drivers/fmc: hide fmc operations behind helpers

This gave us more freedom to change/add/remove operations without
recompiling all device driver.

Typically, Carrier board implement the fmc operations, so they will not
use these helpers.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Tested-by: Pat Riehecky <riehecky@fnal.gov>
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/fmc/fmc-chardev.c

@@ -129,8 +129,7 @@ static int fc_probe(struct fmc_device *fmc)
 
 	struct fc_instance *fc;
 
-	if (fmc->op->validate)
-		index = fmc->op->validate(fmc, &fc_drv);
+	index = fmc_validate(fmc, &fc_drv);
 	if (index < 0)
 		return -EINVAL; /* not our device: invalid */
 

drivers/fmc/fmc-core.c

@@ -118,6 +118,61 @@ static struct bin_attribute fmc_eeprom_attr = {
 	.write = fmc_write_eeprom,
 };
 
+int fmc_irq_request(struct fmc_device *fmc, irq_handler_t h,
+		    char *name, int flags)
+{
+	if (fmc->op->irq_request)
+		return fmc->op->irq_request(fmc, h, name, flags);
+	return -EPERM;
+}
+EXPORT_SYMBOL(fmc_irq_request);
+
+void fmc_irq_free(struct fmc_device *fmc)
+{
+	if (fmc->op->irq_free)
+		fmc->op->irq_free(fmc);
+}
+EXPORT_SYMBOL(fmc_irq_free);
+
+void fmc_irq_ack(struct fmc_device *fmc)
+{
+	if (likely(fmc->op->irq_ack))
+		fmc->op->irq_ack(fmc);
+}
+EXPORT_SYMBOL(fmc_irq_ack);
+
+int fmc_validate(struct fmc_device *fmc, struct fmc_driver *drv)
+{
+	if (fmc->op->validate)
+		return fmc->op->validate(fmc, drv);
+	return -EPERM;
+}
+EXPORT_SYMBOL(fmc_validate);
+
+int fmc_gpio_config(struct fmc_device *fmc, struct fmc_gpio *gpio, int ngpio)
+{
+	if (fmc->op->gpio_config)
+		return fmc->op->gpio_config(fmc, gpio, ngpio);
+	return -EPERM;
+}
+EXPORT_SYMBOL(fmc_gpio_config);
+
+int fmc_read_ee(struct fmc_device *fmc, int pos, void *d, int l)
+{
+	if (fmc->op->read_ee)
+		return fmc->op->read_ee(fmc, pos, d, l);
+	return -EPERM;
+}
+EXPORT_SYMBOL(fmc_read_ee);
+
+int fmc_write_ee(struct fmc_device *fmc, int pos, const void *d, int l)
+{
+	if (fmc->op->write_ee)
+		return fmc->op->write_ee(fmc, pos, d, l);
+	return -EPERM;
+}
+EXPORT_SYMBOL(fmc_write_ee);
+
 /*
  * Functions for client modules follow
  */

drivers/fmc/fmc-match.c

@@ -63,7 +63,7 @@ int fmc_fill_id_info(struct fmc_device *fmc)
 		if (!fmc->eeprom)
 			return -ENOMEM;
 		allocated = 1;
-		ret = fmc->op->read_ee(fmc, 0, fmc->eeprom, fmc->eeprom_len);
+		ret = fmc_read_ee(fmc, 0, fmc->eeprom, fmc->eeprom_len);
 		if (ret < 0)
 			goto out;
 	}

drivers/fmc/fmc-trivial.c

@@ -24,7 +24,7 @@ static irqreturn_t t_handler(int irq, void *dev_id)
 {
 	struct fmc_device *fmc = dev_id;
 
-	fmc->op->irq_ack(fmc);
+	fmc_irq_ack(fmc);
 	dev_info(&fmc->dev, "received irq %i\n", irq);
 	return IRQ_HANDLED;
 }
@@ -46,33 +46,29 @@ static int t_probe(struct fmc_device *fmc)
 	int ret;
 	int index = 0;
 
-	if (fmc->op->validate)
-		index = fmc->op->validate(fmc, &t_drv);
+	index = fmc_validate(fmc, &t_drv);
 	if (index < 0)
 		return -EINVAL; /* not our device: invalid */
 
-	ret = fmc->op->irq_request(fmc, t_handler, "fmc-trivial", IRQF_SHARED);
+	ret = fmc_irq_request(fmc, t_handler, "fmc-trivial", IRQF_SHARED);
 	if (ret < 0)
 		return ret;
 	/* ignore error code of call below, we really don't care */
-	fmc->op->gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio));
+	fmc_gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio));
 
-	/* Reprogram, if asked to. ESRCH == no filename specified */
-	ret = -ESRCH;
-	if (fmc->op->reprogram)
-		ret = fmc->op->reprogram(fmc, &t_drv, "");
-	if (ret == -ESRCH)
+	ret = fmc_reprogram(fmc, &t_drv, "", 0);
+	if (ret == -EPERM) /* programming not supported */
 		ret = 0;
 	if (ret < 0)
-		fmc->op->irq_free(fmc);
+		fmc_irq_free(fmc);
 
 	/* FIXME: reprogram LM32 too */
 	return ret;
 }
 
 static int t_remove(struct fmc_device *fmc)
 {
-	fmc->op->irq_free(fmc);
+	fmc_irq_free(fmc);
 	return 0;
 }
 

drivers/fmc/fmc-write-eeprom.c

@@ -50,7 +50,7 @@ static int fwe_run_tlv(struct fmc_device *fmc, const struct firmware *fw,
 		if (write) {
 			dev_info(&fmc->dev, "write %i bytes at 0x%04x\n",
 				 thislen, thisaddr);
-			err = fmc->op->write_ee(fmc, thisaddr, p + 5, thislen);
+			err = fmc_write_ee(fmc, thisaddr, p + 5, thislen);
 		}
 		if (err < 0) {
 			dev_err(&fmc->dev, "write failure @0x%04x\n",
@@ -70,7 +70,7 @@ static int fwe_run_bin(struct fmc_device *fmc, const struct firmware *fw)
 	int ret;
 
 	dev_info(&fmc->dev, "programming %zi bytes\n", fw->size);
-	ret = fmc->op->write_ee(fmc, 0, (void *)fw->data, fw->size);
+	ret = fmc_write_ee(fmc, 0, (void *)fw->data, fw->size);
 	if (ret < 0) {
 		dev_info(&fmc->dev, "write_eeprom: error %i\n", ret);
 		return ret;
@@ -115,8 +115,8 @@ static int fwe_probe(struct fmc_device *fmc)
 			KBUILD_MODNAME);
 		return -ENODEV;
 	}
-	if (fmc->op->validate)
-		index = fmc->op->validate(fmc, &fwe_drv);
+
+	index = fmc_validate(fmc, &fwe_drv);
 	if (index < 0) {
 		pr_err("%s: refusing device \"%s\"\n", KBUILD_MODNAME,
 		       dev_name(dev));

include/linux/fmc.h

@@ -234,4 +234,22 @@ extern void fmc_free_id_info(struct fmc_device *fmc);
 extern void fmc_dump_eeprom(const struct fmc_device *fmc);
 extern void fmc_dump_sdb(const struct fmc_device *fmc);
 
+/* helpers for FMC operations */
+extern int fmc_irq_request(struct fmc_device *fmc, irq_handler_t h,
+			   char *name, int flags);
+extern void fmc_irq_free(struct fmc_device *fmc);
+extern void fmc_irq_ack(struct fmc_device *fmc);
+extern int fmc_validate(struct fmc_device *fmc, struct fmc_driver *drv);
+extern int fmc_gpio_config(struct fmc_device *fmc, struct fmc_gpio *gpio,
+			   int ngpio);
+extern int fmc_read_ee(struct fmc_device *fmc, int pos, void *d, int l);
+extern int fmc_write_ee(struct fmc_device *fmc, int pos, const void *d, int l);
+
+/* helpers for FMC operations */
+extern int fmc_irq_request(struct fmc_device *fmc, irq_handler_t h,
+			   char *name, int flags);
+extern void fmc_irq_free(struct fmc_device *fmc);
+extern void fmc_irq_ack(struct fmc_device *fmc);
+extern int fmc_validate(struct fmc_device *fmc, struct fmc_driver *drv);
+
 #endif /* __LINUX_FMC_H__ */