Merge branch 'linus' into irq/threaded
[linux-2.6] / drivers / media / video / cx18 / cx18-i2c.c
1 /*
2  *  cx18 I2C functions
3  *
4  *  Derived from ivtv-i2c.c
5  *
6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
7  *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
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
44 /* This array should match the CX18_HW_ defines */
45 static const u8 hw_addrs[] = {
46         0,                      /* CX18_HW_TUNER */
47         0,                      /* CX18_HW_TVEEPROM */
48         CX18_CS5345_I2C_ADDR,   /* CX18_HW_CS5345 */
49         0,                      /* CX18_HW_DVB */
50         0,                      /* CX18_HW_418_AV */
51         0,                      /* CX18_HW_GPIO_MUX */
52         0,                      /* CX18_HW_GPIO_RESET_CTRL */
53 };
54
55 /* This array should match the CX18_HW_ defines */
56 /* This might well become a card-specific array */
57 static const u8 hw_bus[] = {
58         1,      /* CX18_HW_TUNER */
59         0,      /* CX18_HW_TVEEPROM */
60         0,      /* CX18_HW_CS5345 */
61         0,      /* CX18_HW_DVB */
62         0,      /* CX18_HW_418_AV */
63         0,      /* CX18_HW_GPIO_MUX */
64         0,      /* CX18_HW_GPIO_RESET_CTRL */
65 };
66
67 /* This array should match the CX18_HW_ defines */
68 static const char * const hw_modules[] = {
69         "tuner",        /* CX18_HW_TUNER */
70         NULL,           /* CX18_HW_TVEEPROM */
71         "cs5345",       /* CX18_HW_CS5345 */
72         NULL,           /* CX18_HW_DVB */
73         NULL,           /* CX18_HW_418_AV */
74         NULL,           /* CX18_HW_GPIO_MUX */
75         NULL,           /* CX18_HW_GPIO_RESET_CTRL */
76 };
77
78 /* This array should match the CX18_HW_ defines */
79 static const char * const hw_devicenames[] = {
80         "tuner",
81         "tveeprom",
82         "cs5345",
83         "cx23418_DTV",
84         "cx23418_AV",
85         "gpio_mux",
86         "gpio_reset_ctrl",
87 };
88
89 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
90 {
91         struct v4l2_subdev *sd;
92         int bus = hw_bus[idx];
93         struct i2c_adapter *adap = &cx->i2c_adap[bus];
94         const char *mod = hw_modules[idx];
95         const char *type = hw_devicenames[idx];
96         u32 hw = 1 << idx;
97
98         if (idx >= ARRAY_SIZE(hw_addrs))
99                 return -1;
100
101         if (hw == CX18_HW_TUNER) {
102                 /* special tuner group handling */
103                 sd = v4l2_i2c_new_probed_subdev(adap, mod, type,
104                                                 cx->card_i2c->radio);
105                 if (sd != NULL)
106                         sd->grp_id = hw;
107                 sd = v4l2_i2c_new_probed_subdev(adap, mod, type,
108                                                 cx->card_i2c->demod);
109                 if (sd != NULL)
110                         sd->grp_id = hw;
111                 sd = v4l2_i2c_new_probed_subdev(adap, mod, type,
112                                                 cx->card_i2c->tv);
113                 if (sd != NULL)
114                         sd->grp_id = hw;
115                 return sd != NULL ? 0 : -1;
116         }
117
118         /* Is it not an I2C device or one we do not wish to register? */
119         if (!hw_addrs[idx])
120                 return -1;
121
122         /* It's an I2C device other than an analog tuner */
123         sd = v4l2_i2c_new_subdev(adap, mod, type, hw_addrs[idx]);
124         if (sd != NULL)
125                 sd->grp_id = hw;
126         return sd != NULL ? 0 : -1;
127 }
128
129 /* Find the first member of the subdev group id in hw */
130 struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
131 {
132         struct v4l2_subdev *result = NULL;
133         struct v4l2_subdev *sd;
134
135         spin_lock(&cx->v4l2_dev.lock);
136         v4l2_device_for_each_subdev(sd, &cx->v4l2_dev) {
137                 if (sd->grp_id == hw) {
138                         result = sd;
139                         break;
140                 }
141         }
142         spin_unlock(&cx->v4l2_dev.lock);
143         return result;
144 }
145
146 static void cx18_setscl(void *data, int state)
147 {
148         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
149         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
150         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
151         u32 r = cx18_read_reg(cx, addr);
152
153         if (state)
154                 cx18_write_reg(cx, r | SETSCL_BIT, addr);
155         else
156                 cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
157 }
158
159 static void cx18_setsda(void *data, int state)
160 {
161         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
162         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
163         u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
164         u32 r = cx18_read_reg(cx, addr);
165
166         if (state)
167                 cx18_write_reg(cx, r | SETSDL_BIT, addr);
168         else
169                 cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
170 }
171
172 static int cx18_getscl(void *data)
173 {
174         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
175         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
176         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
177
178         return cx18_read_reg(cx, addr) & GETSCL_BIT;
179 }
180
181 static int cx18_getsda(void *data)
182 {
183         struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
184         int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
185         u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
186
187         return cx18_read_reg(cx, addr) & GETSDL_BIT;
188 }
189
190 /* template for i2c-bit-algo */
191 static struct i2c_adapter cx18_i2c_adap_template = {
192         .name = "cx18 i2c driver",
193         .id = I2C_HW_B_CX2341X,
194         .algo = NULL,                   /* set by i2c-algo-bit */
195         .algo_data = NULL,              /* filled from template */
196         .owner = THIS_MODULE,
197 };
198
199 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
200 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
201
202 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
203         .setsda         = cx18_setsda,
204         .setscl         = cx18_setscl,
205         .getsda         = cx18_getsda,
206         .getscl         = cx18_getscl,
207         .udelay         = CX18_SCL_PERIOD/2,       /* 1/2 clock period in usec*/
208         .timeout        = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
209 };
210
211 /* init + register i2c algo-bit adapter */
212 int init_cx18_i2c(struct cx18 *cx)
213 {
214         int i;
215         CX18_DEBUG_I2C("i2c init\n");
216
217         for (i = 0; i < 2; i++) {
218                 /* Setup algorithm for adapter */
219                 memcpy(&cx->i2c_algo[i], &cx18_i2c_algo_template,
220                         sizeof(struct i2c_algo_bit_data));
221                 cx->i2c_algo_cb_data[i].cx = cx;
222                 cx->i2c_algo_cb_data[i].bus_index = i;
223                 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
224
225                 /* Setup adapter */
226                 memcpy(&cx->i2c_adap[i], &cx18_i2c_adap_template,
227                         sizeof(struct i2c_adapter));
228                 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
229                 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
230                                 " #%d-%d", cx->instance, i);
231                 i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
232                 cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
233         }
234
235         if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
236                 /* Reset/Unreset I2C hardware block */
237                 /* Clock select 220MHz */
238                 cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
239                                           0x00000000, 0x10001000);
240                 /* Clock Enable */
241                 cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
242                                           0x00001000, 0x10001000);
243         }
244         /* courtesy of Steven Toth <stoth@hauppauge.com> */
245         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
246         mdelay(10);
247         cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
248         mdelay(10);
249         cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
250         mdelay(10);
251
252         /* Set to edge-triggered intrs. */
253         cx18_write_reg(cx, 0x00c00000, 0xc730c8);
254         /* Clear any stale intrs */
255         cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
256                        ~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
257
258         /* Hw I2C1 Clock Freq ~100kHz */
259         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
260         cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
261         cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
262
263         /* Hw I2C2 Clock Freq ~100kHz */
264         cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
265         cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
266         cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
267
268         cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
269                      core, reset, (u32) CX18_GPIO_RESET_I2C);
270
271         return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
272                 i2c_bit_add_bus(&cx->i2c_adap[1]);
273 }
274
275 void exit_cx18_i2c(struct cx18 *cx)
276 {
277         int i;
278         CX18_DEBUG_I2C("i2c exit\n");
279         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
280                                                         CX18_REG_I2C_1_WR);
281         cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
282                                                         CX18_REG_I2C_2_WR);
283
284         for (i = 0; i < 2; i++) {
285                 i2c_del_adapter(&cx->i2c_adap[i]);
286         }
287 }
288
289 /*
290    Hauppauge HVR1600 should have:
291    32 cx24227
292    98 unknown
293    a0 eeprom
294    c2 tuner
295    e? zilog ir
296    */