1 // SPDX-License-Identifier: GPL-2.0
23 #define REG_ID		0x80
24 #define REG_PORTA	0x81
25 #define REG_PORTB	0x82
26 #define REG_PORTC	0x83
27 #define REG_POWERON	0x85
28 #define REG_PWM		0x86
29 #define REG_ADDR_L	0x8c
30 #define REG_ADDR_H	0x8d
31 #define REG_WRITE_DATA_H	0x90
32 #define REG_WRITE_DATA_L	0x91
34 #define PA_LCD_DITHB		BIT(0)
39 #define PB_BRIDGE_PWRDNX_N	BIT(0)
43 #define PC_LED_EN		BIT(0)
84 	state->port_states[reg - REG_PORTA] = val;  in attiny_set_port_state()
85 	return regmap_write(state->regmap, reg, val);  in attiny_set_port_state()
90 	return state->port_states[reg - REG_PORTA];  in attiny_get_port_state()
97 	mutex_lock(&state->lock);  in attiny_lcd_power_enable()
100 	attiny_set_port_state(state, REG_PORTC, 0);  in attiny_lcd_power_enable()
118 	mutex_unlock(&state->lock);  in attiny_lcd_power_enable()
120 	return 0;  in attiny_lcd_power_enable()
127 	mutex_lock(&state->lock);  in attiny_lcd_power_disable()
129 	regmap_write(rdev->regmap, REG_PWM, 0);  in attiny_lcd_power_disable()
132 	attiny_set_port_state(state, REG_PORTA, 0);  in attiny_lcd_power_disable()
136 	attiny_set_port_state(state, REG_PORTC, 0);  in attiny_lcd_power_disable()
139 	mutex_unlock(&state->lock);  in attiny_lcd_power_disable()
141 	return 0;  in attiny_lcd_power_disable()
150 	mutex_lock(&state->lock);  in attiny_lcd_power_is_enabled()
152 	for (i = 0; i < 10; i++) {  in attiny_lcd_power_is_enabled()
153 		ret = regmap_read(rdev->regmap, REG_PORTC, &data);  in attiny_lcd_power_is_enabled()
159 	mutex_unlock(&state->lock);  in attiny_lcd_power_is_enabled()
161 	if (ret < 0)  in attiny_lcd_power_is_enabled()
180 	.name	= "tc358762-power",
189 	struct regmap *regmap = state->regmap;  in attiny_update_status()
193 	mutex_lock(&state->lock);  in attiny_update_status()
195 	for (i = 0; i < 10; i++) {  in attiny_update_status()
201 	mutex_unlock(&state->lock);  in attiny_update_status()
223 	mutex_lock(&state->lock);  in attiny_gpio_set()
235 		regmap_write(state->regmap, REG_ADDR_H, 0x04);  in attiny_gpio_set()
237 		regmap_write(state->regmap, REG_ADDR_L, 0x7c);  in attiny_gpio_set()
239 		regmap_write(state->regmap, REG_WRITE_DATA_H, 0x00);  in attiny_gpio_set()
241 		regmap_write(state->regmap, REG_WRITE_DATA_L, 0x00);  in attiny_gpio_set()
246 	mutex_unlock(&state->lock);  in attiny_gpio_set()
253 	u8 data_buf[1] = { 0, };  in attiny_i2c_read()
257 	msgs[0].addr = client->addr;  in attiny_i2c_read()
258 	msgs[0].flags = 0;  in attiny_i2c_read()
259 	msgs[0].len = ARRAY_SIZE(addr_buf);  in attiny_i2c_read()
260 	msgs[0].buf = addr_buf;  in attiny_i2c_read()
262 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));  in attiny_i2c_read()
264 		return -EIO;  in attiny_i2c_read()
269 	msgs[0].addr = client->addr;  in attiny_i2c_read()
270 	msgs[0].flags = I2C_M_RD;  in attiny_i2c_read()
271 	msgs[0].len = 1;  in attiny_i2c_read()
272 	msgs[0].buf = data_buf;  in attiny_i2c_read()
274 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));  in attiny_i2c_read()
276 		return -EIO;  in attiny_i2c_read()
278 	*buf = data_buf[0];  in attiny_i2c_read()
279 	return 0;  in attiny_i2c_read()
297 	state = devm_kzalloc(&i2c->dev, sizeof(*state), GFP_KERNEL);  in attiny_i2c_probe()
299 		return -ENOMEM;  in attiny_i2c_probe()
301 	mutex_init(&state->lock);  in attiny_i2c_probe()
307 		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",  in attiny_i2c_probe()
313 	if (ret < 0) {  in attiny_i2c_probe()
314 		dev_err(&i2c->dev, "Failed to read REG_ID reg: %d\n", ret);  in attiny_i2c_probe()
319 	case 0xde: /* ver 1 */  in attiny_i2c_probe()
320 	case 0xc3: /* ver 2 */  in attiny_i2c_probe()
323 		dev_err(&i2c->dev, "Unknown Atmel firmware revision: 0x%02x\n", data);  in attiny_i2c_probe()
324 		ret = -ENODEV;  in attiny_i2c_probe()
328 	regmap_write(regmap, REG_POWERON, 0);  in attiny_i2c_probe()
330 	regmap_write(regmap, REG_PWM, 0);  in attiny_i2c_probe()
332 	config.dev = &i2c->dev;  in attiny_i2c_probe()
334 	config.of_node = i2c->dev.of_node;  in attiny_i2c_probe()
338 	rdev = devm_regulator_register(&i2c->dev, &attiny_regulator, &config);  in attiny_i2c_probe()
340 		dev_err(&i2c->dev, "Failed to register ATTINY regulator\n");  in attiny_i2c_probe()
346 	props.max_brightness = 0xff;  in attiny_i2c_probe()
348 	state->regmap = regmap;  in attiny_i2c_probe()
350 	bl = devm_backlight_device_register(&i2c->dev, dev_name(&i2c->dev),  in attiny_i2c_probe()
351 					    &i2c->dev, state, &attiny_bl,  in attiny_i2c_probe()
358 	bl->props.brightness = 0xff;  in attiny_i2c_probe()
360 	state->gc.parent = &i2c->dev;  in attiny_i2c_probe()
361 	state->gc.label = i2c->name;  in attiny_i2c_probe()
362 	state->gc.owner = THIS_MODULE;  in attiny_i2c_probe()
363 	state->gc.base = -1;  in attiny_i2c_probe()
364 	state->gc.ngpio = NUM_GPIO;  in attiny_i2c_probe()
366 	state->gc.set = attiny_gpio_set;  in attiny_i2c_probe()
367 	state->gc.get_direction = attiny_gpio_get_direction;  in attiny_i2c_probe()
368 	state->gc.can_sleep = true;  in attiny_i2c_probe()
370 	ret = devm_gpiochip_add_data(&i2c->dev, &state->gc, state);  in attiny_i2c_probe()
372 		dev_err(&i2c->dev, "Failed to create gpiochip: %d\n", ret);  in attiny_i2c_probe()
376 	return 0;  in attiny_i2c_probe()
379 	mutex_destroy(&state->lock);  in attiny_i2c_probe()
388 	mutex_destroy(&state->lock);  in attiny_i2c_remove()
392 	{ .compatible = "raspberrypi,7inch-touchscreen-panel-regulator" },
409 MODULE_DESCRIPTION("Regulator device driver for Raspberry Pi 7-inch touchscreen");