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b31506c4 MK |
1 | /* |
2 | Auvitek AU8522 QAM/8VSB demodulator driver | |
3 | ||
4 | Copyright (C) 2008 Steven Toth <stoth@linuxtv.org> | |
5 | Copyright (C) 2008 Devin Heitmueller <dheitmueller@linuxtv.org> | |
6 | Copyright (C) 2005-2008 Auvitek International, Ltd. | |
7 | Copyright (C) 2012 Michael Krufky <mkrufky@linuxtv.org> | |
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., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | */ | |
24 | ||
25 | #include <linux/i2c.h> | |
26 | #include "dvb_frontend.h" | |
27 | #include "au8522_priv.h" | |
28 | ||
29 | static int debug; | |
30 | ||
31 | #define dprintk(arg...)\ | |
32 | do { if (debug)\ | |
33 | printk(arg);\ | |
34 | } while (0) | |
35 | ||
36 | /* Despite the name "hybrid_tuner", the framework works just as well for | |
37 | hybrid demodulators as well... */ | |
38 | static LIST_HEAD(hybrid_tuner_instance_list); | |
39 | static DEFINE_MUTEX(au8522_list_mutex); | |
40 | ||
41 | /* 16 bit registers, 8 bit values */ | |
42 | int au8522_writereg(struct au8522_state *state, u16 reg, u8 data) | |
43 | { | |
44 | int ret; | |
45 | u8 buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; | |
46 | ||
aa37763f | 47 | struct i2c_msg msg = { .addr = state->config.demod_address, |
b31506c4 MK |
48 | .flags = 0, .buf = buf, .len = 3 }; |
49 | ||
50 | ret = i2c_transfer(state->i2c, &msg, 1); | |
51 | ||
52 | if (ret != 1) | |
53 | printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, " | |
54 | "ret == %i)\n", __func__, reg, data, ret); | |
55 | ||
56 | return (ret != 1) ? -1 : 0; | |
57 | } | |
58 | EXPORT_SYMBOL(au8522_writereg); | |
59 | ||
60 | u8 au8522_readreg(struct au8522_state *state, u16 reg) | |
61 | { | |
62 | int ret; | |
63 | u8 b0[] = { (reg >> 8) | 0x40, reg & 0xff }; | |
64 | u8 b1[] = { 0 }; | |
65 | ||
66 | struct i2c_msg msg[] = { | |
aa37763f | 67 | { .addr = state->config.demod_address, .flags = 0, |
b31506c4 | 68 | .buf = b0, .len = 2 }, |
aa37763f | 69 | { .addr = state->config.demod_address, .flags = I2C_M_RD, |
b31506c4 MK |
70 | .buf = b1, .len = 1 } }; |
71 | ||
72 | ret = i2c_transfer(state->i2c, msg, 2); | |
73 | ||
74 | if (ret != 2) | |
75 | printk(KERN_ERR "%s: readreg error (ret == %i)\n", | |
76 | __func__, ret); | |
77 | return b1[0]; | |
78 | } | |
79 | EXPORT_SYMBOL(au8522_readreg); | |
80 | ||
81 | int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) | |
82 | { | |
83 | struct au8522_state *state = fe->demodulator_priv; | |
84 | ||
85 | dprintk("%s(%d)\n", __func__, enable); | |
86 | ||
87 | if (state->operational_mode == AU8522_ANALOG_MODE) { | |
88 | /* We're being asked to manage the gate even though we're | |
89 | not in digital mode. This can occur if we get switched | |
90 | over to analog mode before the dvb_frontend kernel thread | |
91 | has completely shutdown */ | |
92 | return 0; | |
93 | } | |
94 | ||
95 | if (enable) | |
96 | return au8522_writereg(state, 0x106, 1); | |
97 | else | |
98 | return au8522_writereg(state, 0x106, 0); | |
99 | } | |
100 | EXPORT_SYMBOL(au8522_i2c_gate_ctrl); | |
101 | ||
4a03dafc DH |
102 | int au8522_analog_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) |
103 | { | |
104 | struct au8522_state *state = fe->demodulator_priv; | |
105 | ||
106 | dprintk("%s(%d)\n", __func__, enable); | |
107 | ||
108 | if (enable) | |
109 | return au8522_writereg(state, 0x106, 1); | |
110 | else | |
111 | return au8522_writereg(state, 0x106, 0); | |
112 | } | |
113 | EXPORT_SYMBOL(au8522_analog_i2c_gate_ctrl); | |
114 | ||
b31506c4 MK |
115 | /* Reset the demod hardware and reset all of the configuration registers |
116 | to a default state. */ | |
117 | int au8522_get_state(struct au8522_state **state, struct i2c_adapter *i2c, | |
118 | u8 client_address) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | mutex_lock(&au8522_list_mutex); | |
123 | ret = hybrid_tuner_request_state(struct au8522_state, (*state), | |
124 | hybrid_tuner_instance_list, | |
125 | i2c, client_address, "au8522"); | |
126 | mutex_unlock(&au8522_list_mutex); | |
127 | ||
128 | return ret; | |
129 | } | |
130 | EXPORT_SYMBOL(au8522_get_state); | |
131 | ||
132 | void au8522_release_state(struct au8522_state *state) | |
133 | { | |
134 | mutex_lock(&au8522_list_mutex); | |
135 | if (state != NULL) | |
136 | hybrid_tuner_release_state(state); | |
137 | mutex_unlock(&au8522_list_mutex); | |
138 | } | |
139 | EXPORT_SYMBOL(au8522_release_state); | |
140 | ||
52dbb57c | 141 | static int au8522_led_gpio_enable(struct au8522_state *state, int onoff) |
b31506c4 | 142 | { |
aa37763f | 143 | struct au8522_led_config *led_config = state->config.led_cfg; |
b31506c4 MK |
144 | u8 val; |
145 | ||
146 | /* bail out if we can't control an LED */ | |
147 | if (!led_config || !led_config->gpio_output || | |
148 | !led_config->gpio_output_enable || !led_config->gpio_output_disable) | |
149 | return 0; | |
150 | ||
151 | val = au8522_readreg(state, 0x4000 | | |
152 | (led_config->gpio_output & ~0xc000)); | |
153 | if (onoff) { | |
154 | /* enable GPIO output */ | |
155 | val &= ~((led_config->gpio_output_enable >> 8) & 0xff); | |
156 | val |= (led_config->gpio_output_enable & 0xff); | |
157 | } else { | |
158 | /* disable GPIO output */ | |
159 | val &= ~((led_config->gpio_output_disable >> 8) & 0xff); | |
160 | val |= (led_config->gpio_output_disable & 0xff); | |
161 | } | |
162 | return au8522_writereg(state, 0x8000 | | |
163 | (led_config->gpio_output & ~0xc000), val); | |
164 | } | |
b31506c4 MK |
165 | |
166 | /* led = 0 | off | |
167 | * led = 1 | signal ok | |
168 | * led = 2 | signal strong | |
169 | * led < 0 | only light led if leds are currently off | |
170 | */ | |
171 | int au8522_led_ctrl(struct au8522_state *state, int led) | |
172 | { | |
aa37763f | 173 | struct au8522_led_config *led_config = state->config.led_cfg; |
b31506c4 MK |
174 | int i, ret = 0; |
175 | ||
176 | /* bail out if we can't control an LED */ | |
177 | if (!led_config || !led_config->gpio_leds || | |
178 | !led_config->num_led_states || !led_config->led_states) | |
179 | return 0; | |
180 | ||
181 | if (led < 0) { | |
182 | /* if LED is already lit, then leave it as-is */ | |
183 | if (state->led_state) | |
184 | return 0; | |
185 | else | |
186 | led *= -1; | |
187 | } | |
188 | ||
189 | /* toggle LED if changing state */ | |
190 | if (state->led_state != led) { | |
191 | u8 val; | |
192 | ||
193 | dprintk("%s: %d\n", __func__, led); | |
194 | ||
195 | au8522_led_gpio_enable(state, 1); | |
196 | ||
197 | val = au8522_readreg(state, 0x4000 | | |
198 | (led_config->gpio_leds & ~0xc000)); | |
199 | ||
200 | /* start with all leds off */ | |
201 | for (i = 0; i < led_config->num_led_states; i++) | |
202 | val &= ~led_config->led_states[i]; | |
203 | ||
204 | /* set selected LED state */ | |
205 | if (led < led_config->num_led_states) | |
206 | val |= led_config->led_states[led]; | |
207 | else if (led_config->num_led_states) | |
208 | val |= | |
209 | led_config->led_states[led_config->num_led_states - 1]; | |
210 | ||
211 | ret = au8522_writereg(state, 0x8000 | | |
212 | (led_config->gpio_leds & ~0xc000), val); | |
213 | if (ret < 0) | |
214 | return ret; | |
215 | ||
216 | state->led_state = led; | |
217 | ||
218 | if (led == 0) | |
219 | au8522_led_gpio_enable(state, 0); | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | EXPORT_SYMBOL(au8522_led_ctrl); | |
225 | ||
226 | int au8522_init(struct dvb_frontend *fe) | |
227 | { | |
228 | struct au8522_state *state = fe->demodulator_priv; | |
229 | dprintk("%s()\n", __func__); | |
230 | ||
231 | state->operational_mode = AU8522_DIGITAL_MODE; | |
232 | ||
233 | /* Clear out any state associated with the digital side of the | |
234 | chip, so that when it gets powered back up it won't think | |
235 | that it is already tuned */ | |
236 | state->current_frequency = 0; | |
237 | ||
238 | au8522_writereg(state, 0xa4, 1 << 5); | |
239 | ||
240 | au8522_i2c_gate_ctrl(fe, 1); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | EXPORT_SYMBOL(au8522_init); | |
245 | ||
246 | int au8522_sleep(struct dvb_frontend *fe) | |
247 | { | |
248 | struct au8522_state *state = fe->demodulator_priv; | |
249 | dprintk("%s()\n", __func__); | |
250 | ||
251 | /* Only power down if the digital side is currently using the chip */ | |
252 | if (state->operational_mode == AU8522_ANALOG_MODE) { | |
253 | /* We're not in one of the expected power modes, which means | |
254 | that the DVB thread is probably telling us to go to sleep | |
255 | even though the analog frontend has already started using | |
256 | the chip. So ignore the request */ | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* turn off led */ | |
261 | au8522_led_ctrl(state, 0); | |
262 | ||
263 | /* Power down the chip */ | |
264 | au8522_writereg(state, 0xa4, 1 << 5); | |
265 | ||
266 | state->current_frequency = 0; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | EXPORT_SYMBOL(au8522_sleep); | |
d6b82678 DH |
271 | |
272 | module_param(debug, int, 0644); | |
273 | MODULE_PARM_DESC(debug, "Enable verbose debug messages"); | |
274 | ||
275 | MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver"); | |
276 | MODULE_AUTHOR("Steven Toth"); | |
277 | MODULE_LICENSE("GPL"); |