diff options
Diffstat (limited to 'drivers/media/pci/tw68/tw68-i2c.c')
| -rw-r--r-- | drivers/media/pci/tw68/tw68-i2c.c | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/drivers/media/pci/tw68/tw68-i2c.c b/drivers/media/pci/tw68/tw68-i2c.c deleted file mode 100644 index 38659d0b1e18..000000000000 --- a/drivers/media/pci/tw68/tw68-i2c.c +++ /dev/null @@ -1,245 +0,0 @@ -/* - * tw68 code to handle the i2c interface. - * - * Much of this code is derived from the bt87x driver. The original - * work was by Gerd Knorr; more recently the code was enhanced by Mauro - * Carvalho Chehab. Their work is gratefully acknowledged. Full credit - * goes to them - any problems within this code are mine. - * - * Copyright (C) 2009 William M. Brack <wbrack@mmm.com.hk> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include <linux/init.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/delay.h> - -#include "tw68.h" -#include <media/v4l2-common.h> -#include <linux/i2c-algo-bit.h> - -/*----------------------------------------------------------------*/ - -static unsigned int i2c_debug; -module_param(i2c_debug, int, 0644); -MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); - -#if 0 -static unsigned int i2c_scan; -module_param(i2c_scan, int, 0444); -MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); -#endif - -#define d1printk if (1 == i2c_debug) printk - -#define I2C_CLOCK 0xa6 /* 99.4 kHz */ - -/*----------------------------------------------------------------------*/ -/* Although the TW68xx i2c controller has a "hardware" mode, where all of - * the low-level i2c/smbbus is handled by the chip, it appears that mode - * is not suitable for linux i2c handling routines because extended "bursts" - * of data (sequences of bytes without intervening START/STOP bits) are - * not possible. Instead, we put the chip into "software" mode, and handle - * the i2c bus at a low level. To accomplish this, we use the routines - * from the i2c modules. - * - * Because the particular boards which I had for testing did not have any - * devices attached to the i2c bus, I have been unable to test these - * routines. - */ - -/*----------------------------------------------------------------------*/ -/* I2C functions - "bit-banging" adapter (software i2c) */ - -/* tw68_bit_setcl - * Handles "toggling" the i2c clock bit - */ -static void tw68_bit_setscl(void *data, int state) -{ - struct tw68_dev *dev = data; - - tw_andorb(TW68_SBUSC, (state ? 1 : 0) << TW68_SSCLK, TW68_SSCLK_B); -} - -/* tw68_bit_setsda - * Handles "toggling" the i2c data bit - */ -static void tw68_bit_setsda(void *data, int state) -{ - struct tw68_dev *dev = data; - - tw_andorb(TW68_SBUSC, (state ? 1 : 0) << TW68_SSDAT, TW68_SSDAT_B); -} - -/* tw68_bit_getscl - * - * Returns the current state of the clock bit - */ -static int tw68_bit_getscl(void *data) -{ - struct tw68_dev *dev = data; - - return (tw_readb(TW68_SBUSC) & TW68_SSCLK_B) ? 1 : 0; -} - -/* tw68_bit_getsda - * - * Returns the current state of the data bit - */ -static int tw68_bit_getsda(void *data) -{ - struct tw68_dev *dev = data; - - return (tw_readb(TW68_SBUSC) & TW68_SSDAT_B) ? 1 : 0; -} - -static struct i2c_algo_bit_data __devinitdata tw68_i2c_algo_bit_template = { - .setsda = tw68_bit_setsda, - .setscl = tw68_bit_setscl, - .getsda = tw68_bit_getsda, - .getscl = tw68_bit_getscl, - .udelay = 16, - .timeout = 200, -}; - -static struct i2c_client tw68_client_template = { - .name = "tw68 internal", -}; - -/*----------------------------------------------------------------*/ - -static int attach_inform(struct i2c_client *client) -{ -/* struct tw68_dev *dev = client->adapter->algo_data; */ - - d1printk("%s i2c attach [addr=0x%x,client=%s]\n", - client->driver->driver.name, client->addr, client->name); - - switch (client->addr) { - /* No info yet on what addresses to expect */ - } - - return 0; -} - -static struct i2c_adapter tw68_adap_sw_template = { - .owner = THIS_MODULE, - .name = "tw68_sw", - .client_register = attach_inform, -}; - -static int tw68_i2c_eeprom(struct tw68_dev *dev, unsigned char *eedata, - int len) -{ - unsigned char buf; - int i, err; - - dev->i2c_client.addr = 0xa0 >> 1; - buf = 256 - len; - - err = i2c_master_send(&dev->i2c_client, &buf, 1); - if (1 != err) { - printk(KERN_INFO "%s: Huh, no eeprom present (err = %d)?\n", - dev->name, err); - return -1; - } - err = i2c_master_recv(&dev->i2c_client, eedata, len); - if (len != err) { - printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n", - dev->name, err); - return -1; - } - - for (i = 0; i < len; i++) { - if (0 == (i % 16)) - printk(KERN_INFO "%s: i2c eeprom %02x:", - dev->name, i); - printk(KERN_INFO " %02x", eedata[i]); - if (15 == (i % 16)) - printk("\n"); - } - return 0; -} - -#if 0 -static char *i2c_devs[128] = { - [0xa0 >> 1] = "eeprom", -}; - -static void do_i2c_scan(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, 1); - if (rc < 0) - continue; - printk(KERN_INFO "%s: i2c scan: found device " - "@ 0x%x [%s]\n", name, i << 1, - i2c_devs[i] ? i2c_devs[i] : "???"); - } -} -#endif - -int __devinit tw68_i2c_register(struct tw68_dev *dev) -{ - int rc; - -printk(KERN_DEBUG "%s: Registering i2c module\n", __func__); - tw_writeb(TW68_I2C_RST, 1); /* reset the i2c module */ - - memcpy(&dev->i2c_client, &tw68_client_template, - sizeof(tw68_client_template)); - - memcpy(&dev->i2c_adap, &tw68_adap_sw_template, - sizeof(tw68_adap_sw_template)); - dev->i2c_adap.algo_data = &dev->i2c_algo; - dev->i2c_adap.dev.parent = &dev->pci->dev; - - memcpy(&dev->i2c_algo, &tw68_i2c_algo_bit_template, - sizeof(tw68_i2c_algo_bit_template)); - dev->i2c_algo.data = dev; - /* TODO - may want to set better name (see bttv code) */ - - i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); - dev->i2c_client.adapter = &dev->i2c_adap; - - /* Assure chip is in "software" mode */ - tw_writel(TW68_SBUSC, TW68_SSDAT | TW68_SSCLK); - tw68_bit_setscl(dev, 1); - tw68_bit_setsda(dev, 1); - - rc = i2c_bit_add_bus(&dev->i2c_adap); - - tw68_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata)); -#if 0 - if (i2c_scan) - do_i2c_scan(dev->name, &dev->i2c_client); -#endif - - return rc; -} - -int tw68_i2c_unregister(struct tw68_dev *dev) -{ - i2c_del_adapter(&dev->i2c_adap); - return 0; -} |