1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Delta TN48M CPLD GPIO driver 4 * 5 * Copyright (C) 2021 Sartura Ltd. 6 * 7 * Author: Robert Marko <robert.marko@sartura.hr> 8 */ 9 10 #include <linux/device.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/gpio/regmap.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 18 enum tn48m_gpio_type { 19 TN48M_GP0 = 1, 20 TN48M_GPI, 21 }; 22 23 struct tn48m_gpio_config { 24 int ngpio; 25 int ngpio_per_reg; 26 enum tn48m_gpio_type type; 27 }; 28 29 static const struct tn48m_gpio_config tn48m_gpo_config = { 30 .ngpio = 4, 31 .ngpio_per_reg = 4, 32 .type = TN48M_GP0, 33 }; 34 35 static const struct tn48m_gpio_config tn48m_gpi_config = { 36 .ngpio = 4, 37 .ngpio_per_reg = 4, 38 .type = TN48M_GPI, 39 }; 40 41 static int tn48m_gpio_probe(struct platform_device *pdev) 42 { 43 const struct tn48m_gpio_config *gpio_config; 44 struct gpio_regmap_config config = {}; 45 struct regmap *regmap; 46 u32 base; 47 int ret; 48 49 if (!pdev->dev.parent) 50 return -ENODEV; 51 52 gpio_config = device_get_match_data(&pdev->dev); 53 if (!gpio_config) 54 return -ENODEV; 55 56 ret = device_property_read_u32(&pdev->dev, "reg", &base); 57 if (ret) 58 return ret; 59 60 regmap = dev_get_regmap(pdev->dev.parent, NULL); 61 if (!regmap) 62 return -ENODEV; 63 64 config.regmap = regmap; 65 config.parent = &pdev->dev; 66 config.ngpio = gpio_config->ngpio; 67 config.ngpio_per_reg = gpio_config->ngpio_per_reg; 68 switch (gpio_config->type) { 69 case TN48M_GP0: 70 config.reg_set_base = base; 71 break; 72 case TN48M_GPI: 73 config.reg_dat_base = base; 74 break; 75 default: 76 return -EINVAL; 77 } 78 79 return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config)); 80 } 81 82 static const struct of_device_id tn48m_gpio_of_match[] = { 83 { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config }, 84 { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config }, 85 { } 86 }; 87 MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match); 88 89 static struct platform_driver tn48m_gpio_driver = { 90 .driver = { 91 .name = "delta-tn48m-gpio", 92 .of_match_table = tn48m_gpio_of_match, 93 }, 94 .probe = tn48m_gpio_probe, 95 }; 96 module_platform_driver(tn48m_gpio_driver); 97 98 MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>"); 99 MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver"); 100 MODULE_LICENSE("GPL"); 101