- add back per-device pwm setting support, now done via sysfs attributes

1. Locate the pwm setting
> find /sys/|grep "pwm"
/sys/devices/platform/i2c-0/0-0061/pwm
2. Set your desired value
echo "0x5c" > /sys/devices/platform/i2c-0/0-0061/pwm
3. Read the current value
more /sys/devices/platform/i2c-0/0-0061/pwm

1 files changed, 29 insertions, 0 deletions

diff --git a/linux/drivers/media/dvb/frontends/ves1820.c b/linux/drivers/media/dvb/frontends/ves1820.c
index 7bf168e85..09949c12f 100644
--- a/linux/drivers/media/dvb/frontends/ves1820.c
+++ b/linux/drivers/media/dvb/frontends/ves1820.c
@@ -33,8 +33,11 @@
 #include "dvb_i2c.h"
 
 /* I2C_DRIVERID_VES1820 is already defined in i2c-id.h */
+
+#if 0
 static int debug = 0;
 #define dprintk	if (debug) printk
+#endif
 
 static int verbose;
 
@@ -484,6 +487,29 @@ static long probe_demod_addr(struct i2c_adapter *i2c)
 	return -1;
 }
 
+static ssize_t attr_read_pwm(struct device *dev, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ves1820_state *state = (struct ves1820_state *) i2c_get_clientdata(client);
+	return sprintf(buf, "0x%02x\n", state->pwm);
+}
+
+static ssize_t attr_write_pwm(struct device *dev, const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ves1820_state *state = (struct ves1820_state *) i2c_get_clientdata(client);
+	unsigned long pwm;
+	pwm = simple_strtoul(buf, NULL, 0);
+	state->pwm = pwm & 0xff;
+	return strlen(buf)+1;
+}
+
+static struct device_attribute dev_attr_client_name = {
+	.attr	= { .name = "pwm", .mode = S_IRUGO|S_IWUGO, .owner = THIS_MODULE },
+	.show	= &attr_read_pwm,
+	.store  = &attr_write_pwm,
+};
+
 static struct i2c_client client_template;
 
 static int attach_adapter(struct i2c_adapter *adapter)
@@ -536,6 +562,8 @@ static int attach_adapter(struct i2c_adapter *adapter)
 
 	BUG_ON(!state->dvb);
 
+	device_create_file(&client->dev, &dev_attr_client_name);
+
 	ret = dvb_register_frontend_new(ves1820_ioctl, state->dvb, state, &ves1820_info, THIS_MODULE);
 	if (ret) {
 		i2c_detach_client(client);
@@ -551,6 +579,7 @@ static int detach_client(struct i2c_client *client)
 {
 	struct ves1820_state *state = (struct ves1820_state *) i2c_get_clientdata(client);
 	dvb_unregister_frontend_new(ves1820_ioctl, state->dvb);
+	device_remove_file(&client->dev, &dev_attr_client_name);
 	i2c_detach_client(client);
 	BUG_ON(state->dvb);
 	kfree(client);