1 // SPDX-License-Identifier: GPL-2.0-or-later
14 #include <linux/gpio/consumer.h>
26 #define YT2_1380_FC_PDEV_NAME		"lenovo-yoga-tab2-pro-1380-fastcharger"
28 #define YT2_1380_FC_SERDEV_NAME		"serial0-0"
29 #define YT2_1380_FC_EXTCON_NAME		"i2c-lc824206xa"
51 	struct pinctrl_state *state = enable ? fc->gpio_state : fc->uart_state;  in yt2_1380_fc_set_gpio_mode()
54 	ret = pinctrl_select_state(fc->pinctrl, state);  in yt2_1380_fc_set_gpio_mode()
56 		dev_err(fc->dev, "Error %d setting pinctrl state\n", ret);  in yt2_1380_fc_set_gpio_mode()
66 	return extcon_get_state(fc->extcon, EXTCON_CHG_USB_DCP) > 0;  in yt2_1380_fc_dedicated_charger_connected()
71 	return extcon_get_state(fc->extcon, EXTCON_CHG_USB_FAST) > 0;  in yt2_1380_fc_fast_charger_connected()
84 		/* Set pins to UART mode (for charger disconnect and retries) */  in yt2_1380_fc_worker()
89 		/* Only try 12V charging if a dedicated charger is detected */  in yt2_1380_fc_worker()
94 		ret = serdev_device_write_buf(to_serdev_device(fc->dev), "SC", strlen("SC"));  in yt2_1380_fc_worker()
96 			dev_err(fc->dev, "Error %d writing to uart\n", ret);  in yt2_1380_fc_worker()
102 		/* Re-check a charger is still connected */  in yt2_1380_fc_worker()
107 		 * Now switch the lines to GPIO (output, high). The charger  in yt2_1380_fc_worker()
122 	dev_dbg(fc->dev, "Failed to switch to 12V charging (not the original charger?)\n");  in yt2_1380_fc_worker()
132 	schedule_work(&fc->work);  in yt2_1380_fc_extcon_evt()
142 	dev_dbg(&serdev->dev, "recv: %*ph\n", (int)len, data);  in yt2_1380_fc_receive()
153 	struct device *dev = &serdev->dev;  in yt2_1380_fc_serdev_probe()
159 		return -ENOMEM;  in yt2_1380_fc_serdev_probe()
161 	fc->dev = dev;  in yt2_1380_fc_serdev_probe()
162 	fc->nb.notifier_call = yt2_1380_fc_extcon_evt;  in yt2_1380_fc_serdev_probe()
163 	INIT_WORK(&fc->work, yt2_1380_fc_worker);  in yt2_1380_fc_serdev_probe()
166 	 * Do this first since it may return -EPROBE_DEFER.  in yt2_1380_fc_serdev_probe()
169 	fc->extcon = extcon_get_extcon_dev(YT2_1380_FC_EXTCON_NAME);  in yt2_1380_fc_serdev_probe()
170 	if (IS_ERR(fc->extcon))  in yt2_1380_fc_serdev_probe()
171 		return dev_err_probe(dev, PTR_ERR(fc->extcon), "getting extcon\n");  in yt2_1380_fc_serdev_probe()
173 	fc->pinctrl = devm_pinctrl_get(dev);  in yt2_1380_fc_serdev_probe()
174 	if (IS_ERR(fc->pinctrl))  in yt2_1380_fc_serdev_probe()
175 		return dev_err_probe(dev, PTR_ERR(fc->pinctrl), "getting pinctrl\n");  in yt2_1380_fc_serdev_probe()
179 	 * UART and GPIO modes.  in yt2_1380_fc_serdev_probe()
181 	fc->gpio_state = pinctrl_lookup_state(fc->pinctrl, "uart3_gpio");  in yt2_1380_fc_serdev_probe()
182 	fc->uart_state = pinctrl_lookup_state(fc->pinctrl, "uart3_uart");  in yt2_1380_fc_serdev_probe()
183 	if (IS_ERR(fc->gpio_state) || IS_ERR(fc->uart_state))  in yt2_1380_fc_serdev_probe()
184 		return dev_err_probe(dev, -EINVAL, "getting pinctrl states\n");  in yt2_1380_fc_serdev_probe()
190 	fc->uart3_txd = devm_gpiod_get(dev, "uart3_txd", GPIOD_OUT_HIGH);  in yt2_1380_fc_serdev_probe()
191 	if (IS_ERR(fc->uart3_txd))  in yt2_1380_fc_serdev_probe()
192 		return dev_err_probe(dev, PTR_ERR(fc->uart3_txd), "getting uart3_txd gpio\n");  in yt2_1380_fc_serdev_probe()
194 	fc->uart3_rxd = devm_gpiod_get(dev, "uart3_rxd", GPIOD_OUT_HIGH);  in yt2_1380_fc_serdev_probe()
195 	if (IS_ERR(fc->uart3_rxd))  in yt2_1380_fc_serdev_probe()
196 		return dev_err_probe(dev, PTR_ERR(fc->uart3_rxd), "getting uart3_rxd gpio\n");  in yt2_1380_fc_serdev_probe()
211 	ret = devm_extcon_register_notifier_all(dev, fc->extcon, &fc->nb);  in yt2_1380_fc_serdev_probe()
215 	/* In case the extcon already has detected a DCP charger */  in yt2_1380_fc_serdev_probe()
216 	schedule_work(&fc->work);  in yt2_1380_fc_serdev_probe()
232 			  "INT33FC:00", "uart3_grp_gpio", "gpio"),
247 	/* And create the serdev to talk to the charger over the UART3 pins */  in yt2_1380_fc_pdev_probe()
257 		ret = -ENOMEM;  in yt2_1380_fc_pdev_probe()
263 		dev_err_probe(&pdev->dev, ret, "adding serdev\n");  in yt2_1380_fc_pdev_probe()
269 	 * serdev device <-> driver matching relies on OF or ACPI matches and  in yt2_1380_fc_pdev_probe()
272 	ret = device_driver_attach(&yt2_1380_fc_serdev_driver.driver, &serdev->dev);  in yt2_1380_fc_pdev_probe()
275 		ret = (ret == -EAGAIN) ? -EPROBE_DEFER : ret;  in yt2_1380_fc_pdev_probe()
276 		dev_err_probe(&pdev->dev, ret, "attaching serdev driver\n");  in yt2_1380_fc_pdev_probe()
314 	 * device_driver_attach() on the serdev, serdev-driver pair.  in yt2_1380_fc_module_init()