1/*
  2 * NCI based driver for Samsung S3FWRN5 NFC chip
  3 *
  4 * Copyright (C) 2015 Samsung Electrnoics
  5 * Robert Baldyga <r.baldyga@samsung.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify it
  8 * under the terms and conditions of the GNU General Public License,
  9 * version 2 or later, as published by the Free Software Foundation.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 18 */
 19
 20#include <linux/completion.h>
 21#include <linux/firmware.h>
 22
 23#include "s3fwrn5.h"
 24#include "nci.h"
 25
 26static int s3fwrn5_nci_prop_rsp(struct nci_dev *ndev, struct sk_buff *skb)
 27{
 28	__u8 status = skb->data[0];
 29
 30	nci_req_complete(ndev, status);
 31	return 0;
 32}
 33
 34static struct nci_driver_ops s3fwrn5_nci_prop_ops[] = {
 35	{
 36		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 37				NCI_PROP_AGAIN),
 38		.rsp = s3fwrn5_nci_prop_rsp,
 39	},
 40	{
 41		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 42				NCI_PROP_GET_RFREG),
 43		.rsp = s3fwrn5_nci_prop_rsp,
 44	},
 45	{
 46		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 47				NCI_PROP_SET_RFREG),
 48		.rsp = s3fwrn5_nci_prop_rsp,
 49	},
 50	{
 51		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 52				NCI_PROP_GET_RFREG_VER),
 53		.rsp = s3fwrn5_nci_prop_rsp,
 54	},
 55	{
 56		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 57				NCI_PROP_SET_RFREG_VER),
 58		.rsp = s3fwrn5_nci_prop_rsp,
 59	},
 60	{
 61		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 62				NCI_PROP_START_RFREG),
 63		.rsp = s3fwrn5_nci_prop_rsp,
 64	},
 65	{
 66		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 67				NCI_PROP_STOP_RFREG),
 68		.rsp = s3fwrn5_nci_prop_rsp,
 69	},
 70	{
 71		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 72				NCI_PROP_FW_CFG),
 73		.rsp = s3fwrn5_nci_prop_rsp,
 74	},
 75	{
 76		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 77				NCI_PROP_WR_RESET),
 78		.rsp = s3fwrn5_nci_prop_rsp,
 79	},
 80};
 81
 82void s3fwrn5_nci_get_prop_ops(struct nci_driver_ops **ops, size_t *n)
 83{
 84	*ops = s3fwrn5_nci_prop_ops;
 85	*n = ARRAY_SIZE(s3fwrn5_nci_prop_ops);
 86}
 87
 88#define S3FWRN5_RFREG_SECTION_SIZE 252
 89
 90int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
 91{
 92	const struct firmware *fw;
 93	struct nci_prop_fw_cfg_cmd fw_cfg;
 94	struct nci_prop_set_rfreg_cmd set_rfreg;
 95	struct nci_prop_stop_rfreg_cmd stop_rfreg;
 96	u32 checksum;
 97	int i, len;
 98	int ret;
 99
100	ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
101	if (ret < 0)
102		return ret;
103
104	/* Compute rfreg checksum */
105
106	checksum = 0;
107	for (i = 0; i < fw->size; i += 4)
108		checksum += *((u32 *)(fw->data+i));
109
110	/* Set default clock configuration for external crystal */
111
112	fw_cfg.clk_type = 0x01;
113	fw_cfg.clk_speed = 0xff;
114	fw_cfg.clk_req = 0xff;
115	ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
116		sizeof(fw_cfg), (__u8 *)&fw_cfg);
117	if (ret < 0)
118		goto out;
119
120	/* Start rfreg configuration */
121
122	dev_info(&info->ndev->nfc_dev->dev,
123		"rfreg configuration update: %s\n", fw_name);
124
125	ret = nci_prop_cmd(info->ndev, NCI_PROP_START_RFREG, 0, NULL);
126	if (ret < 0) {
127		dev_err(&info->ndev->nfc_dev->dev,
128			"Unable to start rfreg update\n");
129		goto out;
130	}
131
132	/* Update rfreg */
133
134	set_rfreg.index = 0;
135	for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
136		len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
137			(fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
138		memcpy(set_rfreg.data, fw->data+i, len);
139		ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
140			len+1, (__u8 *)&set_rfreg);
141		if (ret < 0) {
142			dev_err(&info->ndev->nfc_dev->dev,
143				"rfreg update error (code=%d)\n", ret);
144			goto out;
145		}
146		set_rfreg.index++;
147	}
148
149	/* Finish rfreg configuration */
150
151	stop_rfreg.checksum = checksum & 0xffff;
152	ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
153		sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
154	if (ret < 0) {
155		dev_err(&info->ndev->nfc_dev->dev,
156			"Unable to stop rfreg update\n");
157		goto out;
158	}
159
160	dev_info(&info->ndev->nfc_dev->dev,
161		"rfreg configuration update: success\n");
162out:
163	release_firmware(fw);
164	return ret;
165}