linux-kernel - [PATCH resend 1/3] hwmon: (lm85) remove freq

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Message-Id: <20190130161447.19946-1-jgebben@sweptlaser.com>
Date:   Wed, 30 Jan 2019 09:14:45 -0700
From:   Jeremy Gebben <jgebben@...ptlaser.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH resend 1/3] hwmon: (lm85) remove freq_map size hardcodes


Allow support for chips that support more than 8 frequencies.
The size still must be a power of two.

Signed-off-by: Jeremy Gebben <jgebben@...ptlaser.com>
---
 drivers/hwmon/lm85.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 0a325878e8f5..48f59667a88c 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -198,13 +198,13 @@ static int RANGE_TO_REG(long range)
 #define RANGE_FROM_REG(val)	lm85_range_map[(val) & 0x0f]
 
 /* These are the PWM frequency encodings */
-static const int lm85_freq_map[8] = { /* 1 Hz */
+static const int lm85_freq_map[] = { /* 1 Hz */
 	10, 15, 23, 30, 38, 47, 61, 94
 };
-static const int adm1027_freq_map[8] = { /* 1 Hz */
+
+static const int adm1027_freq_map[] = { /* 1 Hz */
 	11, 15, 22, 29, 35, 44, 59, 88
 };
-#define FREQ_MAP_LEN	8
 
 static int FREQ_TO_REG(const int *map,
 		       unsigned int map_size, unsigned long freq)
@@ -212,9 +212,9 @@ static int FREQ_TO_REG(const int *map,
 	return find_closest(freq, map, map_size);
 }
 
-static int FREQ_FROM_REG(const int *map, u8 reg)
+static int FREQ_FROM_REG(const int *map, unsigned int map_size, u8 reg)
 {
-	return map[reg & 0x07];
+	return map[reg & (map_size - 1)];
 }
 
 /*
@@ -296,6 +296,8 @@ struct lm85_data {
 	struct i2c_client *client;
 	const struct attribute_group *groups[6];
 	const int *freq_map;
+	unsigned int freq_map_mask;
+
 	enum chips type;
 
 	bool has_vid5;	/* true if VID5 is configured for ADT7463 or ADT7468 */
@@ -514,7 +516,7 @@ static struct lm85_data *lm85_update_device(struct device *dev)
 			data->autofan[i].config =
 			    lm85_read_value(client, LM85_REG_AFAN_CONFIG(i));
 			val = lm85_read_value(client, LM85_REG_AFAN_RANGE(i));
-			data->pwm_freq[i] = val & 0x07;
+			data->pwm_freq[i] = val & data->freq_map_mask;
 			data->zone[i].range = val >> 4;
 			data->autofan[i].min_pwm =
 			    lm85_read_value(client, LM85_REG_AFAN_MINPWM(i));
@@ -791,7 +793,8 @@ static ssize_t show_pwm_freq(struct device *dev,
 	if (IS_ADT7468_HFPWM(data))
 		freq = 22500;
 	else
-		freq = FREQ_FROM_REG(data->freq_map, data->pwm_freq[nr]);
+		freq = FREQ_FROM_REG(data->freq_map, data->freq_map_mask + 1,
+				     data->pwm_freq[nr]);
 
 	return sprintf(buf, "%d\n", freq);
 }
@@ -820,7 +823,7 @@ static ssize_t set_pwm_freq(struct device *dev,
 		lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5);
 	} else {					/* Low freq. mode */
 		data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map,
-						 FREQ_MAP_LEN, val);
+						 data->freq_map_mask + 1, val);
 		lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
 				 (data->zone[nr].range << 4)
 				 | data->pwm_freq[nr]);
@@ -1196,7 +1199,7 @@ static ssize_t set_temp_auto_temp_min(struct device *dev,
 		TEMP_FROM_REG(data->zone[nr].limit));
 	lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
 		((data->zone[nr].range & 0x0f) << 4)
-		| (data->pwm_freq[nr] & 0x07));
+		| data->pwm_freq[nr]);
 
 	mutex_unlock(&data->update_lock);
 	return count;
@@ -1232,7 +1235,7 @@ static ssize_t set_temp_auto_temp_max(struct device *dev,
 		val - min);
 	lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
 		((data->zone[nr].range & 0x0f) << 4)
-		| (data->pwm_freq[nr] & 0x07));
+		| data->pwm_freq[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -1569,9 +1572,11 @@ static int lm85_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	case emc6d103:
 	case emc6d103s:
 		data->freq_map = adm1027_freq_map;
+		data->freq_map_mask = ARRAY_SIZE(adm1027_freq_map) - 1;
 		break;
 	default:
 		data->freq_map = lm85_freq_map;
+		data->freq_map_mask = ARRAY_SIZE(lm85_freq_map) - 1;
 	}
 
 	/* Set the VRM version */
-- 
2.17.1