Commit | Line | Data |
---|---|---|
ccfc97bd | 1 | /* |
cb7a01ac | 2 | * drivers/media/i2c/smiapp/smiapp-regs.c |
ccfc97bd SA |
3 | * |
4 | * Generic driver for SMIA/SMIA++ compliant camera modules | |
5 | * | |
6 | * Copyright (C) 2011--2012 Nokia Corporation | |
8c5dff90 | 7 | * Contact: Sakari Ailus <sakari.ailus@iki.fi> |
ccfc97bd SA |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
ccfc97bd SA |
17 | */ |
18 | ||
ccfc97bd SA |
19 | #include <linux/delay.h> |
20 | #include <linux/i2c.h> | |
21 | ||
1e73eea7 | 22 | #include "smiapp.h" |
ccfc97bd SA |
23 | #include "smiapp-regs.h" |
24 | ||
25 | static uint32_t float_to_u32_mul_1000000(struct i2c_client *client, | |
26 | uint32_t phloat) | |
27 | { | |
28 | int32_t exp; | |
29 | uint64_t man; | |
30 | ||
31 | if (phloat >= 0x80000000) { | |
32 | dev_err(&client->dev, "this is a negative number\n"); | |
33 | return 0; | |
34 | } | |
35 | ||
36 | if (phloat == 0x7f800000) | |
37 | return ~0; /* Inf. */ | |
38 | ||
39 | if ((phloat & 0x7f800000) == 0x7f800000) { | |
40 | dev_err(&client->dev, "NaN or other special number\n"); | |
41 | return 0; | |
42 | } | |
43 | ||
44 | /* Valid cases begin here */ | |
45 | if (phloat == 0) | |
46 | return 0; /* Valid zero */ | |
47 | ||
48 | if (phloat > 0x4f800000) | |
49 | return ~0; /* larger than 4294967295 */ | |
50 | ||
51 | /* | |
52 | * Unbias exponent (note how phloat is now guaranteed to | |
53 | * have 0 in the high bit) | |
54 | */ | |
55 | exp = ((int32_t)phloat >> 23) - 127; | |
56 | ||
57 | /* Extract mantissa, add missing '1' bit and it's in MHz */ | |
58 | man = ((phloat & 0x7fffff) | 0x800000) * 1000000ULL; | |
59 | ||
60 | if (exp < 0) | |
61 | man >>= -exp; | |
62 | else | |
63 | man <<= exp; | |
64 | ||
65 | man >>= 23; /* Remove mantissa bias */ | |
66 | ||
67 | return man & 0xffffffff; | |
68 | } | |
69 | ||
70 | ||
71 | /* | |
72 | * Read a 8/16/32-bit i2c register. The value is returned in 'val'. | |
73 | * Returns zero if successful, or non-zero otherwise. | |
74 | */ | |
ceb9e30e SA |
75 | static int ____smiapp_read(struct smiapp_sensor *sensor, u16 reg, |
76 | u16 len, u32 *val) | |
ccfc97bd | 77 | { |
1e73eea7 | 78 | struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); |
ccfc97bd SA |
79 | struct i2c_msg msg; |
80 | unsigned char data[4]; | |
ccfc97bd SA |
81 | u16 offset = reg; |
82 | int r; | |
83 | ||
ccfc97bd SA |
84 | msg.addr = client->addr; |
85 | msg.flags = 0; | |
86 | msg.len = 2; | |
87 | msg.buf = data; | |
88 | ||
89 | /* high byte goes out first */ | |
90 | data[0] = (u8) (offset >> 8); | |
91 | data[1] = (u8) offset; | |
92 | r = i2c_transfer(client->adapter, &msg, 1); | |
93 | if (r != 1) { | |
94 | if (r >= 0) | |
95 | r = -EBUSY; | |
96 | goto err; | |
97 | } | |
98 | ||
99 | msg.len = len; | |
100 | msg.flags = I2C_M_RD; | |
101 | r = i2c_transfer(client->adapter, &msg, 1); | |
102 | if (r != 1) { | |
103 | if (r >= 0) | |
104 | r = -EBUSY; | |
105 | goto err; | |
106 | } | |
107 | ||
108 | *val = 0; | |
109 | /* high byte comes first */ | |
110 | switch (len) { | |
6fcc7a52 | 111 | case SMIAPP_REG_32BIT: |
ccfc97bd SA |
112 | *val = (data[0] << 24) + (data[1] << 16) + (data[2] << 8) + |
113 | data[3]; | |
114 | break; | |
6fcc7a52 | 115 | case SMIAPP_REG_16BIT: |
ccfc97bd SA |
116 | *val = (data[0] << 8) + data[1]; |
117 | break; | |
6fcc7a52 | 118 | case SMIAPP_REG_8BIT: |
ccfc97bd SA |
119 | *val = data[0]; |
120 | break; | |
121 | default: | |
122 | BUG(); | |
123 | } | |
124 | ||
ccfc97bd SA |
125 | return 0; |
126 | ||
127 | err: | |
128 | dev_err(&client->dev, "read from offset 0x%x error %d\n", offset, r); | |
129 | ||
130 | return r; | |
131 | } | |
132 | ||
ceb9e30e SA |
133 | /* Read a register using 8-bit access only. */ |
134 | static int ____smiapp_read_8only(struct smiapp_sensor *sensor, u16 reg, | |
135 | u16 len, u32 *val) | |
136 | { | |
137 | unsigned int i; | |
138 | int rval; | |
139 | ||
140 | *val = 0; | |
141 | ||
142 | for (i = 0; i < len; i++) { | |
143 | u32 val8; | |
144 | ||
145 | rval = ____smiapp_read(sensor, reg + i, 1, &val8); | |
146 | if (rval < 0) | |
147 | return rval; | |
148 | *val |= val8 << ((len - i - 1) << 3); | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Read a 8/16/32-bit i2c register. The value is returned in 'val'. | |
156 | * Returns zero if successful, or non-zero otherwise. | |
157 | */ | |
158 | static int __smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val, | |
159 | bool only8) | |
160 | { | |
161 | struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); | |
f5d65070 | 162 | u8 len = SMIAPP_REG_WIDTH(reg); |
ceb9e30e SA |
163 | int rval; |
164 | ||
6fcc7a52 SA |
165 | if (len != SMIAPP_REG_8BIT && len != SMIAPP_REG_16BIT |
166 | && len != SMIAPP_REG_32BIT) | |
ceb9e30e SA |
167 | return -EINVAL; |
168 | ||
b05cd219 | 169 | if (len == SMIAPP_REG_8BIT || !only8) |
f5d65070 | 170 | rval = ____smiapp_read(sensor, SMIAPP_REG_ADDR(reg), len, val); |
ceb9e30e | 171 | else |
f5d65070 SA |
172 | rval = ____smiapp_read_8only(sensor, SMIAPP_REG_ADDR(reg), len, |
173 | val); | |
ceb9e30e SA |
174 | if (rval < 0) |
175 | return rval; | |
176 | ||
6fcc7a52 | 177 | if (reg & SMIAPP_REG_FLAG_FLOAT) |
ceb9e30e SA |
178 | *val = float_to_u32_mul_1000000(client, *val); |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
6f7481b6 | 183 | int smiapp_read_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 *val) |
ceb9e30e SA |
184 | { |
185 | return __smiapp_read( | |
186 | sensor, reg, val, | |
187 | smiapp_needs_quirk(sensor, | |
188 | SMIAPP_QUIRK_FLAG_8BIT_READ_ONLY)); | |
189 | } | |
190 | ||
6f7481b6 SA |
191 | int smiapp_read(struct smiapp_sensor *sensor, u32 reg, u32 *val) |
192 | { | |
193 | int rval; | |
194 | ||
195 | *val = 0; | |
196 | rval = smiapp_call_quirk(sensor, reg_access, false, ®, val); | |
197 | if (rval == -ENOIOCTLCMD) | |
198 | return 0; | |
199 | if (rval < 0) | |
200 | return rval; | |
201 | ||
202 | return smiapp_read_no_quirk(sensor, reg, val); | |
203 | } | |
204 | ||
ceb9e30e SA |
205 | int smiapp_read_8only(struct smiapp_sensor *sensor, u32 reg, u32 *val) |
206 | { | |
6f7481b6 SA |
207 | int rval; |
208 | ||
209 | *val = 0; | |
210 | rval = smiapp_call_quirk(sensor, reg_access, false, ®, val); | |
211 | if (rval == -ENOIOCTLCMD) | |
212 | return 0; | |
213 | if (rval < 0) | |
214 | return rval; | |
215 | ||
ceb9e30e SA |
216 | return __smiapp_read(sensor, reg, val, true); |
217 | } | |
218 | ||
6f7481b6 | 219 | int smiapp_write_no_quirk(struct smiapp_sensor *sensor, u32 reg, u32 val) |
ccfc97bd | 220 | { |
1e73eea7 | 221 | struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); |
ccfc97bd SA |
222 | struct i2c_msg msg; |
223 | unsigned char data[6]; | |
224 | unsigned int retries; | |
f5d65070 SA |
225 | u8 flags = SMIAPP_REG_FLAGS(reg); |
226 | u8 len = SMIAPP_REG_WIDTH(reg); | |
227 | u16 offset = SMIAPP_REG_ADDR(reg); | |
ccfc97bd SA |
228 | int r; |
229 | ||
6fcc7a52 SA |
230 | if ((len != SMIAPP_REG_8BIT && len != SMIAPP_REG_16BIT && |
231 | len != SMIAPP_REG_32BIT) || flags) | |
ccfc97bd SA |
232 | return -EINVAL; |
233 | ||
234 | msg.addr = client->addr; | |
235 | msg.flags = 0; /* Write */ | |
236 | msg.len = 2 + len; | |
237 | msg.buf = data; | |
238 | ||
239 | /* high byte goes out first */ | |
240 | data[0] = (u8) (reg >> 8); | |
241 | data[1] = (u8) (reg & 0xff); | |
242 | ||
243 | switch (len) { | |
6fcc7a52 | 244 | case SMIAPP_REG_8BIT: |
ccfc97bd SA |
245 | data[2] = val; |
246 | break; | |
6fcc7a52 | 247 | case SMIAPP_REG_16BIT: |
ccfc97bd SA |
248 | data[2] = val >> 8; |
249 | data[3] = val; | |
250 | break; | |
6fcc7a52 | 251 | case SMIAPP_REG_32BIT: |
ccfc97bd SA |
252 | data[2] = val >> 24; |
253 | data[3] = val >> 16; | |
254 | data[4] = val >> 8; | |
255 | data[5] = val; | |
256 | break; | |
257 | default: | |
258 | BUG(); | |
259 | } | |
260 | ||
261 | for (retries = 0; retries < 5; retries++) { | |
262 | /* | |
263 | * Due to unknown reason sensor stops responding. This | |
264 | * loop is a temporaty solution until the root cause | |
265 | * is found. | |
266 | */ | |
267 | r = i2c_transfer(client->adapter, &msg, 1); | |
268 | if (r == 1) { | |
269 | if (retries) | |
270 | dev_err(&client->dev, | |
271 | "sensor i2c stall encountered. " | |
272 | "retries: %d\n", retries); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | usleep_range(2000, 2000); | |
277 | } | |
278 | ||
279 | dev_err(&client->dev, | |
280 | "wrote 0x%x to offset 0x%x error %d\n", val, offset, r); | |
281 | ||
282 | return r; | |
283 | } | |
6f7481b6 SA |
284 | |
285 | /* | |
286 | * Write to a 8/16-bit register. | |
287 | * Returns zero if successful, or non-zero otherwise. | |
288 | */ | |
289 | int smiapp_write(struct smiapp_sensor *sensor, u32 reg, u32 val) | |
290 | { | |
291 | int rval; | |
292 | ||
293 | rval = smiapp_call_quirk(sensor, reg_access, true, ®, &val); | |
294 | if (rval == -ENOIOCTLCMD) | |
295 | return 0; | |
296 | if (rval < 0) | |
297 | return rval; | |
298 | ||
299 | return smiapp_write_no_quirk(sensor, reg, val); | |
300 | } |