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Diffstat (limited to 'drivers/media/video/em28xx/em28xx-i2c.c')
-rw-r--r--drivers/media/video/em28xx/em28xx-i2c.c586
1 files changed, 586 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-i2c.c b/drivers/media/video/em28xx/em28xx-i2c.c
new file mode 100644
index 0000000..b32d985
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-i2c.c
@@ -0,0 +1,586 @@
+/*
+ em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
+
+ Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
+ Markus Rechberger <mrechberger@gmail.com>
+ Mauro Carvalho Chehab <mchehab@brturbo.com.br>
+ Sascha Sommer <saschasommer@freenet.de>
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <linux/video_decoder.h>
+
+#include "em28xx.h"
+#include <media/tuner.h>
+
+/* ----------------------------------------------------------- */
+
+static unsigned int i2c_scan = 0;
+module_param(i2c_scan, int, 0444);
+MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
+
+static unsigned int i2c_debug = 0;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\
+ printk(fmt , ##args); } while (0)
+#define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
+ printk(KERN_DEBUG "%s at %s: " fmt, \
+ dev->name, __FUNCTION__ , ##args); } while (0)
+
+/*
+ * em2800_i2c_send_max4()
+ * send up to 4 bytes to the i2c device
+ */
+static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
+ char *buf, int len)
+{
+ int ret;
+ int write_timeout;
+ unsigned char b2[6];
+ BUG_ON(len < 1 || len > 4);
+ b2[5] = 0x80 + len - 1;
+ b2[4] = addr;
+ b2[3] = buf[0];
+ if (len > 1)
+ b2[2] = buf[1];
+ if (len > 2)
+ b2[1] = buf[2];
+ if (len > 3)
+ b2[0] = buf[3];
+
+ ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
+ if (ret != 2 + len) {
+ em28xx_warn("writting to i2c device failed (error=%i)\n", ret);
+ return -EIO;
+ }
+ for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
+ write_timeout -= 5) {
+ ret = dev->em28xx_read_reg(dev, 0x05);
+ if (ret == 0x80 + len - 1)
+ return len;
+ mdelay(5);
+ }
+ em28xx_warn("i2c write timed out\n");
+ return -EIO;
+}
+
+/*
+ * em2800_i2c_send_bytes()
+ */
+static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf,
+ short len)
+{
+ char *bufPtr = buf;
+ int ret;
+ int wrcount = 0;
+ int count;
+ int maxLen = 4;
+ struct em28xx *dev = (struct em28xx *)data;
+ while (len > 0) {
+ count = (len > maxLen) ? maxLen : len;
+ ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
+ if (ret > 0) {
+ len -= count;
+ bufPtr += count;
+ wrcount += count;
+ } else
+ return (ret < 0) ? ret : -EFAULT;
+ }
+ return wrcount;
+}
+
+/*
+ * em2800_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
+{
+ char msg;
+ int ret;
+ int write_timeout;
+ msg = addr;
+ ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
+ if (ret < 0) {
+ em28xx_warn("setting i2c device address failed (error=%i)\n",
+ ret);
+ return ret;
+ }
+ msg = 0x84;
+ ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
+ if (ret < 0) {
+ em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
+ return ret;
+ }
+ for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
+ write_timeout -= 5) {
+ unsigned msg = dev->em28xx_read_reg(dev, 0x5);
+ if (msg == 0x94)
+ return -ENODEV;
+ else if (msg == 0x84)
+ return 0;
+ mdelay(5);
+ }
+ return -ENODEV;
+}
+
+/*
+ * em2800_i2c_recv_bytes()
+ * read from the i2c device
+ */
+static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
+ char *buf, int len)
+{
+ int ret;
+ /* check for the device and set i2c read address */
+ ret = em2800_i2c_check_for_device(dev, addr);
+ if (ret) {
+ em28xx_warn
+ ("preparing read at i2c address 0x%x failed (error=%i)\n",
+ addr, ret);
+ return ret;
+ }
+ ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
+ if (ret < 0) {
+ em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
+ addr, ret);
+ return ret;
+ }
+ return ret;
+}
+
+/*
+ * em28xx_i2c_send_bytes()
+ * untested for more than 4 bytes
+ */
+static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf,
+ short len, int stop)
+{
+ int wrcount = 0;
+ struct em28xx *dev = (struct em28xx *)data;
+
+ wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
+
+ return wrcount;
+}
+
+/*
+ * em28xx_i2c_recv_bytes()
+ * read a byte from the i2c device
+ */
+static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
+ char *buf, int len)
+{
+ int ret;
+ ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
+ if (ret < 0) {
+ em28xx_warn("reading i2c device failed (error=%i)\n", ret);
+ return ret;
+ }
+ if (dev->em28xx_read_reg(dev, 0x5) != 0)
+ return -ENODEV;
+ return ret;
+}
+
+/*
+ * em28xx_i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
+{
+ char msg;
+ int ret;
+ msg = addr;
+
+ ret = dev->em28xx_read_reg_req(dev, 2, addr);
+ if (ret < 0) {
+ em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
+ return ret;
+ }
+ if (dev->em28xx_read_reg(dev, 0x5) != 0)
+ return -ENODEV;
+ return 0;
+}
+
+/*
+ * em28xx_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct em28xx *dev = i2c_adap->algo_data;
+ int addr, rc, i, byte;
+
+ if (num <= 0)
+ return 0;
+ for (i = 0; i < num; i++) {
+ addr = msgs[i].addr << 1;
+ dprintk2(2,"%s %s addr=%x len=%d:",
+ (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+ i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+ if (!msgs[i].len) { /* no len: check only for device presence */
+ if (dev->is_em2800)
+ rc = em2800_i2c_check_for_device(dev, addr);
+ else
+ rc = em28xx_i2c_check_for_device(dev, addr);
+ if (rc < 0) {
+ dprintk2(2," no device\n");
+ return rc;
+ }
+
+ } else if (msgs[i].flags & I2C_M_RD) {
+ /* read bytes */
+ if (dev->is_em2800)
+ rc = em2800_i2c_recv_bytes(dev, addr,
+ msgs[i].buf,
+ msgs[i].len);
+ else
+ rc = em28xx_i2c_recv_bytes(dev, addr,
+ msgs[i].buf,
+ msgs[i].len);
+ if (i2c_debug>=2) {
+ for (byte = 0; byte < msgs[i].len; byte++) {
+ printk(" %02x", msgs[i].buf[byte]);
+ }
+ }
+ } else {
+ /* write bytes */
+ if (i2c_debug>=2) {
+ for (byte = 0; byte < msgs[i].len; byte++)
+ printk(" %02x", msgs[i].buf[byte]);
+ }
+ if (dev->is_em2800)
+ rc = em2800_i2c_send_bytes(dev, addr,
+ msgs[i].buf,
+ msgs[i].len);
+ else
+ rc = em28xx_i2c_send_bytes(dev, addr,
+ msgs[i].buf,
+ msgs[i].len,
+ i == num - 1);
+ if (rc < 0)
+ goto err;
+ }
+ if (i2c_debug>=2)
+ printk("\n");
+ }
+
+ return num;
+ err:
+ dprintk2(2," ERROR: %i\n", rc);
+ return rc;
+}
+
+static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
+{
+ unsigned char buf, *p = eedata;
+ struct em28xx_eeprom *em_eeprom = (void *)eedata;
+ int i, err, size = len, block;
+
+ dev->i2c_client.addr = 0xa0 >> 1;
+
+ /* Check if board has eeprom */
+ err = i2c_master_recv(&dev->i2c_client, &buf, 0);
+ if (err < 0)
+ return -1;
+
+ buf = 0;
+ if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
+ printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
+ dev->name, err);
+ return -1;
+ }
+ while (size > 0) {
+ if (size > 16)
+ block = 16;
+ else
+ block = size;
+
+ if (block !=
+ (err = i2c_master_recv(&dev->i2c_client, p, block))) {
+ printk(KERN_WARNING
+ "%s: i2c eeprom read error (err=%d)\n",
+ dev->name, err);
+ return -1;
+ }
+ size -= block;
+ p += block;
+ }
+ for (i = 0; i < len; i++) {
+ if (0 == (i % 16))
+ printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
+ printk(" %02x", eedata[i]);
+ if (15 == (i % 16))
+ printk("\n");
+ }
+
+ printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
+ printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
+ em_eeprom->product_ID);
+
+ switch (em_eeprom->chip_conf >> 4 & 0x3) {
+ case 0:
+ printk(KERN_INFO "No audio on board.\n");
+ break;
+ case 1:
+ printk(KERN_INFO "AC97 audio (5 sample rates)\n");
+ break;
+ case 2:
+ printk(KERN_INFO "I2S audio, sample rate=32k\n");
+ break;
+ case 3:
+ printk(KERN_INFO "I2S audio, 3 sample rates\n");
+ break;
+ }
+
+ if (em_eeprom->chip_conf & 1 << 3)
+ printk(KERN_INFO "USB Remote wakeup capable\n");
+
+ if (em_eeprom->chip_conf & 1 << 2)
+ printk(KERN_INFO "USB Self power capable\n");
+
+ switch (em_eeprom->chip_conf & 0x3) {
+ case 0:
+ printk(KERN_INFO "500mA max power\n");
+ break;
+ case 1:
+ printk(KERN_INFO "400mA max power\n");
+ break;
+ case 2:
+ printk(KERN_INFO "300mA max power\n");
+ break;
+ case 3:
+ printk(KERN_INFO "200mA max power\n");
+ break;
+ }
+ printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
+ em_eeprom->string_idx_table,em_eeprom->string1,
+ em_eeprom->string2,em_eeprom->string3);
+
+ return 0;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * algo_control()
+ */
+static int algo_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+#ifndef I2C_PEC
+static void inc_use(struct i2c_adapter *adap)
+{
+ MOD_INC_USE_COUNT;
+}
+
+static void dec_use(struct i2c_adapter *adap)
+{
+ MOD_DEC_USE_COUNT;
+}
+#endif
+
+static int em28xx_set_tuner(int check_eeprom, struct i2c_client *client)
+{
+ struct em28xx *dev = client->adapter->algo_data;
+ struct tuner_setup tun_setup;
+
+ if (dev->has_tuner) {
+ tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+ tun_setup.type = dev->tuner_type;
+ tun_setup.addr = dev->tuner_addr;
+
+ em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
+ }
+
+ return (0);
+}
+
+/*
+ * attach_inform()
+ * gets called when a device attaches to the i2c bus
+ * does some basic configuration
+ */
+static int attach_inform(struct i2c_client *client)
+{
+ struct em28xx *dev = client->adapter->algo_data;
+
+ switch (client->addr << 1) {
+ case 0x86:
+ em28xx_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
+ break;
+ case 0x42:
+ dprintk1(1,"attach_inform: saa7114 detected.\n");
+ break;
+ case 0x4a:
+ dprintk1(1,"attach_inform: saa7113 detected.\n");
+ break;
+ case 0xa0:
+ dprintk1(1,"attach_inform: eeprom detected.\n");
+ break;
+ case 0x60:
+ case 0x8e:
+ {
+ struct IR_i2c *ir = i2c_get_clientdata(client);
+ dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
+ em28xx_set_ir(dev,ir);
+ break;
+ }
+ case 0x80:
+ case 0x88:
+ dprintk1(1,"attach_inform: msp34xx detected.\n");
+ break;
+ case 0xb8:
+ case 0xba:
+ dprintk1(1,"attach_inform: tvp5150 detected.\n");
+ break;
+ default:
+ dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1);
+ dev->tuner_addr = client->addr;
+ em28xx_set_tuner(-1, client);
+ }
+
+ return 0;
+}
+
+static struct i2c_algorithm em28xx_algo = {
+ .master_xfer = em28xx_i2c_xfer,
+ .algo_control = algo_control,
+ .functionality = functionality,
+};
+
+static struct i2c_adapter em28xx_adap_template = {
+#ifdef I2C_PEC
+ .owner = THIS_MODULE,
+#else
+ .inc_use = inc_use,
+ .dec_use = dec_use,
+#endif
+#ifdef I2C_CLASS_TV_ANALOG
+ .class = I2C_CLASS_TV_ANALOG,
+#endif
+ .name = "em28xx",
+ .id = I2C_HW_B_EM28XX,
+ .algo = &em28xx_algo,
+ .client_register = attach_inform,
+};
+
+static struct i2c_client em28xx_client_template = {
+ .name = "em28xx internal",
+ .flags = I2C_CLIENT_ALLOW_USE,
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static char *i2c_devs[128] = {
+ [0x4a >> 1] = "saa7113h",
+ [0x60 >> 1] = "remote IR sensor",
+ [0x8e >> 1] = "remote IR sensor",
+ [0x86 >> 1] = "tda9887",
+ [0x80 >> 1] = "msp34xx",
+ [0x88 >> 1] = "msp34xx",
+ [0xa0 >> 1] = "eeprom",
+ [0xb8 >> 1] = "tvp5150a",
+ [0xba >> 1] = "tvp5150a",
+ [0xc0 >> 1] = "tuner (analog)",
+ [0xc2 >> 1] = "tuner (analog)",
+ [0xc4 >> 1] = "tuner (analog)",
+ [0xc6 >> 1] = "tuner (analog)",
+};
+
+/*
+ * do_i2c_scan()
+ * check i2c address range for devices
+ */
+static void do_i2c_scan(char *name, struct i2c_client *c)
+{
+ unsigned char buf;
+ int i, rc;
+
+ for (i = 0; i < 128; i++) {
+ c->addr = i;
+ rc = i2c_master_recv(c, &buf, 0);
+ if (rc < 0)
+ continue;
+ printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", name,
+ i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+ }
+}
+
+/*
+ * em28xx_i2c_call_clients()
+ * send commands to all attached i2c devices
+ */
+void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg)
+{
+ BUG_ON(NULL == dev->i2c_adap.algo_data);
+ i2c_clients_command(&dev->i2c_adap, cmd, arg);
+}
+
+/*
+ * em28xx_i2c_register()
+ * register i2c bus
+ */
+int em28xx_i2c_register(struct em28xx *dev)
+{
+ BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
+ BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
+ dev->i2c_adap = em28xx_adap_template;
+ dev->i2c_adap.dev.parent = &dev->udev->dev;
+ strcpy(dev->i2c_adap.name, dev->name);
+ dev->i2c_adap.algo_data = dev;
+ i2c_add_adapter(&dev->i2c_adap);
+
+ dev->i2c_client = em28xx_client_template;
+ dev->i2c_client.adapter = &dev->i2c_adap;
+
+ em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
+
+ if (i2c_scan)
+ do_i2c_scan(dev->name, &dev->i2c_client);
+ return 0;
+}
+
+/*
+ * em28xx_i2c_unregister()
+ * unregister i2c_bus
+ */
+int em28xx_i2c_unregister(struct em28xx *dev)
+{
+ i2c_del_adapter(&dev->i2c_adap);
+ return 0;
+}
generated by cgit v1.1 at 2024-12-27 04:06:26 +0000