1 // SPDX-License-Identifier: GPL-2.0-only
10  * The Amstrad Delta keyboard (aka mailboard) uses normal PC-AT style serial
17  * However, when used with the E3 mailboard that producecs non-standard
21 #include <linux/platform_data/ams-delta-fiq.h>
28 #define DRIVER_NAME	"ams-delta-serio"
42 	int i, parity = 0;  in check_data()  local
46 		dev_warn(&serio->dev, "invalid stop bit, data=0x%X\n", data);  in check_data()
49 	/* calculate the parity */  in check_data()
52 			parity++;  in check_data()
54 	/* it should be odd */  in check_data()
55 	if (!(parity & 0x01)) {  in check_data()
56 		dev_warn(&serio->dev,  in check_data()
57 			 "parity check failed, data=0x%X parity=0x%X\n", data,  in check_data()
58 			 parity);  in check_data()
67 	int *circ_buff = &priv->fiq_buffer[FIQ_CIRC_BUFF];  in ams_delta_serio_interrupt()
71 	priv->fiq_buffer[FIQ_IRQ_PEND] = 0;  in ams_delta_serio_interrupt()
77 	while (priv->fiq_buffer[FIQ_KEYS_CNT] > 0) {  in ams_delta_serio_interrupt()
79 		data = circ_buff[priv->fiq_buffer[FIQ_HEAD_OFFSET]++];  in ams_delta_serio_interrupt()
80 		priv->fiq_buffer[FIQ_KEYS_CNT]--;  in ams_delta_serio_interrupt()
81 		if (priv->fiq_buffer[FIQ_HEAD_OFFSET] ==  in ams_delta_serio_interrupt()
82 		    priv->fiq_buffer[FIQ_BUF_LEN])  in ams_delta_serio_interrupt()
83 			priv->fiq_buffer[FIQ_HEAD_OFFSET] = 0;  in ams_delta_serio_interrupt()
85 		dfl = check_data(priv->serio, data);  in ams_delta_serio_interrupt()
87 		serio_interrupt(priv->serio, scancode, dfl);  in ams_delta_serio_interrupt()
94 	struct ams_delta_serio *priv = serio->port_data;  in ams_delta_serio_open()
97 	return regulator_enable(priv->vcc);  in ams_delta_serio_open()
102 	struct ams_delta_serio *priv = serio->port_data;  in ams_delta_serio_close()
105 	regulator_disable(priv->vcc);  in ams_delta_serio_close()
114 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in ams_delta_serio_init()
116 		return -ENOMEM;  in ams_delta_serio_init()
118 	priv->fiq_buffer = pdev->dev.platform_data;  in ams_delta_serio_init()
119 	if (!priv->fiq_buffer)  in ams_delta_serio_init()
120 		return -EINVAL;  in ams_delta_serio_init()
122 	priv->vcc = devm_regulator_get(&pdev->dev, "vcc");  in ams_delta_serio_init()
123 	if (IS_ERR(priv->vcc)) {  in ams_delta_serio_init()
124 		err = PTR_ERR(priv->vcc);  in ams_delta_serio_init()
125 		dev_err(&pdev->dev, "regulator request failed (%d)\n", err);  in ams_delta_serio_init()
127 		 * When running on a non-dt platform and requested regulator  in ams_delta_serio_init()
129 		 * -EPROBE_DEFER as it is not able to justify if the regulator  in ams_delta_serio_init()
133 		 * if sufficient.  Hence, if we get -ENODEV here, let's convert  in ams_delta_serio_init()
134 		 * it to -EPROBE_DEFER and wait for the board to decide or  in ams_delta_serio_init()
137 		if (err == -ENODEV)  in ams_delta_serio_init()
138 			err = -EPROBE_DEFER;  in ams_delta_serio_init()
144 		return -ENXIO;  in ams_delta_serio_init()
146 	err = devm_request_irq(&pdev->dev, irq, ams_delta_serio_interrupt,  in ams_delta_serio_init()
149 		dev_err(&pdev->dev, "IRQ request failed (%d)\n", err);  in ams_delta_serio_init()
155 		return -ENOMEM;  in ams_delta_serio_init()
157 	priv->serio = serio;  in ams_delta_serio_init()
159 	serio->id.type = SERIO_8042;  in ams_delta_serio_init()
160 	serio->open = ams_delta_serio_open;  in ams_delta_serio_init()
161 	serio->close = ams_delta_serio_close;  in ams_delta_serio_init()
162 	strscpy(serio->name, "AMS DELTA keyboard adapter", sizeof(serio->name));  in ams_delta_serio_init()
163 	strscpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));  in ams_delta_serio_init()
164 	serio->dev.parent = &pdev->dev;  in ams_delta_serio_init()
165 	serio->port_data = priv;  in ams_delta_serio_init()
171 	dev_info(&serio->dev, "%s\n", serio->name);  in ams_delta_serio_init()
180 	serio_unregister_port(priv->serio);  in ams_delta_serio_exit()