msm: 8974: MHL Driver for SI-8334 Tx

The B-family device driver for SI8334 Silicon Image's
Mobile High-definition Link (MHL) Transmitter implements
wake-up, discovery and communication with MHL sink.
The MHL-8334 Tx is attached to MSM as an I2C-client.

Change-Id: I33f6c6f00011b590f9913cdbbe44544472b60982
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
[cip@codeaurora.org: Moved mhl_sii8334.c file location]
Signed-off-by: Clarence Ip <cip@codeaurora.org>

Documentation/devicetree/bindings/i2c/sii8334-i2c.txt

@@ -0,0 +1,26 @@
+* Silicon Image-8334 MHL Tx
+
+Required properties:
+- compatible: must be "qcom,mhl-sii8334"
+- reg: i2c slave address
+- mhl-intr-gpio: MHL interrupt gpio coming out of sii8334
+- mhl-pwr-gpio: MHL power gpio required for power rails
+- mhl-rst-gpio: MHL reset gpio going into sii8334 for toggling reset pin
+- <supply-name>-supply: phandle to the regulator device tree node.
+
+Example:
+	i2c@f9967000 {
+		sii8334@72 {
+			compatible = "qcom,mhl-sii8334";
+			reg = <0x72>;
+			interrupt-parent = <&msmgpio>;
+			interrupts = <82 0x8>;
+			mhl-intr-gpio = <&msmgpio 82 0>;
+			mhl-pwr-gpio = <&msmgpio 12 0>;
+			mhl-rst-gpio = <&pm8941_mpps 8 0>;
+			avcc_18-supply = <&pm8941_l24>;
+			avcc_12-supply = <&pm8941_l2>;
+			smps3a-supply = <&pm8941_s3>;
+			vdda-supply = <&pm8941_l12>;
+		};
+	};

drivers/video/fbdev/msm/Kconfig

@@ -947,4 +947,13 @@ config FB_MSM_MDSS_HDMI_PANEL
 	The MDSS HDMI Panel provides support for transmitting TMDS signals of
 	MDSS frame buffer data to connected hdmi compliant TVs, monitors etc.
 
+config FB_MSM_MDSS_HDMI_MHL_8334
+	depends on FB_MSM_MDSS_HDMI_PANEL
+	bool 'MHL SII8334 support '
+	default n
+	---help---
+	  Support the HDMI to MHL conversion.
+	  MHL (Mobile High-Definition Link) technology
+	  uses USB connector to output HDMI content
+
 endif

drivers/video/fbdev/msm/Makefile

@@ -18,5 +18,6 @@ obj-$(CONFIG_FB_MSM_MDSS) += mdss_io_util.o
 obj-$(CONFIG_FB_MSM_MDSS_HDMI_PANEL) += mdss_hdmi_tx.o
 obj-$(CONFIG_FB_MSM_MDSS_HDMI_PANEL) += mdss_hdmi_util.o
 obj-$(CONFIG_FB_MSM_MDSS_HDMI_PANEL) += mdss_hdmi_edid.o
+obj-$(CONFIG_FB_MSM_MDSS_HDMI_MHL_8334) += mhl_sii8334.o
 
 obj-$(CONFIG_FB_MSM_MDSS_WRITEBACK) += mdss_wb.o

drivers/video/fbdev/msm/mdss_io_util.c

@@ -16,6 +16,7 @@
 #include <linux/regulator/consumer.h>
 #include "mdss_io_util.h"
 
+#define MAX_I2C_CMDS  16
 void dss_reg_w(struct dss_io_data *io, u32 offset, u32 value, u32 debug)
 {
 	u32 in_val;
@@ -383,3 +384,59 @@ int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
 
 	return rc;
 } /* msm_dss_enable_clk */
+
+
+int mdss_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
+			uint8_t reg_offset, uint8_t *read_buf)
+{
+	struct i2c_msg msgs[2];
+	int ret = -1;
+
+	pr_debug("%s: reading from slave_addr=[%x] and offset=[%x]\n",
+		 __func__, slave_addr, reg_offset);
+
+	msgs[0].addr = slave_addr >> 1;
+	msgs[0].flags = 0;
+	msgs[0].buf = &reg_offset;
+	msgs[0].len = 1;
+
+	msgs[1].addr = slave_addr >> 1;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].buf = read_buf;
+	msgs[1].len = 1;
+
+	ret = i2c_transfer(client->adapter, msgs, 2);
+	if (ret < 1) {
+		pr_err("%s: I2C READ FAILED=[%d]\n", __func__, ret);
+		return -EACCES;
+	}
+	pr_debug("%s: i2c buf is [%x]\n", __func__, *read_buf);
+	return 0;
+}
+
+int mdss_i2c_byte_write(struct i2c_client *client, uint8_t slave_addr,
+			uint8_t reg_offset, uint8_t *value)
+{
+	struct i2c_msg msgs[1];
+	uint8_t data[2];
+	int status = -EACCES;
+
+	pr_debug("%s: writing from slave_addr=[%x] and offset=[%x]\n",
+		 __func__, slave_addr, reg_offset);
+
+	data[0] = reg_offset;
+	data[1] = *value;
+
+	msgs[0].addr = slave_addr >> 1;
+	msgs[0].flags = 0;
+	msgs[0].len = 2;
+	msgs[0].buf = data;
+
+	status = i2c_transfer(client->adapter, msgs, 1);
+	if (status < 1) {
+		pr_err("I2C WRITE FAILED=[%d]\n", status);
+		return -EACCES;
+	}
+	pr_debug("%s: I2C write status=%x\n", __func__, status);
+	return status;
+}

drivers/video/fbdev/msm/mdss_io_util.h

@@ -16,6 +16,8 @@
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
+#include <linux/i2c.h>
+#include <linux/types.h>
 
 #ifdef DEBUG
 #define DEV_DBG(fmt, args...)   pr_err(fmt, ##args)
@@ -97,4 +99,9 @@ void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk);
 int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk);
 int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable);
 
+int mdss_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
+		       uint8_t reg_offset, uint8_t *read_buf);
+int mdss_i2c_byte_write(struct i2c_client *client, uint8_t slave_addr,
+			uint8_t reg_offset, uint8_t *value);
+
 #endif /* __MDSS_IO_UTIL_H__ */