summaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/saa7134/saa7134-i2c.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/pci/saa7134/saa7134-i2c.c')
-rw-r--r--drivers/media/pci/saa7134/saa7134-i2c.c435
1 files changed, 435 insertions, 0 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-i2c.c b/drivers/media/pci/saa7134/saa7134-i2c.c
new file mode 100644
index 000000000000..a176ec3285e0
--- /dev/null
+++ b/drivers/media/pci/saa7134/saa7134-i2c.c
@@ -0,0 +1,435 @@
+/*
+ *
+ * device driver for philips saa7134 based TV cards
+ * i2c interface support
+ *
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ *
+ * 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/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+
+#include "saa7134-reg.h"
+#include "saa7134.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");
+
+#define d1printk if (1 == i2c_debug) printk
+#define d2printk if (2 == i2c_debug) printk
+
+#define I2C_WAIT_DELAY 32
+#define I2C_WAIT_RETRY 16
+
+/* ----------------------------------------------------------- */
+
+static char *str_i2c_status[] = {
+ "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
+ "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
+ "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
+};
+
+enum i2c_status {
+ IDLE = 0, // no I2C command pending
+ DONE_STOP = 1, // I2C command done and STOP executed
+ BUSY = 2, // executing I2C command
+ TO_SCL = 3, // executing I2C command, time out on clock stretching
+ TO_ARB = 4, // time out on arbitration trial, still trying
+ DONE_WRITE = 5, // I2C command done and awaiting next write command
+ DONE_READ = 6, // I2C command done and awaiting next read command
+ DONE_WRITE_TO = 7, // see 5, and time out on status echo
+ DONE_READ_TO = 8, // see 6, and time out on status echo
+ NO_DEVICE = 9, // no acknowledge on device slave address
+ NO_ACKN = 10, // no acknowledge after data byte transfer
+ BUS_ERR = 11, // bus error
+ ARB_LOST = 12, // arbitration lost during transfer
+ SEQ_ERR = 13, // erroneous programming sequence
+ ST_ERR = 14, // wrong status echoing
+ SW_ERR = 15 // software error
+};
+
+static char *str_i2c_attr[] = {
+ "NOP", "STOP", "CONTINUE", "START"
+};
+
+enum i2c_attr {
+ NOP = 0, // no operation on I2C bus
+ STOP = 1, // stop condition, no associated byte transfer
+ CONTINUE = 2, // continue with byte transfer
+ START = 3 // start condition with byte transfer
+};
+
+static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
+{
+ enum i2c_status status;
+
+ status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
+ d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
+ str_i2c_status[status]);
+ return status;
+}
+
+static inline void i2c_set_status(struct saa7134_dev *dev,
+ enum i2c_status status)
+{
+ d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
+ str_i2c_status[status]);
+ saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
+}
+
+static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
+{
+ d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
+ str_i2c_attr[attr]);
+ saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
+}
+
+static inline int i2c_is_error(enum i2c_status status)
+{
+ switch (status) {
+ case NO_DEVICE:
+ case NO_ACKN:
+ case BUS_ERR:
+ case ARB_LOST:
+ case SEQ_ERR:
+ case ST_ERR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static inline int i2c_is_idle(enum i2c_status status)
+{
+ switch (status) {
+ case IDLE:
+ case DONE_STOP:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static inline int i2c_is_busy(enum i2c_status status)
+{
+ switch (status) {
+ case BUSY:
+ case TO_SCL:
+ case TO_ARB:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static int i2c_is_busy_wait(struct saa7134_dev *dev)
+{
+ enum i2c_status status;
+ int count;
+
+ for (count = 0; count < I2C_WAIT_RETRY; count++) {
+ status = i2c_get_status(dev);
+ if (!i2c_is_busy(status))
+ break;
+ saa_wait(I2C_WAIT_DELAY);
+ }
+ if (I2C_WAIT_RETRY == count)
+ return false;
+ return true;
+}
+
+static int i2c_reset(struct saa7134_dev *dev)
+{
+ enum i2c_status status;
+ int count;
+
+ d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
+ status = i2c_get_status(dev);
+ if (!i2c_is_error(status))
+ return true;
+ i2c_set_status(dev,status);
+
+ for (count = 0; count < I2C_WAIT_RETRY; count++) {
+ status = i2c_get_status(dev);
+ if (!i2c_is_error(status))
+ break;
+ udelay(I2C_WAIT_DELAY);
+ }
+ if (I2C_WAIT_RETRY == count)
+ return false;
+
+ if (!i2c_is_idle(status))
+ return false;
+
+ i2c_set_attr(dev,NOP);
+ return true;
+}
+
+static inline int i2c_send_byte(struct saa7134_dev *dev,
+ enum i2c_attr attr,
+ unsigned char data)
+{
+ enum i2c_status status;
+ __u32 dword;
+
+ /* have to write both attr + data in one 32bit word */
+ dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
+ dword &= 0x0f;
+ dword |= (attr << 6);
+ dword |= ((__u32)data << 8);
+ dword |= 0x00 << 16; /* 100 kHz */
+// dword |= 0x40 << 16; /* 400 kHz */
+ dword |= 0xf0 << 24;
+ saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
+ d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);
+
+ if (!i2c_is_busy_wait(dev))
+ return -EIO;
+ status = i2c_get_status(dev);
+ if (i2c_is_error(status))
+ return -EIO;
+ return 0;
+}
+
+static inline int i2c_recv_byte(struct saa7134_dev *dev)
+{
+ enum i2c_status status;
+ unsigned char data;
+
+ i2c_set_attr(dev,CONTINUE);
+ if (!i2c_is_busy_wait(dev))
+ return -EIO;
+ status = i2c_get_status(dev);
+ if (i2c_is_error(status))
+ return -EIO;
+ data = saa_readb(SAA7134_I2C_DATA);
+ d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
+ return data;
+}
+
+static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct saa7134_dev *dev = i2c_adap->algo_data;
+ enum i2c_status status;
+ unsigned char data;
+ int addr,rc,i,byte;
+
+ status = i2c_get_status(dev);
+ if (!i2c_is_idle(status))
+ if (!i2c_reset(dev))
+ return -EIO;
+
+ d2printk("start xfer\n");
+ d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
+ for (i = 0; i < num; i++) {
+ if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
+ /* send address */
+ d2printk("send address\n");
+ addr = msgs[i].addr << 1;
+ if (msgs[i].flags & I2C_M_RD)
+ addr |= 1;
+ if (i > 0 && msgs[i].flags &
+ I2C_M_RD && msgs[i].addr != 0x40 &&
+ msgs[i].addr != 0x19) {
+ /* workaround for a saa7134 i2c bug
+ * needed to talk to the mt352 demux
+ * thanks to pinnacle for the hint */
+ int quirk = 0xfe;
+ d1printk(" [%02x quirk]",quirk);
+ i2c_send_byte(dev,START,quirk);
+ i2c_recv_byte(dev);
+ }
+ d1printk(" < %02x", addr);
+ rc = i2c_send_byte(dev,START,addr);
+ if (rc < 0)
+ goto err;
+ }
+ if (msgs[i].flags & I2C_M_RD) {
+ /* read bytes */
+ d2printk("read bytes\n");
+ for (byte = 0; byte < msgs[i].len; byte++) {
+ d1printk(" =");
+ rc = i2c_recv_byte(dev);
+ if (rc < 0)
+ goto err;
+ d1printk("%02x", rc);
+ msgs[i].buf[byte] = rc;
+ }
+ /* discard mysterious extra byte when reading
+ from Samsung S5H1411. i2c bus gets error
+ if we do not. */
+ if (0x19 == msgs[i].addr) {
+ d1printk(" ?");
+ rc = i2c_recv_byte(dev);
+ if (rc < 0)
+ goto err;
+ d1printk("%02x", rc);
+ }
+ } else {
+ /* write bytes */
+ d2printk("write bytes\n");
+ for (byte = 0; byte < msgs[i].len; byte++) {
+ data = msgs[i].buf[byte];
+ d1printk(" %02x", data);
+ rc = i2c_send_byte(dev,CONTINUE,data);
+ if (rc < 0)
+ goto err;
+ }
+ }
+ }
+ d2printk("xfer done\n");
+ d1printk(" >");
+ i2c_set_attr(dev,STOP);
+ rc = -EIO;
+ if (!i2c_is_busy_wait(dev))
+ goto err;
+ status = i2c_get_status(dev);
+ if (i2c_is_error(status))
+ goto err;
+ /* ensure that the bus is idle for at least one bit slot */
+ msleep(1);
+
+ d1printk("\n");
+ return num;
+ err:
+ if (1 == i2c_debug) {
+ status = i2c_get_status(dev);
+ printk(" ERROR: %s\n",str_i2c_status[status]);
+ }
+ return rc;
+}
+
+/* ----------------------------------------------------------- */
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm saa7134_algo = {
+ .master_xfer = saa7134_i2c_xfer,
+ .functionality = functionality,
+};
+
+static struct i2c_adapter saa7134_adap_template = {
+ .owner = THIS_MODULE,
+ .name = "saa7134",
+ .algo = &saa7134_algo,
+};
+
+static struct i2c_client saa7134_client_template = {
+ .name = "saa7134 internal",
+};
+
+/* ----------------------------------------------------------- */
+
+static int
+saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
+{
+ unsigned char buf;
+ int i,err;
+
+ dev->i2c_client.addr = 0xa0 >> 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;
+ }
+ if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
+ 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(" %02x",eedata[i]);
+ if (15 == (i % 16))
+ printk("\n");
+ }
+ return 0;
+}
+
+static char *i2c_devs[128] = {
+ [ 0x20 ] = "mpeg encoder (saa6752hs)",
+ [ 0xa0 >> 1 ] = "eeprom",
+ [ 0xc0 >> 1 ] = "tuner (analog)",
+ [ 0x86 >> 1 ] = "tda9887",
+ [ 0x5a >> 1 ] = "remote control",
+};
+
+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,0);
+ if (rc < 0)
+ continue;
+ printk("%s: i2c scan: found device @ 0x%x [%s]\n",
+ name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+ }
+}
+
+int saa7134_i2c_register(struct saa7134_dev *dev)
+{
+ dev->i2c_adap = saa7134_adap_template;
+ dev->i2c_adap.dev.parent = &dev->pci->dev;
+ strcpy(dev->i2c_adap.name,dev->name);
+ dev->i2c_adap.algo_data = dev;
+ i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+ i2c_add_adapter(&dev->i2c_adap);
+
+ dev->i2c_client = saa7134_client_template;
+ dev->i2c_client.adapter = &dev->i2c_adap;
+
+ saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
+ if (i2c_scan)
+ do_i2c_scan(dev->name,&dev->i2c_client);
+
+ /* Instantiate the IR receiver device, if present */
+ saa7134_probe_i2c_ir(dev);
+ return 0;
+}
+
+int saa7134_i2c_unregister(struct saa7134_dev *dev)
+{
+ i2c_del_adapter(&dev->i2c_adap);
+ return 0;
+}
+
+/* ----------------------------------------------------------- */
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 02:08:11 +0100