1 // SPDX-License-Identifier: GPL-2.0-only
3  *  i2c-versatile.c
10 #include <linux/i2c.h>
11 #include <linux/i2c-algo-bit.h>
20 #define SCL		(1 << 0)  macro
31 	struct i2c_versatile *i2c = data;  in i2c_versatile_setsda()  local
33 	writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));  in i2c_versatile_setsda()
38 	struct i2c_versatile *i2c = data;  in i2c_versatile_setscl()  local
40 	writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));  in i2c_versatile_setscl()
45 	struct i2c_versatile *i2c = data;  in i2c_versatile_getsda()  local
46 	return !!(readl(i2c->base + I2C_CONTROL) & SDA);  in i2c_versatile_getsda()
51 	struct i2c_versatile *i2c = data;  in i2c_versatile_getscl()  local
52 	return !!(readl(i2c->base + I2C_CONTROL) & SCL);  in i2c_versatile_getscl()
61 	.timeout = HZ,
66 	struct i2c_versatile *i2c;  in i2c_versatile_probe()  local
69 	i2c = devm_kzalloc(&dev->dev, sizeof(struct i2c_versatile), GFP_KERNEL);  in i2c_versatile_probe()
70 	if (!i2c)  in i2c_versatile_probe()
71 		return -ENOMEM;  in i2c_versatile_probe()
73 	i2c->base = devm_platform_get_and_ioremap_resource(dev, 0, NULL);  in i2c_versatile_probe()
74 	if (IS_ERR(i2c->base))  in i2c_versatile_probe()
75 		return PTR_ERR(i2c->base);  in i2c_versatile_probe()
77 	writel(SCL | SDA, i2c->base + I2C_CONTROLS);  in i2c_versatile_probe()
79 	i2c->adap.owner = THIS_MODULE;  in i2c_versatile_probe()
80 	strscpy(i2c->adap.name, "Versatile I2C adapter", sizeof(i2c->adap.name));  in i2c_versatile_probe()
81 	i2c->adap.algo_data = &i2c->algo;  in i2c_versatile_probe()
82 	i2c->adap.dev.parent = &dev->dev;  in i2c_versatile_probe()
83 	i2c->adap.dev.of_node = dev->dev.of_node;  in i2c_versatile_probe()
84 	i2c->algo = i2c_versatile_algo;  in i2c_versatile_probe()
85 	i2c->algo.data = i2c;  in i2c_versatile_probe()
87 	i2c->adap.nr = dev->id;  in i2c_versatile_probe()
88 	ret = i2c_bit_add_numbered_bus(&i2c->adap);  in i2c_versatile_probe()
92 	platform_set_drvdata(dev, i2c);  in i2c_versatile_probe()
99 	struct i2c_versatile *i2c = platform_get_drvdata(dev);  in i2c_versatile_remove()  local
101 	i2c_del_adapter(&i2c->adap);  in i2c_versatile_remove()
105 	{ .compatible = "arm,versatile-i2c", },
114 		.name	= "versatile-i2c",
132 MODULE_DESCRIPTION("ARM Versatile I2C bus driver");
134 MODULE_ALIAS("platform:versatile-i2c");