pcf50633_mfd.patch

pcf50633 driver rewritten to use the MFD model.

1 files changed, 607 insertions, 0 deletions

diff --git a/drivers/mfd/pcf50633-core.c b/drivers/mfd/pcf50633-core.c
new file mode 100644
index 00000000000..901375b4c20
--- /dev/null
+++ b/drivers/mfd/pcf50633-core.c
@@ -0,0 +1,607 @@
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/mfd/pcf50633/adc.h>
+#include <linux/mfd/pcf50633/rtc.h>
+#include <linux/mfd/pcf50633/mbc.h>
+#include <linux/mfd/pcf50633/input.h>
+#include <linux/mfd/pcf50633/pmic.h>
+
+/* Read a block of upto 32 regs  */
+int pcf50633_read_block(struct pcf50633 *pcf , u8 reg,
+					int nr_regs, u8 *data)
+{
+	int ret;
+
+	mutex_lock(&pcf->lock);
+	ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
+							nr_regs, data);
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_read_block);
+
+/* Write a block of upto 32 regs  */
+int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
+					int nr_regs, u8 *data)
+{
+	int ret;
+
+	mutex_lock(&pcf->lock);
+	ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
+							nr_regs, data);
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_write_block);
+
+u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
+{
+	int ret;
+
+	mutex_lock(&pcf->lock);
+	ret = i2c_smbus_read_byte_data(pcf->i2c_client, reg);
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_reg_read);
+
+int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
+{
+	int ret;
+	mutex_lock(&pcf->lock);
+	ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, val);
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_reg_write);
+
+int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
+{
+	int ret;
+	u8 tmp;
+
+	val &= mask;
+
+	mutex_lock(&pcf->lock);
+
+	tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg);
+	tmp &= ~mask;
+	tmp |= val;
+	ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp);
+
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_reg_set_bit_mask);
+
+int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
+{
+	int ret;
+	u8 tmp;
+
+	mutex_lock(&pcf->lock);
+
+	tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg);
+	tmp &= ~val;
+	ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp);
+
+	mutex_unlock(&pcf->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcf50633_reg_clear_bits);
+
+/* sysfs attributes */
+static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct pcf50633 *pcf = dev_get_drvdata(dev);
+	u8 dump[16];
+	int n, n1, idx = 0;
+	char *buf1 = buf;
+	static u8 address_no_read[] = { /* must be ascending */
+		PCF50633_REG_INT1,
+		PCF50633_REG_INT2,
+		PCF50633_REG_INT3,
+		PCF50633_REG_INT4,
+		PCF50633_REG_INT5,
+		0 /* terminator */
+	};
+
+	for (n = 0; n < 256; n += sizeof(dump)) {
+		for (n1 = 0; n1 < sizeof(dump); n1++)
+			if (n == address_no_read[idx]) {
+				idx++;
+				dump[n1] = 0x00;
+			} else
+				dump[n1] = pcf50633_reg_read(pcf, n + n1);
+
+		hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
+		buf1 += strlen(buf1);
+		*buf1++ = '\n';
+		*buf1 = '\0';
+	}
+
+	return buf1 - buf;
+}
+static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
+
+static ssize_t show_resume_reason(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct pcf50633 *pcf = dev_get_drvdata(dev);
+	int n;
+
+	n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
+				pcf->resume_reason[0],
+				pcf->resume_reason[1],
+				pcf->resume_reason[2],
+				pcf->resume_reason[3],
+				pcf->resume_reason[4]);
+
+	return n;
+}
+static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
+
+static struct attribute *pcf_sysfs_entries[] = {
+	&dev_attr_dump_regs.attr,
+	&dev_attr_resume_reason.attr,
+	NULL,
+};
+
+static struct attribute_group pcf_attr_group = {
+	.name	= NULL,			/* put in device directory */
+	.attrs	= pcf_sysfs_entries,
+};
+
+
+static int pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, int mask)
+{
+	u8 reg, bits, tmp;
+	int ret = 0, idx;
+
+	idx = irq / 8;
+	reg =  PCF50633_REG_INT1M + idx;
+	bits = 1 << (irq % 8);
+
+	mutex_lock(&pcf->lock);
+
+	if (mask) {
+		tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg);
+		tmp |= bits;
+		ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp);
+
+		pcf->mask_regs[idx] &= ~bits;
+		pcf->mask_regs[idx] |= bits;
+	} else {
+		tmp = i2c_smbus_read_byte_data(pcf->i2c_client, reg);
+		tmp &= ~bits;
+		ret = i2c_smbus_write_byte_data(pcf->i2c_client, reg, tmp);
+
+		pcf->mask_regs[idx] &= ~bits;
+	}
+
+	mutex_unlock(&pcf->lock);
+
+	return 0;
+}
+
+int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
+{
+	dev_info(pcf->dev, "Masking IRQ %d\n", irq);
+
+	return pcf50633_irq_mask_set(pcf, irq, 1);
+}
+EXPORT_SYMBOL(pcf50633_irq_mask);
+
+int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
+{
+	dev_info(pcf->dev, "Unmasking IRQ %d\n", irq);
+
+	return pcf50633_irq_mask_set(pcf, irq, 0);
+}
+EXPORT_SYMBOL(pcf50633_irq_unmask);
+
+int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
+{
+	u8 reg, bits;
+
+	reg =  (irq / 8);
+	bits = (1 << (irq % 8));
+
+	return pcf->mask_regs[reg] & bits;
+}
+EXPORT_SYMBOL(pcf50633_irq_mask_get);
+
+static void pcf50633_irq_call_handler(struct pcf50633 *pcf,
+					int irq)
+{
+	if (pcf->irq_handler[irq].handler)
+		pcf->irq_handler[irq].handler(pcf, irq,
+					pcf->irq_handler[irq].data);
+}
+
+#define PCF50633_ONKEY1S_TIMEOUT 8
+
+static void pcf50633_irq_worker(struct work_struct *work)
+{
+	struct pcf50633 *pcf;
+	int ret, i, j;
+	u8 pcf_int[5], chgstat;
+
+	pcf = container_of(work, struct pcf50633, irq_work);
+
+	/* Read the 5 INT regs in one transaction */
+	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
+						sizeof(pcf_int), pcf_int);
+	if (ret != sizeof(pcf_int)) {
+		dev_info(pcf->dev, "Error reading INT registers\n");
+
+		/* We don't have an option but to retry. Because if
+		 * we don't, there won't be another interrupt edge.
+		 */
+		goto reschedule;
+	}
+
+	/* We immediately read the usb and adapter status. We thus make sure
+	 * only of USBINS/USBREM and ADAPINS/ADPREM IRQ handlers are called */
+	if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
+		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
+		if (chgstat & (0x3 << 4))
+			pcf_int[0] &= ~(1 << PCF50633_INT1_USBREM);
+		else
+			pcf_int[0] &= ~(1 << PCF50633_INT1_USBINS);
+	}
+
+	if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
+		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
+		if (chgstat & (0x3 << 4))
+			pcf_int[0] &= ~(1 << PCF50633_INT1_ADPREM);
+		else
+			pcf_int[0] &= ~(1 << PCF50633_INT1_ADPINS);
+	}
+
+	dev_info(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
+			"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
+			pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
+
+	/* Some revisions of the chip don't have a 8s standby mode on
+	 * ONKEY1S press. We try to manually do it in such cases. */
+
+	if (pcf_int[0] & PCF50633_INT1_SECOND && pcf->onkey1s_held) {
+		dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
+							pcf->onkey1s_held);
+		if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
+			if (pcf->pdata->force_shutdown)
+				pcf->pdata->force_shutdown(pcf);
+	}
+
+	if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
+		dev_info(pcf->dev, "ONKEY1S held\n");
+		pcf->onkey1s_held = 1 ;
+
+		/* Unmask IRQ_SECOND */
+		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
+						PCF50633_INT1_SECOND);
+
+		/* Unmask IRQ_ONKEYR */
+		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
+						PCF50633_INT1_SECOND);
+	}
+
+	if (pcf_int[1] & PCF50633_INT2_ONKEYR & pcf->onkey1s_held) {
+		pcf->onkey1s_held = 0;
+
+		/* Mask SECOND and ONKEYR interrupts */
+		if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
+			pcf50633_reg_set_bit_mask(pcf,
+					PCF50633_REG_INT1M,
+					PCF50633_INT1_SECOND,
+					PCF50633_INT1_SECOND);
+
+		if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
+			pcf50633_reg_set_bit_mask(pcf,
+					PCF50633_REG_INT2M,
+					PCF50633_INT2_ONKEYR,
+					PCF50633_INT2_ONKEYR);
+	}
+
+	/* Have we just resumed ? */
+	if (pcf->is_suspended) {
+
+		pcf->is_suspended = 0;
+
+		/* Set the resume reason filtering out non resumers */
+		for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
+			pcf->resume_reason[i] = pcf_int[i] &
+						pcf->pdata->resumers[i];
+
+		/* Make sure we don't pass on any input events to
+		 * userspace now */
+		pcf_int[1] = 0;
+	}
+
+	/* Unset masked interrupts */
+	for (i = 0; i < 5; i++)
+		pcf_int[i] &= ~pcf->mask_regs[i];
+
+	for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
+		for (j = 0; j < 8 ; j++)
+			if (pcf_int[i] & (1 << j))
+				pcf50633_irq_call_handler(pcf, (i * 8) + j);
+
+	put_device(pcf->dev);
+
+	return;
+reschedule:
+	schedule_work(&pcf->irq_work);
+
+	/* Don't put_device here. Will be used when we are rescheduled */
+
+	return;
+}
+
+static irqreturn_t pcf50633_irq(int irq, void *data)
+{
+	struct pcf50633 *pcf = data;
+
+	get_device(pcf->dev);
+	schedule_work(&pcf->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void
+pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
+						struct platform_device **pdev)
+{
+	int ret;
+
+	*pdev = platform_device_alloc(name, -1);
+
+	if (!pdev) {
+		dev_err(pcf->dev, "Falied to allocate %s\n", name);
+		return;
+	}
+
+	(*pdev)->dev.parent = pcf->dev;
+	platform_set_drvdata(*pdev, pcf);
+
+	ret = platform_device_add(*pdev);
+	if (ret != 0) {
+		dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
+		platform_device_put(*pdev);
+		*pdev = NULL;
+	}
+}
+
+#ifdef CONFIG_PM
+static int pcf50633_suspend(struct device *dev, pm_message_t state)
+{
+	struct pcf50633 *pcf;
+	int ret, i;
+	u8 res[5];
+
+	pcf = dev_get_drvdata(dev);
+
+	/* Make sure our interrupt handlers are not called
+	 * henceforth */
+	disable_irq(pcf->irq);
+
+	/* Make sure that an IRQ worker has quit */
+	cancel_work_sync(&pcf->irq_work);
+
+	/* Save the masks */
+	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M, 5,
+					pcf->suspend_irq_masks);
+	if (ret < 0)
+		dev_err(pcf->dev, "error saving irq masks\n");
+
+	/* Set interrupt masks. So that only those sources we want to wake
+	 * us up can
+	 */
+	for (i = 0; i < 5; i++)
+		res[i] = ~pcf->pdata->resumers[i];
+
+	pcf50633_write_block(pcf, PCF50633_REG_INT1M, 5, &res[0]);
+
+	pcf->is_suspended = 1;
+
+	return 0;
+}
+
+static int pcf50633_resume(struct device *dev)
+{
+	struct pcf50633 *pcf;
+
+	pcf = dev_get_drvdata(dev);
+
+	/* Write the saved mask registers */
+	pcf50633_write_block(pcf, PCF50633_REG_INT1M, 5,
+					pcf->suspend_irq_masks);
+
+	/* Clear any pending interrupts and set resume reason if any */
+	pcf50633_irq_worker(&pcf->irq_work);
+
+	enable_irq(pcf->irq);
+
+	return 0;
+}
+#else
+#define pcf50633_suspend NULL
+#define pcf50633_resume NULL
+#endif
+
+static int pcf50633_probe(struct i2c_client *client,
+				const struct i2c_device_id *ids)
+{
+	struct pcf50633 *pcf;
+	struct pcf50633_platform_data *pdata;
+	int i, ret = 0;
+	int version, variant;
+	u8 mbcs1;
+
+	pdata = client->dev.platform_data;
+
+	pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
+	if (!pcf)
+		return -ENOMEM;
+
+	pcf->pdata = pdata;
+	pdata->pcf = pcf;
+	
+	mutex_init(&pcf->lock);
+
+	i2c_set_clientdata(client, pcf);
+	pcf->dev = &client->dev;
+	pcf->i2c_client = client;
+
+	INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);
+
+	version = pcf50633_reg_read(pcf, 0);
+	if (version < 0) {
+		dev_err(pcf->dev, "Unable to probe pcf50633\n");
+		kfree(pcf);
+		return -ENODEV;
+	}
+
+	variant = pcf50633_reg_read(pcf, 1);
+	if (version < 0) {
+		dev_err(pcf->dev, "Unable to probe pcf50633\n");
+		kfree(pcf);
+		return -ENODEV;
+	}
+
+	dev_info(pcf->dev, "Probed device version %d variant %d\n",
+							version, variant);
+
+	/* Enable all inteerupts except RTC SECOND */
+	pcf->mask_regs[0] = 0x80;
+	pcf50633_reg_write(pcf, PCF50633_REG_INT1M, 0x80);
+
+	pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
+	pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
+	pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
+	pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
+
+	pcf50633_client_dev_register(pcf, "pcf50633-input",
+						&pcf->input.pdev);
+	pcf50633_client_dev_register(pcf, "pcf50633-rtc",
+						&pcf->rtc.pdev);
+	pcf50633_client_dev_register(pcf, "pcf50633-mbc",
+						&pcf->mbc.pdev);
+	pcf50633_client_dev_register(pcf, "pcf50633-adc",
+						&pcf->adc.pdev);
+	pcf50633_client_dev_register(pcf, "pcf50633-gpio",
+						&pcf->gpio.pdev);
+	for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
+		struct platform_device *pdev;
+
+		pdev = platform_device_alloc("pcf50633-regltr", i);
+		if (!pdev) {
+			dev_err(pcf->dev, "Cannot create regulator\n");
+			continue;
+		}
+
+		pdev->dev.parent = pcf->dev;
+		pdev->dev.platform_data = &pdata->reg_init_data[i];
+		pdev->dev.driver_data = pcf;
+		pcf->pmic.pdev[i] = pdev;
+
+		platform_device_add(pdev);
+	}
+
+	pcf->irq = client->irq;
+
+	if (client->irq) {
+		ret = request_irq(client->irq, pcf50633_irq,
+				IRQF_TRIGGER_FALLING, "pcf50633", pcf);
+
+		if (ret) {
+			dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
+			goto err;
+		}
+	} else {
+		dev_err(pcf->dev, "No IRQ configured\n");
+		goto err;
+	}
+
+	if (enable_irq_wake(client->irq) < 0)
+		dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
+			"in this hardware revision", client->irq);
+
+	/* Cold Intialization */
+	mbcs1 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS1);
+
+	if (mbcs1 & 0x01)
+		pcf50633_irq_call_handler(pcf, PCF50633_IRQ_USBINS);
+	if (mbcs1 & 0x04)
+		pcf50633_irq_call_handler(pcf, PCF50633_IRQ_ADPINS);
+
+	ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
+	if (ret)
+		dev_err(pcf->dev, "error creating sysfs entries\n");
+
+	if (pdata->probe_done)
+		pdata->probe_done(pcf);
+
+	return 0;
+
+err:
+	kfree(pcf);
+	return ret;
+}
+
+static int pcf50633_remove(struct i2c_client *client)
+{
+	struct pcf50633 *pcf = i2c_get_clientdata(client);
+
+	free_irq(pcf->irq, pcf);
+	kfree(pcf);
+
+	return 0;
+}
+
+static struct i2c_device_id pcf50633_id_table[] = {
+	{"pcf50633", 0x73},
+};
+
+static struct i2c_driver pcf50633_driver = {
+	.driver = {
+		.name	= "pcf50633",
+		.suspend = pcf50633_suspend,
+		.resume	= pcf50633_resume,
+	},
+	.id_table = pcf50633_id_table,
+	.probe = pcf50633_probe,
+	.remove = pcf50633_remove,
+};
+
+static int __init pcf50633_init(void)
+{
+	return i2c_add_driver(&pcf50633_driver);
+}
+
+static void pcf50633_exit(void)
+{
+	i2c_del_driver(&pcf50633_driver);
+}
+
+MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_LICENSE("GPL");
+
+module_init(pcf50633_init);
+module_exit(pcf50633_exit);