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a49d2536 AC |
1 | /* |
2 | * Copyright (c) 2013 Intel Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License version | |
6 | * 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA. | |
17 | * | |
18 | */ | |
19 | #include <linux/bitops.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/types.h> | |
32 | #include <media/v4l2-device.h> | |
a49d2536 AC |
33 | #include "common.h" |
34 | ||
35 | /* Defines for OTP Data Registers */ | |
36 | #define IMX_OTP_START_ADDR 0x3B04 | |
37 | #define IMX_OTP_PAGE_SIZE 64 | |
38 | #define IMX_OTP_READY_REG 0x3B01 | |
39 | #define IMX_OTP_PAGE_REG 0x3B02 | |
40 | #define IMX_OTP_MODE_REG 0x3B00 | |
41 | #define IMX_OTP_PAGE_MAX 20 | |
42 | #define IMX_OTP_READY_REG_DONE 1 | |
43 | #define IMX_OTP_READ_ONETIME 32 | |
44 | #define IMX_OTP_MODE_READ 1 | |
45 | #define IMX227_OTP_START_ADDR 0x0A04 | |
46 | #define IMX227_OTP_ENABLE_REG 0x0A00 | |
47 | #define IMX227_OTP_READY_REG 0x0A01 | |
48 | #define IMX227_OTP_PAGE_REG 0x0A02 | |
49 | #define IMX227_OTP_READY_REG_DONE 1 | |
50 | #define IMX227_OTP_MODE_READ 1 | |
51 | ||
52 | static int | |
53 | imx_read_otp_data(struct i2c_client *client, u16 len, u16 reg, void *val) | |
54 | { | |
55 | struct i2c_msg msg[2]; | |
56 | u16 data[IMX_SHORT_MAX] = { 0 }; | |
57 | int err; | |
58 | ||
59 | if (len > IMX_BYTE_MAX) { | |
60 | dev_err(&client->dev, "%s error, invalid data length\n", | |
61 | __func__); | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | memset(msg, 0 , sizeof(msg)); | |
66 | memset(data, 0 , sizeof(data)); | |
67 | ||
68 | msg[0].addr = client->addr; | |
69 | msg[0].flags = 0; | |
70 | msg[0].len = I2C_MSG_LENGTH; | |
71 | msg[0].buf = (u8 *)data; | |
72 | /* high byte goes first */ | |
73 | data[0] = cpu_to_be16(reg); | |
74 | ||
75 | msg[1].addr = client->addr; | |
76 | msg[1].len = len; | |
77 | msg[1].flags = I2C_M_RD; | |
78 | msg[1].buf = (u8 *)data; | |
79 | ||
80 | err = i2c_transfer(client->adapter, msg, 2); | |
81 | if (err != 2) { | |
82 | if (err >= 0) | |
83 | err = -EIO; | |
84 | goto error; | |
85 | } | |
86 | ||
87 | memcpy(val, data, len); | |
88 | return 0; | |
89 | ||
90 | error: | |
91 | dev_err(&client->dev, "read from offset 0x%x error %d", reg, err); | |
92 | return err; | |
93 | } | |
94 | ||
95 | static int imx_read_otp_reg_array(struct i2c_client *client, u16 size, u16 addr, | |
96 | u8 *buf) | |
97 | { | |
98 | u16 index; | |
99 | int ret; | |
100 | ||
101 | for (index = 0; index + IMX_OTP_READ_ONETIME <= size; | |
102 | index += IMX_OTP_READ_ONETIME) { | |
103 | ret = imx_read_otp_data(client, IMX_OTP_READ_ONETIME, | |
104 | addr + index, &buf[index]); | |
105 | if (ret) | |
106 | return ret; | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | ||
111 | void *imx_otp_read(struct v4l2_subdev *sd, u8 dev_addr, | |
112 | u32 start_addr, u32 size) | |
113 | { | |
114 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
115 | u8 *buf; | |
116 | int ret; | |
117 | int i; | |
118 | ||
119 | buf = devm_kzalloc(&client->dev, size, GFP_KERNEL); | |
120 | if (!buf) | |
121 | return ERR_PTR(-ENOMEM); | |
122 | ||
123 | for (i = 0; i < IMX_OTP_PAGE_MAX; i++) { | |
124 | ||
125 | /*set page NO.*/ | |
126 | ret = imx_write_reg(client, IMX_8BIT, | |
127 | IMX_OTP_PAGE_REG, i & 0xff); | |
128 | if (ret) | |
129 | goto fail; | |
130 | ||
131 | /*set read mode*/ | |
132 | ret = imx_write_reg(client, IMX_8BIT, | |
133 | IMX_OTP_MODE_REG, IMX_OTP_MODE_READ); | |
134 | if (ret) | |
135 | goto fail; | |
136 | ||
137 | /* Reading the OTP data array */ | |
138 | ret = imx_read_otp_reg_array(client, IMX_OTP_PAGE_SIZE, | |
139 | IMX_OTP_START_ADDR, buf + i * IMX_OTP_PAGE_SIZE); | |
140 | if (ret) | |
141 | goto fail; | |
142 | } | |
143 | ||
144 | return buf; | |
145 | fail: | |
146 | /* Driver has failed to find valid data */ | |
147 | dev_err(&client->dev, "sensor found no valid OTP data\n"); | |
148 | return ERR_PTR(ret); | |
149 | } | |
150 | ||
151 | void *imx227_otp_read(struct v4l2_subdev *sd, u8 dev_addr, | |
152 | u32 start_addr, u32 size) | |
153 | { | |
154 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
155 | u8 *buf; | |
156 | int ret; | |
157 | int i; | |
158 | ||
159 | buf = devm_kzalloc(&client->dev, size, GFP_KERNEL); | |
160 | if (!buf) | |
161 | return ERR_PTR(-ENOMEM); | |
162 | ||
163 | for (i = 0; i < IMX_OTP_PAGE_MAX; i++) { | |
164 | ||
165 | /*set page NO.*/ | |
166 | ret = imx_write_reg(client, IMX_8BIT, | |
167 | IMX227_OTP_PAGE_REG, i & 0xff); | |
168 | if (ret) | |
169 | goto fail; | |
170 | ||
171 | /*set read mode*/ | |
172 | ret = imx_write_reg(client, IMX_8BIT, | |
173 | IMX227_OTP_ENABLE_REG, IMX227_OTP_MODE_READ); | |
174 | if (ret) | |
175 | goto fail; | |
176 | ||
177 | /* Reading the OTP data array */ | |
178 | ret = imx_read_otp_reg_array(client, IMX_OTP_PAGE_SIZE, | |
179 | IMX227_OTP_START_ADDR, buf + i * IMX_OTP_PAGE_SIZE); | |
180 | if (ret) | |
181 | goto fail; | |
182 | } | |
183 | ||
184 | return buf; | |
185 | fail: | |
186 | /* Driver has failed to find valid data */ | |
187 | dev_err(&client->dev, "sensor found no valid OTP data\n"); | |
188 | return ERR_PTR(ret); | |
189 | } | |
190 |