linux-kernel - [PATCH v4 3/5] w1: ds2433: introduce a configuration structure

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Date: Mon, 18 Dec 2023 10:02:28 -0500
From: marc.ferland@...il.com
To: krzysztof.kozlowski@...aro.org
Cc: gregkh@...uxfoundation.org,
	marc.ferland@...atest.com,
	jeff.dagenais@...il.com,
	rdunlap@...radead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/5] w1: ds2433: introduce a configuration structure

From: Marc Ferland <marc.ferland@...atest.com>

Add a ds2433_config structure for parameters that are different
between the ds2433 and the ds28ec20. The goal is to reuse the same
code for both chips.

A pointer to this config structure is added to w1_f23_data and the
CONFIG_W1_SLAVE_DS2433_CRC ifdefs are adjusted since now both driver
configurations (with or without crc support) will make use of
w1_f23_data.

Also, the 'memory' buffer is now dynamically allocated based on the
size specififed in the config structure to help support memories of
different sizes.

Signed-off-by: Marc Ferland <marc.ferland@...atest.com>
---
 drivers/w1/slaves/w1_ds2433.c | 47 ++++++++++++++++++++++++++---------
 1 file changed, 35 insertions(+), 12 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c
index cd99eceac1ae..0c67082c8bb7 100644
--- a/drivers/w1/slaves/w1_ds2433.c
+++ b/drivers/w1/slaves/w1_ds2433.c
@@ -34,9 +34,24 @@
 #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 = W1_EEPROM_SIZE,
+	.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;
 };
 
 /*
@@ -95,7 +110,7 @@ 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;
 
@@ -150,9 +165,7 @@ 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;
@@ -188,8 +201,8 @@ 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);
@@ -206,7 +219,7 @@ 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;
 
@@ -268,24 +281,34 @@ 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)
 {
-#ifdef CONFIG_W1_SLAVE_DS2433_CRC
-	kfree(sl->family_data);
+	struct w1_f23_data *data = sl->family_data;
 	sl->family_data = NULL;
-#endif	/* CONFIG_W1_SLAVE_DS2433_CRC */
+#ifdef CONFIG_W1_SLAVE_DS2433_CRC
+	kfree(data->memory);
+#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
+	kfree(data);
 }
 
 static const struct w1_family_ops w1_f23_fops = {
-- 
2.34.1