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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-08-14 15:13:30 (GMT)
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-15 19:36:22 (GMT)
commitb285192a43f0432d82c2c10974204e78af0da596 (patch)
tree618aa87e760c9c949eca9e4df6ae0eeffa11dcfc /drivers/media/pci/cx23885/cx23885-i2c.c
parent68de959f773a1d49096835c411390bceff5d1549 (diff)
[media] rename most media/video pci drivers to media/pci
Rename all PCI drivers with their own directory under drivers/media/video into drivers/media/pci and update the building system. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/pci/cx23885/cx23885-i2c.c')
-rw-r--r--drivers/media/pci/cx23885/cx23885-i2c.c396
1 files changed, 396 insertions, 0 deletions
diff --git a/drivers/media/pci/cx23885/cx23885-i2c.c b/drivers/media/pci/cx23885/cx23885-i2c.c
new file mode 100644
index 0000000..4887314
--- /dev/null
+++ b/drivers/media/pci/cx23885/cx23885-i2c.c
@@ -0,0 +1,396 @@
+/*
+ * Driver for the Conexant CX23885 PCIe bridge
+ *
+ * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
+ *
+ * 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/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+
+#include "cx23885.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 dprintk(level, fmt, arg...)\
+ do { if (i2c_debug >= level)\
+ printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
+ } while (0)
+
+#define I2C_WAIT_DELAY 32
+#define I2C_WAIT_RETRY 64
+
+#define I2C_EXTEND (1 << 3)
+#define I2C_NOSTOP (1 << 4)
+
+static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
+{
+ struct cx23885_i2c *bus = i2c_adap->algo_data;
+ struct cx23885_dev *dev = bus->dev;
+ return cx_read(bus->reg_stat) & 0x01;
+}
+
+static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
+{
+ struct cx23885_i2c *bus = i2c_adap->algo_data;
+ struct cx23885_dev *dev = bus->dev;
+ return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
+}
+
+static int i2c_wait_done(struct i2c_adapter *i2c_adap)
+{
+ int count;
+
+ for (count = 0; count < I2C_WAIT_RETRY; count++) {
+ if (!i2c_is_busy(i2c_adap))
+ break;
+ udelay(I2C_WAIT_DELAY);
+ }
+
+ if (I2C_WAIT_RETRY == count)
+ return 0;
+
+ return 1;
+}
+
+static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg, int joined_rlen)
+{
+ struct cx23885_i2c *bus = i2c_adap->algo_data;
+ struct cx23885_dev *dev = bus->dev;
+ u32 wdata, addr, ctrl;
+ int retval, cnt;
+
+ if (joined_rlen)
+ dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
+ msg->len, joined_rlen);
+ else
+ dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
+
+ /* Deal with i2c probe functions with zero payload */
+ if (msg->len == 0) {
+ cx_write(bus->reg_addr, msg->addr << 25);
+ cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
+ if (!i2c_wait_done(i2c_adap))
+ return -EIO;
+ if (!i2c_slave_did_ack(i2c_adap))
+ return -ENXIO;
+
+ dprintk(1, "%s() returns 0\n", __func__);
+ return 0;
+ }
+
+
+ /* dev, reg + first byte */
+ addr = (msg->addr << 25) | msg->buf[0];
+ wdata = msg->buf[0];
+ ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
+
+ if (msg->len > 1)
+ ctrl |= I2C_NOSTOP | I2C_EXTEND;
+ else if (joined_rlen)
+ ctrl |= I2C_NOSTOP;
+
+ cx_write(bus->reg_addr, addr);
+ cx_write(bus->reg_wdata, wdata);
+ cx_write(bus->reg_ctrl, ctrl);
+
+ if (!i2c_wait_done(i2c_adap))
+ goto eio;
+ if (i2c_debug) {
+ printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
+ if (!(ctrl & I2C_NOSTOP))
+ printk(" >\n");
+ }
+
+ for (cnt = 1; cnt < msg->len; cnt++) {
+ /* following bytes */
+ wdata = msg->buf[cnt];
+ ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
+
+ if (cnt < msg->len - 1)
+ ctrl |= I2C_NOSTOP | I2C_EXTEND;
+ else if (joined_rlen)
+ ctrl |= I2C_NOSTOP;
+
+ cx_write(bus->reg_addr, addr);
+ cx_write(bus->reg_wdata, wdata);
+ cx_write(bus->reg_ctrl, ctrl);
+
+ if (!i2c_wait_done(i2c_adap))
+ goto eio;
+ if (i2c_debug) {
+ dprintk(1, " %02x", msg->buf[cnt]);
+ if (!(ctrl & I2C_NOSTOP))
+ dprintk(1, " >\n");
+ }
+ }
+ return msg->len;
+
+ eio:
+ retval = -EIO;
+ if (i2c_debug)
+ printk(KERN_ERR " ERR: %d\n", retval);
+ return retval;
+}
+
+static int i2c_readbytes(struct i2c_adapter *i2c_adap,
+ const struct i2c_msg *msg, int joined)
+{
+ struct cx23885_i2c *bus = i2c_adap->algo_data;
+ struct cx23885_dev *dev = bus->dev;
+ u32 ctrl, cnt;
+ int retval;
+
+
+ if (i2c_debug && !joined)
+ dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
+
+ /* Deal with i2c probe functions with zero payload */
+ if (msg->len == 0) {
+ cx_write(bus->reg_addr, msg->addr << 25);
+ cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
+ if (!i2c_wait_done(i2c_adap))
+ return -EIO;
+ if (!i2c_slave_did_ack(i2c_adap))
+ return -ENXIO;
+
+
+ dprintk(1, "%s() returns 0\n", __func__);
+ return 0;
+ }
+
+ if (i2c_debug) {
+ if (joined)
+ dprintk(1, " R");
+ else
+ dprintk(1, " <R %02x", (msg->addr << 1) + 1);
+ }
+
+ for (cnt = 0; cnt < msg->len; cnt++) {
+
+ ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
+
+ if (cnt < msg->len - 1)
+ ctrl |= I2C_NOSTOP | I2C_EXTEND;
+
+ cx_write(bus->reg_addr, msg->addr << 25);
+ cx_write(bus->reg_ctrl, ctrl);
+
+ if (!i2c_wait_done(i2c_adap))
+ goto eio;
+ msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
+ if (i2c_debug) {
+ dprintk(1, " %02x", msg->buf[cnt]);
+ if (!(ctrl & I2C_NOSTOP))
+ dprintk(1, " >\n");
+ }
+ }
+ return msg->len;
+
+ eio:
+ retval = -EIO;
+ if (i2c_debug)
+ printk(KERN_ERR " ERR: %d\n", retval);
+ return retval;
+}
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct cx23885_i2c *bus = i2c_adap->algo_data;
+ struct cx23885_dev *dev = bus->dev;
+ int i, retval = 0;
+
+ dprintk(1, "%s(num = %d)\n", __func__, num);
+
+ for (i = 0 ; i < num; i++) {
+ dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
+ __func__, num, msgs[i].addr, msgs[i].len);
+ if (msgs[i].flags & I2C_M_RD) {
+ /* read */
+ retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
+ } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+ msgs[i].addr == msgs[i + 1].addr) {
+ /* write then read from same address */
+ retval = i2c_sendbytes(i2c_adap, &msgs[i],
+ msgs[i + 1].len);
+ if (retval < 0)
+ goto err;
+ i++;
+ retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
+ } else {
+ /* write */
+ retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
+ }
+ if (retval < 0)
+ goto err;
+ }
+ return num;
+
+ err:
+ return retval;
+}
+
+static u32 cx23885_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm cx23885_i2c_algo_template = {
+ .master_xfer = i2c_xfer,
+ .functionality = cx23885_functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_adapter cx23885_i2c_adap_template = {
+ .name = "cx23885",
+ .owner = THIS_MODULE,
+ .algo = &cx23885_i2c_algo_template,
+};
+
+static struct i2c_client cx23885_i2c_client_template = {
+ .name = "cx23885 internal",
+};
+
+static char *i2c_devs[128] = {
+ [0x10 >> 1] = "tda10048",
+ [0x12 >> 1] = "dib7000pc",
+ [0x1c >> 1] = "lgdt3303",
+ [0x86 >> 1] = "tda9887",
+ [0x32 >> 1] = "cx24227",
+ [0x88 >> 1] = "cx25837",
+ [0x84 >> 1] = "tda8295",
+ [0x98 >> 1] = "flatiron",
+ [0xa0 >> 1] = "eeprom",
+ [0xc0 >> 1] = "tuner/mt2131/tda8275",
+ [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
+ [0xc8 >> 1] = "tuner/xc3028L",
+};
+
+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: i2c scan: found device @ 0x%x [%s]\n",
+ name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+ }
+}
+
+/* init + register i2c adapter */
+int cx23885_i2c_register(struct cx23885_i2c *bus)
+{
+ struct cx23885_dev *dev = bus->dev;
+
+ dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
+
+ bus->i2c_adap = cx23885_i2c_adap_template;
+ bus->i2c_client = cx23885_i2c_client_template;
+ bus->i2c_adap.dev.parent = &dev->pci->dev;
+
+ strlcpy(bus->i2c_adap.name, bus->dev->name,
+ sizeof(bus->i2c_adap.name));
+
+ bus->i2c_adap.algo_data = bus;
+ i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
+ i2c_add_adapter(&bus->i2c_adap);
+
+ bus->i2c_client.adapter = &bus->i2c_adap;
+
+ if (0 == bus->i2c_rc) {
+ dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
+ if (i2c_scan) {
+ printk(KERN_INFO "%s: scan bus %d:\n",
+ dev->name, bus->nr);
+ do_i2c_scan(dev->name, &bus->i2c_client);
+ }
+ } else
+ printk(KERN_WARNING "%s: i2c bus %d register FAILED\n",
+ dev->name, bus->nr);
+
+ /* Instantiate the IR receiver device, if present */
+ if (0 == bus->i2c_rc) {
+ struct i2c_board_info info;
+ const unsigned short addr_list[] = {
+ 0x6b, I2C_CLIENT_END
+ };
+
+ memset(&info, 0, sizeof(struct i2c_board_info));
+ strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
+ /* Use quick read command for probe, some IR chips don't
+ * support writes */
+ i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
+ i2c_probe_func_quick_read);
+ }
+
+ return bus->i2c_rc;
+}
+
+int cx23885_i2c_unregister(struct cx23885_i2c *bus)
+{
+ i2c_del_adapter(&bus->i2c_adap);
+ return 0;
+}
+
+void cx23885_av_clk(struct cx23885_dev *dev, int enable)
+{
+ /* write 0 to bus 2 addr 0x144 via i2x_xfer() */
+ char buffer[3];
+ struct i2c_msg msg;
+ dprintk(1, "%s(enabled = %d)\n", __func__, enable);
+
+ /* Register 0x144 */
+ buffer[0] = 0x01;
+ buffer[1] = 0x44;
+ if (enable == 1)
+ buffer[2] = 0x05;
+ else
+ buffer[2] = 0x00;
+
+ msg.addr = 0x44;
+ msg.flags = I2C_M_TEN;
+ msg.len = 3;
+ msg.buf = buffer;
+
+ i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
+}
+
+/* ----------------------------------------------------------------------- */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */

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