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From:   marc.ferland@gmail.com
To:     krzysztof.kozlowski@linaro.org
Cc:     gregkh@linuxfoundation.org, marc.ferland@sonatest.com,
        jeff.dagenais@gmail.com, rdunlap@infradead.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 4/7] w1: ds2433: introduce a configuration structure
Date:   Fri, 17 Nov 2023 14:29:06 -0500
Message-Id: <20231117192909.98944-4-marc.ferland@sonatest.com>
In-Reply-To: <20231117192909.98944-1-marc.ferland@sonatest.com>
References: <20231117192909.98944-1-marc.ferland@sonatest.com>
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From: Marc Ferland <marc.ferland@sonatest.com>

Replace defines with a ds2433_config structure for parameters that are
different between the ds2433 and the ds28ec20.

This is ground work for supporting both the ds2433 and the ds28ec20.

Signed-off-by: Marc Ferland <marc.ferland@sonatest.com>
---
 drivers/w1/slaves/w1_ds2433.c | 56 +++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 15 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c
index 6b04fdef2923..75620f67248f 100644
--- a/drivers/w1/slaves/w1_ds2433.c
+++ b/drivers/w1/slaves/w1_ds2433.c
@@ -24,8 +24,6 @@
 
 #define W1_F23_EEPROM_DS2433	0x23
 
-#define W1_EEPROM_SIZE		512
-#define W1_PAGE_COUNT		16
 #define W1_PAGE_SIZE		32
 #define W1_PAGE_BITS		5
 #define W1_PAGE_MASK		0x1F
@@ -35,9 +33,24 @@
 #define W1_F23_READ_SCRATCH	0xAA
 #define W1_F23_COPY_SCRATCH	0x55
 
+struct ds2433_config {
+	size_t eeprom_size;		/* eeprom size in bytes */
+	unsigned int page_count;	/* number of 256 bits pages */
+	unsigned int tprog;		/* time in ms for page programming */
+};
+
+static const struct ds2433_config config_f23 = {
+	.eeprom_size = 512,
+	.page_count = 16,
+	.tprog = 5,
+};
+
 struct w1_f23_data {
-	u8	memory[W1_EEPROM_SIZE];
+#ifdef CONFIG_W1_SLAVE_DS2433_CRC
+	u8	*memory;
 	u32	validcrc;
+#endif
+	const struct ds2433_config *cfg;
 };
 
 /*
@@ -96,7 +109,7 @@ static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
 	u8 wrbuf[3];
 #endif
 
-	count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE);
+	count = w1_f23_fix_count(off, count, bin_attr->size);
 	if (!count)
 		return 0;
 
@@ -151,9 +164,7 @@ static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
  */
 static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data)
 {
-#ifdef CONFIG_W1_SLAVE_DS2433_CRC
 	struct w1_f23_data *f23 = sl->family_data;
-#endif
 	u8 wrbuf[4];
 	u8 rdbuf[W1_PAGE_SIZE + 3];
 	u8 es = (addr + len - 1) & 0x1f;
@@ -189,8 +200,8 @@ static int w1_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data)
 	wrbuf[3] = es;
 	w1_write_block(sl->master, wrbuf, 4);
 
-	/* Sleep for 5 ms to wait for the write to complete */
-	msleep(5);
+	/* Sleep for tprog ms to wait for the write to complete */
+	msleep(f23->cfg->tprog);
 
 	/* Reset the bus to wake up the EEPROM (this may not be needed) */
 	w1_reset_bus(sl->master);
@@ -207,7 +218,7 @@ static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
 	int addr, len, idx;
 
-	count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE);
+	count = w1_f23_fix_count(off, count, bin_attr->size);
 	if (!count)
 		return 0;
 
@@ -251,10 +262,15 @@ static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
 	return count;
 }
 
-static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE);
+static struct bin_attribute bin_attr_f23_eeprom = {
+	.attr = { .name = "eeprom", .mode = 0644 },
+	.read = eeprom_read,
+	.write = eeprom_write,
+	.size = config_f23.eeprom_size,
+};
 
 static struct bin_attribute *w1_f23_bin_attributes[] = {
-	&bin_attr_eeprom,
+	&bin_attr_f23_eeprom,
 	NULL,
 };
 
@@ -269,24 +285,34 @@ static const struct attribute_group *w1_f23_groups[] = {
 
 static int w1_f23_add_slave(struct w1_slave *sl)
 {
-#ifdef CONFIG_W1_SLAVE_DS2433_CRC
 	struct w1_f23_data *data;
 
 	data = kzalloc(sizeof(struct w1_f23_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
+
+	data->cfg = &config_f23;
+
+#ifdef CONFIG_W1_SLAVE_DS2433_CRC
+	data->memory = kzalloc(data->cfg->eeprom_size, GFP_KERNEL);
+	if (!data->memory) {
+		kfree(data);
+		return -ENOMEM;
+	}
+#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
 	sl->family_data = data;
 
-#endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
 	return 0;
 }
 
 static void w1_f23_remove_slave(struct w1_slave *sl)
 {
+	struct w1_f23_data *data = sl->family_data;
 #ifdef CONFIG_W1_SLAVE_DS2433_CRC
-	kfree(sl->family_data);
+	kfree(data->memory);
+#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
+	kfree(data);
 	sl->family_data = NULL;
-#endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
 }
 
 static const struct w1_family_ops w1_f23_fops = {
-- 
2.34.1