Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
cx18-i2c.c
Go to the documentation of this file.
1 /*
2  * cx18 I2C functions
3  *
4  * Derived from ivtv-i2c.c
5  *
6  * Copyright (C) 2007 Hans Verkuil <[email protected]>
7  * Copyright (C) 2008 Andy Walls <[email protected]>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22  * 02111-1307 USA
23  */
24 
25 #include "cx18-driver.h"
26 #include "cx18-io.h"
27 #include "cx18-cards.h"
28 #include "cx18-gpio.h"
29 #include "cx18-i2c.h"
30 #include "cx18-irq.h"
31 
32 #define CX18_REG_I2C_1_WR 0xf15000
33 #define CX18_REG_I2C_1_RD 0xf15008
34 #define CX18_REG_I2C_2_WR 0xf25100
35 #define CX18_REG_I2C_2_RD 0xf25108
36 
37 #define SETSCL_BIT 0x0001
38 #define SETSDL_BIT 0x0002
39 #define GETSCL_BIT 0x0004
40 #define GETSDL_BIT 0x0008
41 
42 #define CX18_CS5345_I2C_ADDR 0x4c
43 #define CX18_Z8F0811_IR_TX_I2C_ADDR 0x70
44 #define CX18_Z8F0811_IR_RX_I2C_ADDR 0x71
45 
46 /* This array should match the CX18_HW_ defines */
47 static const u8 hw_addrs[] = {
48  0, /* CX18_HW_TUNER */
49  0, /* CX18_HW_TVEEPROM */
50  CX18_CS5345_I2C_ADDR, /* CX18_HW_CS5345 */
51  0, /* CX18_HW_DVB */
52  0, /* CX18_HW_418_AV */
53  0, /* CX18_HW_GPIO_MUX */
54  0, /* CX18_HW_GPIO_RESET_CTRL */
55  CX18_Z8F0811_IR_TX_I2C_ADDR, /* CX18_HW_Z8F0811_IR_TX_HAUP */
56  CX18_Z8F0811_IR_RX_I2C_ADDR, /* CX18_HW_Z8F0811_IR_RX_HAUP */
57 };
58 
59 /* This array should match the CX18_HW_ defines */
60 /* This might well become a card-specific array */
61 static const u8 hw_bus[] = {
62  1, /* CX18_HW_TUNER */
63  0, /* CX18_HW_TVEEPROM */
64  0, /* CX18_HW_CS5345 */
65  0, /* CX18_HW_DVB */
66  0, /* CX18_HW_418_AV */
67  0, /* CX18_HW_GPIO_MUX */
68  0, /* CX18_HW_GPIO_RESET_CTRL */
69  0, /* CX18_HW_Z8F0811_IR_TX_HAUP */
70  0, /* CX18_HW_Z8F0811_IR_RX_HAUP */
71 };
72 
73 /* This array should match the CX18_HW_ defines */
74 static const char * const hw_devicenames[] = {
75  "tuner",
76  "tveeprom",
77  "cs5345",
78  "cx23418_DTV",
79  "cx23418_AV",
80  "gpio_mux",
81  "gpio_reset_ctrl",
82  "ir_tx_z8f0811_haup",
83  "ir_rx_z8f0811_haup",
84 };
85 
86 static int cx18_i2c_new_ir(struct cx18 *cx, struct i2c_adapter *adap, u32 hw,
87  const char *type, u8 addr)
88 {
89  struct i2c_board_info info;
90  struct IR_i2c_init_data *init_data = &cx->ir_i2c_init_data;
91  unsigned short addr_list[2] = { addr, I2C_CLIENT_END };
92 
93  memset(&info, 0, sizeof(struct i2c_board_info));
94  strlcpy(info.type, type, I2C_NAME_SIZE);
95 
96  /* Our default information for ir-kbd-i2c.c to use */
97  switch (hw) {
99  init_data->ir_codes = RC_MAP_HAUPPAUGE;
101  init_data->type = RC_TYPE_RC5;
102  init_data->name = cx->card_name;
103  info.platform_data = init_data;
104  break;
105  }
106 
107  return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
108  -1 : 0;
109 }
110 
111 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
112 {
113  struct v4l2_subdev *sd;
114  int bus = hw_bus[idx];
115  struct i2c_adapter *adap = &cx->i2c_adap[bus];
116  const char *type = hw_devicenames[idx];
117  u32 hw = 1 << idx;
118 
119  if (idx >= ARRAY_SIZE(hw_addrs))
120  return -1;
121 
122  if (hw == CX18_HW_TUNER) {
123  /* special tuner group handling */
124  sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
125  adap, type, 0, cx->card_i2c->radio);
126  if (sd != NULL)
127  sd->grp_id = hw;
128  sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
129  adap, type, 0, cx->card_i2c->demod);
130  if (sd != NULL)
131  sd->grp_id = hw;
132  sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
133  adap, type, 0, cx->card_i2c->tv);
134  if (sd != NULL)
135  sd->grp_id = hw;
136  return sd != NULL ? 0 : -1;
137  }
138 
139  if (hw & CX18_HW_IR_ANY)
140  return cx18_i2c_new_ir(cx, adap, hw, type, hw_addrs[idx]);
141 
142  /* Is it not an I2C device or one we do not wish to register? */
143  if (!hw_addrs[idx])
144  return -1;
145 
146  /* It's an I2C device other than an analog tuner or IR chip */
147  sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, adap, type, hw_addrs[idx],
148  NULL);
149  if (sd != NULL)
150  sd->grp_id = hw;
151  return sd != NULL ? 0 : -1;
152 }
153 
154 /* Find the first member of the subdev group id in hw */
155 struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
156 {
157  struct v4l2_subdev *result = NULL;
158  struct v4l2_subdev *sd;
159 
160  spin_lock(&cx->v4l2_dev.lock);
162  if (sd->grp_id == hw) {
163  result = sd;
164  break;
165  }
166  }
167  spin_unlock(&cx->v4l2_dev.lock);
168  return result;
169 }
170 
171 static void cx18_setscl(void *data, int state)
172 {
173  struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
174  int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
175  u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
176  u32 r = cx18_read_reg(cx, addr);
177 
178  if (state)
179  cx18_write_reg(cx, r | SETSCL_BIT, addr);
180  else
181  cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
182 }
183 
184 static void cx18_setsda(void *data, int state)
185 {
186  struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
187  int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
188  u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
189  u32 r = cx18_read_reg(cx, addr);
190 
191  if (state)
192  cx18_write_reg(cx, r | SETSDL_BIT, addr);
193  else
194  cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
195 }
196 
197 static int cx18_getscl(void *data)
198 {
199  struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
200  int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
201  u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
202 
203  return cx18_read_reg(cx, addr) & GETSCL_BIT;
204 }
205 
206 static int cx18_getsda(void *data)
207 {
208  struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
209  int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
210  u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
211 
212  return cx18_read_reg(cx, addr) & GETSDL_BIT;
213 }
214 
215 /* template for i2c-bit-algo */
216 static struct i2c_adapter cx18_i2c_adap_template = {
217  .name = "cx18 i2c driver",
218  .algo = NULL, /* set by i2c-algo-bit */
219  .algo_data = NULL, /* filled from template */
220  .owner = THIS_MODULE,
221 };
222 
223 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
224 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
225 
226 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
227  .setsda = cx18_setsda,
228  .setscl = cx18_setscl,
229  .getsda = cx18_getsda,
230  .getscl = cx18_getscl,
231  .udelay = CX18_SCL_PERIOD/2, /* 1/2 clock period in usec*/
232  .timeout = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
233 };
234 
235 /* init + register i2c adapter */
236 int init_cx18_i2c(struct cx18 *cx)
237 {
238  int i, err;
239  CX18_DEBUG_I2C("i2c init\n");
240 
241  for (i = 0; i < 2; i++) {
242  /* Setup algorithm for adapter */
243  memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
244  sizeof(struct i2c_algo_bit_data));
245  cx->i2c_algo_cb_data[i].cx = cx;
246  cx->i2c_algo_cb_data[i].bus_index = i;
247  cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
248 
249  /* Setup adapter */
250  memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
251  sizeof(struct i2c_adapter));
252  cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
253  sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
254  " #%d-%d", cx->instance, i);
255  i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
256  cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
257  }
258 
259  if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
260  /* Reset/Unreset I2C hardware block */
261  /* Clock select 220MHz */
262  cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
263  0x00000000, 0x10001000);
264  /* Clock Enable */
265  cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
266  0x00001000, 0x10001000);
267  }
268  /* courtesy of Steven Toth <[email protected]> */
269  cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
270  mdelay(10);
271  cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
272  mdelay(10);
273  cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
274  mdelay(10);
275 
276  /* Set to edge-triggered intrs. */
277  cx18_write_reg(cx, 0x00c00000, 0xc730c8);
278  /* Clear any stale intrs */
279  cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
281 
282  /* Hw I2C1 Clock Freq ~100kHz */
283  cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
284  cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
285  cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
286 
287  /* Hw I2C2 Clock Freq ~100kHz */
288  cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
289  cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
290  cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
291 
294 
295  err = i2c_bit_add_bus(&cx->i2c_adap[0]);
296  if (err)
297  goto err;
298  err = i2c_bit_add_bus(&cx->i2c_adap[1]);
299  if (err)
300  goto err_del_bus_0;
301  return 0;
302 
303  err_del_bus_0:
304  i2c_del_adapter(&cx->i2c_adap[0]);
305  err:
306  return err;
307 }
308 
309 void exit_cx18_i2c(struct cx18 *cx)
310 {
311  int i;
312  CX18_DEBUG_I2C("i2c exit\n");
313  cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
315  cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
317 
318  for (i = 0; i < 2; i++) {
319  i2c_del_adapter(&cx->i2c_adap[i]);
320  }
321 }
322 
323 /*
324  Hauppauge HVR1600 should have:
325  32 cx24227
326  98 unknown
327  a0 eeprom
328  c2 tuner
329  e? zilog ir
330  */