mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Core changes: - The big core change is the updated (v2) userspace character device API. This corrects badly designed 64-bit alignment around the line events. We also add the debounce request feature. This echoes the often quotes passage from Frederick Brooks "The mythical man-month" to always throw one away, which we have seen before in things such as V4L2. So we put in a new one and deprecate and obsolete the old one. - All example tools in tools/gpio/* are migrated to the new API to set a good example. The libgpiod userspace library has been augmented to use this new API pretty much from day 1. - Some misc API hardening by using strn* function calls has been added as well. - Use the simpler IDA interface for GPIO chip instance enumeration. - Add device core function for counting string arrays in device properties. - Provide a generic library function kfree_strarray() that can be used throughout the kernel. Driver enhancements: - The DesignWare dwapb-gpio driver has been enhanced and now uses the IRQ handling in the gpiolib core. - The mockup and aggregator drivers have seen some substantial code clean-up and now use more of the core kernel inftrastructure. - Misc cleanups using dev_err_probe(). - The MXC drivers (Freescale/NXP) can now be built modularized, which makes modularized GKI Android kernels happy. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEElDRnuGcz/wPCXQWMQRCzN7AZXXMFAl+FdjkACgkQQRCzN7AZ XXMYgQ/+JgpHrp7yS1IkS1KiAxHdeIGnKzloTCQQo1JxYEymAnIeMwo/iWAk5wHu NeJIEVxD0YzZwoI3BXbnO5Qy/62g1z7Ik8ToIa0TiFMwYxz5a7lqsiHwpBgHa50h T2N8FRFdslVrhpUYBH4Q9wlfYxTki4FwdTD6aaoFFGcMwIVJXWyaYzE+o+qEUEne VaPsGoNhRKTdKASP3c6+zbbPonzpZW7s/wvIBQAyBgPxEizlL97RzzX3bSSraoCX i0NsDLHMe+9twqE064KN+CYu0Cy80etQSQsYcfnstVshMuY9+WC1YdyJqzYMciuQ CYUIQBeskft86IBlsEU/fNCbV+FeAgrxRW6TJK7Hn+sUWZ5+UGdpJ03UE1hA3jjO SniwG0vpqvZIkio49B6h51VdjNqVJn+AE8tN3hCzqpFknblXgJOVysD7RS7rNM6D flV1bCsUYtC6jN43qsGFiRYLE9ml2iUxFFoBQUaAEh+pXgUzPTQqD7aSjyzmE3x2 uapKXgxN0dCNH+tFXij73Ro4bYf4ZTZhx3Z3XoEUNEyJpl8fE1bv1SZ2EykOmK8g c78fAmT0vG3xYZvK10WZj4zuHV6GlPAYVm/MlhB7QHsrF3wa9vervOuqhEPmp2th hTsVj/Zlz0SSDLncMQL64B7gbxOmzOYlVRxIkSrDEXUOFU7kiWE= =8CE2 -----END PGP SIGNATURE----- Merge tag 'gpio-v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This time very little driver changes but lots of core changes. We have some interesting cooperative work for ARM and Intel alike, making the GPIO subsystem more and more suitable for industrial systems and the like, in addition to the in-kernel users. We touch driver core (device properties) and lib/* by adding one simple string array free function, these are authored by Andy Shevchenko who is a well known and recognized core helpers maintainers so this should be fine. We also see some Android GKI-related modularization in the MXC drivers. Core changes: - The big core change is the updated (v2) userspace character device API. This corrects badly designed 64-bit alignment around the line events. We also add the debounce request feature. This echoes the often quotes passage from Frederick Brooks "The mythical man-month" to always throw one away, which we have seen before in things such as V4L2. So we put in a new one and deprecate and obsolete the old one. - All example tools in tools/gpio/* are migrated to the new API to set a good example. The libgpiod userspace library has been augmented to use this new API pretty much from day 1. - Some misc API hardening by using strn* function calls has been added as well. - Use the simpler IDA interface for GPIO chip instance enumeration. - Add device core function for counting string arrays in device properties. - Provide a generic library function kfree_strarray() that can be used throughout the kernel. Driver enhancements: - The DesignWare dwapb-gpio driver has been enhanced and now uses the IRQ handling in the gpiolib core. - The mockup and aggregator drivers have seen some substantial code clean-up and now use more of the core kernel inftrastructure. - Misc cleanups using dev_err_probe(). - The MXC drivers (Freescale/NXP) can now be built modularized, which makes modularized GKI Android kernels happy" * tag 'gpio-v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (73 commits) gpiolib: Update header block in gpiolib-cdev.h gpiolib: cdev: switch from kstrdup() to kstrndup() docs: gpio: add a new document to its index.rst gpio: pca953x: Add support for the NXP PCAL9554B/C tools: gpio: add debounce support to gpio-event-mon tools: gpio: add multi-line monitoring to gpio-event-mon tools: gpio: port gpio-event-mon to v2 uAPI tools: gpio: port gpio-hammer to v2 uAPI tools: gpio: rename nlines to num_lines tools: gpio: port gpio-watch to v2 uAPI tools: gpio: port lsgpio to v2 uAPI gpio: uapi: document uAPI v1 as deprecated gpiolib: cdev: support setting debounce gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL gpiolib: cdev: support edge detection for uAPI v2 gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL gpiolib: add build option for CDEV v1 ABI gpiolib: make cdev a build option ...
381 lines
10 KiB
C
381 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/gpio/driver.h>
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#include <linux/of.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/tc3589x.h>
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#include <linux/bitops.h>
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/*
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* These registers are modified under the irq bus lock and cached to avoid
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* unnecessary writes in bus_sync_unlock.
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*/
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enum { REG_IBE, REG_IEV, REG_IS, REG_IE, REG_DIRECT };
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#define CACHE_NR_REGS 5
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#define CACHE_NR_BANKS 3
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struct tc3589x_gpio {
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struct gpio_chip chip;
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struct tc3589x *tc3589x;
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struct device *dev;
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struct mutex irq_lock;
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/* Caches of interrupt control registers for bus_lock */
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u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
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u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
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};
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static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
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u8 mask = BIT(offset % 8);
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int ret;
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ret = tc3589x_reg_read(tc3589x, reg);
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if (ret < 0)
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return ret;
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return !!(ret & mask);
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}
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static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
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unsigned int pos = offset % 8;
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u8 data[] = {val ? BIT(pos) : 0, BIT(pos)};
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tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
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}
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static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int val)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODIR0 + offset / 8;
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unsigned int pos = offset % 8;
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tc3589x_gpio_set(chip, offset, val);
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return tc3589x_set_bits(tc3589x, reg, BIT(pos), BIT(pos));
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}
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static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODIR0 + offset / 8;
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unsigned int pos = offset % 8;
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return tc3589x_set_bits(tc3589x, reg, BIT(pos), 0);
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}
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static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODIR0 + offset / 8;
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unsigned int pos = offset % 8;
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int ret;
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ret = tc3589x_reg_read(tc3589x, reg);
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if (ret < 0)
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return ret;
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if (ret & BIT(pos))
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int tc3589x_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
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unsigned long config)
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{
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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/*
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* These registers are alterated at each second address
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* ODM bit 0 = drive to GND or Hi-Z (open drain)
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* ODM bit 1 = drive to VDD or Hi-Z (open source)
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*/
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u8 odmreg = TC3589x_GPIOODM0 + (offset / 8) * 2;
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u8 odereg = TC3589x_GPIOODE0 + (offset / 8) * 2;
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unsigned int pos = offset % 8;
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int ret;
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switch (pinconf_to_config_param(config)) {
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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/* Set open drain mode */
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ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), 0);
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if (ret)
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return ret;
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/* Enable open drain/source mode */
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return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
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case PIN_CONFIG_DRIVE_OPEN_SOURCE:
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/* Set open source mode */
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ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), BIT(pos));
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if (ret)
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return ret;
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/* Enable open drain/source mode */
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return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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/* Disable open drain/source mode */
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return tc3589x_set_bits(tc3589x, odereg, BIT(pos), 0);
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default:
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break;
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}
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return -ENOTSUPP;
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}
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static const struct gpio_chip template_chip = {
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.label = "tc3589x",
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.owner = THIS_MODULE,
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.get = tc3589x_gpio_get,
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.set = tc3589x_gpio_set,
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.direction_output = tc3589x_gpio_direction_output,
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.direction_input = tc3589x_gpio_direction_input,
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.get_direction = tc3589x_gpio_get_direction,
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.set_config = tc3589x_gpio_set_config,
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.can_sleep = true,
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};
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static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = BIT(offset % 8);
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if (type == IRQ_TYPE_EDGE_BOTH) {
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tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
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return 0;
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}
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tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
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if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
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tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
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else
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tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
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if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
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tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
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else
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tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
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return 0;
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}
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static void tc3589x_gpio_irq_lock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
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mutex_lock(&tc3589x_gpio->irq_lock);
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}
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static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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static const u8 regmap[] = {
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[REG_IBE] = TC3589x_GPIOIBE0,
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[REG_IEV] = TC3589x_GPIOIEV0,
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[REG_IS] = TC3589x_GPIOIS0,
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[REG_IE] = TC3589x_GPIOIE0,
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[REG_DIRECT] = TC3589x_DIRECT0,
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};
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int i, j;
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for (i = 0; i < CACHE_NR_REGS; i++) {
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for (j = 0; j < CACHE_NR_BANKS; j++) {
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u8 old = tc3589x_gpio->oldregs[i][j];
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u8 new = tc3589x_gpio->regs[i][j];
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if (new == old)
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continue;
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tc3589x_gpio->oldregs[i][j] = new;
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tc3589x_reg_write(tc3589x, regmap[i] + j, new);
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}
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}
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mutex_unlock(&tc3589x_gpio->irq_lock);
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}
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static void tc3589x_gpio_irq_mask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = BIT(offset % 8);
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tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
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tc3589x_gpio->regs[REG_DIRECT][regoffset] |= mask;
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}
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static void tc3589x_gpio_irq_unmask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = BIT(offset % 8);
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tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
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tc3589x_gpio->regs[REG_DIRECT][regoffset] &= ~mask;
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}
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static struct irq_chip tc3589x_gpio_irq_chip = {
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.name = "tc3589x-gpio",
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.irq_bus_lock = tc3589x_gpio_irq_lock,
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.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
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.irq_mask = tc3589x_gpio_irq_mask,
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.irq_unmask = tc3589x_gpio_irq_unmask,
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.irq_set_type = tc3589x_gpio_irq_set_type,
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};
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static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
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{
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struct tc3589x_gpio *tc3589x_gpio = dev;
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 status[CACHE_NR_BANKS];
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int ret;
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int i;
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ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
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ARRAY_SIZE(status), status);
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if (ret < 0)
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return IRQ_NONE;
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for (i = 0; i < ARRAY_SIZE(status); i++) {
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unsigned int stat = status[i];
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if (!stat)
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continue;
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while (stat) {
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int bit = __ffs(stat);
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int line = i * 8 + bit;
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int irq = irq_find_mapping(tc3589x_gpio->chip.irq.domain,
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line);
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handle_nested_irq(irq);
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stat &= ~(1 << bit);
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}
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tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
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}
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return IRQ_HANDLED;
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}
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static int tc3589x_gpio_probe(struct platform_device *pdev)
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{
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struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
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struct device_node *np = pdev->dev.of_node;
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struct tc3589x_gpio *tc3589x_gpio;
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struct gpio_irq_chip *girq;
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int ret;
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int irq;
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if (!np) {
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dev_err(&pdev->dev, "No Device Tree node found\n");
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return -EINVAL;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
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GFP_KERNEL);
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if (!tc3589x_gpio)
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return -ENOMEM;
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mutex_init(&tc3589x_gpio->irq_lock);
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tc3589x_gpio->dev = &pdev->dev;
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tc3589x_gpio->tc3589x = tc3589x;
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tc3589x_gpio->chip = template_chip;
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tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
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tc3589x_gpio->chip.parent = &pdev->dev;
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tc3589x_gpio->chip.base = -1;
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tc3589x_gpio->chip.of_node = np;
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girq = &tc3589x_gpio->chip.irq;
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girq->chip = &tc3589x_gpio_irq_chip;
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/* This will let us handle the parent IRQ in the driver */
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girq->parent_handler = NULL;
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girq->num_parents = 0;
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girq->parents = NULL;
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girq->default_type = IRQ_TYPE_NONE;
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girq->handler = handle_simple_irq;
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girq->threaded = true;
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/* Bring the GPIO module out of reset */
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ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
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TC3589x_RSTCTRL_GPIRST, 0);
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if (ret < 0)
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return ret;
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/* For tc35894, have to disable Direct KBD interrupts,
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* else IRQST will always be 0x20, IRQN low level, can't
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* clear the irq status.
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* TODO: need more test on other tc3589x chip.
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*
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*/
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ret = tc3589x_reg_write(tc3589x, TC3589x_DKBDMSK,
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TC3589x_DKBDMSK_ELINT | TC3589x_DKBDMSK_EINT);
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if (ret < 0)
|
|
return ret;
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev,
|
|
irq, NULL, tc3589x_gpio_irq,
|
|
IRQF_ONESHOT, "tc3589x-gpio",
|
|
tc3589x_gpio);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_gpiochip_add_data(&pdev->dev, &tc3589x_gpio->chip,
|
|
tc3589x_gpio);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, tc3589x_gpio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver tc3589x_gpio_driver = {
|
|
.driver.name = "tc3589x-gpio",
|
|
.probe = tc3589x_gpio_probe,
|
|
};
|
|
|
|
static int __init tc3589x_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&tc3589x_gpio_driver);
|
|
}
|
|
subsys_initcall(tc3589x_gpio_init);
|