[media] rtl2832: change the i2c gate to be mux-locked

The root i2c adapter lock is then no longer held by the i2c mux during
accesses behind the i2c gate, and such accesses need to take that lock
just like any other ordinary i2c accesses do.

So, declare the i2c gate mux-locked, and zap the regmap overrides
that makes the i2c accesses unlocked and use plain old regmap
accesses. This also removes the need for the regmap wrappers used by
rtl2832_sdr, so deconvolute the code further and provide the regmap
handle directly instead of the wrapper functions.
Tested-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/i2c/i2c-topology

@@ -55,7 +55,7 @@ imu/inv_mpu6050/          Mux-locked
 In drivers/media/
 dvb-frontends/m88ds3103   Parent-locked
 dvb-frontends/rtl2830     Parent-locked
-dvb-frontends/rtl2832     Parent-locked
+dvb-frontends/rtl2832     Mux-locked
 dvb-frontends/si2168      Mux-locked
 usb/cx231xx/              Parent-locked
 

drivers/media/dvb-frontends/rtl2832.h

@@ -57,9 +57,7 @@ struct rtl2832_platform_data {
 	int (*pid_filter)(struct dvb_frontend *, u8, u16, int);
 	int (*pid_filter_ctrl)(struct dvb_frontend *, int);
 /* private: Register access for SDR module use only */
-	int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t);
-	int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t);
-	int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int);
+	struct regmap *regmap;
 };
 
 #endif /* RTL2832_H */

drivers/media/dvb-frontends/rtl2832_sdr.c

@@ -35,6 +35,7 @@
 #include <linux/platform_device.h>
 #include <linux/jiffies.h>
 #include <linux/math64.h>
+#include <linux/regmap.h>
 
 static bool rtl2832_sdr_emulated_fmt;
 module_param_named(emulated_formats, rtl2832_sdr_emulated_fmt, bool, 0644);
@@ -169,9 +170,9 @@ static int rtl2832_sdr_wr_regs(struct rtl2832_sdr_dev *dev, u16 reg,
 {
 	struct platform_device *pdev = dev->pdev;
 	struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data;
-	struct i2c_client *client = pdata->i2c_client;
+	struct regmap *regmap = pdata->regmap;
 
-	return pdata->bulk_write(client, reg, val, len);
+	return regmap_bulk_write(regmap, reg, val, len);
 }
 
 #if 0
@@ -181,9 +182,9 @@ static int rtl2832_sdr_rd_regs(struct rtl2832_sdr_dev *dev, u16 reg, u8 *val,
 {
 	struct platform_device *pdev = dev->pdev;
 	struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data;
-	struct i2c_client *client = pdata->i2c_client;
+	struct regmap *regmap = pdata->regmap;
 
-	return pdata->bulk_read(client, reg, val, len);
+	return regmap_bulk_read(regmap, reg, val, len);
 }
 #endif
 
@@ -199,9 +200,9 @@ static int rtl2832_sdr_wr_reg_mask(struct rtl2832_sdr_dev *dev, u16 reg,
 {
 	struct platform_device *pdev = dev->pdev;
 	struct rtl2832_sdr_platform_data *pdata = pdev->dev.platform_data;
-	struct i2c_client *client = pdata->i2c_client;
+	struct regmap *regmap = pdata->regmap;
 
-	return pdata->update_bits(client, reg, mask, val);
+	return regmap_update_bits(regmap, reg, mask, val);
 }
 
 /* Private functions */

drivers/media/dvb-frontends/rtl2832_sdr.h

@@ -56,10 +56,7 @@ struct rtl2832_sdr_platform_data {
 #define RTL2832_SDR_TUNER_R828D     0x2b
 	u8 tuner;
 
-	struct i2c_client *i2c_client;
-	int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t);
-	int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t);
-	int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int);
+	struct regmap *regmap;
 	struct dvb_frontend *dvb_frontend;
 	struct v4l2_subdev *v4l2_subdev;
 	struct dvb_usb_device *dvb_usb_device;

drivers/media/usb/dvb-usb-v2/rtl28xxu.c

@@ -1333,10 +1333,7 @@ static int rtl2832u_tuner_attach(struct dvb_usb_adapter *adap)
 	case TUNER_RTL2832_R828D:
 		pdata.clk = dev->rtl2832_platform_data.clk;
 		pdata.tuner = dev->tuner;
-		pdata.i2c_client = dev->i2c_client_demod;
-		pdata.bulk_read = dev->rtl2832_platform_data.bulk_read;
-		pdata.bulk_write = dev->rtl2832_platform_data.bulk_write;
-		pdata.update_bits = dev->rtl2832_platform_data.update_bits;
+		pdata.regmap = dev->rtl2832_platform_data.regmap;
 		pdata.dvb_frontend = adap->fe[0];
 		pdata.dvb_usb_device = d;
 		pdata.v4l2_subdev = subdev;