1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * GPIO driver for the SMSC SCH311x Super-I/O chips
20 #define DRV_NAME			"gpio-sch311x"
44 	spinlock_t lock;		/* lock for this GPIO block */  member
93  *	Super-IO functions
102 		return -EBUSY;  in sch311x_sio_enter()
132 static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset)  in sch311x_gpio_request()  argument
136 	if (block->config_regs[offset] == 0) /* GPIO is not available */  in sch311x_gpio_request()
137 		return -ENODEV;  in sch311x_gpio_request()
139 	if (!request_region(block->runtime_reg + block->config_regs[offset],  in sch311x_gpio_request()
141 		dev_err(chip->parent, "Failed to request region 0x%04x.\n",  in sch311x_gpio_request()
142 			block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_request()
143 		return -EBUSY;  in sch311x_gpio_request()
148 static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset)  in sch311x_gpio_free()  argument
152 	if (block->config_regs[offset] == 0) /* GPIO is not available */  in sch311x_gpio_free()
155 	release_region(block->runtime_reg + block->config_regs[offset], 1);  in sch311x_gpio_free()
158 static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset)  in sch311x_gpio_get()  argument
163 	spin_lock(&block->lock);  in sch311x_gpio_get()
164 	data = inb(block->runtime_reg + block->data_reg);  in sch311x_gpio_get()
165 	spin_unlock(&block->lock);  in sch311x_gpio_get()
167 	return !!(data & BIT(offset));  in sch311x_gpio_get()
171 			       unsigned offset, int value)  in __sch311x_gpio_set()  argument
173 	u8 data = inb(block->runtime_reg + block->data_reg);  in __sch311x_gpio_set()
175 		data |= BIT(offset);  in __sch311x_gpio_set()
177 		data &= ~BIT(offset);  in __sch311x_gpio_set()
178 	outb(data, block->runtime_reg + block->data_reg);  in __sch311x_gpio_set()
181 static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset,  in sch311x_gpio_set()  argument
186 	spin_lock(&block->lock);  in sch311x_gpio_set()
187 	__sch311x_gpio_set(block, offset, value);  in sch311x_gpio_set()
188 	spin_unlock(&block->lock);  in sch311x_gpio_set()
191 static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)  in sch311x_gpio_direction_in()  argument
196 	spin_lock(&block->lock);  in sch311x_gpio_direction_in()
197 	data = inb(block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_direction_in()
199 	outb(data, block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_direction_in()
200 	spin_unlock(&block->lock);  in sch311x_gpio_direction_in()
205 static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset,  in sch311x_gpio_direction_out()  argument
211 	spin_lock(&block->lock);  in sch311x_gpio_direction_out()
213 	data = inb(block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_direction_out()
215 	outb(data, block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_direction_out()
216 	__sch311x_gpio_set(block, offset, value);  in sch311x_gpio_direction_out()
218 	spin_unlock(&block->lock);  in sch311x_gpio_direction_out()
222 static int sch311x_gpio_get_direction(struct gpio_chip *chip, unsigned offset)  in sch311x_gpio_get_direction()  argument
227 	spin_lock(&block->lock);  in sch311x_gpio_get_direction()
228 	data = inb(block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_get_direction()
229 	spin_unlock(&block->lock);  in sch311x_gpio_get_direction()
237 static int sch311x_gpio_set_config(struct gpio_chip *chip, unsigned offset,  in sch311x_gpio_set_config()  argument
246 		spin_lock(&block->lock);  in sch311x_gpio_set_config()
247 		data = inb(block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_set_config()
249 		outb(data, block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_set_config()
250 		spin_unlock(&block->lock);  in sch311x_gpio_set_config()
253 		spin_lock(&block->lock);  in sch311x_gpio_set_config()
254 		data = inb(block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_set_config()
256 		outb(data, block->runtime_reg + block->config_regs[offset]);  in sch311x_gpio_set_config()
257 		spin_unlock(&block->lock);  in sch311x_gpio_set_config()
262 	return -ENOTSUPP;  in sch311x_gpio_set_config()
267 	struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev);  in sch311x_gpio_probe()
273 	if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6,  in sch311x_gpio_probe()
275 		dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n",  in sch311x_gpio_probe()
276 			pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5);  in sch311x_gpio_probe()
277 		return -EBUSY;  in sch311x_gpio_probe()
280 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in sch311x_gpio_probe()
282 		return -ENOMEM;  in sch311x_gpio_probe()
284 	for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {  in sch311x_gpio_probe()
285 		block = &priv->blocks[i];  in sch311x_gpio_probe()
287 		spin_lock_init(&block->lock);  in sch311x_gpio_probe()
289 		block->chip.label = DRV_NAME;  in sch311x_gpio_probe()
290 		block->chip.owner = THIS_MODULE;  in sch311x_gpio_probe()
291 		block->chip.request = sch311x_gpio_request;  in sch311x_gpio_probe()
292 		block->chip.free = sch311x_gpio_free;  in sch311x_gpio_probe()
293 		block->chip.direction_input = sch311x_gpio_direction_in;  in sch311x_gpio_probe()
294 		block->chip.direction_output = sch311x_gpio_direction_out;  in sch311x_gpio_probe()
295 		block->chip.get_direction = sch311x_gpio_get_direction;  in sch311x_gpio_probe()
296 		block->chip.set_config = sch311x_gpio_set_config;  in sch311x_gpio_probe()
297 		block->chip.get = sch311x_gpio_get;  in sch311x_gpio_probe()
298 		block->chip.set = sch311x_gpio_set;  in sch311x_gpio_probe()
299 		block->chip.ngpio = 8;  in sch311x_gpio_probe()
300 		block->chip.parent = &pdev->dev;  in sch311x_gpio_probe()
301 		block->chip.base = sch311x_gpio_blocks[i].base;  in sch311x_gpio_probe()
302 		block->config_regs = sch311x_gpio_blocks[i].config_regs;  in sch311x_gpio_probe()
303 		block->data_reg = sch311x_gpio_blocks[i].data_reg;  in sch311x_gpio_probe()
304 		block->runtime_reg = pdata->runtime_reg;  in sch311x_gpio_probe()
306 		err = devm_gpiochip_add_data(&pdev->dev, &block->chip, block);  in sch311x_gpio_probe()
308 			dev_err(&pdev->dev,  in sch311x_gpio_probe()
312 		dev_info(&pdev->dev,  in sch311x_gpio_probe()
352 		err = -ENODEV;  in sch311x_detect()
368 		err = -ENODEV;  in sch311x_detect()
387 	sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1);  in sch311x_gpio_pdev_add()
389 		return -ENOMEM;  in sch311x_gpio_pdev_add()
420 		return -ENODEV;  in sch311x_gpio_init()
449 MODULE_ALIAS("platform:gpio-sch311x");