diff options
Diffstat (limited to 'drivers/media/pci/cx88/cx88-i2c.c')
| -rw-r--r-- | drivers/media/pci/cx88/cx88-i2c.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/media/pci/cx88/cx88-i2c.c b/drivers/media/pci/cx88/cx88-i2c.c new file mode 100644 index 000000000..7fc64aef1 --- /dev/null +++ b/drivers/media/pci/cx88/cx88-i2c.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +/* + * + * cx88-i2c.c -- all the i2c code is here + * + * Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) + * & Marcus Metzler (mocm@thp.uni-koeln.de) + * (c) 2002 Yurij Sysoev <yurij@naturesoft.net> + * (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> + * (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org> + * - Multituner support and i2c address binding + */ + +#include "cx88.h" + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> + +#include <media/v4l2-common.h> + +static unsigned int i2c_debug; +module_param(i2c_debug, int, 0644); +MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); + +static unsigned int i2c_scan; +module_param(i2c_scan, int, 0444); +MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); + +static unsigned int i2c_udelay = 5; +module_param(i2c_udelay, int, 0644); +MODULE_PARM_DESC(i2c_udelay, + "i2c delay at insmod time, in usecs (should be 5 or higher). Lower value means higher bus speed."); + +#define dprintk(level, fmt, arg...) do { \ + if (i2c_debug >= level) \ + printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ + __func__, ##arg); \ +} while (0) + +/* ----------------------------------------------------------------------- */ + +static void cx8800_bit_setscl(void *data, int state) +{ + struct cx88_core *core = data; + + if (state) + core->i2c_state |= 0x02; + else + core->i2c_state &= ~0x02; + cx_write(MO_I2C, core->i2c_state); + cx_read(MO_I2C); +} + +static void cx8800_bit_setsda(void *data, int state) +{ + struct cx88_core *core = data; + + if (state) + core->i2c_state |= 0x01; + else + core->i2c_state &= ~0x01; + cx_write(MO_I2C, core->i2c_state); + cx_read(MO_I2C); +} + +static int cx8800_bit_getscl(void *data) +{ + struct cx88_core *core = data; + u32 state; + + state = cx_read(MO_I2C); + return state & 0x02 ? 1 : 0; +} + +static int cx8800_bit_getsda(void *data) +{ + struct cx88_core *core = data; + u32 state; + + state = cx_read(MO_I2C); + return state & 0x01; +} + +/* ----------------------------------------------------------------------- */ + +static const struct i2c_algo_bit_data cx8800_i2c_algo_template = { + .setsda = cx8800_bit_setsda, + .setscl = cx8800_bit_setscl, + .getsda = cx8800_bit_getsda, + .getscl = cx8800_bit_getscl, + .udelay = 16, + .timeout = 200, +}; + +/* ----------------------------------------------------------------------- */ + +static const char * const i2c_devs[128] = { + [0x1c >> 1] = "lgdt330x", + [0x86 >> 1] = "tda9887/cx22702", + [0xa0 >> 1] = "eeprom", + [0xc0 >> 1] = "tuner (analog)", + [0xc2 >> 1] = "tuner (analog/dvb)", + [0xc8 >> 1] = "xc5000", +}; + +static void do_i2c_scan(const char *name, struct i2c_client *c) +{ + unsigned char buf; + int i, rc; + + for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { + c->addr = i; + rc = i2c_master_recv(c, &buf, 0); + if (rc < 0) + continue; + pr_info("i2c scan: found device @ 0x%x [%s]\n", + i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); + } +} + +/* init + register i2c adapter */ +int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci) +{ + /* Prevents usage of invalid delay values */ + if (i2c_udelay < 5) + i2c_udelay = 5; + + core->i2c_algo = cx8800_i2c_algo_template; + + core->i2c_adap.dev.parent = &pci->dev; + strscpy(core->i2c_adap.name, core->name, sizeof(core->i2c_adap.name)); + core->i2c_adap.owner = THIS_MODULE; + core->i2c_algo.udelay = i2c_udelay; + core->i2c_algo.data = core; + i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev); + core->i2c_adap.algo_data = &core->i2c_algo; + core->i2c_client.adapter = &core->i2c_adap; + strscpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE); + + cx8800_bit_setscl(core, 1); + cx8800_bit_setsda(core, 1); + + core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap); + if (core->i2c_rc == 0) { + static u8 tuner_data[] = { + 0x0b, 0xdc, 0x86, 0x52 }; + static struct i2c_msg tuner_msg = { + .flags = 0, + .addr = 0xc2 >> 1, + .buf = tuner_data, + .len = 4 + }; + + dprintk(1, "i2c register ok\n"); + switch (core->boardnr) { + case CX88_BOARD_HAUPPAUGE_HVR1300: + case CX88_BOARD_HAUPPAUGE_HVR3000: + case CX88_BOARD_HAUPPAUGE_HVR4000: + pr_info("i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n"); + i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1); + break; + default: + break; + } + if (i2c_scan) + do_i2c_scan(core->name, &core->i2c_client); + } else + pr_err("i2c register FAILED\n"); + + return core->i2c_rc; +} |