1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * GPIO support for Cirrus Logic Madera codecs 4 * 5 * Copyright (C) 2015-2018 Cirrus Logic 6 */ 7 8 #include <linux/gpio/driver.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 13 #include <linux/mfd/madera/core.h> 14 #include <linux/mfd/madera/pdata.h> 15 #include <linux/mfd/madera/registers.h> 16 17 struct madera_gpio { 18 struct madera *madera; 19 /* storage space for the gpio_chip we're using */ 20 struct gpio_chip gpio_chip; 21 }; 22 23 static int madera_gpio_get_direction(struct gpio_chip *chip, 24 unsigned int offset) 25 { 26 struct madera_gpio *madera_gpio = gpiochip_get_data(chip); 27 struct madera *madera = madera_gpio->madera; 28 unsigned int reg_offset = 2 * offset; 29 unsigned int val; 30 int ret; 31 32 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset, 33 &val); 34 if (ret < 0) 35 return ret; 36 37 if (val & MADERA_GP1_DIR_MASK) 38 return GPIO_LINE_DIRECTION_IN; 39 40 return GPIO_LINE_DIRECTION_OUT; 41 } 42 43 static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset) 44 { 45 struct madera_gpio *madera_gpio = gpiochip_get_data(chip); 46 struct madera *madera = madera_gpio->madera; 47 unsigned int reg_offset = 2 * offset; 48 49 return regmap_update_bits(madera->regmap, 50 MADERA_GPIO1_CTRL_2 + reg_offset, 51 MADERA_GP1_DIR_MASK, MADERA_GP1_DIR); 52 } 53 54 static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset) 55 { 56 struct madera_gpio *madera_gpio = gpiochip_get_data(chip); 57 struct madera *madera = madera_gpio->madera; 58 unsigned int reg_offset = 2 * offset; 59 unsigned int val; 60 int ret; 61 62 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset, 63 &val); 64 if (ret < 0) 65 return ret; 66 67 return !!(val & MADERA_GP1_LVL_MASK); 68 } 69 70 static int madera_gpio_direction_out(struct gpio_chip *chip, 71 unsigned int offset, int value) 72 { 73 struct madera_gpio *madera_gpio = gpiochip_get_data(chip); 74 struct madera *madera = madera_gpio->madera; 75 unsigned int reg_offset = 2 * offset; 76 unsigned int reg_val = value ? MADERA_GP1_LVL : 0; 77 int ret; 78 79 ret = regmap_update_bits(madera->regmap, 80 MADERA_GPIO1_CTRL_2 + reg_offset, 81 MADERA_GP1_DIR_MASK, 0); 82 if (ret < 0) 83 return ret; 84 85 return regmap_update_bits(madera->regmap, 86 MADERA_GPIO1_CTRL_1 + reg_offset, 87 MADERA_GP1_LVL_MASK, reg_val); 88 } 89 90 static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset, 91 int value) 92 { 93 struct madera_gpio *madera_gpio = gpiochip_get_data(chip); 94 struct madera *madera = madera_gpio->madera; 95 unsigned int reg_offset = 2 * offset; 96 unsigned int reg_val = value ? MADERA_GP1_LVL : 0; 97 int ret; 98 99 ret = regmap_update_bits(madera->regmap, 100 MADERA_GPIO1_CTRL_1 + reg_offset, 101 MADERA_GP1_LVL_MASK, reg_val); 102 103 /* set() doesn't return an error so log a warning */ 104 if (ret) 105 dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n", 106 MADERA_GPIO1_CTRL_1 + reg_offset, ret); 107 } 108 109 static const struct gpio_chip madera_gpio_chip = { 110 .label = "madera", 111 .owner = THIS_MODULE, 112 .request = gpiochip_generic_request, 113 .free = gpiochip_generic_free, 114 .get_direction = madera_gpio_get_direction, 115 .direction_input = madera_gpio_direction_in, 116 .get = madera_gpio_get, 117 .direction_output = madera_gpio_direction_out, 118 .set = madera_gpio_set, 119 .set_config = gpiochip_generic_config, 120 .can_sleep = true, 121 }; 122 123 static int madera_gpio_probe(struct platform_device *pdev) 124 { 125 struct madera *madera = dev_get_drvdata(pdev->dev.parent); 126 struct madera_pdata *pdata = &madera->pdata; 127 struct madera_gpio *madera_gpio; 128 int ret; 129 130 madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio), 131 GFP_KERNEL); 132 if (!madera_gpio) 133 return -ENOMEM; 134 135 madera_gpio->madera = madera; 136 137 /* Construct suitable gpio_chip from the template in madera_gpio_chip */ 138 madera_gpio->gpio_chip = madera_gpio_chip; 139 madera_gpio->gpio_chip.parent = pdev->dev.parent; 140 141 switch (madera->type) { 142 case CS47L15: 143 madera_gpio->gpio_chip.ngpio = CS47L15_NUM_GPIOS; 144 break; 145 case CS47L35: 146 madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS; 147 break; 148 case CS47L85: 149 case WM1840: 150 madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS; 151 break; 152 case CS47L90: 153 case CS47L91: 154 madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS; 155 break; 156 case CS42L92: 157 case CS47L92: 158 case CS47L93: 159 madera_gpio->gpio_chip.ngpio = CS47L92_NUM_GPIOS; 160 break; 161 default: 162 dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type); 163 return -EINVAL; 164 } 165 166 /* We want to be usable on systems that don't use devicetree or acpi */ 167 if (pdata->gpio_base) 168 madera_gpio->gpio_chip.base = pdata->gpio_base; 169 else 170 madera_gpio->gpio_chip.base = -1; 171 172 ret = devm_gpiochip_add_data(&pdev->dev, 173 &madera_gpio->gpio_chip, 174 madera_gpio); 175 if (ret < 0) { 176 dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret); 177 return ret; 178 } 179 180 /* 181 * This is part of a composite MFD device which can only be used with 182 * the corresponding pinctrl driver. On all supported silicon the GPIO 183 * to pinctrl mapping is fixed in the silicon, so we register it 184 * explicitly instead of requiring a redundant gpio-ranges in the 185 * devicetree. 186 * In any case we also want to work on systems that don't use devicetree 187 * or acpi. 188 */ 189 ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl", 190 0, 0, madera_gpio->gpio_chip.ngpio); 191 if (ret) { 192 dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret); 193 return ret; 194 } 195 196 return 0; 197 } 198 199 static struct platform_driver madera_gpio_driver = { 200 .driver = { 201 .name = "madera-gpio", 202 }, 203 .probe = madera_gpio_probe, 204 }; 205 206 module_platform_driver(madera_gpio_driver); 207 208 MODULE_SOFTDEP("pre: pinctrl-madera"); 209 MODULE_DESCRIPTION("GPIO interface for Madera codecs"); 210 MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>"); 211 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>"); 212 MODULE_LICENSE("GPL v2"); 213 MODULE_ALIAS("platform:madera-gpio"); 214