?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
hwrng: core - Don't use a stack buffer in add_early_randomness()
[linux/fpc-iii.git] / drivers / media / pci / cx18 / cx18-i2c.c
blobc9329371a3f8ed867b1c1beeb335789122971849
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@md.metrocast.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 #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) {
98 case CX18_HW_Z8F0811_IR_RX_HAUP:
99 init_data->ir_codes = RC_MAP_HAUPPAUGE;
100 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
101 init_data->type = RC_BIT_RC5 | RC_BIT_RC6_MCE |
102 RC_BIT_RC6_6A_32;
103 init_data->name = cx->card_name;
104 info.platform_data = init_data;
105 break;
106 }
107
108 return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
109 -1 : 0;
110 }
111
112 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
113 {
114 struct v4l2_subdev *sd;
115 int bus = hw_bus[idx];
116 struct i2c_adapter *adap = &cx->i2c_adap[bus];
117 const char *type = hw_devicenames[idx];
118 u32 hw = 1 << idx;
119
120 if (hw == CX18_HW_TUNER) {
121 /* special tuner group handling */
122 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
123 adap, type, 0, cx->card_i2c->radio);
124 if (sd != NULL)
125 sd->grp_id = hw;
126 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
127 adap, type, 0, cx->card_i2c->demod);
128 if (sd != NULL)
129 sd->grp_id = hw;
130 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
131 adap, type, 0, cx->card_i2c->tv);
132 if (sd != NULL)
133 sd->grp_id = hw;
134 return sd != NULL ? 0 : -1;
135 }
136
137 if (hw & CX18_HW_IR_ANY)
138 return cx18_i2c_new_ir(cx, adap, hw, type, hw_addrs[idx]);
139
140 /* Is it not an I2C device or one we do not wish to register? */
141 if (!hw_addrs[idx])
142 return -1;
143
144 /* It's an I2C device other than an analog tuner or IR chip */
145 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, adap, type, hw_addrs[idx],
146 NULL);
147 if (sd != NULL)
148 sd->grp_id = hw;
149 return sd != NULL ? 0 : -1;
150 }
151
152 /* Find the first member of the subdev group id in hw */
153 struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
154 {
155 struct v4l2_subdev *result = NULL;
156 struct v4l2_subdev *sd;
157
158 spin_lock(&cx->v4l2_dev.lock);
159 v4l2_device_for_each_subdev(sd, &cx->v4l2_dev) {
160 if (sd->grp_id == hw) {
161 result = sd;
162 break;
163 }
164 }
165 spin_unlock(&cx->v4l2_dev.lock);
166 return result;
167 }
168
169 static void cx18_setscl(void *data, int state)
170 {
171 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
172 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
173 u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
174 u32 r = cx18_read_reg(cx, addr);
175
176 if (state)
177 cx18_write_reg(cx, r | SETSCL_BIT, addr);
178 else
179 cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
180 }
181
182 static void cx18_setsda(void *data, int state)
183 {
184 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
185 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
186 u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
187 u32 r = cx18_read_reg(cx, addr);
188
189 if (state)
190 cx18_write_reg(cx, r | SETSDL_BIT, addr);
191 else
192 cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
193 }
194
195 static int cx18_getscl(void *data)
196 {
197 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
198 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
199 u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
200
201 return cx18_read_reg(cx, addr) & GETSCL_BIT;
202 }
203
204 static int cx18_getsda(void *data)
205 {
206 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
207 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
208 u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
209
210 return cx18_read_reg(cx, addr) & GETSDL_BIT;
211 }
212
213 /* template for i2c-bit-algo */
214 static struct i2c_adapter cx18_i2c_adap_template = {
215 .name = "cx18 i2c driver",
216 .algo = NULL, /* set by i2c-algo-bit */
217 .algo_data = NULL, /* filled from template */
218 .owner = THIS_MODULE,
219 };
220
221 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
222 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
223
224 static struct i2c_algo_bit_data cx18_i2c_algo_template = {
225 .setsda = cx18_setsda,
226 .setscl = cx18_setscl,
227 .getsda = cx18_getsda,
228 .getscl = cx18_getscl,
229 .udelay = CX18_SCL_PERIOD/2, /* 1/2 clock period in usec*/
230 .timeout = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
231 };
232
233 /* init + register i2c adapter */
234 int init_cx18_i2c(struct cx18 *cx)
235 {
236 int i, err;
237 CX18_DEBUG_I2C("i2c init\n");
238
239 for (i = 0; i < 2; i++) {
240 /* Setup algorithm for adapter */
241 cx->i2c_algo[i] = cx18_i2c_algo_template;
242 cx->i2c_algo_cb_data[i].cx = cx;
243 cx->i2c_algo_cb_data[i].bus_index = i;
244 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
245
246 /* Setup adapter */
247 cx->i2c_adap[i] = cx18_i2c_adap_template;
248 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
249 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
250 " #%d-%d", cx->instance, i);
251 i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
252 cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
253 }
254
255 if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
256 /* Reset/Unreset I2C hardware block */
257 /* Clock select 220MHz */
258 cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
259 0x00000000, 0x10001000);
260 /* Clock Enable */
261 cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
262 0x00001000, 0x10001000);
263 }
264 /* courtesy of Steven Toth <stoth@hauppauge.com> */
265 cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
266 mdelay(10);
267 cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
268 mdelay(10);
269 cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
270 mdelay(10);
271
272 /* Set to edge-triggered intrs. */
273 cx18_write_reg(cx, 0x00c00000, 0xc730c8);
274 /* Clear any stale intrs */
275 cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
276 ~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
277
278 /* Hw I2C1 Clock Freq ~100kHz */
279 cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
280 cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
281 cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
282
283 /* Hw I2C2 Clock Freq ~100kHz */
284 cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
285 cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
286 cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
287
288 cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
289 core, reset, (u32) CX18_GPIO_RESET_I2C);
290
291 err = i2c_bit_add_bus(&cx->i2c_adap[0]);
292 if (err)
293 goto err;
294 err = i2c_bit_add_bus(&cx->i2c_adap[1]);
295 if (err)
296 goto err_del_bus_0;
297 return 0;
298
299 err_del_bus_0:
300 i2c_del_adapter(&cx->i2c_adap[0]);
301 err:
302 return err;
303 }
304
305 void exit_cx18_i2c(struct cx18 *cx)
306 {
307 int i;
308 CX18_DEBUG_I2C("i2c exit\n");
309 cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
310 CX18_REG_I2C_1_WR);
311 cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
312 CX18_REG_I2C_2_WR);
313
314 for (i = 0; i < 2; i++) {
315 i2c_del_adapter(&cx->i2c_adap[i]);
316 }
317 }
318
319 /*
320 Hauppauge HVR1600 should have:
321 32 cx24227
322 98 unknown
323 a0 eeprom
324 c2 tuner
325 e? zilog ir
326 */
Linux with added FPC-III support