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062589b1 GF |
1 | /* |
2 | * STMicroelectronics Key Scanning driver | |
3 | * | |
4 | * Copyright (c) 2014 STMicroelectonics Ltd. | |
5 | * Author: Stuart Menefy <stuart.menefy@st.com> | |
6 | * | |
7 | * Based on sh_keysc.c, copyright 2008 Magnus Damm | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/input/matrix_keypad.h> | |
20 | ||
21 | #define ST_KEYSCAN_MAXKEYS 16 | |
22 | ||
23 | #define KEYSCAN_CONFIG_OFF 0x0 | |
24 | #define KEYSCAN_CONFIG_ENABLE 0x1 | |
25 | #define KEYSCAN_DEBOUNCE_TIME_OFF 0x4 | |
26 | #define KEYSCAN_MATRIX_STATE_OFF 0x8 | |
27 | #define KEYSCAN_MATRIX_DIM_OFF 0xc | |
28 | #define KEYSCAN_MATRIX_DIM_X_SHIFT 0x0 | |
29 | #define KEYSCAN_MATRIX_DIM_Y_SHIFT 0x2 | |
30 | ||
31 | struct st_keyscan { | |
32 | void __iomem *base; | |
33 | int irq; | |
34 | struct clk *clk; | |
35 | struct input_dev *input_dev; | |
36 | unsigned long last_state; | |
37 | unsigned int n_rows; | |
38 | unsigned int n_cols; | |
39 | unsigned int debounce_us; | |
40 | }; | |
41 | ||
42 | static irqreturn_t keyscan_isr(int irq, void *dev_id) | |
43 | { | |
44 | struct st_keyscan *keypad = dev_id; | |
45 | unsigned short *keycode = keypad->input_dev->keycode; | |
46 | unsigned long state, change; | |
47 | int bit_nr; | |
48 | ||
49 | state = readl(keypad->base + KEYSCAN_MATRIX_STATE_OFF) & 0xffff; | |
50 | change = keypad->last_state ^ state; | |
51 | keypad->last_state = state; | |
52 | ||
53 | for_each_set_bit(bit_nr, &change, BITS_PER_LONG) | |
54 | input_report_key(keypad->input_dev, | |
55 | keycode[bit_nr], state & BIT(bit_nr)); | |
56 | ||
57 | input_sync(keypad->input_dev); | |
58 | ||
59 | return IRQ_HANDLED; | |
60 | } | |
61 | ||
62 | static int keyscan_start(struct st_keyscan *keypad) | |
63 | { | |
64 | int error; | |
65 | ||
66 | error = clk_enable(keypad->clk); | |
67 | if (error) | |
68 | return error; | |
69 | ||
70 | writel(keypad->debounce_us * (clk_get_rate(keypad->clk) / 1000000), | |
71 | keypad->base + KEYSCAN_DEBOUNCE_TIME_OFF); | |
72 | ||
73 | writel(((keypad->n_cols - 1) << KEYSCAN_MATRIX_DIM_X_SHIFT) | | |
74 | ((keypad->n_rows - 1) << KEYSCAN_MATRIX_DIM_Y_SHIFT), | |
75 | keypad->base + KEYSCAN_MATRIX_DIM_OFF); | |
76 | ||
77 | writel(KEYSCAN_CONFIG_ENABLE, keypad->base + KEYSCAN_CONFIG_OFF); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static void keyscan_stop(struct st_keyscan *keypad) | |
83 | { | |
84 | writel(0, keypad->base + KEYSCAN_CONFIG_OFF); | |
85 | ||
86 | clk_disable(keypad->clk); | |
87 | } | |
88 | ||
89 | static int keyscan_open(struct input_dev *dev) | |
90 | { | |
91 | struct st_keyscan *keypad = input_get_drvdata(dev); | |
92 | ||
93 | return keyscan_start(keypad); | |
94 | } | |
95 | ||
96 | static void keyscan_close(struct input_dev *dev) | |
97 | { | |
98 | struct st_keyscan *keypad = input_get_drvdata(dev); | |
99 | ||
100 | keyscan_stop(keypad); | |
101 | } | |
102 | ||
103 | static int keypad_matrix_key_parse_dt(struct st_keyscan *keypad_data) | |
104 | { | |
105 | struct device *dev = keypad_data->input_dev->dev.parent; | |
106 | struct device_node *np = dev->of_node; | |
107 | int error; | |
108 | ||
aef01aad DT |
109 | error = matrix_keypad_parse_properties(dev, &keypad_data->n_rows, |
110 | &keypad_data->n_cols); | |
062589b1 GF |
111 | if (error) { |
112 | dev_err(dev, "failed to parse keypad params\n"); | |
113 | return error; | |
114 | } | |
115 | ||
116 | of_property_read_u32(np, "st,debounce-us", &keypad_data->debounce_us); | |
117 | ||
118 | dev_dbg(dev, "n_rows=%d n_col=%d debounce=%d\n", | |
119 | keypad_data->n_rows, keypad_data->n_cols, | |
120 | keypad_data->debounce_us); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int keyscan_probe(struct platform_device *pdev) | |
126 | { | |
127 | struct st_keyscan *keypad_data; | |
128 | struct input_dev *input_dev; | |
129 | struct resource *res; | |
130 | int error; | |
131 | ||
132 | if (!pdev->dev.of_node) { | |
133 | dev_err(&pdev->dev, "no DT data present\n"); | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | keypad_data = devm_kzalloc(&pdev->dev, sizeof(*keypad_data), | |
138 | GFP_KERNEL); | |
139 | if (!keypad_data) | |
140 | return -ENOMEM; | |
141 | ||
142 | input_dev = devm_input_allocate_device(&pdev->dev); | |
143 | if (!input_dev) { | |
144 | dev_err(&pdev->dev, "failed to allocate the input device\n"); | |
145 | return -ENOMEM; | |
146 | } | |
147 | ||
148 | input_dev->name = pdev->name; | |
149 | input_dev->phys = "keyscan-keys/input0"; | |
150 | input_dev->dev.parent = &pdev->dev; | |
151 | input_dev->open = keyscan_open; | |
152 | input_dev->close = keyscan_close; | |
153 | ||
154 | input_dev->id.bustype = BUS_HOST; | |
155 | ||
156 | error = keypad_matrix_key_parse_dt(keypad_data); | |
157 | if (error) | |
158 | return error; | |
159 | ||
160 | error = matrix_keypad_build_keymap(NULL, NULL, | |
161 | keypad_data->n_rows, | |
162 | keypad_data->n_cols, | |
163 | NULL, input_dev); | |
164 | if (error) { | |
165 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
166 | return error; | |
167 | } | |
168 | ||
169 | input_set_drvdata(input_dev, keypad_data); | |
170 | ||
171 | keypad_data->input_dev = input_dev; | |
172 | ||
173 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
174 | keypad_data->base = devm_ioremap_resource(&pdev->dev, res); | |
175 | if (IS_ERR(keypad_data->base)) | |
176 | return PTR_ERR(keypad_data->base); | |
177 | ||
178 | keypad_data->clk = devm_clk_get(&pdev->dev, NULL); | |
179 | if (IS_ERR(keypad_data->clk)) { | |
180 | dev_err(&pdev->dev, "cannot get clock\n"); | |
181 | return PTR_ERR(keypad_data->clk); | |
182 | } | |
183 | ||
184 | error = clk_enable(keypad_data->clk); | |
185 | if (error) { | |
186 | dev_err(&pdev->dev, "failed to enable clock\n"); | |
187 | return error; | |
188 | } | |
189 | ||
190 | keyscan_stop(keypad_data); | |
191 | ||
192 | keypad_data->irq = platform_get_irq(pdev, 0); | |
193 | if (keypad_data->irq < 0) { | |
194 | dev_err(&pdev->dev, "no IRQ specified\n"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | error = devm_request_irq(&pdev->dev, keypad_data->irq, keyscan_isr, 0, | |
199 | pdev->name, keypad_data); | |
200 | if (error) { | |
201 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
202 | return error; | |
203 | } | |
204 | ||
205 | error = input_register_device(input_dev); | |
206 | if (error) { | |
207 | dev_err(&pdev->dev, "failed to register input device\n"); | |
208 | return error; | |
209 | } | |
210 | ||
211 | platform_set_drvdata(pdev, keypad_data); | |
212 | ||
213 | device_set_wakeup_capable(&pdev->dev, 1); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
2e58cdcc | 218 | #ifdef CONFIG_PM_SLEEP |
062589b1 GF |
219 | static int keyscan_suspend(struct device *dev) |
220 | { | |
221 | struct platform_device *pdev = to_platform_device(dev); | |
222 | struct st_keyscan *keypad = platform_get_drvdata(pdev); | |
223 | struct input_dev *input = keypad->input_dev; | |
224 | ||
225 | mutex_lock(&input->mutex); | |
226 | ||
227 | if (device_may_wakeup(dev)) | |
228 | enable_irq_wake(keypad->irq); | |
229 | else if (input->users) | |
230 | keyscan_stop(keypad); | |
231 | ||
232 | mutex_unlock(&input->mutex); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static int keyscan_resume(struct device *dev) | |
237 | { | |
238 | struct platform_device *pdev = to_platform_device(dev); | |
239 | struct st_keyscan *keypad = platform_get_drvdata(pdev); | |
240 | struct input_dev *input = keypad->input_dev; | |
241 | int retval = 0; | |
242 | ||
243 | mutex_lock(&input->mutex); | |
244 | ||
245 | if (device_may_wakeup(dev)) | |
246 | disable_irq_wake(keypad->irq); | |
247 | else if (input->users) | |
248 | retval = keyscan_start(keypad); | |
249 | ||
250 | mutex_unlock(&input->mutex); | |
251 | return retval; | |
252 | } | |
2e58cdcc | 253 | #endif |
062589b1 GF |
254 | |
255 | static SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops, keyscan_suspend, keyscan_resume); | |
256 | ||
257 | static const struct of_device_id keyscan_of_match[] = { | |
258 | { .compatible = "st,sti-keyscan" }, | |
259 | { }, | |
260 | }; | |
261 | MODULE_DEVICE_TABLE(of, keyscan_of_match); | |
262 | ||
263 | static struct platform_driver keyscan_device_driver = { | |
264 | .probe = keyscan_probe, | |
265 | .driver = { | |
266 | .name = "st-keyscan", | |
267 | .pm = &keyscan_dev_pm_ops, | |
268 | .of_match_table = of_match_ptr(keyscan_of_match), | |
269 | } | |
270 | }; | |
271 | ||
272 | module_platform_driver(keyscan_device_driver); | |
273 | ||
274 | MODULE_AUTHOR("Stuart Menefy <stuart.menefy@st.com>"); | |
275 | MODULE_DESCRIPTION("STMicroelectronics keyscan device driver"); | |
276 | MODULE_LICENSE("GPL"); |