1 // SPDX-License-Identifier: GPL-2.0-only
3 * GPIO support for Cirrus Logic Madera codecs
5 * Copyright (C) 2015-2018 Cirrus Logic
8 #include <linux/gpio/driver.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
13 #include <linux/mfd/madera/core.h>
14 #include <linux/mfd/madera/pdata.h>
15 #include <linux/mfd/madera/registers.h>
18 struct madera *madera;
19 /* storage space for the gpio_chip we're using */
20 struct gpio_chip gpio_chip;
23 static int madera_gpio_get_direction(struct gpio_chip *chip,
26 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
27 struct madera *madera = madera_gpio->madera;
28 unsigned int reg_offset = 2 * offset;
32 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
37 return !!(val & MADERA_GP1_DIR_MASK);
40 static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
42 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
43 struct madera *madera = madera_gpio->madera;
44 unsigned int reg_offset = 2 * offset;
46 return regmap_update_bits(madera->regmap,
47 MADERA_GPIO1_CTRL_2 + reg_offset,
48 MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
51 static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
53 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
54 struct madera *madera = madera_gpio->madera;
55 unsigned int reg_offset = 2 * offset;
59 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
64 return !!(val & MADERA_GP1_LVL_MASK);
67 static int madera_gpio_direction_out(struct gpio_chip *chip,
68 unsigned int offset, int value)
70 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
71 struct madera *madera = madera_gpio->madera;
72 unsigned int reg_offset = 2 * offset;
73 unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
76 ret = regmap_update_bits(madera->regmap,
77 MADERA_GPIO1_CTRL_2 + reg_offset,
78 MADERA_GP1_DIR_MASK, 0);
82 return regmap_update_bits(madera->regmap,
83 MADERA_GPIO1_CTRL_1 + reg_offset,
84 MADERA_GP1_LVL_MASK, reg_val);
87 static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
90 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
91 struct madera *madera = madera_gpio->madera;
92 unsigned int reg_offset = 2 * offset;
93 unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
96 ret = regmap_update_bits(madera->regmap,
97 MADERA_GPIO1_CTRL_1 + reg_offset,
98 MADERA_GP1_LVL_MASK, reg_val);
100 /* set() doesn't return an error so log a warning */
102 dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
103 MADERA_GPIO1_CTRL_1 + reg_offset, ret);
106 static const struct gpio_chip madera_gpio_chip = {
108 .owner = THIS_MODULE,
109 .request = gpiochip_generic_request,
110 .free = gpiochip_generic_free,
111 .get_direction = madera_gpio_get_direction,
112 .direction_input = madera_gpio_direction_in,
113 .get = madera_gpio_get,
114 .direction_output = madera_gpio_direction_out,
115 .set = madera_gpio_set,
116 .set_config = gpiochip_generic_config,
120 static int madera_gpio_probe(struct platform_device *pdev)
122 struct madera *madera = dev_get_drvdata(pdev->dev.parent);
123 struct madera_pdata *pdata = &madera->pdata;
124 struct madera_gpio *madera_gpio;
127 madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
132 madera_gpio->madera = madera;
134 /* Construct suitable gpio_chip from the template in madera_gpio_chip */
135 madera_gpio->gpio_chip = madera_gpio_chip;
136 madera_gpio->gpio_chip.parent = pdev->dev.parent;
138 switch (madera->type) {
140 madera_gpio->gpio_chip.ngpio = CS47L15_NUM_GPIOS;
143 madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
147 madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
151 madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
156 madera_gpio->gpio_chip.ngpio = CS47L92_NUM_GPIOS;
159 dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
163 /* We want to be usable on systems that don't use devicetree or acpi */
164 if (pdata->gpio_base)
165 madera_gpio->gpio_chip.base = pdata->gpio_base;
167 madera_gpio->gpio_chip.base = -1;
169 ret = devm_gpiochip_add_data(&pdev->dev,
170 &madera_gpio->gpio_chip,
173 dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
178 * This is part of a composite MFD device which can only be used with
179 * the corresponding pinctrl driver. On all supported silicon the GPIO
180 * to pinctrl mapping is fixed in the silicon, so we register it
181 * explicitly instead of requiring a redundant gpio-ranges in the
183 * In any case we also want to work on systems that don't use devicetree
186 ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
187 0, 0, madera_gpio->gpio_chip.ngpio);
189 dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret);
196 static struct platform_driver madera_gpio_driver = {
198 .name = "madera-gpio",
200 .probe = madera_gpio_probe,
203 module_platform_driver(madera_gpio_driver);
205 MODULE_SOFTDEP("pre: pinctrl-madera");
206 MODULE_DESCRIPTION("GPIO interface for Madera codecs");
207 MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
208 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
209 MODULE_LICENSE("GPL v2");
210 MODULE_ALIAS("platform:madera-gpio");