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1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Arun R Murthy <arun.murthy@stericsson.com>
5 * License terms: GNU General Public License (GPL) version 2
6 */
7#include <linux/err.h>
8#include <linux/platform_device.h>
9#include <linux/slab.h>
10#include <linux/pwm.h>
11#include <linux/mfd/abx500.h>
12#include <linux/mfd/abx500/ab8500.h>
13#include <linux/module.h>
14
15/*
16 * PWM Out generators
17 * Bank: 0x10
18 */
19#define AB8500_PWM_OUT_CTRL1_REG 0x60
20#define AB8500_PWM_OUT_CTRL2_REG 0x61
21#define AB8500_PWM_OUT_CTRL7_REG 0x66
22
23struct ab8500_pwm_chip {
24 struct pwm_chip chip;
25};
26
27static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
28 int duty_ns, int period_ns)
29{
30 int ret = 0;
31 unsigned int higher_val, lower_val;
32 u8 reg;
33
34 /*
35 * get the first 8 bits that are be written to
36 * AB8500_PWM_OUT_CTRL1_REG[0:7]
37 */
38 lower_val = duty_ns & 0x00FF;
39 /*
40 * get bits [9:10] that are to be written to
41 * AB8500_PWM_OUT_CTRL2_REG[0:1]
42 */
43 higher_val = ((duty_ns & 0x0300) >> 8);
44
45 reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
46
47 ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
48 reg, (u8)lower_val);
49 if (ret < 0)
50 return ret;
51 ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
52 (reg + 1), (u8)higher_val);
53
54 return ret;
55}
56
57static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
58{
59 int ret;
60
61 ret = abx500_mask_and_set_register_interruptible(chip->dev,
62 AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
63 1 << (chip->base - 1), 1 << (chip->base - 1));
64 if (ret < 0)
65 dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
66 pwm->label, ret);
67 return ret;
68}
69
70static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
71{
72 int ret;
73
74 ret = abx500_mask_and_set_register_interruptible(chip->dev,
75 AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
76 1 << (chip->base - 1), 0);
77 if (ret < 0)
78 dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
79 pwm->label, ret);
80}
81
82static const struct pwm_ops ab8500_pwm_ops = {
83 .config = ab8500_pwm_config,
84 .enable = ab8500_pwm_enable,
85 .disable = ab8500_pwm_disable,
86 .owner = THIS_MODULE,
87};
88
89static int ab8500_pwm_probe(struct platform_device *pdev)
90{
91 struct ab8500_pwm_chip *ab8500;
92 int err;
93
94 /*
95 * Nothing to be done in probe, this is required to get the
96 * device which is required for ab8500 read and write
97 */
98 ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
99 if (ab8500 == NULL)
100 return -ENOMEM;
101
102 ab8500->chip.dev = &pdev->dev;
103 ab8500->chip.ops = &ab8500_pwm_ops;
104 ab8500->chip.base = pdev->id;
105 ab8500->chip.npwm = 1;
106
107 err = pwmchip_add(&ab8500->chip);
108 if (err < 0)
109 return err;
110
111 dev_dbg(&pdev->dev, "pwm probe successful\n");
112 platform_set_drvdata(pdev, ab8500);
113
114 return 0;
115}
116
117static int ab8500_pwm_remove(struct platform_device *pdev)
118{
119 struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
120 int err;
121
122 err = pwmchip_remove(&ab8500->chip);
123 if (err < 0)
124 return err;
125
126 dev_dbg(&pdev->dev, "pwm driver removed\n");
127
128 return 0;
129}
130
131static struct platform_driver ab8500_pwm_driver = {
132 .driver = {
133 .name = "ab8500-pwm",
134 },
135 .probe = ab8500_pwm_probe,
136 .remove = ab8500_pwm_remove,
137};
138module_platform_driver(ab8500_pwm_driver);
139
140MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
141MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
142MODULE_ALIAS("platform:ab8500-pwm");
143MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Arun R Murthy <arun.murthy@stericsson.com>
5 * License terms: GNU General Public License (GPL) version 2
6 */
7#include <linux/err.h>
8#include <linux/platform_device.h>
9#include <linux/slab.h>
10#include <linux/pwm.h>
11#include <linux/mfd/abx500.h>
12#include <linux/mfd/abx500/ab8500.h>
13#include <linux/module.h>
14
15/*
16 * PWM Out generators
17 * Bank: 0x10
18 */
19#define AB8500_PWM_OUT_CTRL1_REG 0x60
20#define AB8500_PWM_OUT_CTRL2_REG 0x61
21#define AB8500_PWM_OUT_CTRL7_REG 0x66
22
23/* backlight driver constants */
24#define ENABLE_PWM 1
25#define DISABLE_PWM 0
26
27struct ab8500_pwm_chip {
28 struct pwm_chip chip;
29};
30
31static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
32 int duty_ns, int period_ns)
33{
34 int ret = 0;
35 unsigned int higher_val, lower_val;
36 u8 reg;
37
38 /*
39 * get the first 8 bits that are be written to
40 * AB8500_PWM_OUT_CTRL1_REG[0:7]
41 */
42 lower_val = duty_ns & 0x00FF;
43 /*
44 * get bits [9:10] that are to be written to
45 * AB8500_PWM_OUT_CTRL2_REG[0:1]
46 */
47 higher_val = ((duty_ns & 0x0300) >> 8);
48
49 reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
50
51 ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
52 reg, (u8)lower_val);
53 if (ret < 0)
54 return ret;
55 ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
56 (reg + 1), (u8)higher_val);
57
58 return ret;
59}
60
61static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
62{
63 int ret;
64
65 ret = abx500_mask_and_set_register_interruptible(chip->dev,
66 AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
67 1 << (chip->base - 1), ENABLE_PWM);
68 if (ret < 0)
69 dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
70 pwm->label, ret);
71 return ret;
72}
73
74static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
75{
76 int ret;
77
78 ret = abx500_mask_and_set_register_interruptible(chip->dev,
79 AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
80 1 << (chip->base - 1), DISABLE_PWM);
81 if (ret < 0)
82 dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
83 pwm->label, ret);
84 return;
85}
86
87static const struct pwm_ops ab8500_pwm_ops = {
88 .config = ab8500_pwm_config,
89 .enable = ab8500_pwm_enable,
90 .disable = ab8500_pwm_disable,
91 .owner = THIS_MODULE,
92};
93
94static int ab8500_pwm_probe(struct platform_device *pdev)
95{
96 struct ab8500_pwm_chip *ab8500;
97 int err;
98
99 /*
100 * Nothing to be done in probe, this is required to get the
101 * device which is required for ab8500 read and write
102 */
103 ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
104 if (ab8500 == NULL) {
105 dev_err(&pdev->dev, "failed to allocate memory\n");
106 return -ENOMEM;
107 }
108
109 ab8500->chip.dev = &pdev->dev;
110 ab8500->chip.ops = &ab8500_pwm_ops;
111 ab8500->chip.base = pdev->id;
112 ab8500->chip.npwm = 1;
113
114 err = pwmchip_add(&ab8500->chip);
115 if (err < 0)
116 return err;
117
118 dev_dbg(&pdev->dev, "pwm probe successful\n");
119 platform_set_drvdata(pdev, ab8500);
120
121 return 0;
122}
123
124static int ab8500_pwm_remove(struct platform_device *pdev)
125{
126 struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
127 int err;
128
129 err = pwmchip_remove(&ab8500->chip);
130 if (err < 0)
131 return err;
132
133 dev_dbg(&pdev->dev, "pwm driver removed\n");
134
135 return 0;
136}
137
138static struct platform_driver ab8500_pwm_driver = {
139 .driver = {
140 .name = "ab8500-pwm",
141 .owner = THIS_MODULE,
142 },
143 .probe = ab8500_pwm_probe,
144 .remove = ab8500_pwm_remove,
145};
146module_platform_driver(ab8500_pwm_driver);
147
148MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
149MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
150MODULE_ALIAS("platform:ab8500-pwm");
151MODULE_LICENSE("GPL v2");