drivers/mfd/rtsx_usb.c - kernel/msm-4.19 - Gitiles

 /* Driver for Realtek USB card reader
  *
  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2
  * as published by the Free Software Foundation.
  *
  * 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/>.
  *
  * Author:
  *   Roger Tseng <rogerable@realtek.com>
  */
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/usb.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rtsx_usb.h>

 static int polling_pipe = 1;
 module_param(polling_pipe, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(polling_pipe, "polling pipe (0: ctl, 1: bulk)");

 static const struct mfd_cell rtsx_usb_cells[] = {
 	[RTSX_USB_SD_CARD] = {
 		.name = "rtsx_usb_sdmmc",
 		.pdata_size = 0,
 	},
 	[RTSX_USB_MS_CARD] = {
 		.name = "rtsx_usb_ms",
 		.pdata_size = 0,
 	},
 };

 static void rtsx_usb_sg_timed_out(unsigned long data)
 {
 	struct rtsx_ucr *ucr = (struct rtsx_ucr *)data;

 	dev_dbg(&ucr->pusb_intf->dev, "%s: sg transfer timed out", __func__);
 	usb_sg_cancel(&ucr->current_sg);

 	/* we know the cancellation is caused by time-out */
 	ucr->current_sg.status = -ETIMEDOUT;
 }

 static int rtsx_usb_bulk_transfer_sglist(struct rtsx_ucr *ucr,
 		unsigned int pipe, struct scatterlist *sg, int num_sg,
 		unsigned int length, unsigned int *act_len, int timeout)
 {
 	int ret;

 	dev_dbg(&ucr->pusb_intf->dev, "%s: xfer %u bytes, %d entries\n",
 			__func__, length, num_sg);
 	ret = usb_sg_init(&ucr->current_sg, ucr->pusb_dev, pipe, 0,
 			sg, num_sg, length, GFP_NOIO);
 	if (ret)
 		return ret;

 	ucr->sg_timer.expires = jiffies + msecs_to_jiffies(timeout);
 	add_timer(&ucr->sg_timer);
 	usb_sg_wait(&ucr->current_sg);
 	del_timer_sync(&ucr->sg_timer);

 	if (act_len)
 		*act_len = ucr->current_sg.bytes;

 	return ucr->current_sg.status;
 }

 int rtsx_usb_transfer_data(struct rtsx_ucr *ucr, unsigned int pipe,
 			      void *buf, unsigned int len, int num_sg,
 			      unsigned int *act_len, int timeout)
 {
 	if (timeout < 600)
 		timeout = 600;

 	if (num_sg)
 		return rtsx_usb_bulk_transfer_sglist(ucr, pipe,
 				(struct scatterlist *)buf, num_sg, len, act_len,
 				timeout);
 	else
 		return usb_bulk_msg(ucr->pusb_dev, pipe, buf, len, act_len,
 				timeout);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_transfer_data);

 static inline void rtsx_usb_seq_cmd_hdr(struct rtsx_ucr *ucr,
 		u16 addr, u16 len, u8 seq_type)
 {
 	rtsx_usb_cmd_hdr_tag(ucr);

 	ucr->cmd_buf[PACKET_TYPE] = seq_type;
 	ucr->cmd_buf[5] = (u8)(len >> 8);
 	ucr->cmd_buf[6] = (u8)len;
 	ucr->cmd_buf[8] = (u8)(addr >> 8);
 	ucr->cmd_buf[9] = (u8)addr;

 	if (seq_type == SEQ_WRITE)
 		ucr->cmd_buf[STAGE_FLAG] = 0;
 	else
 		ucr->cmd_buf[STAGE_FLAG] = STAGE_R;
 }

 static int rtsx_usb_seq_write_register(struct rtsx_ucr *ucr,
 		u16 addr, u16 len, u8 *data)
 {
 	u16 cmd_len = ALIGN(SEQ_WRITE_DATA_OFFSET + len, 4);

 	if (!data)
 		return -EINVAL;

 	if (cmd_len > IOBUF_SIZE)
 		return -EINVAL;

 	rtsx_usb_seq_cmd_hdr(ucr, addr, len, SEQ_WRITE);
 	memcpy(ucr->cmd_buf + SEQ_WRITE_DATA_OFFSET, data, len);

 	return rtsx_usb_transfer_data(ucr,
 			usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
 			ucr->cmd_buf, cmd_len, 0, NULL, 100);
 }

 static int rtsx_usb_seq_read_register(struct rtsx_ucr *ucr,
 		u16 addr, u16 len, u8 *data)
 {
 	int i, ret;
 	u16 rsp_len = round_down(len, 4);
 	u16 res_len = len - rsp_len;

 	if (!data)
 		return -EINVAL;

 	/* 4-byte aligned part */
 	if (rsp_len) {
 		rtsx_usb_seq_cmd_hdr(ucr, addr, len, SEQ_READ);
 		ret = rtsx_usb_transfer_data(ucr,
 				usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
 				ucr->cmd_buf, 12, 0, NULL, 100);
 		if (ret)
 			return ret;

 		ret = rtsx_usb_transfer_data(ucr,
 				usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN),
 				data, rsp_len, 0, NULL, 100);
 		if (ret)
 			return ret;
 	}

 	/* unaligned part */
 	for (i = 0; i < res_len; i++) {
 		ret = rtsx_usb_read_register(ucr, addr + rsp_len + i,
 				data + rsp_len + i);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 int rtsx_usb_read_ppbuf(struct rtsx_ucr *ucr, u8 *buf, int buf_len)
 {
 	return rtsx_usb_seq_read_register(ucr, PPBUF_BASE2, (u16)buf_len, buf);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_read_ppbuf);

 int rtsx_usb_write_ppbuf(struct rtsx_ucr *ucr, u8 *buf, int buf_len)
 {
 	return rtsx_usb_seq_write_register(ucr, PPBUF_BASE2, (u16)buf_len, buf);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_write_ppbuf);

 int rtsx_usb_ep0_write_register(struct rtsx_ucr *ucr, u16 addr,
 		u8 mask, u8 data)
 {
 	u16 value, index;

 	addr |= EP0_WRITE_REG_CMD << EP0_OP_SHIFT;
 	value = swab16(addr);
 	index = mask | data << 8;

 	return usb_control_msg(ucr->pusb_dev,
 			usb_sndctrlpipe(ucr->pusb_dev, 0), RTSX_USB_REQ_REG_OP,
 			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			value, index, NULL, 0, 100);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_ep0_write_register);

 int rtsx_usb_ep0_read_register(struct rtsx_ucr *ucr, u16 addr, u8 *data)
 {
 	u16 value;
 	u8 *buf;
 	int ret;

 	if (!data)
 		return -EINVAL;

 	buf = kzalloc(sizeof(u8), GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	addr |= EP0_READ_REG_CMD << EP0_OP_SHIFT;
 	value = swab16(addr);

 	ret = usb_control_msg(ucr->pusb_dev,
 			usb_rcvctrlpipe(ucr->pusb_dev, 0), RTSX_USB_REQ_REG_OP,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			value, 0, buf, 1, 100);
 	*data = *buf;

 	kfree(buf);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_ep0_read_register);

 void rtsx_usb_add_cmd(struct rtsx_ucr *ucr, u8 cmd_type, u16 reg_addr,
 		u8 mask, u8 data)
 {
 	int i;

 	if (ucr->cmd_idx < (IOBUF_SIZE - CMD_OFFSET) / 4) {
 		i = CMD_OFFSET + ucr->cmd_idx * 4;

 		ucr->cmd_buf[i++] = ((cmd_type & 0x03) << 6) |
 			(u8)((reg_addr >> 8) & 0x3F);
 		ucr->cmd_buf[i++] = (u8)reg_addr;
 		ucr->cmd_buf[i++] = mask;
 		ucr->cmd_buf[i++] = data;

 		ucr->cmd_idx++;
 	}
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_add_cmd);

 int rtsx_usb_send_cmd(struct rtsx_ucr *ucr, u8 flag, int timeout)
 {
 	int ret;

 	ucr->cmd_buf[CNT_H] = (u8)(ucr->cmd_idx >> 8);
 	ucr->cmd_buf[CNT_L] = (u8)(ucr->cmd_idx);
 	ucr->cmd_buf[STAGE_FLAG] = flag;

 	ret = rtsx_usb_transfer_data(ucr,
 			usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
 			ucr->cmd_buf, ucr->cmd_idx * 4 + CMD_OFFSET,
 			0, NULL, timeout);
 	if (ret) {
 		rtsx_usb_clear_fsm_err(ucr);
 		return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_send_cmd);

 int rtsx_usb_get_rsp(struct rtsx_ucr *ucr, int rsp_len, int timeout)
 {
 	if (rsp_len <= 0)
 		return -EINVAL;

 	rsp_len = ALIGN(rsp_len, 4);

 	return rtsx_usb_transfer_data(ucr,
 			usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN),
 			ucr->rsp_buf, rsp_len, 0, NULL, timeout);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_get_rsp);

 static int rtsx_usb_get_status_with_bulk(struct rtsx_ucr *ucr, u16 *status)
 {
 	int ret;

 	rtsx_usb_init_cmd(ucr);
 	rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_EXIST, 0x00, 0x00);
 	rtsx_usb_add_cmd(ucr, READ_REG_CMD, OCPSTAT, 0x00, 0x00);
 	ret = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
 	if (ret)
 		return ret;

 	ret = rtsx_usb_get_rsp(ucr, 2, 100);
 	if (ret)
 		return ret;

 	*status = ((ucr->rsp_buf[0] >> 2) & 0x0f) |
 		  ((ucr->rsp_buf[1] & 0x03) << 4);

 	return 0;
 }

 int rtsx_usb_get_card_status(struct rtsx_ucr *ucr, u16 *status)
 {
 	int ret;
 	u16 *buf;

 	if (!status)
 		return -EINVAL;

 	if (polling_pipe == 0) {
 		buf = kzalloc(sizeof(u16), GFP_KERNEL);
 		if (!buf)
 			return -ENOMEM;

 		ret = usb_control_msg(ucr->pusb_dev,
 				usb_rcvctrlpipe(ucr->pusb_dev, 0),
 				RTSX_USB_REQ_POLL,
 				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 				0, 0, buf, 2, 100);
 		*status = *buf;

 		kfree(buf);
 	} else {
 		ret = rtsx_usb_get_status_with_bulk(ucr, status);
 	}

 	/* usb_control_msg may return positive when success */
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_get_card_status);

 static int rtsx_usb_write_phy_register(struct rtsx_ucr *ucr, u8 addr, u8 val)
 {
 	dev_dbg(&ucr->pusb_intf->dev, "Write 0x%x to phy register 0x%x\n",
 			val, addr);

 	rtsx_usb_init_cmd(ucr);

 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VSTAIN, 0xFF, val);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VCONTROL, 0xFF, addr & 0x0F);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x01);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VCONTROL,
 			0xFF, (addr >> 4) & 0x0F);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x01);

 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 }

 int rtsx_usb_write_register(struct rtsx_ucr *ucr, u16 addr, u8 mask, u8 data)
 {
 	rtsx_usb_init_cmd(ucr);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, addr, mask, data);
 	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_write_register);

 int rtsx_usb_read_register(struct rtsx_ucr *ucr, u16 addr, u8 *data)
 {
 	int ret;

 	if (data != NULL)
 		*data = 0;

 	rtsx_usb_init_cmd(ucr);
 	rtsx_usb_add_cmd(ucr, READ_REG_CMD, addr, 0, 0);
 	ret = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
 	if (ret)
 		return ret;

 	ret = rtsx_usb_get_rsp(ucr, 1, 100);
 	if (ret)
 		return ret;

 	if (data != NULL)
 		*data = ucr->rsp_buf[0];

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_read_register);

 static inline u8 double_ssc_depth(u8 depth)
 {
 	return (depth > 1) ? (depth - 1) : depth;
 }

 static u8 revise_ssc_depth(u8 ssc_depth, u8 div)
 {
 	if (div > CLK_DIV_1) {
 		if (ssc_depth > div - 1)
 			ssc_depth -= (div - 1);
 		else
 			ssc_depth = SSC_DEPTH_2M;
 	}

 	return ssc_depth;
 }

 int rtsx_usb_switch_clock(struct rtsx_ucr *ucr, unsigned int card_clock,
 		u8 ssc_depth, bool initial_mode, bool double_clk, bool vpclk)
 {
 	int ret;
 	u8 n, clk_divider, mcu_cnt, div;

 	if (!card_clock) {
 		ucr->cur_clk = 0;
 		return 0;
 	}

 	if (initial_mode) {
 		/* We use 250k(around) here, in initial stage */
 		clk_divider = SD_CLK_DIVIDE_128;
 		card_clock = 30000000;
 	} else {
 		clk_divider = SD_CLK_DIVIDE_0;
 	}

 	ret = rtsx_usb_write_register(ucr, SD_CFG1,
 			SD_CLK_DIVIDE_MASK, clk_divider);
 	if (ret < 0)
 		return ret;

 	card_clock /= 1000000;
 	dev_dbg(&ucr->pusb_intf->dev,
 			"Switch card clock to %dMHz\n", card_clock);

 	if (!initial_mode && double_clk)
 		card_clock *= 2;
 	dev_dbg(&ucr->pusb_intf->dev,
 			"Internal SSC clock: %dMHz (cur_clk = %d)\n",
 			card_clock, ucr->cur_clk);

 	if (card_clock == ucr->cur_clk)
 		return 0;

 	/* Converting clock value into internal settings: n and div */
 	n = card_clock - 2;
 	if ((card_clock <= 2) || (n > MAX_DIV_N))
 		return -EINVAL;

 	mcu_cnt = 60/card_clock + 3;
 	if (mcu_cnt > 15)
 		mcu_cnt = 15;

 	/* Make sure that the SSC clock div_n is not less than MIN_DIV_N */

 	div = CLK_DIV_1;
 	while (n < MIN_DIV_N && div < CLK_DIV_4) {
 		n = (n + 2) * 2 - 2;
 		div++;
 	}
 	dev_dbg(&ucr->pusb_intf->dev, "n = %d, div = %d\n", n, div);

 	if (double_clk)
 		ssc_depth = double_ssc_depth(ssc_depth);

 	ssc_depth = revise_ssc_depth(ssc_depth, div);
 	dev_dbg(&ucr->pusb_intf->dev, "ssc_depth = %d\n", ssc_depth);

 	rtsx_usb_init_cmd(ucr);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV,
 			0x3F, (div << 4) | mcu_cnt);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, 0);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL2,
 			SSC_DEPTH_MASK, ssc_depth);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_DIV_N_0, 0xFF, n);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, SSC_RSTB);
 	if (vpclk) {
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 				PHASE_NOT_RESET, 0);
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 				PHASE_NOT_RESET, PHASE_NOT_RESET);
 	}

 	ret = rtsx_usb_send_cmd(ucr, MODE_C, 2000);
 	if (ret < 0)
 		return ret;

 	ret = rtsx_usb_write_register(ucr, SSC_CTL1, 0xff,
 			SSC_RSTB | SSC_8X_EN | SSC_SEL_4M);
 	if (ret < 0)
 		return ret;

 	/* Wait SSC clock stable */
 	usleep_range(100, 1000);

 	ret = rtsx_usb_write_register(ucr, CLK_DIV, CLK_CHANGE, 0);
 	if (ret < 0)
 		return ret;

 	ucr->cur_clk = card_clock;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_switch_clock);

 int rtsx_usb_card_exclusive_check(struct rtsx_ucr *ucr, int card)
 {
 	int ret;
 	u16 val;
 	u16 cd_mask[] = {
 		[RTSX_USB_SD_CARD] = (CD_MASK & ~SD_CD),
 		[RTSX_USB_MS_CARD] = (CD_MASK & ~MS_CD)
 	};

 	ret = rtsx_usb_get_card_status(ucr, &val);
 	/*
 	 * If get status fails, return 0 (ok) for the exclusive check
 	 * and let the flow fail at somewhere else.
 	 */
 	if (ret)
 		return 0;

 	if (val & cd_mask[card])
 		return -EIO;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rtsx_usb_card_exclusive_check);

 static int rtsx_usb_reset_chip(struct rtsx_ucr *ucr)
 {
 	int ret;
 	u8 val;

 	rtsx_usb_init_cmd(ucr);

 	if (CHECK_PKG(ucr, LQFP48)) {
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
 				LDO3318_PWR_MASK, LDO_SUSPEND);
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
 				FORCE_LDO_POWERB, FORCE_LDO_POWERB);
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1,
 				0x30, 0x10);
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5,
 				0x03, 0x01);
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6,
 				0x0C, 0x04);
 	}

 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SYS_DUMMY0, NYET_MSAK, NYET_EN);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CD_DEGLITCH_WIDTH, 0xFF, 0x08);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 			CD_DEGLITCH_EN, XD_CD_DEGLITCH_EN, 0x0);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD30_DRIVE_SEL,
 			SD30_DRIVE_MASK, DRIVER_TYPE_D);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 			CARD_DRIVE_SEL, SD20_DRIVE_MASK, 0x0);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG, 0xE0, 0x0);

 	if (ucr->is_rts5179)
 		rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 				CARD_PULL_CTL5, 0x03, 0x01);

 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DMA1_CTL,
 		       EXTEND_DMA1_ASYNC_SIGNAL, EXTEND_DMA1_ASYNC_SIGNAL);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_INT_PEND,
 			XD_INT | MS_INT | SD_INT,
 			XD_INT | MS_INT | SD_INT);

 	ret = rtsx_usb_send_cmd(ucr, MODE_C, 100);
 	if (ret)
 		return ret;

 	/* config non-crystal mode */
 	rtsx_usb_read_register(ucr, CFG_MODE, &val);
 	if ((val & XTAL_FREE) || ((val & CLK_MODE_MASK) == CLK_MODE_NON_XTAL)) {
 		ret = rtsx_usb_write_phy_register(ucr, 0xC2, 0x7C);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static int rtsx_usb_init_chip(struct rtsx_ucr *ucr)
 {
 	int ret;
 	u8 val;

 	rtsx_usb_clear_fsm_err(ucr);

 	/* power on SSC */
 	ret = rtsx_usb_write_register(ucr,
 			FPDCTL, SSC_POWER_MASK, SSC_POWER_ON);
 	if (ret)
 		return ret;

 	usleep_range(100, 1000);
 	ret = rtsx_usb_write_register(ucr, CLK_DIV, CLK_CHANGE, 0x00);
 	if (ret)
 		return ret;

 	/* determine IC version */
 	ret = rtsx_usb_read_register(ucr, HW_VERSION, &val);
 	if (ret)
 		return ret;

 	ucr->ic_version = val & HW_VER_MASK;

 	/* determine package */
 	ret = rtsx_usb_read_register(ucr, CARD_SHARE_MODE, &val);
 	if (ret)
 		return ret;

 	if (val & CARD_SHARE_LQFP_SEL) {
 		ucr->package = LQFP48;
 		dev_dbg(&ucr->pusb_intf->dev, "Package: LQFP48\n");
 	} else {
 		ucr->package = QFN24;
 		dev_dbg(&ucr->pusb_intf->dev, "Package: QFN24\n");
 	}

 	/* determine IC variations */
 	rtsx_usb_read_register(ucr, CFG_MODE_1, &val);
 	if (val & RTS5179) {
 		ucr->is_rts5179 = true;
 		dev_dbg(&ucr->pusb_intf->dev, "Device is rts5179\n");
 	} else {
 		ucr->is_rts5179 = false;
 	}

 	return rtsx_usb_reset_chip(ucr);
 }

 static int rtsx_usb_probe(struct usb_interface *intf,
 			 const struct usb_device_id *id)
 {
 	struct usb_device *usb_dev = interface_to_usbdev(intf);
 	struct rtsx_ucr *ucr;
 	int ret;

 	dev_dbg(&intf->dev,
 		": Realtek USB Card Reader found at bus %03d address %03d\n",
 		 usb_dev->bus->busnum, usb_dev->devnum);

 	ucr = devm_kzalloc(&intf->dev, sizeof(*ucr), GFP_KERNEL);
 	if (!ucr)
 		return -ENOMEM;

 	ucr->pusb_dev = usb_dev;

 	ucr->iobuf = usb_alloc_coherent(ucr->pusb_dev, IOBUF_SIZE,
 			GFP_KERNEL, &ucr->iobuf_dma);
 	if (!ucr->iobuf)
 		return -ENOMEM;

 	usb_set_intfdata(intf, ucr);

 	ucr->vendor_id = id->idVendor;
 	ucr->product_id = id->idProduct;
 	ucr->cmd_buf = ucr->rsp_buf = ucr->iobuf;

 	mutex_init(&ucr->dev_mutex);

 	ucr->pusb_intf = intf;

 	/* initialize */
 	ret = rtsx_usb_init_chip(ucr);
 	if (ret)
 		goto out_init_fail;

 	/* initialize USB SG transfer timer */
 	setup_timer(&ucr->sg_timer, rtsx_usb_sg_timed_out, (unsigned long) ucr);

 	ret = mfd_add_hotplug_devices(&intf->dev, rtsx_usb_cells,
 				      ARRAY_SIZE(rtsx_usb_cells));
 	if (ret)
 		goto out_init_fail;

 #ifdef CONFIG_PM
 	intf->needs_remote_wakeup = 1;
 	usb_enable_autosuspend(usb_dev);
 #endif

 	return 0;

 out_init_fail:
 	usb_free_coherent(ucr->pusb_dev, IOBUF_SIZE, ucr->iobuf,
 			ucr->iobuf_dma);
 	return ret;
 }

 static void rtsx_usb_disconnect(struct usb_interface *intf)
 {
 	struct rtsx_ucr *ucr = (struct rtsx_ucr *)usb_get_intfdata(intf);

 	dev_dbg(&intf->dev, "%s called\n", __func__);

 	mfd_remove_devices(&intf->dev);

 	usb_set_intfdata(ucr->pusb_intf, NULL);
 	usb_free_coherent(ucr->pusb_dev, IOBUF_SIZE, ucr->iobuf,
 			ucr->iobuf_dma);
 }

 #ifdef CONFIG_PM
 static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct rtsx_ucr *ucr =
 		(struct rtsx_ucr *)usb_get_intfdata(intf);
 	u16 val = 0;

 	dev_dbg(&intf->dev, "%s called with pm message 0x%04x\n",
 			__func__, message.event);

 	if (PMSG_IS_AUTO(message)) {
 		if (mutex_trylock(&ucr->dev_mutex)) {
 			rtsx_usb_get_card_status(ucr, &val);
 			mutex_unlock(&ucr->dev_mutex);

 			/* Defer the autosuspend if card exists */
 			if (val & (SD_CD | MS_CD))
 				return -EAGAIN;
 		} else {
 			/* There is an ongoing operation*/
 			return -EAGAIN;
 		}
 	}

 	return 0;
 }

 static int rtsx_usb_resume(struct usb_interface *intf)
 {
 	return 0;
 }

 static int rtsx_usb_reset_resume(struct usb_interface *intf)
 {
 	struct rtsx_ucr *ucr =
 		(struct rtsx_ucr *)usb_get_intfdata(intf);

 	rtsx_usb_reset_chip(ucr);
 	return 0;
 }

 #else /* CONFIG_PM */

 #define rtsx_usb_suspend NULL
 #define rtsx_usb_resume NULL
 #define rtsx_usb_reset_resume NULL

 #endif /* CONFIG_PM */


 static int rtsx_usb_pre_reset(struct usb_interface *intf)
 {
 	struct rtsx_ucr *ucr = (struct rtsx_ucr *)usb_get_intfdata(intf);

 	mutex_lock(&ucr->dev_mutex);
 	return 0;
 }

 static int rtsx_usb_post_reset(struct usb_interface *intf)
 {
 	struct rtsx_ucr *ucr = (struct rtsx_ucr *)usb_get_intfdata(intf);

 	mutex_unlock(&ucr->dev_mutex);
 	return 0;
 }

 static struct usb_device_id rtsx_usb_usb_ids[] = {
 	{ USB_DEVICE(0x0BDA, 0x0129) },
 	{ USB_DEVICE(0x0BDA, 0x0139) },
 	{ USB_DEVICE(0x0BDA, 0x0140) },
 	{ }
 };
 MODULE_DEVICE_TABLE(usb, rtsx_usb_usb_ids);

 static struct usb_driver rtsx_usb_driver = {
 	.name			= "rtsx_usb",
 	.probe			= rtsx_usb_probe,
 	.disconnect		= rtsx_usb_disconnect,
 	.suspend		= rtsx_usb_suspend,
 	.resume			= rtsx_usb_resume,
 	.reset_resume		= rtsx_usb_reset_resume,
 	.pre_reset		= rtsx_usb_pre_reset,
 	.post_reset		= rtsx_usb_post_reset,
 	.id_table		= rtsx_usb_usb_ids,
 	.supports_autosuspend	= 1,
 	.soft_unbind		= 1,
 };

 module_usb_driver(rtsx_usb_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
 MODULE_DESCRIPTION("Realtek USB Card Reader Driver");
	/* Driver for Realtek USB card reader
	*
	* Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2
	* as published by the Free Software Foundation.
	*
	* 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/>.
	*
	* Author:
	* Roger Tseng <rogerable@realtek.com>
	*/
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/mutex.h>
	#include <linux/usb.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/rtsx_usb.h>

	static int polling_pipe = 1;
	module_param(polling_pipe, int, S_IRUGO \| S_IWUSR);
	MODULE_PARM_DESC(polling_pipe, "polling pipe (0: ctl, 1: bulk)");

	static const struct mfd_cell rtsx_usb_cells[] = {
	[RTSX_USB_SD_CARD] = {
	.name = "rtsx_usb_sdmmc",
	.pdata_size = 0,
	},
	[RTSX_USB_MS_CARD] = {
	.name = "rtsx_usb_ms",
	.pdata_size = 0,
	},
	};

	static void rtsx_usb_sg_timed_out(unsigned long data)
	{
	struct rtsx_ucr ucr = (struct rtsx_ucr )data;

	dev_dbg(&ucr->pusb_intf->dev, "%s: sg transfer timed out", __func__);
	usb_sg_cancel(&ucr->current_sg);

	/* we know the cancellation is caused by time-out */
	ucr->current_sg.status = -ETIMEDOUT;
	}

	static int rtsx_usb_bulk_transfer_sglist(struct rtsx_ucr *ucr,
	unsigned int pipe, struct scatterlist *sg, int num_sg,
	unsigned int length, unsigned int *act_len, int timeout)
	{
	int ret;

	dev_dbg(&ucr->pusb_intf->dev, "%s: xfer %u bytes, %d entries\n",
	__func__, length, num_sg);
	ret = usb_sg_init(&ucr->current_sg, ucr->pusb_dev, pipe, 0,
	sg, num_sg, length, GFP_NOIO);
	if (ret)
	return ret;

	ucr->sg_timer.expires = jiffies + msecs_to_jiffies(timeout);
	add_timer(&ucr->sg_timer);
	usb_sg_wait(&ucr->current_sg);
	del_timer_sync(&ucr->sg_timer);

	if (act_len)
	*act_len = ucr->current_sg.bytes;

	return ucr->current_sg.status;
	}

	int rtsx_usb_transfer_data(struct rtsx_ucr *ucr, unsigned int pipe,
	void *buf, unsigned int len, int num_sg,
	unsigned int *act_len, int timeout)
	{
	if (timeout < 600)
	timeout = 600;

	if (num_sg)
	return rtsx_usb_bulk_transfer_sglist(ucr, pipe,
	(struct scatterlist *)buf, num_sg, len, act_len,
	timeout);
	else
	return usb_bulk_msg(ucr->pusb_dev, pipe, buf, len, act_len,
	timeout);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_transfer_data);

	static inline void rtsx_usb_seq_cmd_hdr(struct rtsx_ucr *ucr,
	u16 addr, u16 len, u8 seq_type)
	{
	rtsx_usb_cmd_hdr_tag(ucr);

	ucr->cmd_buf[PACKET_TYPE] = seq_type;
	ucr->cmd_buf[5] = (u8)(len >> 8);
	ucr->cmd_buf[6] = (u8)len;
	ucr->cmd_buf[8] = (u8)(addr >> 8);
	ucr->cmd_buf[9] = (u8)addr;

	if (seq_type == SEQ_WRITE)
	ucr->cmd_buf[STAGE_FLAG] = 0;
	else
	ucr->cmd_buf[STAGE_FLAG] = STAGE_R;
	}

	static int rtsx_usb_seq_write_register(struct rtsx_ucr *ucr,
	u16 addr, u16 len, u8 *data)
	{
	u16 cmd_len = ALIGN(SEQ_WRITE_DATA_OFFSET + len, 4);

	if (!data)
	return -EINVAL;

	if (cmd_len > IOBUF_SIZE)
	return -EINVAL;

	rtsx_usb_seq_cmd_hdr(ucr, addr, len, SEQ_WRITE);
	memcpy(ucr->cmd_buf + SEQ_WRITE_DATA_OFFSET, data, len);

	return rtsx_usb_transfer_data(ucr,
	usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
	ucr->cmd_buf, cmd_len, 0, NULL, 100);
	}

	static int rtsx_usb_seq_read_register(struct rtsx_ucr *ucr,
	u16 addr, u16 len, u8 *data)
	{
	int i, ret;
	u16 rsp_len = round_down(len, 4);
	u16 res_len = len - rsp_len;

	if (!data)
	return -EINVAL;

	/* 4-byte aligned part */
	if (rsp_len) {
	rtsx_usb_seq_cmd_hdr(ucr, addr, len, SEQ_READ);
	ret = rtsx_usb_transfer_data(ucr,
	usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
	ucr->cmd_buf, 12, 0, NULL, 100);
	if (ret)
	return ret;

	ret = rtsx_usb_transfer_data(ucr,
	usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN),
	data, rsp_len, 0, NULL, 100);
	if (ret)
	return ret;
	}

	/* unaligned part */
	for (i = 0; i < res_len; i++) {
	ret = rtsx_usb_read_register(ucr, addr + rsp_len + i,
	data + rsp_len + i);
	if (ret)
	return ret;
	}

	return 0;
	}

	int rtsx_usb_read_ppbuf(struct rtsx_ucr ucr, u8 buf, int buf_len)
	{
	return rtsx_usb_seq_read_register(ucr, PPBUF_BASE2, (u16)buf_len, buf);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_read_ppbuf);

	int rtsx_usb_write_ppbuf(struct rtsx_ucr ucr, u8 buf, int buf_len)
	{
	return rtsx_usb_seq_write_register(ucr, PPBUF_BASE2, (u16)buf_len, buf);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_write_ppbuf);

	int rtsx_usb_ep0_write_register(struct rtsx_ucr *ucr, u16 addr,
	u8 mask, u8 data)
	{
	u16 value, index;

	addr \|= EP0_WRITE_REG_CMD << EP0_OP_SHIFT;
	value = swab16(addr);
	index = mask \| data << 8;

	return usb_control_msg(ucr->pusb_dev,
	usb_sndctrlpipe(ucr->pusb_dev, 0), RTSX_USB_REQ_REG_OP,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, index, NULL, 0, 100);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_ep0_write_register);

	int rtsx_usb_ep0_read_register(struct rtsx_ucr ucr, u16 addr, u8 data)
	{
	u16 value;
	u8 *buf;
	int ret;

	if (!data)
	return -EINVAL;

	buf = kzalloc(sizeof(u8), GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	addr \|= EP0_READ_REG_CMD << EP0_OP_SHIFT;
	value = swab16(addr);

	ret = usb_control_msg(ucr->pusb_dev,
	usb_rcvctrlpipe(ucr->pusb_dev, 0), RTSX_USB_REQ_REG_OP,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, 0, buf, 1, 100);
	data = buf;

	kfree(buf);
	return ret;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_ep0_read_register);

	void rtsx_usb_add_cmd(struct rtsx_ucr *ucr, u8 cmd_type, u16 reg_addr,
	u8 mask, u8 data)
	{
	int i;

	if (ucr->cmd_idx < (IOBUF_SIZE - CMD_OFFSET) / 4) {
	i = CMD_OFFSET + ucr->cmd_idx * 4;

	ucr->cmd_buf[i++] = ((cmd_type & 0x03) << 6) \|
	(u8)((reg_addr >> 8) & 0x3F);
	ucr->cmd_buf[i++] = (u8)reg_addr;
	ucr->cmd_buf[i++] = mask;
	ucr->cmd_buf[i++] = data;

	ucr->cmd_idx++;
	}
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_add_cmd);

	int rtsx_usb_send_cmd(struct rtsx_ucr *ucr, u8 flag, int timeout)
	{
	int ret;

	ucr->cmd_buf[CNT_H] = (u8)(ucr->cmd_idx >> 8);
	ucr->cmd_buf[CNT_L] = (u8)(ucr->cmd_idx);
	ucr->cmd_buf[STAGE_FLAG] = flag;

	ret = rtsx_usb_transfer_data(ucr,
	usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT),
	ucr->cmd_buf, ucr->cmd_idx * 4 + CMD_OFFSET,
	0, NULL, timeout);
	if (ret) {
	rtsx_usb_clear_fsm_err(ucr);
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_send_cmd);

	int rtsx_usb_get_rsp(struct rtsx_ucr *ucr, int rsp_len, int timeout)
	{
	if (rsp_len <= 0)
	return -EINVAL;

	rsp_len = ALIGN(rsp_len, 4);

	return rtsx_usb_transfer_data(ucr,
	usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN),
	ucr->rsp_buf, rsp_len, 0, NULL, timeout);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_get_rsp);

	static int rtsx_usb_get_status_with_bulk(struct rtsx_ucr ucr, u16 status)
	{
	int ret;

	rtsx_usb_init_cmd(ucr);
	rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_EXIST, 0x00, 0x00);
	rtsx_usb_add_cmd(ucr, READ_REG_CMD, OCPSTAT, 0x00, 0x00);
	ret = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
	if (ret)
	return ret;

	ret = rtsx_usb_get_rsp(ucr, 2, 100);
	if (ret)
	return ret;

	*status = ((ucr->rsp_buf[0] >> 2) & 0x0f) \|
	((ucr->rsp_buf[1] & 0x03) << 4);

	return 0;
	}

	int rtsx_usb_get_card_status(struct rtsx_ucr ucr, u16 status)
	{
	int ret;
	u16 *buf;

	if (!status)
	return -EINVAL;

	if (polling_pipe == 0) {
	buf = kzalloc(sizeof(u16), GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	ret = usb_control_msg(ucr->pusb_dev,
	usb_rcvctrlpipe(ucr->pusb_dev, 0),
	RTSX_USB_REQ_POLL,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	0, 0, buf, 2, 100);
	status = buf;

	kfree(buf);
	} else {
	ret = rtsx_usb_get_status_with_bulk(ucr, status);
	}

	/* usb_control_msg may return positive when success */
	if (ret < 0)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_get_card_status);

	static int rtsx_usb_write_phy_register(struct rtsx_ucr *ucr, u8 addr, u8 val)
	{
	dev_dbg(&ucr->pusb_intf->dev, "Write 0x%x to phy register 0x%x\n",
	val, addr);

	rtsx_usb_init_cmd(ucr);

	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VSTAIN, 0xFF, val);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VCONTROL, 0xFF, addr & 0x0F);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x01);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VCONTROL,
	0xFF, (addr >> 4) & 0x0F);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x00);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, HS_VLOADM, 0xFF, 0x01);

	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
	}

	int rtsx_usb_write_register(struct rtsx_ucr *ucr, u16 addr, u8 mask, u8 data)
	{
	rtsx_usb_init_cmd(ucr);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, addr, mask, data);
	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_write_register);

	int rtsx_usb_read_register(struct rtsx_ucr ucr, u16 addr, u8 data)
	{
	int ret;

	if (data != NULL)
	*data = 0;

	rtsx_usb_init_cmd(ucr);
	rtsx_usb_add_cmd(ucr, READ_REG_CMD, addr, 0, 0);
	ret = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
	if (ret)
	return ret;

	ret = rtsx_usb_get_rsp(ucr, 1, 100);
	if (ret)
	return ret;

	if (data != NULL)
	*data = ucr->rsp_buf[0];

	return 0;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_read_register);

	static inline u8 double_ssc_depth(u8 depth)
	{
	return (depth > 1) ? (depth - 1) : depth;
	}

	static u8 revise_ssc_depth(u8 ssc_depth, u8 div)
	{
	if (div > CLK_DIV_1) {
	if (ssc_depth > div - 1)
	ssc_depth -= (div - 1);
	else
	ssc_depth = SSC_DEPTH_2M;
	}

	return ssc_depth;
	}

	int rtsx_usb_switch_clock(struct rtsx_ucr *ucr, unsigned int card_clock,
	u8 ssc_depth, bool initial_mode, bool double_clk, bool vpclk)
	{
	int ret;
	u8 n, clk_divider, mcu_cnt, div;

	if (!card_clock) {
	ucr->cur_clk = 0;
	return 0;
	}

	if (initial_mode) {
	/* We use 250k(around) here, in initial stage */
	clk_divider = SD_CLK_DIVIDE_128;
	card_clock = 30000000;
	} else {
	clk_divider = SD_CLK_DIVIDE_0;
	}

	ret = rtsx_usb_write_register(ucr, SD_CFG1,
	SD_CLK_DIVIDE_MASK, clk_divider);
	if (ret < 0)
	return ret;

	card_clock /= 1000000;
	dev_dbg(&ucr->pusb_intf->dev,
	"Switch card clock to %dMHz\n", card_clock);

	if (!initial_mode && double_clk)
	card_clock *= 2;
	dev_dbg(&ucr->pusb_intf->dev,
	"Internal SSC clock: %dMHz (cur_clk = %d)\n",
	card_clock, ucr->cur_clk);

	if (card_clock == ucr->cur_clk)
	return 0;

	/* Converting clock value into internal settings: n and div */
	n = card_clock - 2;
	if ((card_clock <= 2) \|\| (n > MAX_DIV_N))
	return -EINVAL;

	mcu_cnt = 60/card_clock + 3;
	if (mcu_cnt > 15)
	mcu_cnt = 15;

	/* Make sure that the SSC clock div_n is not less than MIN_DIV_N */

	div = CLK_DIV_1;
	while (n < MIN_DIV_N && div < CLK_DIV_4) {
	n = (n + 2) * 2 - 2;
	div++;
	}
	dev_dbg(&ucr->pusb_intf->dev, "n = %d, div = %d\n", n, div);

	if (double_clk)
	ssc_depth = double_ssc_depth(ssc_depth);

	ssc_depth = revise_ssc_depth(ssc_depth, div);
	dev_dbg(&ucr->pusb_intf->dev, "ssc_depth = %d\n", ssc_depth);

	rtsx_usb_init_cmd(ucr);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV,
	0x3F, (div << 4) \| mcu_cnt);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, 0);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL2,
	SSC_DEPTH_MASK, ssc_depth);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_DIV_N_0, 0xFF, n);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, SSC_RSTB);
	if (vpclk) {
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
	PHASE_NOT_RESET, 0);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
	PHASE_NOT_RESET, PHASE_NOT_RESET);
	}

	ret = rtsx_usb_send_cmd(ucr, MODE_C, 2000);
	if (ret < 0)
	return ret;

	ret = rtsx_usb_write_register(ucr, SSC_CTL1, 0xff,
	SSC_RSTB \| SSC_8X_EN \| SSC_SEL_4M);
	if (ret < 0)
	return ret;

	/* Wait SSC clock stable */
	usleep_range(100, 1000);

	ret = rtsx_usb_write_register(ucr, CLK_DIV, CLK_CHANGE, 0);
	if (ret < 0)
	return ret;

	ucr->cur_clk = card_clock;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_switch_clock);

	int rtsx_usb_card_exclusive_check(struct rtsx_ucr *ucr, int card)
	{
	int ret;
	u16 val;
	u16 cd_mask[] = {
	[RTSX_USB_SD_CARD] = (CD_MASK & ~SD_CD),
	[RTSX_USB_MS_CARD] = (CD_MASK & ~MS_CD)
	};

	ret = rtsx_usb_get_card_status(ucr, &val);
	/*
	* If get status fails, return 0 (ok) for the exclusive check
	* and let the flow fail at somewhere else.
	*/
	if (ret)
	return 0;

	if (val & cd_mask[card])
	return -EIO;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rtsx_usb_card_exclusive_check);

	static int rtsx_usb_reset_chip(struct rtsx_ucr *ucr)
	{
	int ret;
	u8 val;

	rtsx_usb_init_cmd(ucr);

	if (CHECK_PKG(ucr, LQFP48)) {
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
	LDO3318_PWR_MASK, LDO_SUSPEND);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
	FORCE_LDO_POWERB, FORCE_LDO_POWERB);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1,
	0x30, 0x10);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5,
	0x03, 0x01);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6,
	0x0C, 0x04);
	}

	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SYS_DUMMY0, NYET_MSAK, NYET_EN);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CD_DEGLITCH_WIDTH, 0xFF, 0x08);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
	CD_DEGLITCH_EN, XD_CD_DEGLITCH_EN, 0x0);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD30_DRIVE_SEL,
	SD30_DRIVE_MASK, DRIVER_TYPE_D);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
	CARD_DRIVE_SEL, SD20_DRIVE_MASK, 0x0);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG, 0xE0, 0x0);

	if (ucr->is_rts5179)
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
	CARD_PULL_CTL5, 0x03, 0x01);

	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DMA1_CTL,
	EXTEND_DMA1_ASYNC_SIGNAL, EXTEND_DMA1_ASYNC_SIGNAL);
	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_INT_PEND,
	XD_INT \| MS_INT \| SD_INT,
	XD_INT \| MS_INT \| SD_INT);

	ret = rtsx_usb_send_cmd(ucr, MODE_C, 100);
	if (ret)
	return ret;

	/* config non-crystal mode */
	rtsx_usb_read_register(ucr, CFG_MODE, &val);
	if ((val & XTAL_FREE) \|\| ((val & CLK_MODE_MASK) == CLK_MODE_NON_XTAL)) {
	ret = rtsx_usb_write_phy_register(ucr, 0xC2, 0x7C);
	if (ret)
	return ret;
	}

	return 0;
	}

	static int rtsx_usb_init_chip(struct rtsx_ucr *ucr)
	{
	int ret;
	u8 val;

	rtsx_usb_clear_fsm_err(ucr);

	/* power on SSC */
	ret = rtsx_usb_write_register(ucr,
	FPDCTL, SSC_POWER_MASK, SSC_POWER_ON);
	if (ret)
	return ret;

	usleep_range(100, 1000);
	ret = rtsx_usb_write_register(ucr, CLK_DIV, CLK_CHANGE, 0x00);
	if (ret)
	return ret;

	/* determine IC version */
	ret = rtsx_usb_read_register(ucr, HW_VERSION, &val);
	if (ret)
	return ret;

	ucr->ic_version = val & HW_VER_MASK;

	/* determine package */
	ret = rtsx_usb_read_register(ucr, CARD_SHARE_MODE, &val);
	if (ret)
	return ret;

	if (val & CARD_SHARE_LQFP_SEL) {
	ucr->package = LQFP48;
	dev_dbg(&ucr->pusb_intf->dev, "Package: LQFP48\n");
	} else {
	ucr->package = QFN24;
	dev_dbg(&ucr->pusb_intf->dev, "Package: QFN24\n");
	}

	/* determine IC variations */
	rtsx_usb_read_register(ucr, CFG_MODE_1, &val);
	if (val & RTS5179) {
	ucr->is_rts5179 = true;
	dev_dbg(&ucr->pusb_intf->dev, "Device is rts5179\n");
	} else {
	ucr->is_rts5179 = false;
	}

	return rtsx_usb_reset_chip(ucr);
	}

	static int rtsx_usb_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct rtsx_ucr *ucr;
	int ret;

	dev_dbg(&intf->dev,
	": Realtek USB Card Reader found at bus %03d address %03d\n",
	usb_dev->bus->busnum, usb_dev->devnum);

	ucr = devm_kzalloc(&intf->dev, sizeof(*ucr), GFP_KERNEL);
	if (!ucr)
	return -ENOMEM;

	ucr->pusb_dev = usb_dev;

	ucr->iobuf = usb_alloc_coherent(ucr->pusb_dev, IOBUF_SIZE,
	GFP_KERNEL, &ucr->iobuf_dma);
	if (!ucr->iobuf)
	return -ENOMEM;

	usb_set_intfdata(intf, ucr);

	ucr->vendor_id = id->idVendor;
	ucr->product_id = id->idProduct;
	ucr->cmd_buf = ucr->rsp_buf = ucr->iobuf;

	mutex_init(&ucr->dev_mutex);

	ucr->pusb_intf = intf;

	/* initialize */
	ret = rtsx_usb_init_chip(ucr);
	if (ret)
	goto out_init_fail;

	/* initialize USB SG transfer timer */
	setup_timer(&ucr->sg_timer, rtsx_usb_sg_timed_out, (unsigned long) ucr);

	ret = mfd_add_hotplug_devices(&intf->dev, rtsx_usb_cells,
	ARRAY_SIZE(rtsx_usb_cells));
	if (ret)
	goto out_init_fail;

	#ifdef CONFIG_PM
	intf->needs_remote_wakeup = 1;
	usb_enable_autosuspend(usb_dev);
	#endif

	return 0;

	out_init_fail:
	usb_free_coherent(ucr->pusb_dev, IOBUF_SIZE, ucr->iobuf,
	ucr->iobuf_dma);
	return ret;
	}

	static void rtsx_usb_disconnect(struct usb_interface *intf)
	{
	struct rtsx_ucr ucr = (struct rtsx_ucr )usb_get_intfdata(intf);

	dev_dbg(&intf->dev, "%s called\n", __func__);

	mfd_remove_devices(&intf->dev);

	usb_set_intfdata(ucr->pusb_intf, NULL);
	usb_free_coherent(ucr->pusb_dev, IOBUF_SIZE, ucr->iobuf,
	ucr->iobuf_dma);
	}

	#ifdef CONFIG_PM
	static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
	{
	struct rtsx_ucr *ucr =
	(struct rtsx_ucr *)usb_get_intfdata(intf);
	u16 val = 0;

	dev_dbg(&intf->dev, "%s called with pm message 0x%04x\n",
	__func__, message.event);

	if (PMSG_IS_AUTO(message)) {
	if (mutex_trylock(&ucr->dev_mutex)) {
	rtsx_usb_get_card_status(ucr, &val);
	mutex_unlock(&ucr->dev_mutex);

	/* Defer the autosuspend if card exists */
	if (val & (SD_CD \| MS_CD))
	return -EAGAIN;
	} else {
	/* There is an ongoing operation*/
	return -EAGAIN;
	}
	}

	return 0;
	}

	static int rtsx_usb_resume(struct usb_interface *intf)
	{
	return 0;
	}

	static int rtsx_usb_reset_resume(struct usb_interface *intf)
	{
	struct rtsx_ucr *ucr =
	(struct rtsx_ucr *)usb_get_intfdata(intf);

	rtsx_usb_reset_chip(ucr);
	return 0;
	}

	#else /* CONFIG_PM */

	#define rtsx_usb_suspend NULL
	#define rtsx_usb_resume NULL
	#define rtsx_usb_reset_resume NULL

	#endif /* CONFIG_PM */


	static int rtsx_usb_pre_reset(struct usb_interface *intf)
	{
	struct rtsx_ucr ucr = (struct rtsx_ucr )usb_get_intfdata(intf);

	mutex_lock(&ucr->dev_mutex);
	return 0;
	}

	static int rtsx_usb_post_reset(struct usb_interface *intf)
	{
	struct rtsx_ucr ucr = (struct rtsx_ucr )usb_get_intfdata(intf);

	mutex_unlock(&ucr->dev_mutex);
	return 0;
	}

	static struct usb_device_id rtsx_usb_usb_ids[] = {
	{ USB_DEVICE(0x0BDA, 0x0129) },
	{ USB_DEVICE(0x0BDA, 0x0139) },
	{ USB_DEVICE(0x0BDA, 0x0140) },
	{ }
	};
	MODULE_DEVICE_TABLE(usb, rtsx_usb_usb_ids);

	static struct usb_driver rtsx_usb_driver = {
	.name = "rtsx_usb",
	.probe = rtsx_usb_probe,
	.disconnect = rtsx_usb_disconnect,
	.suspend = rtsx_usb_suspend,
	.resume = rtsx_usb_resume,
	.reset_resume = rtsx_usb_reset_resume,
	.pre_reset = rtsx_usb_pre_reset,
	.post_reset = rtsx_usb_post_reset,
	.id_table = rtsx_usb_usb_ids,
	.supports_autosuspend = 1,
	.soft_unbind = 1,
	};

	module_usb_driver(rtsx_usb_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
	MODULE_DESCRIPTION("Realtek USB Card Reader Driver");