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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; | |
42 | }; | |
43 | ||
44 | static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data) | |
45 | { | |
46 | u8 buf[1]; | |
47 | struct spi_message msg; | |
48 | struct spi_transfer xfer = { | |
49 | .len = 1, | |
50 | .cs_change = 1, | |
51 | .tx_buf = buf, | |
52 | }; | |
53 | ||
54 | buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); | |
55 | spi_message_init(&msg); | |
56 | spi_message_add_tail(&xfer, &msg); | |
57 | ||
58 | return spi_sync(spi, &msg); | |
59 | } | |
60 | ||
61 | int tosa_bl_enable(struct spi_device *spi, int enable) | |
62 | { | |
63 | /* bl_enable GP04=1 otherwise GP04=0*/ | |
64 | return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00); | |
65 | } | |
66 | EXPORT_SYMBOL(tosa_bl_enable); | |
67 | ||
68 | static void tosa_lcd_tg_init(struct tosa_lcd_data *data) | |
69 | { | |
70 | /* TG on */ | |
71 | gpio_set_value(TOSA_GPIO_TG_ON, 0); | |
72 | ||
73 | mdelay(60); | |
74 | ||
75 | /* delayed 0clk TCTL signal for VGA */ | |
76 | tosa_tg_send(data->spi, TG_TPOSCTL, 0x00); | |
77 | /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */ | |
78 | tosa_tg_send(data->spi, TG_GPOSR, 0x02); | |
79 | } | |
80 | ||
81 | static void tosa_lcd_tg_on(struct tosa_lcd_data *data) | |
82 | { | |
83 | struct spi_device *spi = data->spi; | |
84 | const int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR; | |
85 | tosa_tg_send(spi, TG_PNLCTL, value | TG_REG0_VQV); /* this depends on mode */ | |
86 | ||
87 | /* TG LCD pannel power up */ | |
88 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
89 | mdelay(50); | |
90 | ||
91 | /* TG LCD GVSS */ | |
92 | tosa_tg_send(spi, TG_PINICTL,0x0); | |
93 | ||
94 | if (!data->i2c) { | |
95 | /* after the pannel is powered up the first time, we can access the i2c bus */ | |
96 | /* so probe for the DAC */ | |
97 | struct i2c_adapter *adap = i2c_get_adapter(0); | |
98 | struct i2c_board_info info = { | |
99 | .type = "tosa-bl", | |
100 | .addr = DAC_BASE, | |
101 | .platform_data = data->spi, | |
102 | }; | |
103 | data->i2c = i2c_new_device(adap, &info); | |
104 | } | |
105 | } | |
106 | ||
107 | static void tosa_lcd_tg_off(struct tosa_lcd_data *data) | |
108 | { | |
109 | struct spi_device *spi = data->spi; | |
110 | ||
111 | /* TG LCD VHSA off */ | |
112 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
113 | mdelay(50); | |
114 | ||
115 | /* TG LCD signal off */ | |
116 | tosa_tg_send(spi, TG_PINICTL,0x6); | |
117 | mdelay(50); | |
118 | ||
119 | /* TG Off */ | |
120 | gpio_set_value(TOSA_GPIO_TG_ON, 1); | |
121 | mdelay(100); | |
122 | } | |
123 | ||
124 | int tosa_lcd_set_power(struct lcd_device *lcd, int power) | |
125 | { | |
126 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
127 | ||
128 | if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power)) | |
129 | tosa_lcd_tg_on(data); | |
130 | ||
131 | if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power)) | |
132 | tosa_lcd_tg_off(data); | |
133 | ||
134 | data->lcd_power = power; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int tosa_lcd_get_power(struct lcd_device *lcd) | |
139 | { | |
140 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
141 | ||
142 | return data->lcd_power; | |
143 | } | |
144 | ||
145 | static struct lcd_ops tosa_lcd_ops = { | |
146 | .set_power = tosa_lcd_set_power, | |
147 | .get_power = tosa_lcd_get_power, | |
148 | }; | |
149 | ||
150 | static int __devinit tosa_lcd_probe(struct spi_device *spi) | |
151 | { | |
152 | int ret; | |
153 | struct tosa_lcd_data *data; | |
154 | ||
155 | data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL); | |
156 | if (!data) | |
157 | return -ENOMEM; | |
158 | ||
159 | /* | |
160 | * bits_per_word cannot be configured in platform data | |
161 | */ | |
162 | spi->bits_per_word = 8; | |
163 | ||
164 | ret = spi_setup(spi); | |
165 | if (ret < 0) | |
166 | goto err_spi; | |
167 | ||
168 | data->spi = spi; | |
169 | dev_set_drvdata(&spi->dev, data); | |
170 | ||
171 | ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr"); | |
172 | if (ret < 0) | |
173 | goto err_gpio_tg; | |
174 | ||
175 | mdelay(60); | |
176 | ||
177 | ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0); | |
178 | if (ret < 0) | |
179 | goto err_gpio_dir; | |
180 | ||
181 | mdelay(60); | |
182 | tosa_lcd_tg_init(data); | |
183 | ||
184 | tosa_lcd_tg_on(data); | |
185 | ||
186 | data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data, | |
187 | &tosa_lcd_ops); | |
188 | ||
189 | if (IS_ERR(data->lcd)) { | |
190 | ret = PTR_ERR(data->lcd); | |
191 | data->lcd = NULL; | |
192 | goto err_register; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | ||
197 | err_register: | |
198 | tosa_lcd_tg_off(data); | |
199 | err_gpio_dir: | |
200 | gpio_free(TOSA_GPIO_TG_ON); | |
201 | err_gpio_tg: | |
202 | dev_set_drvdata(&spi->dev, NULL); | |
203 | err_spi: | |
204 | kfree(data); | |
205 | return ret; | |
206 | } | |
207 | ||
208 | static int __devexit tosa_lcd_remove(struct spi_device *spi) | |
209 | { | |
210 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
211 | ||
212 | lcd_device_unregister(data->lcd); | |
213 | ||
214 | if (data->i2c) | |
215 | i2c_unregister_device(data->i2c); | |
216 | ||
217 | tosa_lcd_tg_off(data); | |
218 | ||
219 | gpio_free(TOSA_GPIO_TG_ON); | |
220 | dev_set_drvdata(&spi->dev, NULL); | |
221 | kfree(data); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_PM | |
227 | static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state) | |
228 | { | |
229 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
230 | ||
231 | tosa_lcd_tg_off(data); | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static int tosa_lcd_resume(struct spi_device *spi) | |
237 | { | |
238 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
239 | ||
240 | tosa_lcd_tg_init(data); | |
241 | if (POWER_IS_ON(data->lcd_power)) | |
242 | tosa_lcd_tg_on(data); | |
243 | else | |
244 | tosa_lcd_tg_off(data); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | #else | |
249 | #define tosa_lcd_suspend NULL | |
250 | #define tosa_lcd_reume NULL | |
251 | #endif | |
252 | ||
253 | static struct spi_driver tosa_lcd_driver = { | |
254 | .driver = { | |
255 | .name = "tosa-lcd", | |
256 | .owner = THIS_MODULE, | |
257 | }, | |
258 | .probe = tosa_lcd_probe, | |
259 | .remove = __devexit_p(tosa_lcd_remove), | |
260 | .suspend = tosa_lcd_suspend, | |
261 | .resume = tosa_lcd_resume, | |
262 | }; | |
263 | ||
264 | static int __init tosa_lcd_init(void) | |
265 | { | |
266 | return spi_register_driver(&tosa_lcd_driver); | |
267 | } | |
268 | ||
269 | static void __exit tosa_lcd_exit(void) | |
270 | { | |
271 | spi_unregister_driver(&tosa_lcd_driver); | |
272 | } | |
273 | ||
274 | module_init(tosa_lcd_init); | |
275 | module_exit(tosa_lcd_exit); | |
276 | ||
277 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
278 | MODULE_LICENSE("GPL v2"); | |
279 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
280 |