1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * cx18 I2C functions
4 *
5 * Derived from ivtv-i2c.c
6 *
7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
9 */
10
11 #include "cx18-driver.h"
12 #include "cx18-io.h"
13 #include "cx18-cards.h"
14 #include "cx18-gpio.h"
15 #include "cx18-i2c.h"
16 #include "cx18-irq.h"
17
18 #define CX18_REG_I2C_1_WR 0xf15000
19 #define CX18_REG_I2C_1_RD 0xf15008
20 #define CX18_REG_I2C_2_WR 0xf25100
21 #define CX18_REG_I2C_2_RD 0xf25108
22
23 #define SETSCL_BIT 0x0001
24 #define SETSDL_BIT 0x0002
25 #define GETSCL_BIT 0x0004
26 #define GETSDL_BIT 0x0008
27
28 #define CX18_CS5345_I2C_ADDR 0x4c
29 #define CX18_Z8F0811_IR_TX_I2C_ADDR 0x70
30 #define CX18_Z8F0811_IR_RX_I2C_ADDR 0x71
31
32 /* This array should match the CX18_HW_ defines */
33 static const u8 hw_addrs[] = {
34 0, /* CX18_HW_TUNER */
35 0, /* CX18_HW_TVEEPROM */
36 CX18_CS5345_I2C_ADDR, /* CX18_HW_CS5345 */
37 0, /* CX18_HW_DVB */
38 0, /* CX18_HW_418_AV */
39 0, /* CX18_HW_GPIO_MUX */
40 0, /* CX18_HW_GPIO_RESET_CTRL */
41 CX18_Z8F0811_IR_RX_I2C_ADDR, /* CX18_HW_Z8F0811_IR_HAUP */
42 };
43
44 /* This array should match the CX18_HW_ defines */
45 /* This might well become a card-specific array */
46 static const u8 hw_bus[] = {
47 1, /* CX18_HW_TUNER */
48 0, /* CX18_HW_TVEEPROM */
49 0, /* CX18_HW_CS5345 */
50 0, /* CX18_HW_DVB */
51 0, /* CX18_HW_418_AV */
52 0, /* CX18_HW_GPIO_MUX */
53 0, /* CX18_HW_GPIO_RESET_CTRL */
54 0, /* CX18_HW_Z8F0811_IR_HAUP */
55 };
56
57 /* This array should match the CX18_HW_ defines */
58 static const char * const hw_devicenames[] = {
59 "tuner",
60 "tveeprom",
61 "cs5345",
62 "cx23418_DTV",
63 "cx23418_AV",
64 "gpio_mux",
65 "gpio_reset_ctrl",
66 "ir_z8f0811_haup",
67 };
68
cx18_i2c_new_ir(struct cx18 * cx,struct i2c_adapter * adap,u32 hw,const char * type,u8 addr)69 static int cx18_i2c_new_ir(struct cx18 *cx, struct i2c_adapter *adap, u32 hw,
70 const char *type, u8 addr)
71 {
72 struct i2c_board_info info;
73 struct IR_i2c_init_data *init_data = &cx->ir_i2c_init_data;
74 unsigned short addr_list[2] = { addr, I2C_CLIENT_END };
75
76 memset(&info, 0, sizeof(struct i2c_board_info));
77 strscpy(info.type, type, I2C_NAME_SIZE);
78
79 /* Our default information for ir-kbd-i2c.c to use */
80 switch (hw) {
81 case CX18_HW_Z8F0811_IR_HAUP:
82 init_data->ir_codes = RC_MAP_HAUPPAUGE;
83 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
84 init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
85 RC_PROTO_BIT_RC6_6A_32;
86 init_data->name = cx->card_name;
87 info.platform_data = init_data;
88 break;
89 }
90
91 return IS_ERR(i2c_new_scanned_device(adap, &info, addr_list, NULL)) ?
92 -1 : 0;
93 }
94
cx18_i2c_register(struct cx18 * cx,unsigned idx)95 int cx18_i2c_register(struct cx18 *cx, unsigned idx)
96 {
97 struct v4l2_subdev *sd;
98 int bus = hw_bus[idx];
99 struct i2c_adapter *adap = &cx->i2c_adap[bus];
100 const char *type = hw_devicenames[idx];
101 u32 hw = 1 << idx;
102
103 if (hw == CX18_HW_TUNER) {
104 /* special tuner group handling */
105 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
106 adap, type, 0, cx->card_i2c->radio);
107 if (sd != NULL)
108 sd->grp_id = hw;
109 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
110 adap, type, 0, cx->card_i2c->demod);
111 if (sd != NULL)
112 sd->grp_id = hw;
113 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev,
114 adap, type, 0, cx->card_i2c->tv);
115 if (sd != NULL)
116 sd->grp_id = hw;
117 return sd != NULL ? 0 : -1;
118 }
119
120 if (hw == CX18_HW_Z8F0811_IR_HAUP)
121 return cx18_i2c_new_ir(cx, adap, hw, type, hw_addrs[idx]);
122
123 /* Is it not an I2C device or one we do not wish to register? */
124 if (!hw_addrs[idx])
125 return -1;
126
127 /* It's an I2C device other than an analog tuner or IR chip */
128 sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, adap, type, hw_addrs[idx],
129 NULL);
130 if (sd != NULL)
131 sd->grp_id = hw;
132 return sd != NULL ? 0 : -1;
133 }
134
135 /* Find the first member of the subdev group id in hw */
cx18_find_hw(struct cx18 * cx,u32 hw)136 struct v4l2_subdev *cx18_find_hw(struct cx18 *cx, u32 hw)
137 {
138 struct v4l2_subdev *result = NULL;
139 struct v4l2_subdev *sd;
140
141 spin_lock(&cx->v4l2_dev.lock);
142 v4l2_device_for_each_subdev(sd, &cx->v4l2_dev) {
143 if (sd->grp_id == hw) {
144 result = sd;
145 break;
146 }
147 }
148 spin_unlock(&cx->v4l2_dev.lock);
149 return result;
150 }
151
cx18_setscl(void * data,int state)152 static void cx18_setscl(void *data, int state)
153 {
154 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
155 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
156 u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
157 u32 r = cx18_read_reg(cx, addr);
158
159 if (state)
160 cx18_write_reg(cx, r | SETSCL_BIT, addr);
161 else
162 cx18_write_reg(cx, r & ~SETSCL_BIT, addr);
163 }
164
cx18_setsda(void * data,int state)165 static void cx18_setsda(void *data, int state)
166 {
167 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
168 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
169 u32 addr = bus_index ? CX18_REG_I2C_2_WR : CX18_REG_I2C_1_WR;
170 u32 r = cx18_read_reg(cx, addr);
171
172 if (state)
173 cx18_write_reg(cx, r | SETSDL_BIT, addr);
174 else
175 cx18_write_reg(cx, r & ~SETSDL_BIT, addr);
176 }
177
cx18_getscl(void * data)178 static int cx18_getscl(void *data)
179 {
180 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
181 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
182 u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
183
184 return cx18_read_reg(cx, addr) & GETSCL_BIT;
185 }
186
cx18_getsda(void * data)187 static int cx18_getsda(void *data)
188 {
189 struct cx18 *cx = ((struct cx18_i2c_algo_callback_data *)data)->cx;
190 int bus_index = ((struct cx18_i2c_algo_callback_data *)data)->bus_index;
191 u32 addr = bus_index ? CX18_REG_I2C_2_RD : CX18_REG_I2C_1_RD;
192
193 return cx18_read_reg(cx, addr) & GETSDL_BIT;
194 }
195
196 /* template for i2c-bit-algo */
197 static const struct i2c_adapter cx18_i2c_adap_template = {
198 .name = "cx18 i2c driver",
199 .algo = NULL, /* set by i2c-algo-bit */
200 .algo_data = NULL, /* filled from template */
201 .owner = THIS_MODULE,
202 };
203
204 #define CX18_SCL_PERIOD (10) /* usecs. 10 usec is period for a 100 KHz clock */
205 #define CX18_ALGO_BIT_TIMEOUT (2) /* seconds */
206
207 static const struct i2c_algo_bit_data cx18_i2c_algo_template = {
208 .setsda = cx18_setsda,
209 .setscl = cx18_setscl,
210 .getsda = cx18_getsda,
211 .getscl = cx18_getscl,
212 .udelay = CX18_SCL_PERIOD/2, /* 1/2 clock period in usec*/
213 .timeout = CX18_ALGO_BIT_TIMEOUT*HZ /* jiffies */
214 };
215
216 /* init + register i2c adapter */
init_cx18_i2c(struct cx18 * cx)217 int init_cx18_i2c(struct cx18 *cx)
218 {
219 int i, err;
220 CX18_DEBUG_I2C("i2c init\n");
221
222 for (i = 0; i < 2; i++) {
223 /* Setup algorithm for adapter */
224 cx->i2c_algo[i] = cx18_i2c_algo_template;
225 cx->i2c_algo_cb_data[i].cx = cx;
226 cx->i2c_algo_cb_data[i].bus_index = i;
227 cx->i2c_algo[i].data = &cx->i2c_algo_cb_data[i];
228
229 /* Setup adapter */
230 cx->i2c_adap[i] = cx18_i2c_adap_template;
231 cx->i2c_adap[i].algo_data = &cx->i2c_algo[i];
232 sprintf(cx->i2c_adap[i].name + strlen(cx->i2c_adap[i].name),
233 " #%d-%d", cx->instance, i);
234 i2c_set_adapdata(&cx->i2c_adap[i], &cx->v4l2_dev);
235 cx->i2c_adap[i].dev.parent = &cx->pci_dev->dev;
236 }
237
238 if (cx18_read_reg(cx, CX18_REG_I2C_2_WR) != 0x0003c02f) {
239 /* Reset/Unreset I2C hardware block */
240 /* Clock select 220MHz */
241 cx18_write_reg_expect(cx, 0x10000000, 0xc71004,
242 0x00000000, 0x10001000);
243 /* Clock Enable */
244 cx18_write_reg_expect(cx, 0x10001000, 0xc71024,
245 0x00001000, 0x10001000);
246 }
247 /* courtesy of Steven Toth <stoth@hauppauge.com> */
248 cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
249 mdelay(10);
250 cx18_write_reg_expect(cx, 0x00c000c0, 0xc7001c, 0x000000c0, 0x00c000c0);
251 mdelay(10);
252 cx18_write_reg_expect(cx, 0x00c00000, 0xc7001c, 0x00000000, 0x00c000c0);
253 mdelay(10);
254
255 /* Set to edge-triggered intrs. */
256 cx18_write_reg(cx, 0x00c00000, 0xc730c8);
257 /* Clear any stale intrs */
258 cx18_write_reg_expect(cx, HW2_I2C1_INT|HW2_I2C2_INT, HW2_INT_CLR_STATUS,
259 ~(HW2_I2C1_INT|HW2_I2C2_INT), HW2_I2C1_INT|HW2_I2C2_INT);
260
261 /* Hw I2C1 Clock Freq ~100kHz */
262 cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_1_WR);
263 cx18_setscl(&cx->i2c_algo_cb_data[0], 1);
264 cx18_setsda(&cx->i2c_algo_cb_data[0], 1);
265
266 /* Hw I2C2 Clock Freq ~100kHz */
267 cx18_write_reg(cx, 0x00021c0f & ~4, CX18_REG_I2C_2_WR);
268 cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
269 cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
270
271 cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
272 core, reset, (u32) CX18_GPIO_RESET_I2C);
273
274 err = i2c_bit_add_bus(&cx->i2c_adap[0]);
275 if (err)
276 goto err;
277 err = i2c_bit_add_bus(&cx->i2c_adap[1]);
278 if (err)
279 goto err_del_bus_0;
280 return 0;
281
282 err_del_bus_0:
283 i2c_del_adapter(&cx->i2c_adap[0]);
284 err:
285 return err;
286 }
287
exit_cx18_i2c(struct cx18 * cx)288 void exit_cx18_i2c(struct cx18 *cx)
289 {
290 int i;
291 CX18_DEBUG_I2C("i2c exit\n");
292 cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_1_WR) | 4,
293 CX18_REG_I2C_1_WR);
294 cx18_write_reg(cx, cx18_read_reg(cx, CX18_REG_I2C_2_WR) | 4,
295 CX18_REG_I2C_2_WR);
296
297 for (i = 0; i < 2; i++) {
298 i2c_del_adapter(&cx->i2c_adap[i]);
299 }
300 }
301
302 /*
303 Hauppauge HVR1600 should have:
304 32 cx24227
305 98 unknown
306 a0 eeprom
307 c2 tuner
308 e? zilog ir
309 */
310