Greg Kroah-Hartman | 866b869 | 2008-02-15 16:53:09 -0800 | [diff] [blame] | 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 | |
Greg Kroah-Hartman | 866b869 | 2008-02-15 16:53:09 -0800 | [diff] [blame] | 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/semaphore.h> |
| 28 | #include <linux/uaccess.h> |
| 29 | #include <asm/system.h> |
| 30 | |
| 31 | #include "go7007-priv.h" |
| 32 | #include "wis-i2c.h" |
| 33 | |
| 34 | /************** Registration interface for I2C client drivers **************/ |
| 35 | |
| 36 | /* Since there's no way to auto-probe the I2C devices connected to the I2C |
| 37 | * bus on the go7007, we have this silly little registration system that |
| 38 | * client drivers can use to register their I2C driver ID and their |
| 39 | * detect_client function (the one that's normally passed to i2c_probe). |
| 40 | * |
| 41 | * When a new go7007 device is connected, we can look up in a board info |
| 42 | * table by the USB or PCI vendor/product/revision ID to determine |
| 43 | * which I2C client module to load. The client driver module will register |
| 44 | * itself here, and then we can call the registered detect_client function |
| 45 | * to force-load a new client at the address listed in the board info table. |
| 46 | * |
| 47 | * Really the I2C subsystem should have a way to force-load I2C client |
| 48 | * drivers when we have a priori knowledge of what's on the bus, especially |
| 49 | * since the existing I2C auto-probe mechanism is so hokey, but we'll use |
| 50 | * our own mechanism for the time being. */ |
| 51 | |
| 52 | struct wis_i2c_client_driver { |
| 53 | unsigned int id; |
| 54 | found_proc found_proc; |
| 55 | struct list_head list; |
| 56 | }; |
| 57 | |
| 58 | static LIST_HEAD(i2c_client_drivers); |
| 59 | static DECLARE_MUTEX(i2c_client_driver_list_lock); |
| 60 | |
| 61 | /* Client drivers register here by their I2C driver ID */ |
| 62 | int wis_i2c_add_driver(unsigned int id, found_proc found_proc) |
| 63 | { |
| 64 | struct wis_i2c_client_driver *driver; |
| 65 | |
| 66 | driver = kmalloc(sizeof(struct wis_i2c_client_driver), GFP_KERNEL); |
| 67 | if (driver == NULL) |
| 68 | return -ENOMEM; |
| 69 | driver->id = id; |
| 70 | driver->found_proc = found_proc; |
| 71 | |
| 72 | down(&i2c_client_driver_list_lock); |
| 73 | list_add_tail(&driver->list, &i2c_client_drivers); |
| 74 | up(&i2c_client_driver_list_lock); |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | EXPORT_SYMBOL(wis_i2c_add_driver); |
| 79 | |
| 80 | void wis_i2c_del_driver(found_proc found_proc) |
| 81 | { |
| 82 | struct wis_i2c_client_driver *driver, *next; |
| 83 | |
| 84 | down(&i2c_client_driver_list_lock); |
| 85 | list_for_each_entry_safe(driver, next, &i2c_client_drivers, list) |
| 86 | if (driver->found_proc == found_proc) { |
| 87 | list_del(&driver->list); |
| 88 | kfree(driver); |
| 89 | } |
| 90 | up(&i2c_client_driver_list_lock); |
| 91 | } |
| 92 | EXPORT_SYMBOL(wis_i2c_del_driver); |
| 93 | |
| 94 | /* The main go7007 driver calls this to instantiate a client by driver |
| 95 | * ID and bus address, which are both stored in the board info table */ |
| 96 | int wis_i2c_probe_device(struct i2c_adapter *adapter, |
| 97 | unsigned int id, int addr) |
| 98 | { |
| 99 | struct wis_i2c_client_driver *driver; |
| 100 | int found = 0; |
| 101 | |
| 102 | if (addr < 0 || addr > 0x7f) |
| 103 | return -1; |
| 104 | down(&i2c_client_driver_list_lock); |
| 105 | list_for_each_entry(driver, &i2c_client_drivers, list) |
| 106 | if (driver->id == id) { |
| 107 | if (driver->found_proc(adapter, addr, 0) == 0) |
| 108 | found = 1; |
| 109 | break; |
| 110 | } |
| 111 | up(&i2c_client_driver_list_lock); |
| 112 | return found; |
| 113 | } |
| 114 | |
| 115 | /********************* Driver for on-board I2C adapter *********************/ |
| 116 | |
| 117 | /* #define GO7007_I2C_DEBUG */ |
| 118 | |
| 119 | #define SPI_I2C_ADDR_BASE 0x1400 |
| 120 | #define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2) |
| 121 | #define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6) |
| 122 | #define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7) |
| 123 | #define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8) |
| 124 | #define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9) |
| 125 | #define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa) |
| 126 | |
| 127 | #define I2C_STATE_MASK 0x0007 |
| 128 | #define I2C_READ_READY_MASK 0x0008 |
| 129 | |
| 130 | /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs |
| 131 | * on the Adlink PCI-MPG24, so access is shared between all of them. */ |
| 132 | static DECLARE_MUTEX(adlink_mpg24_i2c_lock); |
| 133 | |
| 134 | static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read, |
| 135 | u16 command, int flags, u8 *data) |
| 136 | { |
| 137 | int i, ret = -1; |
| 138 | u16 val; |
| 139 | |
| 140 | if (go->status == STATUS_SHUTDOWN) |
| 141 | return -1; |
| 142 | |
| 143 | #ifdef GO7007_I2C_DEBUG |
| 144 | if (read) |
| 145 | printk(KERN_DEBUG "go7007-i2c: reading 0x%02x on 0x%02x\n", |
| 146 | command, addr); |
| 147 | else |
| 148 | printk(KERN_DEBUG |
| 149 | "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n", |
| 150 | *data, command, addr); |
| 151 | #endif |
| 152 | |
| 153 | down(&go->hw_lock); |
| 154 | |
| 155 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { |
| 156 | /* Bridge the I2C port on this GO7007 to the shared bus */ |
| 157 | down(&adlink_mpg24_i2c_lock); |
| 158 | go7007_write_addr(go, 0x3c82, 0x0020); |
| 159 | } |
| 160 | |
| 161 | /* Wait for I2C adapter to be ready */ |
| 162 | for (i = 0; i < 10; ++i) { |
| 163 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) |
| 164 | goto i2c_done; |
| 165 | if (!(val & I2C_STATE_MASK)) |
| 166 | break; |
| 167 | msleep(100); |
| 168 | } |
| 169 | if (i == 10) { |
| 170 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); |
| 171 | goto i2c_done; |
| 172 | } |
| 173 | |
| 174 | /* Set target register (command) */ |
| 175 | go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags); |
| 176 | go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command); |
| 177 | |
| 178 | /* If we're writing, send the data and target address and we're done */ |
| 179 | if (!read) { |
| 180 | go7007_write_addr(go, I2C_DATA_REG_ADDR, *data); |
| 181 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, |
| 182 | (addr << 9) | (command >> 8)); |
| 183 | ret = 0; |
| 184 | goto i2c_done; |
| 185 | } |
| 186 | |
| 187 | /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */ |
| 188 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) |
| 189 | goto i2c_done; |
| 190 | |
| 191 | /* Send the target address plus read flag */ |
| 192 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, |
| 193 | (addr << 9) | 0x0100 | (command >> 8)); |
| 194 | |
| 195 | /* Wait for i2c_rx_data_rdy */ |
| 196 | for (i = 0; i < 10; ++i) { |
| 197 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) |
| 198 | goto i2c_done; |
| 199 | if (val & I2C_READ_READY_MASK) |
| 200 | break; |
| 201 | msleep(100); |
| 202 | } |
| 203 | if (i == 10) { |
| 204 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); |
| 205 | goto i2c_done; |
| 206 | } |
| 207 | |
| 208 | /* Retrieve the read byte */ |
| 209 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) |
| 210 | goto i2c_done; |
| 211 | *data = val; |
| 212 | ret = 0; |
| 213 | |
| 214 | i2c_done: |
| 215 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { |
| 216 | /* Isolate the I2C port on this GO7007 from the shared bus */ |
| 217 | go7007_write_addr(go, 0x3c82, 0x0000); |
| 218 | up(&adlink_mpg24_i2c_lock); |
| 219 | } |
| 220 | up(&go->hw_lock); |
| 221 | return ret; |
| 222 | } |
| 223 | |
| 224 | static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
| 225 | unsigned short flags, char read_write, |
| 226 | u8 command, int size, union i2c_smbus_data *data) |
| 227 | { |
| 228 | struct go7007 *go = i2c_get_adapdata(adapter); |
| 229 | |
| 230 | if (size != I2C_SMBUS_BYTE_DATA) |
| 231 | return -1; |
| 232 | return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command, |
| 233 | flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte); |
| 234 | } |
| 235 | |
| 236 | /* VERY LIMITED I2C master xfer function -- only needed because the |
| 237 | * SMBus functions only support 8-bit commands and the SAA7135 uses |
| 238 | * 16-bit commands. The I2C interface on the GO7007, as limited as |
| 239 | * it is, does support this mode. */ |
| 240 | |
| 241 | static int go7007_i2c_master_xfer(struct i2c_adapter *adapter, |
| 242 | struct i2c_msg msgs[], int num) |
| 243 | { |
| 244 | struct go7007 *go = i2c_get_adapdata(adapter); |
| 245 | int i; |
| 246 | |
| 247 | for (i = 0; i < num; ++i) { |
| 248 | /* We can only do two things here -- write three bytes, or |
| 249 | * write two bytes and read one byte. */ |
| 250 | if (msgs[i].len == 2) { |
| 251 | if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr || |
| 252 | (msgs[i].flags & I2C_M_RD) || |
| 253 | !(msgs[i + 1].flags & I2C_M_RD) || |
| 254 | msgs[i + 1].len != 1) |
| 255 | return -1; |
| 256 | if (go7007_i2c_xfer(go, msgs[i].addr, 1, |
| 257 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], |
| 258 | 0x01, &msgs[i + 1].buf[0]) < 0) |
| 259 | return -1; |
| 260 | ++i; |
| 261 | } else if (msgs[i].len == 3) { |
| 262 | if (msgs[i].flags & I2C_M_RD) |
| 263 | return -1; |
| 264 | if (msgs[i].len != 3) |
| 265 | return -1; |
| 266 | if (go7007_i2c_xfer(go, msgs[i].addr, 0, |
| 267 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], |
| 268 | 0x01, &msgs[i].buf[2]) < 0) |
| 269 | return -1; |
| 270 | } else |
| 271 | return -1; |
| 272 | } |
| 273 | |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | static u32 go7007_functionality(struct i2c_adapter *adapter) |
| 278 | { |
| 279 | return I2C_FUNC_SMBUS_BYTE_DATA; |
| 280 | } |
| 281 | |
| 282 | static struct i2c_algorithm go7007_algo = { |
| 283 | .smbus_xfer = go7007_smbus_xfer, |
| 284 | .master_xfer = go7007_i2c_master_xfer, |
| 285 | .functionality = go7007_functionality, |
| 286 | }; |
| 287 | |
| 288 | static struct i2c_adapter go7007_adap_templ = { |
| 289 | .owner = THIS_MODULE, |
| 290 | .class = I2C_CLASS_TV_ANALOG, |
| 291 | .name = "WIS GO7007SB", |
| 292 | .id = I2C_ALGO_GO7007, |
| 293 | .algo = &go7007_algo, |
| 294 | }; |
| 295 | |
| 296 | int go7007_i2c_init(struct go7007 *go) |
| 297 | { |
| 298 | memcpy(&go->i2c_adapter, &go7007_adap_templ, |
| 299 | sizeof(go7007_adap_templ)); |
| 300 | go->i2c_adapter.dev.parent = go->dev; |
| 301 | i2c_set_adapdata(&go->i2c_adapter, go); |
| 302 | if (i2c_add_adapter(&go->i2c_adapter) < 0) { |
| 303 | printk(KERN_ERR |
| 304 | "go7007-i2c: error: i2c_add_adapter failed\n"); |
| 305 | return -1; |
| 306 | } |
| 307 | return 0; |
| 308 | } |