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Date: Thu, 14 Mar 2013 15:06:59 +0100
From: Jon Arne Jørgensen <jonarne@...arne.no>
To: linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hverkuil@...all.nl,
elezegarcia@...il.com,
Jon Arne Jørgensen <jonarne@...arne.no>
Subject: [RFC V1 3/8] smi2021: Add smi2021_i2c.c
This file is responsible for registering the device
with the kernel i2c subsystem.
v4l2 talks to the saa7113 chip of the device via i2c.
Signed-off-by: Jon Arne Jørgensen <jonarne@...arne.no>
---
drivers/media/usb/smi2021/smi2021_i2c.c | 160 ++++++++++++++++++++++++++++++++
1 file changed, 160 insertions(+)
create mode 100644 drivers/media/usb/smi2021/smi2021_i2c.c
diff --git a/drivers/media/usb/smi2021/smi2021_i2c.c b/drivers/media/usb/smi2021/smi2021_i2c.c
new file mode 100644
index 0000000..5b6f3f5
--- /dev/null
+++ b/drivers/media/usb/smi2021/smi2021_i2c.c
@@ -0,0 +1,160 @@
+/*******************************************************************************
+ * smi2021_i2c.c *
+ * *
+ * USB Driver for SMI2021 - EasyCAP *
+ * USB ID 1c88:003c *
+ * *
+ * *****************************************************************************
+ *
+ * Copyright 2011-2013 Jon Arne Jørgensen
+ * <jonjon.arnearne--a.t--gmail.com>
+ *
+ * Copyright 2011, 2012 Tony Brown, Michal Demin, Jeffry Johnston
+ *
+ * This file is part of SMI2021
+ * http://code.google.com/p/easycap-somagic-linux/
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * This driver is heavily influensed by the STK1160 driver.
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ */
+
+#include "smi2021.h"
+
+/* The device will not return the chip_name on address 0x00.
+ * But the saa7115 i2c driver needs the chip id to match "f7113"
+ * if we want to use it,
+ * so we have to fake the return of this value
+ */
+
+static char chip_id[] = { 'x', 255, 55, 49, 49, 115, 0 };
+static int id_ptr;
+
+static unsigned int i2c_debug;
+module_param(i2c_debug, int, 0644);
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define dprint_i2c(fmt, args...) \
+do { \
+ if (i2c_debug) \
+ pr_debug("smi2021[i2c]::%s: " fmt, __func__, ##args); \
+} while (0)
+
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct smi2021_dev *dev = i2c_adap->algo_data;
+
+ switch (num) {
+ case 2: { /* Read reg */
+ if (msgs[0].len != 1 || msgs[1].len != 1) {
+ dprint_i2c("both messages must be 1 byte\n");
+ goto err_out;
+
+ if ((msgs[1].flags & I2C_M_RD) != I2C_M_RD)
+ dprint_i2c("last message should have rd flag\n");
+ goto err_out;
+ }
+
+ if (msgs[0].buf[0] == 0) {
+ msgs[1].buf[0] = chip_id[id_ptr];
+ if (chip_id[id_ptr] != 0)
+ id_ptr += 1;
+ } else {
+ smi2021_read_reg(dev, msgs[0].addr, msgs[0].buf[0],
+ msgs[1].buf);
+ }
+ break;
+ }
+ case 1: { /* Write reg */
+ if (msgs[0].len == 0) {
+ break;
+ } else if (msgs[0].len != 2) {
+ dprint_i2c("unsupported len\n");
+ goto err_out;
+ }
+ if (msgs[0].buf[0] == 0) {
+ /* We don't handle writing to addr 0x00 */
+ break;
+ }
+
+ smi2021_write_reg(dev, msgs[0].addr, msgs[0].buf[0],
+ msgs[0].buf[1]);
+ break;
+ }
+ default: {
+ dprint_i2c("driver can only handle 1 or 2 messages\n");
+ goto err_out;
+ }
+ }
+ return num;
+
+err_out:
+ return -EOPNOTSUPP;
+}
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm algo = {
+ .master_xfer = i2c_xfer,
+ .functionality = functionality,
+};
+
+static struct i2c_adapter adap_template = {
+ .owner = THIS_MODULE,
+ .name = "smi2021_easycap_dc60",
+ .algo = &algo,
+};
+
+static struct i2c_client client_template = {
+ .name = "smi2021 internal",
+};
+
+int smi2021_i2c_register(struct smi2021_dev *dev)
+{
+ int rc;
+
+ id_ptr = 0;
+
+ dev->i2c_adap = adap_template;
+ dev->i2c_adap.dev.parent = dev->dev;
+ strcpy(dev->i2c_adap.name, "smi2021");
+ dev->i2c_adap.algo_data = dev;
+
+ i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
+
+ rc = i2c_add_adapter(&dev->i2c_adap);
+ if (rc < 0) {
+ smi2021_err("can't add i2c adapter, errno: %d\n", rc);
+ return rc;
+ }
+
+ dev->i2c_client = client_template;
+ dev->i2c_client.adapter = &dev->i2c_adap;
+
+ return 0;
+}
+
+int smi2021_i2c_unregister(struct smi2021_dev *dev)
+{
+ i2c_del_adapter(&dev->i2c_adap);
+ return 0;
+}
--
1.8.1.1
--
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