat[MAX_BANK];
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u8 irq_trig_raise[MAX_BANK];
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u8 irq_trig_fall[MAX_BANK];
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#endif
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struct i2c_client *client;
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struct gpio_chip gpio_chip;
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const char *const *names;
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int chip_type;
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unsigned long driver_data;
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};
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static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
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int off)
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{
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int ret;
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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int offset = off / BANK_SZ;
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ret = i2c_smbus_read_byte_data(chip->client,
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(reg << bank_shift) + offset);
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*val = ret;
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed reading register\n");
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return ret;
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}
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return 0;
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}
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static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
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int off)
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{
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int ret = 0;
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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int offset = off / BANK_SZ;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << bank_shift) + offset, val);
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed writing register\n");
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return ret;
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}
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return 0;
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}
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static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
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{
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int ret = 0;
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if (chip->gpio_chip.ngpio <= 8)
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ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
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else if (chip->gpio_chip.ngpio >= 24) {
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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ret = i2c_smbus_write_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), val);
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} else {
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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ret = i2c_smbus_write_word_data(chip->client,
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reg << 1, cpu_to_le16(get_unaligned((u16 *)val)));
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break;
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case PCA957X_TYPE:
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ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
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val[0]);
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if (ret < 0)
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break;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << 1) + 1,
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val[1]);
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break;
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}
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}
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed writing register\n");
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return ret;
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}
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return 0;
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}
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static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
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{
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int ret;
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if (chip->gpio_chip.ngpio <= 8) {
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ret = i2c_smbus_read_byte_data(chip->client, reg);
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*val = ret;
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} else if (chip->gpio_chip.ngpio >= 24) {
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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ret = i2c_smbus_read_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), val);
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} else {
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ret = i2c_smbus_read_word_data(chip->client, reg << 1);
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val[0] = (u16)ret & 0xFF;
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val[1] = (u16)ret >> 8;
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}
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed reading register\n");
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return ret;
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}
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return 0;
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}
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static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip = gpiochip_get_data(gc);
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u8 reg_val;
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int ret, offset = 0;
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mutex_lock(&chip->i2c_lock);
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reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_direction[off / BANK_SZ] = reg_val;
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ret = 0;
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exit:
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mutex_unlock(&chip->i2c_lock);
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return ret;
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}
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static int pca953x_gpio_direction_output(struct gpio_chip *gc,
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unsigned off, int val)
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{
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struct pca953x_chip *chip = gpiochip_get_data(gc);
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u8 reg_val;
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int ret, offset = 0;
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mutex_lock(&chip->i2c_lock);
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/* set output level */
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if (val)
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reg_val = chip->reg_output[off / BANK_SZ]
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| (1u << (off % BANK_SZ));
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else
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reg_val = chip->reg_output[off / BANK_SZ]
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& ~(1u << (off % BANK_SZ));
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_output[off / BANK_SZ] = reg_val;
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/* then direction */
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reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_direction[off / BANK_SZ] = reg_val;
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ret = 0;
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exit:
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mutex_unlock(&chip->i2c_lock);
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return ret;
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}
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static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip = gpiochip_get_data(gc);
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u32 reg_val;
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int ret, offset = 0;
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mutex_lock(&chip->i2c_lock);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_single(chip, offset, ®_val, off);
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mutex_unlock(&chip->i2c_lock);
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if (ret < 0) {
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/* NOTE: diagnostic already emitted; that's all we should
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* do unless gpio_*_value_cansleep() calls become different
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* from their nonsleeping siblings (and report faults).
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*/
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return 0;
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}
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return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
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}
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static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
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{
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struct pca953x_chip *chip = gpiochip_get_data(gc);
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u8 reg_val;
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int ret, offset = 0;
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mutex_lock(&chip->i2c_lock);
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if (val)
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reg_val = chip->reg_output[off / BANK_SZ]
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| (1u << (off % BANK_SZ));
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else
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reg_val = chip->reg_output[off / BANK_SZ]
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& ~(1u << (off % BANK_SZ));
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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|
|
chip->reg_output[off / BANK_SZ] = reg_val;
|
|
exit:
|
|
mutex_unlock(&chip->i2c_lock);
|
|
}
|
|
|
|
|
|
static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
|
|
unsigned long *mask, unsigned long *bits)
|
|
{
|
|
struct pca953x_chip *chip = gpiochip_get_data(gc);
|
|
u8 reg_val[MAX_BANK];
|
|
int ret, offset = 0;
|
|
int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
|
|
int bank;
|
|
|
|
switch (chip->chip_type) {
|
|
case PCA953X_TYPE:
|
|
offset = PCA953X_OUTPUT;
|
|
break;
|
|
case PCA957X_TYPE:
|
|
offset = PCA957X_OUT;
|
|
break;
|
|
}
|
|
|
|
memcpy(reg_val, chip->reg_output, NBANK(chip));
|
|
mutex_lock(&chip->i2c_lock);
|
|
for(bank=0; bank<NBANK(chip); bank++) {
|
|
unsigned bankmask = mask[bank / sizeof(*mask)] >>
|
|
((bank % sizeof(*mask)) * 8);
|
|
if(bankmask) {
|
|
unsigned bankval = bits[bank / sizeof(*bits)] >>
|
|
((bank % sizeof(*bits)) * 8);
|
|
reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval;
|
|
}
|
|
}
|
|
ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
memcpy(chip->reg_output, reg_val, NBANK(chip));
|
|
exit:
|
|
mutex_unlock(&chip->i2c_lock);
|
|
}
|
|
|
|
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->set_multiple = pca953x_gpio_set_multiple;
|
|
gc->can_sleep = true;
|
|
|
|
gc->base = chip->gpio_start;
|
|
gc->ngpio = gpios;
|
|
gc->label = chip->client->name;
|
|
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 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];
|
|
|
|
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 &= ~chip->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 struct irq_chip pca953x_irq_chip = {
|
|
.name = "pca953x",
|
|
.irq_mask = pca953x_irq_mask,
|
|
.irq_unmask = pca953x_irq_unmask,
|
|
.irq_bus_lock = pca953x_irq_bus_lock,
|
|
.irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
|
|
.irq_set_type = pca953x_irq_set_type,
|
|
};
|
|
|
|
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 ret, i, offset = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
switch (chip->chip_type) {
|
|
case PCA953X_TYPE:
|
|
offset = PCA953X_INPUT;
|
|
break;
|
|
case PCA957X_TYPE:
|
|
offset = PCA957X_IN;
|
|
break;
|
|
}
|
|
ret = pca953x_read_regs(chip, offset, cur_stat);
|
|
if (ret)
|
|
return false;
|
|
|
|
/* Remove output pins from the equation */
|
|
for (i = 0; i < NBANK(chip); i++)
|
|
cur_stat[i] &= chip->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.irqdomain,
|
|
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;
|
|
int ret, i, offset = 0;
|
|
|
|
if (client->irq && irq_base != -1
|
|
&& (chip->driver_data & PCA_INT)) {
|
|
|
|
switch (chip->chip_type) {
|
|
case PCA953X_TYPE:
|
|
offset = PCA953X_INPUT;
|
|
break;
|
|
case PCA957X_TYPE:
|
|
offset = PCA957X_IN;
|
|
break;
|
|
}
|
|
ret = pca953x_read_regs(chip, offset, 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.
|
|
*/
|
|
for (i = 0; i < NBANK(chip); i++)
|
|
chip->irq_stat[i] &= chip->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;
|
|
}
|
|
|
|
ret = gpiochip_irqchip_add(&chip->gpio_chip,
|
|
&pca953x_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_chained_irqchip(&chip->gpio_chip,
|
|
&pca953x_irq_chip,
|
|
client->irq, NULL);
|
|
}
|
|
|
|
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 (irq_base != -1 && (chip->driver_data & PCA_INT))
|
|
dev_warn(&client->dev, "interrupt support not compiled in\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
|
|
{
|
|
int ret;
|
|
u8 val[MAX_BANK];
|
|
|
|
ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
|
|
chip->reg_direction);
|
|
if (ret)
|
|
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, PCA953X_INVERT, val);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
|
|
{
|
|
int ret;
|
|
u8 val[MAX_BANK];
|
|
|
|
ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
|
|
if (ret)
|
|
goto out;
|
|
ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
|
|
if (ret)
|
|
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, PCA957X_INVRT, val);
|
|
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 *id)
|
|
{
|
|
struct pca953x_platform_data *pdata;
|
|
struct pca953x_chip *chip;
|
|
int irq_base = 0;
|
|
int ret;
|
|
u32 invert = 0;
|
|
|
|
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 {
|
|
chip->gpio_start = -1;
|
|
irq_base = 0;
|
|
}
|
|
|
|
chip->client = client;
|
|
|
|
if (id) {
|
|
chip->driver_data = id->driver_data;
|
|
} else {
|
|
const struct acpi_device_id *id;
|
|
const struct of_device_id *match;
|
|
|
|
match = of_match_device(pca953x_dt_ids, &client->dev);
|
|
if (match) {
|
|
chip->driver_data = (int)(uintptr_t)match->data;
|
|
} else {
|
|
id = acpi_match_device(pca953x_acpi_ids, &client->dev);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
chip->driver_data = id->driver_data;
|
|
}
|
|
}
|
|
|
|
chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);
|
|
|
|
mutex_init(&chip->i2c_lock);
|
|
|
|
/* 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 (chip->chip_type == PCA953X_TYPE)
|
|
ret = device_pca953x_init(chip, invert);
|
|
else
|
|
ret = device_pca957x_init(chip, invert);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = pca953x_irq_setup(chip, irq_base);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
return 0;
|
|
}
|
|
|
|
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 = 0;
|
|
|
|
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);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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,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), },
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|
{ .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
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|
{ .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 = "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 = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
|
|
{ .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 = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
|
|
|
|
{ .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
|
|
|
|
static struct i2c_driver pca953x_driver = {
|
|
.driver = {
|
|
.name = "pca953x",
|
|
.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");
|