Openwrt/target/linux/s3c24xx/patches-2.6.24/1187-fix-pcf50633-use-i2c-bulk-autoincrement.patch.patch

From 8a2d04c222684e3278dd28d11f57a05fe0865183 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@openmoko.com>
Date: Wed, 2 Jul 2008 22:40:12 +0100
Subject: [PATCH] fix-pcf50633-use-i2c-bulk-autoincrement.patch

Simplify and speed up bulk sequential I2C actions in pcf50633
the time savings are pretty considerable and so is the simplification

Signed-off-by: Andy Green <andy@openmoko.com>
---
 drivers/i2c/chips/pcf50633.c |  117 +++++++++++++++++++++++++-----------------
 1 files changed, 70 insertions(+), 47 deletions(-)

diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
index 1f88c32..96857a3 100644
--- a/drivers/i2c/chips/pcf50633.c
+++ b/drivers/i2c/chips/pcf50633.c
@@ -156,14 +156,14 @@ struct pcf50633_data {
 
 #ifdef CONFIG_PM
 	struct {
-		u_int8_t int1m, int2m, int3m, int4m, int5m;
 		u_int8_t ooctim2;
-		u_int8_t autoout, autoena, automxc;
-		u_int8_t down1out, down1mxc;
-		u_int8_t down2out, down2ena;
-		u_int8_t memldoout, memldoena;
-		u_int8_t ledout, ledena, leddim;
-		u_int8_t ldo[__NUM_PCF50633_REGS][2];
+		/* enables are always [1] below
+		 * I2C has limit of 32 sequential regs, so done in two lumps
+		 * because it covers 33 register extent otherwise
+		 */
+		u_int8_t misc[PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT + 1];
+		/*  skip 1 reserved reg here */
+		u_int8_t ldo[PCF50633_REG_HCLDOENA - PCF50633_REG_LDO1OUT + 1];
 	} standby_regs;
 
 	struct resume_dependency resume_dependency;
@@ -1737,6 +1737,8 @@ static int pcf50633bl_set_intensity(struct backlight_device *bd)
 	int old_intensity = reg_read(pcf, PCF50633_REG_LEDOUT);
 	int ret;
 
+	dev_info(&pcf->client.dev, "pcf50633bl_set_intensity\n");
+
 	if (!(reg_read(pcf, PCF50633_REG_LEDENA) & 1))
 		old_intensity = 0;
 
@@ -2221,6 +2223,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 	int i;
 	int ret;
 	u_int8_t tmp;
+	u_int8_t res[5];
+
+	dev_err(dev, "pcf50633_suspend\n");
 
 	/* we suspend once (!) as late as possible in the suspend sequencing */
 
@@ -2228,30 +2233,26 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 		return 0;
 
 	/* The general idea is to power down all unused power supplies,
-	 * and then mask all PCF50606 interrup sources but EXTONR, ONKEYF
+	 * and then mask all PCF50633 interrupt sources but EXTONR, ONKEYF
 	 * and ALARM */
 
 	mutex_lock(&pcf->lock);
 
 	/* Save all registers that don't "survive" standby state */
 	pcf->standby_regs.ooctim2 = __reg_read(pcf, PCF50633_REG_OOCTIM2);
-	pcf->standby_regs.autoout = __reg_read(pcf, PCF50633_REG_AUTOOUT);
-	pcf->standby_regs.autoena = __reg_read(pcf, PCF50633_REG_AUTOENA);
-	pcf->standby_regs.automxc = __reg_read(pcf, PCF50633_REG_AUTOMXC);
-	pcf->standby_regs.down1out = __reg_read(pcf, PCF50633_REG_DOWN1OUT);
-	pcf->standby_regs.down1mxc = __reg_read(pcf, PCF50633_REG_DOWN1MXC);
-	pcf->standby_regs.down2out = __reg_read(pcf, PCF50633_REG_DOWN2OUT);
-	pcf->standby_regs.down2ena = __reg_read(pcf, PCF50633_REG_DOWN2ENA);
-	pcf->standby_regs.memldoout = __reg_read(pcf, PCF50633_REG_MEMLDOOUT);
-	pcf->standby_regs.memldoena = __reg_read(pcf, PCF50633_REG_MEMLDOENA);
-	pcf->standby_regs.ledout = __reg_read(pcf, PCF50633_REG_LEDOUT);
-	pcf->standby_regs.ledena = __reg_read(pcf, PCF50633_REG_LEDENA);
-	pcf->standby_regs.leddim = __reg_read(pcf, PCF50633_REG_LEDDIM);
+
+	ret = i2c_smbus_read_i2c_block_data(&pcf->client,
+					    PCF50633_REG_AUTOOUT,
+					    sizeof(pcf->standby_regs.misc),
+					    &pcf->standby_regs.misc[0]);
+	if (ret != 18)
+		dev_err(dev, "Failed to save misc levels and enables :-(\n");
 
 	/* regulator voltages and enable states */
 	ret = i2c_smbus_read_i2c_block_data(&pcf->client,
-					    PCF50633_REG_LDO1OUT, 14,
-					    &pcf->standby_regs.ldo[0][0]);
+					    PCF50633_REG_LDO1OUT,
+					    sizeof(pcf->standby_regs.ldo),
+					    &pcf->standby_regs.ldo[0]);
 	if (ret != 14)
 		dev_err(dev, "Failed to save LDO levels and enables :-(\n");
 
@@ -2261,11 +2262,16 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 			continue;
 
 		dev_dbg(dev, "disabling regulator %u\n", i);
-		/* we cannot use pcf50633_onoff_set() because we're
-		 * already under the mutex */
-		tmp = __reg_read(pcf, regulator_registers[i]+1);
-		tmp &= 0xfe;
-		__reg_write(pcf, regulator_registers[i]+1, tmp);
+
+		/* we can save ourselves the read part of a read-modify-write
+		 * here because we captured all these already
+		 */
+		if (i < 4)
+			tmp = pcf->standby_regs.misc[i * 4 + 1];
+		else
+			tmp = pcf->standby_regs.ldo[(i - 4) * 2 + 1];
+
+		__reg_write(pcf, regulator_registers[i] + 1, tmp & 0xfe);
 	}
 
 	/* turn off the backlight */
@@ -2276,11 +2282,14 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 	/* set interrupt masks so only those sources we want to wake
 	 * us are able to
 	 */
-	__reg_write(pcf, PCF50633_REG_INT1M, ~pcf->pdata->resumers[0]);
-	__reg_write(pcf, PCF50633_REG_INT2M, ~pcf->pdata->resumers[1]);
-	__reg_write(pcf, PCF50633_REG_INT3M, ~pcf->pdata->resumers[2]);
-	__reg_write(pcf, PCF50633_REG_INT4M, ~pcf->pdata->resumers[3]);
-	__reg_write(pcf, PCF50633_REG_INT5M, ~pcf->pdata->resumers[4]);
+	for (i = 0; i < 5; i++)
+		res[i] = ~pcf->pdata->resumers[i];
+
+	ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+					     PCF50633_REG_INT1M,
+					     5, &res[0]);
+	if (ret)
+		dev_err(dev, "Failed to set wake masks :-( %d\n", ret);
 
 	pcf->have_been_suspended = 1;
 
@@ -2312,9 +2321,12 @@ EXPORT_SYMBOL_GPL(pcf50633_ready);
 void pcf50633_backlight_resume(struct pcf50633_data *pcf)
 {
 	/* we force the backlight on in fact */
-	__reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.ledout);
-	__reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.ledena | 0x01);
-	__reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.leddim);
+	__reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.misc[
+				   PCF50633_REG_LEDOUT - PCF50633_REG_AUTOOUT]);
+	__reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.misc[
+			       PCF50633_REG_LEDENA - PCF50633_REG_AUTOOUT] | 1);
+	__reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.misc[
+				   PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT]);
 }
 EXPORT_SYMBOL_GPL(pcf50633_backlight_resume);
 
@@ -2324,7 +2336,10 @@ static int pcf50633_resume(struct device *dev)
 	struct i2c_client *client = to_i2c_client(dev);
 	struct pcf50633_data *pcf = i2c_get_clientdata(client);
 	int ret;
+	u8 res[5];
 
+	dev_info(dev, "pcf50633_resume suspended on entry = %d\n",
+						      pcf->have_been_suspended);
 	mutex_lock(&pcf->lock);
 
 	pcf->have_been_suspended = 2; /* resuming */
@@ -2332,14 +2347,14 @@ static int pcf50633_resume(struct device *dev)
 	/* these guys get reset while pcf50633 is suspend state, refresh */
 
 	__reg_write(pcf, PCF50633_REG_OOCTIM2, pcf->standby_regs.ooctim2);
-	__reg_write(pcf, PCF50633_REG_AUTOOUT, pcf->standby_regs.autoout);
-	__reg_write(pcf, PCF50633_REG_AUTOMXC, pcf->standby_regs.automxc);
-	__reg_write(pcf, PCF50633_REG_DOWN1OUT, pcf->standby_regs.down1out);
-	__reg_write(pcf, PCF50633_REG_DOWN1MXC, pcf->standby_regs.down1mxc);
-	__reg_write(pcf, PCF50633_REG_DOWN2OUT, pcf->standby_regs.down2out);
-	__reg_write(pcf, PCF50633_REG_DOWN2ENA, pcf->standby_regs.down2ena);
-	__reg_write(pcf, PCF50633_REG_MEMLDOOUT, pcf->standby_regs.memldoout);
-	__reg_write(pcf, PCF50633_REG_MEMLDOENA, pcf->standby_regs.memldoena);
+
+	/* regulator voltages and enable states */
+	ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+					     PCF50633_REG_AUTOOUT,
+					     sizeof(pcf->standby_regs.misc) - 4,
+					     &pcf->standby_regs.misc[0]);
+	if (ret)
+		dev_err(dev, "Failed to restore misc :-( %d\n", ret);
 
 	/* platform can choose to defer backlight bringup */
 	if (!pcf->pdata->defer_resume_backlight)
@@ -2347,14 +2362,22 @@ static int pcf50633_resume(struct device *dev)
 
 	/* regulator voltages and enable states */
 	ret = i2c_smbus_write_i2c_block_data(&pcf->client,
-					    PCF50633_REG_LDO1OUT, 14,
-					    &pcf->standby_regs.ldo[0][0]);
+					     PCF50633_REG_LDO1OUT,
+					     sizeof(pcf->standby_regs.ldo),
+					     &pcf->standby_regs.ldo[0]);
 	if (ret)
 		dev_err(dev, "Failed to restore LDOs :-( %d\n", ret);
 
-	mutex_unlock(&pcf->lock);
+	memset(res, 0, sizeof(res));
+	ret = i2c_smbus_write_i2c_block_data(&pcf->client,
+					     PCF50633_REG_INT1M,
+					     5, &res[0]);
+	if (ret)
+		dev_err(dev, "Failed to set int masks :-( %d\n", ret);
 
-	pcf50633_irq(pcf->irq, pcf);
+	pcf->have_been_suspended = 3; /* resume completed */
+
+	mutex_unlock(&pcf->lock);
 
 	callback_all_resume_dependencies(&pcf->resume_dependency);
 
-- 
1.5.6.5