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drivers/gpio/gpio-tps65218.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Copyright 2015 Verifone Int. * * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com> * |
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* This driver is based on the gpio-tps65912 implementation. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/gpio/driver.h> #include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/tps65218.h> |
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struct tps65218_gpio { struct tps65218 *tps65218; struct gpio_chip gpio_chip; }; static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset) { struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); struct tps65218 *tps65218 = tps65218_gpio->tps65218; unsigned int val; int ret; |
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ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val); |
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if (ret) return ret; return !!(val & (TPS65218_ENABLE2_GPIO1 << offset)); } static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset, int value) { struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); struct tps65218 *tps65218 = tps65218_gpio->tps65218; if (value) tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2, TPS65218_ENABLE2_GPIO1 << offset, TPS65218_ENABLE2_GPIO1 << offset, TPS65218_PROTECT_L1); else tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2, TPS65218_ENABLE2_GPIO1 << offset, TPS65218_PROTECT_L1); } static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset, int value) { /* Only drives GPOs */ |
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tps65218_gpio_set(gc, offset, value); |
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return 0; } static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset) { return -EPERM; } static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset) { struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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int ret; |
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if (gpiochip_line_is_open_source(gc, offset)) { |
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dev_err(gc->parent, "can't work as open source "); return -EINVAL; } switch (offset) { case 0: |
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if (!gpiochip_line_is_open_drain(gc, offset)) { |
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dev_err(gc->parent, "GPO1 works only as open drain "); return -EINVAL; } /* Disable sequencer for GPO1 */ ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, TPS65218_SEQ7_GPO1_SEQ_MASK, TPS65218_PROTECT_L1); if (ret) return ret; /* Setup GPO1 */ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, TPS65218_CONFIG1_IO1_SEL, TPS65218_PROTECT_L1); if (ret) return ret; break; case 1: |
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/* Setup GPO2 */ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, TPS65218_CONFIG1_IO1_SEL, TPS65218_PROTECT_L1); if (ret) return ret; break; case 2: |
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if (!gpiochip_line_is_open_drain(gc, offset)) { |
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dev_err(gc->parent, "GPO3 works only as open drain "); return -EINVAL; } /* Disable sequencer for GPO3 */ ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, TPS65218_SEQ7_GPO3_SEQ_MASK, TPS65218_PROTECT_L1); if (ret) return ret; /* Setup GPO3 */ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2, TPS65218_CONFIG2_DC12_RST, TPS65218_PROTECT_L1); if (ret) return ret; break; default: return -EINVAL; } return 0; } |
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static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset, unsigned long config) |
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{ struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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enum pin_config_param param = pinconf_to_config_param(config); |
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switch (offset) { case 0: case 2: /* GPO1 is hardwired to be open drain */ |
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if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) |
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return 0; return -ENOTSUPP; case 1: /* GPO2 is push-pull by default, can be set as open drain. */ |
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if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) |
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return tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, TPS65218_CONFIG1_GPO2_BUF, TPS65218_PROTECT_L1); |
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if (param == PIN_CONFIG_DRIVE_PUSH_PULL) |
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return tps65218_set_bits(tps65218, TPS65218_REG_CONFIG1, TPS65218_CONFIG1_GPO2_BUF, TPS65218_CONFIG1_GPO2_BUF, TPS65218_PROTECT_L1); return -ENOTSUPP; default: break; } return -ENOTSUPP; } |
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static const struct gpio_chip template_chip = { |
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.label = "gpio-tps65218", .owner = THIS_MODULE, .request = tps65218_gpio_request, .direction_output = tps65218_gpio_output, .direction_input = tps65218_gpio_input, .get = tps65218_gpio_get, .set = tps65218_gpio_set, |
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.set_config = tps65218_gpio_set_config, |
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.can_sleep = true, .ngpio = 3, .base = -1, }; static int tps65218_gpio_probe(struct platform_device *pdev) { struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent); struct tps65218_gpio *tps65218_gpio; int ret; tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio), GFP_KERNEL); if (!tps65218_gpio) return -ENOMEM; tps65218_gpio->tps65218 = tps65218; tps65218_gpio->gpio_chip = template_chip; tps65218_gpio->gpio_chip.parent = &pdev->dev; #ifdef CONFIG_OF_GPIO tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node; #endif |
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ret = devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip, tps65218_gpio); |
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if (ret < 0) { dev_err(&pdev->dev, "Failed to register gpiochip, %d ", ret); return ret; } platform_set_drvdata(pdev, tps65218_gpio); return ret; } |
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static const struct of_device_id tps65218_dt_match[] = { { .compatible = "ti,tps65218-gpio" }, { } }; MODULE_DEVICE_TABLE(of, tps65218_dt_match); |
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static const struct platform_device_id tps65218_gpio_id_table[] = { { "tps65218-gpio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table); |
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static struct platform_driver tps65218_gpio_driver = { .driver = { .name = "tps65218-gpio", .of_match_table = of_match_ptr(tps65218_dt_match) }, .probe = tps65218_gpio_probe, |
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.id_table = tps65218_gpio_id_table, |
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}; module_platform_driver(tps65218_gpio_driver); MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>"); MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:tps65218-gpio"); |