1 // SPDX-License-Identifier: GPL-2.0-only
3  * Marvell NFC-over-I2C driver: I2C interface related functions
10 #include <linux/i2c.h>
21 	struct i2c_client *i2c;  member
25 static int nfcmrvl_i2c_read(struct nfcmrvl_i2c_drv_data *drv_data,  in nfcmrvl_i2c_read()
28 	int ret;  in nfcmrvl_i2c_read()
32 	ret = i2c_master_recv(drv_data->i2c, (u8 *)&nci_hdr, NCI_CTRL_HDR_SIZE);  in nfcmrvl_i2c_read()
34 		nfc_err(&drv_data->i2c->dev, "cannot read NCI header\n");  in nfcmrvl_i2c_read()
35 		return -EBADMSG;  in nfcmrvl_i2c_read()
38 	*skb = nci_skb_alloc(drv_data->priv->ndev,  in nfcmrvl_i2c_read()
41 		return -ENOMEM;  in nfcmrvl_i2c_read()
48 		ret = i2c_master_recv(drv_data->i2c,  in nfcmrvl_i2c_read()
53 			nfc_err(&drv_data->i2c->dev,  in nfcmrvl_i2c_read()
57 			return -EBADMSG;  in nfcmrvl_i2c_read()
64 static irqreturn_t nfcmrvl_i2c_int_irq_thread_fn(int irq, void *drv_data_ptr)  in nfcmrvl_i2c_int_irq_thread_fn()
68 	int ret;  in nfcmrvl_i2c_int_irq_thread_fn()
70 	if (!drv_data->priv)  in nfcmrvl_i2c_int_irq_thread_fn()
73 	if (test_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags))  in nfcmrvl_i2c_int_irq_thread_fn()
79 	case -EREMOTEIO:  in nfcmrvl_i2c_int_irq_thread_fn()
80 		set_bit(NFCMRVL_PHY_ERROR, &drv_data->priv->flags);  in nfcmrvl_i2c_int_irq_thread_fn()
82 	case -ENOMEM:  in nfcmrvl_i2c_int_irq_thread_fn()
83 	case -EBADMSG:  in nfcmrvl_i2c_int_irq_thread_fn()
84 		nfc_err(&drv_data->i2c->dev, "read failed %d\n", ret);  in nfcmrvl_i2c_int_irq_thread_fn()
87 		if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)  in nfcmrvl_i2c_int_irq_thread_fn()
88 			nfc_err(&drv_data->i2c->dev, "corrupted RX packet\n");  in nfcmrvl_i2c_int_irq_thread_fn()
94 static int nfcmrvl_i2c_nci_open(struct nfcmrvl_private *priv)  in nfcmrvl_i2c_nci_open()
96 	struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data;  in nfcmrvl_i2c_nci_open()
99 		return -ENODEV;  in nfcmrvl_i2c_nci_open()
104 static int nfcmrvl_i2c_nci_close(struct nfcmrvl_private *priv)  in nfcmrvl_i2c_nci_close()
109 static int nfcmrvl_i2c_nci_send(struct nfcmrvl_private *priv,  in nfcmrvl_i2c_nci_send()
112 	struct nfcmrvl_i2c_drv_data *drv_data = priv->drv_data;  in nfcmrvl_i2c_nci_send()
113 	int ret;  in nfcmrvl_i2c_nci_send()
115 	if (test_bit(NFCMRVL_PHY_ERROR, &priv->flags)) {  in nfcmrvl_i2c_nci_send()
117 		return -EREMOTEIO;  in nfcmrvl_i2c_nci_send()
120 	ret = i2c_master_send(drv_data->i2c, skb->data, skb->len);  in nfcmrvl_i2c_nci_send()
123 	if (ret == -EREMOTEIO) {  in nfcmrvl_i2c_nci_send()
124 		nfc_info(drv_data->dev, "chip may sleep, retry\n");  in nfcmrvl_i2c_nci_send()
126 		ret = i2c_master_send(drv_data->i2c, skb->data, skb->len);  in nfcmrvl_i2c_nci_send()
130 		if (ret != skb->len) {  in nfcmrvl_i2c_nci_send()
131 			nfc_err(drv_data->dev,  in nfcmrvl_i2c_nci_send()
133 				ret, skb->len);  in nfcmrvl_i2c_nci_send()
134 			ret = -EREMOTEIO;  in nfcmrvl_i2c_nci_send()
160 static int nfcmrvl_i2c_parse_dt(struct device_node *node,  in nfcmrvl_i2c_parse_dt()
163 	int ret;  in nfcmrvl_i2c_parse_dt()
171 	if (of_find_property(node, "i2c-int-falling", NULL))  in nfcmrvl_i2c_parse_dt()
172 		pdata->irq_polarity = IRQF_TRIGGER_FALLING;  in nfcmrvl_i2c_parse_dt()
174 		pdata->irq_polarity = IRQF_TRIGGER_RISING;  in nfcmrvl_i2c_parse_dt()
179 		return -EINVAL;  in nfcmrvl_i2c_parse_dt()
181 	pdata->irq = ret;  in nfcmrvl_i2c_parse_dt()
186 static int nfcmrvl_i2c_probe(struct i2c_client *client,  in nfcmrvl_i2c_probe()
192 	int ret;  in nfcmrvl_i2c_probe()
194 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in nfcmrvl_i2c_probe()
195 		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");  in nfcmrvl_i2c_probe()
196 		return -ENODEV;  in nfcmrvl_i2c_probe()
199 	drv_data = devm_kzalloc(&client->dev, sizeof(*drv_data), GFP_KERNEL);  in nfcmrvl_i2c_probe()
201 		return -ENOMEM;  in nfcmrvl_i2c_probe()
203 	drv_data->i2c = client;  in nfcmrvl_i2c_probe()
204 	drv_data->dev = &client->dev;  in nfcmrvl_i2c_probe()
205 	drv_data->priv = NULL;  in nfcmrvl_i2c_probe()
209 	pdata = client->dev.platform_data;  in nfcmrvl_i2c_probe()
211 	if (!pdata && client->dev.of_node)  in nfcmrvl_i2c_probe()
212 		if (nfcmrvl_i2c_parse_dt(client->dev.of_node, &config) == 0)  in nfcmrvl_i2c_probe()
216 		return -EINVAL;  in nfcmrvl_i2c_probe()
219 	ret = devm_request_threaded_irq(&drv_data->i2c->dev, pdata->irq,  in nfcmrvl_i2c_probe()
221 					pdata->irq_polarity | IRQF_ONESHOT,  in nfcmrvl_i2c_probe()
224 		nfc_err(&drv_data->i2c->dev,  in nfcmrvl_i2c_probe()
229 	drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_I2C,  in nfcmrvl_i2c_probe()
231 						  &drv_data->i2c->dev, pdata);  in nfcmrvl_i2c_probe()
233 	if (IS_ERR(drv_data->priv))  in nfcmrvl_i2c_probe()
234 		return PTR_ERR(drv_data->priv);  in nfcmrvl_i2c_probe()
236 	drv_data->priv->support_fw_dnld = true;  in nfcmrvl_i2c_probe()
245 	nfcmrvl_nci_unregister_dev(drv_data->priv);  in nfcmrvl_i2c_remove()
250 	{ .compatible = "marvell,nfc-i2c", },
259 MODULE_DEVICE_TABLE(i2c, nfcmrvl_i2c_id_table);
274 MODULE_DESCRIPTION("Marvell NFC-over-I2C driver");