1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * cx88-i2c.c  --  all the i2c code is here
7  * Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
8  *			   & Marcus Metzler (mocm@thp.uni-koeln.de)
10  * (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
12  *	- Multituner support and i2c address binding
21 #include <media/v4l2-common.h>
29 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
34 …"i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed.");
42 /* ----------------------------------------------------------------------- */
49 		core->i2c_state |= 0x02;  in cx8800_bit_setscl()
51 		core->i2c_state &= ~0x02;  in cx8800_bit_setscl()
52 	cx_write(MO_I2C, core->i2c_state);  in cx8800_bit_setscl()
61 		core->i2c_state |= 0x01;  in cx8800_bit_setsda()
63 		core->i2c_state &= ~0x01;  in cx8800_bit_setsda()
64 	cx_write(MO_I2C, core->i2c_state);  in cx8800_bit_setsda()
86 /* ----------------------------------------------------------------------- */
97 /* ----------------------------------------------------------------------- */
114 		c->addr = i;  in do_i2c_scan()
118 		pr_info("i2c scan: found device @ 0x%x  [%s]\n",  in do_i2c_scan()
126 	/* Prevents usage of invalid delay values */  in cx88_i2c_init()
130 	core->i2c_algo = cx8800_i2c_algo_template;  in cx88_i2c_init()
132 	core->i2c_adap.dev.parent = &pci->dev;  in cx88_i2c_init()
133 	strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name));  in cx88_i2c_init()
134 	core->i2c_adap.owner = THIS_MODULE;  in cx88_i2c_init()
135 	core->i2c_algo.udelay = i2c_udelay;  in cx88_i2c_init()
136 	core->i2c_algo.data = core;  in cx88_i2c_init()
137 	i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);  in cx88_i2c_init()
138 	core->i2c_adap.algo_data = &core->i2c_algo;  in cx88_i2c_init()
139 	core->i2c_client.adapter = &core->i2c_adap;  in cx88_i2c_init()
140 	strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);  in cx88_i2c_init()
145 	core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);  in cx88_i2c_init()
146 	if (core->i2c_rc == 0) {  in cx88_i2c_init()
157 		switch (core->boardnr) {  in cx88_i2c_init()
162 			i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);  in cx88_i2c_init()
168 			do_i2c_scan(core->name, &core->i2c_client);  in cx88_i2c_init()
172 	return core->i2c_rc;  in cx88_i2c_init()