11  * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more
14  * - DIN must be stable at the rising edge of clock.
15  * - when writing:
16  *   - always clock in 16 clocks at once
17  *   - at DIN: D15 first, D0 last
18  *   - D0..D7 = databyte, D8..D14 = commandbyte
19  *   - D15 = low -> write command
20  * - when reading
21  *   - always clock in 16 clocks at once
22  *   - at DIN: D15 first, D0 last
23  *   - D0..D7 = dummy, D8..D14 = register address
24  *   - D15 = high -> read command
25  *   - raise CS and assert it again
26  *   - always clock in 16 clocks at once
27  *   - at DOUT: D15 first, D0 last
28  *   - D0..D7 contains the data from the first cycle
62 	config = &ts->port_config[offset >> 2];  in max7301_direction_input()
64 	if (ts->input_pullup_active & BIT(offset))  in max7301_direction_input()
69 	mutex_lock(&ts->lock);  in max7301_direction_input()
74 	ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);  in max7301_direction_input()
76 	mutex_unlock(&ts->lock);  in max7301_direction_input()
84 		ts->out_level |= 1 << offset;  in __max7301_set()
85 		return ts->write(ts->dev, 0x20 + offset, 0x01);  in __max7301_set()
87 		ts->out_level &= ~(1 << offset);  in __max7301_set()
88 		return ts->write(ts->dev, 0x20 + offset, 0x00);  in __max7301_set()
104 	config = &ts->port_config[offset >> 2];  in max7301_direction_output()
106 	mutex_lock(&ts->lock);  in max7301_direction_output()
114 		ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);  in max7301_direction_output()
116 	mutex_unlock(&ts->lock);  in max7301_direction_output()
124 	int config, level = -EINVAL;  in max7301_get()
129 	mutex_lock(&ts->lock);  in max7301_get()
131 	config = (ts->port_config[offset >> 2] >> ((offset & 3) << 1))  in max7301_get()
137 		level =  !!(ts->out_level & (1 << offset));  in max7301_get()
142 		level = ts->read(ts->dev, 0x20 + offset) & 0x01;  in max7301_get()
144 	mutex_unlock(&ts->lock);  in max7301_get()
156 	mutex_lock(&ts->lock);  in max7301_set()
160 	mutex_unlock(&ts->lock);  in max7301_set()
165 	struct device *dev = ts->dev;  in __max730x_probe()
171 	mutex_init(&ts->lock);  in __max730x_probe()
175 	ts->write(dev, 0x04, 0x01);  in __max730x_probe()
178 		ts->input_pullup_active = pdata->input_pullup_active;  in __max730x_probe()
179 		ts->chip.base = pdata->base;  in __max730x_probe()
181 		ts->chip.base = -1;  in __max730x_probe()
183 	ts->chip.label = dev->driver->name;  in __max730x_probe()
185 	ts->chip.direction_input = max7301_direction_input;  in __max730x_probe()
186 	ts->chip.get = max7301_get;  in __max730x_probe()
187 	ts->chip.direction_output = max7301_direction_output;  in __max730x_probe()
188 	ts->chip.set = max7301_set;  in __max730x_probe()
190 	ts->chip.ngpio = PIN_NUMBER;  in __max730x_probe()
191 	ts->chip.can_sleep = true;  in __max730x_probe()
192 	ts->chip.parent = dev;  in __max730x_probe()
193 	ts->chip.owner = THIS_MODULE;  in __max730x_probe()
195 	ret = gpiochip_add_data(&ts->chip, ts);  in __max730x_probe()
211 		ts->port_config[i] = 0xAA;  in __max730x_probe()
213 			int offset = (i - 1) * 4 + j;  in __max730x_probe()
214 			ret = max7301_direction_input(&ts->chip, offset);  in __max730x_probe()
223 	mutex_destroy(&ts->lock);  in __max730x_probe()
233 		return -ENODEV;  in __max730x_remove()
236 	ts->write(dev, 0x04, 0x00);  in __max730x_remove()
237 	gpiochip_remove(&ts->chip);  in __max730x_remove()
238 	mutex_destroy(&ts->lock);  in __max730x_remove()
245 MODULE_DESCRIPTION("MAX730x GPIO-Expanders, generic parts");