1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Platform driver for the PCA9564 I2C controller.
17 #include <linux/i2c.h>
20 #include <linux/i2c-algo-pca.h>
21 #include <linux/platform_data/i2c-pca-platform.h>
22 #include <linux/gpio/consumer.h>
32 	struct gpio_desc		*gpio;  member
44 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_readbyte8()  local
45 	return ioread8(i2c->reg_base + reg);  in i2c_pca_pf_readbyte8()
50 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_readbyte16()  local
51 	return ioread8(i2c->reg_base + reg * 2);  in i2c_pca_pf_readbyte16()
56 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_readbyte32()  local
57 	return ioread8(i2c->reg_base + reg * 4);  in i2c_pca_pf_readbyte32()
62 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_writebyte8()  local
63 	iowrite8(val, i2c->reg_base + reg);  in i2c_pca_pf_writebyte8()
68 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_writebyte16()  local
69 	iowrite8(val, i2c->reg_base + reg * 2);  in i2c_pca_pf_writebyte16()
74 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_writebyte32()  local
75 	iowrite8(val, i2c->reg_base + reg * 4);  in i2c_pca_pf_writebyte32()
81 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_waitforcompletion()  local
85 	if (i2c->irq) {  in i2c_pca_pf_waitforcompletion()
86 		ret = wait_event_timeout(i2c->wait,  in i2c_pca_pf_waitforcompletion()
87 			i2c->algo_data.read_byte(i2c, I2C_PCA_CON)  in i2c_pca_pf_waitforcompletion()
88 			& I2C_PCA_CON_SI, i2c->adap.timeout);  in i2c_pca_pf_waitforcompletion()
91 		timeout = jiffies + i2c->adap.timeout;  in i2c_pca_pf_waitforcompletion()
94 			if (i2c->algo_data.read_byte(i2c, I2C_PCA_CON)  in i2c_pca_pf_waitforcompletion()
106 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_dummyreset()  local
108 	dev_warn(&i2c->adap.dev, "No reset-pin found. Chip may get stuck!\n");  in i2c_pca_pf_dummyreset()
113 	struct i2c_pca_pf_data *i2c = pd;  in i2c_pca_pf_resetchip()  local
115 	gpiod_set_value(i2c->gpio, 1);  in i2c_pca_pf_resetchip()
117 	gpiod_set_value(i2c->gpio, 0);  in i2c_pca_pf_resetchip()
122 	struct i2c_pca_pf_data *i2c = dev_id;  in i2c_pca_pf_handler()  local
124 	if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)  in i2c_pca_pf_handler()
127 	wake_up(&i2c->wait);  in i2c_pca_pf_handler()
135 	struct i2c_pca_pf_data *i2c;  in i2c_pca_pf_probe()  local
138 				dev_get_platdata(&pdev->dev);  in i2c_pca_pf_probe()
139 	struct device_node *np = pdev->dev.of_node;  in i2c_pca_pf_probe()
148 	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);  in i2c_pca_pf_probe()
149 	if (!i2c)  in i2c_pca_pf_probe()
150 		return -ENOMEM;  in i2c_pca_pf_probe()
152 	i2c->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in i2c_pca_pf_probe()
153 	if (IS_ERR(i2c->reg_base))  in i2c_pca_pf_probe()
154 		return PTR_ERR(i2c->reg_base);  in i2c_pca_pf_probe()
157 	init_waitqueue_head(&i2c->wait);  in i2c_pca_pf_probe()
159 	i2c->io_base = res->start;  in i2c_pca_pf_probe()
160 	i2c->io_size = resource_size(res);  in i2c_pca_pf_probe()
161 	i2c->irq = irq;  in i2c_pca_pf_probe()
163 	i2c->adap.nr = pdev->id;  in i2c_pca_pf_probe()
164 	i2c->adap.owner = THIS_MODULE;  in i2c_pca_pf_probe()
165 	snprintf(i2c->adap.name, sizeof(i2c->adap.name),  in i2c_pca_pf_probe()
167 		 (unsigned long) res->start);  in i2c_pca_pf_probe()
168 	i2c->adap.algo_data = &i2c->algo_data;  in i2c_pca_pf_probe()
169 	i2c->adap.dev.parent = &pdev->dev;  in i2c_pca_pf_probe()
170 	i2c->adap.dev.of_node = np;  in i2c_pca_pf_probe()
172 	i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);  in i2c_pca_pf_probe()
173 	if (IS_ERR(i2c->gpio))  in i2c_pca_pf_probe()
174 		return PTR_ERR(i2c->gpio);  in i2c_pca_pf_probe()
176 	i2c->adap.timeout = HZ;  in i2c_pca_pf_probe()
177 	ret = device_property_read_u32(&pdev->dev, "clock-frequency",  in i2c_pca_pf_probe()
178 				       &i2c->algo_data.i2c_clock);  in i2c_pca_pf_probe()
180 		i2c->algo_data.i2c_clock = 59000;  in i2c_pca_pf_probe()
183 		i2c->adap.timeout = platform_data->timeout;  in i2c_pca_pf_probe()
184 		i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;  in i2c_pca_pf_probe()
187 	i2c->algo_data.data = i2c;  in i2c_pca_pf_probe()
188 	i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;  in i2c_pca_pf_probe()
189 	if (i2c->gpio)  in i2c_pca_pf_probe()
190 		i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;  in i2c_pca_pf_probe()
192 		i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;  in i2c_pca_pf_probe()
194 	switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {  in i2c_pca_pf_probe()
196 		i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;  in i2c_pca_pf_probe()
197 		i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;  in i2c_pca_pf_probe()
200 		i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;  in i2c_pca_pf_probe()
201 		i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;  in i2c_pca_pf_probe()
205 		i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;  in i2c_pca_pf_probe()
206 		i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;  in i2c_pca_pf_probe()
211 		ret = devm_request_irq(&pdev->dev, irq, i2c_pca_pf_handler,  in i2c_pca_pf_probe()
212 			IRQF_TRIGGER_FALLING, pdev->name, i2c);  in i2c_pca_pf_probe()
217 	ret = i2c_pca_add_numbered_bus(&i2c->adap);  in i2c_pca_pf_probe()
221 	platform_set_drvdata(pdev, i2c);  in i2c_pca_pf_probe()
223 	dev_info(&pdev->dev, "registered.\n");  in i2c_pca_pf_probe()
230 	struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);  in i2c_pca_pf_remove()  local
232 	i2c_del_adapter(&i2c->adap);  in i2c_pca_pf_remove()
250 		.name = "i2c-pca-platform",
258 MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver");