1 // SPDX-License-Identifier: GPL-2.0-only
3  * GPIO driver for EXAR XRA1403 16-bit GPIO expander
23 #define XRA_PUR   0x08 /* Input Internal Pull-up Resistor Enable/Disable */
25 #define XRA_TSCR  0x0C /* Output Three-State Control */
33 	struct gpio_chip  chip;  member
50 static int xra1403_direction_input(struct gpio_chip *chip, unsigned int offset)  in xra1403_direction_input()  argument
52 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_direction_input()
54 	return regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),  in xra1403_direction_input()
58 static int xra1403_direction_output(struct gpio_chip *chip, unsigned int offset,  in xra1403_direction_output()  argument
62 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_direction_output()
64 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),  in xra1403_direction_output()
69 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),  in xra1403_direction_output()
75 static int xra1403_get_direction(struct gpio_chip *chip, unsigned int offset)  in xra1403_get_direction()  argument
79 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_get_direction()
81 	ret = regmap_read(xra->regmap, to_reg(XRA_GCR, offset), &val);  in xra1403_get_direction()
91 static int xra1403_get(struct gpio_chip *chip, unsigned int offset)  in xra1403_get()  argument
95 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_get()
97 	ret = regmap_read(xra->regmap, to_reg(XRA_GSR, offset), &val);  in xra1403_get()
104 static void xra1403_set(struct gpio_chip *chip, unsigned int offset, int value)  in xra1403_set()  argument
107 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_set()
109 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),  in xra1403_set()
112 		dev_err(chip->parent, "Failed to set pin: %d, ret: %d\n",  in xra1403_set()
117 static void xra1403_dbg_show(struct seq_file *s, struct gpio_chip *chip)  in xra1403_dbg_show()  argument
120 	struct xra1403 *xra = gpiochip_get_data(chip);  in xra1403_dbg_show()
132 		regmap_read(xra->regmap, reg, &value[reg]);  in xra1403_dbg_show()
139 	for_each_requested_gpio(chip, i, label) {  in xra1403_dbg_show()
140 		seq_printf(s, " gpio-%-3d (%-12s) %s %s\n",  in xra1403_dbg_show()
141 			   chip->base + i, label,  in xra1403_dbg_show()
156 	xra = devm_kzalloc(&spi->dev, sizeof(*xra), GFP_KERNEL);  in xra1403_probe()
158 		return -ENOMEM;  in xra1403_probe()
160 	/* bring the chip out of reset if reset pin is provided*/  in xra1403_probe()
161 	reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);  in xra1403_probe()
163 		dev_warn(&spi->dev, "Could not get reset-gpios\n");  in xra1403_probe()
165 	xra->chip.direction_input = xra1403_direction_input;  in xra1403_probe()
166 	xra->chip.direction_output = xra1403_direction_output;  in xra1403_probe()
167 	xra->chip.get_direction = xra1403_get_direction;  in xra1403_probe()
168 	xra->chip.get = xra1403_get;  in xra1403_probe()
169 	xra->chip.set = xra1403_set;  in xra1403_probe()
171 	xra->chip.dbg_show = xra1403_dbg_show;  in xra1403_probe()
173 	xra->chip.ngpio = 16;  in xra1403_probe()
174 	xra->chip.label = "xra1403";  in xra1403_probe()
176 	xra->chip.base = -1;  in xra1403_probe()
177 	xra->chip.can_sleep = true;  in xra1403_probe()
178 	xra->chip.parent = &spi->dev;  in xra1403_probe()
179 	xra->chip.owner = THIS_MODULE;  in xra1403_probe()
181 	xra->regmap = devm_regmap_init_spi(spi, &xra1403_regmap_cfg);  in xra1403_probe()
182 	if (IS_ERR(xra->regmap)) {  in xra1403_probe()
183 		ret = PTR_ERR(xra->regmap);  in xra1403_probe()
184 		dev_err(&spi->dev, "Failed to allocate regmap: %d\n", ret);  in xra1403_probe()
188 	return devm_gpiochip_add_data(&spi->dev, &xra->chip, xra);  in xra1403_probe()