1 // SPDX-License-Identifier: GPL-2.0-only
3  * GPIO driver for EXAR XRA1403 16-bit GPIO expander
24 #define XRA_PUR   0x08 /* Input Internal Pull-up Resistor Enable/Disable */
26 #define XRA_TSCR  0x0C /* Output Three-State Control */
46 static unsigned int to_reg(unsigned int reg, unsigned int offset)  in to_reg()  argument
48 	return reg + (offset > 7);  in to_reg()
51 static int xra1403_direction_input(struct gpio_chip *chip, unsigned int offset)  in xra1403_direction_input()  argument
55 	return regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),  in xra1403_direction_input()
56 			BIT(offset % 8), BIT(offset % 8));  in xra1403_direction_input()
59 static int xra1403_direction_output(struct gpio_chip *chip, unsigned int offset,  in xra1403_direction_output()  argument
65 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_GCR, offset),  in xra1403_direction_output()
66 			BIT(offset % 8), 0);  in xra1403_direction_output()
70 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),  in xra1403_direction_output()
71 			BIT(offset % 8), value ? BIT(offset % 8) : 0);  in xra1403_direction_output()
76 static int xra1403_get_direction(struct gpio_chip *chip, unsigned int offset)  in xra1403_get_direction()  argument
82 	ret = regmap_read(xra->regmap, to_reg(XRA_GCR, offset), &val);  in xra1403_get_direction()
86 	if (val & BIT(offset % 8))  in xra1403_get_direction()
92 static int xra1403_get(struct gpio_chip *chip, unsigned int offset)  in xra1403_get()  argument
98 	ret = regmap_read(xra->regmap, to_reg(XRA_GSR, offset), &val);  in xra1403_get()
102 	return !!(val & BIT(offset % 8));  in xra1403_get()
105 static void xra1403_set(struct gpio_chip *chip, unsigned int offset, int value)  in xra1403_set()  argument
110 	ret = regmap_update_bits(xra->regmap, to_reg(XRA_OCR, offset),  in xra1403_set()
111 			BIT(offset % 8), value ? BIT(offset % 8) : 0);  in xra1403_set()
113 		dev_err(chip->parent, "Failed to set pin: %d, ret: %d\n",  in xra1403_set()
114 				offset, ret);  in xra1403_set()
120 	int reg;  in xra1403_dbg_show()  local
128 	seq_puts(s, "xra reg:");  in xra1403_dbg_show()
129 	for (reg = 0; reg <= XRA_LAST; reg++)  in xra1403_dbg_show()
130 		seq_printf(s, " %2.2x", reg);  in xra1403_dbg_show()
132 	for (reg = 0; reg < XRA_LAST; reg++) {  in xra1403_dbg_show()
133 		regmap_read(xra->regmap, reg, &value[reg]);  in xra1403_dbg_show()
134 		seq_printf(s, " %2.2x", value[reg]);  in xra1403_dbg_show()
141 		seq_printf(s, " gpio-%-3d (%-12s) %s %s\n",  in xra1403_dbg_show()
142 			   chip->base + i, label,  in xra1403_dbg_show()
157 	xra = devm_kzalloc(&spi->dev, sizeof(*xra), GFP_KERNEL);  in xra1403_probe()
159 		return -ENOMEM;  in xra1403_probe()
162 	reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);  in xra1403_probe()
164 		dev_warn(&spi->dev, "Could not get reset-gpios\n");  in xra1403_probe()
166 	xra->chip.direction_input = xra1403_direction_input;  in xra1403_probe()
167 	xra->chip.direction_output = xra1403_direction_output;  in xra1403_probe()
168 	xra->chip.get_direction = xra1403_get_direction;  in xra1403_probe()
169 	xra->chip.get = xra1403_get;  in xra1403_probe()
170 	xra->chip.set = xra1403_set;  in xra1403_probe()
172 	xra->chip.dbg_show = xra1403_dbg_show;  in xra1403_probe()
174 	xra->chip.ngpio = 16;  in xra1403_probe()
175 	xra->chip.label = "xra1403";  in xra1403_probe()
177 	xra->chip.base = -1;  in xra1403_probe()
178 	xra->chip.can_sleep = true;  in xra1403_probe()
179 	xra->chip.parent = &spi->dev;  in xra1403_probe()
180 	xra->chip.owner = THIS_MODULE;  in xra1403_probe()
182 	xra->regmap = devm_regmap_init_spi(spi, &xra1403_regmap_cfg);  in xra1403_probe()
183 	if (IS_ERR(xra->regmap)) {  in xra1403_probe()
184 		ret = PTR_ERR(xra->regmap);  in xra1403_probe()
185 		dev_err(&spi->dev, "Failed to allocate regmap: %d\n", ret);  in xra1403_probe()
189 	return devm_gpiochip_add_data(&spi->dev, &xra->chip, xra);  in xra1403_probe()