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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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
fbd1b17b DB |
19 | #include <linux/gpio.h> |
20 | #include <linux/delay.h> | |
21 | #include <linux/lcd.h> | |
22 | #include <linux/fb.h> | |
23 | ||
24 | #include <asm/mach/sharpsl_param.h> | |
25 | ||
26 | #include <mach/tosa.h> | |
27 | ||
28 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) | |
29 | ||
30 | #define TG_REG0_VQV 0x0001 | |
31 | #define TG_REG0_COLOR 0x0002 | |
32 | #define TG_REG0_UD 0x0004 | |
33 | #define TG_REG0_LR 0x0008 | |
34 | ||
35 | #define DAC_BASE 0x4e | |
36 | ||
37 | struct tosa_lcd_data { | |
38 | struct spi_device *spi; | |
39 | struct lcd_device *lcd; | |
40 | struct i2c_client *i2c; | |
41 | ||
42 | int lcd_power; | |
0ec561f4 | 43 | bool is_vga; |
fbd1b17b DB |
44 | }; |
45 | ||
46 | static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data) | |
47 | { | |
48 | u8 buf[1]; | |
49 | struct spi_message msg; | |
50 | struct spi_transfer xfer = { | |
51 | .len = 1, | |
52 | .cs_change = 1, | |
53 | .tx_buf = buf, | |
54 | }; | |
55 | ||
56 | buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); | |
57 | spi_message_init(&msg); | |
58 | spi_message_add_tail(&xfer, &msg); | |
59 | ||
60 | return spi_sync(spi, &msg); | |
61 | } | |
62 | ||
63 | int tosa_bl_enable(struct spi_device *spi, int enable) | |
64 | { | |
65 | /* bl_enable GP04=1 otherwise GP04=0*/ | |
66 | return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00); | |
67 | } | |
68 | EXPORT_SYMBOL(tosa_bl_enable); | |
69 | ||
70 | static void tosa_lcd_tg_init(struct tosa_lcd_data *data) | |
71 | { | |
72 | /* TG on */ | |
73 | gpio_set_value(TOSA_GPIO_TG_ON, 0); | |
74 | ||
75 | mdelay(60); | |
76 | ||
77 | /* delayed 0clk TCTL signal for VGA */ | |
78 | tosa_tg_send(data->spi, TG_TPOSCTL, 0x00); | |
79 | /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */ | |
80 | tosa_tg_send(data->spi, TG_GPOSR, 0x02); | |
81 | } | |
82 | ||
83 | static void tosa_lcd_tg_on(struct tosa_lcd_data *data) | |
84 | { | |
85 | struct spi_device *spi = data->spi; | |
0ec561f4 DB |
86 | int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR; |
87 | ||
88 | if (data->is_vga) | |
89 | value |= TG_REG0_VQV; | |
90 | ||
91 | tosa_tg_send(spi, TG_PNLCTL, value); | |
fbd1b17b DB |
92 | |
93 | /* TG LCD pannel power up */ | |
94 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
95 | mdelay(50); | |
96 | ||
97 | /* TG LCD GVSS */ | |
98 | tosa_tg_send(spi, TG_PINICTL,0x0); | |
99 | ||
100 | if (!data->i2c) { | |
101 | /* after the pannel is powered up the first time, we can access the i2c bus */ | |
102 | /* so probe for the DAC */ | |
103 | struct i2c_adapter *adap = i2c_get_adapter(0); | |
104 | struct i2c_board_info info = { | |
105 | .type = "tosa-bl", | |
106 | .addr = DAC_BASE, | |
107 | .platform_data = data->spi, | |
108 | }; | |
109 | data->i2c = i2c_new_device(adap, &info); | |
110 | } | |
111 | } | |
112 | ||
113 | static void tosa_lcd_tg_off(struct tosa_lcd_data *data) | |
114 | { | |
115 | struct spi_device *spi = data->spi; | |
116 | ||
117 | /* TG LCD VHSA off */ | |
118 | tosa_tg_send(spi, TG_PINICTL,0x4); | |
119 | mdelay(50); | |
120 | ||
121 | /* TG LCD signal off */ | |
122 | tosa_tg_send(spi, TG_PINICTL,0x6); | |
123 | mdelay(50); | |
124 | ||
125 | /* TG Off */ | |
126 | gpio_set_value(TOSA_GPIO_TG_ON, 1); | |
127 | mdelay(100); | |
128 | } | |
129 | ||
130 | int tosa_lcd_set_power(struct lcd_device *lcd, int power) | |
131 | { | |
132 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
133 | ||
134 | if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power)) | |
135 | tosa_lcd_tg_on(data); | |
136 | ||
137 | if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power)) | |
138 | tosa_lcd_tg_off(data); | |
139 | ||
140 | data->lcd_power = power; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int tosa_lcd_get_power(struct lcd_device *lcd) | |
145 | { | |
146 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
147 | ||
148 | return data->lcd_power; | |
149 | } | |
150 | ||
0ec561f4 DB |
151 | static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) |
152 | { | |
153 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
154 | ||
155 | if (mode->xres == 320 || mode->yres == 320) | |
156 | data->is_vga = false; | |
157 | else | |
158 | data->is_vga = true; | |
159 | ||
160 | if (POWER_IS_ON(data->lcd_power)) | |
161 | tosa_lcd_tg_on(data); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
fbd1b17b DB |
166 | static struct lcd_ops tosa_lcd_ops = { |
167 | .set_power = tosa_lcd_set_power, | |
168 | .get_power = tosa_lcd_get_power, | |
0ec561f4 | 169 | .set_mode = tosa_lcd_set_mode, |
fbd1b17b DB |
170 | }; |
171 | ||
172 | static int __devinit tosa_lcd_probe(struct spi_device *spi) | |
173 | { | |
174 | int ret; | |
175 | struct tosa_lcd_data *data; | |
176 | ||
c8515294 JH |
177 | data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data), |
178 | GFP_KERNEL); | |
fbd1b17b DB |
179 | if (!data) |
180 | return -ENOMEM; | |
181 | ||
af901ca1 | 182 | data->is_vga = true; /* default to VGA mode */ |
0ec561f4 | 183 | |
fbd1b17b DB |
184 | /* |
185 | * bits_per_word cannot be configured in platform data | |
186 | */ | |
187 | spi->bits_per_word = 8; | |
188 | ||
189 | ret = spi_setup(spi); | |
190 | if (ret < 0) | |
c8515294 | 191 | return ret; |
fbd1b17b DB |
192 | |
193 | data->spi = spi; | |
194 | dev_set_drvdata(&spi->dev, data); | |
195 | ||
402ff9a2 | 196 | ret = devm_gpio_request(&spi->dev, TOSA_GPIO_TG_ON, "tg #pwr"); |
fbd1b17b DB |
197 | if (ret < 0) |
198 | goto err_gpio_tg; | |
199 | ||
200 | mdelay(60); | |
201 | ||
202 | ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0); | |
203 | if (ret < 0) | |
402ff9a2 | 204 | goto err_gpio_tg; |
fbd1b17b DB |
205 | |
206 | mdelay(60); | |
207 | tosa_lcd_tg_init(data); | |
208 | ||
209 | tosa_lcd_tg_on(data); | |
210 | ||
211 | data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data, | |
212 | &tosa_lcd_ops); | |
213 | ||
214 | if (IS_ERR(data->lcd)) { | |
215 | ret = PTR_ERR(data->lcd); | |
216 | data->lcd = NULL; | |
217 | goto err_register; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | ||
222 | err_register: | |
223 | tosa_lcd_tg_off(data); | |
fbd1b17b DB |
224 | err_gpio_tg: |
225 | dev_set_drvdata(&spi->dev, NULL); | |
fbd1b17b DB |
226 | return ret; |
227 | } | |
228 | ||
229 | static int __devexit tosa_lcd_remove(struct spi_device *spi) | |
230 | { | |
231 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
232 | ||
233 | lcd_device_unregister(data->lcd); | |
234 | ||
235 | if (data->i2c) | |
236 | i2c_unregister_device(data->i2c); | |
237 | ||
238 | tosa_lcd_tg_off(data); | |
239 | ||
fbd1b17b | 240 | dev_set_drvdata(&spi->dev, NULL); |
fbd1b17b DB |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
245 | #ifdef CONFIG_PM | |
246 | static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state) | |
247 | { | |
248 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
249 | ||
250 | tosa_lcd_tg_off(data); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int tosa_lcd_resume(struct spi_device *spi) | |
256 | { | |
257 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
258 | ||
259 | tosa_lcd_tg_init(data); | |
260 | if (POWER_IS_ON(data->lcd_power)) | |
261 | tosa_lcd_tg_on(data); | |
262 | else | |
263 | tosa_lcd_tg_off(data); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | #else | |
268 | #define tosa_lcd_suspend NULL | |
8da00edc | 269 | #define tosa_lcd_resume NULL |
fbd1b17b DB |
270 | #endif |
271 | ||
272 | static struct spi_driver tosa_lcd_driver = { | |
273 | .driver = { | |
274 | .name = "tosa-lcd", | |
275 | .owner = THIS_MODULE, | |
276 | }, | |
277 | .probe = tosa_lcd_probe, | |
278 | .remove = __devexit_p(tosa_lcd_remove), | |
279 | .suspend = tosa_lcd_suspend, | |
280 | .resume = tosa_lcd_resume, | |
281 | }; | |
282 | ||
462dd838 | 283 | module_spi_driver(tosa_lcd_driver); |
fbd1b17b DB |
284 | |
285 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
286 | MODULE_LICENSE("GPL v2"); | |
287 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
e0626e38 | 288 | MODULE_ALIAS("spi:tosa-lcd"); |