g762.c (594ce0b8a998aa4d05827cd7c0d0dcec9a1e3ae2) g762.c (6ce402327a6fb714a9f40a0bb59bcbfe383839a5)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed
4 * PWM controller chips from G762 family, i.e. G762 and G763
5 *
6 * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org>
7 *
8 * This work is based on a basic version for 2.6.31 kernel developed

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64#define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */
65#define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */
66#define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */
67#define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */
68#define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04
69#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */
70#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */
71
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed
4 * PWM controller chips from G762 family, i.e. G762 and G763
5 *
6 * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org>
7 *
8 * This work is based on a basic version for 2.6.31 kernel developed

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64#define G762_REG_FAN_CMD1_DET_FAN_OOC 0x40 /* enable fan_out_of_control */
65#define G762_REG_FAN_CMD1_OUT_MODE 0x20 /* out mode: PWM or DC */
66#define G762_REG_FAN_CMD1_FAN_MODE 0x10 /* fan mode: closed/open-loop */
67#define G762_REG_FAN_CMD1_CLK_DIV_ID1 0x08 /* clock divisor value */
68#define G762_REG_FAN_CMD1_CLK_DIV_ID0 0x04
69#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */
70#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */
71
72#define G761_REG_FAN_CMD2_FAN_CLOCK 0x20 /* choose internal clock*/
72#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */
73#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04
74#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */
75#define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01
76
77#define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */
78#define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */
79

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110 * FAN_CMD2 register value.
111 */
112#define G762_GEARMULT_FROM_REG(reg) \
113 (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \
114 G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2))
115
116struct g762_data {
117 struct i2c_client *client;
73#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */
74#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04
75#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */
76#define G762_REG_FAN_CMD2_FAN_STARTV_0 0x01
77
78#define G762_REG_FAN_STA_FAIL 0x02 /* fan fail */
79#define G762_REG_FAN_STA_OOC 0x01 /* fan out of control */
80

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111 * FAN_CMD2 register value.
112 */
113#define G762_GEARMULT_FROM_REG(reg) \
114 (1 << (((reg) & (G762_REG_FAN_CMD2_GEAR_MODE_0 | \
115 G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2))
116
117struct g762_data {
118 struct i2c_client *client;
119 bool internal_clock;
118 struct clk *clk;
119
120 /* update mutex */
121 struct mutex update_lock;
122
123 /* board specific parameters. */
124 u32 clk_freq;
125

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561
562/*
563 * Helper to import hardware characteristics from .dts file and push
564 * those to the chip.
565 */
566
567#ifdef CONFIG_OF
568static const struct of_device_id g762_dt_match[] = {
120 struct clk *clk;
121
122 /* update mutex */
123 struct mutex update_lock;
124
125 /* board specific parameters. */
126 u32 clk_freq;
127

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563
564/*
565 * Helper to import hardware characteristics from .dts file and push
566 * those to the chip.
567 */
568
569#ifdef CONFIG_OF
570static const struct of_device_id g762_dt_match[] = {
571 { .compatible = "gmt,g761" },
569 { .compatible = "gmt,g762" },
570 { .compatible = "gmt,g763" },
571 { },
572};
573MODULE_DEVICE_TABLE(of, g762_dt_match);
574
575/*
576 * Grab clock (a required property), enable it, get (fixed) clock frequency

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592 struct g762_data *data;
593 unsigned long clk_freq;
594 struct clk *clk;
595 int ret;
596
597 if (!client->dev.of_node)
598 return 0;
599
572 { .compatible = "gmt,g762" },
573 { .compatible = "gmt,g763" },
574 { },
575};
576MODULE_DEVICE_TABLE(of, g762_dt_match);
577
578/*
579 * Grab clock (a required property), enable it, get (fixed) clock frequency

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595 struct g762_data *data;
596 unsigned long clk_freq;
597 struct clk *clk;
598 int ret;
599
600 if (!client->dev.of_node)
601 return 0;
602
603 data = i2c_get_clientdata(client);
604
605 /*
606 * Skip CLK detection and handling if we use internal clock.
607 * This is only valid for g761.
608 */
609 data->internal_clock = of_device_is_compatible(client->dev.of_node,
610 "gmt,g761") &&
611 !of_property_present(client->dev.of_node,
612 "clocks");
613 if (data->internal_clock) {
614 do_set_clk_freq(&client->dev, 32768);
615 return 0;
616 }
617
600 clk = of_clk_get(client->dev.of_node, 0);
601 if (IS_ERR(clk)) {
602 dev_err(&client->dev, "failed to get clock\n");
603 return PTR_ERR(clk);
604 }
605
606 ret = clk_prepare_enable(clk);
607 if (ret) {
608 dev_err(&client->dev, "failed to enable clock\n");
609 goto clk_put;
610 }
611
612 clk_freq = clk_get_rate(clk);
613 ret = do_set_clk_freq(&client->dev, clk_freq);
614 if (ret) {
615 dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq);
616 goto clk_unprep;
617 }
618
618 clk = of_clk_get(client->dev.of_node, 0);
619 if (IS_ERR(clk)) {
620 dev_err(&client->dev, "failed to get clock\n");
621 return PTR_ERR(clk);
622 }
623
624 ret = clk_prepare_enable(clk);
625 if (ret) {
626 dev_err(&client->dev, "failed to enable clock\n");
627 goto clk_put;
628 }
629
630 clk_freq = clk_get_rate(clk);
631 ret = do_set_clk_freq(&client->dev, clk_freq);
632 if (ret) {
633 dev_err(&client->dev, "invalid clock freq %lu\n", clk_freq);
634 goto clk_unprep;
635 }
636
619 data = i2c_get_clientdata(client);
620 data->clk = clk;
621
622 ret = devm_add_action(&client->dev, g762_of_clock_disable, data);
623 if (ret) {
624 dev_err(&client->dev, "failed to add disable clock action\n");
625 goto clk_unprep;
626 }
627

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1020/*
1021 * Enable both fan failure detection and fan out of control protection. The
1022 * function does not protect change/access to data structure; it must thus
1023 * only be called during initialization.
1024 */
1025static inline int g762_fan_init(struct device *dev)
1026{
1027 struct g762_data *data = g762_update_client(dev);
637 data->clk = clk;
638
639 ret = devm_add_action(&client->dev, g762_of_clock_disable, data);
640 if (ret) {
641 dev_err(&client->dev, "failed to add disable clock action\n");
642 goto clk_unprep;
643 }
644

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1037/*
1038 * Enable both fan failure detection and fan out of control protection. The
1039 * function does not protect change/access to data structure; it must thus
1040 * only be called during initialization.
1041 */
1042static inline int g762_fan_init(struct device *dev)
1043{
1044 struct g762_data *data = g762_update_client(dev);
1045 int ret;
1028
1029 if (IS_ERR(data))
1030 return PTR_ERR(data);
1031
1046
1047 if (IS_ERR(data))
1048 return PTR_ERR(data);
1049
1050 /* internal_clock can only be set with compatible g761 */
1051 if (data->internal_clock)
1052 data->fan_cmd2 |= G761_REG_FAN_CMD2_FAN_CLOCK;
1053
1032 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL;
1033 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC;
1034 data->valid = false;
1035
1054 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL;
1055 data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC;
1056 data->valid = false;
1057
1036 return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
1037 data->fan_cmd1);
1058 ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
1059 data->fan_cmd1);
1060 if (ret)
1061 return ret;
1062
1063 return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD2,
1064 data->fan_cmd2);
1038}
1039
1040static int g762_probe(struct i2c_client *client)
1041{
1042 struct device *dev = &client->dev;
1043 struct device *hwmon_dev;
1044 struct g762_data *data;
1045 int ret;

--- 49 unchanged lines hidden --- 		1065}
1066
1067static int g762_probe(struct i2c_client *client)
1068{
1069 struct device *dev = &client->dev;
1070 struct device *hwmon_dev;
1071 struct g762_data *data;
1072 int ret;

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