1 // SPDX-License-Identifier: GPL-2.0+
3  * Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
14  * Also the Polarity Inversion feature is not supported now.
19  * 3. Support Polarity Inversion
30 #include <dt-bindings/gpio/gpio.h>
53  * struct pca953x_info - Data for pca953x
57  * @invert: Polarity inversion or not
61  * @reg_output: array to hold the value of output registers
67 	int invert;  member
79 	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);  in pca953x_write_single()
96 	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);  in pca953x_read_single()
117 	if (info->gpio_count <= 8) {  in pca953x_read_regs()
119 	} else if (info->gpio_count <= 16) {  in pca953x_read_regs()
120 		ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);  in pca953x_read_regs()
121 	} else if (info->gpio_count == 40) {  in pca953x_read_regs()
124 				  info->bank_count);  in pca953x_read_regs()
127 		return -EINVAL;  in pca953x_read_regs()
138 	if (info->gpio_count <= 8) {  in pca953x_write_regs()
140 	} else if (info->gpio_count <= 16) {  in pca953x_write_regs()
141 		ret = dm_i2c_write(dev, reg << 1, val, info->bank_count);  in pca953x_write_regs()
142 	} else if (info->gpio_count == 40) {  in pca953x_write_regs()
144 		ret = dm_i2c_write(dev, (reg << 3) | 0x80, val, info->bank_count);  in pca953x_write_regs()
146 		return -EINVAL;  in pca953x_write_regs()
159 	/*0: output; 1: input */  in pca953x_is_output()
160 	return !(info->reg_direction[bank] & (1 << off));  in pca953x_is_output()
186 		val = info->reg_output[bank] | (1 << off);  in pca953x_set_value()
188 		val = info->reg_output[bank] & ~(1 << off);  in pca953x_set_value()
194 	info->reg_output[bank] = val;  in pca953x_set_value()
208 		val = info->reg_direction[bank] | (1 << off);  in pca953x_set_direction()
210 		val = info->reg_direction[bank] & ~(1 << off);  in pca953x_set_direction()
216 	info->reg_direction[bank] = val;  in pca953x_set_direction()
228 	/* Configure output value. */  in pca953x_direction_output()
231 	/* Configure direction as output. */  in pca953x_direction_output()
248 	desc->offset = args->args[0];  in pca953x_xlate()
249 	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;  in pca953x_xlate()
277 		return -ENODEV;  in pca953x_probe()
279 	info->addr = addr;  in pca953x_probe()
283 	info->gpio_count = driver_data & PCA_GPIO_MASK;  in pca953x_probe()
284 	if (info->gpio_count > MAX_BANK * BANK_SZ) {  in pca953x_probe()
286 		return -EINVAL;  in pca953x_probe()
289 	info->chip_type = PCA_CHIP_TYPE(driver_data);  in pca953x_probe()
290 	if (info->chip_type != PCA953X_TYPE) {  in pca953x_probe()
292 		return -EINVAL;  in pca953x_probe()
295 	info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);  in pca953x_probe()
297 	ret = pca953x_read_regs(dev, PCA953X_OUTPUT, info->reg_output);  in pca953x_probe()
299 		dev_err(dev, "Error reading output register\n");  in pca953x_probe()
303 	ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);  in pca953x_probe()
312 		memcpy(label, tmp, sizeof(label) - 1);  in pca953x_probe()
313 		label[sizeof(label) - 1] = '\0';  in pca953x_probe()
314 		snprintf(name, sizeof(name), "%s@%x_", label, info->addr);  in pca953x_probe()
316 		snprintf(name, sizeof(name), "gpio@%x_", info->addr);  in pca953x_probe()
319 	/* Clear the polarity registers to no invert */  in pca953x_probe()
323 		dev_err(dev, "Error writing invert register\n");  in pca953x_probe()
329 		return -ENOMEM;  in pca953x_probe()
330 	uc_priv->bank_name = str;  in pca953x_probe()
331 	uc_priv->gpio_count = info->gpio_count;  in pca953x_probe()