staging: r8712u: Add the new driver to the mainline kernel

This code is for a completely new version of the Realtek 8192 USB devices
such as the D-Link DWA-130. The Realtek code, which was originally for
Linux, Windows XP and Windows CE, has been stripped of all code not needed
for Linux. In addition, only one additional configuration variable, which
enables AP mode, remains.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Tested-by: Frederic Leroy <fredo@starox.org>

1 files changed, 233 insertions, 0 deletions

diff --git a/drivers/staging/rtl8712/rtl871x_eeprom.c b/drivers/staging/rtl8712/rtl871x_eeprom.c
new file mode 100644
index 000000000000..2f145d63fcec
--- /dev/null
+++ b/drivers/staging/rtl8712/rtl871x_eeprom.c
@@ -0,0 +1,233 @@
+/******************************************************************************
+ * rtl871x_eeprom.c
+ *
+ * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
+ * Linux device driver for RTL8192SU
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * Modifications for inclusion into the Linux staging tree are
+ * Copyright(c) 2010 Larry Finger. All rights reserved.
+ *
+ * Contact information:
+ * WLAN FAE <wlanfae@realtek.com>
+ * Larry Finger <Larry.Finger@lwfinger.net>
+ *
+ ******************************************************************************/
+
+#define _RTL871X_EEPROM_C_
+
+#include "osdep_service.h"
+#include "drv_types.h"
+
+static void up_clk(struct _adapter *padapter, u16 *x)
+{
+	*x = *x | _EESK;
+	r8712_write8(padapter, EE_9346CR, (u8)*x);
+	udelay(CLOCK_RATE);
+}
+
+static void down_clk(struct _adapter *padapter, u16 *x)
+{
+	*x = *x & ~_EESK;
+	r8712_write8(padapter, EE_9346CR, (u8)*x);
+	udelay(CLOCK_RATE);
+}
+
+static void shift_out_bits(struct _adapter *padapter, u16 data, u16 count)
+{
+	u16 x, mask;
+
+	if (padapter->bSurpriseRemoved == true)
+		goto out;
+	mask = 0x01 << (count - 1);
+	x = r8712_read8(padapter, EE_9346CR);
+	x &= ~(_EEDO | _EEDI);
+	do {
+		x &= ~_EEDI;
+		if (data & mask)
+			x |= _EEDI;
+		if (padapter->bSurpriseRemoved == true)
+			goto out;
+		r8712_write8(padapter, EE_9346CR, (u8)x);
+		udelay(CLOCK_RATE);
+		up_clk(padapter, &x);
+		down_clk(padapter, &x);
+		mask = mask >> 1;
+	} while (mask);
+	if (padapter->bSurpriseRemoved == true)
+		goto out;
+	x &= ~_EEDI;
+	r8712_write8(padapter, EE_9346CR, (u8)x);
+out:;
+}
+
+static u16 shift_in_bits(struct _adapter *padapter)
+{
+	u16 x, d = 0, i;
+
+	if (padapter->bSurpriseRemoved == true)
+		goto out;
+	x = r8712_read8(padapter, EE_9346CR);
+	x &= ~(_EEDO | _EEDI);
+	d = 0;
+	for (i = 0; i < 16; i++) {
+		d = d << 1;
+		up_clk(padapter, &x);
+		if (padapter->bSurpriseRemoved == true)
+			goto out;
+		x = r8712_read8(padapter, EE_9346CR);
+		x &= ~(_EEDI);
+		if (x & _EEDO)
+			d |= 1;
+		down_clk(padapter, &x);
+	}
+out:
+	return d;
+}
+
+static void standby(struct _adapter *padapter)
+{
+	u8   x;
+
+	x = r8712_read8(padapter, EE_9346CR);
+	x &= ~(_EECS | _EESK);
+	r8712_write8(padapter, EE_9346CR, x);
+	udelay(CLOCK_RATE);
+	x |= _EECS;
+	r8712_write8(padapter, EE_9346CR, x);
+	udelay(CLOCK_RATE);
+}
+
+static u16 wait_eeprom_cmd_done(struct _adapter *padapter)
+{
+	u8	x;
+	u16	i;
+
+	standby(padapter);
+	for (i = 0; i < 200; i++) {
+		x = r8712_read8(padapter, EE_9346CR);
+		if (x & _EEDO)
+			return true;
+		udelay(CLOCK_RATE);
+	}
+	return false;
+}
+
+static void eeprom_clean(struct _adapter *padapter)
+{
+	u16 x;
+
+	if (padapter->bSurpriseRemoved == true)
+		return;
+	x = r8712_read8(padapter, EE_9346CR);
+	if (padapter->bSurpriseRemoved == true)
+		return;
+	x &= ~(_EECS | _EEDI);
+	r8712_write8(padapter, EE_9346CR, (u8)x);
+	if (padapter->bSurpriseRemoved == true)
+		return;
+	up_clk(padapter, &x);
+	if (padapter->bSurpriseRemoved == true)
+		return;
+	down_clk(padapter, &x);
+}
+
+void r8712_eeprom_write16(struct _adapter *padapter, u16 reg, u16 data)
+{
+	u8 x;
+	u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
+
+	tmp8_ori = r8712_read8(padapter, 0x102502f1);
+	tmp8_new = tmp8_ori & 0xf7;
+	if (tmp8_ori != tmp8_new)
+		r8712_write8(padapter, 0x102502f1, tmp8_new);
+	tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
+	tmp8_clk_new = tmp8_clk_ori | 0x20;
+	if (tmp8_clk_new != tmp8_clk_ori)
+		r8712_write8(padapter, 0x10250003, tmp8_clk_new);
+	x = r8712_read8(padapter, EE_9346CR);
+	x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
+	x |= _EEM1 | _EECS;
+	r8712_write8(padapter, EE_9346CR, x);
+	shift_out_bits(padapter, EEPROM_EWEN_OPCODE, 5);
+	if (padapter->EepromAddressSize == 8)	/*CF+ and SDIO*/
+		shift_out_bits(padapter, 0, 6);
+	else	/* USB */
+		shift_out_bits(padapter, 0, 4);
+	standby(padapter);
+	/* Erase this particular word.  Write the erase opcode and register
+	 * number in that order. The opcode is 3bits in length; reg is 6
+	 * bits long.
+	 */
+	standby(padapter);
+	/* write the new word to the EEPROM
+	 * send the write opcode the EEPORM
+	 */
+	shift_out_bits(padapter, EEPROM_WRITE_OPCODE, 3);
+	/* select which word in the EEPROM that we are writing to. */
+	shift_out_bits(padapter, reg, padapter->EepromAddressSize);
+	/* write the data to the selected EEPROM word. */
+	shift_out_bits(padapter, data, 16);
+	if (wait_eeprom_cmd_done(padapter)) {
+		standby(padapter);
+		shift_out_bits(padapter, EEPROM_EWDS_OPCODE, 5);
+		shift_out_bits(padapter, reg, 4);
+		eeprom_clean(padapter);
+	}
+	if (tmp8_clk_new != tmp8_clk_ori)
+		r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
+	if (tmp8_new != tmp8_ori)
+		r8712_write8(padapter, 0x102502f1, tmp8_ori);
+}
+
+u16 r8712_eeprom_read16(struct _adapter *padapter, u16 reg) /*ReadEEprom*/
+{
+	u16 x;
+	u16 data = 0;
+	u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
+
+	tmp8_ori = r8712_read8(padapter, 0x102502f1);
+	tmp8_new = tmp8_ori & 0xf7;
+	if (tmp8_ori != tmp8_new)
+		r8712_write8(padapter, 0x102502f1, tmp8_new);
+	tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
+	tmp8_clk_new = tmp8_clk_ori | 0x20;
+	if (tmp8_clk_new != tmp8_clk_ori)
+		r8712_write8(padapter, 0x10250003, tmp8_clk_new);
+	if (padapter->bSurpriseRemoved == true)
+		goto out;
+	/* select EEPROM, reset bits, set _EECS */
+	x = r8712_read8(padapter, EE_9346CR);
+	if (padapter->bSurpriseRemoved == true)
+		goto out;
+	x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
+	x |= _EEM1 | _EECS;
+	r8712_write8(padapter, EE_9346CR, (unsigned char)x);
+	/* write the read opcode and register number in that order
+	 * The opcode is 3bits in length, reg is 6 bits long
+	 */
+	shift_out_bits(padapter, EEPROM_READ_OPCODE, 3);
+	shift_out_bits(padapter, reg, padapter->EepromAddressSize);
+	/* Now read the data (16 bits) in from the selected EEPROM word */
+	data = shift_in_bits(padapter);
+	eeprom_clean(padapter);
+out:
+	if (tmp8_clk_new != tmp8_clk_ori)
+		r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
+	if (tmp8_new != tmp8_ori)
+		r8712_write8(padapter, 0x102502f1, tmp8_ori);
+	return data;
+}
+