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fbd1b17b DB |
1 | /* |
2 | * LCD / Backlight control code for Sharp SL-6000x (tosa) | |
3 | * | |
4 | * Copyright (c) 2005 Dirk Opfer | |
5 | * Copyright (c) 2007,2008 Dmitry Baryshkov | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/spi/spi.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/gpio.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/lcd.h> | |
21 | #include <linux/fb.h> | |
22 | ||
23 | #include <asm/mach/sharpsl_param.h> | |
24 | ||
25 | #include <mach/tosa.h> | |
26 | ||
27 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) | |
28 | ||
29 | #define TG_REG0_VQV 0x0001 | |
30 | #define TG_REG0_COLOR 0x0002 | |
31 | #define TG_REG0_UD 0x0004 | |
32 | #define TG_REG0_LR 0x0008 | |
33 | ||
34 | #define DAC_BASE 0x4e | |
35 | ||
36 | struct tosa_lcd_data { | |
37 | struct spi_device *spi; | |
38 | struct lcd_device *lcd; | |
39 | struct i2c_client *i2c; | |
40 | ||
41 | int lcd_power; | |
0ec561f4 | 42 | bool is_vga; |
fbd1b17b DB |
43 | }; |
44 | ||
45 | static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data) | |
46 | { | |
47 | u8 buf[1]; | |
48 | struct spi_message msg; | |
49 | struct spi_transfer xfer = { | |
50 | .len = 1, | |
51 | .cs_change = 1, | |
52 | .tx_buf = buf, | |
53 | }; | |
54 | ||
55 | buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); | |
56 | spi_message_init(&msg); | |
57 | spi_message_add_tail(&xfer, &msg); | |
58 | ||
59 | return spi_sync(spi, &msg); | |
60 | } | |
61 | ||
62 | int tosa_bl_enable(struct spi_device *spi, int enable) | |
63 | { | |
64 | /* bl_enable GP04=1 otherwise GP04=0*/ | |
65 | return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00); | |
66 | } | |
67 | EXPORT_SYMBOL(tosa_bl_enable); | |
68 | ||
69 | static void tosa_lcd_tg_init(struct tosa_lcd_data *data) | |
70 | { | |
71 | /* TG on */ | |
72 | gpio_set_value(TOSA_GPIO_TG_ON, 0); | |
73 | ||
74 | mdelay(60); | |
75 | ||
76 | /* delayed 0clk TCTL signal for VGA */ | |
77 | tosa_tg_send(data->spi, TG_TPOSCTL, 0x00); | |
78 | /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */ | |
79 | tosa_tg_send(data->spi, TG_GPOSR, 0x02); | |
80 | } | |
81 | ||
82 | static void tosa_lcd_tg_on(struct tosa_lcd_data *data) | |
83 | { | |
84 | struct spi_device *spi = data->spi; | |
0ec561f4 DB |
85 | int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR; |
86 | ||
87 | if (data->is_vga) | |
88 | value |= TG_REG0_VQV; | |
89 | ||
90 | tosa_tg_send(spi, TG_PNLCTL, value); | |
fbd1b17b DB |
91 | |
92 | /* TG LCD pannel power up */ | |
93 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
94 | mdelay(50); | |
95 | ||
96 | /* TG LCD GVSS */ | |
97 | tosa_tg_send(spi, TG_PINICTL,0x0); | |
98 | ||
99 | if (!data->i2c) { | |
100 | /* after the pannel is powered up the first time, we can access the i2c bus */ | |
101 | /* so probe for the DAC */ | |
102 | struct i2c_adapter *adap = i2c_get_adapter(0); | |
103 | struct i2c_board_info info = { | |
104 | .type = "tosa-bl", | |
105 | .addr = DAC_BASE, | |
106 | .platform_data = data->spi, | |
107 | }; | |
108 | data->i2c = i2c_new_device(adap, &info); | |
109 | } | |
110 | } | |
111 | ||
112 | static void tosa_lcd_tg_off(struct tosa_lcd_data *data) | |
113 | { | |
114 | struct spi_device *spi = data->spi; | |
115 | ||
116 | /* TG LCD VHSA off */ | |
117 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
118 | mdelay(50); | |
119 | ||
120 | /* TG LCD signal off */ | |
121 | tosa_tg_send(spi, TG_PINICTL,0x6); | |
122 | mdelay(50); | |
123 | ||
124 | /* TG Off */ | |
125 | gpio_set_value(TOSA_GPIO_TG_ON, 1); | |
126 | mdelay(100); | |
127 | } | |
128 | ||
129 | int tosa_lcd_set_power(struct lcd_device *lcd, int power) | |
130 | { | |
131 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
132 | ||
133 | if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power)) | |
134 | tosa_lcd_tg_on(data); | |
135 | ||
136 | if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power)) | |
137 | tosa_lcd_tg_off(data); | |
138 | ||
139 | data->lcd_power = power; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int tosa_lcd_get_power(struct lcd_device *lcd) | |
144 | { | |
145 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
146 | ||
147 | return data->lcd_power; | |
148 | } | |
149 | ||
0ec561f4 DB |
150 | static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) |
151 | { | |
152 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
153 | ||
154 | if (mode->xres == 320 || mode->yres == 320) | |
155 | data->is_vga = false; | |
156 | else | |
157 | data->is_vga = true; | |
158 | ||
159 | if (POWER_IS_ON(data->lcd_power)) | |
160 | tosa_lcd_tg_on(data); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
fbd1b17b DB |
165 | static struct lcd_ops tosa_lcd_ops = { |
166 | .set_power = tosa_lcd_set_power, | |
167 | .get_power = tosa_lcd_get_power, | |
0ec561f4 | 168 | .set_mode = tosa_lcd_set_mode, |
fbd1b17b DB |
169 | }; |
170 | ||
171 | static int __devinit tosa_lcd_probe(struct spi_device *spi) | |
172 | { | |
173 | int ret; | |
174 | struct tosa_lcd_data *data; | |
175 | ||
176 | data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL); | |
177 | if (!data) | |
178 | return -ENOMEM; | |
179 | ||
af901ca1 | 180 | data->is_vga = true; /* default to VGA mode */ |
0ec561f4 | 181 | |
fbd1b17b DB |
182 | /* |
183 | * bits_per_word cannot be configured in platform data | |
184 | */ | |
185 | spi->bits_per_word = 8; | |
186 | ||
187 | ret = spi_setup(spi); | |
188 | if (ret < 0) | |
189 | goto err_spi; | |
190 | ||
191 | data->spi = spi; | |
192 | dev_set_drvdata(&spi->dev, data); | |
193 | ||
194 | ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr"); | |
195 | if (ret < 0) | |
196 | goto err_gpio_tg; | |
197 | ||
198 | mdelay(60); | |
199 | ||
200 | ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0); | |
201 | if (ret < 0) | |
202 | goto err_gpio_dir; | |
203 | ||
204 | mdelay(60); | |
205 | tosa_lcd_tg_init(data); | |
206 | ||
207 | tosa_lcd_tg_on(data); | |
208 | ||
209 | data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data, | |
210 | &tosa_lcd_ops); | |
211 | ||
212 | if (IS_ERR(data->lcd)) { | |
213 | ret = PTR_ERR(data->lcd); | |
214 | data->lcd = NULL; | |
215 | goto err_register; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | ||
220 | err_register: | |
221 | tosa_lcd_tg_off(data); | |
222 | err_gpio_dir: | |
223 | gpio_free(TOSA_GPIO_TG_ON); | |
224 | err_gpio_tg: | |
225 | dev_set_drvdata(&spi->dev, NULL); | |
226 | err_spi: | |
227 | kfree(data); | |
228 | return ret; | |
229 | } | |
230 | ||
231 | static int __devexit tosa_lcd_remove(struct spi_device *spi) | |
232 | { | |
233 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
234 | ||
235 | lcd_device_unregister(data->lcd); | |
236 | ||
237 | if (data->i2c) | |
238 | i2c_unregister_device(data->i2c); | |
239 | ||
240 | tosa_lcd_tg_off(data); | |
241 | ||
242 | gpio_free(TOSA_GPIO_TG_ON); | |
243 | dev_set_drvdata(&spi->dev, NULL); | |
244 | kfree(data); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | #ifdef CONFIG_PM | |
250 | static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state) | |
251 | { | |
252 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
253 | ||
254 | tosa_lcd_tg_off(data); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int tosa_lcd_resume(struct spi_device *spi) | |
260 | { | |
261 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
262 | ||
263 | tosa_lcd_tg_init(data); | |
264 | if (POWER_IS_ON(data->lcd_power)) | |
265 | tosa_lcd_tg_on(data); | |
266 | else | |
267 | tosa_lcd_tg_off(data); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | #else | |
272 | #define tosa_lcd_suspend NULL | |
273 | #define tosa_lcd_reume NULL | |
274 | #endif | |
275 | ||
276 | static struct spi_driver tosa_lcd_driver = { | |
277 | .driver = { | |
278 | .name = "tosa-lcd", | |
279 | .owner = THIS_MODULE, | |
280 | }, | |
281 | .probe = tosa_lcd_probe, | |
282 | .remove = __devexit_p(tosa_lcd_remove), | |
283 | .suspend = tosa_lcd_suspend, | |
284 | .resume = tosa_lcd_resume, | |
285 | }; | |
286 | ||
287 | static int __init tosa_lcd_init(void) | |
288 | { | |
289 | return spi_register_driver(&tosa_lcd_driver); | |
290 | } | |
291 | ||
292 | static void __exit tosa_lcd_exit(void) | |
293 | { | |
294 | spi_unregister_driver(&tosa_lcd_driver); | |
295 | } | |
296 | ||
297 | module_init(tosa_lcd_init); | |
298 | module_exit(tosa_lcd_exit); | |
299 | ||
300 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
301 | MODULE_LICENSE("GPL v2"); | |
302 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
e0626e38 | 303 | MODULE_ALIAS("spi:tosa-lcd"); |