diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-04 10:58:25 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-04 10:58:25 -0400 |
commit | 1046a2c428bedd64c960dcfd0c57cc69a82fea2f (patch) | |
tree | d34b83e0ac61b51305cece031f7ff49579e3fe76 /drivers/staging/media/go7007/go7007-i2c.c | |
parent | 46e85f5f1c2a1d106c1ec0fa2a06280276b8e052 (diff) | |
parent | b3f4e1eba45eda5d1213810ef3bc53e5247df2df (diff) |
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (144 commits)
[media] saa7134.h: Suppress compiler warnings when CONFIG_VIDEO_SAA7134_RC is not set
[media] it913x [VER 1.07] Support for single ITE 9135 devices
[media] Support for Terratec G1
[media] cx25821: off by one in cx25821_vidioc_s_input()
[media] media: tea5764: reconcile Kconfig symbol and macro
[media] omap_vout: Add poll() support
[media] omap3isp: preview: Add crop support on the sink pad
[media] omap3isp: preview: Rename min/max input/output sizes defines
[media] omap3isp: preview: Remove horizontal averager support
[media] omap3isp: Report the ISP revision through the media controller API
[media] omap3isp: ccdc: remove redundant operation
[media] omap3isp: Fix memory leaks in initialization error paths
[media] omap3isp: Add missing mutex_destroy() calls
[media] omap3isp: Move *_init_entities() functions to the init/cleanup section
[media] omap3isp: Move media_entity_cleanup() from unregister() to cleanup()
[media] MFC: Change MFC firmware binary name
[media] vb2: add vb2_get_unmapped_area in vb2 core
[media] v4l: Add v4l2 subdev driver for S5K6AAFX sensor
[media] v4l: Add AUTO option for the V4L2_CID_POWER_LINE_FREQUENCY control
[media] media: ov6650: stylistic improvements
...
Diffstat (limited to 'drivers/staging/media/go7007/go7007-i2c.c')
-rw-r--r-- | drivers/staging/media/go7007/go7007-i2c.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/staging/media/go7007/go7007-i2c.c b/drivers/staging/media/go7007/go7007-i2c.c new file mode 100644 index 00000000000..b8cfa1a6eae --- /dev/null +++ b/drivers/staging/media/go7007/go7007-i2c.c | |||
@@ -0,0 +1,225 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2005-2006 Micronas USA Inc. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License (Version 2) as | ||
6 | * 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 Foundation, | ||
15 | * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | ||
16 | */ | ||
17 | |||
18 | #include <linux/module.h> | ||
19 | #include <linux/init.h> | ||
20 | #include <linux/delay.h> | ||
21 | #include <linux/sched.h> | ||
22 | #include <linux/list.h> | ||
23 | #include <linux/unistd.h> | ||
24 | #include <linux/time.h> | ||
25 | #include <linux/device.h> | ||
26 | #include <linux/i2c.h> | ||
27 | #include <linux/mutex.h> | ||
28 | #include <linux/uaccess.h> | ||
29 | #include <asm/system.h> | ||
30 | |||
31 | #include "go7007-priv.h" | ||
32 | #include "wis-i2c.h" | ||
33 | |||
34 | /********************* Driver for on-board I2C adapter *********************/ | ||
35 | |||
36 | /* #define GO7007_I2C_DEBUG */ | ||
37 | |||
38 | #define SPI_I2C_ADDR_BASE 0x1400 | ||
39 | #define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2) | ||
40 | #define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6) | ||
41 | #define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7) | ||
42 | #define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8) | ||
43 | #define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9) | ||
44 | #define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa) | ||
45 | |||
46 | #define I2C_STATE_MASK 0x0007 | ||
47 | #define I2C_READ_READY_MASK 0x0008 | ||
48 | |||
49 | /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs | ||
50 | * on the Adlink PCI-MPG24, so access is shared between all of them. */ | ||
51 | static DEFINE_MUTEX(adlink_mpg24_i2c_lock); | ||
52 | |||
53 | static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read, | ||
54 | u16 command, int flags, u8 *data) | ||
55 | { | ||
56 | int i, ret = -1; | ||
57 | u16 val; | ||
58 | |||
59 | if (go->status == STATUS_SHUTDOWN) | ||
60 | return -1; | ||
61 | |||
62 | #ifdef GO7007_I2C_DEBUG | ||
63 | if (read) | ||
64 | printk(KERN_DEBUG "go7007-i2c: reading 0x%02x on 0x%02x\n", | ||
65 | command, addr); | ||
66 | else | ||
67 | printk(KERN_DEBUG | ||
68 | "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n", | ||
69 | *data, command, addr); | ||
70 | #endif | ||
71 | |||
72 | mutex_lock(&go->hw_lock); | ||
73 | |||
74 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | ||
75 | /* Bridge the I2C port on this GO7007 to the shared bus */ | ||
76 | mutex_lock(&adlink_mpg24_i2c_lock); | ||
77 | go7007_write_addr(go, 0x3c82, 0x0020); | ||
78 | } | ||
79 | |||
80 | /* Wait for I2C adapter to be ready */ | ||
81 | for (i = 0; i < 10; ++i) { | ||
82 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | ||
83 | goto i2c_done; | ||
84 | if (!(val & I2C_STATE_MASK)) | ||
85 | break; | ||
86 | msleep(100); | ||
87 | } | ||
88 | if (i == 10) { | ||
89 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); | ||
90 | goto i2c_done; | ||
91 | } | ||
92 | |||
93 | /* Set target register (command) */ | ||
94 | go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags); | ||
95 | go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command); | ||
96 | |||
97 | /* If we're writing, send the data and target address and we're done */ | ||
98 | if (!read) { | ||
99 | go7007_write_addr(go, I2C_DATA_REG_ADDR, *data); | ||
100 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | ||
101 | (addr << 9) | (command >> 8)); | ||
102 | ret = 0; | ||
103 | goto i2c_done; | ||
104 | } | ||
105 | |||
106 | /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */ | ||
107 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | ||
108 | goto i2c_done; | ||
109 | |||
110 | /* Send the target address plus read flag */ | ||
111 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | ||
112 | (addr << 9) | 0x0100 | (command >> 8)); | ||
113 | |||
114 | /* Wait for i2c_rx_data_rdy */ | ||
115 | for (i = 0; i < 10; ++i) { | ||
116 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | ||
117 | goto i2c_done; | ||
118 | if (val & I2C_READ_READY_MASK) | ||
119 | break; | ||
120 | msleep(100); | ||
121 | } | ||
122 | if (i == 10) { | ||
123 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); | ||
124 | goto i2c_done; | ||
125 | } | ||
126 | |||
127 | /* Retrieve the read byte */ | ||
128 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | ||
129 | goto i2c_done; | ||
130 | *data = val; | ||
131 | ret = 0; | ||
132 | |||
133 | i2c_done: | ||
134 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | ||
135 | /* Isolate the I2C port on this GO7007 from the shared bus */ | ||
136 | go7007_write_addr(go, 0x3c82, 0x0000); | ||
137 | mutex_unlock(&adlink_mpg24_i2c_lock); | ||
138 | } | ||
139 | mutex_unlock(&go->hw_lock); | ||
140 | return ret; | ||
141 | } | ||
142 | |||
143 | static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr, | ||
144 | unsigned short flags, char read_write, | ||
145 | u8 command, int size, union i2c_smbus_data *data) | ||
146 | { | ||
147 | struct go7007 *go = i2c_get_adapdata(adapter); | ||
148 | |||
149 | if (size != I2C_SMBUS_BYTE_DATA) | ||
150 | return -1; | ||
151 | return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command, | ||
152 | flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte); | ||
153 | } | ||
154 | |||
155 | /* VERY LIMITED I2C master xfer function -- only needed because the | ||
156 | * SMBus functions only support 8-bit commands and the SAA7135 uses | ||
157 | * 16-bit commands. The I2C interface on the GO7007, as limited as | ||
158 | * it is, does support this mode. */ | ||
159 | |||
160 | static int go7007_i2c_master_xfer(struct i2c_adapter *adapter, | ||
161 | struct i2c_msg msgs[], int num) | ||
162 | { | ||
163 | struct go7007 *go = i2c_get_adapdata(adapter); | ||
164 | int i; | ||
165 | |||
166 | for (i = 0; i < num; ++i) { | ||
167 | /* We can only do two things here -- write three bytes, or | ||
168 | * write two bytes and read one byte. */ | ||
169 | if (msgs[i].len == 2) { | ||
170 | if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr || | ||
171 | (msgs[i].flags & I2C_M_RD) || | ||
172 | !(msgs[i + 1].flags & I2C_M_RD) || | ||
173 | msgs[i + 1].len != 1) | ||
174 | return -1; | ||
175 | if (go7007_i2c_xfer(go, msgs[i].addr, 1, | ||
176 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | ||
177 | 0x01, &msgs[i + 1].buf[0]) < 0) | ||
178 | return -1; | ||
179 | ++i; | ||
180 | } else if (msgs[i].len == 3) { | ||
181 | if (msgs[i].flags & I2C_M_RD) | ||
182 | return -1; | ||
183 | if (msgs[i].len != 3) | ||
184 | return -1; | ||
185 | if (go7007_i2c_xfer(go, msgs[i].addr, 0, | ||
186 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | ||
187 | 0x01, &msgs[i].buf[2]) < 0) | ||
188 | return -1; | ||
189 | } else | ||
190 | return -1; | ||
191 | } | ||
192 | |||
193 | return 0; | ||
194 | } | ||
195 | |||
196 | static u32 go7007_functionality(struct i2c_adapter *adapter) | ||
197 | { | ||
198 | return I2C_FUNC_SMBUS_BYTE_DATA; | ||
199 | } | ||
200 | |||
201 | static struct i2c_algorithm go7007_algo = { | ||
202 | .smbus_xfer = go7007_smbus_xfer, | ||
203 | .master_xfer = go7007_i2c_master_xfer, | ||
204 | .functionality = go7007_functionality, | ||
205 | }; | ||
206 | |||
207 | static struct i2c_adapter go7007_adap_templ = { | ||
208 | .owner = THIS_MODULE, | ||
209 | .name = "WIS GO7007SB", | ||
210 | .algo = &go7007_algo, | ||
211 | }; | ||
212 | |||
213 | int go7007_i2c_init(struct go7007 *go) | ||
214 | { | ||
215 | memcpy(&go->i2c_adapter, &go7007_adap_templ, | ||
216 | sizeof(go7007_adap_templ)); | ||
217 | go->i2c_adapter.dev.parent = go->dev; | ||
218 | i2c_set_adapdata(&go->i2c_adapter, go); | ||
219 | if (i2c_add_adapter(&go->i2c_adapter) < 0) { | ||
220 | printk(KERN_ERR | ||
221 | "go7007-i2c: error: i2c_add_adapter failed\n"); | ||
222 | return -1; | ||
223 | } | ||
224 | return 0; | ||
225 | } | ||