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path: root/drivers/media/usb/em28xx/em28xx-i2c.c
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Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-i2c.c')
-rw-r--r--drivers/media/usb/em28xx/em28xx-i2c.c1029
1 files changed, 1029 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
new file mode 100644
index 000000000..a7eb11f7f
--- /dev/null
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -0,0 +1,1029 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// 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@kernel.org>
+// Sascha Sommer <saschasommer@freenet.de>
+// Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
+
+#include "em28xx.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+
+#include "xc2028.h"
+#include <media/v4l2-common.h>
+#include <media/tuner.h>
+
+/* ----------------------------------------------------------- */
+
+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_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
+
+#define dprintk(level, fmt, arg...) do { \
+ if (i2c_debug > level) \
+ dev_printk(KERN_DEBUG, &dev->intf->dev, \
+ "i2c: %s: " fmt, __func__, ## arg); \
+} while (0)
+
+/*
+ * Time in msecs to wait for i2c xfers to finish.
+ * 35ms is the maximum time a SMBUS device could wait when
+ * clock stretching is used. As the transfer itself will take
+ * some time to happen, set it to 35 ms.
+ *
+ * Ok, I2C doesn't specify any limit. So, eventually, we may need
+ * to increase this timeout.
+ */
+#define EM28XX_I2C_XFER_TIMEOUT 35 /* ms */
+
+static int em28xx_i2c_timeout(struct em28xx *dev)
+{
+ int time = EM28XX_I2C_XFER_TIMEOUT;
+
+ switch (dev->i2c_speed & 0x03) {
+ case EM28XX_I2C_FREQ_25_KHZ:
+ time += 4; /* Assume 4 ms for transfers */
+ break;
+ case EM28XX_I2C_FREQ_100_KHZ:
+ case EM28XX_I2C_FREQ_400_KHZ:
+ time += 1; /* Assume 1 ms for transfers */
+ break;
+ default: /* EM28XX_I2C_FREQ_1_5_MHZ */
+ break;
+ }
+
+ return msecs_to_jiffies(time);
+}
+
+/*
+ * em2800_i2c_send_bytes()
+ * send up to 4 bytes to the em2800 i2c device
+ */
+static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
+{
+ unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
+ int ret;
+ u8 b2[6];
+
+ if (len < 1 || len > 4)
+ return -EOPNOTSUPP;
+
+ 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];
+
+ /* trigger write */
+ ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
+ if (ret != 2 + len) {
+ dev_warn(&dev->intf->dev,
+ "failed to trigger write to i2c address 0x%x (error=%i)\n",
+ addr, ret);
+ return (ret < 0) ? ret : -EIO;
+ }
+ /* wait for completion */
+ while (time_is_after_jiffies(timeout)) {
+ ret = dev->em28xx_read_reg(dev, 0x05);
+ if (ret == 0x80 + len - 1)
+ return len;
+ if (ret == 0x94 + len - 1) {
+ dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret);
+ return -ENXIO;
+ }
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "failed to get i2c transfer status from bridge register (error=%i)\n",
+ ret);
+ return ret;
+ }
+ usleep_range(5000, 6000);
+ }
+ dprintk(0, "write to i2c device at 0x%x timed out\n", addr);
+ return -ETIMEDOUT;
+}
+
+/*
+ * em2800_i2c_recv_bytes()
+ * read up to 4 bytes from the em2800 i2c device
+ */
+static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
+{
+ unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
+ u8 buf2[4];
+ int ret;
+ int i;
+
+ if (len < 1 || len > 4)
+ return -EOPNOTSUPP;
+
+ /* trigger read */
+ buf2[1] = 0x84 + len - 1;
+ buf2[0] = addr;
+ ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
+ if (ret != 2) {
+ dev_warn(&dev->intf->dev,
+ "failed to trigger read from i2c address 0x%x (error=%i)\n",
+ addr, ret);
+ return (ret < 0) ? ret : -EIO;
+ }
+
+ /* wait for completion */
+ while (time_is_after_jiffies(timeout)) {
+ ret = dev->em28xx_read_reg(dev, 0x05);
+ if (ret == 0x84 + len - 1)
+ break;
+ if (ret == 0x94 + len - 1) {
+ dprintk(1, "R05 returned 0x%02x: I2C ACK error\n",
+ ret);
+ return -ENXIO;
+ }
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "failed to get i2c transfer status from bridge register (error=%i)\n",
+ ret);
+ return ret;
+ }
+ usleep_range(5000, 6000);
+ }
+ if (ret != 0x84 + len - 1)
+ dprintk(0, "read from i2c device at 0x%x timed out\n", addr);
+
+ /* get the received message */
+ ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4 - len, buf2, len);
+ if (ret != len) {
+ dev_warn(&dev->intf->dev,
+ "reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
+ addr, ret);
+ return (ret < 0) ? ret : -EIO;
+ }
+ for (i = 0; i < len; i++)
+ buf[i] = buf2[len - 1 - i];
+
+ return ret;
+}
+
+/*
+ * em2800_i2c_check_for_device()
+ * check if there is an i2c device at the supplied address
+ */
+static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
+{
+ u8 buf;
+ int ret;
+
+ ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
+ if (ret == 1)
+ return 0;
+ return (ret < 0) ? ret : -EIO;
+}
+
+/*
+ * em28xx_i2c_send_bytes()
+ */
+static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
+ u16 len, int stop)
+{
+ unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
+ int ret;
+
+ if (len < 1 || len > 64)
+ return -EOPNOTSUPP;
+ /*
+ * NOTE: limited by the USB ctrl message constraints
+ * Zero length reads always succeed, even if no device is connected
+ */
+
+ /* Write to i2c device */
+ ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
+ if (ret != len) {
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "writing to i2c device at 0x%x failed (error=%i)\n",
+ addr, ret);
+ return ret;
+ }
+ dev_warn(&dev->intf->dev,
+ "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
+ len, addr, ret);
+ return -EIO;
+ }
+
+ /* wait for completion */
+ while (time_is_after_jiffies(timeout)) {
+ ret = dev->em28xx_read_reg(dev, 0x05);
+ if (ret == 0) /* success */
+ return len;
+ if (ret == 0x10) {
+ dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
+ addr);
+ return -ENXIO;
+ }
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "failed to get i2c transfer status from bridge register (error=%i)\n",
+ ret);
+ return ret;
+ }
+ usleep_range(5000, 6000);
+ /*
+ * NOTE: do we really have to wait for success ?
+ * Never seen anything else than 0x00 or 0x10
+ * (even with high payload) ...
+ */
+ }
+
+ if (ret == 0x02 || ret == 0x04) {
+ /* NOTE: these errors seem to be related to clock stretching */
+ dprintk(0,
+ "write to i2c device at 0x%x timed out (status=%i)\n",
+ addr, ret);
+ return -ETIMEDOUT;
+ }
+
+ dev_warn(&dev->intf->dev,
+ "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
+ addr, ret);
+ return -EIO;
+}
+
+/*
+ * em28xx_i2c_recv_bytes()
+ * read a byte from the i2c device
+ */
+static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
+{
+ int ret;
+
+ if (len < 1 || len > 64)
+ return -EOPNOTSUPP;
+ /*
+ * NOTE: limited by the USB ctrl message constraints
+ * Zero length reads always succeed, even if no device is connected
+ */
+
+ /* Read data from i2c device */
+ ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "reading from i2c device at 0x%x failed (error=%i)\n",
+ addr, ret);
+ return ret;
+ } else if (ret != len) {
+ dev_dbg(&dev->intf->dev,
+ "%i bytes read from i2c device at 0x%x requested, but %i bytes written\n",
+ ret, addr, len);
+ }
+ /*
+ * NOTE: some devices with two i2c buses have the bad habit to return 0
+ * bytes if we are on bus B AND there was no write attempt to the
+ * specified slave address before AND no device is present at the
+ * requested slave address.
+ * Anyway, the next check will fail with -ENXIO in this case, so avoid
+ * spamming the system log on device probing and do nothing here.
+ */
+
+ /* Check success of the i2c operation */
+ ret = dev->em28xx_read_reg(dev, 0x05);
+ if (ret == 0) /* success */
+ return len;
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "failed to get i2c transfer status from bridge register (error=%i)\n",
+ ret);
+ return ret;
+ }
+ if (ret == 0x10) {
+ dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
+ addr);
+ return -ENXIO;
+ }
+
+ if (ret == 0x02 || ret == 0x04) {
+ /* NOTE: these errors seem to be related to clock stretching */
+ dprintk(0,
+ "write to i2c device at 0x%x timed out (status=%i)\n",
+ addr, ret);
+ return -ETIMEDOUT;
+ }
+
+ dev_warn(&dev->intf->dev,
+ "read from i2c device at 0x%x failed with unknown error (status=%i)\n",
+ addr, ret);
+ return -EIO;
+}
+
+/*
+ * 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, u16 addr)
+{
+ int ret;
+ u8 buf;
+
+ ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
+ if (ret == 1)
+ return 0;
+ return (ret < 0) ? ret : -EIO;
+}
+
+/*
+ * em25xx_bus_B_send_bytes
+ * write bytes to the i2c device
+ */
+static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
+ u16 len)
+{
+ int ret;
+
+ if (len < 1 || len > 64)
+ return -EOPNOTSUPP;
+ /*
+ * NOTE: limited by the USB ctrl message constraints
+ * Zero length reads always succeed, even if no device is connected
+ */
+
+ /* Set register and write value */
+ ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
+ if (ret != len) {
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "writing to i2c device at 0x%x failed (error=%i)\n",
+ addr, ret);
+ return ret;
+ }
+
+ dev_warn(&dev->intf->dev,
+ "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
+ len, addr, ret);
+ return -EIO;
+ }
+ /* Check success */
+ ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
+ /*
+ * NOTE: the only error we've seen so far is
+ * 0x01 when the slave device is not present
+ */
+ if (!ret)
+ return len;
+
+ if (ret > 0) {
+ dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
+ return -ENXIO;
+ }
+
+ return ret;
+ /*
+ * NOTE: With chip types (other chip IDs) which actually don't support
+ * this operation, it seems to succeed ALWAYS ! (even if there is no
+ * slave device or even no second i2c bus provided)
+ */
+}
+
+/*
+ * em25xx_bus_B_recv_bytes
+ * read bytes from the i2c device
+ */
+static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
+ u16 len)
+{
+ int ret;
+
+ if (len < 1 || len > 64)
+ return -EOPNOTSUPP;
+ /*
+ * NOTE: limited by the USB ctrl message constraints
+ * Zero length reads always succeed, even if no device is connected
+ */
+
+ /* Read value */
+ ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
+ if (ret < 0) {
+ dev_warn(&dev->intf->dev,
+ "reading from i2c device at 0x%x failed (error=%i)\n",
+ addr, ret);
+ return ret;
+ }
+ /*
+ * NOTE: some devices with two i2c buses have the bad habit to return 0
+ * bytes if we are on bus B AND there was no write attempt to the
+ * specified slave address before AND no device is present at the
+ * requested slave address.
+ * Anyway, the next check will fail with -ENXIO in this case, so avoid
+ * spamming the system log on device probing and do nothing here.
+ */
+
+ /* Check success */
+ ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
+ /*
+ * NOTE: the only error we've seen so far is
+ * 0x01 when the slave device is not present
+ */
+ if (!ret)
+ return len;
+
+ if (ret > 0) {
+ dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
+ return -ENXIO;
+ }
+
+ return ret;
+ /*
+ * NOTE: With chip types (other chip IDs) which actually don't support
+ * this operation, it seems to succeed ALWAYS ! (even if there is no
+ * slave device or even no second i2c bus provided)
+ */
+}
+
+/*
+ * em25xx_bus_B_check_for_device()
+ * check if there is a i2c device at the supplied address
+ */
+static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
+{
+ u8 buf;
+ int ret;
+
+ ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+ /*
+ * NOTE: With chips which do not support this operation,
+ * it seems to succeed ALWAYS ! (even if no device connected)
+ */
+}
+
+static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
+{
+ struct em28xx *dev = i2c_bus->dev;
+ int rc = -EOPNOTSUPP;
+
+ if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
+ rc = em28xx_i2c_check_for_device(dev, addr);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
+ rc = em2800_i2c_check_for_device(dev, addr);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
+ rc = em25xx_bus_B_check_for_device(dev, addr);
+ return rc;
+}
+
+static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
+ struct i2c_msg msg)
+{
+ struct em28xx *dev = i2c_bus->dev;
+ u16 addr = msg.addr << 1;
+ int rc = -EOPNOTSUPP;
+
+ if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
+ rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
+ rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
+ rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
+ return rc;
+}
+
+static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
+ struct i2c_msg msg, int stop)
+{
+ struct em28xx *dev = i2c_bus->dev;
+ u16 addr = msg.addr << 1;
+ int rc = -EOPNOTSUPP;
+
+ if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
+ rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
+ rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
+ else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
+ rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
+ return rc;
+}
+
+/*
+ * 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_i2c_bus *i2c_bus = i2c_adap->algo_data;
+ struct em28xx *dev = i2c_bus->dev;
+ unsigned int bus = i2c_bus->bus;
+ int addr, rc, i;
+ u8 reg;
+
+ /*
+ * prevent i2c xfer attempts after device is disconnected
+ * some fe's try to do i2c writes/reads from their release
+ * interfaces when called in disconnect path
+ */
+ if (dev->disconnected)
+ return -ENODEV;
+
+ if (!rt_mutex_trylock(&dev->i2c_bus_lock))
+ return -EAGAIN;
+
+ /* Switch I2C bus if needed */
+ if (bus != dev->cur_i2c_bus &&
+ i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
+ if (bus == 1)
+ reg = EM2874_I2C_SECONDARY_BUS_SELECT;
+ else
+ reg = 0;
+ em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
+ EM2874_I2C_SECONDARY_BUS_SELECT);
+ dev->cur_i2c_bus = bus;
+ }
+
+ for (i = 0; i < num; i++) {
+ addr = msgs[i].addr << 1;
+ if (!msgs[i].len) {
+ /*
+ * no len: check only for device presence
+ * This code is only called during device probe.
+ */
+ rc = i2c_check_for_device(i2c_bus, addr);
+
+ if (rc == -ENXIO)
+ rc = -ENODEV;
+ } else if (msgs[i].flags & I2C_M_RD) {
+ /* read bytes */
+ rc = i2c_recv_bytes(i2c_bus, msgs[i]);
+ } else {
+ /* write bytes */
+ rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
+ }
+
+ if (rc < 0)
+ goto error;
+
+ dprintk(2, "%s %s addr=%02x len=%d: %*ph\n",
+ (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+ i == num - 1 ? "stop" : "nonstop",
+ addr, msgs[i].len,
+ msgs[i].len, msgs[i].buf);
+ }
+
+ rt_mutex_unlock(&dev->i2c_bus_lock);
+ return num;
+
+error:
+ dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n",
+ (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+ i == num - 1 ? "stop" : "nonstop",
+ addr, msgs[i].len,
+ (rc == -ENODEV) ? "no device " : "",
+ rc);
+
+ rt_mutex_unlock(&dev->i2c_bus_lock);
+ return rc;
+}
+
+/*
+ * based on linux/sunrpc/svcauth.h and linux/hash.h
+ * The original hash function returns a different value, if arch is x86_64
+ * or i386.
+ */
+static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
+{
+ unsigned long hash = 0;
+ unsigned long l = 0;
+ int len = 0;
+ unsigned char c;
+
+ do {
+ if (len == length) {
+ c = (char)len;
+ len = -1;
+ } else {
+ c = *buf++;
+ }
+ l = (l << 8) | c;
+ len++;
+ if ((len & (32 / 8 - 1)) == 0)
+ hash = ((hash ^ l) * 0x9e370001UL);
+ } while (len);
+
+ return (hash >> (32 - bits)) & 0xffffffffUL;
+}
+
+/*
+ * Helper function to read data blocks from i2c clients with 8 or 16 bit
+ * address width, 8 bit register width and auto incrementation been activated
+ */
+static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr,
+ bool addr_w16, u16 len, u8 *data)
+{
+ int remain = len, rsize, rsize_max, ret;
+ u8 buf[2];
+
+ /* Sanity check */
+ if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
+ return -EINVAL;
+ /* Select address */
+ buf[0] = addr >> 8;
+ buf[1] = addr & 0xff;
+ ret = i2c_master_send(&dev->i2c_client[bus],
+ buf + !addr_w16, 1 + addr_w16);
+ if (ret < 0)
+ return ret;
+ /* Read data */
+ if (dev->board.is_em2800)
+ rsize_max = 4;
+ else
+ rsize_max = 64;
+ while (remain > 0) {
+ if (remain > rsize_max)
+ rsize = rsize_max;
+ else
+ rsize = remain;
+
+ ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
+ if (ret < 0)
+ return ret;
+
+ remain -= rsize;
+ data += rsize;
+ }
+
+ return len;
+}
+
+static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus,
+ u8 **eedata, u16 *eedata_len)
+{
+ const u16 len = 256;
+ /*
+ * FIXME common length/size for bytes to read, to display, hash
+ * calculation and returned device dataset. Simplifies the code a lot,
+ * but we might have to deal with multiple sizes in the future !
+ */
+ int err;
+ struct em28xx_eeprom *dev_config;
+ u8 buf, *data;
+
+ *eedata = NULL;
+ *eedata_len = 0;
+
+ /* EEPROM is always on i2c bus 0 on all known devices. */
+
+ dev->i2c_client[bus].addr = 0xa0 >> 1;
+
+ /* Check if board has eeprom */
+ err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
+ if (err < 0) {
+ dev_info(&dev->intf->dev, "board has no eeprom\n");
+ return -ENODEV;
+ }
+
+ data = kzalloc(len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* Read EEPROM content */
+ err = em28xx_i2c_read_block(dev, bus, 0x0000,
+ dev->eeprom_addrwidth_16bit,
+ len, data);
+ if (err != len) {
+ dev_err(&dev->intf->dev,
+ "failed to read eeprom (err=%d)\n", err);
+ goto error;
+ }
+
+ if (i2c_debug) {
+ /* Display eeprom content */
+ print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET,
+ 16, 1, data, len, true);
+
+ if (dev->eeprom_addrwidth_16bit)
+ dev_info(&dev->intf->dev,
+ "eeprom %06x: ... (skipped)\n", 256);
+ }
+
+ if (dev->eeprom_addrwidth_16bit &&
+ data[0] == 0x26 && data[3] == 0x00) {
+ /* new eeprom format; size 4-64kb */
+ u16 mc_start;
+ u16 hwconf_offset;
+
+ dev->hash = em28xx_hash_mem(data, len, 32);
+ mc_start = (data[1] << 8) + 4; /* usually 0x0004 */
+
+ dev_info(&dev->intf->dev,
+ "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
+ data, dev->hash);
+ dev_info(&dev->intf->dev,
+ "EEPROM info:\n");
+ dev_info(&dev->intf->dev,
+ "\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
+ mc_start, data[2]);
+ /*
+ * boot configuration (address 0x0002):
+ * [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz
+ * [1] always selects 12 kb RAM
+ * [2] USB device speed: 1 = force Full Speed; 0 = auto detect
+ * [4] 1 = force fast mode and no suspend for device testing
+ * [5:7] USB PHY tuning registers; determined by device
+ * characterization
+ */
+
+ /*
+ * Read hardware config dataset offset from address
+ * (microcode start + 46)
+ */
+ err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
+ data);
+ if (err != 2) {
+ dev_err(&dev->intf->dev,
+ "failed to read hardware configuration data from eeprom (err=%d)\n",
+ err);
+ goto error;
+ }
+
+ /* Calculate hardware config dataset start address */
+ hwconf_offset = mc_start + data[0] + (data[1] << 8);
+
+ /* Read hardware config dataset */
+ /*
+ * NOTE: the microcode copy can be multiple pages long, but
+ * we assume the hardware config dataset is the same as in
+ * the old eeprom and not longer than 256 bytes.
+ * tveeprom is currently also limited to 256 bytes.
+ */
+ err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
+ data);
+ if (err != len) {
+ dev_err(&dev->intf->dev,
+ "failed to read hardware configuration data from eeprom (err=%d)\n",
+ err);
+ goto error;
+ }
+
+ /* Verify hardware config dataset */
+ /* NOTE: not all devices provide this type of dataset */
+ if (data[0] != 0x1a || data[1] != 0xeb ||
+ data[2] != 0x67 || data[3] != 0x95) {
+ dev_info(&dev->intf->dev,
+ "\tno hardware configuration dataset found in eeprom\n");
+ kfree(data);
+ return 0;
+ }
+
+ /*
+ * TODO: decrypt eeprom data for camera bridges
+ * (em25xx, em276x+)
+ */
+
+ } else if (!dev->eeprom_addrwidth_16bit &&
+ data[0] == 0x1a && data[1] == 0xeb &&
+ data[2] == 0x67 && data[3] == 0x95) {
+ dev->hash = em28xx_hash_mem(data, len, 32);
+ dev_info(&dev->intf->dev,
+ "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
+ data, dev->hash);
+ dev_info(&dev->intf->dev,
+ "EEPROM info:\n");
+ } else {
+ dev_info(&dev->intf->dev,
+ "unknown eeprom format or eeprom corrupted !\n");
+ err = -ENODEV;
+ goto error;
+ }
+
+ *eedata = data;
+ *eedata_len = len;
+ dev_config = (void *)*eedata;
+
+ switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
+ case 0:
+ dev_info(&dev->intf->dev, "\tNo audio on board.\n");
+ break;
+ case 1:
+ dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n");
+ break;
+ case 2:
+ if (dev->chip_id < CHIP_ID_EM2860)
+ dev_info(&dev->intf->dev,
+ "\tI2S audio, sample rate=32k\n");
+ else
+ dev_info(&dev->intf->dev,
+ "\tI2S audio, 3 sample rates\n");
+ break;
+ case 3:
+ if (dev->chip_id < CHIP_ID_EM2860)
+ dev_info(&dev->intf->dev,
+ "\tI2S audio, 3 sample rates\n");
+ else
+ dev_info(&dev->intf->dev,
+ "\tI2S audio, 5 sample rates\n");
+ break;
+ }
+
+ if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
+ dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n");
+
+ if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
+ dev_info(&dev->intf->dev, "\tUSB Self power capable\n");
+
+ switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
+ case 0:
+ dev_info(&dev->intf->dev, "\t500mA max power\n");
+ break;
+ case 1:
+ dev_info(&dev->intf->dev, "\t400mA max power\n");
+ break;
+ case 2:
+ dev_info(&dev->intf->dev, "\t300mA max power\n");
+ break;
+ case 3:
+ dev_info(&dev->intf->dev, "\t200mA max power\n");
+ break;
+ }
+ dev_info(&dev->intf->dev,
+ "\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
+ dev_config->string_idx_table,
+ le16_to_cpu(dev_config->string1),
+ le16_to_cpu(dev_config->string2),
+ le16_to_cpu(dev_config->string3));
+
+ return 0;
+
+error:
+ kfree(data);
+ return err;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *i2c_adap)
+{
+ struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
+
+ if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX ||
+ i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) {
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+ } else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) {
+ return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
+ ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
+ }
+
+ WARN(1, "Unknown i2c bus algorithm.\n");
+ return 0;
+}
+
+static const struct i2c_algorithm em28xx_algo = {
+ .master_xfer = em28xx_i2c_xfer,
+ .functionality = functionality,
+};
+
+static const struct i2c_adapter em28xx_adap_template = {
+ .owner = THIS_MODULE,
+ .name = "em28xx",
+ .algo = &em28xx_algo,
+};
+
+static const struct i2c_client em28xx_client_template = {
+ .name = "em28xx internal",
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static char *i2c_devs[128] = {
+ [0x1c >> 1] = "lgdt330x",
+ [0x3e >> 1] = "remote IR sensor",
+ [0x4a >> 1] = "saa7113h",
+ [0x52 >> 1] = "drxk",
+ [0x60 >> 1] = "remote IR sensor",
+ [0x8e >> 1] = "remote IR sensor",
+ [0x86 >> 1] = "tda9887",
+ [0x80 >> 1] = "msp34xx",
+ [0x88 >> 1] = "msp34xx",
+ [0xa0 >> 1] = "eeprom",
+ [0xb0 >> 1] = "tda9874",
+ [0xb8 >> 1] = "tvp5150a",
+ [0xba >> 1] = "webcam sensor or 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
+ */
+void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
+{
+ u8 i2c_devicelist[128];
+ unsigned char buf;
+ int i, rc;
+
+ memset(i2c_devicelist, 0, sizeof(i2c_devicelist));
+
+ for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
+ dev->i2c_client[bus].addr = i;
+ rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
+ if (rc < 0)
+ continue;
+ i2c_devicelist[i] = i;
+ dev_info(&dev->intf->dev,
+ "found i2c device @ 0x%x on bus %d [%s]\n",
+ i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
+ }
+
+ if (bus == dev->def_i2c_bus)
+ dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
+ sizeof(i2c_devicelist), 32);
+}
+
+/*
+ * em28xx_i2c_register()
+ * register i2c bus
+ */
+int em28xx_i2c_register(struct em28xx *dev, unsigned int bus,
+ enum em28xx_i2c_algo_type algo_type)
+{
+ int retval;
+
+ if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg ||
+ !dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req))
+ return -ENODEV;
+
+ if (bus >= NUM_I2C_BUSES)
+ return -ENODEV;
+
+ dev->i2c_adap[bus] = em28xx_adap_template;
+ dev->i2c_adap[bus].dev.parent = &dev->intf->dev;
+ strscpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev),
+ sizeof(dev->i2c_adap[bus].name));
+
+ dev->i2c_bus[bus].bus = bus;
+ dev->i2c_bus[bus].algo_type = algo_type;
+ dev->i2c_bus[bus].dev = dev;
+ dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
+
+ retval = i2c_add_adapter(&dev->i2c_adap[bus]);
+ if (retval < 0) {
+ dev_err(&dev->intf->dev,
+ "%s: i2c_add_adapter failed! retval [%d]\n",
+ __func__, retval);
+ return retval;
+ }
+
+ dev->i2c_client[bus] = em28xx_client_template;
+ dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
+
+ /* Up to now, all eeproms are at bus 0 */
+ if (!bus) {
+ retval = em28xx_i2c_eeprom(dev, bus,
+ &dev->eedata, &dev->eedata_len);
+ if (retval < 0 && retval != -ENODEV) {
+ dev_err(&dev->intf->dev,
+ "%s: em28xx_i2_eeprom failed! retval [%d]\n",
+ __func__, retval);
+ }
+ }
+
+ if (i2c_scan)
+ em28xx_do_i2c_scan(dev, bus);
+
+ return 0;
+}
+
+/*
+ * em28xx_i2c_unregister()
+ * unregister i2c_bus
+ */
+int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus)
+{
+ if (bus >= NUM_I2C_BUSES)
+ return -ENODEV;
+
+ i2c_del_adapter(&dev->i2c_adap[bus]);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 01:47:43 +0000