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1/*
2 * SPEAr Keyboard Driver
3 * Based on omap-keypad driver
4 *
5 * Copyright (C) 2010 ST Microelectronics
6 * Rajeev Kumar <rajeevkumar.linux@gmail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
13#include <linux/clk.h>
14#include <linux/errno.h>
15#include <linux/interrupt.h>
16#include <linux/input.h>
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/platform_device.h>
23#include <linux/pm_wakeup.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26#include <linux/platform_data/keyboard-spear.h>
27
28/* Keyboard Registers */
29#define MODE_CTL_REG 0x00
30#define STATUS_REG 0x0C
31#define DATA_REG 0x10
32#define INTR_MASK 0x54
33
34/* Register Values */
35#define NUM_ROWS 16
36#define NUM_COLS 16
37#define MODE_CTL_PCLK_FREQ_SHIFT 9
38#define MODE_CTL_PCLK_FREQ_MSK 0x7F
39
40#define MODE_CTL_KEYBOARD (0x2 << 0)
41#define MODE_CTL_SCAN_RATE_10 (0x0 << 2)
42#define MODE_CTL_SCAN_RATE_20 (0x1 << 2)
43#define MODE_CTL_SCAN_RATE_40 (0x2 << 2)
44#define MODE_CTL_SCAN_RATE_80 (0x3 << 2)
45#define MODE_CTL_KEYNUM_SHIFT 6
46#define MODE_CTL_START_SCAN (0x1 << 8)
47
48#define STATUS_DATA_AVAIL (0x1 << 1)
49
50#define DATA_ROW_MASK 0xF0
51#define DATA_COLUMN_MASK 0x0F
52
53#define ROW_SHIFT 4
54
55struct spear_kbd {
56 struct input_dev *input;
57 void __iomem *io_base;
58 struct clk *clk;
59 unsigned int irq;
60 unsigned int mode;
61 unsigned int suspended_rate;
62 unsigned short last_key;
63 unsigned short keycodes[NUM_ROWS * NUM_COLS];
64 bool rep;
65 bool irq_wake_enabled;
66 u32 mode_ctl_reg;
67};
68
69static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
70{
71 struct spear_kbd *kbd = dev_id;
72 struct input_dev *input = kbd->input;
73 unsigned int key;
74 u32 sts, val;
75
76 sts = readl_relaxed(kbd->io_base + STATUS_REG);
77 if (!(sts & STATUS_DATA_AVAIL))
78 return IRQ_NONE;
79
80 if (kbd->last_key != KEY_RESERVED) {
81 input_report_key(input, kbd->last_key, 0);
82 kbd->last_key = KEY_RESERVED;
83 }
84
85 /* following reads active (row, col) pair */
86 val = readl_relaxed(kbd->io_base + DATA_REG) &
87 (DATA_ROW_MASK | DATA_COLUMN_MASK);
88 key = kbd->keycodes[val];
89
90 input_event(input, EV_MSC, MSC_SCAN, val);
91 input_report_key(input, key, 1);
92 input_sync(input);
93
94 kbd->last_key = key;
95
96 /* clear interrupt */
97 writel_relaxed(0, kbd->io_base + STATUS_REG);
98
99 return IRQ_HANDLED;
100}
101
102static int spear_kbd_open(struct input_dev *dev)
103{
104 struct spear_kbd *kbd = input_get_drvdata(dev);
105 int error;
106 u32 val;
107
108 kbd->last_key = KEY_RESERVED;
109
110 error = clk_enable(kbd->clk);
111 if (error)
112 return error;
113
114 /* keyboard rate to be programmed is input clock (in MHz) - 1 */
115 val = clk_get_rate(kbd->clk) / 1000000 - 1;
116 val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT;
117
118 /* program keyboard */
119 val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val |
120 (kbd->mode << MODE_CTL_KEYNUM_SHIFT);
121 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
122 writel_relaxed(1, kbd->io_base + STATUS_REG);
123
124 /* start key scan */
125 val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
126 val |= MODE_CTL_START_SCAN;
127 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
128
129 return 0;
130}
131
132static void spear_kbd_close(struct input_dev *dev)
133{
134 struct spear_kbd *kbd = input_get_drvdata(dev);
135 u32 val;
136
137 /* stop key scan */
138 val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
139 val &= ~MODE_CTL_START_SCAN;
140 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
141
142 clk_disable(kbd->clk);
143
144 kbd->last_key = KEY_RESERVED;
145}
146
147#ifdef CONFIG_OF
148static int spear_kbd_parse_dt(struct platform_device *pdev,
149 struct spear_kbd *kbd)
150{
151 struct device_node *np = pdev->dev.of_node;
152 int error;
153 u32 val, suspended_rate;
154
155 if (!np) {
156 dev_err(&pdev->dev, "Missing DT data\n");
157 return -EINVAL;
158 }
159
160 if (of_property_read_bool(np, "autorepeat"))
161 kbd->rep = true;
162
163 if (of_property_read_u32(np, "suspended_rate", &suspended_rate))
164 kbd->suspended_rate = suspended_rate;
165
166 error = of_property_read_u32(np, "st,mode", &val);
167 if (error) {
168 dev_err(&pdev->dev, "DT: Invalid or missing mode\n");
169 return error;
170 }
171
172 kbd->mode = val;
173 return 0;
174}
175#else
176static inline int spear_kbd_parse_dt(struct platform_device *pdev,
177 struct spear_kbd *kbd)
178{
179 return -ENOSYS;
180}
181#endif
182
183static int spear_kbd_probe(struct platform_device *pdev)
184{
185 struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev);
186 const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL;
187 struct spear_kbd *kbd;
188 struct input_dev *input_dev;
189 struct resource *res;
190 int irq;
191 int error;
192
193 irq = platform_get_irq(pdev, 0);
194 if (irq < 0)
195 return irq;
196
197 kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL);
198 if (!kbd) {
199 dev_err(&pdev->dev, "not enough memory for driver data\n");
200 return -ENOMEM;
201 }
202
203 input_dev = devm_input_allocate_device(&pdev->dev);
204 if (!input_dev) {
205 dev_err(&pdev->dev, "unable to allocate input device\n");
206 return -ENOMEM;
207 }
208
209 kbd->input = input_dev;
210 kbd->irq = irq;
211
212 if (!pdata) {
213 error = spear_kbd_parse_dt(pdev, kbd);
214 if (error)
215 return error;
216 } else {
217 kbd->mode = pdata->mode;
218 kbd->rep = pdata->rep;
219 kbd->suspended_rate = pdata->suspended_rate;
220 }
221
222 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
223 kbd->io_base = devm_ioremap_resource(&pdev->dev, res);
224 if (IS_ERR(kbd->io_base))
225 return PTR_ERR(kbd->io_base);
226
227 kbd->clk = devm_clk_get(&pdev->dev, NULL);
228 if (IS_ERR(kbd->clk))
229 return PTR_ERR(kbd->clk);
230
231 input_dev->name = "Spear Keyboard";
232 input_dev->phys = "keyboard/input0";
233 input_dev->id.bustype = BUS_HOST;
234 input_dev->id.vendor = 0x0001;
235 input_dev->id.product = 0x0001;
236 input_dev->id.version = 0x0100;
237 input_dev->open = spear_kbd_open;
238 input_dev->close = spear_kbd_close;
239
240 error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS,
241 kbd->keycodes, input_dev);
242 if (error) {
243 dev_err(&pdev->dev, "Failed to build keymap\n");
244 return error;
245 }
246
247 if (kbd->rep)
248 __set_bit(EV_REP, input_dev->evbit);
249 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
250
251 input_set_drvdata(input_dev, kbd);
252
253 error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0,
254 "keyboard", kbd);
255 if (error) {
256 dev_err(&pdev->dev, "request_irq failed\n");
257 return error;
258 }
259
260 error = clk_prepare(kbd->clk);
261 if (error)
262 return error;
263
264 error = input_register_device(input_dev);
265 if (error) {
266 dev_err(&pdev->dev, "Unable to register keyboard device\n");
267 clk_unprepare(kbd->clk);
268 return error;
269 }
270
271 device_init_wakeup(&pdev->dev, 1);
272 platform_set_drvdata(pdev, kbd);
273
274 return 0;
275}
276
277static int spear_kbd_remove(struct platform_device *pdev)
278{
279 struct spear_kbd *kbd = platform_get_drvdata(pdev);
280
281 input_unregister_device(kbd->input);
282 clk_unprepare(kbd->clk);
283
284 return 0;
285}
286
287static int spear_kbd_suspend(struct device *dev)
288{
289 struct platform_device *pdev = to_platform_device(dev);
290 struct spear_kbd *kbd = platform_get_drvdata(pdev);
291 struct input_dev *input_dev = kbd->input;
292 unsigned int rate = 0, mode_ctl_reg, val;
293
294 mutex_lock(&input_dev->mutex);
295
296 /* explicitly enable clock as we may program device */
297 clk_enable(kbd->clk);
298
299 mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG);
300
301 if (device_may_wakeup(&pdev->dev)) {
302 if (!enable_irq_wake(kbd->irq))
303 kbd->irq_wake_enabled = true;
304
305 /*
306 * reprogram the keyboard operating frequency as on some
307 * platform it may change during system suspended
308 */
309 if (kbd->suspended_rate)
310 rate = kbd->suspended_rate / 1000000 - 1;
311 else
312 rate = clk_get_rate(kbd->clk) / 1000000 - 1;
313
314 val = mode_ctl_reg &
315 ~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT);
316 val |= (rate & MODE_CTL_PCLK_FREQ_MSK)
317 << MODE_CTL_PCLK_FREQ_SHIFT;
318 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
319
320 } else {
321 if (input_device_enabled(input_dev)) {
322 writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN,
323 kbd->io_base + MODE_CTL_REG);
324 clk_disable(kbd->clk);
325 }
326 }
327
328 /* store current configuration */
329 if (input_device_enabled(input_dev))
330 kbd->mode_ctl_reg = mode_ctl_reg;
331
332 /* restore previous clk state */
333 clk_disable(kbd->clk);
334
335 mutex_unlock(&input_dev->mutex);
336
337 return 0;
338}
339
340static int spear_kbd_resume(struct device *dev)
341{
342 struct platform_device *pdev = to_platform_device(dev);
343 struct spear_kbd *kbd = platform_get_drvdata(pdev);
344 struct input_dev *input_dev = kbd->input;
345
346 mutex_lock(&input_dev->mutex);
347
348 if (device_may_wakeup(&pdev->dev)) {
349 if (kbd->irq_wake_enabled) {
350 kbd->irq_wake_enabled = false;
351 disable_irq_wake(kbd->irq);
352 }
353 } else {
354 if (input_device_enabled(input_dev))
355 clk_enable(kbd->clk);
356 }
357
358 /* restore current configuration */
359 if (input_device_enabled(input_dev))
360 writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG);
361
362 mutex_unlock(&input_dev->mutex);
363
364 return 0;
365}
366
367static DEFINE_SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops,
368 spear_kbd_suspend, spear_kbd_resume);
369
370#ifdef CONFIG_OF
371static const struct of_device_id spear_kbd_id_table[] = {
372 { .compatible = "st,spear300-kbd" },
373 {}
374};
375MODULE_DEVICE_TABLE(of, spear_kbd_id_table);
376#endif
377
378static struct platform_driver spear_kbd_driver = {
379 .probe = spear_kbd_probe,
380 .remove = spear_kbd_remove,
381 .driver = {
382 .name = "keyboard",
383 .pm = pm_sleep_ptr(&spear_kbd_pm_ops),
384 .of_match_table = of_match_ptr(spear_kbd_id_table),
385 },
386};
387module_platform_driver(spear_kbd_driver);
388
389MODULE_AUTHOR("Rajeev Kumar");
390MODULE_DESCRIPTION("SPEAr Keyboard Driver");
391MODULE_LICENSE("GPL");
1/*
2 * SPEAr Keyboard Driver
3 * Based on omap-keypad driver
4 *
5 * Copyright (C) 2010 ST Microelectronics
6 * Rajeev Kumar <rajeevkumar.linux@gmail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
13#include <linux/clk.h>
14#include <linux/errno.h>
15#include <linux/interrupt.h>
16#include <linux/input.h>
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/platform_device.h>
23#include <linux/pm_wakeup.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26#include <linux/platform_data/keyboard-spear.h>
27
28/* Keyboard Registers */
29#define MODE_CTL_REG 0x00
30#define STATUS_REG 0x0C
31#define DATA_REG 0x10
32#define INTR_MASK 0x54
33
34/* Register Values */
35#define NUM_ROWS 16
36#define NUM_COLS 16
37#define MODE_CTL_PCLK_FREQ_SHIFT 9
38#define MODE_CTL_PCLK_FREQ_MSK 0x7F
39
40#define MODE_CTL_KEYBOARD (0x2 << 0)
41#define MODE_CTL_SCAN_RATE_10 (0x0 << 2)
42#define MODE_CTL_SCAN_RATE_20 (0x1 << 2)
43#define MODE_CTL_SCAN_RATE_40 (0x2 << 2)
44#define MODE_CTL_SCAN_RATE_80 (0x3 << 2)
45#define MODE_CTL_KEYNUM_SHIFT 6
46#define MODE_CTL_START_SCAN (0x1 << 8)
47
48#define STATUS_DATA_AVAIL (0x1 << 1)
49
50#define DATA_ROW_MASK 0xF0
51#define DATA_COLUMN_MASK 0x0F
52
53#define ROW_SHIFT 4
54
55struct spear_kbd {
56 struct input_dev *input;
57 void __iomem *io_base;
58 struct clk *clk;
59 unsigned int irq;
60 unsigned int mode;
61 unsigned int suspended_rate;
62 unsigned short last_key;
63 unsigned short keycodes[NUM_ROWS * NUM_COLS];
64 bool rep;
65 bool irq_wake_enabled;
66 u32 mode_ctl_reg;
67};
68
69static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
70{
71 struct spear_kbd *kbd = dev_id;
72 struct input_dev *input = kbd->input;
73 unsigned int key;
74 u32 sts, val;
75
76 sts = readl_relaxed(kbd->io_base + STATUS_REG);
77 if (!(sts & STATUS_DATA_AVAIL))
78 return IRQ_NONE;
79
80 if (kbd->last_key != KEY_RESERVED) {
81 input_report_key(input, kbd->last_key, 0);
82 kbd->last_key = KEY_RESERVED;
83 }
84
85 /* following reads active (row, col) pair */
86 val = readl_relaxed(kbd->io_base + DATA_REG) &
87 (DATA_ROW_MASK | DATA_COLUMN_MASK);
88 key = kbd->keycodes[val];
89
90 input_event(input, EV_MSC, MSC_SCAN, val);
91 input_report_key(input, key, 1);
92 input_sync(input);
93
94 kbd->last_key = key;
95
96 /* clear interrupt */
97 writel_relaxed(0, kbd->io_base + STATUS_REG);
98
99 return IRQ_HANDLED;
100}
101
102static int spear_kbd_open(struct input_dev *dev)
103{
104 struct spear_kbd *kbd = input_get_drvdata(dev);
105 int error;
106 u32 val;
107
108 kbd->last_key = KEY_RESERVED;
109
110 error = clk_enable(kbd->clk);
111 if (error)
112 return error;
113
114 /* keyboard rate to be programmed is input clock (in MHz) - 1 */
115 val = clk_get_rate(kbd->clk) / 1000000 - 1;
116 val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT;
117
118 /* program keyboard */
119 val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val |
120 (kbd->mode << MODE_CTL_KEYNUM_SHIFT);
121 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
122 writel_relaxed(1, kbd->io_base + STATUS_REG);
123
124 /* start key scan */
125 val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
126 val |= MODE_CTL_START_SCAN;
127 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
128
129 return 0;
130}
131
132static void spear_kbd_close(struct input_dev *dev)
133{
134 struct spear_kbd *kbd = input_get_drvdata(dev);
135 u32 val;
136
137 /* stop key scan */
138 val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
139 val &= ~MODE_CTL_START_SCAN;
140 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
141
142 clk_disable(kbd->clk);
143
144 kbd->last_key = KEY_RESERVED;
145}
146
147#ifdef CONFIG_OF
148static int spear_kbd_parse_dt(struct platform_device *pdev,
149 struct spear_kbd *kbd)
150{
151 struct device_node *np = pdev->dev.of_node;
152 int error;
153 u32 val, suspended_rate;
154
155 if (!np) {
156 dev_err(&pdev->dev, "Missing DT data\n");
157 return -EINVAL;
158 }
159
160 if (of_property_read_bool(np, "autorepeat"))
161 kbd->rep = true;
162
163 if (of_property_read_u32(np, "suspended_rate", &suspended_rate))
164 kbd->suspended_rate = suspended_rate;
165
166 error = of_property_read_u32(np, "st,mode", &val);
167 if (error) {
168 dev_err(&pdev->dev, "DT: Invalid or missing mode\n");
169 return error;
170 }
171
172 kbd->mode = val;
173 return 0;
174}
175#else
176static inline int spear_kbd_parse_dt(struct platform_device *pdev,
177 struct spear_kbd *kbd)
178{
179 return -ENOSYS;
180}
181#endif
182
183static int spear_kbd_probe(struct platform_device *pdev)
184{
185 struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev);
186 const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL;
187 struct spear_kbd *kbd;
188 struct input_dev *input_dev;
189 int irq;
190 int error;
191
192 irq = platform_get_irq(pdev, 0);
193 if (irq < 0)
194 return irq;
195
196 kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL);
197 if (!kbd) {
198 dev_err(&pdev->dev, "not enough memory for driver data\n");
199 return -ENOMEM;
200 }
201
202 input_dev = devm_input_allocate_device(&pdev->dev);
203 if (!input_dev) {
204 dev_err(&pdev->dev, "unable to allocate input device\n");
205 return -ENOMEM;
206 }
207
208 kbd->input = input_dev;
209 kbd->irq = irq;
210
211 if (!pdata) {
212 error = spear_kbd_parse_dt(pdev, kbd);
213 if (error)
214 return error;
215 } else {
216 kbd->mode = pdata->mode;
217 kbd->rep = pdata->rep;
218 kbd->suspended_rate = pdata->suspended_rate;
219 }
220
221 kbd->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
222 if (IS_ERR(kbd->io_base))
223 return PTR_ERR(kbd->io_base);
224
225 kbd->clk = devm_clk_get(&pdev->dev, NULL);
226 if (IS_ERR(kbd->clk))
227 return PTR_ERR(kbd->clk);
228
229 input_dev->name = "Spear Keyboard";
230 input_dev->phys = "keyboard/input0";
231 input_dev->id.bustype = BUS_HOST;
232 input_dev->id.vendor = 0x0001;
233 input_dev->id.product = 0x0001;
234 input_dev->id.version = 0x0100;
235 input_dev->open = spear_kbd_open;
236 input_dev->close = spear_kbd_close;
237
238 error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS,
239 kbd->keycodes, input_dev);
240 if (error) {
241 dev_err(&pdev->dev, "Failed to build keymap\n");
242 return error;
243 }
244
245 if (kbd->rep)
246 __set_bit(EV_REP, input_dev->evbit);
247 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
248
249 input_set_drvdata(input_dev, kbd);
250
251 error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0,
252 "keyboard", kbd);
253 if (error) {
254 dev_err(&pdev->dev, "request_irq failed\n");
255 return error;
256 }
257
258 error = clk_prepare(kbd->clk);
259 if (error)
260 return error;
261
262 error = input_register_device(input_dev);
263 if (error) {
264 dev_err(&pdev->dev, "Unable to register keyboard device\n");
265 clk_unprepare(kbd->clk);
266 return error;
267 }
268
269 device_init_wakeup(&pdev->dev, 1);
270 platform_set_drvdata(pdev, kbd);
271
272 return 0;
273}
274
275static void spear_kbd_remove(struct platform_device *pdev)
276{
277 struct spear_kbd *kbd = platform_get_drvdata(pdev);
278
279 input_unregister_device(kbd->input);
280 clk_unprepare(kbd->clk);
281}
282
283static int spear_kbd_suspend(struct device *dev)
284{
285 struct platform_device *pdev = to_platform_device(dev);
286 struct spear_kbd *kbd = platform_get_drvdata(pdev);
287 struct input_dev *input_dev = kbd->input;
288 unsigned int rate = 0, mode_ctl_reg, val;
289
290 mutex_lock(&input_dev->mutex);
291
292 /* explicitly enable clock as we may program device */
293 clk_enable(kbd->clk);
294
295 mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG);
296
297 if (device_may_wakeup(&pdev->dev)) {
298 if (!enable_irq_wake(kbd->irq))
299 kbd->irq_wake_enabled = true;
300
301 /*
302 * reprogram the keyboard operating frequency as on some
303 * platform it may change during system suspended
304 */
305 if (kbd->suspended_rate)
306 rate = kbd->suspended_rate / 1000000 - 1;
307 else
308 rate = clk_get_rate(kbd->clk) / 1000000 - 1;
309
310 val = mode_ctl_reg &
311 ~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT);
312 val |= (rate & MODE_CTL_PCLK_FREQ_MSK)
313 << MODE_CTL_PCLK_FREQ_SHIFT;
314 writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
315
316 } else {
317 if (input_device_enabled(input_dev)) {
318 writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN,
319 kbd->io_base + MODE_CTL_REG);
320 clk_disable(kbd->clk);
321 }
322 }
323
324 /* store current configuration */
325 if (input_device_enabled(input_dev))
326 kbd->mode_ctl_reg = mode_ctl_reg;
327
328 /* restore previous clk state */
329 clk_disable(kbd->clk);
330
331 mutex_unlock(&input_dev->mutex);
332
333 return 0;
334}
335
336static int spear_kbd_resume(struct device *dev)
337{
338 struct platform_device *pdev = to_platform_device(dev);
339 struct spear_kbd *kbd = platform_get_drvdata(pdev);
340 struct input_dev *input_dev = kbd->input;
341
342 mutex_lock(&input_dev->mutex);
343
344 if (device_may_wakeup(&pdev->dev)) {
345 if (kbd->irq_wake_enabled) {
346 kbd->irq_wake_enabled = false;
347 disable_irq_wake(kbd->irq);
348 }
349 } else {
350 if (input_device_enabled(input_dev))
351 clk_enable(kbd->clk);
352 }
353
354 /* restore current configuration */
355 if (input_device_enabled(input_dev))
356 writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG);
357
358 mutex_unlock(&input_dev->mutex);
359
360 return 0;
361}
362
363static DEFINE_SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops,
364 spear_kbd_suspend, spear_kbd_resume);
365
366#ifdef CONFIG_OF
367static const struct of_device_id spear_kbd_id_table[] = {
368 { .compatible = "st,spear300-kbd" },
369 {}
370};
371MODULE_DEVICE_TABLE(of, spear_kbd_id_table);
372#endif
373
374static struct platform_driver spear_kbd_driver = {
375 .probe = spear_kbd_probe,
376 .remove_new = spear_kbd_remove,
377 .driver = {
378 .name = "keyboard",
379 .pm = pm_sleep_ptr(&spear_kbd_pm_ops),
380 .of_match_table = of_match_ptr(spear_kbd_id_table),
381 },
382};
383module_platform_driver(spear_kbd_driver);
384
385MODULE_AUTHOR("Rajeev Kumar");
386MODULE_DESCRIPTION("SPEAr Keyboard Driver");
387MODULE_LICENSE("GPL");