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6#include <linux/device.h>
7#include <linux/input.h>
8#include <linux/mod_devicetable.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/property.h>
12#include <linux/regmap.h>
13#include <linux/workqueue.h>
14
15#define CUR_DRV_CAL_SEL GENMASK(13, 12)
16#define SLP_LDOVIBR_PD_EN BIT(9)
17#define LDO_VIBR_PD BIT(8)
18#define SC2730_CUR_DRV_CAL_SEL 0
19#define SC2730_SLP_LDOVIBR_PD_EN BIT(14)
20#define SC2730_LDO_VIBR_PD BIT(13)
21
22struct sc27xx_vibra_data {
23 u32 cur_drv_cal_sel;
24 u32 slp_pd_en;
25 u32 ldo_pd;
26};
27
28struct vibra_info {
29 struct input_dev *input_dev;
30 struct work_struct play_work;
31 struct regmap *regmap;
32 const struct sc27xx_vibra_data *data;
33 u32 base;
34 u32 strength;
35 bool enabled;
36};
37
38static const struct sc27xx_vibra_data sc2731_data = {
39 .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
40 .slp_pd_en = SLP_LDOVIBR_PD_EN,
41 .ldo_pd = LDO_VIBR_PD,
42};
43
44static const struct sc27xx_vibra_data sc2730_data = {
45 .cur_drv_cal_sel = SC2730_CUR_DRV_CAL_SEL,
46 .slp_pd_en = SC2730_SLP_LDOVIBR_PD_EN,
47 .ldo_pd = SC2730_LDO_VIBR_PD,
48};
49
50static const struct sc27xx_vibra_data sc2721_data = {
51 .cur_drv_cal_sel = CUR_DRV_CAL_SEL,
52 .slp_pd_en = SLP_LDOVIBR_PD_EN,
53 .ldo_pd = LDO_VIBR_PD,
54};
55
56static void sc27xx_vibra_set(struct vibra_info *info, bool on)
57{
58 const struct sc27xx_vibra_data *data = info->data;
59 if (on) {
60 regmap_update_bits(info->regmap, info->base, data->ldo_pd, 0);
61 regmap_update_bits(info->regmap, info->base,
62 data->slp_pd_en, 0);
63 info->enabled = true;
64 } else {
65 regmap_update_bits(info->regmap, info->base, data->ldo_pd,
66 data->ldo_pd);
67 regmap_update_bits(info->regmap, info->base,
68 data->slp_pd_en, data->slp_pd_en);
69 info->enabled = false;
70 }
71}
72
73static int sc27xx_vibra_hw_init(struct vibra_info *info)
74{
75 const struct sc27xx_vibra_data *data = info->data;
76
77 if (!data->cur_drv_cal_sel)
78 return 0;
79
80 return regmap_update_bits(info->regmap, info->base,
81 data->cur_drv_cal_sel, 0);
82}
83
84static void sc27xx_vibra_play_work(struct work_struct *work)
85{
86 struct vibra_info *info = container_of(work, struct vibra_info,
87 play_work);
88
89 if (info->strength && !info->enabled)
90 sc27xx_vibra_set(info, true);
91 else if (info->strength == 0 && info->enabled)
92 sc27xx_vibra_set(info, false);
93}
94
95static int sc27xx_vibra_play(struct input_dev *input, void *data,
96 struct ff_effect *effect)
97{
98 struct vibra_info *info = input_get_drvdata(input);
99
100 info->strength = effect->u.rumble.weak_magnitude;
101 schedule_work(&info->play_work);
102
103 return 0;
104}
105
106static void sc27xx_vibra_close(struct input_dev *input)
107{
108 struct vibra_info *info = input_get_drvdata(input);
109
110 cancel_work_sync(&info->play_work);
111 if (info->enabled)
112 sc27xx_vibra_set(info, false);
113}
114
115static int sc27xx_vibra_probe(struct platform_device *pdev)
116{
117 struct vibra_info *info;
118 const struct sc27xx_vibra_data *data;
119 int error;
120
121 data = device_get_match_data(&pdev->dev);
122 if (!data) {
123 dev_err(&pdev->dev, "no matching driver data found\n");
124 return -EINVAL;
125 }
126
127 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
128 if (!info)
129 return -ENOMEM;
130
131 info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
132 if (!info->regmap) {
133 dev_err(&pdev->dev, "failed to get vibrator regmap.\n");
134 return -ENODEV;
135 }
136
137 error = device_property_read_u32(&pdev->dev, "reg", &info->base);
138 if (error) {
139 dev_err(&pdev->dev, "failed to get vibrator base address.\n");
140 return error;
141 }
142
143 info->input_dev = devm_input_allocate_device(&pdev->dev);
144 if (!info->input_dev) {
145 dev_err(&pdev->dev, "failed to allocate input device.\n");
146 return -ENOMEM;
147 }
148
149 info->input_dev->name = "sc27xx:vibrator";
150 info->input_dev->id.version = 0;
151 info->input_dev->close = sc27xx_vibra_close;
152 info->data = data;
153
154 input_set_drvdata(info->input_dev, info);
155 input_set_capability(info->input_dev, EV_FF, FF_RUMBLE);
156 INIT_WORK(&info->play_work, sc27xx_vibra_play_work);
157 info->enabled = false;
158
159 error = sc27xx_vibra_hw_init(info);
160 if (error) {
161 dev_err(&pdev->dev, "failed to initialize the vibrator.\n");
162 return error;
163 }
164
165 error = input_ff_create_memless(info->input_dev, NULL,
166 sc27xx_vibra_play);
167 if (error) {
168 dev_err(&pdev->dev, "failed to register vibrator to FF.\n");
169 return error;
170 }
171
172 error = input_register_device(info->input_dev);
173 if (error) {
174 dev_err(&pdev->dev, "failed to register input device.\n");
175 return error;
176 }
177
178 return 0;
179}
180
181static const struct of_device_id sc27xx_vibra_of_match[] = {
182 { .compatible = "sprd,sc2721-vibrator", .data = &sc2721_data },
183 { .compatible = "sprd,sc2730-vibrator", .data = &sc2730_data },
184 { .compatible = "sprd,sc2731-vibrator", .data = &sc2731_data },
185 {}
186};
187MODULE_DEVICE_TABLE(of, sc27xx_vibra_of_match);
188
189static struct platform_driver sc27xx_vibra_driver = {
190 .driver = {
191 .name = "sc27xx-vibrator",
192 .of_match_table = sc27xx_vibra_of_match,
193 },
194 .probe = sc27xx_vibra_probe,
195};
196
197module_platform_driver(sc27xx_vibra_driver);
198
199MODULE_DESCRIPTION("Spreadtrum SC27xx Vibrator Driver");
200MODULE_LICENSE("GPL v2");
201MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
202
